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CN116054233A - Switching control method of grid-structured inverter with phase supporting capability under fault - Google Patents

Switching control method of grid-structured inverter with phase supporting capability under fault Download PDF

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Publication number
CN116054233A
CN116054233A CN202211381836.1A CN202211381836A CN116054233A CN 116054233 A CN116054233 A CN 116054233A CN 202211381836 A CN202211381836 A CN 202211381836A CN 116054233 A CN116054233 A CN 116054233A
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China
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grid
phase
current
phase inverter
amplitude
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Inventor
吴峰
鲍颜红
徐泰山
郑建勇
张金龙
任先成
梅飞
李恺
梅军
王彬
郭家炜
姜薇
杜翔飞
杨可昕
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Southeast University
NARI Group Corp
Nari Technology Co Ltd
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Southeast University
NARI Group Corp
Nari Technology Co Ltd
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Priority to CN202211381836.1A priority Critical patent/CN116054233A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/48—Controlling the sharing of the in-phase component
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]

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  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The invention discloses a switching control method of a grid-structured inverter with phase supporting capability under faults, wherein the grid-structured inverter normally works in a voltage source control mode, when the current under the faults is detected to be over-limited, an angular velocity compensation control link based on the phase change of a power grid is input, the actual phase difference between the potential phase in the output of the inverter and the power grid is reduced, and the phase supporting capability is provided. And a PI control link is introduced in the current amplitude limiting control module, so that the situation that the internal potential amplitude is severely changed due to current amplitude limiting under faults is improved. The smooth switching of the voltage source control mode and the current source control mode is realized through the internal potential phase and the amplitude control under the fault, the problems that the synchronous supporting capacity is insufficient during the fault period of the grid-connected inverter, the impact of the resynchronization process after the fault is large and the transient instability is easy are overcome, the stability of the grid-connected new energy power generation equipment is improved, and the method has good application value.

Description

Switching control method of grid-structured inverter with phase supporting capability under fault
Technical Field
The invention relates to a switching control method of a grid-built inverter with phase supporting capability under faults, and belongs to the technical field of new energy power generation.
Background
In recent years, with the wide access of large-scale new energy sources, the traditional synchronous machine is increasingly replaced by a new energy source converter, and the grid-structured inverter is also widely mentioned and researched. The grid-formed inverter can provide stable voltage and phase support and has functions and effects similar to those of a conventional synchronous generator. Direct voltage control is believed to provide a strong voltage and phase support capability without regard to current violations.
However, because the voltage-resistant and current-resistant capability of the power electronic device is poor, the grid-connected inverter bearing the networking task can face the problem of over-current during a more serious fault under a direct voltage control structure, the prior art proposes a direct voltage control method based on current limiting control, but the current limiting control leads the amplitude of internal potential to be changed severely, and the stability of grid-connected equipment is weakened.
In addition, the voltage-current double-closed-loop structure can effectively limit the output current of the inverter during faults, but the response of the double-closed-loop structure is slower than that of direct voltage control, and the current-limiting period is switched to a current source mode based on phase-locked control, so that stable synchronous phase supporting capability cannot be provided, and the problems of overlarge impact and easy transient instability in a resynchronization process caused by continuous increase of the power grid phase and the output phase of the inverter during faults are also faced.
Therefore, those skilled in the art are highly required to solve the problems of insufficient inverter phase support capability during a fault and smooth switching of the voltage source mode and the current source mode after the fault.
Disclosure of Invention
The purpose is as follows: in order to solve the problems that the supporting capacity of a grid-structured inverter is insufficient during the fault period and the current impact is large in the resynchronization process after the fault and transient instability is easy to occur in the prior art, the invention provides a switching control method of the grid-structured inverter with the phase supporting capacity under the fault, and the transient stability of new energy grid-connected equipment is improved.
The technical scheme is as follows: in order to solve the technical problems, the invention adopts the following technical scheme:
in a first aspect, a method for switching control of a grid-formed inverter with phase support capability under fault includes the steps of:
step 1: and acquiring the alternating voltage and alternating current of the grid-connected point of the three-phase inverter, and performing Park conversion on the alternating voltage and alternating current of the grid-connected point to obtain the alternating voltage value and the alternating current value of the grid-connected point of the corresponding physical quantity under the dq coordinate system.
Step 2: calculating the active power P of the alternating current side of the three-phase inverter according to the alternating current voltage value and the alternating current value of the grid-connected point under the dq coordinate system e And reactive power Q e 。
Step 3: calculating the phase theta of the power grid voltage according to the three-phase voltage of the power grid side g Grid voltage amplitude V g 。
Step 4: according to the given active power command value P of the three-phase inverter ref Rated angular frequency omega of power grid ref The obtained grid voltage phase theta g Outputting a signal T in the current out-of-limit link calculated in the step 6 at the previous moment LIM The three-phase inverter outputs active power P e Calculating the potential phase θ in a three-phase inverter VSG 。
Step 5: according to the reactive power command value Q given by the three-phase inverter ref Reference value E of the grid voltage amplitude 0 The three-phase inverter outputs active power Q e The magnitude E of the potential in the three-phase inverter is calculated.
Step 6: according to the amplitude E of the internal potential of the three-phase inverter, the filter inductance L and the current amplitude limiting value I of the three-phase inverter max Grid voltage amplitude V g AC current I of the parallel network g Virtual rotor angular velocity omega VSG AC voltage value and AC current value of the grid-connected point under dq coordinate system, calculating amplitude limiting three-phase inverter internal potential amplitude E' and outputting signal T in current out-of-limit link LIM 。
Step 7: according to amplitude E' of electric potential in three-phase inverter after amplitude limitation, phase theta of electric potential in three-phase inverter VSG At θ VSG Performing Park inverse transformation as a rotation angle to obtain a three-phase inverter modulation wave, and comparing the three-phase inverter modulation wave with a carrier signal V m Modulation is performed to generate a switching control signal D for controlling the three-phase inverter.
Preferably, the step 4 specifically comprises the following steps:
step 4.1: outputting active power P from three-phase inverter e Active power command value P given by three-phase inverter ref Rated angular frequency omega of power grid ref Inputting the rotor motion equation to obtain the virtual rotor angular velocity omega V 。
Step 4.2: outputting a signal T according to the current out-of-limit link calculated in the previous time step 6 LIM Acquiring an angular velocity compensation command omega com Virtual rotor angular velocity ω V With angular velocity compensation command omega com After addition, the virtual rotor angular velocity omega compensated at the current moment is obtained VSG 。
Step 4.3: compensating the current moment to obtain the virtual rotor angular velocity omega VSG Obtaining the potential phase theta in the three-phase inverter through an integration link VSG 。
Preferably, the angular velocity compensation command ω com The acquisition method comprises the following steps:
step 4.2.1: outputting active power P from a known three-phase inverter e Angular velocity omega after compensation at last moment VSG Ac voltage V of grid-connected point g AC current I of the parallel network g Substituting the filter inductance L into the formula 1, and calculating to obtain the control phase theta of the grid-connected point of the three-phase inverter gc 。
The formula 1 is calculated as follows:
Figure BDA0003927222240000031
step 4.2.2: phase θ of the grid voltage g And theta gc After the difference is made, the angular velocity compensation instruction omega is obtained through PI control com 。
Step 4.2.3: outputting a signal T in the current out-of-limit link calculated in the step 6 at the previous moment LIM When=1, an angular velocity compensation command ω is output com Otherwise, outputting an angular velocity compensation command omega com Is 0.
As a preferable scheme, the calculation formula of the potential amplitude E in the three-phase inverter is as follows:
Figure BDA0003927222240000032
wherein ,Kq And s is a Laplacian operator and is a reactive integration coefficient.
Preferably, the step 6 specifically comprises the following steps:
step 6.1: the known potential amplitude E, the filter inductance L and the virtual rotor angular velocity omega after the current time compensation in the three-phase inverter VSG Substituting the alternating voltage value and the alternating current value of the grid-connected point under the dq coordinate system into formula 3, and calculating to obtain d and q axis components of the output current reference value of the three-phase inverter
Figure BDA0003927222240000033
and
Figure BDA0003927222240000034
The formula 3 is calculated as follows:
Figure BDA0003927222240000035
wherein ,isd and isq D-axis component and q-axis component of alternating current of grid-connected point respectively, u sd and usq The d-axis component and the q-axis component of the grid-connected point alternating current voltage are adopted, and alpha is the closed loop expected bandwidth of current control and can be set manually.
Step 6.2: outputting d-axis and q-axis components of current reference values to a three-phase inverter
Figure BDA0003927222240000036
and
Figure BDA0003927222240000037
Clipping is performed to obtain the d and q axis components of the current after clipping>
Figure BDA0003927222240000038
and
Figure BDA0003927222240000039
Current d, q-axis component
Figure BDA00039272222400000310
and
Figure BDA00039272222400000311
The calculation formula is as follows:
Figure BDA00039272222400000312
wherein ,
Figure BDA00039272222400000313
the current phase angle is set manually, and the value range is 0-90 degrees. I max The current limiting value is three-phase inverter. Representing a short-term over-leveling of the three-phase inverter that can be maximally tolerated, typically 1.3pu.
Step 6.3: based on the d-and q-axis components of the limited current
Figure BDA0003927222240000041
and
Figure BDA0003927222240000042
The d-axis and q-axis components of the internal potential amplitude are calculated.
Internal potential amplitude d-axis, q-axis component u cd and ucq The calculation formula is as follows:
Figure BDA0003927222240000043
wherein ,Hd (s) is d-axis PI control link, H q And(s) is a q-axis PI control link, and s is a Laplacian operator. α is the closed loop desired bandwidth of the current control, which can be set manually.
Step 6.4: will beInternal potential amplitude d, q-axis component u cd and ucq And synthesizing to obtain the amplitude E' of the potential in the three-phase inverter after amplitude limiting.
Step 6.5: judging
Figure BDA0003927222240000044
And I max Size, when->
Figure BDA0003927222240000045
When the current is over the limit, a signal T is output LIM 1, otherwise, outputting a signal T in the current out-of-limit link at the current moment LIM Is 0.
As a preferred embodiment of the present invention,
Figure BDA0003927222240000046
the ratio coefficient values of the d and q axes of the PI control are as follows: k (k) pd ＝1，k pq =1; the PI control d and q axis integral coefficient value ranges are as follows: k is 0 < k id ≤5，0＜k iq The specific value is less than or equal to 0.1 and is determined according to the simulation experiment result. s is the Laplace operator.
In a second aspect, a switching control device for a grid-formed inverter with phase support capability under fault includes:
the voltage and current measuring module is used for: the method is used for obtaining the alternating voltage and the alternating current of the grid-connected point of the three-phase inverter, performing Park conversion on the alternating voltage and the alternating current of the grid-connected point, and obtaining the alternating voltage value and the alternating current value of the grid-connected point of the corresponding physical quantity under the dq coordinate system.
And a power calculation module: calculating the active power P of the alternating current side of the three-phase inverter according to the alternating current voltage value and the alternating current value of the grid-connected point under the dq coordinate system e And reactive power Q e 。
PLL phase lock module: for calculating the phase theta of the grid voltage from the three-phase voltage of the grid side g Grid voltage amplitude V g 。
An internal potential phase generation module: for setting the active power command value according to a three-phase inverterP ref Rated angular frequency omega of power grid ref The obtained grid voltage phase theta g The current out-of-limit link output signal T calculated by the potential amplitude limiting module in the last moment LIM The three-phase inverter outputs active power P e Calculating the potential phase θ in a three-phase inverter VSG 。
An internal potential amplitude generation module: for setting reactive power command value Q according to three-phase inverter ref Reference value E of the grid voltage amplitude 0 The three-phase inverter outputs active power Q e The magnitude E of the potential in the three-phase inverter is calculated.
An internal potential amplitude limiting module: for determining the amplitude E of the internal potential of the three-phase inverter, the filter inductance L and the current limiting value I of the three-phase inverter max Grid voltage amplitude V g AC current I of the parallel network g Virtual rotor angular velocity omega VSG AC voltage value and AC current value of the grid-connected point under dq coordinate system, calculating amplitude limiting three-phase inverter internal potential amplitude E' and outputting signal T in current out-of-limit link LIM 。
And a modulation module: for determining the phase θ of the electric potential in the three-phase inverter according to the amplitude E' of the electric potential in the three-phase inverter after amplitude limiting VSG At θ VSG Performing Park inverse transformation as a rotation angle to obtain a three-phase inverter modulation wave, and comparing the three-phase inverter modulation wave with a carrier signal V m Modulation is performed to generate a switching control signal D for controlling the three-phase inverter.
As a preferred scheme, the internal potential phase generating module has the following specific functions:
step 4.1: outputting active power P from three-phase inverter e Active power command value P given by three-phase inverter ref Rated angular frequency omega of power grid ref Inputting the rotor motion equation to obtain the virtual rotor angular velocity omega V 。
Step 4.2: outputting a signal T according to the current out-of-limit link calculated by the potential amplitude limiting module in the last moment LIM Acquiring an angular velocity compensation command omega com Virtual rotor angular velocity ω V And angular velocityCompensation command omega com After addition, the virtual rotor angular velocity omega compensated at the current moment is obtained VSG 。
Step 4.3: compensating the current moment to obtain the virtual rotor angular velocity omega VSG Obtaining the potential phase theta in the three-phase inverter through an integration link VSG 。
Preferably, the angular velocity compensation command ω com The acquisition method comprises the following steps:
step 4.2.1: outputting active power P from a known three-phase inverter e Angular velocity omega after compensation at last moment VSG Ac voltage V of grid-connected point g AC current I of the parallel network g Substituting the filter inductance L into the formula 1, and calculating to obtain the control phase theta of the grid-connected point of the three-phase inverter gc 。
The formula 1 is calculated as follows:
Figure BDA0003927222240000051
step 4.2.2: phase θ of the grid voltage g And theta gc After the difference is made, the angular velocity compensation instruction omega is obtained through PI control com 。
Step 4.2.3: when the current out-of-limit link calculated by the potential amplitude limiting module in the last moment outputs a signal T LIM When=1, an angular velocity compensation command ω is output com Otherwise, outputting an angular velocity compensation command omega com Is 0.
As a preferable scheme, the calculation formula of the potential amplitude E in the three-phase inverter is as follows:
Figure BDA0003927222240000061
wherein ,Kq And s is a Laplacian operator and is a reactive integration coefficient.
As a preferred scheme, the internal potential amplitude limiting module has the following specific functions:
step 6.1: to be known as three phasesPotential amplitude E, filter inductance L in inverter and virtual rotor angular velocity omega compensated at current moment VSG Substituting the alternating voltage value and the alternating current value of the grid-connected point under the dq coordinate system into a formula 3, and calculating to obtain d and q axis components i of the output current reference value of the three-phase inverter s * d and is * q 。
The formula 3 is calculated as follows:
Figure BDA0003927222240000062
wherein ,isd and isq D-axis component and q-axis component of alternating current of grid-connected point respectively, u sd and usq The d-axis component and the q-axis component of the grid-connected point alternating current voltage are adopted, and alpha is the closed loop expected bandwidth of current control and can be set manually.
Step 6.2: outputting d-axis and q-axis components of current reference values to a three-phase inverter
Figure BDA0003927222240000063
and
Figure BDA0003927222240000064
Clipping is performed to obtain the d and q axis components of the current after clipping>
Figure BDA0003927222240000065
and
Figure BDA0003927222240000066
Current d, q-axis component
Figure BDA0003927222240000067
and
Figure BDA0003927222240000068
The calculation formula is as follows:
Figure BDA0003927222240000069
wherein ,
Figure BDA00039272222400000610
the current phase angle is set manually, and the value range is 0-90 degrees. I max The current limiting value is three-phase inverter. Representing a short-term over-leveling of the three-phase inverter that can be maximally tolerated, typically 1.3pu.
Step 6.3: based on the d-and q-axis components of the limited current
Figure BDA00039272222400000611
and
Figure BDA00039272222400000612
The d-axis and q-axis components of the internal potential amplitude are calculated.
Internal potential amplitude d-axis, q-axis component u cd and ucq The calculation formula is as follows:
Figure BDA0003927222240000071
wherein ,Hd (s) is d-axis PI control link, H q And(s) is a q-axis PI control link, and s is a Laplacian operator. α is the closed loop desired bandwidth of the current control, which can be set manually.
Step 6.4: the internal potential amplitude d, q-axis component u cd and ucq And synthesizing to obtain the amplitude E' of the potential in the three-phase inverter after amplitude limiting.
Step 6.5: judging
Figure BDA0003927222240000072
And I max Size, when->
Figure BDA0003927222240000073
When the current is over the limit, a signal T is output LIM 1, otherwise, outputting a signal T in the current out-of-limit link at the current moment LIM Is 0.
As a best effortIn the alternative to this, the process is carried out,
Figure BDA0003927222240000074
the ratio coefficient values of the d and q axes of the PI control are as follows: k (k) pd ＝1，k pq =1; the PI control d and q axis integral coefficient value ranges are as follows: k is 0 < k id ≤5，0＜k iq The specific value is less than or equal to 0.1 and is determined according to the simulation experiment result. s is the Laplace operator.
The beneficial effects are that: according to the switching control method for the grid-structured inverter with the phase support capability under the fault, the grid-structured inverter normally works in a voltage source control mode, when the current under the fault is detected to be over-limited, an angular velocity compensation control link based on the phase change of the power grid is input, the actual phase difference between the potential phase in the output of the inverter and the power grid is reduced, and the phase support capability is provided. And a PI control link is introduced in the current amplitude limiting control module, so that the situation that the internal potential amplitude is severely changed due to current amplitude limiting under faults is improved. The smooth switching of the voltage source control mode and the current source control mode is realized through the internal potential phase and the amplitude control under the fault, the problems that the synchronous supporting capacity is insufficient during the fault period of the grid-connected inverter, the impact of the resynchronization process after the fault is large and the transient instability is easy are overcome, the stability of the grid-connected new energy power generation equipment is improved, and the method has good application value.
Compared with the prior art, the invention has the following beneficial effects for the new energy power generation system:
1. the grid-structured inverter controlled by the method can limit the fault current of the grid-structured inverter and the impact current in the resynchronization process during the power grid fault period and the fault recovery process, and simultaneously track the power grid phase change to improve the transient stability of the grid-structured inverter.
2. The grid-structured inverter controlled by the method can provide phase support capability during the power grid fault period, provide stable phase support for other types of inverters in the power grid, such as the grid-following inverter widely used at present under normal and fault working conditions, and improve the control performance and transient stability of the grid-following inverter. Compared with the existing grid-structured inverter which can only provide the phase supporting capacity under the normal working condition, the improvement of the phase supporting capacity under the fault is more needed by the power grid.
Drawings
Fig. 1 is a schematic diagram of a switching control system of a grid-structured inverter with a phase supporting capability under fault according to the present invention.
Fig. 2 is a schematic structural diagram of a switching control device of a grid-structured inverter with a phase supporting capability under fault according to the present invention.
Fig. 3 is a control block diagram of a method of generating potential phases in a grid-built inverter with phase support capability under fault of the present invention.
Detailed Description
The invention will be further described with reference to specific examples.
As shown in fig. 1, a switching control system of a grid-structured inverter with a phase supporting capability under fault in a first embodiment includes a dc power supply, which is integrated into a power grid after passing through a main circuit of a three-phase inverter and a filter inductor, a voltage and current measuring module connected to a grid connection point between the filter inductor and the power grid, a PLL phase locking module connected to the voltage and current measuring module, and a controller connected to the main circuit of the three-phase inverter.
The voltage and current measuring module is used for measuring and sampling the grid-connected point alternating voltage and the grid-connected point alternating current of the three-phase inverter.
The PLL phase locking module is used for calculating the power grid voltage phase according to the power grid side three-phase voltage.
The controller executes a switching control method of the grid-formed inverter having a phase supporting capability under a fault for generating a switching control signal for controlling the grid-formed inverter.
The internal potential refers to the potential of a connecting node between the three-phase inverter and the filter inductor, and comprises the amplitude and the phase of the potential.
A second embodiment is a switching control method of a grid-built inverter with a phase supporting capability under fault, including the steps of:
step 1: and acquiring the alternating voltage and alternating current of the grid-connected point of the three-phase inverter, and performing Park conversion on the alternating voltage and alternating current of the grid-connected point to obtain the alternating voltage value and the alternating current value of the grid-connected point of the corresponding physical quantity under the dq coordinate system.
Step 2: calculating the active power P of the alternating current side of the three-phase inverter according to the alternating current voltage value and the alternating current value of the grid-connected point under the dq coordinate system e And reactive power Q e 。
Step 3: calculating the phase theta of the power grid voltage according to the three-phase voltage of the power grid side g Grid voltage amplitude V g 。
Step 4: according to the given active power command value P of the three-phase inverter ref Rated angular frequency omega of power grid ref The obtained grid voltage phase theta g Outputting a signal T in the current out-of-limit link calculated in the step 6 at the previous moment LIM The three-phase inverter outputs active power P e Calculating the potential phase θ in a three-phase inverter VSG 。
Step 5: according to the reactive power command value Q given by the three-phase inverter ref Reference value E of the grid voltage amplitude 0 The three-phase inverter outputs active power Q e The magnitude E of the potential in the three-phase inverter is calculated.
Step 6: according to the amplitude E of the internal potential of the three-phase inverter, the filter inductance L and the current amplitude limiting value I of the three-phase inverter max Grid voltage amplitude V g AC current I of the parallel network g Virtual rotor angular velocity omega VSG AC voltage value and AC current value of the grid-connected point under dq coordinate system, calculating amplitude limiting three-phase inverter internal potential amplitude E' and outputting signal T in current out-of-limit link LIM 。
Step 7: according to amplitude E' of electric potential in three-phase inverter after amplitude limitation, phase theta of electric potential in three-phase inverter VSG At θ VSG Performing Park inverse transformation as a rotation angle to obtain a three-phase inverter modulation wave, and comparing the three-phase inverter modulation wave with a carrier signal V m Modulation is performed to generate a switching control signal D for controlling the three-phase inverter.
Further, the step 4 specifically includes the following steps:
step 4.1: outputting active power P from three-phase inverter e Active power command value P given by three-phase inverter ref Rated angular frequency omega of power grid ref Inputting the rotor motion equation to obtain the virtual rotor angular velocity omega V 。
Step 4.2: outputting a signal T according to the current out-of-limit link calculated in the previous time step 6 LIM Acquiring an angular velocity compensation command omega com Virtual rotor angular velocity ω V With angular velocity compensation command omega com After addition, the virtual rotor angular velocity omega compensated at the current moment is obtained VSG 。
Step 4.3: compensating the current moment to obtain the virtual rotor angular velocity omega VSG Obtaining the potential phase theta in the three-phase inverter through an integration link VSG 。
Further, the angular velocity compensation command omega com The acquisition method comprises the following steps:
step 4.2.1: outputting active power P from a known three-phase inverter e Angular velocity omega after compensation at last moment VSG Ac voltage V of grid-connected point g AC current I of the parallel network g Substituting the filter inductance L into the formula 1, and calculating to obtain the control phase theta of the grid-connected point of the three-phase inverter gc 。
The formula 1 is calculated as follows:
Figure BDA0003927222240000091
step 4.2.2: phase θ of the grid voltage g And theta gc After the difference is made, the angular velocity compensation instruction omega is obtained through PI control com 。
Step 4.2.3: outputting a signal T in the current out-of-limit link calculated in the step 6 at the previous moment LIM When=1, an angular velocity compensation command ω is output com Otherwise, outputting an angular velocity compensation command omega com Is 0.
The angular velocity compensation control link is thrown when the current is out of limit, and the phase change of the power grid can be tracked while the rotor motion equation link is maintained, so that the method has the advantages that:
1) Since the rotor motion equation is maintained, a certain phase support capability is provided when the current is over-limited (i.e. during power grid faults), and other grid-following inverters can be prevented from transient instability.
2) Because the three-phase inverter tracks the phase change of the power grid, the phase difference between the output phase of the three-phase inverter and the power grid during the fault recovery resynchronization is reduced, and the impact current during the resynchronization process is reduced.
Further, the calculation formula of the potential amplitude E in the three-phase inverter is as follows:
Figure BDA0003927222240000101
wherein ,Kq And s is a Laplacian operator and is a reactive integration coefficient.
Further, the step 6 specifically includes the following steps:
step 6.1: the known potential amplitude E, the filter inductance L and the virtual rotor angular velocity omega after the current time compensation in the three-phase inverter VSG Substituting the alternating voltage value and the alternating current value of the grid-connected point under the dq coordinate system into formula 3, and calculating to obtain d and q axis components of the output current reference value of the three-phase inverter
Figure BDA0003927222240000102
and
Figure BDA0003927222240000103
The formula 3 is calculated as follows:
Figure BDA0003927222240000104
wherein ,isd and isq D-axis component and q-axis component of alternating current of grid-connected point respectively, u sd and usq For the d-axis component and the q-axis component of the grid-connected point alternating voltage, alpha isThe closed loop desired bandwidth of the current control can be set manually.
Step 6.2: outputting d-axis and q-axis components of current reference values to a three-phase inverter
Figure BDA0003927222240000105
and
Figure BDA0003927222240000106
Clipping is performed to obtain the d and q axis components of the current after clipping>
Figure BDA0003927222240000107
and
Figure BDA0003927222240000108
Current d, q-axis component
Figure BDA0003927222240000109
and
Figure BDA00039272222400001010
The calculation formula is as follows:
Figure BDA0003927222240000111
wherein ,
Figure BDA0003927222240000112
the current phase angle is set manually, and the value range is 0-90 degrees. I max The current limiting value is three-phase inverter. Representing a short-term over-leveling of the three-phase inverter that can be maximally tolerated, typically 1.3pu.
Step 6.3: based on the d-and q-axis components of the limited current
Figure BDA0003927222240000113
and
Figure BDA0003927222240000114
Calculating d-axis and q-axis of internal potential amplitudeAn axis component.
Internal potential amplitude d-axis, q-axis component u cd and ucq The calculation formula is as follows:
Figure BDA0003927222240000115
wherein ,Hd (s) is d-axis PI control link, H q And(s) is a q-axis PI control link, and s is a Laplacian operator. α is the closed loop desired bandwidth of the current control, which can be set manually.
Step 6.4: the internal potential amplitude d, q-axis component u cd and ucq And synthesizing to obtain the amplitude E' of the potential in the three-phase inverter after amplitude limiting.
Step 6.5: judging
Figure BDA0003927222240000116
And I max Size, when->
Figure BDA0003927222240000117
When the current is over the limit, a signal T is output LIM 1, otherwise, outputting a signal T in the current out-of-limit link at the current moment LIM Is 0.
Further, the method comprises the steps of,
Figure BDA0003927222240000118
the ratio coefficient values of the d and q axes of the PI control are as follows: k (k) pd ＝1，k pq =1; the PI control d and q axis integral coefficient value ranges are as follows: k is 0 < k id ≤5，0＜k iq The specific value is less than or equal to 0.1 and is determined according to the simulation experiment result. s is the Laplace operator.
As shown in fig. 2, a third embodiment of a switching control device for a grid-structured inverter with a phase-under-fault supporting capability includes the following modules:
the voltage and current measuring module is used for: the method is used for obtaining the alternating voltage and the alternating current of the grid-connected point of the three-phase inverter, performing Park conversion on the alternating voltage and the alternating current of the grid-connected point, and obtaining the alternating voltage value and the alternating current value of the grid-connected point of the corresponding physical quantity under the dq coordinate system.
And a power calculation module: calculating the active power P of the alternating current side of the three-phase inverter according to the alternating current voltage value and the alternating current value of the grid-connected point under the dq coordinate system e And reactive power Q e 。
PLL phase lock module: for calculating the phase theta of the grid voltage from the three-phase voltage of the grid side g Grid voltage amplitude V g 。
An internal potential phase generation module: for setting the active power command value P according to a three-phase inverter ref Rated angular frequency omega of power grid ref The obtained grid voltage phase theta g The current out-of-limit link output signal T calculated by the potential amplitude limiting module in the last moment LIM The three-phase inverter outputs active power P e Calculating the potential phase θ in a three-phase inverter VSG 。
An internal potential amplitude generation module: for setting reactive power command value Q according to three-phase inverter ref Reference value E of the grid voltage amplitude 0 The three-phase inverter outputs active power Q e The magnitude E of the potential in the three-phase inverter is calculated.
An internal potential amplitude limiting module: for determining the amplitude E of the internal potential of the three-phase inverter, the filter inductance L and the current limiting value I of the three-phase inverter max Grid voltage amplitude V g AC current I of the parallel network g Virtual rotor angular velocity omega VSG AC voltage value and AC current value of the grid-connected point under dq coordinate system, calculating amplitude limiting three-phase inverter internal potential amplitude E' and outputting signal T in current out-of-limit link LIM 。
And a modulation module: for determining the phase θ of the electric potential in the three-phase inverter according to the amplitude E' of the electric potential in the three-phase inverter after amplitude limiting VSG At θ VSG Performing Park inverse transformation as a rotation angle to obtain a three-phase inverter modulation wave, and comparing the three-phase inverter modulation wave with a carrier signal V m Modulation is performed to generate a switching control signal D for controlling the three-phase inverter.
Furthermore, the internal potential phase generation module consists of a simulated rotor motion equation link and an angular velocity compensation control link based on power grid phase change. The specific functions are as follows:
step 4.1: outputting active power P from three-phase inverter e Active power command value P given by three-phase inverter ref Rated angular frequency omega of power grid ref Inputting the rotor motion equation to obtain the virtual rotor angular velocity omega V 。
Step 4.2: outputting a signal T according to the current out-of-limit link calculated by the potential amplitude limiting module in the last moment LIM Acquiring an angular velocity compensation command omega com Virtual rotor angular velocity ω V With angular velocity compensation command omega com After addition, the virtual rotor angular velocity omega compensated at the current moment is obtained VSG 。
Step 4.3: compensating the current moment to obtain the virtual rotor angular velocity omega VSG Obtaining the potential phase theta in the three-phase inverter through an integration link VSG 。
As shown in fig. 3, further, the angular velocity compensation command ω com The acquisition method comprises the following steps:
step 4.2.1: outputting active power P from a known three-phase inverter e Angular velocity omega after compensation at last moment VSG Ac voltage V of grid-connected point g AC current I of the parallel network g Substituting the filter inductance L into the formula 1, and calculating to obtain the control phase theta of the grid-connected point of the three-phase inverter gc 。
The formula 1 is calculated as follows:
Figure BDA0003927222240000131
step 4.2.2: phase θ of the grid voltage g And theta gc After the difference is made, the angular velocity compensation instruction omega is obtained through PI control com 。
Step 4.2.3: when the current out-of-limit link calculated by the potential amplitude limiting module in the last moment outputs a signal T LIM When=1, an angular velocity compensation command ω is output com Otherwise, outputting an angular velocity compensation command omega com Is 0.
The angular velocity compensation control link is thrown when the current is out of limit, and the phase change of the power grid can be tracked while the rotor motion equation link is maintained, so that the method has the advantages that:
1) Since the rotor motion equation is maintained, a certain phase support capability is provided when the current is over-limited (i.e. during power grid faults), and other grid-following inverters can be prevented from transient instability.
2) Because the three-phase inverter tracks the phase change of the power grid, the phase difference between the output phase of the three-phase inverter and the power grid during the fault recovery resynchronization is reduced, and the impact current during the resynchronization process is reduced.
Further, the calculation formula of the potential amplitude E in the three-phase inverter is as follows:
Figure BDA0003927222240000132
wherein ,Kq And s is a Laplacian operator and is a reactive integration coefficient.
Furthermore, the internal potential amplitude limiting module is based on the traditional current amplitude limiting control strategy, and is added with a PI control link H(s) to improve the situation that the internal potential amplitude is severely changed due to current amplitude limiting under the fault, and the transient stability of the direct voltage control type grid-connected inverter can be improved through reasonable parameter setting due to the inherent regulation performance of the PI control link, and the specific functions are as follows:
step 6.1: the known potential amplitude E, the filter inductance L and the virtual rotor angular velocity omega after the current time compensation in the three-phase inverter VSG Substituting the alternating voltage value and the alternating current value of the grid-connected point under the dq coordinate system into formula 3, and calculating to obtain d and q axis components of the output current reference value of the three-phase inverter
Figure BDA0003927222240000133
and
Figure BDA0003927222240000134
The formula 3 is calculated as follows:
Figure BDA0003927222240000135
wherein ,isd and isq D-axis component and q-axis component of alternating current of grid-connected point respectively, u sd and usq The d-axis component and the q-axis component of the grid-connected point alternating current voltage are adopted, and alpha is the closed loop expected bandwidth of current control and can be set manually.
Step 6.2: outputting d-axis and q-axis components of current reference values to a three-phase inverter
Figure BDA0003927222240000141
and
Figure BDA0003927222240000142
Clipping is performed to obtain the d and q axis components of the current after clipping>
Figure BDA0003927222240000143
and
Figure BDA0003927222240000144
Current d, q-axis component
Figure BDA0003927222240000145
and
Figure BDA0003927222240000146
The calculation formula is as follows:
Figure BDA0003927222240000147
wherein ,
Figure BDA0003927222240000148
the value range is 0-9 degree for the current phase angle0 deg., can be set manually. I max The current limiting value is three-phase inverter. Representing a short-term over-leveling of the three-phase inverter that can be maximally tolerated, typically 1.3pu.
Step 6.3: based on the d-and q-axis components of the limited current
Figure BDA0003927222240000149
and
Figure BDA00039272222400001410
The d-axis and q-axis components of the internal potential amplitude are calculated.
Internal potential amplitude d-axis, q-axis component u cd and ucq The calculation formula is as follows:
Figure BDA00039272222400001411
wherein ,Hd (s) is d-axis PI control link, H q And(s) is a q-axis PI control link, and s is a Laplacian operator. α is the closed loop desired bandwidth of the current control, which can be set manually.
Step 6.4: the internal potential amplitude d, q-axis component u cd and ucq And synthesizing to obtain the amplitude E' of the potential in the three-phase inverter after amplitude limiting.
Step 6.5: judging
Figure BDA00039272222400001412
And I max Size, when->
Figure BDA00039272222400001413
When the current is over the limit, a signal T is output LIM 1, otherwise, outputting a signal T in the current out-of-limit link at the current moment LIM Is 0./>
Further, the method comprises the steps of,
Figure BDA00039272222400001414
the ratio coefficient values of the d and q axes of the PI control are as follows: k (k) pd ＝1，k pq =1; the PI control d and q axis integral coefficient value ranges are as follows: k is 0 < k id ≤5，0＜k iq The specific value is less than or equal to 0.1 and is determined according to the simulation experiment result. s is the Laplace operator.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing is only a preferred embodiment of the invention, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.

Claims (7)

1. The method for switching control of the grid-structured inverter with the phase supporting capability under the fault is characterized by comprising the following steps of: the method comprises the following steps:
step 1: acquiring alternating voltage and alternating current of a grid-connected point of a three-phase inverter, and performing Park conversion on the alternating voltage and the alternating current of the grid-connected point to obtain alternating voltage values and alternating current values of the grid-connected point of the corresponding physical quantity under a dq coordinate system;
step 2: calculating the active power P of the alternating current side of the three-phase inverter according to the alternating current voltage value and the alternating current value of the grid-connected point under the dq coordinate system e And reactive power Q e ；
Step 3: calculating the phase theta of the power grid voltage according to the three-phase voltage of the power grid side g Grid voltage amplitude V g ；
Step 4: according to the given active power command value P of the three-phase inverter ref Rated angular frequency omega of power grid ref The obtained grid voltage phase theta g Outputting a signal T in the current out-of-limit link calculated in the step 6 at the previous moment LIM The three-phase inverter outputs active power P e Calculating the potential phase θ in a three-phase inverter VSG ；
Step 5: according to the reactive power command value Q given by the three-phase inverter ref Reference value E of the grid voltage amplitude 0 The three-phase inverter outputs active power Q e Calculating the potential amplitude E in the three-phase inverter;
step 6: according to the internal potential amplitude E, the filter inductance L and the three-phase inversion of the three-phase inverterCurrent limiting value I max Grid voltage amplitude V g AC current I of the parallel network g Virtual rotor angular velocity omega VSG AC voltage value and AC current value of the grid-connected point under dq coordinate system, calculating amplitude limiting three-phase inverter internal potential amplitude E' and outputting signal T in current out-of-limit link LIM ；
Step 7: according to amplitude E' of electric potential in three-phase inverter after amplitude limitation, phase theta of electric potential in three-phase inverter VSG At θ VSG Performing Park inverse transformation as a rotation angle to obtain a three-phase inverter modulation wave, and comparing the three-phase inverter modulation wave with a carrier signal V m Modulation is performed to generate a switching control signal D for controlling the three-phase inverter.
2. The method for switching control of a grid-tied inverter with phase support under fault capability according to claim 1, wherein: the specific steps of the step 4 are as follows:
step 4.1: outputting active power P from three-phase inverter e Active power command value P given by three-phase inverter ref Rated angular frequency omega of power grid ref Inputting the rotor motion equation to obtain the virtual rotor angular velocity omega V ；
Step 4.2: outputting a signal T according to the current out-of-limit link calculated in the previous time step 6 LIM Acquiring an angular velocity compensation command omega com Virtual rotor angular velocity ω V With angular velocity compensation command omega com After addition, the virtual rotor angular velocity omega compensated at the current moment is obtained VSG ；
Step 4.3: compensating the current moment to obtain the virtual rotor angular velocity omega VSG Obtaining the potential phase theta in the three-phase inverter through an integration link VSG 。
3. The method for switching control of a grid-tied inverter with phase support under fault capability according to claim 2, wherein: the angular velocity compensation command omega com The acquisition method comprises the following steps:
step 4.2.1: will be knownThree-phase inverter outputs active power P e Angular velocity omega after compensation at last moment VSG Ac voltage V of grid-connected point g AC current I of the parallel network g Substituting the filter inductance L into the formula 1, and calculating to obtain the control phase theta of the grid-connected point of the three-phase inverter gc ；
The formula 1 is calculated as follows:
Figure FDA0003927222230000021
step 4.2.2: phase θ of the grid voltage g And theta gc After the difference is made, the angular velocity compensation instruction omega is obtained through PI control com ；
Step 4.2.3: outputting a signal T in the current out-of-limit link calculated in the step 6 at the previous moment LIM When=1, an angular velocity compensation command ω is output com Otherwise, outputting an angular velocity compensation command omega com Is 0.
4. The method for switching control of a grid-tied inverter with phase support under fault capability according to claim 1, wherein: the calculation formula of the potential amplitude E in the three-phase inverter is as follows:
Figure FDA0003927222230000022
wherein ,Kq And s is a Laplacian operator and is a reactive integration coefficient.
5. The method for switching control of a grid-tied inverter with phase support under fault capability according to claim 1, wherein: the specific steps of the step 6 are as follows:
step 6.1: the known potential amplitude E, the filter inductance L and the virtual rotor angular velocity omega after the current time compensation in the three-phase inverter VSG Substituting the alternating current voltage value and the alternating current value of the grid-connected point under the dq coordinate system into the formula 3, and calculatingCalculating to obtain d-axis and q-axis components of the output current reference value of the three-phase inverter
Figure FDA0003927222230000023
and
Figure FDA0003927222230000024
The formula 3 is calculated as follows:
Figure FDA0003927222230000025
wherein ,isd and isq D-axis component and q-axis component of alternating current of grid-connected point respectively, u sd and usq D-axis component and q-axis component of the grid-connected point alternating current voltage, and alpha is the closed loop expected bandwidth of current control;
step 6.2: outputting d-axis and q-axis components of current reference values to a three-phase inverter
Figure FDA0003927222230000031
and
Figure FDA0003927222230000032
Clipping is performed to obtain the d and q axis components of the current after clipping>
Figure FDA0003927222230000033
and
Figure FDA0003927222230000034
Current d, q-axis component
Figure FDA0003927222230000035
and
Figure FDA0003927222230000036
The calculation formula is as follows:
Figure FDA0003927222230000037
wherein ,
Figure FDA0003927222230000038
is the phase angle of the current; i max The current limiting value of the three-phase inverter is;
step 6.3: based on the d-and q-axis components of the limited current
Figure FDA0003927222230000039
and
Figure FDA00039272222300000310
Calculating the d-axis and q-axis components of the internal potential amplitude;
internal potential amplitude d-axis, q-axis component u cd and ucq The calculation formula is as follows:
Figure FDA00039272222300000311
wherein ,Hd (s) is d-axis PI control link, H q (s) is a q-axis PI control link, s is a Laplacian; α is the closed loop desired bandwidth of the current control;
step 6.4: the internal potential amplitude d, q-axis component u cd and ucq Synthesizing to obtain amplitude-limited potential amplitude E' in the three-phase inverter;
step 6.5: judging
Figure FDA00039272222300000312
And I max Size, when->
Figure FDA00039272222300000313
When the current is over the limit, a signal T is output LIM 1, otherwise, outputting a signal T in the current out-of-limit link at the current moment LIM Is 0.
6. The method for switching control of a grid-tied inverter with phase support under fault capability according to claim 5, wherein:
Figure FDA00039272222300000314
the ratio coefficient values of the d and q axes of the PI control are as follows: k (k) pd ＝1，k pq =1; the PI control d and q axis integral coefficient value ranges are as follows: k is 0 < k id ≤5，0＜k iq Less than or equal to 0.1.s is the Laplace operator.
7. A network-structured inverter switching control device with a phase supporting capability under faults is characterized in that: the device comprises the following modules:
the voltage and current measuring module is used for: the method comprises the steps of obtaining alternating voltage and alternating current of a grid-connected point of a three-phase inverter, performing Park conversion on the alternating voltage and the alternating current of the grid-connected point, and obtaining alternating voltage values and alternating current values of the grid-connected point of the corresponding physical quantity under a dq coordinate system;
and a power calculation module: calculating the active power P of the alternating current side of the three-phase inverter according to the alternating current voltage value and the alternating current value of the grid-connected point under the dq coordinate system e And reactive power Q e ；
PLL phase lock module: for calculating the phase theta of the grid voltage from the three-phase voltage of the grid side g Grid voltage amplitude V g ；
An internal potential phase generation module: for setting the active power command value P according to a three-phase inverter ref Rated angular frequency omega of power grid ref The obtained grid voltage phase theta g The current out-of-limit link output signal T calculated by the potential amplitude limiting module in the last moment LIM The three-phase inverter outputs active power P e Calculating the potential phase θ in a three-phase inverter VSG ；
An internal potential amplitude generation module: for setting reactive power command value Q according to three-phase inverter ref Reference value E of the grid voltage amplitude 0 The three-phase inverter outputs active power Q e Calculating the potential amplitude E in the three-phase inverter;
an internal potential amplitude limiting module: for determining the amplitude E of the internal potential of the three-phase inverter, the filter inductance L and the current limiting value I of the three-phase inverter max Grid voltage amplitude V g AC current I of the parallel network g Virtual rotor angular velocity omega VSG AC voltage value and AC current value of the grid-connected point under dq coordinate system, calculating amplitude limiting three-phase inverter internal potential amplitude E' and outputting signal T in current out-of-limit link LIM ；
And a modulation module: for determining the phase θ of the electric potential in the three-phase inverter according to the amplitude E' of the electric potential in the three-phase inverter after amplitude limiting VSG At θ VSG Performing Park inverse transformation as a rotation angle to obtain a three-phase inverter modulation wave, and comparing the three-phase inverter modulation wave with a carrier signal V m Modulation is performed to generate a switching control signal D for controlling the three-phase inverter.
CN202211381836.1A 2022-11-04 2022-11-04 Switching control method of grid-structured inverter with phase supporting capability under fault Pending CN116054233A (en)

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CN117269838A (en) * 2023-11-22 2023-12-22 中国电力科学研究院有限公司 Method and system for determining short-circuit current of network-structured power electronic equipment
CN117895555A (en) * 2024-03-12 2024-04-16 南方电网数字电网研究院股份有限公司 Electric automobile fills electric pile that possesses trouble electric wire netting and supports and emergent power supply function

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117269838A (en) * 2023-11-22 2023-12-22 中国电力科学研究院有限公司 Method and system for determining short-circuit current of network-structured power electronic equipment
CN117269838B (en) * 2023-11-22 2024-01-30 中国电力科学研究院有限公司 Method and system for determining short-circuit current of network-structured power electronic equipment
CN117895555A (en) * 2024-03-12 2024-04-16 南方电网数字电网研究院股份有限公司 Electric automobile fills electric pile that possesses trouble electric wire netting and supports and emergent power supply function
CN117895555B (en) * 2024-03-12 2024-08-13 南方电网数字电网研究院股份有限公司 Electric automobile fills electric pile that possesses trouble electric wire netting and supports and emergent power supply function

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