CN106655733B - A kind of leakage inductance energy feedback type Ripple Suppression inverter and its control method - Google Patents
A kind of leakage inductance energy feedback type Ripple Suppression inverter and its control method Download PDFInfo
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Abstract
The invention discloses a kind of leakage inductance energy feedback type Ripple Suppression inverter and its control methods.The converter main circuit topology includes DC power supply, input capacitance, primary side switch pipe, auxiliary switch, booster diode, auxiliary capacitor, isolating transformer, secondary-side switch pipe, intermediate dc bus capacitor, the first inverter bridge leg, the second inverter bridge leg and filter circuit；Its control method are as follows: inverter bridge leg input current sampled value, intermediate dc bus voltage sample value obtain current reference by current reference generation module, again by modulating wave generation module, pwm control circuit, zero-crossing comparator and logic circuit, to control current tracking its reference value on isolating transformer winding.The present invention joined the auxiliary circuit being made of auxiliary switch, booster diode and auxiliary capacitor in the straight transform part of inverter, DC supply input side low-frequency current ripple can effectively be inhibited, while feedback access can be provided for transformer leakage inductance energy.
Description
Technical field
The present invention relates to a kind of leakage inductance energy feedback type Ripple Suppression inverter and its control method, belong to isolation, miniature
Inverter realizes the inhibition of low-frequency current ripple using increased auxiliary circuit.
Background technique
In new energy and other distributed generation systems, to obtain the required High Level AC Voltage of load, inverter is general
All have prime DC converter.For this system, twice of the output frequency power pulsations feedback contained in output power is arrived
Direct current input side shows as low-frequency current ripple, influences the service life of the input sources such as battery, fuel cell, serious Shi Huiying
Ring the stability of direct-current input power supplying system.Conventional method balances power pulsations using big electrolytic capacitor, to reach inhibition
The purpose of current ripples, however electrochemical capacitor life is limited, limits the bulk life time of inverter.In recent years, occur very much
The suppression of direct current input side current ripples may be implemented especially by additional auxiliary circuit is increased in the method for buffered power pulsation
System.Fukushima K, Norigoe I, Shoyama M, et al, " Input current-ripple consideration
for the pulse-link DC-AC converter for fuel cells by small series LC
Circuit ", Proceedings of IEEE 24th Annual Applied Power Electronics Conference
And Exposition, 2009:447-451 is proposed by the way that LC series resonant circuit is added, and its resonance frequency is designed as
The scheme of twice of output frequency effectively inhibits direct current input side current ripples, but required inductance value as shown in Fig. 1
It is all bigger with capacitance, the serious power density for reducing system, and limit the service life of system.Kwon J, Kim E,
Kwon B, Nam K, " High-Efficiency Fuel Cell Power Conditioning System With Input
Current Ripple Reduction ", IEEE Transaction on Industry Electronics, 2009,56
(3): 826-834 utilizes the high frequency characteristics of converters, controls the duty ratio of main power tube, is realizing voltage transformation institute
Inhibit input side current ripples along with the duty proportion of a variation on the basis of the duty ratio needed, improves the benefit of fuel cell
With rate, as shown in Fig. 2, but program control accuracy requirement is high, and control algolithm is complicated.
Summary of the invention
It is an object of the invention to provide a kind of leakage inductance energy feedback type for technological deficiency present in above-mentioned inverter
Ripple Suppression inverter and its control method not only realize transformation of electrical energy, but also inhibit direct current input side low-frequency current ripple, and
Feedback access is provided for transformer leakage inductance energy.
The present invention to achieve the above object, adopts the following technical scheme that
A kind of leakage inductance energy feedback type Ripple Suppression inverter includes DC power supply, input capacitance, primary side switch pipe, isolation
Identical first inverter bridge leg of transformer, secondary-side switch pipe, intermediate dc bus capacitor, structure and the second inverter bridge leg and filter
Wave circuit；Wherein isolating transformer primary side winding Same Name of Ends connects the input terminal of DC power anode and input capacitance respectively, isolation
The collector of the different name termination primary side switch pipe of transformer primary winding, the emitter of primary side switch pipe connect DC power supply respectively
The output end of cathode and input capacitance；Each inverter bridge leg includes two switching tubes, and the collector of first switch tube is as inverse
Become the positive input terminal of bridge arm, the emitter of first switch tube and the collector of second switch connect and compose the output of inverter bridge leg
End, negative input end of the emitter of second switch as inverter bridge leg；Emitter, the intermediate dc bus electricity of secondary-side switch pipe
The input terminal of appearance is connected with the positive input terminal of inverter bridge leg, the output of the negative input end, intermediate dc bus capacitor of inverter bridge leg
End is connected with the Same Name of Ends of isolating transformer vice-side winding, the collection of the different name termination secondary-side switch pipe of isolating transformer vice-side winding
Electrode；The output of first inverter bridge leg and the second inverter bridge leg terminates filter circuit；It further include by auxiliary switch, two poles of auxiliary
The auxiliary circuit that pipe and auxiliary capacitor are constituted, wherein auxiliary switch includes two switching tubes, and booster diode includes two two
Pole pipe, the cathode of the first booster diode connect the emitter of DC power anode and the first auxiliary switch, the first auxiliary respectively
The anode of diode connects the emitter of the second auxiliary switch and the output end of auxiliary capacitor, the input terminal point of auxiliary capacitor respectively
Do not connect the collector of the first auxiliary switch and the cathode of the second booster diode, it is the anode of the second booster diode, second auxiliary
The collector of switching tube and the collector of primary side switch pipe is helped to be connected.
A kind of control method of leakage inductance energy feedback type Ripple Suppression inverter, wherein the control method of inverter bridge leg is
Traditional single stage PWM modulation；It is further comprising the steps of:
Step A detects auxiliary capacitor voltage signal, intermediate dc bus voltage signal, the input current letter of inverter bridge leg
Number；
Step B, the auxiliary capacitor voltage signal that step A is obtained pass through low-pass filter, obtain its DC component；
Step C calculates the difference of auxiliary capacitor voltage reference signal and auxiliary capacitor voltage signal DC component；
The voltage difference that step C is obtained is adjusted step D with PI controller, obtains auxiliary capacitor voltage disturbance letter
Number；
Step E calculates the difference of intermediate dc bus voltage reference signal and intermediate dc bus voltage signal；
The voltage difference that step E is obtained is adjusted step F with PI controller, is obtained intermediate dc bus voltage and is disturbed
Dynamic signal；
Step G, by the input current signal of the obtained intermediate dc bus voltage signal and inverter bridge leg of step A, step D
Obtained auxiliary capacitor voltage disturbance signal, the intermediate dc bus voltage disturbance signal input current benchmark that step F is obtained are raw
At module, primary current reference signal and secondary current reference signal are obtained；
The obtained primary current reference signal of step G and secondary current reference signal input modulating wave are generated mould by step H
Block obtains the first, second, third modulation wave signal；
Aforementioned first, second modulation wave signal is inputted pwm control circuit respectively, obtains the first, second logic by step I
Signal；
Step J, the third modulation wave signal that step H is obtained input zero-crossing comparator, obtain third logical signal；
Step K, by aforementioned first logical signal input logic circuit, after first passing through logic inverter in logic circuits, then
By logic inverter, the control signal of primary side switch pipe is obtained；
Aforementioned first, second, third logical signal is distinguished into input logic circuit, first, second is patrolled in logic circuits
Volume signal passes through logic XOR gate, and third logical signal is another to play access logical AND gate after logic inverter, obtain first,
The control signal of second auxiliary switch；
Aforementioned first, second, third logical signal is distinguished into input logic circuit, first, second is patrolled in logic circuits
Volume signal is after logic XOR gate and third logical signal accesses logical AND gate together, then with the first logical signal, first
The control signal of auxiliary switch accesses logic nor gate together, obtains the control signal of secondary-side switch pipe；
The utility model has the advantages that
The present invention discloses a kind of leakage inductance energy feedback type Ripple Suppression inverter and its control methods, and which inhibits direct currents
Mains input side low-frequency ripple electric current can extend the service life of system, and provide feedback access for transformer leakage inductance energy.This
Technical characteristics of the invention compared with original technology are, by the way that auxiliary circuit is added come processing power in flyback converter primary side
It pulses, two double-frequency fluctuations are presented in voltage on auxiliary capacitor, and input current is substantially free of low-frequency ripple, thus direct current input side
It can be to avoid using the electrolytic capacitor that volume is big, reliability is low, and further increased by the energy in recycling transformer leakage inductance
The performance and efficiency of inverter.
Detailed description of the invention
Attached drawing 1 is the inverter circuit structural schematic diagram that LC series resonant circuit is added.
Attached drawing 2 is a kind of power regulating system structural schematic diagram for inhibiting input current ripple.
Attached drawing 3 is the knot of a kind of leakage inductance energy feedback type Ripple Suppression converter main circuit of the invention and its control method
Structure schematic diagram.
Attached drawing 4 is the further equivalent circuit diagram of a kind of leakage inductance energy feedback type Ripple Suppression inverter of the invention.
Attached drawing 5 is a kind of leakage inductance energy feedback type Ripple Suppression inverter key operation waveforms schematic diagram of the invention.
6~attached drawing of attached drawing 10 is that a kind of each switch mode of leakage inductance energy feedback type Ripple Suppression inverter of the invention is shown
It is intended to.
Attached drawing 11 is that the present invention is applied to current simulations waveform when output voltage 220V/50Hz occasion lower die Formulas I.
Attached drawing 12 is that the present invention is applied to current simulations waveform when output voltage 220V/50Hz occasion lower die Formula II.
Attached drawing 13 is that the present invention is applied to input current under output voltage 220V/50Hz occasion, auxiliary capacitor voltage, secondary side
The simulation waveform of electric current and output voltage.
Primary symbols title in above-mentioned attached drawing: Vi, supply voltage.Ci, input capacitance.Sp1、Sp2, be primary side switch
Pipe.Ss, secondary-side switch pipe.Sx1、Sx2, be auxiliary switch.Dsp1、Dsp2、Dsx1、Dsx2、Ds1~Ds4, be body diode.
Dx1、Dx2, be booster diode.D1、D2, be rectifier diode.Cx、Cx1、Cx2, be auxiliary capacitor.C1、C2, boosting electricity
Hold.T, isolating transformer.N1、Np1、Np2, isolating transformer primary side winding.N2, isolating transformer vice-side winding.Lb, Boost liter
Voltage inductance.Lx1、Lx2, be auxiliary induction.Lm, isolating transformer magnetizing inductance.Llk, isolating transformer leakage inductance.Cdc, it is intermediate straight
Flow bus capacitor.S1~S4, be power switch tube.Lf, filter inductance.Cf, filter capacitor.RL, load.Vdc, intermediate dc it is female
Line voltage.vx, auxiliary capacitor voltage.Grid, power grid.vo, output voltage.
Specific embodiment
The technical solution of invention is described in detail with reference to the accompanying drawing:
Attached drawing 3 is the structural representation of a kind of leakage inductance energy feedback type Ripple Suppression converter main circuit and its control method
Figure.By DC power supply Vi, input capacitance 1, primary side switch pipe 2, isolating transformer 3, secondary-side switch pipe 4, intermediate dc bus electricity
Hold 5, two inverter bridge legs 6 and 7, filter circuit 8, auxiliary switch 9, booster diode 10 and auxiliary capacitor 11 to form.SpIt is
Primary side switch pipe, CiIt is input capacitance, Sx1、Sx2It is auxiliary switch, Dx1、Dx2It is booster diode, CxIt is auxiliary capacitor, T is
Isolating transformer, SsIt is secondary-side switch pipe, CdcIt is intermediate dc bus capacitor, S1~S4It is power switch tube, LfIt is output filtering
Inductance, CfIt is output filter capacitor, RLFor load.Since isolating transformer is similar to the ideal with specific magnetizing inductance
Attached drawing 3 can be equivalent to attached circuit shown in Fig. 4 for the ease of analysis by transformer.This inverter is anti-by addition auxiliary circuit
Swash formula DC converter and traditional single-phase full-bridge inverter is constituted, single-phase full-bridge inverter is controlled using SPWM, switching tube S1
And S3Form the first inverter bridge leg of full-bridge inverter, switching tube S2And S4Form the second inverter bridge leg of full-bridge inverter.
Detect auxiliary capacitor voltage signal vx, intermediate dc bus voltage signal Vdc, the input current signal of inverter bridge leg
iinv；By auxiliary capacitor voltage signal vxBy low-pass filter, its DC component V is obtainedx；Calculate auxiliary capacitor Voltage Reference letter
Number Vx-refWith auxiliary capacitor voltage signal DC component VxDifference DELTA Vx；By voltage difference Δ VxIt is adjusted with PI controller,
Obtain auxiliary capacitor voltage disturbance signal；Calculate intermediate dc bus voltage reference signal Vdo-refWith intermediate dc bus voltage
Signal VdcDifference DELTA Vdc；By voltage difference Δ VdcIt is adjusted with PI controller, obtains intermediate dc bus voltage disturbance letter
Number；By intermediate dc bus voltage signal Vdc, inverter bridge leg input current signal iinv, auxiliary capacitor voltage disturbance signal and
Intermediate dc bus voltage disturbance signal input current benchmark generation module obtains primary current reference signal I1-refWith secondary side electricity
Flow reference signal i2-ref；By primary current reference signal I1-refWith secondary current reference signal i2-refIt inputs modulating wave and generates mould
Block obtains the first modulation wave signal M1, the second modulation wave signal M2With third modulation wave signal M3；By the first modulation wave signal M1
With the second modulation wave signal M2Pwm control circuit is inputted respectively, obtains the first logical signal C1With the second logical signal C2；By
Three modulation wave signal M3Zero-crossing comparator is inputted, third logical signal C is obtained3；By the first logical signal C1Input logic circuit,
After first passing through logic inverter in logic circuits, using logic inverter, the control signal S of primary side switch pipe is obtainedp；By first
Logical signal C1, the second logical signal C2With third logical signal C3Distinguish input logic circuit, in logic circuits the first logic
Signal C1With the second logical signal C2By logic XOR gate, third logical signal C3After logic inverter, another access is patrolled
Volume and door, obtain the control signal S of the first, second auxiliary switchx1/Sx2；By the first logical signal C1, the second logical signal C2
With third logical signal C3Distinguish input logic circuit, in logic circuits the first logical signal C1With the second logical signal C2Through
It crosses after logic XOR gate and third logical signal C3Access logical AND gate together, then with the first logical signal C1, first auxiliary
The control signal S of switching tubex1Logic nor gate is accessed together, obtains the control signal S of secondary-side switch pipes；
Below with it is attached it is shown in Fig. 4 it is equivalent after main circuit structure, described in conjunction with 5~attached drawing of attached drawing 10 of the invention specific
Working principle, wherein only DC converter operation mode is analyzed, and the working principle of single-phase full-bridge inverter is no longer superfluous
It states.Since the input power that DC power supply provides is constant, and output power is the pulsating quantity comprising secondary ripple wave, according to defeated
The operating mode for entering the big wisp circuit of power and instantaneous output power is divided into two kinds, when input power is greater than instantaneous output power
When, circuit works in mode I state, and when input power is less than instantaneous output power, circuit works in mode II state.By attached
When inverter known to Fig. 5 works in mode I or mode II, a switch periods have 4 kinds of switch mode, when mode I: [tI0-
tI1]、[tI1-tI2]、[tI2-tI3]、[tI3-tI4], when mode II: [tII0-tII1]、[tII1-tII2]、[tII2-tII3]、[tII3-
tII4], it is defined herein convenient for analyzing: [tI0-tI1] and [tII0-tII1] it is [t0-t1], [tI1-tI2] and [tII1-tII2] it is [t1-
t2], [tI2-tI3] and [tII2-tII3] it is [t2-t3], [tI3-tI4] and [tII3-tII4] it is [t3-t4], wherein in [t0-t1]、
[t2-t3]、[t3-t4] in the moment, mode I is identical as the operation mode of mode II, only in [t1-t2] different in the moment.It is right below
The working condition of each switch mode is made a concrete analysis of.
Before analysis, it first makes the following assumptions: 1. intermediate dc bus voltage VdcFor definite value；2. all power devices are
Preferably；3. the former secondary side turn ratio of isolating transformer are as follows: N1∶N2=1: n.
1. switching 1 [t of mode0-t1] [corresponding to attached drawing 6]
t0Moment, primary side switch pipe SpIt is open-minded, transformer magnetizing inductance LmStart energy storage, primary current ipStart from scratch line
Property rise.This stage, i1=ip。t1Moment, electric current i1Reach reference value I1-ref, on-off switching tube S at this timep, which terminates.
Electric current i1High fdrequency component flow through input capacitance Ci, so input current IiFor a DC quantity.
First modulation wave signal M1It may be expressed as:
Wherein, TsFor switch periods.
2. switching 2 [t of mode1-t2] [corresponding to attached drawing 7,8]
This stage can be divided into mode I and the two different situations of mode II.
Circuit works in mode I (corresponding to attached drawing 7): t1Moment, switching tube SpShutdown, transformer magnetizing inductance electric current warp
Booster diode Dx1, auxiliary capacitor CxAnd booster diode Dx2Afterflow, transformer magnetizing inductance bear backward voltage, due to transformation
The switching frequency of device is high, and auxiliary capacitor voltage can see definite value, primary current i as in a switch periodspLinear decline, when
It drops to reference value ip-refWhen (ip-ref=ni2-ref), secondary-side switch pipe SsIt is open-minded, booster diode Dx1、Dx2It is anti-because bearing
End to voltage, this mode terminates.
Circuit works in mode II (corresponding to attached drawing 8): t1Moment, while opening auxiliary switch Sx1And Sx2, transformer
Magnetizing inductance bears the forward voltage on auxiliary capacitor, primary current ipContinue linear rise, when it rises to reference value ip-ref
When, auxiliary switch Sx1And Sx2It simultaneously turns off, this mode terminates.
Second modulation wave signal M2It may be expressed as:
Third modulation wave signal M3It may be expressed as:
M3=I1-ref-ni2-ref (3)
3. switching 3 [t of mode2-t3] [corresponding to attached drawing 9]
t2Moment opens secondary-side switch pipe Ss, since the voltage of transformer secondary conversion to primary side is less than on auxiliary capacitor
Voltage, booster diode bear backward voltage cut-off, and transformer magnetizing inductance provides energy, while dc-link capacitance to load
Energy storage.In this stage, electric current i2By secondary current reference value i2-refLinearly decrease to zero.
4. switching 4 [t of mode3-t4] [corresponding to attached drawing 10]
t3Moment, electric current i2Drop to zero.In this stage, secondary-side switch pipe SsIt is still connected, but is flowed through without electric current,
Intermediate dc bus capacitor provides output power.t4Moment, secondary-side switch pipe SsShutdown, this operation mode terminates, and the switch
End cycle, into next switch periods.
Figure 11, Figure 12 and Figure 13 are the simulation waveforms that the present invention is applied under output voltage 220V/50Hz occasion.By emulating
Waveform, which can be seen that, can further adjust the current waveform of isolating transformer by introducing auxiliary circuit, so that inverter is handed over
The pulsating power that stream outlet side generates is effectively absorbed, to inhibit inverter direct-current power supply input side low-frequency electrical flow liner
Wave.
From above description it is known that a kind of leakage inductance energy feedback type Ripple Suppression inverter proposed by the present invention and its
Control method has the advantages that following several respects:
1) increased auxiliary circuit effectively inhibits direct current source low-frequency current ripple caused by output ripple power,
Avoid electrolytic capacitor big using volume, that reliability is low.
2) circuit control is simple, Yi Shixian, without sampling transformer primary secondary current.
3) energy feedback further improves the performance and effect of inverter into auxiliary capacitor in isolating transformer leakage inductance
Rate.
Claims (2)
1. a kind of leakage inductance energy feedback type Ripple Suppression inverter, including DC power supply (Vi), input capacitance (1), primary side switch pipe
(2), identical first inverter bridge leg (6) of isolating transformer (3), secondary-side switch pipe (4), intermediate dc bus capacitor (5), structure
With the second inverter bridge leg (7) and filter circuit (8)；Wherein isolating transformer (3) primary side winding Same Name of Ends connects DC power supply respectively
(Vi) anode and input capacitance (1) input terminal, different name termination primary side switch pipe (2) of isolating transformer (3) primary side winding
The emitter of collector, primary side switch pipe (2) meets DC power supply (V respectivelyi) cathode and input capacitance (1) output end；Often
A inverter bridge leg all includes two switching tubes, positive input terminal of the collector of first switch tube as inverter bridge leg, first switch
The emitter of pipe and the collector of second switch connect and compose the output end of inverter bridge leg, the emitter conduct of second switch
The negative input end of inverter bridge leg, the input terminal and inverter bridge of the emitter of secondary-side switch pipe (4), intermediate dc bus capacitor (5)
The positive input terminal of arm connects, the output end and isolating transformer of the negative input end of inverter bridge leg, intermediate dc bus capacitor (5)
(3) the Same Name of Ends connection of vice-side winding, the collector of different name termination secondary-side switch pipe (4) of isolating transformer (3) vice-side winding；
The output of first inverter bridge leg (6) and the second inverter bridge leg (7) terminates filter circuit (8), it is characterised in that:
It further include the auxiliary circuit being made of auxiliary switch (9), booster diode (10) and auxiliary capacitor (11)；Wherein assist
Switching tube (9) includes two switching tubes, and booster diode (10) includes two diodes, and the cathode of the first booster diode is distinguished
Meet DC power supply (Vi) anode and the first auxiliary switch emitter, the anode of the first booster diode connects the second auxiliary respectively
The output end of the emitter and auxiliary capacitor (11) of switching tube, the input terminal of auxiliary capacitor (11) connect the first auxiliary switch respectively
Collector and the second booster diode cathode, the anode of the second booster diode, the second auxiliary switch collector and
The collector of primary side switch pipe (2) is connected.
2. a kind of leakage inductance energy feedback type Ripple Suppression inverter as described in claim 1, wherein the controlling party of inverter bridge leg
Method is traditional single stage PWM modulation；It is characterized in that, the control method of the inverter is further comprising the steps of:
Step A detects auxiliary capacitor voltage signal, intermediate dc bus voltage signal, the input current signal of inverter bridge leg；
Step B, the auxiliary capacitor voltage signal that step A is obtained pass through low-pass filter, obtain its DC component；
Step C calculates the difference of auxiliary capacitor voltage reference signal and auxiliary capacitor voltage signal DC component；
The voltage difference that step C is obtained is adjusted step D with PI controller, obtains auxiliary capacitor voltage disturbance signal；
Step E calculates the difference of intermediate dc bus voltage reference signal and intermediate dc bus voltage signal；
The voltage difference that step E is obtained is adjusted step F with PI controller, obtains intermediate dc bus voltage disturbance letter
Number；
Step G, by the input current signal of the obtained intermediate dc bus voltage signal and inverter bridge leg of step A, step D is obtained
Auxiliary capacitor voltage disturbance signal, intermediate dc bus voltage disturbance signal input current benchmark that step F is obtained generates mould
Block obtains primary current reference signal and secondary current reference signal；
The obtained primary current reference signal of step G and secondary current reference signal are inputted modulating wave generation module by step H,
Obtain the first, second, third modulation wave signal；
Aforementioned first, second modulation wave signal is inputted pwm control circuit respectively, obtains the first, second logical signal by step I；
Step J, the third modulation wave signal that step H is obtained input zero-crossing comparator, obtain third logical signal；
Step K, by aforementioned first logical signal input logic circuit, after first passing through logic inverter in logic circuits, using
Logic inverter obtains the control signal of primary side switch pipe；
Aforementioned first, second, third logical signal is distinguished into input logic circuit, the first, second logic is believed in logic circuits
Number pass through logic XOR gate, third logical signal is another to play access logical AND gate after logic inverter, obtains first, second
The control signal of auxiliary switch；
Aforementioned first, second, third logical signal is distinguished into input logic circuit, the first, second logic is believed in logic circuits
Number after logic XOR gate and third logical signal accesses logical AND gate together, then with the first logical signal, the first auxiliary
The control signal of switching tube accesses logic nor gate together, obtains the control signal of secondary-side switch pipe.
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| CN102522766A (en) * | 2011-11-04 | 2012-06-27 | 浙江大学 | Flyback type miniature photovoltaic grid connected inverter with power decoupling circuit and control method thereof |
| CN103023360A (en) * | 2012-07-03 | 2013-04-03 | 中南大学 | Single-phase alternating current (AC)/ direct current (DC) converter with secondary fluctuating power decoupling and control method thereof |
| CN103401463A (en) * | 2013-07-25 | 2013-11-20 | 天津大学 | Miniature photovoltaic grid-connected inverter with optimized DC (Direct Current) bus capacitor and control method |
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| CN102522766A (en) * | 2011-11-04 | 2012-06-27 | 浙江大学 | Flyback type miniature photovoltaic grid connected inverter with power decoupling circuit and control method thereof |
| CN103023360A (en) * | 2012-07-03 | 2013-04-03 | 中南大学 | Single-phase alternating current (AC)/ direct current (DC) converter with secondary fluctuating power decoupling and control method thereof |
| CN103401463A (en) * | 2013-07-25 | 2013-11-20 | 天津大学 | Miniature photovoltaic grid-connected inverter with optimized DC (Direct Current) bus capacitor and control method |
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