CN206878475U - A kind of single-phase grid-connected photovoltaic power generation system - Google Patents

A kind of single-phase grid-connected photovoltaic power generation system Download PDF

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Publication number
CN206878475U
CN206878475U CN201621082355.0U CN201621082355U CN206878475U CN 206878475 U CN206878475 U CN 206878475U CN 201621082355 U CN201621082355 U CN 201621082355U CN 206878475 U CN206878475 U CN 206878475U
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diode
switching device
electric capacity
anode
negative electrode
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王东东
王岩
邓振文
吕江波
代锡伟
尹晓丽
李兰磊
代涛
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Shandong Haide Photovoltaic Amperex Technology Ltd
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Shandong Haide Photovoltaic Amperex Technology Ltd
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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

A kind of single-phase grid-connected photovoltaic power generation system of the present utility model, ensure that from structure and does not produce common mode current, DC component is not produced to AC network, improve the efficiency of photovoltaic generation.

Description

A kind of single-phase grid-connected photovoltaic power generation system
Technical field
A kind of single-phase grid-connected photovoltaic power generation system is the utility model is related to, belongs to distributed power generation and intelligent grid field.
Background technology
Inverter is the critical component for connecting photovoltaic array module and power network, to realize that photovoltaic array module is run on most High-power point and to power network inject sinusoidal current.There are three kinds of basic inverters at present:Industrial Frequency Transformer type photovoltaic DC-to-AC converter, height Frequency power transformer type photovoltaic DC-to-AC converter and Transformer-free photovoltaic DC-to-AC converter.Two types than before, Transformer-free photovoltaic inversion Not only cost reduces device, and volume and weight is smaller, and its efficiency can improve 1%~2%.
However, due to no transformer isolation, electrical connection between photovoltaic array module and power network be present, except causing to pacify Outside full problem, it is also possible to produce following two problems:1st, the electric current that inverter is input in power network may contain larger direct current Component (direct current injection), causes the distribution transformer Point Drifting in power network, may cause transformer saturation;If the 2nd, inversion Utensil has variable common-mode voltage, and common mode current, i.e. leakage current can be produced between photovoltaic array module and ground.Common mode current can Serious conduction type or radial pattern electromagnetic interference can be caused, cause power network current to produce distortion, and add the extra damage of system Consumption.
The content of the invention
A kind of single-phase grid-connected photovoltaic power generation system of the present utility model, it ensure that from structure and do not produce common mode electricity Stream, does not produce DC component to AC network, improves the efficiency of photovoltaic generation.
The technical solution of the utility model is:A kind of single-phase grid-connected photovoltaic power generation system, photovoltaic array and the energy storage of photovoltaic side Electric capacity C0It is connected in parallel, photovoltaic array output cathode and Boost boost inductances L0It is connected, Boost boost inductances L0The other end with Boost boost circuit switch devices S0Colelctor electrode, Boost circuit diode VD0Anode be connected, Boost boosting electricity Road diode VD0Negative electrode and DC side storage capacitor CdOne end, electric capacity C1One end, switching device S3Colelctor electrode, it is anti-simultaneously Di- pole pipe VD3Negative electrode, electric capacity C3One end be connected, electric capacity C1The other end and electric capacity C2One end, diode VD6The moon Pole, switching device S1Colelctor electrode, anti-paralleled diode VD1Negative electrode be connected, diode VD6Anode and switching device S2's Emitter stage, anti-paralleled diode VD2Anode be connected, switching device S1Emitter stage and anti-paralleled diode VD1Anode, two Pole pipe VD5Anode be connected, switching device S2Colelctor electrode and anti-paralleled diode VD2Negative electrode, diode VD5Negative electrode, Switching device S3Emitter stage, anti-paralleled diode VD3Anode, switching device S4Colelctor electrode, anti-paralleled diode VD4's Negative electrode, ac filter inductance L1One end be connected, ac filter inductance L1Another one end for being connected to AC network, electric capacity C3 The other end and electric capacity C4One end, the other end of AC network be connected, electric capacity C4The other end and switching device S4Transmitting Pole, anti-paralleled diode VD4Anode, electric capacity C2The other end, DC side storage capacitor CdThe other end, Boost circuit Switching device S0Emitter stage, photovoltaic array output negative pole is connected.
Brief description of the drawings
Fig. 1 is the utility model structure diagram.
Fig. 2 is the utility model structure equivalent circuit diagram.
Fig. 3 is the drive signal time diagram of the utility model single-phase inversion circuit;In figure, ugFor AC network electricity Pressure, S1、 S2、S3、S4Respectively switching device S1~S4Drive signal sequential.
Embodiment
The technical solution of the utility model is further elaborated with reference to Figure of description, but not limited to this.
Fig. 1 show the utility model structure diagram, photovoltaic array and photovoltaic side storage capacitor C0It is connected in parallel, photovoltaic Array output cathode and Boost boost inductances L0It is connected, Boost boost inductances L0The other end and Boost circuit switching device S0Colelctor electrode, Boost circuit diode VD0Anode be connected, Boost circuit diode VD0Negative electrode and direct current Side storage capacitor CdOne end, electric capacity C1One end, switching device S3Colelctor electrode, anti-paralleled diode VD3Negative electrode, electric capacity C3 One end be connected, electric capacity C1The other end and electric capacity C2One end, diode VD6Negative electrode, switching device S1Colelctor electrode, anti- Parallel diode VD1Negative electrode be connected, diode VD6Anode and switching device S2Emitter stage, anti-paralleled diode VD2's Anode is connected, switching device S1Emitter stage and anti-paralleled diode VD1Anode, diode VD5Anode be connected, derailing switch Part S2Colelctor electrode and anti-paralleled diode VD2Negative electrode, diode VD5Negative electrode, switching device S3Emitter stage, inverse parallel Diode VD3Anode, switching device S4Colelctor electrode, anti-paralleled diode VD4Negative electrode, ac filter inductance L1One end It is connected, ac filter inductance L1Another one end for being connected to AC network, electric capacity C3The other end and electric capacity C4One end, hand over The other end of stream power network is connected, electric capacity C4The other end and switching device S4Emitter stage, anti-paralleled diode VD4Anode, electricity Hold C2The other end, DC side storage capacitor CdThe other end, Boost circuit switching device S0Emitter stage, photovoltaic array Output negative pole is connected.
Equivalent circuit diagram of the present utility model is as shown in Figure 2.In Fig. 2, vinFor an equivalent direct voltage source, iC1~iC4Point Capacitor C Wei not flowed through1~C4Electric current, igFor grid-connected current, ugFor ac grid voltage;In addition, had also shown in Fig. 2 1st, 2,3 three nodes and direct voltage source vinPositive pole P and negative pole N.V is used below1NIndicate the electricity between node 1 and node N Pressure, the rest may be inferred by analogy for it.
Fig. 3 show drive signal time diagram of the present utility model.
For the utility model, it is in the positive half period of ac grid voltage, switching device S2、S4It is held off, switchs Device S1It is open-minded always, switching device S3High frequency is carried out by sinusoidal rule to open and turn off:1st, switching device S3During conducting, v1N= vin, v2N=vin/ 2, differential mode voltage vdm=v12=vin/ 2, common-mode voltage vcm=3vin/ 4, therefore common-mode voltage total in circuit vtcm=vin/2;2nd, switching device S3Shut-off, switching device S1During conducting, vin=v2N=vin/ 2, differential mode voltage vdm=v12=0, Common-mode voltage vcm=vin/ 2, total common-mode voltage v in circuittcm=vin/2。
In the negative half-cycle of line voltage, switching device S1、S3It is held off, switching device S2It is open-minded always, switching device S4High frequency is carried out by sinusoidal rule to open and turn off:1st, switching device S4During conducting, vlN=0, v2N=vin/ 2, differential mode voltage vdm =v12=-vin/ 2, common-mode voltage vcm=vin/ 4, therefore common-mode voltage v total in circuittcm=vin/2;2nd, switching device S4Close Disconnected, switching device S2During conducting, v1N=v2N=vin/ 2, differential mode voltage vdm=v12=0, common-mode voltage vcm=vin/ 2, in circuit Total common-mode voltage vtcm=vin/2。
Analyzed more than, the total common-mode voltage of the utility model is a constant, and its common mode current is zero.
In a grid-connected current igCycle T in, to grid-connected current igThe DC component of grid-connected current can be obtained by carrying out integration igdcFor:
In formula (I), as electric capacity C1And C2When equal, iCl=iC2;As electric capacity C3And C4When equal, iC3=iC4.If at one The voltage change control of grid cycle interior nodes 2 and 3 is zero, then from formula (I), the utility model is to the straight of grid-connected current Flow component is zero.

Claims (1)

1. a kind of single-phase grid-connected photovoltaic power generation system, it is characterised in that photovoltaic array and photovoltaic side storage capacitor C0It is connected in parallel, Photovoltaic array output cathode and Boost boost inductances L0It is connected, Boost boost inductances L0The other end switchs with Boost circuit Device S0Colelctor electrode, Boost circuit diode VD0Anode be connected, Boost circuit diode VD0Negative electrode with DC side storage capacitor CdOne end, electric capacity C1One end, switching device S3Colelctor electrode, anti-paralleled diode VD3Negative electrode, Electric capacity C3One end be connected, electric capacity C1The other end and electric capacity C2One end, diode VD6Negative electrode, switching device S1Current collection Pole, anti-paralleled diode VD1Negative electrode be connected, diode VD6Anode and switching device S2Emitter stage, anti-paralleled diode VD2Anode be connected, switching device S1Emitter stage and anti-paralleled diode VD1Anode, diode VD5Anode be connected, open Close device S2Colelctor electrode and anti-paralleled diode VD2Negative electrode, diode VD5Negative electrode, switching device S3Emitter stage, anti- Parallel diode VD3Anode, switching device S4Colelctor electrode, anti-paralleled diode VD4Negative electrode, ac filter inductance L1's One end is connected, ac filter inductance L1Another one end for being connected to AC network, electric capacity C3The other end and electric capacity C4One End, the other end of AC network are connected, electric capacity C4The other end and switching device S4Emitter stage, anti-paralleled diode VD4Sun Pole, electric capacity C2The other end, DC side storage capacitor CdThe other end, Boost circuit switching device S0Emitter stage, light Photovoltaic array output negative pole is connected.
CN201621082355.0U 2016-09-27 2016-09-27 A kind of single-phase grid-connected photovoltaic power generation system Active CN206878475U (en)

Priority Applications (1)

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CN201621082355.0U CN206878475U (en) 2016-09-27 2016-09-27 A kind of single-phase grid-connected photovoltaic power generation system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201621082355.0U CN206878475U (en) 2016-09-27 2016-09-27 A kind of single-phase grid-connected photovoltaic power generation system

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CN206878475U true CN206878475U (en) 2018-01-12

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