A kind of photovoltaic generating system
This utility model is related to technical field of photovoltaic power generation, and in particular to a kind of photovoltaic generating system.
As the supply of traditional energy has occurred short situation, the utilization to regenerative resource also begins to put on agenda.
Increasingly paid close attention to by everybody as the solar energy of one of pollution-free clean energy resource.Photovoltaic generation is exactly a kind of using renewable
The energy produces the power-saving technology of electric energy, and luminous energy is directly translated into electricity using the photovoltaic effect of interface by the technology
Can, for equipment using or be connected to the grid, being capable of energy saving to a great extent.Photovoltaic generating system is largely divided into two at present
Class, independent operating photovoltaic generating system and grid-connected photovoltaic power generation system.For independent operating photovoltaic generating system, electric energy it is unique
Source is photovoltaic array, is to ensure stability and operational efficiency, and system not only must be equipped with accumulator battery to store and adjust electricity
Can, even and if in the case where accumulator battery is equipped with, appoint, the electric energy of battery storage without
Method meets need for electricity and causes the problem having a power failure.For grid-connected photovoltaic power generation system, photovoltaic generating system is connected with electrical network, energy
Amount is connected to the grid, and reaches the purpose of energy-conservation, but grid-connected high to power requirements, needs to meet frequency, voltage, phase sequence and phase place etc.
Concordance, control circuit is complicated, easily breaks down, and equipment cost is of a relatively high, simultaneously as technology and policy reasons,
Some areas feed back to the electric energy of electrical network and are not measured, and feed back to the electric energy in regional power grid, it is impossible to true with electric unit
Value economically is being brought just.
Utility model content
This utility model provides a kind of photovoltaic generating system, solves current independent operating photovoltaic system when illumination is inadequate
Time cannot provide electric energy needed for load and the problem that causes power failure, and grid-connected photovoltaic power generation system when being connected to the grid because to which
Self performance is required too high and causes less economical problem.
This utility model is achieved through the following technical solutions：
A kind of photovoltaic generating system, including photovoltaic array, DC chopped-wave unit, anti-reverse charging unit, photovoltaic controller, electric power storage
Pond group, inversion unit and permutator, wherein,
The photovoltaic array outfan connects DC chopped-wave unit input, for converting solar energy into electrical energy output extremely
DC chopped-wave unit；
The DC chopped-wave unit outfan connects anti-reverse charging unit input, for the unidirectional current for exporting photovoltaic array
Pressure is converted to stable rated DC current and presses to inversion unit powers；
The anti-reverse charging unit outfan connects inversion unit input, for preventing accumulator battery from filling to photovoltaic array
The photovoltaic controller is electrically connected with DC chopped-wave unit, accumulator battery and inversion unit, for according to direct current
The input of copped wave unit, output voltage, accumulator battery voltage and inversion unit input voltage generate corresponding DC chopped-wave unit control
Signal processed and inversion unit control signal so that DC chopped-wave unit exports stable rated DC current, inversion unit output is steady
Fixed specified alternating current；
The accumulator battery connects anti-reverse charging unit outfan, for storing the electric energy of DC chopped-wave unit output, and root
Power to inversion unit according to needs；
The inversion unit outfan connects permutator main power source input, for by DC chopped-wave unit and accumulator
The DC voltage of group output is converted to alternating voltage；
The external civil power of stand-by power supply input of the permutator, outfan external load, for detecting that main power source is defeated
Enter end and stand-by power supply input terminal voltage numerical value, and switch supply line accordingly.
Especially, the photovoltaic generating system also includes electric capacity of voltage regulation, and the electric capacity of voltage regulation is parallel to inversion unit input
Between anode and input negative terminal, for being filtered to inversion unit input voltage, voltage stabilizing process.
Especially, the DC chopped-wave unit adopts decompression DC chopper.
Especially, the anti-reverse charging unit includes the first anti-reverse charging diode and the second anti-reverse charging diode, described first
The anode connection DC chopped-wave unit output plus terminal of anti-reverse charging diode, the negative electrode connection inversion unit of the first anti-reverse charging diode
Input positive terminal；The anode connection inversion unit input negative terminal of second anti-reverse charging diode, the moon of the second anti-reverse charging diode
Pole connection DC chopped-wave unit output negative terminal.
Especially, the inversion unit adopts three phase bridge all control inversion module.
Especially, the permutator is adopted and is hauled oneself willingly into from replica automatic change-over.
This utility model compared with prior art, has the following advantages and advantages：
A kind of photovoltaic generating system described in the utility model, the system pass through permutator, using photovoltaic generation as main electricity
Source, using electrical network as stand-by power supply, switches over automatically as load supplying, so as to both ensure confession of the photovoltaic generating system to loading
Electricity does not receive illumination effect, reduces failure, improves power supplying efficiency, at the same the system by the electric energy from photovoltaic array and electrical network every
From avoiding having high demands and caused problem with high costs, less economical photovoltaic generating system because grid-connected, so as to ensure light again
Photovoltaic generating system has the advantages that economical and practical.
Description of the drawings
Accompanying drawing described herein is used for providing further understanding this utility model embodiment, constitutes the one of the application
Part, does not constitute the restriction to this utility model embodiment.In the accompanying drawings：
Fig. 1 is transformer station's automatic change-over device of emergency theory diagram that this utility model embodiment 1 is provided.
To make the purpose of this utility model, technical scheme and advantage become more apparent, with reference to embodiment and accompanying drawing,
The utility model is described in further detail, and exemplary embodiment of the present utility model and its explanation are only used for explaining this
Utility model, is not intended as to restriction of the present utility model.
As shown in figure 1, Fig. 1 is transformer station's automatic change-over device of emergency principle that this utility model embodiment 1 is provided
In the present embodiment, photovoltaic generating system includes photovoltaic array 1, DC chopped-wave unit 2, anti-reverse charging unit 3, photovoltaic control
Device processed 4, accumulator battery 5, electric capacity of voltage regulation 6, inversion unit 7 and permutator 8.
Individually photovoltaic cell due to output voltage it is low, electric current is little, power is little and be unable to large-scale use, it is actually used in
Use photovoltaic array, photovoltaic array is exporting with relatively high power of being formed after rational connection in series-parallel of some photovoltaic cells more
Energy conversion device, the present embodiment converted solar energy into electrical energy using photovoltaic array, and the outfan connection of photovoltaic array 1 is straight
The input of stream copped wave unit 2, the electric energy of conversion is exported to DC chopped-wave unit 2,2 Jing anti-reverse charging units of DC chopped-wave unit
3 it is in parallel with accumulator battery 5 after access inversion unit 7 input, parallel voltage-stabilizing between the input positive terminal and negative terminal of inversion unit 7
Electric capacity 6, the outfan of the main power source end connection inversion unit 7 of permutator 8, the external civil power of standby electricity source of permutator 8,
The outfan external load 9 of permutator 8, photovoltaic controller 4 are equal with DC chopped-wave unit 2, accumulator battery 5 and inversion unit 7
Connection.Specifically, the DC chopped-wave unit 2 adopts decompression DC chopper, the anti-reverse charging unit 3 to include the first counnter attack
Fill diode D1 and the second anti-reverse charging diode D2, the anode connection DC chopped-wave unit 2 of first anti-reverse charging diode D1
Output plus terminal, the negative electrode of the first anti-reverse charging diode D1 connects the input positive terminal of inversion unit 7, two pole of the second anti-reverse charging
The anode of pipe D2 connects the input negative terminal of inversion unit 7, the negative electrode connection DC chopped-wave unit 2 of the second anti-reverse charging diode D2
Output negative terminal；The inversion unit 7 adopts three phase bridge all control inversion module；The permutator 8 is adopted to be hauled oneself willingly into from replica certainly
The operation principle of the photovoltaic generating system is：On daytime, when illumination is sufficient, photovoltaic array output is non-stable straight
Stream electricity, carries out DC-DC conversion through decompression DC chopper, is converted into stable rated DC current, buck DC chopped-wave
The device output input that access three phase bridge all control inversion module in parallel with accumulator battery, will by three phase bridge all control inversion module
Into three-phase alternating current, the main power source end from replica automatic change-over is hauled oneself willingly in access to DC inverter, to external load supplying.Separately
Outward, the input of photovoltaic controller collection decompression DC chopper, output voltage signal, the output electricity of decompression DC chopper
Press and be：, input voltages of the wherein E for decompression DC chopper, U0For lifting
Pressure dc chopper output voltage, T be a switch periods, tonFor in a switch periods controlled member conducting time,
toffFor in a switch periods controlled member shut-off time, α is dutycycle, when photovoltaic controller collects buck direct current
The input voltage signal of chopper, according to the value of output rated voltage, calculates dutycycle, exports corresponding Duty ratio control letter
Number, so as to by the output voltage control of decompression DC chopper in rated voltage.Meanwhile, photovoltaic controller collection three-phase bridge
The input and output voltage signal of full control inversion module, the output fundamental voltage of inverter circuit are multiplied by duty equal to DC voltage
Than when photovoltaic controller collects the input direct voltage signal of three phase bridge all control inversion module, according to the specified friendship of output
The value of stream voltage, calculates dutycycle, exports corresponding duty cycle control signal, so as to by three phase bridge all control inversion module
Output voltage control is in rated voltage.In addition, photovoltaic controller can also show decompression DC chopper input, output electricity in real time
Pressure, the voltage of the input, output voltage and accumulator battery of three phase bridge all control inversion module are easy to monitoring system operation feelings
Condition.At night, photovoltaic array no longer produces electric energy, and system is powered by accumulator battery, now the potential of accumulator battery positive pole
Higher than the potential of decompression DC chopper output cathode, but due to the unidirectional general character of diode D1, D2, electric current can not lead to
The positive pole for crossing accumulator flows into the positive pole of decompression DC chopper, therefore can effectively prevent accumulator battery from filling to photovoltaic array
Electricity, so as to avoid the damage of photovoltaic array.The unidirectional current of accumulator battery output carries out inverse through three phase bridge all control inversion module
Become, be converted into three-phase alternating current, the main power source end from replica automatic change-over is hauled oneself willingly in access, is that external load is powered.With
The consumption of electric energy, accumulator battery output voltage will be reduced, and cause the output voltage of three phase bridge all control inversion module to reduce, it is impossible to
Meet present load power demands, monitor that three phase bridge all control inversion module is under-voltage when hauling oneself willingly into from replica automatic change-over
When, standby electricity source is switched to, the external civil power of its standby electricity source is load supplying by civil power, so as to ensure that load not
Interruptedly supplying power.Second day daytime, photovoltaic array produce electric energy again, are that accumulator battery is charged, automatic from replica when hauling oneself willingly into
When permutator monitors that main power source end input voltage returns to rated voltage, main power source end, i.e. three-phase bridge are will again handoff to
Formula controls inversion module entirely, is load supplying again by photovoltaic.
The technical solution of the utility model, by permutator, using photovoltaic generation as main power source, using electrical network as standby
Power supply, is switched over automatically as load supplying, so as to both ensure photovoltaic generating system to the power supply for loading by illumination effect, subtract
Few failure, improves power supplying efficiency, while the electric energy from photovoltaic array is isolated with electrical network by the system, is avoided because grid-connected again to light
Photovoltaic generating system has high demands and caused problem with high costs, less economical, so as to ensure that photovoltaic generating system has economy
Above-described specific embodiment, is entered to the purpose of this utility model, technical scheme and beneficial effect
One step is described in detail, be should be understood that to the foregoing is only specific embodiment of the present utility model, is not used to limit
Fixed protection domain of the present utility model, all any modifications within spirit of the present utility model and principle, made, equivalent are replaced
Change, improve, should be included within protection domain of the present utility model.