CN203554317U - A photovoltaic inverter power supply system - Google Patents

A photovoltaic inverter power supply system Download PDF

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Publication number
CN203554317U
CN203554317U CN201320637139.8U CN201320637139U CN203554317U CN 203554317 U CN203554317 U CN 203554317U CN 201320637139 U CN201320637139 U CN 201320637139U CN 203554317 U CN203554317 U CN 203554317U
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China
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output
photovoltaic
power
power supply
direct current
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CN201320637139.8U
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朱军卫
徐剑峰
张俊
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SHANGHAI CHINT POWER SYSTEMS CO Ltd
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SHANGHAI CHINT POWER SYSTEMS CO 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

The utility model relates to a photovoltaic inverter power supply system. The photovoltaic inverter power supply system is characterized in secondary windings of a power frequency isolation transformer form at least three paths of outputs; the first path of output provides electric power for system elements of a photovoltaic inverter; the second path of output is connected with an input end of a first alternating current-direct current conversion unit; a direct current bus voltage forms at an output end of the first alternating current-direct current conversion unit; the third path of output goes through a current-limiting resistor R1 to be connected with an input end of a second alternating current-direct current conversion unit; an output end of the second alternating current-direct current conversion unit is connected to a contactor coil; an input end of a DC/CD high frequency switch power supply is connected with a direct current input end of the photovoltaic inverter, and an output end of the DC/CD high frequency switch power supply is in parallel connection with the direct current bus voltage; one path of the direct current bus voltage goes through a rectifier diode D2 and a switch device to be connected with the contactor coil; and the other path of the direct current bus voltage provides electric power for a control system of the photovoltaic inverter. According to the utility model, the stability of the voltage of a system bus is ensured, and a power supply demand of low voltage ride-through is satisfied. Furthermore, a requirement of a usage life of 10 to 20 years of the whole photovoltaic inverter is ensured.

Description

A kind of photovoltaic DC-to-AC converter electric power system
Technical field
The utility model relates to a kind of photovoltaic DC-to-AC converter electric power system, can effectively solve the variety of issue of photovoltaic DC-to-AC converter system power supply, meets the power reguirements during low voltage crossing, belongs to photovoltaic DC-to-AC converter electric power system.
Background technology
Along with developing of photovoltaic industry, market proposes to be strict with to photovoltaic DC-to-AC converter: normal need of work possesses high reliability, long-life requirement, inverter need possess low voltage ride-through function, when electrical network generation low voltage crossing fault, photovoltaic DC-to-AC converter not only can not off-grid, also will provide reactive power support to electrical network, helps electrical network to recover as early as possible.Illustration 1, in 0 moment, electrical network generation low-voltage crossing fault, line voltage falls, and 0~T1 moment photovoltaic DC-to-AC converter must keep being incorporated into the power networks, and T1~T2 moment recovers gradually when line voltage, and photovoltaic DC-to-AC converter just can cut out from electrical network.
There are the following problems when electrical network low voltage passes through for photovoltaic inverter control system power supply plan at present:
1,, during electrical network generation low voltage crossing, line voltage falls, and by grid side power taking dead electricity in drop-out time section, cannot meet inverter control system power reguirements.
2, the control coil of main contactor (hereinafter to be referred as contactor line bag) is inductive load, in the time of adhesive need power larger, but maintain adhesive need power less, so adopt AC supply power mode more.During system generation low voltage crossing, line voltage falls, contactor line bag dead electricity, and contactor disconnects off-grid.
3,, in order to meet low voltage crossing requirement, most producer adopts the scheme that adds UPS, the charged pool of UPS own, and cost is high, belongs to industrial goods, cannot meet photovoltaic DC-to-AC converter 10 years, and the even life requirements of 20 years needs periodic replacement.Ye You producer adopts large electrochemical capacitor to support, meet the requirement of low voltage crossing, for example name is called < < photovoltaic DC-to-AC converter low voltage crossing circuit > >, the patent No. is that 201120477261.4 utility model patent adopts large electrochemical capacitor to support, meet the requirement of low voltage crossing, the same average life problem of electrochemical capacitor, needs periodic replacement.
4, contactor line bag is inductive load, and in adhesive, power is larger, with photovoltaic inverter control system power supply common bus, can cause busbar voltage big ups and downs, sometimes has a strong impact on control system reliably working.
Summary of the invention
The technical problems to be solved in the utility model is to improve the reliability of photovoltaic inverter control system, and makes it meet low voltage crossing requirement, meanwhile, does not affect useful life.
In order to solve the problems of the technologies described above, the technical solution of the utility model has been to provide a kind of photovoltaic DC-to-AC converter electric power system, comprise power frequency isolating transformer, the first AC-DC converting unit, the second AC-DC converting unit, DC/DC high frequency switch power, it is characterized in that: the former limit winding of power frequency isolating transformer connects electrical network, the secondary winding of power frequency isolating transformer forms at least three tunnel outputs, one tunnel is output as the system element power supply of photovoltaic DC-to-AC converter, the second tunnel output connects the input of the first AC-DC converting unit, the output of the first AC-DC converting unit forms DC bus-bar voltage, Third Road output connects the input of the second AC-DC converting unit, the output of the second AC-DC converting unit is connected to contactor line bag, the input of DC/DC high frequency switch power is connected to the direct-flow input end of photovoltaic DC-to-AC converter, its output is parallel to DC bus-bar voltage, DC bus-bar voltage is divided into two-way, one tunnel is connected to contactor line bag through rectifier diode D2 and switching device, the control system power supply that an other road is photovoltaic DC-to-AC converter.
Preferably, described the first AC-DC converting unit is AC/DC high frequency switch power or bridge rectification power.
Preferably, described the second AC-DC converting unit is rectification module.
Preferably, on the output of described rectification module, be parallel with filter capacitor C1.
Preferably, described switching device is electronic switch or relay or contactor.
Preferably, the output of the Third Road of the secondary winding of described power frequency isolating transformer connects the input of the second AC-DC converting unit through current-limiting resistance R1 or fuse.
The utlity model has following advantage:
1, adopt AC/DC high frequency switch power and DC/DC high frequency switch power simultaneously to photovoltaic DC-to-AC converter system power supply, guaranteed the stability of system busbar voltage, realized system power supply 1+1 backup, improved the reliability of system.
2, during low voltage crossing, DC/DC high frequency switch power is whole photovoltaic DC-to-AC converter power supply, met the power demands of low voltage crossing, the unique design of AC/DC and DC/DC high frequency switch power, has guaranteed the long-life requirement in 10~20 years of whole photovoltaic DC-to-AC converter.
3, by effective circuit and work schedule control, in contactor attracting process, realized the effective isolation of contactor power supply with control system power supply, greatly reduce the interference of contactor work to control system power supply.
Accompanying drawing explanation
Fig. 1 is the grid-connected point voltage of photo-voltaic power generation station and time plot;
The circuit theory diagrams of a kind of photovoltaic DC-to-AC converter electric power system that Fig. 2 provides for the utility model.
Embodiment
For the utility model is become apparent, hereby with preferred embodiment, and coordinate accompanying drawing to be described in detail below.
As shown in Figure 2, a kind of photovoltaic DC-to-AC converter electric power system that the utility model provides comprises power frequency isolating transformer T1, AC/DC high frequency switch power, DC/DC high frequency switch power, current-limiting resistance R1, rectifier module D B1, rectifier diode D2, switching device S1, filter capacitor C1.
The input winding N1 of power frequency isolating transformer T1 connects electrical network, output is divided into that three windings are respectively the first output winding N2, the second output winding N3 and the 3rd output winding N4 (does not limit and is output as three windings, it can be same winding, also can be two windings of any function combination), wherein the system element of the output voltage U 2 of the first output winding N2 other photovoltaic DC-to-AC converter such as be AC blower fan is powered.The second output winding N3 connects the input of AC/DC high frequency switch power, and the output-parallel of AC/DC high frequency switch power, to DC bus-bar voltage U1, is the control system power supply of photovoltaic DC-to-AC converter.The 3rd output winding N4 produces output voltage U 3 after current-limiting resistance R1 and rectifier module D B1, connects contactor line bag, in normal mode of operation, to contactor power supply, provides larger instantaneous adhesive power.The input of DC/DC high frequency switch power is connected to the direct-flow input end of photovoltaic DC-to-AC converter, its output voltage is parallel to DC bus-bar voltage U1, DC bus-bar voltage U1 is divided into two-way, one tunnel is connected to contactor line bag through rectifier diode D2 and switching device S1, and an other road is to the control system power supply of photovoltaic DC-to-AC converter.Switching device S1 can be IGBT, and the various forms of electronic switches such as MOSFET can be also relays, contactor.The position of isolating diode D2 and switching device S1, can be as required at positive direct-current bus, or negative DC bus.
It is 1.6KVA that power frequency isolating transformer T1 arranges capacity, is not limited to three output windings, also can multiple windings, meet the demand of other power supplies.AC/DC high frequency switch power adopts single switch flyback topology, DC/DC high frequency switch power adopts double-transistor flyback topology, filter capacitor C1 is 1uF~10uF, be preferably 2.2uF, diode D2 is STTH212U, current-limiting resistance R1 is NTC SCK30-S, rectifier module D B1 is rectifier bridge GBPC2502, switching device S1 is switching tube, also can be relay, wherein the effect of switching device S1 is that time delay 2S supplies with DC/DC high frequency switch power output voltage again after contactor adhesive signal feeding, the impact to DC bus-bar voltage U1 while avoiding contactor adhesive.
The method of work of a kind of photovoltaic DC-to-AC converter electric power system that the utility model provides when electrical network generation low voltage crossing fault is:
Before main contactor adhesive each time, the state of switching device S1 in disconnecting, control system sends out contactor order closed, now, adhesive power required in main contactor attracting process is provided by the output voltage U 3 of rectifier module D B1, after contactor is stablized adhesive, and switching device S1 closure, DC bus-bar voltage U1 is after output isolating diode D2 and switching device S1, in parallel with output voltage U 3.In the utility model, DC bus-bar voltage U1 is less than output voltage U 3 certain values, and output voltage U 3 can fluctuate along with the fluctuation of line voltage, and while normally working, output voltage U 3 provides contactor to keep power.DC bus-bar voltage U1 is the output voltage of AC/DC high frequency switch power and DC/DC high frequency switch power, highly stable, due to the existence of output isolating diode D2, can not be subject to the impact that output voltage U 3 fluctuates.When electrical network generation low voltage crossing fault, electrical breakdown, power frequency isolating transformer T1 input power supply is lost, corresponding AC/DC high frequency switch power output dead electricity, output voltage U 3 dead electricity of rectifier module D B1, the DC bus-bar voltage U1 keeping system of now being exported by DC/DC high frequency switch power is powered, and the maintenance power of main contactor adhesive, the power reguirements while meeting low voltage crossing are provided.
This photovoltaic DC-to-AC converter electric power system, simple in structure, with low cost.Finally should be noted that; above embodiment is only in order to illustrate the technical solution of the utility model; but not restriction to the utility model protection range; although grin the utility model be explained in detail with reference to better enforcement; those of ordinary skill in the art is to be understood that; can modify or be equal to replacement the technical solution of the utility model, and not depart from essence and the scope of technical solutions of the utility model.

Claims (6)

1. a photovoltaic DC-to-AC converter electric power system, comprise power frequency isolating transformer (T1), the first AC-DC converting unit, the second AC-DC converting unit, DC/DC high frequency switch power, it is characterized in that: the former limit winding of power frequency isolating transformer (T1) connects electrical network, the secondary winding of power frequency isolating transformer (T1) forms at least three tunnel outputs, one tunnel is output as the system element power supply of photovoltaic DC-to-AC converter, the second tunnel output connects the input of the first AC-DC converting unit, the output of the first AC-DC converting unit forms DC bus-bar voltage (U1), Third Road output connects the input of the second AC-DC converting unit, the output of the second AC-DC converting unit is connected to contactor line bag, the input of DC/DC high frequency switch power is connected to the direct-flow input end of photovoltaic DC-to-AC converter, its output is parallel to DC bus-bar voltage (U1), DC bus-bar voltage (U1) is divided into two-way, one tunnel is connected to contactor line bag through rectifier diode D2 and switching device (S1), the control system power supply that an other road is photovoltaic DC-to-AC converter.
2. a kind of photovoltaic DC-to-AC converter electric power system as claimed in claim 1, is characterized in that: described the first AC-DC converting unit is AC/DC high frequency switch power or bridge rectification power.
3. a kind of photovoltaic DC-to-AC converter electric power system as claimed in claim 1, is characterized in that: described the second AC-DC converting unit is rectification module (DB1).
4. a kind of photovoltaic DC-to-AC converter electric power system as claimed in claim 3, is characterized in that: on the output of described rectification module (DB1), be parallel with filter capacitor C1.
5. a kind of photovoltaic DC-to-AC converter electric power system as claimed in claim 1, is characterized in that: described switching device (S1) is electronic switch or relay or contactor.
6. a kind of photovoltaic DC-to-AC converter electric power system as claimed in claim 1, is characterized in that: the Third Road output of the secondary winding of described power frequency isolating transformer (T1) connects the input of the second AC-DC converting unit through current-limiting resistance R1 or fuse.
CN201320637139.8U 2013-10-15 2013-10-15 A photovoltaic inverter power supply system Active CN203554317U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103683978A (en) * 2013-10-15 2014-03-26 上海正泰电源系统有限公司 Power supply system and method of photovoltaic inverter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103683978A (en) * 2013-10-15 2014-03-26 上海正泰电源系统有限公司 Power supply system and method of photovoltaic inverter

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