CN116345758A - Self-synchronization voltage source grid-connected stability improving method based on voltage control loop reshaping - Google Patents
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Abstract
The invention discloses a self-synchronization voltage source grid-connected stability improving method based on voltage control loop reshaping, and belongs to the technical field of grid-connected inverter control; the grid-connected stability improving method comprises the following steps: collecting port voltage and output current of a three-phase inverter; calculating the output active power and reactive power of the three-phase inverter according to the port voltage and the output current; according to the active power and the reactive power, calculating the amplitude and the phase of an internal potential reference value, and calculating the internal potential reference value; reshaping the voltage control loop and utilizing the internal potential reference value to generate a current control loop reference value; generating a modulation wave by utilizing a current control loop and grid voltage feedforward control; sending the modulated wave into a PWM module, and generating a driving signal so as to control an inverter; compared with the existing self-synchronizing voltage source control method, the method of the invention improves the stable operation capability of the self-synchronizing voltage source under the strong network working condition on the premise of not increasing the hardware cost.
Description
Technical Field
The invention belongs to the technical field of grid-connected inverter control, and particularly relates to a self-synchronous voltage source grid-connected stability improving method based on voltage control loop reshaping.
Background
The current source grid-connected inverter has the advantages of high power regulation speed and high renewable energy source utilization rate, but generally takes maximized active power output as a main operation target, and cannot support grid voltage and stable frequency like a traditional synchronous generator. With the continuous improvement of the new energy power generation permeability, a strong power grid is gradually changed into a weak power grid state, and the grid-connected inverter is generated in order to enhance the adaptability of the grid-connected inverter under complex working conditions.
The self-synchronizing voltage source belongs to the potential of simulating damping and inertia of a traditional synchronous generator, and can provide frequency and voltage support for a power grid, but the self-synchronizing voltage source adopting a voltage and current double-inner-loop control structure has oscillation risk under the condition of strong network.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a self-synchronization voltage source grid-connected stability improving method based on voltage control loop reshaping.
The aim of the invention can be achieved by the following technical scheme:
the topological structure of the self-synchronization voltage source grid-connected stability improvement method based on voltage control loop reshaping comprises a three-phase inverter, wherein the three-phase inverter comprises a three-phase inverter circuit, a three-phase LC filter, a three-phase voltage sensor, a three-phase current sensor and a three-phase inverter controller; the method comprises the following steps:
collecting port voltage and output current of a three-phase inverter;
calculating the output active power and reactive power of the three-phase inverter according to the port voltage and the output current;
according to the active power and the reactive power, calculating the amplitude and the phase of an internal potential reference value, and calculating the internal potential reference value;
reshaping the voltage control loop and utilizing the internal potential reference value to generate a current control loop reference value;
generating a modulation wave by utilizing a current control loop and grid voltage feedforward control;
and sending the modulated wave into a PWM module to generate a driving signal and control the three-phase inverter.
Further, the step of collecting the port voltage and the output current of the three-phase inverter includes:
s11, collecting three-phase voltage of a filter capacitor of a three-phase LC filter by using a three-phase voltage sensor as the port voltage v of a three-phase inverter abc Three-phase current sensor is used for collecting three-phase LC filter filtering inductance three-phase current as three-phase inverter output current i abc ；
S12, the port voltage v of the three-phase inverter abc And output current i abc The analog quantity is converted into digital quantity and is transmitted to a three-phase inverter controller.
Further, the calculation process of the active power and the reactive power comprises the following steps:
s21, the port voltage v abc And the port current i abc Converting from a three-phase stationary coordinate system to a two-phase stationary coordinate system;
the conversion formula for converting the three-phase static coordinate system voltage into the two-phase static coordinate system voltage is as follows:
in the formula, v a 、v b 、v c The port voltages of the phase A, the phase B and the phase C under the three-phase static coordinate system are respectively v α 、v β The voltages of the alpha axis and the beta axis ports under a two-phase static coordinate system are respectively.
The transformation formula for converting the three-phase stationary coordinate system current into the two-phase stationary coordinate system current is as follows:
wherein i is a 、i b 、i c Respectively outputting current of phase A, phase B and phase C under a three-phase static coordinate system, i α 、i β And respectively outputting current on the alpha axis and the beta axis under a two-phase static coordinate system.
S22, obtaining active power p and reactive power q output by the three-phase inverter through an instantaneous power calculation formula; the instantaneous power calculation formula is:
p＝1.5×(v α i α +v β i β )
q＝1.5×(v β i α -v α i β )。
further, the calculation process of the internal potential reference value includes:
s31, calculating the phase theta of the internal potential reference value according to an active power loop calculation formula, wherein the active power loop calculation formula is as follows:
wherein P is set Outputting an active power reference value omega for a three-phase inverter n Rated angular frequency of three-phase network, D p J is virtual moment of inertia, s is Laplacian operator;
s32, calculating the amplitude U of the internal potential reference value according to a reactive power loop calculation formula, wherein the reactive power loop calculation formula is as follows:
in which Q set Output reactive power reference value for three-phase inverter, V n For rated voltage amplitude of three-phase power grid, D q Is the reactive damping coefficient, K is the reactive inertia coefficient, v Amp The amplitude of the output voltage for the three-phase inverter. The method comprises the steps of carrying out a first treatment on the surface of the
S33, according to the internal potential parameterThe phase theta of the reference value and the amplitude U of the internal potential reference value are calculated by an internal potential calculation formula to obtain the internal potential reference value U φ-ref The internal potential calculation formula is as follows:
wherein u is φ-ref_a 、u φ-ref_b And u φ-ref_c Potential references in phase a, phase B and phase C, respectively.
Further, the calculating step of the current control loop reference value includes:
s41, taking the internal potential reference value as a reference value of a voltage control loop;
s42, calculating a voltage control loop remodelling branch, multiplying the reference value of the current control loop in the previous control period by the virtual impedance to obtain the feedback quantity 1 of the voltage control loop, and recording as u fb1 ；
S43, taking the port voltage as a feedback quantity 2 of the voltage control loop, and recording as u fb2 Calculating the feedback quantity u of the voltage control loop fb The calculation formula is as follows: u (u) fb ＝u fb1 +u fb2 ；
S44, subtracting the feedback quantity u of the voltage control loop from the reference value of the voltage control loop fb As input to the voltage control loop, the voltage control loop outputs a current control loop reference i ref 。
Further, the generation step of the modulated wave includes:
s51, subtracting the three-phase inverter output current from the current control loop reference value to be used as the input of a current control loop, and marking the current control loop output modulation wave component 1 as v mabc1 ；
S52, grid voltage feedforward component v ff For the modulated wave component 2, denoted v mabc2 Calculating a modulated wave v mabc The calculation formula is v mabc ＝v mabc1 +v mabc2 。
Further, the step of generating the driving signal includes: and comparing the modulated wave with a three-phase triangular carrier wave, and generating a driving signal by a space vector modulation method.
Self-synchronizing voltage source grid-connected stability promotion system based on voltage control loop remodelling includes:
and a data acquisition module: collecting port voltage and output current of a three-phase inverter;
and a power calculation module: calculating the output active power and reactive power of the three-phase inverter according to the port voltage and the output current;
a potential reference value calculation module: according to the active power and the reactive power, calculating the amplitude and the phase of an internal potential reference value, and calculating the internal potential reference value;
the current reference value calculation module: reshaping the voltage control loop and utilizing the internal potential reference value to generate a current control loop reference value;
a modulation wave generation module: generating a modulation wave by utilizing a current control loop and grid voltage feedforward control;
and a drive signal generation module: and sending the modulated wave into a PWM module to generate a driving signal.
The invention has the beneficial effects that:
1. according to the invention, the impedance of the remodelling self-synchronous voltage source is realized through remodelling the voltage control loop, compared with the current voltage and current double closed-loop control self-synchronous voltage source, the output current oscillation can be avoided, and the stable operation under the strong network working condition is realized.
2. According to the invention, the impedance of the self-synchronous voltage source is remodeled by optimizing the control loop, and compared with a scheme of adding actual impedance, the hardware cost can be saved.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to those skilled in the art that other drawings can be obtained according to these drawings without inventive effort.
FIG. 1 is a circuit topology of a three-phase grid-connected inverter of the present invention;
FIG. 2 is a schematic diagram of a method for controlling a self-synchronizing voltage source by reshaping a voltage control loop according to the present invention;
FIG. 3 is a graph of the voltage at the phase A port and the output current of the inverter before and after the method of the present invention is applied;
fig. 4 is a graph of the waveforms of the active power and the reactive power output by the inverter before and after the method of the present invention is applied.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
A self-synchronizing voltage source grid-connected stability improving method based on voltage control loop reshaping is shown in figure 1, and a grid-connected inverter topological structure applying the method comprises the following steps: a direct-current side power supply, a three-phase inverter, three-phase power grid impedance and a three-phase power grid; the three-phase inverter comprises a three-phase inverter circuit, a three-phase LC filter, a three-phase voltage sensor, a three-phase current sensor and a three-phase inverter controller;
in a three-phase inverter: the three-phase inverter circuit is connected with the three-phase LC filter, and the three-phase voltage sensor and the three-phase current sensor respectively sample three-phase voltage of a filter capacitor and three-phase current of a filter inductor in the three-phase LC filter and transmit sampling signals to the three-phase inverter controller; after the three-phase inverter controller is calculated, a driving signal is output to control the three-phase inverter circuit.
As shown in fig. 2, the method for improving the grid-connected stability of the self-synchronous voltage source based on the voltage control loop remodeling comprises the following steps:
s1, collecting port voltage v of three-phase inverter abc And output current i abc ；
The specific process comprises the following steps:
s11, utilizing three-phase voltageThe sensor collects three-phase voltage of a filter capacitor of a three-phase LC filter as the port voltage v of a three-phase inverter abc Three-phase current sensor is used for collecting three-phase LC filter filtering inductance three-phase current as three-phase inverter output current i abc ；
S12, the port voltage v of the three-phase inverter abc And output current i abc The analog quantity is converted into digital quantity through an analog quantity acquisition circuit and is transmitted to a three-phase inverter controller.
S2, according to the port voltage v abc And output current i abc Calculating the output active power and reactive power of the three-phase inverter;
the specific process comprises the following steps:
s21, the port voltage v of the three-phase inverter abc And port current i abc Converting from a three-phase stationary coordinate system to a two-phase stationary coordinate system;
the conversion formula for converting the three-phase static coordinate system voltage into the two-phase static coordinate system voltage is as follows:
in the formula, v a 、v b 、v c The port voltages of the phase A, the phase B and the phase C under the three-phase static coordinate system are respectively v α 、v β The voltages of the alpha axis and the beta axis ports under a two-phase static coordinate system are respectively.
The transformation formula for converting the three-phase stationary coordinate system current into the two-phase stationary coordinate system current is as follows:
wherein i is a 、i b 、i c Respectively outputting current of phase A, phase B and phase C under a three-phase static coordinate system, i α 、i β And respectively outputting current on the alpha axis and the beta axis under a two-phase static coordinate system.
S22, obtaining the active power p and the reactive power q output by the inverter through an instantaneous power calculation formula; the instantaneous power calculation formula is:
p＝1.5×(v α i α +v β i β )
q＝1.5×(v β i α -v α i β )
s3, calculating the amplitude U of the internal potential reference value and the phase theta of the internal potential reference value according to the active power p and the reactive power q, and calculating the internal potential reference value U φ-ref ；
The method comprises the following specific steps:
s31, calculating the phase theta of the internal potential reference value according to an active power loop calculation formula, wherein the active power loop calculation formula is as follows:
wherein P is set Outputting an active power reference value omega for a three-phase inverter n Rated angular frequency of three-phase network, D p J is virtual moment of inertia, s is Laplacian operator;
s32, calculating the amplitude U of the internal potential reference value according to a reactive power loop calculation formula, wherein the reactive power loop calculation formula is as follows:
in which Q set Output reactive power reference value for three-phase inverter, V n For rated voltage amplitude of three-phase power grid, D q Is the reactive damping coefficient, K is the reactive inertia coefficient, s is the Laplacian, v Amp The amplitude of the output voltage of the three-phase inverter;
s33, obtaining the internal potential reference value U through an internal potential calculation formula according to the phase theta of the internal potential reference value and the amplitude U of the internal potential reference value φ-ref The internal potential calculation formula is as follows:
wherein u is φ-ref_a 、u φ-ref_b And u φ-ref_c Potential references in phase a, phase B and phase C, respectively.
S4, remodelling the voltage control loop, and utilizing the internal potential reference value u obtained in S33 φ-ref Generating a current control loop reference value i ref ；
The method comprises the following specific steps:
s41, the internal potential reference value u obtained in step S33 φ-ref Reference value u as voltage control loop ref ；
S42, calculating a voltage control loop remodelling branch, multiplying the reference value of the current control loop in the previous control period by the virtual impedance to obtain the feedback quantity 1 of the voltage control loop, and recording as u fb1 ；
S43, the port voltage v abc The feedback quantity 2 as the voltage control loop is denoted as u fb2 Calculating the feedback quantity u of the voltage control loop fb The calculation formula is as follows: u (u) fb ＝u fb1 +u fb2 ；
S44, reference value u of voltage control loop ref Subtracting the feedback quantity u of the voltage control loop fb As input to the voltage control loop, the voltage control loop outputs a current control loop reference i ref 。
S5, generating a modulation wave by utilizing current control loop and grid voltage feedforward control;
the method comprises the following specific steps:
s51, the current control loop reference value i obtained in the step S44 is obtained ref Subtracting the three-phase inverter output current i abc As input to the current control loop, the current control loop outputs a modulated wave component 1, denoted v mabc1 ；
S52, grid voltage feedforward component v ff For the modulated wave component 2, denoted v mabc2 Calculating a modulated wave v mabc The calculation formula is v mabc ＝v mabc1 +v mabc2 ；
S6, modulating the wave generated in S52v mabc Sending the signals into a PWM module to generate driving signals and controlling a three-phase inverter;
the specific process is as follows: modulated wave v mabc The drive signal is generated by space vector modulation (SVPWM) method compared with the three-phase triangular carrier.
Application examples:
fig. 1 shows the main circuit of a typical grid-connected system. The direct current side of the main circuit part can be regarded as a direct current source with constant voltage, the direct current-alternating current conversion part is realized by a three-phase full-bridge inverter circuit consisting of 6 IGBTs, and the current output by the bridge arm is connected into a power grid after LC filtering. And the sampling part is used for obtaining the port voltage and the output current of the inverter through a sampling device. Fig. 2 shows a control part of the self-synchronous voltage source, wherein the port voltage and the output current of the inverter are input into a power calculation module to obtain the instantaneous output active power and reactive power of the inverter, the instantaneous output active power of the inverter is input into an active power/frequency (P/f) regulation module to obtain a reference internal potential phase, and the instantaneous output reactive power of the inverter is input into a reactive power/voltage (Q/u) regulation module to obtain a reference internal potential amplitude. And calculating a reference value of the voltage control loop according to the internal potential phase and amplitude, and calculating a feedback value of the voltage control loop according to the port voltage, the virtual impedance and the reference current. The reference value and the feedback value of the voltage control loop are input into the voltage regulation module in a difference way, the voltage regulation module outputs a current reference value, and further, the current reference value and the output current value are input into the current control module in a difference way. And then, adding the output value of the current control module to the port voltage of the inverter to obtain a modulation wave. And finally, generating a driving signal by modulating the modulated wave through space vector modulation SVPWM, and driving the IGBT.
The main parameter values of this embodiment are as follows: main circuit parameter, DC side voltage V dc =700v, inverter side filter inductance l=150uh, filter inductance subcircuit 0.01Ω, filter capacitance c=600uf, damping resistance R d Ac bus line voltage effective value 315V, ac bus voltage frequency f =0.2Ω 0 =50hz, a line resistance of 0Ω, a line inductance of 0Ω, an inverter rated capacity of 500kW, and an inverter switching frequency of 3.2kHz. Controller parameters, active power given P set =500 kW, reactive power given Q set =0kvar, virtual moment of inertia j=0.3, reactive inertia coefficient k=318, active damping coefficient D p = 252.87, reactive damping coefficient D q =2000, virtual resistance 0.01Ω, virtual inductance 150uH, voltage controller scaling factor K pv =50, integral coefficient K of voltage controller iv =0, current controller scaling factor K pi =0.64, integral coefficient of current controller K ii ＝100。
In order to verify the effectiveness of the self-synchronous voltage source grid-connected stability improving method based on voltage control loop reshaping, a simulation model is built in MATLAB/Simulink to perform control method effectiveness verification. The inverter runs off the network in a time period of 0-0.1 s, the grid is connected at the moment of 0.1s, the active power is given by Pset=500 kW, the reactive power is given by 0kVar, and the method is adopted at the moment of 0.4 s.
Fig. 3 shows the waveforms of the port voltage and the output current of the self-synchronizing voltage source before and after the present method is applied. The method is not adopted in the time period of 0-0.1 s, the grid is connected at the moment of 0.1s and the time period of 0.1-0.4 s, and the port voltage does not generate fluctuation and the output current oscillates because the line impedance is 0. At the moment of 0.4s, the output current oscillation is fast attenuated by adopting the method of the invention, and the output current oscillation is completely restrained at the moment of 0.8 s.
Fig. 4 shows the output of active and reactive power waveforms from a synchronous voltage source before and after the present method. The method is not adopted in the invention, and the output active power and the reactive power are oscillated. At the moment of 0.4s, the output active power and the reactive power are fast attenuated by adopting the method of the invention, the oscillation of the output active power and the reactive power at the moment of 0.8s is completely inhibited, the active power reaches a given value of 500kW, and the reactive power reaches a given value of 0kVar.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (8)
1. The topological structure of the self-synchronization voltage source grid-connected stability improvement method based on voltage control loop reshaping comprises a three-phase inverter, wherein the three-phase inverter comprises a three-phase inverter circuit, a three-phase LC filter, a three-phase voltage sensor, a three-phase current sensor and a three-phase inverter controller; characterized in that the method comprises the steps of:
collecting port voltage and output current of a three-phase inverter;
calculating the output active power and reactive power of the three-phase inverter according to the port voltage and the output current;
according to the active power and the reactive power, calculating the amplitude and the phase of an internal potential reference value, and calculating the internal potential reference value;
reshaping the voltage control loop and utilizing the internal potential reference value to generate a current control loop reference value;
generating a modulation wave by utilizing a current control loop and grid voltage feedforward control;
and sending the modulated wave into a PWM module to generate a driving signal and control the three-phase inverter.
2. The method for improving grid-connected stability of a self-synchronizing voltage source based on voltage control loop remodeling according to claim 1, wherein the step of collecting the port voltage and the output current of the three-phase inverter comprises:
s11, collecting three-phase voltage of a filter capacitor of a three-phase LC filter by using a three-phase voltage sensor as the port voltage v of a three-phase inverter abc Three-phase current sensor is used for collecting three-phase LC filter filtering inductance three-phase current as three-phase inverter output current i abc ；
S12, the port voltage v of the three-phase inverter abc And output current i abc The analog quantity is converted into digital quantity and is transmitted to a three-phase inverter controller.
3. The method for improving grid-connected stability of a self-synchronous voltage source based on voltage control loop remodeling according to claim 1, wherein the calculation process of active power and reactive power comprises:
s21, the port voltage v abc And the output current i abc Converting from a three-phase stationary coordinate system to a two-phase stationary coordinate system;
the conversion formula for converting the three-phase static coordinate system voltage into the two-phase static coordinate system voltage is as follows:
in the formula, v a 、v b 、v c The port voltages of the phase A, the phase B and the phase C under the three-phase static coordinate system are respectively v α 、v β The voltages of the alpha axis and the beta axis ports under a two-phase static coordinate system are respectively.
The transformation formula for converting the three-phase stationary coordinate system current into the two-phase stationary coordinate system current is as follows:
wherein i is a 、i b 、i c Respectively outputting current of phase A, phase B and phase C under a three-phase static coordinate system, i α 、i β And respectively outputting current on the alpha axis and the beta axis under a two-phase static coordinate system.
S22, obtaining active power p and reactive power q output by the three-phase inverter through an instantaneous power calculation formula; the instantaneous power calculation formula is:
p＝1.5×(v α i α +v β i β )
q＝1.5×(v β i α -v α i β )。
4. the method for improving grid-connected stability of a self-synchronous voltage source based on voltage control loop remodeling according to claim 1, wherein the process for calculating the internal potential reference value comprises:
s31, calculating the phase theta of the internal potential reference value according to an active power loop calculation formula, wherein the active power loop calculation formula is as follows:
wherein P is set Outputting an active power reference value omega for a three-phase inverter n Rated angular frequency of three-phase network, D p J is virtual moment of inertia, s is Laplacian operator;
s32, calculating the amplitude U of the internal potential reference value according to a reactive power loop calculation formula, wherein the reactive power loop calculation formula is as follows:
in which Q set Output reactive power reference value for three-phase inverter, V n For rated voltage amplitude of three-phase power grid, D q Is the reactive damping coefficient, K is the reactive inertia coefficient, v Amp The amplitude of the output voltage for the three-phase inverter.
S33, passing through the internal electric potential according to the phase theta of the internal electric potential reference value and the amplitude U of the internal electric potential reference valueThe potential calculation formula obtains the internal potential reference value u φ-ref The internal potential calculation formula is as follows:
wherein u is φ-ref_a 、u φ-ref_b And u φ-ref_c Potential references in phase a, phase B and phase C, respectively.
5. The method for improving grid-connected stability of a self-synchronous voltage source based on voltage control loop remodeling according to claim 1, wherein the step of calculating the current control loop reference value comprises:
s41, taking the internal potential reference value as a reference value of a voltage control loop;
s42, calculating a voltage control loop remodelling branch, multiplying the reference value of the current control loop in the previous control period by the virtual impedance to obtain the feedback quantity 1 of the voltage control loop, and recording as u fb1 ；
S43, taking the port voltage as a feedback quantity 2 of the voltage control loop, and recording as u fb2 Calculating the feedback quantity u of the voltage control loop fb The calculation formula is as follows: u (u) fb ＝u fb1 +u fb2 ；
S44, subtracting the feedback quantity u of the voltage control loop from the reference value of the voltage control loop fb As input to the voltage control loop, the voltage control loop outputs a current control loop reference i ref 。
6. The method for improving grid-connected stability of a self-synchronizing voltage source based on voltage control loop remodeling according to claim 5, wherein the step of generating the modulated wave comprises:
s51, subtracting the three-phase inverter output current from the current control loop reference value to be used as the input of a current control loop, and marking the current control loop output modulation wave component 1 as v mabc1 ；
S52, grid voltage feedforward component v ff For the modulated wave component 2, denoted v mabc2 Calculating a modulated wave v mabc The calculation formula is v mabc ＝v mabc1 +v mabc2 。
7. The method for improving grid-connected stability of a self-synchronous voltage source based on voltage control loop remodeling according to claim 1 or 6, wherein the step of generating the driving signal comprises: and comparing the modulated wave with a three-phase triangular carrier wave, and generating a driving signal by a space vector modulation method.
8. Self-synchronizing voltage source grid-connected stability promoting system based on voltage control loop remodelling, which is characterized by comprising:
and a data acquisition module: collecting port voltage and output current of a three-phase inverter;
and a power calculation module: calculating the output active power and reactive power of the three-phase inverter according to the port voltage and the output current;
a potential reference value calculation module: according to the active power and the reactive power, calculating the amplitude and the phase of an internal potential reference value, and calculating the internal potential reference value;
the current reference value calculation module: reshaping the voltage control loop and utilizing the internal potential reference value to generate a current control loop reference value;
a modulation wave generation module: generating a modulation wave by utilizing a current control loop and grid voltage feedforward control; and a drive signal generation module: and sending the modulated wave into a PWM module to generate a driving signal.
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| CN117650708B (en) * | 2023-11-15 | 2024-05-03 | 燕山大学 | Control method for improving performance of new energy hydrogen production system |
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