CN204928612U - Photovoltaic power generation device with auxiliary resonant circuit - Google Patents

Photovoltaic power generation device with auxiliary resonant circuit Download PDF

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Publication number
CN204928612U
CN204928612U CN201520535208.3U CN201520535208U CN204928612U CN 204928612 U CN204928612 U CN 204928612U CN 201520535208 U CN201520535208 U CN 201520535208U CN 204928612 U CN204928612 U CN 204928612U
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China
Prior art keywords
boost
switching device
diode
collector electrode
emitter
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Expired - Fee Related
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CN201520535208.3U
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Chinese (zh)
Inventor
张庆海
李洪博
刘安华
王和先
刘英倩
蔡军
张涛
张斌
孔鹏
鲍景宽
黄国强
顾卫山
郭亚峰
张蕊
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Liaocheng Power Supply Co of State Grid Shandong Electric Power Co Ltd
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Liaocheng Power Supply Co of State Grid Shandong Electric Power Co Ltd
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    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

Abstract

The utility model discloses a photovoltaic power generation device with auxiliary resonant circuit, including photovoltaic array, boost boost circuit, auxiliary resonant circuit, PWM contravariant bridge, three phase resistance inductive loads. Boost boost circuit realizes that photovoltaic array output maximum power trails, through auxiliary resonant circuit's resonance, switching, voltage and electric current zero lap during the power device switch are accomplished to PWM contravariant bridge switching element under the no -voltage condition. The utility model discloses direct current side voltage can periodically drop to zero, makes the switching element of PWM contravariant bridge realize zero voltage switch, is favorable to reducing photovoltaic power generation's switching loss, improvement switching frequency, is showing the efficiency that has improved photovoltaic power generation.

Description

A kind of photovoltaic power generation apparatus with auxiliary resonance circuit
Technical field
The utility model relates to a kind of photovoltaic power generation apparatus with auxiliary resonance circuit, belongs to generation of electricity by new energy and intelligent grid field.
Background technology
In recent years, along with the aggravation of energy crisis and environmental pollution, the regenerative resources such as the solar energy as an alternative energy are used widely.Solar energy is converted into electric energy via Blast Furnace Top Gas Recovery Turbine Unit (TRT), then carries out transformation of electrical energy by power electronic equipment and make it to meet relevant criterion; Electric energy after conversion directly can be supplied to load, also can be incorporated to mains network.Inverter has been exactly the most frequently used power electronic equipment needed for energy conversion.
For increasing the conversion efficiency of inverter, improve the important technical that switching frequency becomes inverter design.But the hard switching effect of power electronic device governs the high frequency of inverter.Hard switching effect makes power electronic device there will be the pulse spike of high rate of change at the voltage of switching moments or electric current, very large waveform overlay region is also there is simultaneously, this increases making inverter switching device loss, produces serious electromagnetic interference, and along with the raising of switching frequency, above defect can be more serious.Introduce the defect that soft switch technique effectively can solve hard switching inverter.
Summary of the invention
The technical problems to be solved in the utility model is: for the deficiencies in the prior art, provide a kind of photovoltaic power generation apparatus with auxiliary resonance circuit, DC voltage periodically can drop to zero, the switching device of PWM inverter bridge is made to realize zero voltage switch, and auxiliary switch also can realize Sofe Switch action, be conducive to the switching loss, the raising switching frequency that reduce photovoltaic generation.
The technical solution of the utility model is: a kind of photovoltaic power generation apparatus with auxiliary resonance circuit, comprises photovoltaic array, Boost circuit, auxiliary resonance circuit, PWM inverter bridge, three-phase resistance inductive load; Photovoltaic array, Boost circuit, auxiliary resonance circuit, PWM inverter bridge, three-phase resistance inductive load connects successively, and the direct current energy that photovoltaic array exports is for conversion into AC energy, is three-phase resistance sense load supplying; Boost circuit comprises photovoltaic side storage capacitor C 0, Boost boost inductance L 0, Boost circuit switching device S 0, Boost circuit diode VD 0, DC side storage capacitor C 1; Auxiliary resonance circuit comprises auxiliary switch device S a1and anti-paralleled diode VD a1, auxiliary switch device S a2and anti-paralleled diode VD a2, booster diode VD a3and VD a4, resonant capacitance C r2, resonant inductance L r; Photovoltaic array and photovoltaic side storage capacitor C 0be connected in parallel, photovoltaic array output cathode and Boost boost inductance L 0be connected, Boost boost inductance L 0the other end and Boost circuit switching device S 0collector electrode, Boost circuit diode VD 0anode be connected, Boost circuit diode VD 0negative electrode and DC side storage capacitor C 1one end, auxiliary switch device S a1collector electrode, anti-paralleled diode VD a1negative electrode be connected, DC side storage capacitor C 1the other end and Boost circuit switching device S 0emitter, booster diode VD a4anode, resonant inductance L rone end, photovoltaic array output negative pole be connected; Auxiliary switch device S a1emitter and anti-paralleled diode VD a1anode, booster diode VD a3negative electrode, auxiliary switch device S a2collector electrode, anti-paralleled diode VD a2negative electrode be connected, booster diode VD a3anode and booster diode VD a4negative electrode, resonant capacitance C r2one end be connected, resonant capacitance C r2the other end and auxiliary switch device S a2emitter, anti-paralleled diode VD a2anode, resonant inductance L rthe other end be connected; PWM inverter bridge adopts three-phase full-bridge inverter structure, by six switching device S 1~ S 6and their respective anti-paralleled diodes and parallel connection buffer electric capacity composition; Switching device S 1, S 3, S 5collector electrode be connected, as the input anode of PWM inverter bridge, and with auxiliary switch device S in auxiliary resonance circuit a2collector electrode be connected; Switching device S 2, S 4, S 6emitter be connected, as the input negative terminal of PWM inverter bridge, and with booster diode VD in auxiliary resonance circuit a4anode be connected; Switching device S 1emitter and switching device S 2collector electrode be connected, switching device S 3emitter and switching device S 4collector electrode be connected, switching device S 5emitter and switching device S 6collector electrode be connected, by switching device S 2, S 4, S 6collector electrode draw a, b, c tri-outputs of PWM inverter bridge respectively; A, b, c tri-outputs of PWM inverter bridge are connected with a phase of three-phase resistance inductive load, b phase, c respectively.
The beneficial effects of the utility model: 1, DC voltage periodically can drop to zero, make the switching device of PWM inverter bridge realize zero voltage switch; 2, by the resonance of auxiliary resonance circuit, PWM converter bridge switching parts device completes switching under zero voltage condition, voltage and current zero lap during power device switch, is conducive to the switching loss, the raising switching frequency that reduce photovoltaic generation, significantly improves the efficiency of photovoltaic generation.
Accompanying drawing explanation
Fig. 1 is the utility model structural representation.
Fig. 2 is the utility model equivalent circuit diagram; i lrfor flowing through L relectric current, u cr1, u cr2be respectively electric capacity C r1, C r2the voltage at two ends.
Embodiment
Below in conjunction with Figure of description, the technical solution of the utility model is further elaborated, but is not limited thereto.
Figure 1 shows that a kind of photovoltaic power generation apparatus structural representation with auxiliary resonance circuit, comprise photovoltaic array, Boost circuit, auxiliary resonance circuit, PWM inverter bridge, three-phase resistance inductive load.Photovoltaic array, Boost circuit, auxiliary resonance circuit, PWM inverter bridge, three-phase resistance inductive load connects successively, and the direct current energy that photovoltaic array exports is for conversion into AC energy, is three-phase resistance sense load supplying; Boost circuit comprises photovoltaic side storage capacitor C 0, Boost boost inductance L 0, Boost circuit switching device S 0, Boost circuit diode VD 0, DC side storage capacitor C 1; Auxiliary resonance circuit comprises auxiliary switch device S a1and anti-paralleled diode VD a1, auxiliary switch device S a2and anti-paralleled diode VD a2, booster diode VD a3and VD a4, resonant capacitance C r2, resonant inductance L r; Photovoltaic array and photovoltaic side storage capacitor C 0be connected in parallel, photovoltaic array output cathode and Boost boost inductance L 0be connected, Boost boost inductance L 0the other end and Boost circuit switching device S 0collector electrode, Boost circuit diode VD 0anode be connected, Boost circuit diode VD 0negative electrode and DC side storage capacitor C 1one end, auxiliary switch device S a1collector electrode, anti-paralleled diode VD a1negative electrode be connected, DC side storage capacitor C 1the other end and Boost circuit switching device S 0emitter, booster diode VD a4anode, resonant inductance L rone end, photovoltaic array output negative pole be connected; Auxiliary switch device S a1emitter and anti-paralleled diode VD a1anode, booster diode VD a3negative electrode, auxiliary switch device S a2collector electrode, anti-paralleled diode VD a2negative electrode be connected, booster diode VD a3anode and booster diode VD a4negative electrode, resonant capacitance C r2one end be connected, resonant capacitance C r2the other end and auxiliary switch device S a2emitter, anti-paralleled diode VD a2anode, resonant inductance L rthe other end be connected; PWM inverter bridge adopts three-phase full-bridge inverter structure, by six switching device S 1~ S 6and their respective anti-paralleled diodes and parallel connection buffer electric capacity composition; Switching device S 1, S 3, S 5collector electrode be connected, as the input anode of PWM inverter bridge, and with auxiliary switch device S in auxiliary resonance circuit a2collector electrode be connected; Switching device S 2, S 4, S 6emitter be connected, as the input negative terminal of PWM inverter bridge, and with booster diode VD in auxiliary resonance circuit a4anode be connected; Switching device S 1emitter and switching device S 2collector electrode be connected, switching device S 3emitter and switching device S 4collector electrode be connected, switching device S 5emitter and switching device S 6collector electrode be connected, by switching device S 2, S 4, S 6collector electrode draw a, b, c tri-outputs of PWM inverter bridge respectively; A, b, c tri-outputs of PWM inverter bridge are connected with a phase of three-phase resistance inductive load, b phase, c respectively.
Boost circuit realizes photovoltaic array Maximum Power Output and follows the tracks of.By the resonance of auxiliary resonance circuit, PWM converter bridge switching parts device completes switching under zero voltage condition, and voltage and current zero lap during power device switch, makes switching loss reduce.
To simplify the analysis, following hypothesis is done: 1, device is ideal operation state; 2, photovoltaic array, Boost circuit are equivalent to a direct voltage source E; 3, load inductance is much larger than resonant inductance, and the load current of PWM converter bridge switching parts status transition moment can think constant-current source I 0; 4,6 main switching devices of PWM inverter bridge are equivalent to S inv, the antiparallel fly-wheel diode of main switching device is equivalent to VD inv; 5,6 buffer capacitors of inverter bridge are equivalent to C r1, get C r1=3C s, C sfor the size of each buffer capacitor; This is because when the switching device of the upper and lower any one party of each brachium pontis of inverter bridge is connected, all make the electric capacity C in parallel with it sshort circuit, electric capacity during normal work on 3 brachium pontis is equivalent to 3 Capacitance parallel connections.
On above-mentioned 5 hypothesis bases, can obtain equivalent circuit diagram of the present utility model shown in Fig. 2, the current/voltage of each several part is just all with the direction shown in Fig. 2.
The utility model can be divided into 8 mode of operations in a switch periods.With reference to equivalent electric circuit shown in Fig. 2, successively each mode of operation is introduced below.
Mode of operation 1(t ~ t 0): initial condition, direct voltage source is by auxiliary switch device S alto Load transportation electric energy, system is in stable state.
Mode of operation 2 (t 0~ t 1): at t 0moment, auxiliary switch device S a2be opened, at resonant inductance L reffect under, make to flow through auxiliary switch device S a2electric current climbing reduce, therefore S a2achieve zero current turning-on.S a2after being opened, L rboth end voltage value is E, L rcharged, i lrlinear increase, at t 1in the moment, work as i lrlinearly increase to I btime, mode of operation 2 terminates.
Mode of operation 3 (t 1~ t 2): at t 1moment, S albe turned off, at C rleffect under, S althe climbing of shutdown moment terminal voltage is lowered, therefore S alachieve zero voltage turn-off.S alafter shutoff, L rand C rlenter resonance condition, C rlelectric discharge, L rcharged.U cr1reduce gradually, i lrincrease gradually.At t 2in the moment, work as u cr1be reduced to zero, i lrincrease to maximum I ptime, mode of operation 3 terminates.In this pattern, C r1except to L rbeyond the branch road electric discharge of place, also simultaneously to load discharge, constant to maintain load current.
Mode of operation 4 (t 2~ t 3): at t 2moment, S a2be turned off, open equivalent switch S simultaneously inv(being equivalent to bridgc arm short), at C r1effect under, S a2the climbing of shutdown moment terminal voltage is lowered, therefore S a2achieve zero voltage turn-off.Because t 2in the moment, u cr1be reduced to zero, so S invachieve no-voltage open-minded.S a2after shutoff, L rand C r2start resonance, L relectric discharge, C r2charged, i lrreduce gradually, u cr2increase gradually.At t 3in the moment, work as i lrbe reduced to zero, u cr2increase to U ptime, mode of operation 4 terminates.
Mode of operation 5 (t 3~ t 4): at t 3moment, L rand C r2continue resonance, i lrstart oppositely to increase, i lrflow through VD a3and S inv.L rcharged, C r2electric discharge.I lroppositely increase gradually, u cr2reduce gradually.At t 4in the moment, work as u cr2be reduced to zero, i lrinverse change is to maximum I ptime, mode of operation 5 terminates.
Mode of operation 6 (t 4~ t 5): at t 4in the moment, turn off equivalent switch S inv(be equivalent to brachium pontis and return to normal condition by short circuit), at C r1effect under, S invthe climbing of shutdown moment terminal voltage is lowered, therefore S invachieve zero voltage turn-off.S invafter shutoff, L rand C r1enter resonance condition, C r1charged, L relectric discharge.U cr1increase gradually, i lrreduce gradually.L ralso simultaneously to load discharge, constant to maintain load current.At t 5in the moment, work as u cr1when increasing to E, mode of operation 6 terminates.
Mode of operation 7 (t 5~ t 6): at t 5moment, S alanti-paralleled diode VD alstart conducting, now open auxiliary switch device S al, S alachieve no-voltage open-minded.VD alafter conducting, L rbearing magnitude of voltage is E, flows through L rcurrent i lrlinear reduction.At t 6in the moment, work as i lrlinearly be reduced to I 0time, no current flows through VD al, mode of operation 7 terminates.
Mode of operation 8 (t 6~ t 7): at t 6moment, S a1start conducting, i lrcontinue linear reduction.At t 7in the moment, work as i lrwhen being linearly reduced to zero, mode of operation 8 terminates.Then circuit returns mode of operation 1, starts the work of next switch periods.More than analyze on the basis that load current direction is positive, the circuit operating pattern when load current direction becomes negative and above-mentioned mode of operation similar, no longer describe in detail here.

Claims (1)

1. with a photovoltaic power generation apparatus for auxiliary resonance circuit, it is characterized in that, comprise photovoltaic array, Boost circuit, auxiliary resonance circuit, PWM inverter bridge, three-phase resistance inductive load; Photovoltaic array, Boost circuit, auxiliary resonance circuit, PWM inverter bridge, three-phase resistance inductive load connects successively, and the direct current energy that photovoltaic array exports is for conversion into AC energy, is three-phase resistance sense load supplying; Boost circuit comprises photovoltaic side storage capacitor C 0, Boost boost inductance L 0, Boost circuit switching device S 0, Boost circuit diode VD 0, DC side storage capacitor C 1; Auxiliary resonance circuit comprises auxiliary switch device S a1and anti-paralleled diode VD a1, auxiliary switch device S a2and anti-paralleled diode VD a2, booster diode VD a3and VD a4, resonant capacitance C r2, resonant inductance L r; Photovoltaic array and photovoltaic side storage capacitor C 0be connected in parallel, photovoltaic array output cathode and Boost boost inductance L 0be connected, Boost boost inductance L 0the other end and Boost circuit switching device S 0collector electrode, Boost circuit diode VD 0anode be connected, Boost circuit diode VD 0negative electrode and DC side storage capacitor C 1one end, auxiliary switch device S a1collector electrode, anti-paralleled diode VD a1negative electrode be connected, DC side storage capacitor C 1the other end and Boost circuit switching device S 0emitter, booster diode VD a4anode, resonant inductance L rone end, photovoltaic array output negative pole be connected; Auxiliary switch device S a1emitter and anti-paralleled diode VD a1anode, booster diode VD a3negative electrode, auxiliary switch device S a2collector electrode, anti-paralleled diode VD a2negative electrode be connected, booster diode VD a3anode and booster diode VD a4negative electrode, resonant capacitance C r2one end be connected, resonant capacitance C r2the other end and auxiliary switch device S a2emitter, anti-paralleled diode VD a2anode, resonant inductance L rthe other end be connected; PWM inverter bridge adopts three-phase full-bridge inverter structure, by six switching device S 1~ S 6and their respective anti-paralleled diodes and parallel connection buffer electric capacity composition; Switching device S 1, S 3, S 5collector electrode be connected, as the input anode of PWM inverter bridge, and with auxiliary switch device S in auxiliary resonance circuit a2collector electrode be connected; Switching device S 2, S 4, S 6emitter be connected, as the input negative terminal of PWM inverter bridge, and with booster diode VD in auxiliary resonance circuit a4anode be connected; Switching device S 1emitter and switching device S 2collector electrode be connected, switching device S 3emitter and switching device S 4collector electrode be connected, switching device S 5emitter and switching device S 6collector electrode be connected, by switching device S 2, S 4, S 6collector electrode draw a, b, c tri-outputs of PWM inverter bridge respectively; A, b, c tri-outputs of PWM inverter bridge are connected with a phase of three-phase resistance inductive load, b phase, c respectively.
CN201520535208.3U 2015-07-22 2015-07-22 Photovoltaic power generation device with auxiliary resonant circuit Expired - Fee Related CN204928612U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107332456A (en) * 2017-08-01 2017-11-07 东北大学 A kind of three-phase passive flexible switch inverter circuit
CN112994190A (en) * 2021-04-28 2021-06-18 西安特锐德智能充电科技有限公司 Control method and control device of photovoltaic charging module

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107332456A (en) * 2017-08-01 2017-11-07 东北大学 A kind of three-phase passive flexible switch inverter circuit
CN107332456B (en) * 2017-08-01 2019-04-05 东北大学 A kind of three-phase passive flexible switch inverter circuit
CN112994190A (en) * 2021-04-28 2021-06-18 西安特锐德智能充电科技有限公司 Control method and control device of photovoltaic charging module
CN112994190B (en) * 2021-04-28 2024-04-12 西安特来电智能充电科技有限公司 Control method and control device of photovoltaic charging module

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Granted publication date: 20151230

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