CN203218892U - Photovoltaic auxiliary grid-connected power generation controller and power generation system using same - Google Patents

Photovoltaic auxiliary grid-connected power generation controller and power generation system using same Download PDF

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CN203218892U
CN203218892U CN2013202008530U CN201320200853U CN203218892U CN 203218892 U CN203218892 U CN 203218892U CN 2013202008530 U CN2013202008530 U CN 2013202008530U CN 201320200853 U CN201320200853 U CN 201320200853U CN 203218892 U CN203218892 U CN 203218892U
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electric wire
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胥明军
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胥明军
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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 provides a photovoltaic auxiliary grid-connected power generation controller and a photovoltaic auxiliary grid-connected power generation system using the controller. The controller comprises the following parts: a direct current voltage-boosting module, a direct current power-limiting and voltage-varying module, a direct current compensating module, an alternating current inversion module, an alternating current switching module, a monitoring module and a control module. The power generation system comprises the following parts: the controller, a photovoltaic assembly, a grid-connected inverter, a public power grid, and a user load. thrThrough use of controller and the power generation system which are described in the utility model, photovoltaic power generation is high in energy utilization efficiency, stable system operation is achieved, priority is given to the photovoltaic assembly power generation mode while the public power grid serves as an alternative, surplus electric quantity output by the photovoltaic assembly is output to the public power grid in a grid-connected manner and then is stored, the influence scope of islanding effects can be restricted, the utilization rate of photovoltaic power generation is improved, the load pressure of the public power grid is reduced, and effects exerted on the public power grid is reduced when electricity generated by the photovoltaic assembly is output to the public power grid.

Description

A kind of for the auxiliary controller that generates electricity by way of merging two or more grid systems of photovoltaic and the electricity generation system of using it
Technical field
The utility model belongs to the parallel network power generation field, is specifically related to a kind of for the auxiliary control device that generates electricity by way of merging two or more grid systems of photovoltaic and the electricity generation system that adopts this control device.
Background technology
Solar photovoltaic generation system can be divided into centralized large-scale grid-connected photovoltaic power generation system and dispersed miniature grid-connected photovoltaic power generation system two major types.The former main feature be generate electricity and can be delivered directly on the electrical network, powered to the user by the electrical network unified allocation of resources.And the latter, particularly with the dwelling house roof photovoltaic generating system of building combination, then be with the photovoltaic module electricity can directly be assigned to residential customer with on the electric loading, unnecessary or not enough electric power is regulated by connecting electrical network.This system also can be divided into adverse current and two kinds of forms of no adverse current.Wherein, contracurrent system being arranged, is when photovoltaic system produces dump power this electric energy to be sent into electrical network; When photovoltaic system electric power is not enough, then by the electrical network supplementary power.This system generally is not design for the generating capacity of photovoltaic system is not complementary with the load electricity consumption time greater than load or generating dutation.Residential system is because the electric weight of output is subjected to the restriction in weather and season, and the free differentiation of electricity consumption for guaranteeing power balance, generally all has been designed to contracurrent system.There is contracurrent system to adopt the method for parallel network reverse to realize and to have sent the electricity also can be to grid transmission to user load.But can not solve following problem like this: when at electrical network for some reason under the dead electricity situation, combining inverter can quit work because of protection " island effect ", causes energy waste.No contracurrent system be to power to user load jointly with photovoltaic system generating and electrical network, and when power supply, the photovoltaic system generating can not flow to electrical network, has only when photovoltaic system electric power is not enough, then by the electrical network supplementary power.Photovoltaic system does not have the power wastage that contracurrent system can cause when producing dump power, in order to prevent this waste, the photovoltaic generating system that has has increased charging device and storage battery, is used for the unnecessary electric energy of storage, and is used for the compensation power supply to user load when the photovoltaic module generating capacity is not enough.But the use of charging device and storage battery has increased the construction of system greatly and has safeguarded input.
For this reason, need the auxiliary grid-connected system of a kind of photovoltaic, it can be powered to user load jointly with photovoltaic generation and public electric wire net, and when power supply, the dump power that photovoltaic generation produces can flow to public electric wire net, and " storage " is in public electric wire net.And when photovoltaic generation can not satisfy the power consumption of load, public electric wire net was supplied as a supplement, and can realize following purpose: do not comprise energy storage devices such as storage battery in (1) photovoltaic generating system; (2) the dump energy input public electric wire net of photovoltaic generation generation has been avoided waste; (3) when public electric wire net for some reason under the dead electricity situation, the electric energy that photovoltaic generation produces still can use to user load, has avoided waste; (4) photovoltaic generation is as preferred power supply, and public electric wire net is power supply as a supplement, guarantees efficient, the preferential use of photovoltaic generation.
Summary of the invention
It is a kind of for the auxiliary controller that generates electricity by way of merging two or more grid systems of photovoltaic that one of the purpose of this utility model is to provide, and adopts the grid-connected photovoltaic system of this controller to solve the problems of the technologies described above, and can realize above-mentioned purpose.
Technical scheme described in the utility model is as follows:
A kind of for the auxiliary controller that generates electricity by way of merging two or more grid systems of photovoltaic, comprise with lower member:
The DC boosting module is connected with photovoltaic module, is used for the direct current that photovoltaic module produces is boosted, and its output is connected with DC compensation module, direct current limit power transformation module respectively; Described DC boosting module is made of the first voltage feedback sense circuit, a DC-DC converter and first pwm control circuit.
Direct current limit power transformation module is connected with control module with the DC boosting module, and its output is connected with combining inverter, be used for according to control signal the electric energy more than needed of photovoltaic module output being exported to combining inverter, and then the input public electric wire net; Described direct current limit power transformation module is made of the 2nd DC-DC converter, second pwm control circuit, the second voltage feedback sense circuit and tertiary voltage feedback sense circuit.Wherein, control module detects the offset current of public electric wire net output and the output voltage of DC compensation module by monitoring modular, if the DC voltage that public electric wire net is not exported the output of offset current and DC compensation module is the DC voltage after by rectification higher than the public electric wire net civil power, show that the photovoltaic module generating has more than needed, control module was controlled direct current limit power voltage changing module and was increased power output this moment, and the electric energy more than needed that photovoltaic module is sent out is incorporated into the power networks and exports public electric wire net to; Then continue the offset current of monitoring public electric wire net output and the output voltage of DC compensation module, if the DC voltage that the output of public electric wire net offset current or DC compensation module arranged is the DC voltage after by rectification lower than the public electric wire net civil power, show that photovoltaic module flows to the electric weight of user load inadequate, control direct current limit power voltage changing module this moment and reduce power output, reducing is incorporated into the power networks exports the electric weight of public electric wire net to, until close direct current limit power voltage changing module, stop the photovoltaic module electricity can be incorporated into the power networks and export public electric wire net to
The DC compensation module, be connected with the DC boosting module with public electric wire net, being used for making public electric wire net get civil power at the energy output of photovoltaic module during less than the power consumption of user load can compensate the direct current of DC boosting module output, and the direct current after will compensating exports to described ac converter module, and its output is connected with monitoring modular with the ac converter module respectively.Described DC compensation module is made of rectification circuit and DC offset circuit.Concerning user load, when the energy output deficiency of photovoltaic module, carry out DC compensation earlier by public electric wire net, the direct current after will compensating again is reverse into civil power.Wherein, rectification circuit becomes in parallel in dc terminal with the direct current of photovoltaic output behind the direct current with the commercial power rectification, carries out DC compensation.Adopt the DC compensation mode, be conducive to improve the reliability of circuit, and cost is low.
The ac converter module, its output is connected with user load, and the direct current inversion that is used for the output of DC compensation module is to export to user load behind the civil power; Described ac converter module is made of DC-AC converter, the 3rd pwm control circuit and the 4th voltage feedback sense circuit.Described DC-AC converter comprises sinewave inverter and line filter, and wherein said sinewave inverter adopts single-phase sinewave inverter or three-phase sine-wave inverter.
Exchange handover module, be used for the control according to control module, the input current of user load is switched between public electric wire net and ac converter module; Described interchange handover module constitutes by exchanging commutation circuit.
Monitoring modular, be used for gathering the voltage signal of the current and voltage signals of public electric wire net output, the current and voltage signals of photovoltaic module output, the current and voltage signals that exchanges handover module output and the output of DC compensation module, and above-mentioned signal is sent to control module; Described monitoring modular is made of the first current/voltage testing circuit, the second current/voltage testing circuit, the 3rd current/voltage testing circuit and voltage detecting circuit.
And control module, be connected with monitoring modular, be used for receiving the current and voltage signals of monitoring modular input and sending control signal according to above-mentioned signal and control DC boosting module, direct current limit power transformation module, ac converter module respectively and exchange handover module work.Described control module is made of single-chip microcomputer and peripheral circuit thereof.
Second goal of the invention of the present utility model is to provide a kind of photovoltaic to assist grid-connected system, comprises above-mentioned controller, photovoltaic module, public electric wire net, combining inverter and user load.Wherein, the described combining inverter of described combining inverter comprises single-phase grid-connected inverter or three-phase grid-connected inverter, is used for limitting the direct current of power transformation module output to be reverse into civil power input public electric wire net direct current, and its output is connected with public electric wire net.The energy output of described photovoltaic module is at least greater than 10% of the power consumption of user load.
Adopt controller described in the utility model or photovoltaic generating system, the efficiency of energy utilization height, system is stable; When the photovoltaic module generating is sufficient, preferentially to give the user with the electric energy of photovoltaic module output and use, unnecessary electric energy is exported to public electric wire net; At 10% o'clock of the not enough user load of photovoltaic module generating output electric energy, photovoltaic module is exported electric energy export to public electric wire net, use the energy waste that causes to avoid public electric wire net too much to replenish and directly public electric wire net is supplied with the user; Not enough and more than 10% o'clock of user load at photovoltaic module output electric energy, to public electric wire net output electric energy, replenish and give the user and use and get the insufficient section electric energy from public electric wire net; When photovoltaic module is not exported, then directly public electric wire net is supplied with the user and used; For some reason during dead electricity, limited the coverage of " island effect " at public electric wire net, except combining inverter, the other parts operate as normal still can be powered to the user, has improved the utilance of photovoltaic generation.And isolated being connected of user and public electric wire net, reduced the load pressure of public electric wire net, only electric energy more than needed has been sent into public electric wire net, reduced when photovoltaic generation networks the influence to public electric wire net.
Description of drawings
Fig. 1 is the structured flowchart of the auxiliary grid-connected system of photovoltaic described in the utility model, wherein assists the structured flowchart of the controller that generates electricity by way of merging two or more grid systems in the black surround for photovoltaic described in the utility model;
Fig. 2 is the block diagram of the specific embodiment of the auxiliary grid-connected system of photovoltaic described in the utility model;
Fig. 3 is the auxiliary control flow chart that generates electricity by way of merging two or more grid systems of photovoltaic described in the utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in further detail.
As shown in Figure 1, the auxiliary grid-connected system of photovoltaic described in the utility model comprises controller 1 described in the utility model, photovoltaic module 2, public electric wire net 3, combining inverter 5 and user load 4.Wherein, the direct current that described controller 1 produces photovoltaic module 2 is processed into civil power to user load 4 power supplies, also can not generate electricity or the electric power that produces when being less than loss in the civil power compensation process (generally be no more than user load 10%) at photovoltaic module 2, control public electric wire net 3 is directly to user load 4 power supplies.When the electric power of photovoltaic module 2 generations has residue, by controller 1 dump power is got up by combining inverter 5 input public electric wire nets 3 " storage "; The power shortage that produces when photovoltaic module 2 but during more than the loss in the civil power compensation process (be generally above user load 10%), public electric wire net 3 is powered to user load jointly to controller 1 electric power that affords redress; The power shortage user load that produces when photovoltaic module 2 10% the time, by controller control photovoltaic module electricity power is directly flowed to public electric wire net 3 by combining inverter 5.
As shown in Figure 2, described controller 1 comprises DC boosting module, direct current limit power transformation module, DC compensation module, ac converter module, exchanges handover module, monitoring modular and control module.
Wherein, described photovoltaic module 1 is connected with the first current/voltage testing circuit with a described DC-DC converter respectively.
The DC boosting module is made of the first voltage feedback sense circuit, a DC-DC converter and first pwm control circuit.The output of the first voltage feedback sense circuit is connected with first pwm control circuit, and the output of first pwm control circuit is connected with a DC-DC converter.The output of the one DC-DC converter is connected with the 2nd DC-DC converter, DC offset circuit, the first voltage feedback sense circuit and the second voltage feedback sense circuit.
Direct current limit power transformation module is made of the 2nd DC-DC converter, second pwm control circuit, the second voltage feedback sense circuit and tertiary voltage feedback sense circuit.The output of the second voltage feedback sense circuit is connected with second pwm control circuit, and the output of second pwm control circuit is connected with the 2nd DC-DC converter.The output of the 2nd DC-DC converter is connected with combining inverter with the tertiary voltage feedback sense circuit.The output of tertiary voltage feedback sense circuit is connected with second pwm control circuit.Particularly, described direct current limit power transformation module electric energy more than needed of realization photovoltaic module output under control module, monitoring modular and combining inverter 5 cooperate is incorporated into the power networks and outputs to public electric wire net " storage ".Control module judges by monitoring modular whether public electric wire net has exported offset current I, if do not export offset current I, it is more than needed to illustrate that then solar energy has, and controls direct current limit power model this moment and increases power output, increases the electric energy of the output of being incorporated into the power networks; Continue the monitoring public electric wire net then and whether exported offset current I, if output offset current I is arranged, the electric weight that the output of being incorporated into the power networks then is described is excessive, control direct current limit power model this moment and reduce power output, reduce the electric energy of the output of being incorporated into the power networks, guarantee that thus the photovoltaic module generating has precedence over the use of public electric wire net generating.That is to say, when output offset current I is arranged, at first reduce the electric energy of the output of being incorporated into the power networks, preferentially to the user load power supply, if still have offset current I, then continue to reduce the power of the output of being incorporated into the power networks until closing direct current limit power transformation module.Stop the output of being incorporated into the power networks of electric energy with photovoltaic module output if close direct current limit power transformation module, still can not enough supply user load, then compensated by public electric wire net.
The DC compensation module is made of rectification circuit and DC offset circuit.The output of rectification circuit is connected with DC offset circuit.The output of DC offset circuit is connected with voltage detecting circuit with the DC-AC converter.Particularly, when the energy output of photovoltaic module is less than the power consumption of user load, the civil power that the direct voltage U1 of DC boosting module output can be lower than public electric wire net is imported the direct voltage U2 of DC offset circuit after the rectification circuit rectification, thereby make public electric wire net carry out supplementary power by DC offset circuit to the back direct current that boosts that photovoltaic module produces automatically, the direct voltage U3 that keeps the input AC inversion module is constant, guarantees the stable power-supplying of user load.And at the energy output of photovoltaic module during more than the power consumption of user load, the civil power that the direct voltage U1 of DC boosting module output can be kept above public electric wire net is always imported the direct voltage U2 of DC offset circuit after the rectification circuit rectification, thereby make public electric wire net be in Light Condition, can the user load supplementary power not kept by the independent stable power-supplying to user load of photovoltaic module.
The ac converter module is made of DC-AC converter, the 3rd pwm control circuit and the 4th voltage feedback sense circuit.The DC-AC converter comprises sinewave inverter and line filter, and wherein said sinewave inverter adopts single-phase sinewave inverter or three-phase sine-wave inverter.The output of DC-AC converter and the 4th voltage feedback sense circuit, exchange commutation circuit and the second current/voltage testing circuit is connected.The output of the 4th voltage feedback sense circuit is connected with the 3rd pwm control circuit.The output of the 3rd pwm control circuit is connected with the DC-AC converter.
Exchanging handover module constitutes by exchanging commutation circuit.The output that exchanges commutation circuit is connected with user load.
Monitoring modular is made of the first current/voltage testing circuit, the second current/voltage testing circuit, the 3rd current/voltage testing circuit and voltage detecting circuit.Wherein, the first current/voltage testing circuit is connected with the output of photovoltaic module 2, to detect the current and voltage signals of its output; The second current/voltage testing circuit is connected with the output that exchanges commutation circuit, to detect the current and voltage signals of its output; The 3rd current/voltage testing circuit is connected with the output of public electric wire net 3, with electric current and the voltage signal that detects its output; Voltage detecting circuit is connected with the output of a DC-DC converter, to detect the current and voltage signals of its output.The output of the above-mentioned first current/voltage testing circuit, the second current/voltage testing circuit, the 3rd current/voltage testing circuit and voltage detecting circuit links to each other with single-chip microcomputer, provides to single-chip microcomputer and detects the signal that obtains, so that single-chip microcomputer generates associated control signal.
Control module is made of single-chip microcomputer and peripheral circuit thereof.The output of single-chip microcomputer is respectively with first pwm control circuit, second pwm control circuit, the 3rd pwm control circuit with exchange commutation circuit and be connected, to control these parts.
Combining inverter 5 comprises single-phase grid-connected inverter or three-phase grid-connected inverter.The output of combining inverter 5 is connected with public electric wire net 3.
The output of public electric wire net 3 with exchange commutation circuit, rectification circuit and the 3rd current/voltage testing circuit and be connected.
After boosting, the DC-DC booster circuit that the output electric energy of photovoltaic module 2 constitutes through a DC-DC converter, first pwm control circuit and the first current/voltage testing circuit 1 outputs to DC offset circuit, carry out flowing to the DC-AC converter after the power match through the electric energy that rectification circuit outputs to DC offset circuit with public electric wire net, guarantee that under the intervention of DC offset circuit the electric energy of DC-DC booster circuit is preferentially exported; When the not enough user of power output of DC-DC booster circuit used, the electric energy that DC offset circuit strengthens public electric wire net automatically replenished, to guarantee the electric energy output to the user; When DC-DC booster circuit power output was enough, from public electric wire net input electric energy, public electric wire net was not in Light Condition to DC offset circuit.This moment, single-chip microcomputer was exported electric energy by the direct current limit power transformation module that the 2nd DC-DC converter, second pwm control circuit, the second voltage feedback sense circuit and tertiary voltage feedback sense circuit constitute to combining inverter 5.Single-chip microcomputer is controlled second pwm control circuit according to the output signal of the 3rd current/voltage testing circuit, unnecessary electric energy is outputed to combining inverter 5 supply with public electric wire net 3.
The auxiliary grid-connected system of above-mentioned photovoltaic is worked under the scheduling of single-chip microcomputer, and as shown in Figure 3, the control job step is as follows:
Step 1: the 3rd current/voltage testing circuit detects the current and voltage signals of public electric wire net 3 outputs, and provides it to single-chip microcomputer;
Step 2: single-chip microcomputer judges the output of public electric wire net according to above-mentioned signal, as public electric wire net dead electricity execution in step 3 then, otherwise execution in step 7;
Step 3: single-chip microcomputer output control signal is closed second pwm control circuit,
Step 4: single-chip microcomputer output control signal is opened first pwm control circuit and the 3rd pwm control circuit;
Step 5: single-chip microcomputer output control signal is given and is exchanged commutation circuit and disconnect being connected of public electric wire net 3 and user load 4;
Step 6: single-chip microcomputer output control signal connects the output of DC-AC converter and being connected of user load 4 for the interchange commutation circuit, and independently-powered by 2 pairs of user loads 4 of photovoltaic module, execution in step 1 then;
Step 7: the first current/voltage testing circuit detects the current and voltage signals of photovoltaic module 2 outputs and provides it to single-chip microcomputer;
Step 8: whether single-chip microcomputer has output to judge according to above-mentioned signal to photovoltaic module, does not export then execution in step 9 as photovoltaic module 2, otherwise execution in step 11;
Step 9: single-chip microcomputer output control signal is closed first pwm control circuit, second pwm control circuit and the 3rd pwm control circuit;
Step 10: single-chip microcomputer output control signal is given and is exchanged commutation circuit connection public electric wire net 3 to user load 4, and independently-powered by 3 pairs of user loads 4 of public electric wire net, execution in step 1 then;
Step 11: the second current/voltage testing circuit detects the current and voltage signals of input user load and provides it to single-chip microcomputer;
Step 12: single-chip microcomputer detects the current and voltage signals of photovoltaic module 2 outputs that obtain according to above-mentioned signal and the first current/voltage testing circuit, the output of photovoltaic module and the power consumption of user load are compared, as 10% of the not enough user load power consumption of the output of photovoltaic module 2, then execution in step 13, otherwise execution in step 16;
Step 13: single-chip microcomputer output control signal is closed the 3rd pwm control circuit;
Step 14: single-chip microcomputer output control signal is opened first pwm control circuit and second pwm control circuit, and photovoltaic module 2 electricity are reverse into civil power input public electric wire net 3 by boosting, limit power transformation and combining inverter 5, and " storage " is in public electric wire net 3;
Step 15: single-chip microcomputer output control signal is given and is exchanged commutation circuit connection public electric wire net 3 to user load 4, and by 4 power supplies of 3 pairs of user loads of public electric wire net, execution in step 1 then;
Step 16: single-chip microcomputer output control signal is opened first pwm control circuit and the 3rd pwm control circuit;
Step 17: single-chip microcomputer output control signal connects the output of DC-AC converter and being connected of user load 4 for the interchange commutation circuit;
Step 18: the 3rd current/voltage testing circuit detects electric current and the voltage signal of public electric wire net 3 outputs and provides it to single-chip microcomputer;
Step 19: voltage detecting circuit detects the voltage signal of DC offset circuit output and provides it to single-chip microcomputer;
Step 20: single-chip microcomputer compares above-mentioned signal, judges whether the electric energy of photovoltaic module 2 outputs has more than needed.If the voltage of DC offset circuit output is greater than the voltage of public electric wire net 3 outputs, then the electric energy of photovoltaic module 2 outputs has more than needed; If the voltage of DC offset circuit output is not more than the voltage of public electric wire net 3 outputs, then the electric energy of photovoltaic module 2 outputs is not more than needed.In order to prevent erroneous judgement, preferably be that the electric current of public electric wire net 3 outputs is monitored simultaneously.If public electric wire net 3 output has electric current, then this moment public electric wire net 3 generating compensates to photovoltaic module, the electric energy of photovoltaic module 2 outputs is not more than needed; If output current is zero, represent that then the electric energy of photovoltaic module 2 outputs may have more than needed.
The electric energy of photovoltaic module 2 output has when more than needed, and control module output control signal is opened direct current limit power transformation module, electric energy more than needed is imported public electric wire nets 3 " storage " by combining inverter 5 get up.Wherein, more than needed the increase direct current is limit the power output of power transformation module, has more than needed after a little while for a long time, reduces the power output of direct current limit power transformation module.When not more than needed, control module output control signal is closed second pwm control circuit, namely closes direct current limit power transformation module.This moment, the electric energy of public electric wire net 3 outputs was imported DC offset circuit by rectification circuit, and the electric energy that photovoltaic module 2 is exported carries out DC compensation, and execution in step 1 then.

Claims (12)

1. one kind is used for the auxiliary controller that generates electricity by way of merging two or more grid systems of photovoltaic, it is characterized in that comprising with lower member:
The DC boosting module is connected with photovoltaic module, is used for the direct current that photovoltaic module produces is boosted, and its output is connected with DC compensation module, direct current limit power transformation module respectively;
Direct current limit power transformation module is connected with control module with the DC boosting module, and its output is connected with combining inverter, be used for according to control signal the electric energy more than needed of photovoltaic module output being exported to combining inverter, and then the input public electric wire net;
The DC compensation module, be connected with the DC boosting module with public electric wire net, be used for making the civil power of public electric wire net to compensate the direct current of DC boosting module output at the energy output of photovoltaic module during less than the power consumption of user load, and the direct current after will compensating exports to described ac converter module, and its output is connected with monitoring modular with the ac converter module respectively;
The ac converter module, its output is connected with user load, and the direct current inversion that is used for the output of DC compensation module is to export to user load behind the civil power;
Exchange handover module, be used for the control according to control module, the input current of user load is switched between public electric wire net and ac converter module;
Monitoring modular, be used for gathering the voltage signal of the current and voltage signals of public electric wire net output, the current and voltage signals of photovoltaic module output, the current and voltage signals that exchanges handover module output and the output of DC compensation module, and above-mentioned signal is sent to control module;
And control module, be connected with monitoring modular, be used for receiving the current and voltage signals of monitoring modular input and sending control signal according to above-mentioned signal and control DC boosting module, direct current limit power transformation module, ac converter module respectively and exchange handover module work.
2. controller as claimed in claim 1, it is characterized in that: described DC boosting module is made of the first voltage feedback sense circuit, a DC-DC converter and first pwm control circuit.
3. controller as claimed in claim 1 is characterized in that: described direct current limit power transformation module is made of the 2nd DC-DC converter, second pwm control circuit, the second voltage feedback sense circuit and tertiary voltage feedback sense circuit.
4. controller as claimed in claim 1, it is characterized in that: described DC compensation module is made of rectification circuit and DC offset circuit.
5. controller as claimed in claim 1, it is characterized in that: described ac converter module is made of DC-AC converter, the 3rd pwm control circuit and the 4th voltage feedback sense circuit.
6. controller as claimed in claim 6, it is characterized in that: described DC-AC converter comprises sinewave inverter and line filter, wherein said sinewave inverter adopts single-phase sinewave inverter or three-phase sine-wave inverter.
7. controller as claimed in claim 1 is characterized in that: described interchange handover module constitutes by exchanging commutation circuit.
8. controller as claimed in claim 1, it is characterized in that: described monitoring modular is made of the first current/voltage testing circuit, the second current/voltage testing circuit, the 3rd current/voltage testing circuit and voltage detecting circuit.
9. controller as claimed in claim 1, it is characterized in that: described control module is made of single-chip microcomputer and peripheral circuit thereof.
10. a photovoltaic is assisted grid-connected system, comprise photovoltaic module, public electric wire net, combining inverter and user load, wherein, described combining inverter is used for limitting the direct current of power transformation module output to be reverse into civil power input public electric wire net direct current, its output is connected with public electric wire net, it is characterized in that also comprising as the described arbitrary controller of claim 1 to 10.
11. photovoltaic as claimed in claim 10 is assisted grid-connected system, it is characterized in that: the energy output of described photovoltaic module is at least greater than 10% of the power consumption of user load.
12. photovoltaic as claimed in claim 10 is assisted grid-connected system, it is characterized in that: described combining inverter comprises single-phase grid-connected inverter or three-phase grid-connected inverter.
CN2013202008530U 2013-04-21 2013-04-21 Photovoltaic auxiliary grid-connected power generation controller and power generation system using same Expired - Fee Related CN203218892U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103178549A (en) * 2013-04-21 2013-06-26 胥明军 Control system and control method for photovoltaic auxiliary grid-connected power generation
CN104734177A (en) * 2013-12-24 2015-06-24 珠海格力电器股份有限公司 Grid-connected connecting device, control method thereof and grid-connected power supply system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103178549A (en) * 2013-04-21 2013-06-26 胥明军 Control system and control method for photovoltaic auxiliary grid-connected power generation
CN103178549B (en) * 2013-04-21 2016-05-25 胥明军 A kind of method of controlling the auxiliary grid-connected system generating of photovoltaic
CN104734177A (en) * 2013-12-24 2015-06-24 珠海格力电器股份有限公司 Grid-connected connecting device, control method thereof and grid-connected power supply system
CN104734177B (en) * 2013-12-24 2017-04-05 珠海格力电器股份有限公司 Grid-connected connection equipment and its control method and grid-connected electric power system

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