CN103986185A - Photovoltaic grid-connected inverter with active power decoupling function - Google Patents
Photovoltaic grid-connected inverter with active power decoupling function Download PDFInfo
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- CN103986185A CN103986185A CN201410189850.0A CN201410189850A CN103986185A CN 103986185 A CN103986185 A CN 103986185A CN 201410189850 A CN201410189850 A CN 201410189850A CN 103986185 A CN103986185 A CN 103986185A
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Abstract
The invention discloses a photovoltaic grid-connected inverter with the active power decoupling function. The photovoltaic grid-connected inverter comprises a main flyback converter, a power decoupling converter, an inverter circuit and an output filter circuit. Decoupling between the output power of the photovoltaic grid-connected inverter and the output power of a photovoltaic module is achieved, the direct current voltage stabilization function of output of the photovoltaic module can be achieved by applying a non-electrolytic capacitor with small capacity to the direct current input side of the photovoltaic grid-connected inverter, and MPPT efficiency of the photovoltaic module is improved. An electrolytic capacitor is replaced by the non-electrolytic capacitor with high reliability, so that the problem that the overall service life of the photovoltaic grid-connected inverter is short due to use of the electrolytic capacitor is solved. Meanwhile, leakage inductance energy of a transformer can be absorbed and fed back, soft switching of a high-frequency operating switching tube of the main flyback converter is achieved, and conversion efficiency of the inverter is improved.
Description
Technical field
The present invention relates to a kind of photovoltaic combining inverter, be specifically related to a kind of initiatively photovoltaic combining inverter of power decoupled function that has.
Background technology
Solar energy is inexhaustible, and in the 21 century to green energy resource active demand, solar energy power generating will obtain fast development more.Along with the fast development of the grid-connected application of distributed photovoltaic and intelligent grid, family roof and market, business roof are at rapid growth.In middle-size and small-size photovoltaic parallel in system, the direct current energy of directly monolithic photovoltaic module being exported is reverse into AC energy and injects the small-power photovoltaic combining inverter of electrical network, is called grid-connected Miniature inverter.Grid-connected Miniature inverter is particularly suitable for low-power applications occasion, Miniature inverter can be realized component level monitoring, carry out MPPT maximum power point tracking (MPPT) for each block assembly, the output of single component reduces or lost efficacy does not affect whole efficiency, guarantees that system effectiveness maximizes; The strong adaptability of Miniature inverter system to actual environment, relatively low to the coherence request of photovoltaic module, to install, maintenance cost is low, System Expansion flexibility is large, has therefore obtained research widely.
In single-phase grid-connected photovoltaic power generation system, the power output of inverter changes with twice power frequency, and the power output ripple of expecting photovoltaic module is less, to ensure the normal work of photovoltaic module and higher MPPT maximum power point tracking efficiency, must between input and output, add power decoupled device.Present stage, a kind of conventional power decoupled mode was direct current input side the United Nations General Assembly's electrochemical capacitor at photovoltaic combining inverter, but electrochemical capacitor is a complete machine bottleneck in useful life.How to eliminate electrochemical capacitor, replacing with the non-electrolytic capacitor of low capacity, high reliability is a new difficult point; On the other hand, add power decoupling circuit to bring impact to overall efficiency, therefore in solving power decoupled problem, also need to pay close attention to the high efficiency transformation problem of photovoltaic combining inverter.
Summary of the invention
The problem existing in order to solve above-mentioned prior art, the object of the present invention is to provide a kind of initiatively photovoltaic combining inverter of power decoupled function that has, with the non-electrolytic capacitor replacement big capacity electrolyte capacitor of high reliability, low capacity, to solve better the problem in photovoltaic combining inverter reliability and useful life, can effectively absorb fly-back transformer leakage inductance energy, improve conversion efficiency simultaneously.
In order to achieve the above object, the present invention adopts following technical scheme:
There is an initiatively photovoltaic combining inverter for power decoupled function, comprise main anti exciting converter 20, power decoupled converter 10, first order filter capacitor C
o, inverter circuit 30 and output filter circuit 40; The output voltage of photovoltaic module is through a DC side input capacitance C in parallel with photovoltaic array output
inbe connected with the input of main anti exciting converter 20, the input of power decoupled converter 10 respectively afterwards, the output of the output of described main anti exciting converter 20 and described power decoupled converter 10 be connected to each other and with first order filter capacitor C
oinput connect, described first order filter capacitor C
ooutput be connected with the input of inverter circuit 30, the output of described inverter circuit 30 is connected with the input of output filter circuit 40.
Described main anti exciting converter 20 comprises main anti exciting converter main switch S
m2, main anti exciting converter transformer T
2, main anti exciting converter secondary side output rectifier diode D
3, main anti exciting converter active clamping switch tube S
c2with main anti exciting converter active clamp capacitor C
c2; Described main anti exciting converter transformer T
2first side winding Same Name of Ends and positive terminal and the described DC side input capacitance C of photovoltaic module output voltage
inone end and described main anti exciting converter active clamping switch tube S
c2drain electrode be connected, described main anti exciting converter transformer T
2non-same polarity and the described anti exciting converter main switch S of first side winding
m2drain electrode and described main anti exciting converter active clamp capacitor C
c2one end be connected, described main anti exciting converter active clamp capacitor C
c2the other end and described main anti exciting converter active clamping switch tube S
c2source electrode be connected, described main anti exciting converter main switch S
m2source electrode and described DC side input capacitance C
inthe other end and described power decoupled converter main switch S
m1source electrode and the negative pole end of photovoltaic module output voltage be connected, described main anti exciting converter transformer T
2the non-same polarity of secondary side winding and described main anti exciting converter secondary side output rectifier diode D
3anodic bonding, described main anti exciting converter secondary side output rectifier diode D
3negative electrode and described first order filter capacitor C
oone end be connected with described power decoupled converter 10 Circuit Fault on Secondary Transformer Same Name of Ends, described main anti exciting converter 20 secondary side winding Same Name of Ends and described first order filter capacitor C
othe other end and described inverter circuit 30 connect.
Described power decoupled converter 10 comprises power decoupled converter input diode D
s, leakage inductance energy feedback capacitor C
s, power decoupled converter main switch S
m1, power decoupled converter transformer T
1, power decoupled converter secondary side output rectifier diode D
1, power decoupled converter secondary side output switch pipe S
d1, power decoupled converter decoupling zero switching tube S
c1with power decoupled capacitor C
c1; Described power decoupled converter input diode D
sanode and positive terminal and the described leakage inductance energy feedback capacitor C of photovoltaic module output voltage
sone end be connected, power decoupled converter input diode D
snegative electrode and described leakage inductance energy feedback capacitor C
sthe other end and described power decoupled converter transformer T
1same Name of Ends and described power decoupled converter decoupling zero switching tube S
c1drain electrode be connected, described power decoupled converter transformer T
1non-same polarity and the described power decoupled converter main switch S of first side winding
m1drain electrode and described power decoupled capacitor C
c1one end be connected, described power decoupled capacitor C
c1the other end and described power decoupled converter decoupling zero switching tube S
c1source electrode be connected, described power decoupled converter main switch S
m1source electrode and described DC side input capacitance C
inthe other end and described main anti exciting converter main switch S
m2source electrode and the negative pole end of photovoltaic module output voltage be connected, described power decoupled converter transformer T
1the non-same polarity of secondary side winding and described power decoupled converter secondary side output switch pipe S
d1drain electrode connect, described power decoupled converter secondary side output switch pipe S
d1source electrode and power decoupled converter secondary side output rectifier diode D
1negative electrode be connected, described power decoupled converter secondary side output rectifier diode D
1anode be connected with described main anti exciting converter 20 secondary winding Same Name of Ends, described power decoupled converter transformer T
1secondary side winding Same Name of Ends and described main anti exciting converter secondary side output rectifier diode D
3negative electrode and described inverter circuit 30 connect.
Described inverter circuit 30 comprises the first inverter thyristor S
1, the second inverter thyristor S
2, the 3rd inverse switch pipe S
3with the 4th inverse switch pipe S
4; Described the first inverter thyristor S
1anode and described the second thyristor S
2anodic bonding together and with first order filter capacitor C
oone end be connected, described the first inverter thyristor S
1negative electrode and described the 4th inverse switch pipe S
4drain electrode be connected and be connected with an input of described output filter circuit 40, described the second thyristor S
2negative electrode and described the 3rd inverse switch pipe S
3drain electrode be connected and be connected with the another one input of described output filter circuit 40, described the 3rd inverse switch pipe S
3source electrode and described the 4th inverse switch pipe S
4source electrode be connected and with described main anti exciting converter 20 secondary winding Same Name of Ends and described power decoupled converter secondary side output rectifier diode D
1anode be connected.
Described output filter circuit 40 comprises filter capacitor C
o1with filter inductance L
o; Described filter capacitor C
o1one end and described filter inductance L
oone end interconnect and be connected with an output of described inverter circuit 30, described filter capacitor C
o1the other end be connected with another output of described inverter circuit 30 and one end of electrical network, described filter inductance L
othe other end be connected with the other end of electrical network.
Described DC side input capacitance C
in, first order filter capacitor C
o, main anti exciting converter active clamp capacitor C
c2, leakage inductance energy feedback capacitor C
s, power decoupled capacitor C
c1, filter capacitor C
o1for non-electrolytic capacitor.
In the time that the power output of photovoltaic module is greater than the power output of photovoltaic combining inverter, the power output of described main anti exciting converter 20 through inverter circuit 30 and output filter circuit 40 by Energy Transfer to electrical network, also the power output of main anti exciting converter 20 equals the power output of photovoltaic combining inverter; Described power decoupled converter 10 is operated in Buck-Boost pattern, and the surplus power of photovoltaic module output is stored in to described power decoupled capacitor C
c1in, the power output sum of main anti exciting converter 20 and power decoupled converter 10 equals the power output of solar photovoltaic assembly.
In the time that the power output of photovoltaic module is less than the power output of combining inverter, power outputs all photovoltaic module is sent to electrical network by described main anti exciting converter 20, described power decoupled converter 10 is operated in anti exciting converter pattern, will be stored in described power decoupled capacitor C
c1in energy be sent to electrical network, and described main anti exciting converter 20 is sent to power sum that the power of electrical network and described power decoupled converter 10 be sent to electrical network and equals the power output of photovoltaic combining inverter in the course of the work.
Described main anti exciting converter transformer T
2leakage inductance energy through described main anti exciting converter active clamping switch tube S
c2with described main anti exciting converter active clamp capacitor C
c2the branch road forming absorbs feedback; Described power decoupled converter transformer T
1leakage inductance energy in the time that described power decoupled converter 10 is operated in Buck-Boost pattern by described power decoupled converter decoupling zero switching tube S
c1, power decoupled capacitor C
c1the branch road forming absorbs feedback; Described power decoupled converter transformer T
1leakage inductance energy in the time that described power decoupled converter 10 is operated in anti exciting converter pattern through leakage inductance energy feedback capacitor C
s, described DC side input capacitance C
inand described main anti exciting converter main switch S
m2body diode D
m2, body capacitance C
m2feed back to direct-flow input end.
Proposed by the invention have initiatively main feature and the technique effect of the photovoltaic combining inverter of power decoupled function are summarized as follows:
(1) energy of photovoltaic combining inverter output is split as direct current power part and the AC power part that needs decoupling zero by have initiatively topology and the control mode of the photovoltaic combining inverter of power decoupled function that propose, and transmit respectively by main anti exciting converter and power decoupled converter, realize initiatively power decoupled, reach the object of power decoupled, complete the target of removing the large electrochemical capacitor of direct current input side, solved due to the shortcoming that photovoltaic combining inverter reliability is low, useful life is short that exists large electrochemical capacitor to cause.
(2) the main anti exciting converter of photovoltaic combining inverter with active power decoupled function proposing and the staggered work of power decoupled converter, reduced input and output current ripples, is of value to and reduces output current harmonics; Between input and output simultaneously, realize electrical isolation.
(3) the energy high frequency conversion coefficient (by the ratio of the energy of high frequency conversion and DC side input energy) of the photovoltaic combining inverter with active power decoupled function proposing is 1.318, and this is the high frequency conversion coefficient of realizing the needed minimum of power decoupled.The least possible energy high frequency conversion can reduce to greatest extent because high-frequency energy converts the loss in efficiency bringing.
(4) realized absorption and the feedback of all leakage inductance energies in the photovoltaic combining inverter with power decoupled function initiatively, the switching tube of converter primary side no longer needs extra absorption protective circuit; Can realize the soft switch of described main anti exciting converter main switch and described main anti exciting converter active clamping switch tube simultaneously; Improve the power conversion efficiency of photovoltaic combining inverter.
The present invention has realized the power decoupled between photovoltaic combining inverter DC side input power and AC power output, make to adopt the non-electrolytic capacitor of low capacity just can realize the DC voltage-stabilizing effect of photovoltaic module output at photovoltaic combining inverter direct current input side, improved photovoltaic module MPPT maximum power point tracking (MPPT) efficiency; And replaced electrochemical capacitor with the high non-electrolytic capacitor of reliability, solve the difficult problem that photovoltaic combining inverter shortens due to the whole service life that uses electrochemical capacitor to cause; Transformer leakage inductance energy in circuit is realized to absorption feedback simultaneously, and realized the soft switch of main anti exciting converter main switch, improved the power conversion efficiency of photovoltaic combining inverter.
Brief description of the drawings
Fig. 1 is that the present invention has the initiatively photovoltaic combining inverter circuit theory diagrams of power decoupled function.
Fig. 2 be the present invention there is power decoupled function initiatively photovoltaic combining inverter at DC side input power P
pVbe greater than AC power output p
actime circuit working schematic diagram.
Fig. 3 be the present invention there is power decoupled function initiatively photovoltaic combining inverter at DC side input power P
pVbe less than AC power output p
actime circuit working schematic diagram.
Fig. 4 is that the present invention has the initiatively principle schematic of the each power conversion part of photovoltaic combining inverter groundwork electric current within an electrical network cycle of power decoupled function.
Fig. 5 is that the present invention has the main anti exciting converter of photovoltaic combining inverter of power decoupled function initiatively and realizes leakage inductance energy and absorb and the schematic diagram of the soft switching process of high-frequency work switching tube.
Fig. 6 is the groundwork waveform schematic diagram of photovoltaic combining inverter within an electrical network cycle that the present invention has a power decoupled initiatively.
Embodiment
For making those skilled in the art understand better technical scheme of the present invention, below in conjunction with the drawings and specific embodiments, the present invention is had to the initiatively photovoltaic combining inverter of power decoupled function and be described in further detail.
The topological structure of the photovoltaic combining inverter with active power decoupled function of the present invention as shown in Figure 1, comprises main anti exciting converter 20, power decoupled converter 10, first order filter capacitor C
o, inverter circuit 30 and output filter circuit 40.The output voltage of photovoltaic module is through a DC side input capacitance C in parallel with photovoltaic module output
inbe connected with the input of main anti exciting converter 20, the input of power decoupled converter 10 respectively afterwards, the output of main anti exciting converter 20 and power decoupled converter 10 outputs be connected to each other and with first order filter capacitor C
oinput connects, first order filter capacitor C
ooutput be connected with the input of inverter circuit 30, the output of inverter circuit 30 is connected with the input of output filter circuit 40.
In the present embodiment, main anti exciting converter 20 comprises main anti exciting converter main switch S
m2(wherein D
m2, C
m2be respectively S
m2body diode and body capacitance), main anti exciting converter transformer T
2, main anti exciting converter secondary side output rectifier diode D
3, main anti exciting converter active clamping switch tube S
c2, main anti exciting converter active clamp capacitor C
c2; Power decoupled converter 10 comprises power decoupled converter input diode D
s, leakage inductance energy feedback capacitor C
s, power decoupled converter main switch S
m1(wherein D
m1, C
m1be respectively S
m1body diode and body capacitance), power decoupled converter transformer T
1, power decoupled converter secondary side output rectifier diode D
1, power decoupled converter secondary side output switch pipe S
d1(D
d1for S
d1body diode), power decoupled converter decoupling zero switching tube S
c1, power decoupled capacitor C
c1; Inverter circuit 30 comprises the first inverter thyristor S
1, the second inverter thyristor S
2, the 3rd inverse switch pipe S
3, the 4th inverse switch pipe S
4; Output filter circuit 40 comprises filter capacitor C
o1with filter inductance L
o.
The output voltage of photovoltaic module is through a DC side input capacitance C in parallel with photovoltaic module output
in, main anti exciting converter transformer T
2first side winding Same Name of Ends and positive terminal and the DC side input capacitance C of photovoltaic module output voltage
inone end and main anti exciting converter active clamping switch tube S
c2drain electrode be connected, main anti exciting converter transformer T
2non-same polarity and the anti exciting converter main switch S of first side winding
m2drain electrode and main anti exciting converter active clamp capacitor C
c2one end be connected, main anti exciting converter active clamp capacitor C
c2the other end and main anti exciting converter active clamping switch tube S
c2source electrode be connected, main anti exciting converter main switch S
m2source electrode and DC side input capacitance C
inthe other end and power decoupled converter main switch S
m1source electrode and the negative pole end of photovoltaic module output voltage be connected, main anti exciting converter transformer T
2the non-same polarity of secondary side winding and main anti exciting converter secondary side output rectifier diode D
3anodic bonding, main anti exciting converter secondary side output rectifier diode D
3negative electrode and first order filter capacitor C
oone end and power decoupled converter transformer T
1secondary side Same Name of Ends be connected and with inverter circuit 30 in the first inverter thyristor S
1anode, the second inverter thyristor S
2anodic bonding, main anti exciting converter transformer T
2secondary side winding Same Name of Ends and first order filter capacitor C
othe other end and inverter circuit 30 in the 3rd inverse switch pipe S
3source electrode, the 4th inverse switch pipe S
4source electrode connect.Power decoupled converter input diode D
sanode and positive terminal and the leakage inductance energy feedback capacitor C of photovoltaic array output voltage
sone end be connected, power decoupled converter input diode D
snegative electrode and leakage inductance energy feedback capacitor C
sthe other end and power decoupled converter transformer T
1same Name of Ends and power decoupled converter decoupling zero switching tube S
c1drain electrode is connected, power decoupled converter transformer T
1non-same polarity and the power decoupled converter main switch S of first side winding
m1drain electrode and power decoupled capacitor C
c1one end be connected, power decoupled capacitor C
c1the other end and power decoupled converter decoupling zero switching tube S
c1source electrode be connected, power decoupled converter main switch S
m1source electrode and DC side input capacitance C
inthe other end and power decoupled converter main switch S
m1the negative pole end of source electrode and photovoltaic array output voltage is connected, power decoupled converter transformer T
1the non-same polarity of secondary side winding and power decoupled converter secondary side output switch pipe S
d1drain electrode connect, power decoupled converter secondary side output switch pipe S
d1source electrode and power decoupled converter secondary side output rectifier diode D
1negative electrode be connected, power decoupled converter secondary side output rectifier diode D
1anode and main anti exciting converter T
2secondary winding Same Name of Ends be connected and with inverter circuit 30 in the 3rd inverse switch pipe S
3source electrode, the 4th inverse switch pipe S
4source electrode connect, power decoupled converter transformer T
1secondary side winding Same Name of Ends and main anti exciting converter secondary side output rectifier diode D
3negative electrode and inverter circuit 30 in the first inverter thyristor S
1anode, the second inverter thyristor S
2anodic bonding.The first inverter thyristor S in inverter circuit 30
1negative electrode and the 4th inverse switch pipe S
4drain electrode be connected and with output filter circuit 40 in filter capacitor C
o1with filter inductance L
oone end is connected, the second inverter thyristor S
2negative electrode and the 3rd inverse switch pipe S
3drain electrode be connected and with output filter circuit 40 in filter capacitor C
o1the other end and one end of line voltage be connected, the filter inductance L in output filter circuit 40
othe other end is connected with the other end of line voltage.
Power decoupled converter secondary side output switch pipe S in this embodiment
d1, the first inverter thyristor S
1, the second inverter thyristor S
2, the 3rd inverse switch pipe S
3, the 4th inverse switch pipe S
4operating frequency is line voltage frequency, while specifically enforcement, can adopt thyristor or MOSFET; Main anti exciting converter main switch S
m2, main anti exciting converter active clamping switch tube S
c2, power decoupled converter main switch S
m1, power decoupled converter decoupling zero switching tube S
c1for high-frequency work switching tube, while specifically enforcement, can adopt MOSFET.
DC side input capacitance C
in, first order filter capacitor C
o, main anti exciting converter active clamp capacitor C
c2, leakage inductance energy feedback capacitor C
s, power decoupled capacitor C
c1, filter capacitor C
o1deng being non-electrolytic capacitor.
Grid-connected application generally wishes it is that unity power factor is grid-connected, injects electric current and the line voltage same-phase of electrical network.Line voltage, grid-connected current expression formula are respectively:
u
g(t)＝U
g×sin(ω
gt) (1)
i
g(t)＝I
g×sin(ω
gt) (2)
Wherein U
g, I
gbe respectively line voltage peak value and grid-connected current peak value, the power output of combining inverter is:
Can find out, the power average value of injecting electrical network is U
gi
g/ 2, and there is the pulsation of twice power frequency, amplitude is U
gi
g/ 2.And for whole from photovoltaic DC side to grid-connected system, DC side input be an energy stably, be the energy of an alternation in net side.Place of matchmakers proposes to have the initiatively course of work of the photovoltaic combining inverter of power decoupled function below.
As DC side input power P
pVbe greater than AC power output p
actime, circuit working process is as shown in Figure 2.There is initiatively main anti exciting converter 20 and the staggered work of power decoupled converter 10 of the photovoltaic combining inverter of power decoupled function, main anti exciting converter 20 works in active clamp mode of operation, and the power output of main anti exciting converter 20 equals the power output p of photovoltaic combining inverter
ac, main anti exciting converter transformer T
2place branch road leakage inductance energy is through main anti exciting converter active clamping switch tube S
c2with main anti exciting converter active clamp capacitor C
c2the branch road forming absorbs feedback, main anti exciting converter active clamping switch tube S
c2with main anti exciting converter main switch S
m2be operated in ZVS state; Power decoupled converter 10 is operated in Buck-Boost mode of operation, power decoupled converter transformer T
1primary side magnetizing inductance, power decoupled converter main switch S
m1, power decoupled converter decoupling zero switching tube S
c1body diode, stored energy to power decoupled capacitor C
c1form a Buck-Boost converter, by (P
pV-p
ac) power storage to power decoupled capacitor C
c1, power decoupled converter transformer T simultaneously
1the leakage inductance energy of place branch road is along with this natural resonance process is stored in power decoupled capacitor C
c1in.Power decoupled converter decoupling zero switching tube S in this process
c1, power decoupled converter secondary side output switch pipe S
d1keep turn-offing.
As DC side input power P
pVbe less than AC power output p
actime, circuit working process is as shown in Figure 3.Main anti exciting converter 20 and the staggered work of power decoupled converter 10.Main anti exciting converter 20 works in active clamp mode of operation, and its power output equals DC side input power P
pV, main anti exciting converter transformer T
2place branch road leakage inductance energy is through main anti exciting converter active clamping switch tube S
c2with main anti exciting converter active clamp capacitor C
c2the branch road forming absorbs feedback, main anti exciting converter active clamping switch tube S
c2with main anti exciting converter main switch S
m2be operated in ZVS state, as shown in Figure 5; Power decoupled converter 10 is operated in Flyback pattern, power decoupled converter transformer T
1primary side magnetizing inductance, power decoupled converter decoupling zero switching tube S
c1, power decoupled capacitor C
c1, power decoupled converter secondary side output switch pipe S
d1, power decoupled converter secondary side output rectifier diode D
1form a Flyback converter, will be stored in power decoupled capacitor C
c1in energy be sent to secondary side, the simultaneously transformer T of power decoupled converter
1the leakage inductance energy of place branch road is through feedback capacitor C
s, DC side input capacitance C
inand main anti exciting converter main switch S
m2body diode D
m2, body capacitance C
m2feed back to DC side input capacitance C
in.Power decoupled converter main switch S in this process
m1keep off state, power decoupled converter secondary side output switch pipe S
d1keep opening state.
At the positive half cycle of line voltage, the first inverter thyristor S in inverter circuit 30
1with the 3rd inverse switch pipe S
3in opening state, the second inverter thyristor S
2with the 4th inverse switch pipe S
4in off state; At line voltage negative half period, the first inverter thyristor S in inverter circuit 30
1with the 3rd inverse switch pipe S
3in off state, the second inverter thyristor S
2with the 4th inverse switch pipe S
4in opening state.
The power of analyzing known high frequency conversion contains the pulsation of twice power frequency, and amplitude is U
gi
g/ 2, this is the minimum power that will realize the required high frequency conversion of input-output power decoupling zero, has reduced the power loss causing due to HF power conversion.
The photovoltaic combining inverter with active power decoupled function proposed by the invention is in practical work process, adopt digitial controller to realize the control of combining inverter, circuit working is in constant switching frequency discontinuous current pattern (DCM), adopt peak current control to make combining inverter output current and line voltage same-phase, realize unity power factor grid-connected, as shown in Figure 4 and Figure 5.
As shown in Figure 6, the groundwork waveform of described photovoltaic combining inverter within a line voltage cycle.With line voltage angular measure, in steady operation situation, the intersection point of Buck-Boost pattern and Flyback pattern is 45 degree and 135 degree (225 degree and 315 degree).
Above content is general principle of the present invention, principal character and major advantage.Technical staff in the industry should understand; the present invention is not subject to the restriction of above-mentioned embodiment; that in above-mentioned example and specification, describes just illustrates principle of the present invention; under the premise without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in claimed and scope of invention.
Claims (9)
1. there is an initiatively photovoltaic combining inverter for power decoupled function, it is characterized in that: comprise main anti exciting converter (20), power decoupled converter (10), first order filter capacitor (C
o), inverter circuit (30) and output filter circuit (40); The output voltage of photovoltaic module is through a DC side input capacitance (C in parallel with photovoltaic module output
in) after be connected with the input of main anti exciting converter (20), the input of power decoupled converter (10) respectively, the output of the output of described main anti exciting converter (20) and described power decoupled converter (10) be connected to each other and with first order filter capacitor (C
o) input connect, described first order filter capacitor (C
o) output be connected with the input of inverter circuit (30), the output of described inverter circuit (30) is connected with the input of output filter circuit (40).
2. the photovoltaic combining inverter with active power decoupled function according to claim 1, is characterized in that: described main anti exciting converter (20) comprises main anti exciting converter main switch (S
m2), main anti exciting converter transformer (T
2), main anti exciting converter secondary side output rectifier diode (D
3), main anti exciting converter active clamping switch tube (S
c2) and main anti exciting converter active clamp electric capacity (C
c2); Described main anti exciting converter transformer (T
2) first side winding Same Name of Ends and positive terminal and the described DC side input capacitance (C of photovoltaic module output voltage
in) one end and described main anti exciting converter active clamping switch tube (S
c2) drain electrode be connected, the transformer (T of described main anti exciting converter
2) non-same polarity and the described anti exciting converter main switch (S of first side winding
m2) drain electrode and described main anti exciting converter active clamp electric capacity (C
c2) one end be connected, described main anti exciting converter active clamp electric capacity (C
c2) the other end and described main anti exciting converter active clamping switch tube (S
c2) source electrode be connected, described main anti exciting converter main switch (S
m2) source electrode and described DC side input capacitance (C
in) the other end and described power decoupled converter main switch (S
m1) source electrode and the negative pole end of photovoltaic module output voltage be connected, described main anti exciting converter transformer (T
2) non-same polarity and the described main anti exciting converter secondary side output rectifier diode (D of secondary side winding
3) anodic bonding, described main anti exciting converter secondary side output rectifier diode (D
3) negative electrode and described first order filter capacitor (C
o) one end be connected with described power decoupled converter (10) Circuit Fault on Secondary Transformer Same Name of Ends, described main anti exciting converter (20) secondary side winding Same Name of Ends and described first order filter capacitor (C
o) the other end and described inverter circuit (30) connect.
3. the photovoltaic combining inverter with active power decoupled function according to claim 1, is characterized in that: described power decoupled converter (10) comprises power decoupled converter input diode (D
s), leakage inductance energy feedback electric capacity (C
s), power decoupled converter main switch (S
m1), power decoupled converter transformer (T
1), power decoupled converter secondary side output rectifier diode (D
1), power decoupled converter secondary side output switch pipe (S
d1), power decoupled converter decoupling zero switching tube (S
c1) and power decoupled electric capacity (C
c1); Described power decoupled converter input diode (D
s) anode and positive terminal and the described leakage inductance energy feedback electric capacity (C of photovoltaic module output voltage
s) one end be connected, power decoupled converter input diode (D
s) negative electrode and described leakage inductance energy feedback electric capacity (C
s) the other end and described power decoupled converter transformer (T
1) Same Name of Ends and described power decoupled converter decoupling zero switching tube (S
c1) drain electrode be connected, described power decoupled converter transformer (T
1) non-same polarity and the described power decoupled converter main switch (S of first side winding
m1) drain electrode and described power decoupled electric capacity (C
c1) one end be connected, described power decoupled electric capacity (C
c1) the other end and described power decoupled converter decoupling zero switching tube (S
c1) source electrode be connected, described power decoupled converter main switch (S
m1) source electrode and described DC side input capacitance (C
in) the other end and described main anti exciting converter main switch (S
m2) source electrode and the negative pole end of photovoltaic module output voltage be connected, described power decoupled converter transformer (T
1) non-same polarity and the described power decoupled converter secondary side output switch pipe (S of secondary side winding
d1) drain electrode connect, described power decoupled converter secondary side output switch pipe (S
d1) source electrode and power decoupled converter secondary side output rectifier diode (D
1) negative electrode be connected, described power decoupled converter secondary side output rectifier diode (D
1) anode be connected with described main anti exciting converter (20) secondary winding Same Name of Ends, described power decoupled converter transformer (T
1) secondary side winding Same Name of Ends and described main anti exciting converter secondary side output rectifier diode (D
3) negative electrode and described inverter circuit (30) connect.
4. the photovoltaic combining inverter of power decoupled according to claim 1, is characterized in that: described inverter circuit (30) comprises the first inverter thyristor (S
1), the second inverter thyristor (S
2), the 3rd inverse switch pipe (S
3) and the 4th inverse switch pipe (S
4); Described the first inverter thyristor (S
1) anode and described the second thyristor (S
2) anodic bonding together and with first order filter capacitor (C
o) one end be connected, described the first inverter thyristor (S
1) negative electrode and described the 4th inverse switch pipe (S
4) drain electrode be connected and be connected with an input of described output filter circuit (40), described the second thyristor (S
2) negative electrode and described the 3rd inverse switch pipe (S
3) drain electrode be connected and be connected with the another one input of described output filter circuit (40), described the 3rd inverse switch pipe (S
3) source electrode and described the 4th inverse switch pipe (S
4) source electrode be connected and with described main anti exciting converter (20) secondary winding Same Name of Ends and described power decoupled converter secondary side output rectifier diode (D
1) anode be connected.
5. the photovoltaic combining inverter with active power decoupled function according to claim 1, is characterized in that: described output filter circuit (40) comprises filter capacitor (C
o1) and filter inductance (L
o); Described filter capacitor (C
o1) one end and described filter inductance (L
o) one end interconnect and be connected with an output of described inverter circuit (30), described filter capacitor (C
o1) the other end be connected with another output of described inverter circuit (30) and one end of electrical network, described filter inductance (L
o) the other end be connected with the other end of electrical network.
6. the photovoltaic combining inverter with active power decoupled function according to claim 1, is characterized in that: described DC side input capacitance (C
in), first order filter capacitor (C
o), main anti exciting converter active clamp electric capacity (C
c2), leakage inductance energy feedback electric capacity (C
s), power decoupled electric capacity (C
c1), filter capacitor (C
o1) be non-electrolytic capacitor.
7. the photovoltaic combining inverter of power decoupled according to claim 1, it is characterized in that: in the time that the power output of photovoltaic module is greater than the power output of photovoltaic combining inverter, the power output of described main anti exciting converter (20) through inverter circuit (30) and output filter circuit (40) by Energy Transfer to electrical network, also the power output of main anti exciting converter (20) equals the power output of photovoltaic combining inverter, described power decoupled converter (10) is operated in Buck-Boost pattern, the surplus power of photovoltaic module output is stored in to described power decoupled electric capacity (C
c1) in, the power output sum of main anti exciting converter (20) and power decoupled converter (10) equals the power output of photovoltaic module.
8. the photovoltaic combining inverter with active power decoupled function according to claim 1, it is characterized in that: in the time that the power output of photovoltaic module is less than the power output of combining inverter, the power of all photovoltaic module output is sent to electrical network by described main anti exciting converter (20), described power decoupled converter (10) is operated in anti exciting converter pattern, will be stored in described power decoupled electric capacity (C
c1) in energy be sent to electrical network.Described main anti exciting converter (20) is sent to power sum that the power of electrical network and described power decoupled converter (10) be sent to electrical network and equals the power output of photovoltaic combining inverter.
9. the photovoltaic combining inverter with active power decoupled function according to claim 1, is characterized in that described main anti exciting converter transformer (T
2) leakage inductance energy through described main anti exciting converter active clamping switch tube (S
c2) and described main anti exciting converter active clamp electric capacity (C
c2) form branch road absorb feedback; Described power decoupled converter transformer (T
1) leakage inductance energy in the time that described power decoupled converter (10) is operated in Buck-Boost pattern by described power decoupled converter decoupling zero switching tube (S
c1), power decoupled electric capacity (C
c1) form branch road absorb feedback; Described power decoupled converter transformer (T
1) leakage inductance energy in the time that described power decoupled converter (10) is operated in anti exciting converter pattern through leakage inductance energy feedback electric capacity (C
s), described DC side input capacitance (C
in) and described main anti exciting converter main switch (S
m2) body diode (D
m2), body capacitance (C
m2) feed back to direct-flow input end.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106452391A (en) * | 2015-08-07 | 2017-02-22 | 联发科技股份有限公司 | Apparatus for performing signal driving in an electronic device with aid of different types of decoupling capacitors for pre-driver and post-driver |
| CN106787873A (en) * | 2017-03-01 | 2017-05-31 | 华东交通大学 | A kind of power decoupling circuit of AC coupling |
| CN107990412A (en) * | 2017-11-22 | 2018-05-04 | 深圳市中航三鑫光伏工程有限公司 | Photovoltaic air purifier |
| CN108599134A (en) * | 2018-04-24 | 2018-09-28 | 中南民族大学 | Variable capacitance circuit and implementation method for intelligent grid |
| CN115995986A (en) * | 2023-03-24 | 2023-04-21 | 安徽微伏特电源科技有限公司 | Series-parallel flyback boost circuit topology with triangular structure |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101841252A (en) * | 2010-05-11 | 2010-09-22 | 英伟力新能源科技(上海)有限公司 | Photovoltaic grid-connected inverter for active energy decoupling |
| CN202167862U (en) * | 2011-07-05 | 2012-03-14 | 浙江昱能光伏科技集成有限公司 | Grid-connected solar photovoltaic staggered parallel flyback inverter |
| 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 |
| CN102570891A (en) * | 2012-01-16 | 2012-07-11 | 浙江大学 | Flyback photovoltaic grid-connected inverter adopting interleaving parallel-connection active clamping technology |
-
2014
- 2014-05-06 CN CN201410189850.0A patent/CN103986185B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101841252A (en) * | 2010-05-11 | 2010-09-22 | 英伟力新能源科技(上海)有限公司 | Photovoltaic grid-connected inverter for active energy decoupling |
| CN202167862U (en) * | 2011-07-05 | 2012-03-14 | 浙江昱能光伏科技集成有限公司 | Grid-connected solar photovoltaic staggered parallel flyback inverter |
| 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 |
| CN102570891A (en) * | 2012-01-16 | 2012-07-11 | 浙江大学 | Flyback photovoltaic grid-connected inverter adopting interleaving parallel-connection active clamping technology |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106452391A (en) * | 2015-08-07 | 2017-02-22 | 联发科技股份有限公司 | Apparatus for performing signal driving in an electronic device with aid of different types of decoupling capacitors for pre-driver and post-driver |
| CN106452391B (en) * | 2015-08-07 | 2019-02-15 | 联发科技股份有限公司 | For carrying out the decoupling capacitance circuit and device of signal driving in the electronic device |
| CN106787873A (en) * | 2017-03-01 | 2017-05-31 | 华东交通大学 | A kind of power decoupling circuit of AC coupling |
| CN106787873B (en) * | 2017-03-01 | 2023-06-30 | 华东交通大学 | Alternating current side coupled power decoupling circuit |
| CN107990412A (en) * | 2017-11-22 | 2018-05-04 | 深圳市中航三鑫光伏工程有限公司 | Photovoltaic air purifier |
| CN108599134A (en) * | 2018-04-24 | 2018-09-28 | 中南民族大学 | Variable capacitance circuit and implementation method for intelligent grid |
| CN108599134B (en) * | 2018-04-24 | 2020-04-21 | 中南民族大学 | Variable capacitor circuit for smart grid and implementation method |
| CN115995986A (en) * | 2023-03-24 | 2023-04-21 | 安徽微伏特电源科技有限公司 | Series-parallel flyback boost circuit topology with triangular structure |
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| CN103986185B (en) | 2015-12-02 |
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Address after: Four Shaanxi high tech Zone Shanglinyuan road 710119 Xi'an City No. 70 Patentee after: TBEA SunOasis Co.,Ltd. Patentee after: TBEA Xinjiang New Energy Co., Ltd. Address before: 830011 No. 399 South Changchun Road, the Xinjiang Uygur Autonomous Region, Urumqi Patentee before: TBEA Xinjiang New Energy Co., Ltd. Patentee before: TBEA SunOasis Co.,Ltd. |