CN104218605A - Non-impact-current grid connection method for three-phase voltage source grid-connected inverters - Google Patents

Non-impact-current grid connection method for three-phase voltage source grid-connected inverters Download PDF

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CN104218605A
CN104218605A CN201410430914.1A CN201410430914A CN104218605A CN 104218605 A CN104218605 A CN 104218605A CN 201410430914 A CN201410430914 A CN 201410430914A CN 104218605 A CN104218605 A CN 104218605A
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grid
phase
voltage
current
shaft
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CN104218605B (en
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李永丽
靳伟
张玮亚
孙广宇
李小叶
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Tianjin University
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Tianjin University
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Abstract

The invention relates to a non-impact-current grid connection method for three-phase voltage source grid-connected inverters. The non-impact-current grid connection method includes acquiring various phases of voltages and currents on two sides of each grid-connected point in real time and computing D-axis voltage components and Q-axis voltage components of inverter sides; computing D-axis voltage components and Q-axis voltage components of grid sides; controlling the D-axis voltage components and the Q-axis voltage components, regulating duty cycles of driving signals of three-phase half-bridge circuits by the aid of inner current rings and outer control rings which are the D-axis voltage components and the Q-axis voltage components, and driving main circuits to output alternating currents in an inverter manner; operating the three-phase voltage source grid-connected inverters according to the steps before the three-phase voltage source grid-connected inverters are connected with grids, and gradually regulating the three-phase voltage source grid-connected inverters after grid-connected circuit breakers are assuredly reliably closed so that the three-phase voltage source grid-connected inverters can be in steady constant-power output states. The non-impact-current grid connection method has the advantages that impact currents can be effectively suppressed in voltage source inverter grid connection procedures, grid-connected output currents of the three-phase voltage source grid-connected inverters can be gradually increased until the grid-connected output currents reach steady values, and non-impact-current grid connection effects can be realized.

Description

The non-impact current combination method of three-phase voltage source type combining inverter
Technical field
The invention belongs to the generating of electric power, power transformation or distribution technique field.It is a kind of combination method that effectively can suppress the grid-connected impulse current of combining inverter.
Background technology
In recent years using distributed power source the supplementing as conventional power source that photovoltaic and wind power generation are representative, in increasing access electrical network.Can directly to confess industrial-frequency alternating current different from conventional synchronization machine, distributed power source directly can not produce industrial-frequency alternating current usually, therefore most by rectification or inverter realize grid-connected and store, and inverter be once-through type distributed power source access electrical network main interface.
Inverter is device direct current being changed into alternating current, and classify from the type of DC source, inverter direct voltage source being changed into alternating current output is called voltage source inverter, and inverter DC current source being changed into alternating current output is called current source inverter.In distributed power source access, usually use voltage source inverter direct voltage to be converted into voltage or the electric current access electrical network of power frequency.
At present, voltage source inverter adopts and controls active power or the reactive power that output current tracking voltage on line side exports specified quantitative in grid-connected steady operation.The output voltage of the output voltage tracking network side of the not direct control inverter of this control mode, but utilize each phase current values of real-time sampling to calculate the duty ratio of output.Due to not output current before grid-connected inverters, therefore when starting grid-connected, initial samples electric current is zero, the output voltage of inverter can not the voltage of tracking network side so there will be larger impulse current grid-connected time.Typically the numerical value of this impulse current is comparatively large, even may be several times as much as rated current, and this can produce serious impact to power device and other elements.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of three-phase voltage source type combining inverter combination method can avoiding producing serious grid-connected impulse current is provided.Technical scheme of the present invention is as follows:
For a non-impact current combination method for three-phase voltage source type combining inverter, comprise the following steps:
(1) grid-connected switch is disconnected;
(2) at three-phase inverter and site grid side gathers three phase network phase voltage: A phase voltage U a, B phase voltage U b, C phase voltage U c; And site inverter side gathers three-phase inverter exports phase voltage: A phase voltage U a, B phase voltage U b, C phase voltage U c, at the three-phase current I of also site inverter side collection inverter output a, I b, I c, obtain α shaft current component I through Clarke conversion α, β shaft current component I β;
(3) by three-phase phase-locked loop algorithm by electrical network three-phase voltage vector be oriented on the D axle of synchronous rotating frame, calculate the angle theta of A axle under rotating coordinate system D axle and static three phase coordinate systems;
(4) carrying out DQ conversion with θ to exporting phase voltage from the three-phase inverter that also site inverter side collects, obtaining inverter side D shaft voltage component U dwith Q shaft voltage component U q; θ is utilized to carry out DQ conversion to from the three phase network phase voltage that also site grid side collects; Obtain netting side D shaft voltage component U dwith Q shaft voltage component U q;
(5) D shaft voltage regulon is set, D shaft voltage component is controlled: utilize the inverter side D shaft voltage component U calculated dwith grid side D shaft voltage component U dcompare, obtain voltage difference; Carry out proportional integral adjustment to voltage difference, the output of D shaft voltage regulon is U dout; Q shaft voltage regulon is set, Q shaft voltage component is controlled: utilize the inverter side Q shaft voltage component U calculated qwith grid side Q shaft voltage component U qcompare, obtain voltage difference; Carry out proportional integral adjustment to voltage difference, the output of Q shaft voltage regulon is U qout;
(6) by U doutand U qoutcarry out Park inverse transformation, obtain α axle component U respectively α outwith beta-axis component U β out;
(7) α shaft current regulon is set, α shaft current component is controlled: arranging this current regulation unit reference value is I α ref; By U before grid-connected α outassignment is to I α refas with reference to value, with I αcompare and obtain current differential; The adjustment of ratio resonance is carried out to current differential, obtains α axle and export I α out;
β shaft current regulon is set again, β shaft current component is controlled: arranging this current regulation unit reference value is I β ref, by U before grid-connected β outassignment is to I β refas with reference to value and, I βcompare and obtain current differential; The adjustment of ratio resonance is carried out to current differential, obtains β axle and export I β out;
(8) by I α outand I β outcarry out Clarke inverse transformation, be converted to the reference signal I under three-phase static coordinate system aref, I bref, I cref; According to I aref, I bref, I crefoutput regulate the duty ratio of the drive singal of three-phase half-bridge circuit respectively, drive major loop inversion output AC electricity;
(9) run according to above step (2) to (8) before grid-connected, when all judging net side D shaft voltage component U being no less than continuously in 5 ac cycles dwith inverter side D shaft voltage component U ddifference absolute value be less than threshold values U maxafter, can think that the three-phase no-load voltage that inverter exports is followed and the three-phase voltage of site grid side completely; On meeting after condition, send close a floodgate grid-connected signal and after sending signal continuous service step (2) be no less than 20ms to (8), to guarantee that grid-connected circuit breaker reliably closes;
(10) after determining that grid-connected circuit breaker reliably closes, by the reference value I of α shaft current regulon α refwith the reference value I of β shaft current regulon β refbe set to the α axle reference value I calculated by steady-state output power respectively online_ α refwith β axle reference value I online_ β ref, inverter will progressively be adjusted to the constant power output state of stable state.
The present invention can realize the effective suppression to impulse current in grid-connected inverters, makes it be increased to steady-state value gradually at grid-connected output current.
Accompanying drawing explanation
Fig. 1 is based on the voltage source inverter structure of LCL filter and grid-connected control method schematic diagram.
Fig. 2 grid-connected control method flow chart.
Fig. 3 actual employing non-impact current combination method and three-phase current waveform in network process.
Fig. 4 actual employing non-impact current combination method and A phase current waveform in network process.
The implication of each label in accompanying drawing and in word:
T 1-T 6for IGBT switching tube, its composition three-phase voltage source type inverter;
L s, L g, C, R are the inductance forming three-phase LCL type filter, electric capacity and resistance;
I afor A phase current sampling value, I bfor B phase current sampling value, I cfor C phase current sampling value;
U afor grid side A phase voltage, U bfor grid side B phase voltage, U cfor grid side C phase voltage;
U afor inverter side A phase voltage, U bfor inverter side B phase voltage, U cfor inverter side C phase voltage.
I αfor I a, I b, I cthe α shaft current component obtained is converted, I through Clarke βfor the β shaft current component that same procedure obtains;
U dfor U a, U b, U cthe D shaft voltage component obtained after DQ conversion, U qfor the Q shaft voltage component in like manner obtained;
U dfor U a, U b, U cthe D shaft voltage component obtained after DQ conversion, U qfor the Q shaft voltage component in like manner obtained;
U doutfor D axis scale integral controller regulates D shaft voltage input U dwith reference U dthe output obtained, U qoutfor Q axis scale integral controller regulates Q shaft voltage input U qwith reference U qthe output obtained;
U α outfor U doutand U qoutcarry out anti-Clarke conversion, the α axle component obtained, U β outfor the beta-axis component in like manner obtained;
I online_ α refthat the steady-state current calculated by permanent merit operational mode exports the current reference value on α axle; I online_ β refthat the steady-state current calculated by permanent merit operational mode exports the current reference value on β axle;
I α refit is the reference value of ratio resonant control unit on α axle.I β refit is the reference value of ratio resonant control unit on β axle;
I α outthe output of ratio resonant control unit on α axle.I β outthe output of ratio resonant control unit on β axle;
U errcontrolled quentity controlled variable U dwith U as a reference dthe absolute value of difference;
U maxbe determine whether can be grid-connected threshold values;
Break is grid-connected short-circuiting device control signal, and grid-connected circuit breaker is opened in 0 expression, and 1 represents closed grid-connected circuit breaker;
I, j are the count value in program; M, n are count upper-limit.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be described.This combination method, for the three-phase voltage source type inverter utilizing output current to control as inner ring, solves its problem at grid-connected instantaneous generation impulse current.Inverter for this Control Cooling cannot obtain correlated current amount thus the problem that generation control was lost efficacy when grid-connected before grid-connected, and the nothing that the present invention realizes this type inverter by the mode of switching control strategy impacts cutting-in control.Primary circuit topological sum Control system architecture as shown in Figure 1.
Usually according to the filter difference that inverter adopts, its current inner loop control strategy is not identical yet, have employed proportional resonant control method for LCL filter in this method so that this cutting-in control flow process to be described, but its general principle is also applicable to adoption rate integral controller to carry out the combining inverter of Current Control.
Realize this combination method and basically need following three each and every one unit: voltage regulation unit, current regulation unit and cutting-in control unit.
1, voltage regulation unit:
Voltage regulation unit realizes based on the proportional plus integral control under two cordic phase rotators.The basic task of voltage regulation unit provides reference value at grid-connected forward current control unit.The controlled quentity controlled variable that voltage-regulation is introduced is the three-phase phase voltage U that inverter side exports a, U b, U cthe U obtained is changed through DQ d, U q.Owing to there are two controlled quentity controlled variables, two voltage control units are set D axle and Q shaft voltage are controlled respectively.Adopt grid side three-phase phase voltage U respectively a, U b, U center DQ and change the U obtained d, U qas reference value.Basic pi controller is utilized to calculate output U according to the difference of controlled quentity controlled variable and reference value dout, U qout.
2, current regulation unit:
Current regulation unit is based on the ratio resonance control realization under two-phase rotating coordinate system.The basic task of Current adjustment is the generation directly controlling three-phase voltage source type inverter reference waveform, makes its electric current exported meet the requirement of controller.Stablizing in grid-connected situation, the reference value of current regulation unit is the I calculated according to the requirement of constant power output online_ α ref, I online_ β ref; And be provided by the output of voltage regulation unit in grid-connected front reference value.
The input I of current regulation unit α, I βfor I a, I b, I cobtain through Clarke conversion, two identical ratio resonance regulons are set and realize Current Control.Because voltage regulation unit exports U before grid-connected dout, U qoutproduce under two-phase rotating coordinate system, therefore this has to pass through anti-Clarke conversion and obtains U α out, U β out.As the reference value of current regulation unit.
The adjustment of passing ratio resonant controller, current regulation unit exports I α out, I β out.These two values are using the reference of the pwm pulse generation as driving major loop IGBT.
3, cutting-in control unit:
Cutting-in control unit is the core of combination method in this patent.Its major function judges whether inverter output voltage meets grid-connected conditions, and on the basis meeting grid-connected conditions, provide the switching that breaker closing order realizes control mode simultaneously.
Grid-connected circuit breaker is opened, the reference value I of setting current regulation unit α ref, I β refbe that two voltage regulation unit export the U obtained through Park inverse transformation α out, U β out.Ask inverter side phase voltage D axle component U dwith grid side phase voltage D axle component U dthe absolute value of difference, called after U err.Work as U errmeet a continuous n control cycle and be less than default threshold values U maxafter, judge that inverter output voltage follows voltage on line side completely, send grid-connected breaker closing order.
After sending close commands, m periodic Control strategy should be kept constant, reliably close to make circuit breaker.After completing grid-connected action, the reference value I of setting current regulation unit α ref, I β reffor the I that the requirement of constant power output calculates online_ α ref, I online_ β ref, inverter brings into operation in stable state constant power output state.Fig. 2 illustrates the flow chart of cutting-in control unit, and it utilizes loop structure to realize above-mentioned functions.
Fig. 3 and Fig. 4 illustrates the present invention's situation in actual applications.The method that the combining inverter built according to the structure shown in Fig. 1 adopts the present invention to propose is carried out and net operation.After judgement meets grid-connected conditions, closed grid-connected switch command is sent as can see from Figure 3 at 0.1s moment controller, outer inscription of loop 4 ac cycles of ME for maintenance afterwards, this time is determined by the reliable ON time of grid-connected switch, is usually no less than an ac cycle.Can see that therefore output current is very little because this period of time inverter output voltage follows the tracks of line voltage all the time.Afterwards, switching outer shroud is that output-constant operation controls, and now electric current starts to increase until it reaches pre-determined stability value.Fig. 4 shows separately the change in this course of A phase current, B phase and C phase current waveform similar with it.Survey the waveform obtained by experiment and can absolutely prove that this method can effectively suppress grid-connected impulse current.
The concrete steps of the non-impact current combination method for three-phase voltage source type combining inverter of the present invention are as follows:
(1) grid-connected switch is disconnected;
(2) at three-phase inverter and site grid side gathers three phase network phase voltage: A phase voltage U a, B phase voltage U b, C phase voltage U c; And site inverter side gathers three-phase inverter exports phase voltage: A phase voltage U a, B phase voltage U b, C phase voltage U c, at the three-phase phase current I of also site inverter side collection inverter output a, I b, I c, obtain α shaft current component I through Clarke conversion α, β shaft current component I β;
(3) by three-phase phase-locked loop algorithm by electrical network three-phase voltage vector be oriented on the D axle of synchronous rotating frame, by calculating the angle theta of A axle under rotating coordinate system D axle and static three phase coordinate systems [1,2];
(4) carrying out DQ conversion with θ to exporting phase voltage from the three-phase inverter that also site inverter side collects, obtaining inverter side D shaft voltage component U dwith Q shaft voltage component U q; θ is utilized to carry out DQ conversion to from the three phase network phase voltage that also site grid side collects; Obtain netting side D shaft voltage component U dwith Q shaft voltage component U q;
(5) D shaft voltage regulon is set, D shaft voltage component is controlled: utilize the inverter side D shaft voltage component U calculated dwith grid side D shaft voltage component U dcompare, obtain voltage difference; Carry out proportional integral adjustment to voltage difference, the output of D shaft voltage regulon is U dout; Q shaft voltage regulon is set, Q shaft voltage component is controlled: utilize the inverter side Q shaft voltage component U calculated qwith grid side Q shaft voltage component U qcompare, obtain voltage difference; Carry out proportional integral adjustment to voltage difference, the output of Q shaft voltage regulon is U qout;
(6) by U doutand U qoutcarry out Park inverse transformation, obtain α axle component U respectively α outwith beta-axis component U β out;
(7) α shaft current regulon is set, α shaft current component is controlled: arranging this current regulation unit reference value is I α ref; By U before grid-connected α outassignment is to I α refas with reference to value, with I αcompare and obtain current differential; The adjustment of ratio resonance is carried out to current differential, obtains α axle and export I α out;
β shaft current regulon is set again, β shaft current component is controlled: arranging this current regulation unit reference value is I β ref, by U before grid-connected β outassignment is to I β refas with reference to value and, I βcompare and obtain current differential; The adjustment of ratio resonance is carried out to current differential, obtains β axle and export I β out;
(8) by I α outand I β outcarry out Clarke inverse transformation, be converted to the reference signal I under three-phase static coordinate system aref, I bref, I cref; According to I aref, I bref, I crefoutput regulate the duty ratio of the drive singal of three-phase half-bridge circuit respectively, drive major loop inversion output AC electricity;
(9) run according to above step (2) to (8) before grid-connected, when all judging net side D shaft voltage component U being no less than continuously in 5 ac cycles dwith inverter side D shaft voltage component U ddifference absolute value be less than threshold values U maxafter, can think that the three-phase no-load voltage that inverter exports is followed and the three-phase voltage of site grid side completely; On meeting after condition, send close a floodgate grid-connected signal and after sending signal continuous service step (2) to (8) be no less than 20ms to guarantee that grid-connected circuit breaker reliably closes;
(10) after determining that grid-connected circuit breaker reliably closes, by the reference value I of α shaft current regulon α refwith the reference value I of β shaft current regulon β refbe set to the α axle reference value I calculated by steady-state output power respectively online_ α refwith β axle reference value I online_ β ref, inverter will progressively be adjusted to the constant power output state of stable state.
The source of above-mentioned " embodiment " inner list of references related to is as follows:
[1]Chung?S?K.Phase-locked?loop?for?grid-connected?three-phase?power?conversion?systems[C]//Electric?Power?Applications,IEE?Proceedings-.IET,2000,147(3):213-219.
[2]Kaura?V,Blasko?V.Operation?of?a?phase?locked?loop?system?under?distorted?utility?conditions[C]//Applied?Power?Electronics?Conference?and?Exposition,1996.APEC'96.Conference?Proceedings?1996.,Eleventh?Annual.IEEE,1996,2:703-708.

Claims (1)

1., for a non-impact current combination method for three-phase voltage source type combining inverter, comprise the following steps:
(1) grid-connected switch is disconnected;
(2) at three-phase inverter and site grid side gathers three phase network phase voltage: A phase voltage U a, B phase voltage U b, C phase voltage U c; And site inverter side gathers three-phase inverter exports phase voltage: A phase voltage U a, B phase voltage U b, C phase voltage U c, at the three-phase current I of also site inverter side collection inverter output a, I b, I c, obtain α shaft current component I through Clarke conversion α, β shaft current component I β;
(3) by three-phase phase-locked loop algorithm by electrical network three-phase voltage vector be oriented on the D axle of synchronous rotating frame, calculate the angle theta of A axle under rotating coordinate system D axle and static three phase coordinate systems;
(4) carrying out DQ conversion with θ to exporting phase voltage from the three-phase inverter that also site inverter side collects, obtaining inverter side D shaft voltage component U dwith Q shaft voltage component U q; θ is utilized to carry out DQ conversion to from the three phase network phase voltage that also site grid side collects; Obtain netting side D shaft voltage component U dwith Q shaft voltage component U q;
(5) D shaft voltage regulon is set, D shaft voltage component is controlled: utilize the inverter side D shaft voltage component U calculated dwith grid side D shaft voltage component U dcompare, obtain voltage difference; Carry out proportional integral adjustment to voltage difference, the output of D shaft voltage regulon is U dout; Q shaft voltage regulon is set, Q shaft voltage component is controlled: utilize the inverter side Q shaft voltage component U calculated qwith grid side Q shaft voltage component U qcompare, obtain voltage difference; Carry out proportional integral adjustment to voltage difference, the output of Q shaft voltage regulon is U qout;
(6) by U doutand U qoutcarry out Park inverse transformation, obtain α axle component U respectively α outwith beta-axis component U β out;
(7) α shaft current regulon is set, α shaft current component is controlled: arranging this current regulation unit reference value is I α ref; By U before grid-connected α outassignment is to I α refas with reference to value, with I αcompare and obtain current differential; The adjustment of ratio resonance is carried out to current differential, obtains α axle and export I α out;
β shaft current regulon is set again, β shaft current component is controlled: arranging this current regulation unit reference value is I β ref, by U before grid-connected β outassignment is to I β refas with reference to value, with I βcompare and obtain current differential; The adjustment of ratio resonance is carried out to current differential, obtains β axle and export I β out;
(8) by I α outand I β outcarry out Clarke inverse transformation, be converted to the reference signal I under three-phase static coordinate system aref, I bref, I cref; According to I aref, I bref, I crefoutput regulate the duty ratio of the drive singal of three-phase half-bridge circuit respectively, drive major loop inversion output AC electricity;
(9) run according to above step (2) to (8) before grid-connected, when all judging net side D shaft voltage component U being no less than continuously in 5 ac cycles dwith inverter side D shaft voltage component U ddifference absolute value be less than threshold values U maxafter, can think that the three-phase no-load voltage that inverter exports is followed and the three-phase voltage of site grid side completely; On meeting after condition, send close a floodgate grid-connected signal and after sending signal continuous service step (2) be no less than 20ms to (8), to guarantee that grid-connected circuit breaker reliably closes;
(10) after determining that grid-connected circuit breaker reliably closes, by the reference value I of α shaft current regulon α refwith the reference value I of β shaft current regulon β refbe set to the α axle reference value I calculated by steady-state output power respectively online_ α refwith β axle reference value I online_ β ref, inverter will progressively be adjusted to the constant power output state of stable state.
CN201410430914.1A 2014-08-28 2014-08-28 The non-impact current combination method of three-phase voltage source type interconnected inverter Expired - Fee Related CN104218605B (en)

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CN105449721A (en) * 2015-12-18 2016-03-30 北京天诚同创电气有限公司 Method and device for controlling power current of converter
CN108365628A (en) * 2018-03-12 2018-08-03 江苏固德威电源科技股份有限公司 Three-phase photovoltaic grid-connected inverting device non-impact current grid-connected control method
CN110176780A (en) * 2019-04-15 2019-08-27 江苏大学 A kind of low voltage ride through control method based on the compensation virtual self-induction of armature winding
CN110350565A (en) * 2018-12-24 2019-10-18 国网天津市电力公司 A kind of VSC-HVDC system control method based on ratio resonant controller

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CN103078545A (en) * 2013-01-15 2013-05-01 东华大学 Control circuit for stand-alone /grid-connected dual-mode inverter and switching technology thereof
CN103259282A (en) * 2013-04-08 2013-08-21 许继集团有限公司 Soft cut-in method for non-isolated type photovoltaic grid-connected inverter and isolated type photovoltaic grid-connected inverter
CN103944186A (en) * 2014-04-23 2014-07-23 浙江大学 Control device of three-phase photovoltaic grid-connected inverter

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Publication number Priority date Publication date Assignee Title
CN103078545A (en) * 2013-01-15 2013-05-01 东华大学 Control circuit for stand-alone /grid-connected dual-mode inverter and switching technology thereof
CN103259282A (en) * 2013-04-08 2013-08-21 许继集团有限公司 Soft cut-in method for non-isolated type photovoltaic grid-connected inverter and isolated type photovoltaic grid-connected inverter
CN103944186A (en) * 2014-04-23 2014-07-23 浙江大学 Control device of three-phase photovoltaic grid-connected inverter

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105449721A (en) * 2015-12-18 2016-03-30 北京天诚同创电气有限公司 Method and device for controlling power current of converter
CN105449721B (en) * 2015-12-18 2018-10-23 北京天诚同创电气有限公司 Method and device for controlling power current of converter
CN108365628A (en) * 2018-03-12 2018-08-03 江苏固德威电源科技股份有限公司 Three-phase photovoltaic grid-connected inverting device non-impact current grid-connected control method
WO2019174331A1 (en) * 2018-03-12 2019-09-19 江苏固德威电源科技股份有限公司 Impact-current-free grid-connected control method for three-phase photovoltaic grid-connected inverter
CN108365628B (en) * 2018-03-12 2022-01-14 固德威技术股份有限公司 Three-phase photovoltaic grid-connected inverter non-impact current grid-connected control method
CN110350565A (en) * 2018-12-24 2019-10-18 国网天津市电力公司 A kind of VSC-HVDC system control method based on ratio resonant controller
CN110176780A (en) * 2019-04-15 2019-08-27 江苏大学 A kind of low voltage ride through control method based on the compensation virtual self-induction of armature winding
CN110176780B (en) * 2019-04-15 2022-12-16 江苏大学 Low-voltage ride through control method based on virtual self-inductance of compensation armature winding

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