CN106532725A - Power distribution network voltage control method based on virtual synchronous generator type distributed generation - Google Patents
Power distribution network voltage control method based on virtual synchronous generator type distributed generation Download PDFInfo
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Classifications
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The invention discloses a power distribution network voltage control method based on virtual synchronous generator type distributed generation. A VSG-DG control system used by the method acquires inner-loop current and output current of a VSG-DG and voltage at a PCC portion of a VSG-DG integrated net through a voltage/current acquisition module. Through a power calculation module, an active-frequency control module and a reactive-voltage control module, an active frequency modulation function and a wattles voltage regulation function of a synchronous power generator are simulated. Furthermore through a voltage converting module, a voltage compensation control module, a DC voltage control module and a current control module, consistency between an output external characteristic of the VSG-DG and the external characteristic of the synchronous power generator is realized, wherein the reactive-voltage control module adaptively set a PCC voltage compensation reference value according to a PCC voltage fluctuation condition, thereby effectively restraining voltage fluctuation at the PCC portion.
Description
Technical field
The invention belongs to the field of electric power quality management of distributed power generation active distribution network, and in particular to a kind of based on virtual
The distribution network voltage control method of synchronous generator type distributed power source.
Background technology
Traditional power distribution network usually relies on flexible network structure and larger Capacity Margin to tackle the uncertain of load
Property, to ensure the safe and reliable of power system, its progress control method is relatively easy.In recent ten years, Power Electronic Technique
Fast development solves distributed power source (distributed generation, DG) and asks in being incorporated into the power networks for low and medium voltage distribution network
Topic, promotes DG and is widely used in each level of power system.But, traditional power distribution network yet suffers from regenerative resource and disappears
Receive scarce capacity, rack weakness, automatization level is not high, scheduling mode is backward and the interactive level of electricity consumption is more low asks
Topic, seriously constrains the hypersynchronous of DG, is unfavorable for optimizing and revising for energy resource structure.In the face of load growth is slow, power distribution network is sent out
Exhibition space resources is limited, the present situation of the more difficult extension of network size, and active distribution network technology is arisen at the historic moment, it is intended to solve electrical network compatible
And using extensive batch (-type) regenerative resource lifted green energy resource utilization rate, optimization primary energy structure the problems such as.
Traditional passive type power distribution network adopts on-site elimination intermittent energy pattern.After DG accesses power distribution network, due to DG
With the feature such as intermittence, randomness, non-linear, if intermittent energy institute electricity is superfluous, power distribution network itself does not adjust energy
Power cannot go up delivery electrical network, can only reduce its operation of exerting oneself.And active distribution network has the regulating power of intermittent energy of dissolving,
If intermittent energy institute electricity is superfluous, by flexible load and multi-level electricity under conditions of the constraint of distribution network operation is met
The layering digestion capability of net dissolve surplus the energy.However, this can cause power distribution network trend occur reversely, in active distribution network
(AND) any position of feeder line is likely to Voltage Cortrol problem occur, and quality of voltage control faces more acute challenge.
In recent years, virtual synchronous electric generator type distributed power source (VSG-DG) for being integrated with synchronous generator Controlling model are obtained
Universal concern is arrived.Due to its realize regenerative resource net unit and synchronous generator physically with it is mathematical etc.
Effect, can effectively reduce the grid-connected impact to electrical network of extensive regenerative resource, cause the widely studied interest in global range.
Fig. 1 show a feeder line of the active distribution network for having accessed VSG-DG, including three common bus PCC and three groups
Load, accesses some DG and VSG-DG at each common bus PCC.DG includes the micro- source of direct current, three-phase full-bridge inverter, LC filters
Wave circuit and DG control systems, VSG-DG include DC bus capacitor, three-phase full-bridge inverter, LC filter circuits and VSG-DG
Control system.VSG-DG is the output external characteristic and synchronous generator external characteristics one that DG is made by the control of VSG-DG control systems
Cause, wherein VSG-DG control systems mainly include work(- frequency control module and idle-voltage control module, VSG-DG controls
Method is the exit potential electric current by gathering VSG-DG, through active-frequency control module and idle-voltage control module,
Output pulse width modulated signal, pulse width modulating signal are input to three-phase full-bridge inverter, change inverter output power,
So as to simulate the operating mechanism of synchronous generator.The function of accessing the VSG-DG of active distribution network at present mainly improves electrical network
Frequency stability.When there is voltage pulsation problem in electrical network, VSG-DG cannot quick response and improve active distribution network voltage control
Controlling the water circulation is put down.Everything is not all corresponded with the requirement of active distribution network.
The content of the invention
Present invention solves the technical problem that being：Existing VSG-DG control methods fail outside fine simulation synchronous generator
Characteristic and the common bus PCC voltage pulsations of active distribution network ADN cannot be suppressed.
The concrete technical scheme of the present invention is as follows：A kind of power distribution network electricity based on virtual synchronous electric generator type distributed power source
Pressure control method, it is characterised in that comprise the following steps：
S1, the control system for building virtual synchronous electric generator type distributed power source VSG-DG, mainly adopt including voltage x current
Collection module, power computation module, active-frequency control module, idle-voltage control module, voltage transformation module, voltage compensation
Control module, DC voltage control module and current control module, voltage x current acquisition module are used for the internal ring for gathering VSG-DG
Magnitude of voltage at current value, output current value and VSG-DG grid-connected common bus PCC, the outfan of voltage x current acquisition module connect
Connect the input of the input, the input of idle-voltage control module and current control module of power computation module, energy meter
The outfan for calculating module connects the input of active-frequency control module, the input of idle-voltage control module and voltage benefit
The outfan for repaying the input of module, the outfan of active-frequency control module and idle-voltage control module is all connected with voltage
The input of modular converter, the outfan of voltage transformation module connect the input of voltage compensation module, voltage compensation control
The outfan of the outfan and DC voltage control module of molding block is all connected with the input of current control module, current control mould
The outfan of block connects the three-phase full-bridge inverter of VSG-DG；
S2, voltage x current acquisition module collection VSG-DGiValue of the voltage in three phase static abc coordinate systems at the PCC of access
vabcAnd VSG-DGiOutput current three phase static abc coordinate systems value iabc,i, calculate voltage v at PCCabcModulus value V, and
Real-time voltage value v being converted in biphase static α β coordinate systemsαβ, wherein VSG-DGiTo access i-th VSG- of PCC
DG；
S3, power computation module calculate VSG-DGiThe idle Q of outputiP active with outputi；
S4, idle-voltage control module arrange PCC voltage compensation reference values according to PCC voltage pulsation situations, self adaptation
Vref；
S5, setting VSG-DGiIdle reference value Q of outputref,iWith active reference value P of outputref,i, idle-voltage control
Module is according to voltage compensation reference value Vref, export idle QiWith idle reference value Q of outputref,i, export VSG-DGiIt is virtual fixed
Sub- internal e.m.f.Wherein, kuWith K be respectively idle-voltage control module sagging coefficient with
Integral coefficient；Active-frequency control module is according to the active P of outputiWith active reference value P of outputref,i, export VSG-DGiVoid
Intend electrical angleWherein, J is rotary inertia, and D is damped coefficient, and ω is VSG rotor angular frequencies；
S6, voltage transformation module are by virtual stator internal e.m.f. EiWith virtual electrical angle θ1,i, calculate control reference voltage
Wherein
S7, voltage compensation module are according to control reference voltageReal-time voltage vαβQ idle with outputi, calculate VSG-DGi
Output current reference process amountWhereinnP,iTo there is the distribution of work
Coefficient, ke,pFor voltage error proportionality coefficient, kP,P、kI,PThe respectively proportionality coefficient and integral coefficient of voltage compensation module；
S8, setting VSG-DGiRated direct voltageCollection VSG-DGiDC voltage VDC,i, unidirectional current is voltage-controlled
Molding block is calculated as real-time DC voltage maintaining rated direct voltage and VSG-DGiThe active power that need to be absorbedWherein kP,DCAnd kI,DCThe respectively proportionality coefficient and integration of DC voltage control module
Coefficient, and calculate the watt current that need to be absorbed
S9, current control module are by output current reference valueWith VSG-DGiRated current INRelatively
Afterwards, composite pulse width modulated input signal, exports to VSG-DG after pulse width modulationiThree-phase full-bridge inverter.
Further, S4 is concretely comprised the following steps：If voltage modulus value V ＞ 1.07V at PCCN, voltage compensation reference valueIf voltage modulus value V ＜ 0.93V at PCCN, voltage compensation reference
ValueIf 0.93VN＜ V ＜ 1.07VN, voltage compensation reference value
Vref=VN；Wherein VNIt is power distribution network rated voltage, H is sample rate, Δ Vs2For the electricity in the 2nd sampling period after PCC voltage pulsations
Pressure variable quantity, t is the moment for starting timing from voltage pulsation, and the voltage compensation reference value adjustments time is
After PCC voltage pulsations, the trajectory tortuosity of self adaptation arc tangent curvature control is determined according to PCC voltage deviation degree,
Voltage adjustment time is determined according to PCC voltage change ratios, the robustness of active distribution network voltage and frequency is improve.
Further, in S9, the concrete execution step of current control module is：
S9.1 synthesizes VSG-DGiOutput current reference valueIf output current reference valueExceed
VSG-DGiRated current IN, then
S9.2 output current reference valuesWith the output current value i of voltage x current acquisition module collectionαβ,iBy the first ratio
Example resonant controller, obtains VSG-DGiInternal ring current reference value
S9.3 internal ring current reference valuesDeduct interior loop current value iL,αβ,iAfterwards through the second ratio resonant controller, obtain
PWM control input signal U under biphase static α β coordinate systemsPWM,i,αβ；
S9.4 is tied to the conversion of three phase static abc coordinate systems through biphase static α β coordinates, obtains three phase static abc coordinates
PWM control input signal U under systemPWM,i,abc, input PWM signal generating units carry out pulse width modulation, export after impulse modulation to
VSG-DGiThree-phase full-bridge inverter.
Output current reference value amplitude limit is carried out when VSG-DG output currents reference value reaches or goes beyond the limit of in step S9.1,
VSG-DG is avoided to transship.
The invention has the beneficial effects as follows：(1) the VSG-DG control systems that this method is used pass through voltage x current acquisition module
Voltage at the interior circular current of collection VSG-DG, output current and VSG-DG grid-connected PCC, through power computation module, active-frequency
Rate control module and idle-voltage control module, to the active frequency modulation and idle voltage regulation function of simulating synchronous generator, then lead to
Overvoltage modular converter, voltage compensation module, DC voltage control module and current control module, realize that VSG-DG's is defeated
Go out external characteristics consistent with synchronous generator external characteristics, wherein idle-voltage control module is according to PCC voltage pulsation situations, it is adaptive
PCC voltage compensation reference values should be set, effectively suppress voltage pulsation at PCC；(2) it is after PCC voltage pulsations, inclined according to PCC voltages
Difference degree determines the trajectory tortuosity of self adaptation arc tangent curvature control, determines voltage adjustment time according to PCC voltage change ratios, carries
The high robustness of active distribution network voltage and frequency；(3) using the control method VSG-DG not only can independent operating,
Wireless parallel operation can be realized, with very high motility and reliable nargin, different capabilities VSG-DG through transport is solved
Power distribution problems during row, more agree with intelligent grid for the requirement of power electronic equipment plug and play；(4) in VSG-DG
Output current reference value amplitude limit is carried out when output current reaches or goes beyond the limit of, it is to avoid VSG-DG transships.The method meets matches somebody with somebody
The current demand that electrical network DG permeabilities constantly increase, realizes the Comprehensive Control of the PCC qualities of power supply, compensate for DG power and does not know
Property the quality of voltage that brings reduce problem, improve and come power distribution network local and region voltage quality, realize power distribution network safety and
Stable operation.
Description of the drawings
Fig. 1 is a feeder line structure schematic diagram of the active distribution network containing multiple DG and VSG-DG.
Fig. 2 is the primary circuit structure and control system architecture schematic diagram of a VSG-DG.
Fig. 3 is the voltage reference value change schematic diagram with Adaptive.
Specific embodiment
The present invention will be described with reference to the accompanying drawings and examples.
As shown in Fig. 2 one VSG-DG of the present invention includes primary circuit and VSG-DG control systems, VSG-DG control systems
Mainly include voltage x current acquisition module, power computation module, active-frequency control module, idle-voltage control module, electricity
Pressure modular converter, voltage compensation module, DC voltage control module and current control module, voltage x current acquisition module are used
In the grid-connected PCC places magnitude of voltage of the collection interior loop current value of VSG-DG, output current value and the VSG-DG, voltage x current gathers mould
The outfan of block connects input, the input of idle-voltage control module and the current control module of power computation module
Input, the outfan of power computation module connect the input of active-frequency control module, idle-voltage control module
The input of input and voltage compensation module, the outfan of active-frequency control module and idle-voltage control module it is defeated
Go out the input that end is all connected with voltage transformation module, the outfan of voltage transformation module connects the input of voltage compensation module
End, the outfan of the outfan and DC voltage control module of voltage compensation module are all connected with the input of current control module
End, the outfan of current control module connect the three-phase full-bridge inverter of VSG-DG.
Below with i-th VSG-DG of access PCCiAs a example by explanation control method of the present invention.
A kind of distribution network voltage control method based on virtual synchronous electric generator type distributed power source, comprises the following steps：
Step 1, build VSG-DG as described aboveiControl system.
Value v of the voltage in three phase static abc coordinate systems at step 2, current/voltage acquisition module collection PCCabc=[va vb
vc]TAnd VSG-DGiOutput current three phase static abc coordinate systems value iabc,i=[ia,i ib,i ic,i]T, calculate electricity at PCC
Pressure vabcModulus value V, and by vabcAnd iabc,iMagnitude of voltage v in biphase static α β coordinate systems is converted to by formula (1)αβAnd output
Current value iαβ,i,
Wherein
Step 3, power computation module calculate VSG-DGiThe idle Q of outputiP active with outputi：
Step 4, idle-voltage control module self adaptation arrange voltage control reference value V of PCCref, concretely comprise the following steps：
(1) after PCC voltages occur fluctuation, calculate the 2nd sampling period voltage variety Δ V after PCC voltage pulsationss2：
ΔVs2=Vs2-Vs1 (3)
Wherein Vs1、Vs2The magnitude of voltage of respectively first sampled point and second sampled point.
(2) according to power system for the requirement of below 35kV distribution network voltages, under normal circumstances, the deviation of PCC voltages
Should be within ± 7%.Consider that to be divided in voltage pulsation temporarily rise or temporarily drop two kinds of situations, to VrefMethod to set up be three kinds：
(a) V ＞ 1.07VNWhen,
Wherein VNIt is power distribution network rated voltage, H is sample rate (kHz).As shown on the solid line in figure 3, voltage control reference value
VrefControl there is self adaptation arc tangent curvature control characteristic：Initial period, voltage control reference value V are controlled in voltageref's
Rate of change is little, on the one hand hides the transient process of distribution network voltage fluctuation, and on the other hand other voltage-regulation of wait power distribution network set
The standby common voltage that participates in is controlled, and reduces VSG-DGiOutput pressure；Final stage, voltage control reference are controlled in voltage
Value VrefRate of change also very little, it is therefore an objective to accurate gentle recovery power distribution network PCC voltages are to load voltage value.Wherein t is from electricity
At the moment of pressure fluctuation beginning timing, the voltage compensation reference value adjustments time isVrefRegulating time according to PCC voltages
After fluctuation, the 2nd sampling period voltage change ratio carries out self-adaptative adjustment, and PCC voltage change ratios are bigger, and regulating time is more long.
(b) V ＜ 0.93VNWhen,
As shown in phantom in Figure 3, voltage control reference value VrefAlso there is self adaptation arc tangent curvature control characteristic：In electricity
Voltage-controlled initial period processed, voltage control reference value VrefRate of change it is little, on the one hand hide distribution network voltage fluctuation transient state mistake
On the other hand journey, waits power distribution network other voltage adjusters to participate in jointly voltage control, reduces VSG-DGiOutput pressure
Power；Final stage, voltage control reference value V are controlled in voltagerefRate of change also very little, it is therefore an objective to accurate gentle recovery is matched somebody with somebody
Electrical network PCC voltages are to load voltage value.
(c)0.93VN＜ V ＜ 1.07VNWhen, now power distribution network occurs in that slight voltage pulsation, can be according to normal operation
State setting voltage reference value：
Vref=VN (6)
Step 5, (1) arrange VSG-DGiIdle reference value Q of outputref,iWith active reference value P of outputref,i。
(2) by Vref、Qref,iAnd QiIt is input into idle-voltage control module, obtains VSG-DGiVirtual stator in it is electronic
Gesture Ei, control formula as follows：
Wherein, kuIt is the sagging coefficient and integral coefficient of idle-voltage controller respectively with K.
(3) by Pref,iAnd PiBe input into VSG it is active-frequency control module, obtain VSG-DGiVirtual electrical angle θ1,i, control
Formula processed is as follows：
Wherein, J is rotary inertia, and D is damped coefficient, and ω is VSG rotor angular frequencies.
Step 6, voltage transformation module are by EiAnd θ1,iSynthesis control reference voltageWith
Wherein
Step 7, voltage compensation module are divided into α voltage compensations module and β voltage compensation modules, respectively according to input referenceWithObtain VSG-DGiOutput current reference process amountCan be expressed as：
WhereinnP,iFor VSG-DGiActive partition coefficient, ke,pFor voltage error ratio
Coefficient；Voltage compensation module is designed to PI controllers, kP,P、kI,PThe respectively proportionality coefficient and integral coefficient of PI controllers.
When system enters stable state,Due to ke,PFor fixed constant, access same
At PCCAnd vαβAll same, therefore access the n at same PCCP,iQiIt is equal, according to VSC-DGiRated capacity arrange
nP,i, then VSC-DG in parallel will be according to the proportional output reactive power of respective rated capacity.
Step 8, setting VSG-DGiThe rated value of DC bus-bar voltageCollection VSG-DGiDC side
Voltage VDC,i, DC voltage control module is also designed to PI controllers, then VSG-DGiActive power need to be absorbedWherein kP,DCAnd kI,DCFor proportional plus integral control parameter.Calculate and maintain DC bus-bar voltage
Stable watt currentSpecially：
Step 9, current control module employ ratio resonant controller (PR), concretely comprise the following steps：
(1) current control module first synthesizes VSG-DGiOutput current reference valueIn running
In, if output current reference valueMore than VSG-DGiRated current IN, then
(2) output current reference valueWith output current value iαβ,iBy the first ratio resonant controller, VSG-DG is obtainedi
Internal ring current reference value
(3) internal ring current reference valueDeduct interior loop current value iL,αβ,iAfterwards through the second ratio resonant controller, obtain
PWM control input signal U under biphase static α β coordinate systemsPWM,i,αβ；
(4) conversion of three phase static abc coordinate systems is tied to through biphase static α β coordinates, three phase static abc coordinates are obtained
PWM control input signal U under systemPWM,i,abc, input PWM signal generating units carry out pulse width modulation, export after impulse modulation to
VSG-DGiThree-phase full-bridge inverter.
The transmission function of wherein ratio resonant controller is：
Wherein, kPRpAnd kPRrIt is the proportionality coefficient and resonance gain of ratio resonant controller respectively, ωcFor cut-off frequency.
Claims (3)
1. a kind of distribution network voltage control method based on virtual synchronous electric generator type distributed power source, it is characterised in that include
Following steps：
S1, the control system for building virtual synchronous electric generator type distributed power source VSG-DG, mainly include that voltage x current gathers mould
Block, power computation module, active-frequency control module, idle-voltage control module, voltage transformation module, voltage compensation
Module, DC voltage control module and current control module, voltage x current acquisition module are used for the interior circular current for gathering VSG-DG
Magnitude of voltage at value, output current value and VSG-DG grid-connected common bus PCC, the outfan connection work(of voltage x current acquisition module
The input of the input of rate computing module, the input of idle-voltage control module and current control module, power calculation mould
The outfan of block connects input, the input of idle-voltage control module and the voltage compensation mould of active-frequency control module
The outfan of the input of block, the outfan of active-frequency control module and idle-voltage control module is all connected with voltage conversion
The input of module, the outfan of voltage transformation module connect the input of voltage compensation module, voltage compensation mould
The outfan of the outfan and DC voltage control module of block is all connected with the input of current control module, current control module
Outfan connects the three-phase full-bridge inverter of VSG-DG；
S2, voltage x current acquisition module collection VSG-DGiValue v of the voltage in three phase static abc coordinate systems at the PCC of accessabcWith
VSG-DGiOutput current three phase static abc coordinate systems value iabc,i, calculate voltage v at PCCabcModulus value V, and by its turn
Real-time voltage value v being changed in biphase static α β coordinate systemsαβ, wherein VSG-DGiTo access i-th VSG-DG of PCC；
S3, power computation module calculate VSG-DGiThe idle Q of outputiP active with outputi；
S4, idle-voltage control module arrange PCC voltage compensation reference values V according to PCC voltage pulsation situations, self adaptationref；
S5, setting VSG-DGiIdle reference value Q of outputref,iWith active reference value P of outputref,i, idle-voltage control module
According to voltage compensation reference value Vref, export idle QiWith idle reference value Q of outputref,i, export VSG-DGiVirtual stator in
Electromotive forceWherein, kuWith the sagging coefficient that K is idle-voltage control module respectively and integration
Coefficient；Active-frequency control module is according to the active P of outputiWith active reference value P of outputref,i, export VSG-DGiVirtual electricity
AngleWherein, J is rotary inertia, and D is damped coefficient, and ω is VSG rotor angular frequencies；
S6, voltage transformation module are by virtual stator internal e.m.f. EiWith virtual electrical angle θ1,i, calculate control reference voltageWherein
S7, voltage compensation module are according to control reference voltageReal-time voltage vαβQ idle with outputi, calculate VSG-DGiIt is defeated
Go out current reference process variableWhereinnP,iFor active partition coefficient,
ke,pFor voltage error proportionality coefficient, kP,P、kI,PThe respectively proportionality coefficient and integral coefficient of voltage compensation module；
S8, setting VSG-DGiRated direct voltageCollection VSG-DGiDC voltage VDC,i, DC voltage
Control module is calculated as real-time DC voltage maintaining rated direct voltage and VSG-DGiThe active power that need to be absorbedWherein kP,DCAnd kI,DCThe respectively proportionality coefficient and integration of DC voltage control module
Coefficient, and calculate the watt current that need to be absorbed
S9, current control module are by output current reference valueWith VSG-DGiRated current INAfter relatively, close
Into pulse width modulation input signal, export to VSG-DG after pulse width modulationiThree-phase full-bridge inverter.
2. the distribution network voltage based on virtual synchronous electric generator type distributed power source according to claim 1 is controlled
Method, it is characterised in that S4's concretely comprises the following steps：If voltage modulus value V ＞ 1.07V at PCCN, voltage compensation reference valueIf voltage modulus value V ＜ 0.93V at PCCN, voltage compensation reference
ValueIf 0.93VN＜ V ＜ 1.07VN, voltage compensation reference value
Vref=VN；Wherein VNIt is power distribution network rated voltage, H is sample rate, Δ Vs2For the electricity in the 2nd sampling period after PCC voltage pulsations
Pressure variable quantity, t is the moment for starting timing from voltage pulsation, and the voltage compensation reference value adjustments time is
3. the distribution network voltage controlling party based on virtual synchronous electric generator type distributed power source according to claim 1 and 2
Method, it is characterised in that the concrete execution step of current control module is in S9：
S9.1 synthesizes VSG-DGiOutput current reference valueIf output current reference valueMore than VSG-
DGiRated current IN, then
S9.2 output current reference valuesWith output current value iαβ,iBy the first ratio resonant controller, VSG-DG is obtainedi's
Internal ring current reference value
S9.3 internal ring current reference valuesDeduct interior loop current value iL,αβ,iAfterwards through the second ratio resonant controller, obtain biphase
PWM control input signal U under static α β coordinate systemsPWM,i,αβ；
S9.4 is tied to the conversion of three phase static abc coordinate systems through biphase static α β coordinates, obtains under three phase static abc coordinate systems
PWM control input signal UPWM,i,abc, being input into PWM signal generating units carries out pulse width modulation, exports to VSG- after impulse modulation
DGiThree-phase full-bridge inverter.
Priority Applications (1)
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107102568A (en) * | 2017-06-14 | 2017-08-29 | 华北电力科学研究院有限责任公司 | Photovoltaic virtual synchronous machine stability of grid connection hardware-in―the-loop test system and method |
| CN107656436A (en) * | 2017-08-11 | 2018-02-02 | 中国电力科学研究院 | The simulated inertia control method for coordinating and device of a kind of virtual plant |
| CN108173278A (en) * | 2018-01-15 | 2018-06-15 | 清华大学 | DC voltage control device, method and the optimization method of new energy VSG frequency modulation |
| CN114865656A (en) * | 2022-05-25 | 2022-08-05 | 江苏大学 | Pi-type virtual synchronous generator control method of interface converter in alternating current-direct current hybrid micro-grid |
| CN115102301A (en) * | 2022-07-15 | 2022-09-23 | 广东泰坦智能动力有限公司 | Vehicle end synchronous control method for wireless power transmission |
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| CN104037777A (en) * | 2014-04-11 | 2014-09-10 | 天津大学 | Method for suppressing voltage vluctuation and harmonic distortion through static synchronous compensator in distribution network |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107102568A (en) * | 2017-06-14 | 2017-08-29 | 华北电力科学研究院有限责任公司 | Photovoltaic virtual synchronous machine stability of grid connection hardware-in―the-loop test system and method |
| CN107102568B (en) * | 2017-06-14 | 2020-08-04 | 华北电力科学研究院有限责任公司 | Hardware-in-loop test system and method for grid connection stability of photovoltaic virtual synchronous machine |
| CN107656436A (en) * | 2017-08-11 | 2018-02-02 | 中国电力科学研究院 | The simulated inertia control method for coordinating and device of a kind of virtual plant |
| CN108173278A (en) * | 2018-01-15 | 2018-06-15 | 清华大学 | DC voltage control device, method and the optimization method of new energy VSG frequency modulation |
| CN108173278B (en) * | 2018-01-15 | 2019-12-20 | 清华大学 | Direct-current voltage control device and method for VSG frequency modulation of new energy and optimization method |
| CN114865656A (en) * | 2022-05-25 | 2022-08-05 | 江苏大学 | Pi-type virtual synchronous generator control method of interface converter in alternating current-direct current hybrid micro-grid |
| CN115102301A (en) * | 2022-07-15 | 2022-09-23 | 广东泰坦智能动力有限公司 | Vehicle end synchronous control method for wireless power transmission |
| CN115102301B (en) * | 2022-07-15 | 2024-07-23 | 广东泰坦智能动力有限公司 | Vehicle end synchronous control method for wireless power transmission |
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| CN106532725B (en) | 2023-06-27 |
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