CN108111037B - One kind zero inputs ripple inverter and its control method - Google Patents
One kind zero inputs ripple inverter and its control method Download PDFInfo
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- CN108111037B CN108111037B CN201611085700.0A CN201611085700A CN108111037B CN 108111037 B CN108111037 B CN 108111037B CN 201611085700 A CN201611085700 A CN 201611085700A CN 108111037 B CN108111037 B CN 108111037B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/505—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/515—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/305—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a thyratron or thyristor type requiring extinguishing means
- H02M3/315—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
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Abstract
The invention discloses one kind zero to input ripple inverter and its control method.The main circuit topology of the inverter includes DC power supply, input capacitance, primary side switch pipe, isolating transformer, hold-off diode, filter capacitor, polarity reversion inverter bridge, output filter circuit, power grid and decoupling circuit；Its control method are as follows: line voltage sampled value obtains and its sine wave with frequency with phase through PLL, input voltage and current sampling data are through the maximum DC input power of MPPT acquisition, five modulation wave signals are obtained by benchmark generation module and modulating wave generation module again, finally by comparator and logic circuit, to control gird-connected inverter work.The present invention joined the decoupling circuit being made of decoupling switch pipe, decoupling diode, decoupling inductance and decoupling capacitance in isolating transformer primary side and increase transformer auxiliary winding, effectively realizes grid-connected and DC power supply terminal Harmonics of Input and inhibits dual function.
Description
Technical field
The present invention relates to one kind zero to input ripple inverter and its control method, belongs to miniature, gird-connected inverter, utilizes
Increased decoupling circuit and auxiliary winding realize the elimination of low-frequency ripple component in DC supply input electric current.
Background technique
In recent years, energy shortage and problem of environmental pollution receive the extensive concern of people, the new energy such as photovoltaic power generation, wind-powered electricity generation
Source electricity generation system with its cleaning, it is efficient, sustainable the advantages that, it has also become the hot spot that academia and industry are currently studied energetically,
And propose a series of schemes and product.For this grid-connected power generation system, contain in gird-connected inverter output power twice
In the power ripple of network voltage frequency, which will necessarily feed back DC power supply terminal, so that containing in input current
A large amount of low-frequency ripple component, for photovoltaic module, it will its MPPT maximum power point tracking is influenced, system effectiveness is reduced, because
This solves the problems, such as that the low-frequency ripple in grid-connected power generation system input current has a very important significance.Pass through large capacity in parallel
Electrolytic capacitor can effectively filter out low-frequency ripple, but required capacitor's capacity will be very big, seriously affect the power of system
Density, and the disadvantages such as electrolytic capacitor has the service life short, and reliability is low.Parallel LC resonance circuit in circuit, and by its resonance
Frequency Design is twice of network voltage frequency, also can effectively filter out low-frequency ripple component, but resonance used by the program
Inductance inductance value and resonance capacitor's capacity are bigger, reduce the power density of system.To sum up, these pass through passive device
Method to eliminate low-frequency ripple component in input current, there is volumes it is larger, reliability is lower the problems such as.It explores thus new
Method, including new topological project, control strategy etc., so that low-frequency ripple component is not contained in DC side input current, thus
Electrolytic capacitor can be substituted using the thin-film capacitor of service life length, high reliablity, be of great significance.
Summary of the invention
It is an object of the invention to provide one kind zero for technological deficiency present in above-mentioned inverter to input ripple inversion
Device and its control method can effectively be disappeared using this inverter and its control method for increasing decoupling circuit and auxiliary winding
Except the low-frequency ripple component in power end input current, it is no longer necessary to which the electrolytic capacitor big using volume, the service life is short improves inversion
The reliability of device.
The present invention to achieve the above object, adopts the following technical scheme that
One kind zero of the invention inputs ripple inverter, including DC power supply, input capacitance, isolating transformer, primary side are opened
Guan Guan, hold-off diode, filter capacitor, polarity reversion inverter bridge, filter circuit and power grid, wherein the anode of DC power supply connects defeated
Enter one end of capacitor, the cathode of DC power supply connects the other end of input capacitance and the emitter of primary side switch pipe respectively, and primary side is opened
The collector for closing pipe connects the primary side winding different name end of isolating transformer, and polarity reversion inverter bridge includes that two thyristors and two open
The anode of Guan Guan, the anode of the first thyristor and the second thyristor, which is connected, constitutes the positive input terminal of polarity reversion inverter bridge, and first
The emitter of switching tube is connected with the emitter of second switch constitutes the negative input end of polarity reversion inverter bridge, the first thyristor
Cathode be connected with the collector of first switch tube constitute polarity reversion inverter bridge positive output end, the cathode of the second thyristor and
The collector of second switch, which is connected, constitutes the negative output terminal of polarity reversion inverter bridge, isolating transformer vice-side winding it is non-of the same name
End is connected with the anode of hold-off diode, and the Same Name of Ends of isolating transformer vice-side winding, one end of filter capacitor and polarity are anti-
The negative input end for turning inverter bridge is connected, and the cathode of hold-off diode, the other end of filter capacitor and polarity invert inverter bridge
Positive input terminal is connected, and output filter circuit includes an output inductor and an output filter capacitor, exports filtered electrical
One end of sense, output filter capacitor one end be connected with the positive output end of polarity reversion inverter bridge, output inductor it is another
One end is connected with one end of power grid, and the other end of power grid, the other end of output filter capacitor and polarity invert the negative of inverter bridge
Output end is connected, and further includes isolating transformer auxiliary winding and decoupling circuit, wherein decoupling circuit includes decoupling inductance, decoupling
Capacitor, two decoupling diodes and two decoupling switch pipes, the sun of the collector of the first decoupling switch pipe, the first decoupling diode
Pole is connected with the anode of DC power supply, and the cathode of the first decoupling diode is connected with the Same Name of Ends of isolating transformer primary side winding
It connects, the emitter of the first decoupling switch pipe, the second cathode for decoupling diode are connected with one end of decoupling inductance, DC power supply
Cathode, decouple the other end of inductance, one end of decoupling capacitance is connected with the Same Name of Ends of isolating transformer auxiliary winding, be isolated
The different name end of transformer auxiliary winding is connected with the collector of the second decoupling switch pipe, the emitter of the second decoupling switch pipe,
The anode of the other end of decoupling capacitance and the second decoupling diode is connected.
The described zero input ripple inverter control method the following steps are included:
Step A detects mains voltage signal, input voltage signal, input current signal, decoupling capacitance voltage signal；
Step B, the mains voltage signal that step A is obtained input PLL module, obtain the list with network voltage with frequency with phase
Position sine wave signal；
The obtained input voltage signal of step A and input current signal are accessed MPPT module by step C, are obtained maximum straight
Flow input power；
Step D, the decoupling capacitance voltage signal that step A is obtained pass through low-pass filter, obtain its DC component；
Step E, the difference of computation decoupling capacitance voltage reference signal and decoupling capacitance voltage DC component；
Step F obtains obtained unit sine wave signal, the step C of decoupling capacitance voltage signal that step A is obtained, step B
To maximum DC input power input reference generation module obtains primary current benchmark and input current benchmark together；
Step G, the voltage difference that step E is obtained are added on primary current benchmark after pi regulator, are obtained practical
Primary current benchmark；
Step H, the practical primary current benchmark access modulation that input current benchmark and step G that step F is obtained are obtained
Wave generation module obtains the first, second, third, fourth, the 5th modulation wave signal；
Step I, by the first, second, third, fourth, the 5th modulation wave signal that step H is obtained and the electricity that step A is obtained
Net voltage signal is respectively connected to comparator, and wherein mains voltage signal and the first modulation wave signal are made comparisons with zero level, second,
Third, the four, the 5th modulation wave signals are made comparisons with carrier wave, are obtained the six, the first, second, third, fourth, the 5th respectively and are patrolled
Collect signal；
Step J, by aforementioned 6th logical signal input logic circuit, the 6th logical signal is first directly defeated in logic circuits
The first thyristor of polarity reversion inverter bridge and the control signal of second switch are obtained out, obtain polarity using logic inverter
Invert the second thyristor of inverter bridge and the control signal of first switch tube；
Aforementioned first, second, the 4th logical signal is distinguished into input logic circuit, in logic circuits the first logical signal
After access logic inverter and the 4th logical signal accesses logical AND gate together, while the first and second logical signals access logic
Logic sum gate is accessed together with door, then the signal that logical AND gate is obtained, and obtains the control signal of primary side switch pipe；
Aforementioned first, second, third logical signal is distinguished into input logic circuit, first and second is patrolled in logic circuits
After collecting signal access logical AND gate, then logic inverter is accessed, while first, third logical signal accesses logical AND gate together, so
Afterwards the signal of acquisition is accessed into logical AND gate together, obtains the control signal of the first decoupling switch pipe；
Aforementioned first, the four, the 5th logical signals are distinguished into input logic circuit, in logic circuits the first logical signal
After access logic inverter and the 4th logical signal access logical AND gate together, believe using logic inverter, while by the first logic
Number after logic inverter and the 5th logical signal accesses logical AND gate together, and the signal of acquisition is then accessed logical AND together
Door obtains the control signal of the second decoupling switch pipe.
The present invention discloses one kind zero to input ripple inverter and its control method, eliminates DC supply input electric current
In low-frequency ripple component.Technical characteristics of the present invention compared with original technology are, by the way that power ripple is transferred to solution
On coupling capacitor, realize the elimination of the low-frequency ripple component in power end input current, can be avoided in system it is big using volume,
The low electrolytic capacitor of reliability.
Detailed description of the invention
Attached drawing 1 is the structural schematic diagram that one kind zero of the invention inputs ripple converter main circuit and its control method.
Attached drawing 2 is that one kind zero of the invention inputs the further equivalent circuit diagram of ripple inverter.
3~attached drawing of attached drawing 4 is that one kind zero of the invention inputs two kinds of key operation waveforms schematic diagrames of ripple inverter.
5~attached drawing of attached drawing 10 is each switch mode schematic diagram that one kind zero of the invention inputs ripple inverter.
Attached drawing 11 is that the present invention is applied to the input current of 110V/50Hz AC network, decoupling inductive current, decoupling capacitance
The simulation waveform of voltage, grid-connected current and network voltage.
Primary symbols title in above-mentioned attached drawing: Vin, supply voltage.Cin, input capacitance.Sp, primary side switch pipe.Lx, solution
Coupling inductance.Cx, decoupling capacitance.Sx1、Sx2, be decoupling switch pipe.Dx1、Dx2, be decoupling diode.T, isolating transformer.
n1, isolating transformer primary side winding.n2, isolating transformer vice-side winding.nx, isolating transformer auxiliary winding.Lm, isolation transformation
Device magnetizing inductance.D1, hold-off diode.Co, filter capacitor.St1、St2, be thyristor.Ss1、Ss2, be switching tube.Lf, it is defeated
Filter inductance out.Cf, output filter capacitor.vgrid, network voltage.
Specific embodiment
The technical solution of invention is described in detail with reference to the accompanying drawing:
It is attached it is shown in FIG. 1 be structural schematic diagram that one kind zero inputs ripple converter main circuit and its control method.Zero is defeated
Enter ripple converter main circuit by DC power supply, input capacitance 1, isolating transformer 2, primary side switch pipe 3, hold-off diode 4, filter
Wave capacitor 5, polarity reversion inverter bridge 6, filter circuit 7, power grid 8 and decoupling circuit 9 form.CinIt is input capacitance, T is that isolation becomes
Depressor, SpIt is primary side switch pipe, Sx1、Sx2It is decoupling switch pipe, LxIt is decoupling inductance, Dx1、Dx2It is decoupling diode, CxIt is decoupling
Capacitor, D1It is off diode, CoIt is filter capacitor, St1、St2It is thyristor, Ss1、Ss2It is switching tube, LfIt is output filtered electrical
Sense, CfIt is output filter capacitor, vgridIt is network voltage.There is specific magnetizing inductance since isolating transformer is similar to one
The inverter of attached drawing 1 can be equivalent to attached circuit shown in Fig. 2 for the ease of analysis by ideal transformer.
Detect mains voltage signal vgrid, input voltage signal Vin, input current signal Iin, decoupling capacitance voltage signal
vx；By mains voltage signal vgridPLL module is inputted, the unit sine wave signal sin ω t with network voltage with frequency with phase is obtained；
By input voltage signal VinWith input current signal IinMPPT module is accessed, maximum DC input power P is obtainedin；It will decoupling electricity
Hold voltage signal vxBy low-pass filter, its DC component V is obtainedx；Computation decoupling capacitance voltage reference signal Vx_refWith it
DC component VxDifference DELTA vx；By decoupling capacitance voltage signal vx, unit sine wave signal sin ω t, maximum direct current input work
Rate PinInput reference generation module obtains primary current benchmark i togetherp-refWith input current benchmark I1-ref；By voltage difference Δ
vxAfter pi regulator, it is added in primary current benchmark ip-refOn, obtain practical primary current benchmark ip-r；By input current base
Quasi- I1-refWith practical primary current benchmark ip-rModulating wave generation module is accessed, modulation wave signal M is obtained1、M2、M3、M4And M5；It will
Modulation wave signal M1、M2、M3、M4、M5And mains voltage signal vgridIt is respectively connected to comparator, wherein mains voltage signal vgridWith
Modulation wave signal M1It makes comparisons with zero level, modulation wave signal M2、M3、M4、M5It makes comparisons with carrier wave, to obtain logical signal
C6、C1、C2、C3、C4And C5；By logical signal C6Input logic circuit, in logic circuits logical signal C6First directly output obtains
The thyristor S of polarity reversion inverter bridget1With switching tube Ss2Control signal, using logic inverter obtain polarity reversion inversion
The thyristor S of bridget2With switching tube Ss1Control signal；By logical signal C1、C2And C4Input logic circuit respectively, in logic electricity
Logical signal C in road1Access logic inverter after and logical signal C4Logical AND gate, while logical signal C are accessed together1And C2It connects
Enter logical AND gate, then the signal that logical AND gate is obtained accesses logic sum gate together, obtains primary side switch pipe SpControl signal；
By logical signal C1、C2、C3Distinguish input logic circuit, in logic circuits logical signal C1、C2After accessing logical AND gate, then connect
Enter logic inverter, while logical signal C1、C3Logical AND gate is accessed together, and the signal of acquisition is then accessed into logical AND gate together,
Obtain decoupling switch pipe Sx1Control signal；By logical signal C1、C4And C5Input logic circuit respectively, is patrolled in logic circuits
Collect signal C1Access logic inverter and logical signal C4After accessing logical AND gate together, using logic inverter, while by logic
Signal C1After logic inverter and C5Logical AND gate is accessed together, the signal of acquisition is then accessed into logical AND gate together, is obtained
Decoupling switch pipe Sx2Control signal.
Below with it is attached it is shown in Fig. 2 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 flyback converter operation mode is analyzed, and the working principle of polarity reversion inverter bridge is no longer superfluous
It states.Since the input power that DC power supply provides is a DC quantity, and output power is the pulsating quantity comprising secondary ripple wave, according to
Input power PinWith instantaneous output power poSize the operating mode of circuit is divided into two kinds: when input power be greater than it is instantaneous defeated
Out when power, circuit works in mode I state, as shown in Fig. 3；When input power is less than instantaneous output power, circuit work
Make in mode II state, as shown in Fig. 4.No matter inverter works in mode I or mould it can be seen from attached drawing 3 and attached drawing 4
When Formula II, a switch periods TsInterior, inverter has 4 kinds of switch mode, [t0-t1]、[t1-t2]、[t2-t3]、[t3-t4].Under
Working condition in face of each switch mode is made a concrete analysis of.
Before analysis, first make the following assumptions: 1. all power devices are ideal；It is pressed in often 2. decoupling capacitance powers on
It is definite value in a HF switch period；3. the isolating transformer turn ratio are as follows: n1∶nx∶n2=1: 1: n.
The working condition that mode is respectively switched under mode I is made a concrete analysis of below.
1. switching 1 [t of mode0-t1] [corresponding to attached drawing 5]
t0Moment opens primary side switch pipe Sp, transformer magnetizing inductance LmBear direct current power source voltage, primary current ipFrom
Zero starts linear rise.Until t1Moment, primary current ipRise to primary current reference value ip-ref, switching tube SpShutdown, this mould
State terminates, and the energy of isolating transformer magnetizing inductance storage at this time, which is equal to, loads required energy, current reference value ip-refIt can
It indicates are as follows:
Wherein, TsFor switch periods.And then available modulating wave M2(t):
2. switching 2 [t of modet-t2] [corresponding to attached drawing 6]
t1Moment, since the energy stored in transformer magnetizing inductance can not be mutated, hold-off diode D1Conducting, excitation
Inductance releases energy to power grid；Meanwhile opening decoupling switch pipe Sx1, decouple inductance LxBecause bearing supply voltage, electric current iLxBy zero
Linear rise, until it reaches decoupling inductive current reference value iLx-ref, decouple inductive current reference value iLx-ref:
And then available modulating wave M3(t):
3. switching 3 [t of mode2-t3] [corresponding to attached drawing 7]
t2Moment turns off decoupling switch pipe Sx1, decouple inductance LxBear backward voltage on decoupling capacitance, electric current iLxBy decoupling
Inductive current reference value iLx-refLinear decline, decoupling capacitance CxStore energy.In attached schematic diagram shown in Fig. 7, hold-off diode
D1It is in the conductive state, but it may also work in off state.
4. switching 4 [t of mode3-t4] [corresponding to attached drawing 8]
t3Moment decouples inductance LxUpper and hold-off diode D1On without electric current, isolating transformer work is completely discontinuously
Mode, filter capacitor CoEnergy needed for maintaining power grid with filter circuit.
The working condition that mode is respectively switched under mode II is made a concrete analysis of below.
1. switching 1 [t of mode0-t1] [corresponding to attached drawing 5]
This process is identical as the switch mode 1 under mode I, switching tube SpOpen-minded, transformer magnetizing inductance bears direct current
Source forward voltage, primary current ipStart from scratch linear rise, until electric current ipRise to input current reference value I1-ref, at this time
Switching tube SpShutdown, ip=i1, input current reference value I1-refIt may be expressed as:
And then available modulating wave M1(t) and M4(t):
M1(t)=I1-ref-ip-ref (6)
2. switching 2 [t of mode1-t2] [corresponding to attached drawing 9]
t1Moment opens decoupling switch pipe Sx2, isolating transformer auxiliary winding bear decoupling capacitance on forward voltage, excitation
Inductance continues energy storage, thus decoupling capacitance electric current ixBy I1-refContinue linear rise, when it rises to decoupling capacitance current reference
Value ix-refWhen, decoupling switch pipe Sx2Shutdown, this mode terminate, at this time ix-ref=ip-ref.Available modulating wave M5(t):
3. switching 3 [t of mode2-t3] [corresponding to attached drawing 10]
In this stage, isolating transformer magnetizing inductance continues to transmit energy to power grid, until secondary current i2Drop to zero.
4. switching 4 [t of mode3-t4] [corresponding to attached drawing 8]
This process is identical as the switch mode 4 under mode 1, filter capacitor CoEnergy needed for providing power grid with filter circuit
Amount.
Figure 11 is the input current I that the present invention is applied to 110V/50Hz AC networkin, decoupling inductive current iLx, decoupling
Capacitance voltage vx, grid-connected current igridAnd network voltage vgridSimulation waveform.By simulation waveform it is found that the present invention can be effective
Eliminate DC power supply terminal input current in low-frequency ripple component.
From above description it is known that a kind of zero input ripple inverter proposed by the present invention and its control method have
The advantages of following several respects:
1) increased decoupling circuit and auxiliary winding can will export brought power ripple and be completely transferred to decoupling electricity
Rong Shang so that two double-frequency fluctuations are presented on decoupling capacitance voltage, and does not contain low-frequency ripple component in input current.
2) control method is relatively simple, is not only able to achieve transformation of electrical energy, but also can eliminate input current ripple, and easily real
It is existing.
3) capacitor in system can be used that capacitance is small, the service life is long, the thin-film capacitor of high reliablity, and extending inverter makes
With the service life, the reliability of system is improved.
Claims (2)
1. one kind zero inputs ripple inverter, including DC power supply (Vin), input capacitance (1), isolating transformer (2), primary side open
Pipe (3), hold-off diode (4), filter capacitor (5), polarity reversion inverter bridge (6), output filter circuit (7) and power grid (8) are closed,
Wherein DC power supply (Vin) anode connect one end of input capacitance (1), the cathode of DC power supply connects the another of input capacitance (1) respectively
The emitter of one end and primary side switch pipe (3), the primary side winding that the collector of primary side switch pipe (3) connects isolating transformer (2) are different
Name end, it includes two thyristors and two switching tubes, the anode of the first thyristor and the second thyristor that polarity, which inverts inverter bridge (6),
Anode be connected and constitute the positive input terminal of polarity reversion inverter bridge (6), the emitter of first switch tube and the hair of second switch
Emitter-base bandgap grading, which is connected, constitutes the negative input end of polarity reversion inverter bridge (6), the cathode of the first thyristor and the collector of first switch tube
It is connected and constitutes the positive output end of polarity reversion inverter bridge (6), the cathode of the second thyristor is connected with the collector of second switch
Constitute the negative output terminal of polarity reversion inverter bridge (6), the non-same polarity and hold-off diode of isolating transformer (2) vice-side winding
(4) anode is connected, and the Same Name of Ends of isolating transformer (2) vice-side winding, one end of filter capacitor (5) and polarity invert inversion
The negative input end of bridge (6) is connected, and the cathode of hold-off diode (4), the other end of filter capacitor (5) and polarity invert inverter bridge
(6) positive input terminal is connected, and output filter circuit (7) includes an output inductor and an output filter capacitor, defeated
Out one end of filter inductance, output filter capacitor the positive output end of one end and polarity reversion inverter bridge (6) be connected, output filter
The other end of wave inductance is connected with the one end of power grid (8), the other end of power grid (8), the other end of output filter capacitor and pole
The negative output terminal of sex reversal inverter bridge (6) is connected, it is characterised in that:
It further include isolating transformer (2) auxiliary winding and decoupling circuit (9), wherein decoupling circuit (9) includes decoupling inductance, decoupling
Capacitor, two decoupling diodes and two decoupling switch pipes, the sun of the collector of the first decoupling switch pipe, the first decoupling diode
Pole and DC power supply (Vin) anode be connected, first decoupling diode cathode and isolating transformer (2) primary side winding it is same
Name end is connected, and the emitter of the first decoupling switch pipe, the second cathode for decoupling diode are connected with one end of decoupling inductance,
The cathode of DC power supply, the other end, one end of decoupling capacitance and the Same Name of Ends of isolating transformer (2) auxiliary winding for decoupling inductance
It is connected, the different name end of isolating transformer (2) auxiliary winding is connected with the collector of the second decoupling switch pipe, and the second decoupling is opened
The anode for closing the emitter of pipe, the other end of decoupling capacitance and the second decoupling diode is connected.
2. zero input ripple inverter as described in claim 1, which is characterized in that the control method of the inverter includes following
Step:
Step A detects mains voltage signal, input voltage signal, input current signal, decoupling capacitance voltage signal；
Step B, the mains voltage signal that step A is obtained input PLL module, obtain with network voltage with frequently with the unit of phase just
String wave signal；
The obtained input voltage signal of step A and input current signal are accessed MPPT module by step C, and it is defeated to obtain maximum direct current
Enter power；
Step D, the decoupling capacitance voltage signal that step A is obtained pass through low-pass filter, obtain its DC component；
Step E, the difference of computation decoupling capacitance voltage reference signal and decoupling capacitance voltage DC component；
Step F obtains obtained unit sine wave signal, the step C of decoupling capacitance voltage signal that step A is obtained, step B
Input reference generation module obtains primary current benchmark and input current benchmark to maximum DC input power together；
Step G, the voltage difference that step E is obtained are added on primary current benchmark after pi regulator, obtain practical primary side
Current reference；
Step H, the practical primary current benchmark access modulating wave that input current benchmark and step G that step F is obtained are obtained are raw
At module, the first, second, third, fourth, the 5th modulation wave signal is obtained；
Step I, by the first, second, third, fourth, the 5th modulation wave signal that step H is obtained and the power grid electricity that step A is obtained
Pressure signal is respectively connected to comparator, and wherein mains voltage signal and the first modulation wave signal are made comparisons with zero level, and second, the
Three, the four, the 5th modulation wave signals are made comparisons with carrier wave, obtain the six, the first, second, third, fourth, the 5th logic respectively
Signal；
Step J, by aforementioned 6th logical signal input logic circuit, the 6th logical signal is first directly exported in logic circuits
To the first thyristor of polarity reversion inverter bridge and the control signal of second switch, polarity reversion is obtained using logic inverter
Second thyristor of inverter bridge and the control signal of first switch tube；
Aforementioned first, second, the 4th logical signal is distinguished into input logic circuit, the first logical signal accesses in logic circuits
After logic inverter and the 4th logical signal accesses logical AND gate together, while the first and second logical signals access logical AND gate,
The signal that logical AND gate is obtained again accesses logic sum gate together, obtains the control signal of primary side switch pipe；
Aforementioned first, second, third logical signal is distinguished into input logic circuit, the first and second logics are believed in logic circuits
After number access logical AND gate, then logic inverter is accessed, while first, third logical signal accesses logical AND gate together, then will
The signal of acquisition accesses logical AND gate together, obtains the control signal of the first decoupling switch pipe；
Aforementioned first, the four, the 5th logical signals are distinguished into input logic circuit, the first logical signal accesses in logic circuits
After logic inverter and the 4th logical signal access logical AND gate together, passed through using logic inverter, while by the first logical signal
It crosses after logic inverter and the 5th logical signal accesses logical AND gate together, the signal of acquisition is then accessed into logical AND gate together,
Obtain the control signal of the second decoupling 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 |
| CN103618470A (en) * | 2013-12-03 | 2014-03-05 | 东南大学 | Photovoltaic grid-connection micro inverter and power decoupling control method |
| CN104901572A (en) * | 2015-06-05 | 2015-09-09 | 上海大学 | High-power-density and long-life fly-back micro photovoltaic grid-connected inverter |
| CN105187005A (en) * | 2015-06-05 | 2015-12-23 | 上海大学 | Miniature photovoltaic inverter with zero input secondary ripple current content |
| CN105450073A (en) * | 2016-01-15 | 2016-03-30 | 安阳师范学院 | A single-phase photovoltaic grid-connected micro-inverter |
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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 |
| CN103618470A (en) * | 2013-12-03 | 2014-03-05 | 东南大学 | Photovoltaic grid-connection micro inverter and power decoupling control method |
| CN104901572A (en) * | 2015-06-05 | 2015-09-09 | 上海大学 | High-power-density and long-life fly-back micro photovoltaic grid-connected inverter |
| CN105187005A (en) * | 2015-06-05 | 2015-12-23 | 上海大学 | Miniature photovoltaic inverter with zero input secondary ripple current content |
| CN105450073A (en) * | 2016-01-15 | 2016-03-30 | 安阳师范学院 | A single-phase photovoltaic grid-connected micro-inverter |
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