CN103606956B - For the power decoupling circuit of photovoltaic combining inverter - Google Patents

For the power decoupling circuit of photovoltaic combining inverter Download PDF

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Publication number
CN103606956B
CN103606956B CN201310631131.5A CN201310631131A CN103606956B CN 103606956 B CN103606956 B CN 103606956B CN 201310631131 A CN201310631131 A CN 201310631131A CN 103606956 B CN103606956 B CN 103606956B
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switching tube
decoupling capacitors
decoupling
power
inductance
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CN103606956A (en
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杨晓光
姜龙斌
冯俊博
梁昊天
孙传杰
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Hebei University of Technology
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Hebei University of Technology
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers

Abstract

The present invention is used for the power decoupling circuit of photovoltaic combining inverter, relates to the circuit arrangement of ac mains or ac distribution network, is made up of a filtering capacitor, inductance, decoupling capacitors A, decoupling capacitors B, switching tube A and a switching tube B, decoupling capacitors A and decoupling capacitors B is in parallel with filtering capacitor after connecting, after switching tube A collector electrode after switching tube A and switching tube B connects is connected to decoupling capacitors A and decoupling capacitors B series connection and on the cathode node of filtering capacitor parallel connection part, after switching tube B emitter after switching tube A and switching tube B connects is connected in decoupling capacitors A and decoupling capacitors B series connection and on the negative pole node of filtering capacitor parallel connection part, the intermediate node that decoupling capacitors A and decoupling capacitors B connects is connected to by inductance on the tie point of switching tube A emitter and switching tube B collector electrode, overcome existing photovoltaic combining inverter and want Large Copacity large volume decoupling capacitance, complex structure and the high defect of cost.

Description

For the power decoupling circuit of photovoltaic combining inverter
Technical field
Technical scheme of the present invention relates to the circuit arrangement of ac mains or ac distribution network, specifically for the power decoupling circuit of photovoltaic combining inverter.
Background technology
In single-phase photovoltaic grid-connected inverter, for making the output power factor of inverter close to 1, need the output current wave of control inverter to be sinusoidal waveform and with line voltage same-phase, this makes the power output of inverter be the pulsating power doubling mains frequency.This pulsating power can produce low-frequency ripple on DC bus, and then causes the fluctuation of voltage and current of photovoltaic array.But, in order to maximally utilise the energy that photovoltaic array sends, photovoltaic array must be made fully to run close to its maximum power point.In order to be limited in the low-frequency ripple that DC bus produces, existing solution is at photovoltaic array two ends and the decoupling capacitance of the United Nations General Assembly, and for the DC bus-bar voltage of 400V, decoupling capacitance is generally 0.5mF/kW.This adds volume and the cost of inverter undoubtedly.In order to reduce the capacity of required decoupling capacitance, have already been proposed multiple power decoupling method.
The method that document " Utility-connected power converter for maximizing power transfer from a photovoltaic source while drawing ripple-free current " proposes increases the voltage fluctuation amplitude of bus capacitor, make the withstand voltage increase of device, thus bring difficulty to the selection of the resistance to voltage capacitance of height, and the life-span of device also can reduce.The method that document " DC bus regulation strategy for grid-connected V power generation system " proposes is by after an inductance and a capacitances in series, be connected in parallel on again on DC bus, utilize the method for LC series resonance can effectively reduce the voltage fluctuation of bus.The value of L and C of this decoupling method is very large, and its resonance current existence produced is fluctuated widely, and add unsteadiness, and this method is not suitable for small-power occasion to system.CN101841252A discloses a kind of photovoltaic combining inverter of active energy decoupling, utilizes the mode of two anti exciting converter shunt capacitances, and the complex structure of its device, volume are large and cost is high; CN102522766A discloses a kind of flyback type miniature photovoltaic grid connected inverter with power decoupling circuit and control method thereof, the complex structure of this inverter, needs three switching tubes, adds control complexity, also increase the volume in decoupling zero loop; CN102638059A reports single-phase grid-connected photovoltaic power generation system power decoupling circuit and control method thereof, the decoupling zero part of this circuit between full-bridge inverting and grid-connected filter, to the designing requirement of grid-connected filter and cost all higher.
In a word, in existing single-phase photovoltaic grid-connected inverter device, still exist and need the defect that the decoupling capacitance of larger capacity and larger volume, complex structure, volume are large and cost is high.
Summary of the invention
Technical problem to be solved by this invention is: the power decoupling circuit being provided for photovoltaic combining inverter, can ensure that DC bus-bar voltage is stabilized in about 400V, overcome in existing grid-connected photovoltaic inverter device and need the defect that the decoupling capacitance of larger capacity and larger volume, complex structure, volume are large and cost is high.
The present invention solves this technical problem adopted technical scheme: for the power decoupling circuit of photovoltaic combining inverter, is made up of a filtering capacitor, inductance, decoupling capacitors A, decoupling capacitors B, switching tube A and a switching tube B, wherein, decoupling capacitors A and decoupling capacitors B is in parallel with filtering capacitor after connecting, the collector electrode of the switching tube A after switching tube A and switching tube B connect be connected to decoupling capacitors A and decoupling capacitors B connect after and filtering capacitor parallel connection part cathode node on, this cathode node is on a DC bus, the emitter of the switching tube B after switching tube A and switching tube B connect be connected in decoupling capacitors A and decoupling capacitors B connect after and filtering capacitor parallel connection part negative pole node on, this negative pole node is then on another DC bus, the intermediate node that decoupling capacitors A and decoupling capacitors B connects is connected on the tie point of switching tube A emitter and switching tube B collector electrode by inductance.
The above-mentioned power decoupling circuit for photovoltaic combining inverter, the capacitance of described filtering capacitor be 22 μ F and withstand voltage be 400V, the inductance value of inductance is 2mH, the capacitance of decoupling capacitors A be 22 μ F and withstand voltage be 172V, the capacitance of decoupling capacitors B be 136 μ F and withstand voltage be 320V, switching tube A and switching tube B all adopts insulated gate bipolar transistor IKP15N65H5.
The above-mentioned power decoupling circuit for photovoltaic combining inverter, wherein involved switching tube, capacitor, inductance are all known, all components and parts can obtain by the known approach such as being purchased, and the connection of all components and parts is also all the line connecting method known by those skilled in the art.
The above-mentioned power decoupling circuit for photovoltaic combining inverter, when being applied in photovoltaic combining inverter, this power decoupling circuit is near the positive and negative end of filtering capacitor and the positive and negative end of photovoltaic array is in parallel is connected on a DC bus again, this power decoupling circuit after switching tube A and switching tube B connect positive and negative end be connected with the positive and negative end of inverter input terminal respectively, inverter output end is connected with electrical network.Decoupling capacitors A and decoupling capacitors B couples together by the bidirectional Buck-Boost converter be made up of two switching tubes and inductance, make energy can between decoupling capacitors A and decoupling capacitors B bi-directional, two switching tubes make the voltage of decoupling capacitors B have larger fluctuation to keep DC bus-bar voltage to stablize, to realize the power decoupled between inverter input and output simultaneously.The capacity of decoupling capacitors B is comparatively large, and stored the excess energy of photovoltaic array by it, the capacity of filtering capacitor is very little, and its effect keeps stablizing of DC bus-bar voltage.
The invention has the beneficial effects as follows: compared with prior art, substantive distinguishing features of the present invention is:
(1) according to the size of inverter output power, the power decoupling circuit that the present invention is used for photovoltaic combining inverter has following two kinds of mode of operations, 1. when the input power from photovoltaic array is greater than power output, power decoupling circuit is operated in charge mode: when switching tube A is open-minded, decoupling capacitors A discharges, electric current flows to through inductance the intermediate node that decoupling capacitors A and decoupling capacitors B connects from the emitter node of switching tube A, thus the electric current of inductance increases, induction charging; When switching tube A turns off, inductance is by the anti-paralleled diode afterflow of decoupling capacitors B and switching tube B, and inductive current reduces, and in continuous current circuit, decoupling capacitors B charges.In this charge mode, the voltage of decoupling capacitors A reduces gradually, and the voltage of decoupling capacitors B increases gradually, and the excess energy from photovoltaic array is stored in decoupling capacitors B.2. when the input power from photovoltaic array is less than power output, power decoupling circuit is operated in discharge mode: when switching tube B is open-minded, decoupling capacitors B discharges, electric current flows to the collector node of switching tube B from the intermediate node that decoupling capacitors A and decoupling capacitors B connects, thus inductive current increases, induction charging; When switching tube B turns off, inductance is by the anti-paralleled diode afterflow of decoupling capacitors A and switching tube A, and inductive current reduces, and in continuous current circuit, decoupling capacitors A charge, by decoupling capacitors A again the fault offset of storage in main circuit.In this discharge mode, the portion of energy stored discharges by decoupling capacitors B gradually, with the energy of supplementary photovoltaic array deficiency, the voltage of decoupling capacitors A increases gradually, the voltage of decoupling capacitors B reduces gradually, the energy part that decoupling capacitors B discharges is transferred in decoupling capacitors A, and another part supplements the not enough energy that photovoltaic array goes out.This energy refers in discharge mode, and the energy that inverter exports deducts the energy that photovoltaic array sends.
(2) the present invention is used for the power decoupling circuit of photovoltaic combining inverter in the application of photovoltaic combining inverter, the maximum voltage of decoupling capacitors A and decoupling capacitors B is all lower than DC bus-bar voltage, and the reduction of rated capacitor voltage significantly can reduce the cost of the volume of capacitor.
Compared with prior art, marked improvement of the present invention is:
(1) the present invention is used for the power decoupling circuit of photovoltaic combining inverter, while realizing power decoupled, can effectively reduce the capacity of required decoupling capacitance.By theory calculate and derivation, under the same conditions, when only using large electrochemical capacitor to realize power decoupled photovoltaic combining inverter, the capacitance of the electrochemical capacitor needed is 500 μ F, and when using the present invention to be used for the power decoupling circuit of photovoltaic combining inverter, capacitance only need be adopted to be the electrochemical capacitor of 180 μ F for identical input-output power, and in the voltage born at the maximum need of capacitor, the former is maximum is withstand voltagely required to be DC bus-bar voltage 400V, and the latter is only 320V.Thus be used in the present invention, in the power decoupling circuit of photovoltaic combining inverter, reducing the volume of electric capacity, add the power density of photovoltaic inverting system under the same conditions simultaneously.
(2) the present invention is used for the power decoupling circuit of photovoltaic combining inverter, the voltage drop that decoupling capacitance can be made to bear is low to moderate and is less than DC bus-bar voltage, be conducive to the cost and the volume that reduce whole circuit arrangement, be specially adapted to little power single phase photovoltaic grid-connected inverting system.
(3) the present invention is used for the power decoupling circuit of photovoltaic combining inverter, can ensure that DC bus-bar voltage is stabilized in about 400V, thus reduces the voltage ripple of DC bus, and is conducive to the tracking realizing maximum power point.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is the structural representation of the present invention for the power decoupling circuit of photovoltaic combining inverter.
Fig. 2 is the schematic diagram of the application of the present invention in photovoltaic combining inverter.
Fig. 3 is the waveform correlation schematic diagram of the present invention for the power decoupling circuit of photovoltaic combining inverter.
Fig. 4 is the course of work principle schematic that the present invention is applied to photovoltaic combining inverter.
Fig. 5 be the application test result of the embodiment of the present invention test the main waveform obtained.
In figure, 1. decoupling capacitors A, 2. decoupling capacitors B, 3. filtering capacitor, 4. switching tube A, 5. switching tube B, 6. inductance, 7. intermediate node, the 8. tie point of switching tube A emitter and switching tube B collector electrode, 9. cathode node, 10. negative pole node, 11. photovoltaic arrays, 12. inverters, 13. electrical networks, 14. DC buss
Embodiment
Embodiment illustrated in fig. 1ly to show, for the power decoupling circuit of photovoltaic combining inverter, be made up of a filtering capacitor 3, inductance 6, decoupling capacitors A1, decoupling capacitors B2, switching tube A4 and a switching tube B5, wherein, decoupling capacitors A1 and decoupling capacitors B2 is in parallel with filtering capacitor 3 after connecting, the collector electrode of the switching tube A4 after switching tube A4 and switching tube B5 connect be connected to decoupling capacitors A1 and decoupling capacitors B2 connect after and filtering capacitor 3 parallel connection part cathode node 9 on, this cathode node 9 is on a DC bus 14, the emitter of the switching tube B5 after switching tube A4 and switching tube B5 connect be connected in decoupling capacitors A1 and decoupling capacitors B2 connect after and filtering capacitor 3 parallel connection part negative pole node 10 on, this negative pole node is then on another DC bus 14, the intermediate node 7 that decoupling capacitors A1 and decoupling capacitors B2 connects is connected on the tie point 8 of switching tube A emitter and switching tube B collector electrode by inductance.
Embodiment illustrated in fig. 2ly to show, the applicable cases of the present invention in photovoltaic combining inverter is: in this figure in dotted line frame shown in the present invention's power decoupling circuit (as shown in Figure 1 the explanation of embodiment) of being used for photovoltaic combining inverter be connected to a DC bus 14 again near the positive and negative end of filtering capacitor 3 is in parallel with the positive and negative end of photovoltaic array 11, this power decoupling circuit after switching tube A4 and switching tube B5 connect positive and negative end be connected with the positive and negative end of inverter 12 input respectively, inverter 12 output is connected with electrical network 13.Decoupling capacitors A1 and decoupling capacitors B2 couples together by the bidirectional Buck-Boost converter be made up of switching tube A4, switching tube B5 and inductance 6, make energy can between decoupling capacitors A1 and decoupling capacitors B2 bi-directional, switching tube A4 and switching tube B5 makes the voltage of decoupling capacitors B2 have larger fluctuation to keep DC bus 14 voltage stabilization simultaneously, to realize the power decoupled between inverter 12 input and output.The capacity of decoupling capacitors B2 is comparatively large, and stored the excess energy of photovoltaic array 11 by it, the capacity of filtering capacitor 3 is very little, and its effect keeps stablizing of DC bus 14 voltage.
Embodiment illustrated in fig. 3ly to show, at output voltage P oamong the one-period of fluctuation, t 2-t 3in time period, P pv>P o, capacitor C 2charging, C 2voltage by U c2 (min)be elevated to U c2 (max), illustrate corresponding to the course of work of Fig. 4 a and Fig. 4 b illustrated embodiment.T 3-t 4in time period, P pv<P o, capacitor C 2electric discharge, C 2voltage by U c2 (max)be reduced to U c2 (min), illustrate corresponding to the course of work of Fig. 4 c and Fig. 4 d illustrated embodiment.
Embodiment illustrated in fig. 4ly to show, the course of work principle that the present invention is applied to photovoltaic combining inverter is: Fig. 4 a shows, the present invention shown in dotted line frame is used for the part of the power decoupling circuit (as shown in Figure 1 the explanation of embodiment) of photovoltaic combining inverter, switching tube A4 is open-minded, decoupling capacitors A1 discharges, electric current flows to the intermediate node 7 of decoupling capacitors A1 and decoupling capacitors B2 series connection from the emitter node 8 of switching tube A4, thus inductance 6 electric current increases, and inductance 6 charges; Fig. 4 b shows, the present invention shown in dotted line frame is used for the part of the power decoupling circuit (as shown in Figure 1 the explanation of embodiment) of photovoltaic combining inverter, switching tube A4 turns off, inductance 6 is by the anti-paralleled diode afterflow of decoupling capacitors B2 and switching tube B5, inductance 6 electric current reduces, and in continuous current circuit, decoupling capacitors B2 charges; Fig. 4 c shows, the present invention shown in dotted line frame is used for the part of the power decoupling circuit (as shown in Figure 1 the explanation of embodiment) of photovoltaic combining inverter, switching tube B5 is open-minded, decoupling capacitors B2 discharges, electric current flows to the collector node 8 of switching tube B5 from the intermediate node 7 that decoupling capacitors A1 and decoupling capacitors B2 connects, thus inductance 6 electric current increases, inductance 6 charges; Fig. 4 d shows, the present invention shown in dotted line frame is used for the part of the power decoupling circuit (as shown in Figure 1 the explanation of embodiment) of photovoltaic combining inverter, switching tube B5 turns off, inductance 6 is by the anti-paralleled diode afterflow of decoupling capacitors A1 and switching tube A4, inductance 6 electric current reduces, and in continuous current circuit, decoupling capacitors A1 charges.
Embodiment
As shown in the embodiment of fig. 1, its connection and methods for using them in photovoltaic combining inverter is as shown in Fig. 2 embodiment for the composition of the power decoupling circuit for photovoltaic combining inverter of the present embodiment.The voltage of DC bus 14 is kept to be 400V(± 2% in application), photovoltaic combining inverter output voltage 220V/50Hz, power output is 1kW, this switching frequency being used for the power decoupling circuit of photovoltaic combining inverter is 40kHz, decoupling capacitors A1 be 22 μ F and withstand voltage be 172V, decoupling capacitors B2 be 136 μ F and withstand voltage be 320V, filter capacitor 3 be 22 μ F and withstand voltage be 400V.Switching tube A4 and switching tube B5 all adopts insulated gate bipolar transistor IKP15N65H5, and inductance 6 is 2mH, and electrical network 13 frequency is 50Hz.
Fig. 5 give the application test result of the embodiment of the present invention test the main waveform obtained.As shown in this figure, the output current of photovoltaic combining inverter is sinusoidal waveform, the minimum voltage u of decoupling capacitors B2 c2 (min)with maximum voltage u c2 (max)be respectively 219V and 315V, its magnitude of a voltage fluctuation is 86V, average voltage U m=272V.And the minimum and maximum value of the voltage of DC bus 14 is respectively 408V and 392V, ripple factor is 4%.This experimental result and theory analysis basically identical.
In above-described embodiment, involved photovoltaic array, switching tube, capacitor, inductance, photovoltaic combining inverter and electrical network are all known, all components and parts can obtain by the known approach such as being purchased, and the method for attachment of all components and parts is also all the common line connecting method known by those skilled in the art.

Claims (1)

1. for the power decoupling circuit of photovoltaic combining inverter, it is characterized in that: be made up of a filtering capacitor, inductance, decoupling capacitors A, decoupling capacitors B, switching tube A and a switching tube B, wherein, decoupling capacitors A and decoupling capacitors B is in parallel with filtering capacitor after connecting, the collector electrode of the switching tube A after switching tube A and switching tube B connect be connected to decoupling capacitors A and decoupling capacitors B connect after and filtering capacitor parallel connection part cathode node on, this cathode node is on a DC bus, the emitter of the switching tube B after switching tube A and switching tube B connect be connected in decoupling capacitors A and decoupling capacitors B connect after and filtering capacitor parallel connection part negative pole node on, this negative pole node is then on another DC bus, the intermediate node that decoupling capacitors A and decoupling capacitors B connects is connected to by inductance on the tie point of switching tube A emitter and switching tube B collector electrode, the capacitance of above-mentioned filtering capacitor be 22 μ F and withstand voltage be 400V, the inductance value of inductance is 2mH, the capacitance of decoupling capacitors A be 22 μ F and withstand voltage be 172V, the capacitance of decoupling capacitors B be 136 μ F and withstand voltage be 320V, switching tube A and switching tube B all adopts insulated gate bipolar transistor IKP15N65H5.
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CN112910296A (en) * 2021-01-07 2021-06-04 元山(济南)电子科技有限公司 Single-phase inverter

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