CN113078831B - Current-source-based wireless transmitter power supply current-sharing controller and method - Google Patents
Current-source-based wireless transmitter power supply current-sharing controller and method Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
- H02J1/102—Parallel operation of dc sources being switching converters
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
- H02J1/106—Parallel operation of dc sources for load balancing, symmetrisation, or sharing
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/23—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only arranged for operation in parallel
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Abstract
The invention discloses a wireless transmitter power supply current sharing controller and a method based on a current source. The current sharing control of the two current source modules can be realized. The invention avoids enumeration and selection of space vectors, thereby being conveniently applied to the current sharing of any plurality of current source modules in parallel connection and having good expandability.
Description
Technical Field
The invention belongs to the field of radio, and particularly relates to a current-sharing controller and a current-sharing method for a power supply of a wireless transmitter based on a current source.
Background
With the development of 5G technology, the power of wireless transmitters is increasing, which puts higher demands on the power supply of wireless transmitters. To increase the power of the wireless transmitter power supply, capacity expansion by series-parallel connection of modular power supplies has become a common approach. However, it is worth noting that due to the inconsistency of hardware parameters, the series-parallel connection of the modular power supplies has the problem of voltage sharing and current sharing, and if the modular power supplies are not properly processed, a barrel effect is formed among a plurality of power supply modules, so that the service life and the operation reliability of the equipment are greatly reduced.
On the other hand, the rectification type power supply is divided into a voltage source and a current source according to different energy storage modes at the direct current side. At present, the voltage source type rectifying power supply is dominant due to factors such as cost and efficiency. However, the voltage source contains a large amount of capacitors, and the short circuit problem of the equipment cannot be avoided. Because the direct current loop of the current source is provided with the direct current reactor, the current source has natural short circuit resistance. With the increasing power of wireless transmitter power supplies, current sources are expected to find further application in this area.
Due to the factors of inconsistent hardware parameters, communication delay and the like, the problem of unbalanced direct current bridge arm current exists when a plurality of current source modules are connected in parallel. In order to solve the problem, the existing method realizes active control of direct current bridge arm currents of a plurality of modules through redundant selection of space vectors. However, it should be noted that the implementation of this method depends on enumeration and selection of spatial vectors, and if the number of parallel modules continuously increases, the number of vectors increases exponentially, so the extensibility of the existing method is severely limited.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a current-source-based wireless transmitter power supply current-sharing controller and a method.
The purpose of the invention is realized by the following technical scheme:
a wireless transmitter power supply current sharing controller based on a current source comprises a power frequency grid, an alternating current LC filter, a first current source module, a second current source module, a direct current reactor, a transmitter load, a voltage sensor, a first current sensor, a phase-locked loop, a first PI controller, a second current sensor, a first low-pass filter, a second PI controller, a third PI controller, a fourth PI controller, a fifth PI controller, a third current sensor, a second low-pass filter, a sixth PI controller, an SVPWM (space vector pulse width modulation) module, a first adder, a second adder, a third adder, a fourth adder, a first subtracter, a second subtracter, a third subtracter, a fourth subtracter and a fifth subtracter;
the power frequency power grid is connected with the alternating current LC filter, the voltage sensor and the first current sensor; the alternating current side of the first current source module and the second current source module which are connected in parallel is connected with the alternating current LC filter;
the direct current sides of the first current source module and the second current source module are connected with one end of the direct current reactor; the direct current reactors of the upper bridge arm of each current source module are connected in parallel and then connected with the transmitter load; the direct current reactors of the lower bridge arm of each current source module are connected in parallel and then are also connected with the transmitter load;
the voltage sensor and the current sensor I are used for collecting three-phase power grid voltage v g，abc With three-phase network current i g，abc And transmitting the collected voltage and current information to a phase-locked loop; the phase-locked loop is connected with the voltage sensor and the current sensor I, and acquires the voltage v of the three-phase power grid g，abc With three-phase network current i g，abc Then, the power factor angle theta is generated g And transmits the data to a first PI controller;
the first PI controller is connected with the phase-locked loop and obtains a power factor angle theta g Then, generating a delay angle alpha; the second current sensor is connected with the direct current reactor to collect four direct current bridge arm currents;
the first low-pass filter is connected with the second current sensor and used for filtering high-frequency components in the direct current bridge arm current and generating direct current I p1 、I p2 、I n1 、I n2 The first subtractor, the second subtractor, the third subtractor and the fourth subtractor are respectively connected;
the second PI controller is connected with the first subtracter to generate delay angle variation delta alpha 1 Sending the signals to a first adder;
the third PI controller is connected with the second subtracter to generate delay angle variation delta alpha 2 And sending the signals to a second adder;
the PI controller IV is connected with the third subtracter to generate a modulation ratio variation delta m a1 Sending the signals to a third adder;
the fifth PI controller is connected with the fourth subtracter to generate delay angle variation delta m a2 Sending the signals to a fourth adder;
the emitter load is sequentially connected with a current sensor III, a low-pass filter II, a fifth subtracter and a PI controller VI, and the PI controller VI is connected with a third adder and a fourth adder; the current sensor III collects load current from one end of the emitter load; the second low-pass filter filters high frequency in load currentComponent and generate a load current I dc (ii) a The PI controller six generates a total modulation ratio m a Sending to a third adder and a fourth adder;
the first adder is connected with the first PI controller and the second PI controller to generate a delay angle alpha of the current source module 1 Sending to an SVPWM modulation module;
the second adder is connected with the first PI controller and the PI controller to generate a second delay angle alpha of the current source module 1 Sending to an SVPWM modulation module;
the third adder is connected with the fourth PI controller and the sixth PI controller to generate a modulation ratio m of the current source module a1 Sending to an SVPWM modulation module;
the fourth adder is connected with a fifth PI controller 16 and a sixth PI controller to generate a second modulation ratio m of the current source module a2 Sending to an SVPWM modulation module;
the SVPWM modulation module is connected with the first adder, the second adder, the third adder and the fourth adder and used for receiving m a1 、α 1 、m a2 、α 2 And the SVPWM module is connected with the first current source module and the second current source module and is used for controlling the on-off of corresponding switch tubes in the two modules.
Furthermore, the alternating current LC filter consists of a three-phase alternating current flat wave inductor and a three-phase film capacitor.
Furthermore, the first current source module and the second current source module are composed of a current source type three-phase full bridge circuit.
Furthermore, the switching device adopted by the current source type three-phase full-bridge circuit is an IGBT series diode.
In addition, based on the controller, the invention also provides a current sharing control method of the power supply of the wireless transmitter based on the current source, which comprises the following steps:
(1) the power frequency power grid provides electric energy; the first current source module and the second current source module are used for alternating current-direct current electric energy conversion, filtering high-frequency ripples through an alternating current LC filter and assisting the phase conversion process of the current source modules; the fluctuation of the direct current is stabilized through a direct current reactor;
(2) the transmitter load receives the electric energy transmitted by the power grid; voltage sensor collects three-phase power grid voltage v g，abc With three-phase network current i g，abc And transmitting the collected voltage and current information to a phase-locked loop; the phase-locked loop acquires the voltage v of the power grid g，abc With the current i of the grid g，abc Then, the power factor angle theta is generated g And transmits the data to a first PI controller;
(3) first PI controller obtains power factor angle theta g Then, generating a delay angle alpha;
(4) the current sensor II collects four direct current bridge arm currents; the low-pass filter I filters out high-frequency components in the direct current bridge arm current and generates direct current I p1 、I p2 、I n1 、I n2 ；
(5) Generating delay angle variation delta alpha by PI controller II 1 (ii) a PI controller three-generation delay angle variation delta alpha 2 (ii) a PI controller four generates modulation ratio variation Δ m a1 (ii) a PI controller five generation delay angle variation delta m a2 ；
(6) The current sensor III collects load current from one end of the emitter load; a second low-pass filter for filtering high-frequency component in the load current and generating a load current I dc (ii) a Six PI controller generates total modulation ratio m a Sending to a third adder and a fourth adder;
(7) the first adder generates a delay angle alpha of the current source module 1 Sending to an SVPWM modulation module; the second adder generates a second delay angle alpha of the current source module 2 Sending to an SVPWM modulation module; the third adder generates a modulation ratio m of the current source module a1 Sending to an SVPWM modulation module; the fourth adder generates a second modulation ratio m of the current source module a2 Sending to an SVPWM modulation module;
(8) SVPWM modulation module receiving m a1 、α 1 、m a2 、α 2 And generating a modulation signal of the first current source module and a modulation signal of the second current source module, wherein the SVPWM modulation module is used for controlling the on-off of corresponding switch tubes in the first current source module and the second current source module.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
(1) compared with a wireless transmitter power supply of a voltage source, the wireless transmitter power supply has natural short-circuit resistance and better input and output characteristics, and can better ensure the running reliability of transmitter load.
(2) Compared with the traditional current source control method, the method can ensure the consistency of the direct current bridge arm currents of all the current sources under the condition that the hardware parameters of the circuit are inconsistent or the transmission delay of the control signals is different, thereby effectively prolonging the service life and improving the reliability of equipment.
(3) Compared with the current source current sharing method under the condition of space vector modulation, the method avoids enumeration and selection of the space vector, thereby being suitable for parallel current sharing control of any plurality of current source modules and having good expandability.
(4) According to the invention, while the power factor of the input side and the load current of the output side of the power supply are controlled by the first PI controller and the sixth PI controller, the four direct current bridge arm currents of the two current source modules are respectively controlled by the second PI controller, the third PI controller, the fourth PI controller and the fifth PI controller, so that the current sharing control of the two current source modules is realized while the unit power factor operation and the load current are controllable. It can be seen that the present invention only uses the PI controller to control the upper and lower dc bridge arm currents of each current source module, and does not perform redundant selection on the space vector. The method avoids enumeration and selection of space vectors, so that the method can be conveniently applied to current sharing of any plurality of current source modules connected in parallel, and has good expandability.
Drawings
FIG. 1 is a schematic diagram of a power supply current sharing controller according to the present invention;
FIGS. 2a and 2b are graphs comparing the electric simulation effect of the current sharing controller of the present invention with that of the conventional art;
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 is a schematic structural diagram of a current sharing control technology for a wireless transmitter power supply based on a current source, which includes a power frequency grid 1, an alternating current LC filter 2, a current source module i 3, a current source module ii 4, a dc reactor 5, a transmitter load 6, a voltage sensor 7, a current sensor i 8, a phase-locked loop 9, a PI controller i 10, a current sensor ii 11, a low-pass filter i 12, a PI controller ii 13, a PI controller iii 14, a PI controller iv 15, a PI controller iv 16, a current sensor iii 17, a low-pass filter ii 18, a PI controller iv 19, an SVPWM modulation module 20, an adder 21, an adder 22, an adder 23, an adder 24, a subtractor 25, a subtractor 26, a subtractor 27, a subtractor 28, and a subtractor 29.
The power frequency power grid 1 is connected with the alternating current LC filter 2 and is also connected with a voltage sensor 7 and a current sensor I8; the alternating current LC filter 2 is connected with the power frequency power grid 1 and is also connected with the first current source module 3 and the second current source module 4; the first current source module 3 and the second current source module 4 are connected in parallel at the alternating current side and then connected with the alternating current LC filter 2, and are connected with the direct current reactor 5 at the direct current side; one end of the direct current reactor 5 is connected with direct current ports of the first current source module 3 and the second current source module 4, and the direct current reactors 5 of the upper bridge arms of each current source module are connected in parallel and then connected with the transmitter load 6; the direct current reactors 5 of the lower bridge arm of each current source module are connected in parallel and then are also connected with the transmitter load 6;
the voltage sensor 7 and the first current sensor 8 are connected with the power frequency power grid 1 and connected with the phase-locked loop 9; the phase-locked loop 9 is connected with a first PI controller 10; the second current sensor 11 is connected with the direct current reactor 5; the first low-pass filter 12 is connected with the second current sensor 11 and respectively connected with a subtracter 25, a subtracter 26, a subtracter 27 and a subtracter 28; the second PI controller 13 is connected with the subtracter 25 and the adder 21; the third PI controller 14 is connected with the subtracter 26 and the adder 22; the PI controller IV 15 is connected with the subtracter 27 and the adder 23; the PI controller five 16 is connected with the subtracter 28 and the adder 24;
the emitter load 6 is sequentially connected with a current sensor III 17, a low-pass filter II 18, a subtracter 29 and a PI controller VI 19, and the PI controller VI 19 is connected with the subtracter 29, an adder 23 and an adder 24; the SVPWM module 20 is connected with an adder 21, an adder 22, an adder 23, an adder 24, a first current source module 3 and a second current source module 4; the adder 21 is connected with the first PI controller 10 and the second PI controller 13 and is connected with the SVPWM module 20; the adder 22 is connected with the first PI controller 10 and the third PI controller 14 and is connected with the SVPWM module 20; the adder 23 is connected with the PI controller IV 15 and the PI controller VI 19 and is connected with the SVPWM module 20; the adder 24 is connected with the PI controller five 16 and the PI controller six 19 and is connected with the SVPWM module 20;
the power frequency power grid 1 is used for providing electric energy for the whole device; the alternating current LC filter 2 is used for filtering high-frequency ripples and assisting the phase change process of the current source module; the first current source module 3 and the second current source module 4 are used for alternating current-direct current electric energy conversion; the direct current reactor 5 is used for stabilizing the fluctuation of direct current; the transmitter load 6 is used for receiving electric energy transmitted by a power grid; the voltage sensor 7 and the current sensor I8 are used for acquiring three-phase power grid voltage v g，abc With three-phase network current i g，abc (ii) a The phase locked loop 9 is used to generate the power factor angle theta g (ii) a The PI controller I10 is used for generating a delay angle alpha; the second current sensor 11 is used for collecting four direct current bridge arm currents; the low-pass filter I12 is used for filtering high-frequency components in the direct current bridge arm current and generating direct current I p1 、I p2 、I n1 、I n2 (ii) a The second PI controller 13 is used for generating delay angle variation delta alpha 1 (ii) a The third PI controller 14 is used for generating delay angle variation delta alpha 2 (ii) a The fourth PI controller 15 is used for generating the modulation ratio variation delta m a1 (ii) a The fifth PI controller 16 is configured to generate the delay angle variation Δ m a2 (ii) a The current sensor III 17 is used for collecting load current; the second low-pass filter 18 is used for filtering high-frequency components in the load current; the PI controller six 19 is used for generating the total modulation ratio m a (ii) a The SVPWM module 20 is used for generating a module I modulation signal and a module II modulation signal and controlling the on-off of corresponding switch tubes in the two modules; the adder 21 is used to generate a module-delay angle α 1 (ii) a The adder 22 is used forGenerating a module two delay angle alpha 2 (ii) a The adder 23 is used to generate the module-modulation ratio m a1 (ii) a The adder 24 is used for generating a module two modulation ratio m a2 ；
Fig. 2a and fig. 2b are graphs comparing the electrical simulation effect of the current-sharing controller of the present invention with that of the conventional technology, wherein fig. 2a is a simulation waveform of the current of the dc bridge arm of the parallel current source module under the conventional control technology. It can be seen that, due to the fact that hardware parameters of the two current source modules are inconsistent, the upper bridge arm current and the lower bridge arm current of the two current source modules have obvious difference. Fig. 2b shows the current simulation waveforms of the upper and lower bridge arms of two current source modules after the current-sharing control technique of the present invention is adopted. It can be seen that, after the current-sharing control technology is adopted, the upper and lower direct current bridge arms of the two current source modules have good consistency.
The present invention is not limited to the above-described embodiments. The foregoing description of the specific embodiments is intended to describe and illustrate the technical solutions of the present invention, and the above specific embodiments are merely illustrative and not restrictive. Those skilled in the art can make many changes and modifications to the invention without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (1)
1. A wireless transmitter power supply current-sharing control method based on a current source comprises a power frequency grid (1), an alternating current LC filter (2), a first current source module (3), a second current source module (4), a direct current reactor (5), a transmitter load (6), a voltage sensor (7), a first current sensor (8), a phase-locked loop (9), a first PI controller (10), a second current sensor (11), a first low-pass filter (12), a second PI controller (13), a third PI controller (14), a fourth PI controller (15), a fifth PI controller (16), a third current sensor (17), a second low-pass filter (18), a sixth PI controller (19), an SVPWM modulation module (20), a first adder (21), a second adder (22), a third adder (23), a fourth adder (24), A first subtractor (25), a second subtractor (26), a third subtractor (27), a fourth subtractor (28), and a fifth subtractor (29);
the power frequency power grid (1) is connected with the alternating current LC filter (2), the voltage sensor (7) and the current sensor I (8); the alternating current side of the parallel connection of the first current source module (3) and the second current source module (4) is connected with the alternating current LC filter (2);
the direct current sides of the first current source module (3) and the second current source module (4) are connected with one end of the direct current reactor (5); the direct current reactors (5) of the upper bridge arm of each current source module are connected in parallel and then connected with the transmitter load (6); the direct current reactor (5) of the lower bridge arm of each current source module is connected with the transmitter load (6) after being connected in parallel;
the voltage sensor (7) and the current sensor I (8) are used for acquiring three-phase power grid voltage v g，abc With three-phase network current i g，abc And transmitting the collected voltage and current information to a phase-locked loop (9); the phase-locked loop (9) is connected with the voltage sensor (7) and the current sensor I (8), and the phase-locked loop (9) acquires the voltage v of the three-phase power grid g，abc With three-phase network current i g，abc Then, the power factor angle theta is generated g And transmits it to the first PI controller (10);
the PI controller I (10) is connected with a phase-locked loop (9) and obtains a power factor angle theta g Then, generating a delay angle alpha; the second current sensor (11) is connected with the direct current reactor (5) to collect four direct current bridge arms;
the low-pass filter I (12) is connected with the current sensor II (11) and is used for filtering high-frequency components in the direct current bridge arm current and generating direct current I p1 、I p2 、I n1 、I n2 The first subtractor (25), the second subtractor (26), the third subtractor (27) and the fourth subtractor (28) are respectively connected;
the second PI controller (13) is connected with a first subtracter (25) to generate delay angle variation delta alpha 1 Sent to a first adder (21);
the third PI controller (14) is connected with a second subtracter (26) to generate delay angle variation delta alpha 2 And fed to a second adder (22);
the PI controller IV (15) is connected with a third subtracter (27) to generate a modulation ratio variation delta m a1 And fed to a third adder (23);
the PI controller five (16) is connected with a fourth subtracter (28) to generate a delay angle variation delta m a2 And fed to a fourth adder (24);
the emitter load (6) is sequentially connected with a current sensor III (17), a low-pass filter II (18), a fifth subtracter (29) and a PI controller VI (19), and the PI controller VI (19) is connected with a third adder (23) and a fourth adder (24); a third current sensor (17) collects a load current from one end of the transmitter load (6); the second low-pass filter (18) filters high-frequency components in the load current and generates the load current I dc (ii) a The PI controller six (19) generates a total modulation ratio m a Sending to a third adder (23) and a fourth adder (24);
the first adder (21) is connected with the first PI controller (10) and the second PI controller (13) to generate a delay angle alpha of the current source module 1 Sending to an SVPWM modulation module (20);
the second adder (22) is connected with the first PI controller (10) and the third PI controller (14) to generate a second delay angle alpha of the current source module 2 Sending to an SVPWM modulation module (20);
the third adder (23) is connected with the PI controller IV (15) and the PI controller VI (19) to generate a modulation ratio m of the current source module I a1 Sending to an SVPWM modulation module (20);
the fourth adder (24) is connected with a fifth PI controller (16) and a sixth PI controller (19) to generate a second modulation ratio m of the current source module a2 Sending to an SVPWM modulation module (20);
the SVPWM module (20) is connected with a first adder (21), a second adder (22), a third adder (23) and a fourth adder (24) and receives m a1 、α 1 、m a2 、α 2 And generating a first current source moduleThe SVPWM modulation module (20) is connected with the first current source module (3) and the second current source module (4) and is used for controlling the on-off of corresponding switch tubes in the two modules, and the SVPWM modulation module is characterized by comprising the following steps:
(1) the power frequency power grid (1) provides electric energy; the first current source module (3) and the second current source module (4) are used for alternating current-direct current electric energy conversion, filtering high-frequency ripples through the alternating current LC filter (2) and assisting the phase conversion process of the current source modules; the fluctuation of the direct current is stabilized through a direct current reactor (5);
(2) the transmitter load (6) receives the electric energy transferred by the power grid; the voltage sensor (7) collects the three-phase power grid voltage v g，abc With three-phase network current i g，abc And transmitting the collected voltage and current information to a phase-locked loop (9); the phase-locked loop (9) is obtaining the voltage v of the power grid g，abc With the current i of the grid g，abc Then, the power factor angle theta is generated g And transmits it to the first PI controller (10);
(3) the first PI controller (10) obtains a power factor angle theta g Then, generating a delay angle alpha;
(4) a second current sensor (11) collects four direct current bridge arm currents; the low-pass filter I (12) filters high-frequency components in the direct current bridge arm current and generates direct current I p1 、I p2 、I n1 、I n2 ；
(5) The second PI controller (13) generates a delay angle variation delta alpha 1 (ii) a PI controller III (14) generates delay angle variation delta alpha 2 (ii) a PI controller IV (15) generates the modulation ratio variation Deltam a1 (ii) a PI controller five (16) generates delay angle variation Deltam a2 ；
(6) A third current sensor (17) collects a load current from one end of the transmitter load (6); a second low-pass filter (18) for filtering high-frequency components in the load current and generating a load current I dc (ii) a PI controller six (19) generates the total modulation ratio m a Sending to a third adder (23) and a fourth adder (24);
(7) a first adder (21) generates a delay angle alpha of the current source module 1 Sending to an SVPWM modulation module (20); a second adder (22) generates a current source moduleTwo retardation angles alpha 2 Sending to an SVPWM modulation module (20); a third adder (23) generates a current source module-modulation ratio m a1 Sending to an SVPWM modulation module (20); a fourth adder (24) generates a second modulation ratio m of the current source module a2 Sending to an SVPWM modulation module (20);
(8) the SVPWM modulation module (20) receives m a1 、α 1 、m a2 、α 2 And a modulation signal of the first current source module and a modulation signal of the second current source module are generated, and the SVPWM modulation module (20) is used for controlling the on-off of corresponding switch tubes in the first current source module (3) and the second current source module (4).
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