CN203895990U - Photovoltaic grid-connected system - Google Patents
Photovoltaic grid-connected system Download PDFInfo
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- CN203895990U CN203895990U CN201320861064.1U CN201320861064U CN203895990U CN 203895990 U CN203895990 U CN 203895990U CN 201320861064 U CN201320861064 U CN 201320861064U CN 203895990 U CN203895990 U CN 203895990U
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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
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Abstract
The utility model discloses a photovoltaic grid-connected system. The system comprises a photovoltaic power generation device which is used for outputting direct-current power; a bidirectional current converter which is connected between the photovoltaic power generation device and an alternating-current power grid; an inverter which is connected between the photovoltaic power generation device and an alternating-current load; first detection equipment which is disposed between the photovoltaic power generation device and the bidirectional current converter; second detection equipment which is disposed between the alternating-current power grid and the bidirectional current converter; third detection equipment which is disposed between the alternating-current load and the inverter; and an MPPT controller, wherein the input end of the MPPT controller is connected with the first detection equipment, the second detection equipment and the third detection equipment, and the output end of the MPPT controller is connected with the bidirectional current converter and the inverter. The system provided by the utility model solves the technical problem that the MPPT design of a conventional photovoltaic power generation system is not suitable for a photovoltaic grid-connected system integrating power generation and consumption.
Description
Technical field
The utility model relates to electric power transfer field, in particular to a kind of photovoltaic parallel in system.
Background technology
Solar energy, as a kind of energy of clean environment firendly, gets more and more people's extensive concerning, and over nearly more than 20 years, solar energy is widely used in each occasion.Solar energy power generating is a kind of important form that solar energy utilizes, the forms of electricity generation that is that to adopt photovoltaic module be electric energy by transform light energy, and also along with the continuous progress of technology, photovoltaic generation may be to have one of generation technology of development prospect most.
In photovoltaic generating system, the utilance of photovoltaic module is except outside the Pass having with the bulk properties of photovoltaic cell, is also subject to environment for use as the impact of irradiance, load and the factor such as stable.Under different external condition, photovoltaic module may operate on different and unique maximum power point.Therefore, MPPT maximum power point tracking technology MPPT (Maxiumum Power Point Tracking) is the important technology that luminous energy is converted into greatest extent to electric energy.
Current photovoltaic generating system is mainly to complete MPPT and control by carrying out loop design between the current/voltage of the output at photovoltaic module and electrical network, to realize the net synchronization capability index etc. of luminous energy electric energy and electrical network.Known accordingly, current photovoltaic generating system Main Function is generating, and its object is to be mainly to greatest extent and the electric energy of synchronized by transform light energy, and its load can be similar to thinks network system; Rear end load electricity consumption is to import after electrical network, by electrical network United Dispatching by solar energy converting electrical energy.Therefore the key that, MPPT controls only need ensure synchronizeing of photovoltaic electric energy and electrical network.
In the photovoltaic system of hair electricity one, load can not be approximately merely electrical network, rear end load need to be counted to consider directly and control, and its mode of operation is no longer also pure power generation mode, wherein, photovoltaic system need to switch in real time under various patterns, but the result that maintains the existing parameter control of MPPT can not ensure the control target of the stable and power factor sine-wave current of intermediate dc busbar voltage, that is to say, the MPPT of existing photovoltaic generating system designs and is not suitable for the photovoltaic parallel in system of hair electricity one.For this problem, effective solution is not yet proposed at present.
Utility model content
The utility model embodiment provides a kind of photovoltaic parallel in system, designs and be not suitable for the technical problem of the photovoltaic parallel in system of hair electricity one at least to solve the MPPT of existing photovoltaic generating system.
According to the utility model embodiment aspect, a kind of photovoltaic parallel in system is provided, comprising: photovoltaic power generation equipment, for exporting direct current power; Bi-directional inverter, is connected between above-mentioned photovoltaic power generation equipment and AC network, wherein, and the DC terminal of the corresponding above-mentioned bi-directional inverter of above-mentioned photovoltaic power generation equipment, the interchange end of the corresponding above-mentioned bi-directional inverter of above-mentioned AC network; Inverter, is connected between above-mentioned photovoltaic power generation equipment and AC load, wherein, and the DC terminal of the corresponding above-mentioned inverter of above-mentioned photovoltaic power generation equipment, the interchange end of the corresponding above-mentioned inverter of above-mentioned AC load; The first checkout equipment, is arranged between above-mentioned photovoltaic power generation equipment and above-mentioned bi-directional inverter, at least for detection of the output parameter of above-mentioned photovoltaic power generation equipment; The second checkout equipment, is arranged between above-mentioned AC network and above-mentioned bi-directional inverter, at least for detection of the synchronization parameter of above-mentioned AC network; The 3rd checkout equipment, is arranged between above-mentioned AC load and above-mentioned inverter, at least for detection of the match parameter of above-mentioned AC load; MPPT controller, the input end of above-mentioned MPPT controller connects above-mentioned the first checkout equipment, above-mentioned the second checkout equipment and above-mentioned the 3rd checkout equipment, the output end of above-mentioned MPPT controller connects above-mentioned bi-directional inverter and above-mentioned inverter, for according to above-mentioned output parameter and/or above-mentioned synchronization parameter and/or the above-mentioned bi-directional inverter of above-mentioned match parameter control and/or above-mentioned inverter.
Preferably, above-mentioned MPPT controller is for switching to multiple control models control model corresponding with above-mentioned annexation according to the annexation between above-mentioned AC network, above-mentioned AC load and above-mentioned photovoltaic power generation equipment.
Preferably, above-mentioned photovoltaic parallel in system also comprises: switching device shifter, be connected between above-mentioned AC network, above-mentioned AC load and above-mentioned photovoltaic power generation equipment, when arbitrary state at above-mentioned switching device shifter in multiple states, above-mentioned annexation switches to the annexation corresponding with above-mentioned arbitrary state.
Preferably, when the first state at above-mentioned switching device shifter in above-mentioned multiple states, above-mentioned photovoltaic power generation equipment disconnects and being connected of above-mentioned AC network and above-mentioned AC load, and above-mentioned MPPT controller switching is the idle mode in above-mentioned multiple control models extremely, and/or, when the second state at above-mentioned switching device shifter in above-mentioned multiple states, above-mentioned AC load disconnection is connected with above-mentioned photovoltaic power generation equipment and above-mentioned AC network, above-mentioned MPPT controller switching is to the power generation mode in above-mentioned multiple control models, for according to above-mentioned output parameter and the above-mentioned bi-directional inverter of above-mentioned synchronization parameter control, and/or, when the third state at above-mentioned switching device shifter in above-mentioned multiple states, above-mentioned AC network disconnection is connected with above-mentioned photovoltaic power generation equipment and above-mentioned AC load, above-mentioned MPPT controller switching is to the load model in above-mentioned multiple control models, for according to above-mentioned output parameter and the above-mentioned inverter of above-mentioned match parameter control, and/or, when the 4th state at above-mentioned switching device shifter in above-mentioned multiple states, above-mentioned photovoltaic power generation equipment connects above-mentioned AC network by above-mentioned bi-directional inverter, and connect above-mentioned AC load by above-mentioned inverter, above-mentioned MPPT controller switching is to load power generation mode or load power mode in above-mentioned multiple control models, wherein, under above-mentioned load power generation mode, above-mentioned MPPT controller is used for according to above-mentioned output parameter, above-mentioned synchronization parameter and the above-mentioned bi-directional inverter of above-mentioned match parameter control and/or above-mentioned inverter, and/or, in above-mentioned load with under power mode, above-mentioned MPPT controller is used for according to above-mentioned output parameter and the above-mentioned bi-directional inverter of above-mentioned match parameter control and/or above-mentioned inverter.
Preferably, above-mentioned switching device shifter comprise following one of at least: the first switching device, be connected between above-mentioned photovoltaic power generation equipment and DC bus, above-mentioned DC bus is the transmission line between above-mentioned bi-directional inverter and above-mentioned inverter; Second switch device, is connected between above-mentioned photovoltaic power generation equipment and above-mentioned AC network, and above-mentioned second switch device is arranged on above-mentioned DC bus; The 3rd switching device, is connected between above-mentioned photovoltaic power generation equipment and above-mentioned AC load, and above-mentioned the 3rd switching device is arranged on above-mentioned DC bus.
Preferably, above-mentioned photovoltaic parallel in system also comprises: mode controller, connect above-mentioned switching device shifter and above-mentioned MPPT controller, above-mentioned mode controller is used for controlling above-mentioned switching device shifter and switches between above-mentioned multiple states, and controls above-mentioned MPPT controller switching to the control model corresponding with above-mentioned annexation.
Capacity, the capacity of above-mentioned AC network and the above-mentioned switching device shifter of the volume controlled of above-mentioned AC load of the above-mentioned photovoltaic power generation equipment that preferably, above-mentioned mode controller detects for basis.
Preferably, above-mentioned photovoltaic parallel in system also comprises: the 4th checkout equipment, be arranged on DC bus, above-mentioned DC bus is the transmission line between above-mentioned bi-directional inverter and above-mentioned inverter, above-mentioned the 4th checkout equipment connects above-mentioned input end, wherein, above-mentioned MPPT controller for according to above-mentioned output parameter and/or above-mentioned synchronization parameter and/or above-mentioned match parameter and above-mentioned the 4th checkout equipment at the detected voltage of corresponding test point and/or the above-mentioned bi-directional inverter of Current Control and/or above-mentioned inverter.
Preferably, above-mentioned MPPT controller is for by one of the following above-mentioned bi-directional inverter of signal controlling and/or above-mentioned inverter: voltage signal, current signal, pulse-width signal.
Preferably, it is characterized in that, above-mentioned photovoltaic power generation equipment comprises: photovoltaic cell, unit and power supply unit conflux; And/or above-mentioned AC load comprises air conditioner; And/or the transmission line being connected between above-mentioned AC network and above-mentioned bi-directional inverter is three-phase power transmission line or Monophase electric power transmission line; And/or the transmission line being connected between above-mentioned AC load and above-mentioned inverter is three-phase power transmission line or Monophase electric power transmission line.
First, in the utility model embodiment, a kind of new framework of electric power system of hair electricity one has been proposed, the photovoltaic parallel in system that is applied to this framework can comprise the bi-directional inverter and the inverter that are connected in turn between AC network and AC load, and be connected to the photovoltaic power generation equipment between bi-directional inverter and inverter, wherein, this photovoltaic power generation equipment can be at a side direction electrical network transmission of electric energy, at opposite side to AC load transmission of electric energy, this AC network can be drawn electric energy from photovoltaic power generation equipment on the one hand, can power to AC load on the other hand, this has just formed the system of a hair electricity one, and because photovoltaic power generation equipment can be directly to AC load energy regenerative, that therefore can improve its electric energy producing directly drives utilance.
Further, in the utility model embodiment, the input end of MPPT controller can with correspond respectively to photovoltaic power generation equipment, the first checkout equipment of AC network and AC load, the second checkout equipment and the 3rd checkout equipment connect, to obtain at the corresponding voltage that test point was fed back, electric current, the relevant parameters such as power, thereby this MPPT controller can be according to the one or more output in these checkout equipments, also respectively in photovoltaic power generation equipment one side, the effective control of one or more realizations in the relevant parameter that AC network one side and AC load one side gather to bi-directional inverter and/or adverse current device, and then reach more excellent power supplying efficiency, thereby the MPPT that has solved existing photovoltaic generating system designs and is not suitable for the technical problem of the photovoltaic parallel in system of hair electricity one.
Brief description of the drawings
Accompanying drawing described herein is used to provide further understanding of the present utility model, forms the application's a part, and schematic description and description of the present utility model is used for explaining the utility model, does not form improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is according to the schematic diagram of a kind of optional photovoltaic parallel in system of the utility model embodiment;
Fig. 2 is according to the schematic diagram of a kind of MPPT control program of prior art;
Fig. 3 is according to the schematic diagram of the optional photovoltaic parallel in system of another kind of the utility model embodiment.
Embodiment
Hereinafter also describe the utility model in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, in the situation that not conflicting, the feature in embodiment and embodiment in the application can combine mutually.
Embodiment 1
According to the utility model embodiment, a kind of photovoltaic parallel in system is provided, as shown in Figure 1, this equipment comprises:
1) photovoltaic power generation equipment 102, for exporting direct current power;
2) bi-directional inverter 104, is connected between photovoltaic power generation equipment 102 and AC network 106, wherein, and the DC terminal of the corresponding bi-directional inverter 104 of photovoltaic power generation equipment 102, the interchange end of the corresponding bi-directional inverter 104 of AC network 106;
3) inverter 108, is connected between photovoltaic power generation equipment 102 and AC load 110, wherein, and the DC terminal of the corresponding inverter 108 of photovoltaic power generation equipment 102, the interchange end of the corresponding inverter 108 of AC load 110;
4) the first checkout equipment 112, is arranged between photovoltaic power generation equipment 102 and bi-directional inverter 104, at least for detection of the output parameter of photovoltaic power generation equipment 102;
5) the second checkout equipment 114, is arranged between AC network 106 and bi-directional inverter 104, at least for detection of the synchronization parameter of AC network 106;
6) the 3rd checkout equipment 116, is arranged between AC load 110 and inverter 108, at least for detection of the match parameter of AC load 110;
7) MPPT controller 118, the input end of MPPT controller 118 connects the first checkout equipment 112, the second checkout equipment 114 and the 3rd checkout equipment 116, the output end of MPPT controller 118 connects bi-directional inverter 104 and inverter 108, for according to output parameter and/or synchronization parameter and/or match parameter control bi-directional inverter 104 and/or inverter 108.
Will be clear that, one of technical solutions of the utility model problem to be solved is to provide a kind of grid-connected system, to realize grid-connected to AC network 106 of photovoltaic power generation equipment 102, also be, the electric energy that this photovoltaic power generation equipment 102 can be provided more efficiently imports in AC network 106, and make AC network 106 can effectively dispatch these electric energy, and then improve the power supply capacity of AC network 106.
For addressing the above problem, the photovoltaic parallel in system providing according to the utility model embodiment, be different from common the adopted inverter between photovoltaic power generation equipment 102 and AC network 106 that is connected in prior art, in the utility model embodiment, between photovoltaic power generation equipment 102 and AC network 106, can be connected with bi-directional inverter 104, thereby can realize the supply of electric energy to electrical network by this bi-directional inverter 104, particularly, can show as the lifting of output power, wherein, the effect that this alternative plays by after embodiment in elaborate.
Particularly, in the utility model embodiment, this photovoltaic power generation equipment 102 can comprise photovoltaic cell conventionally, unit and power supply unit conflux, wherein, photovoltaic cell is for being directly converted to electric energy by solar energy, such as adopting conventional silicon photocell etc., the electric energy that unit produces photovoltaic battery array that confluxes plays the effect of collecting, such as adopting conventional header box, power supply unit is for DC distribution, also can adopt conventional power distribution cabinet etc., but the utility model is not construed as limiting to this.
Further, for making the AC energy that photovoltaic power generation equipment 102 provides by bi-directional inverter 104 reach and synchronize with the electric energy of AC network 106, and make photovoltaic power generation equipment 102 reach more excellent power output point, in embodiment more of the present utility model, the mode that can adopt MPPT controller 118 to control bi-directional inverter 104 realizes the modulation to the electric energy of AC network 106 feedbacks to photovoltaic power generation equipment 102, and then realizes the lifting to grid connection efficiency.
In the utility model embodiment, the input parameter of MPPT controller 118 can be the output that comes from above-mentioned the first checkout equipment 112 and the second checkout equipment 114, wherein, the output of the first checkout equipment 112 can be that this first checkout equipment 112 is at its test point, also be near the detected electrical parameter of output of photovoltaic power generation equipment 102, be designated as output parameter, the output of the second checkout equipment 114 can be that this second checkout equipment 114 is at its test point, also be near the detected at least electrical parameter including synchronization parameter of incoming end of AC network 106, the energy regenerative efficiency that this synchronization parameter reaches more excellent for synchronizeing between photovoltaic transmission of electricity and electrical network, wherein, above-mentioned electrical parameter can be both voltage, also can be electric current, the parameter relevant to photovoltaic power generation equipment 102 and/or electric energy that AC network 106 provided or drew that can also be power of drawing on this basis of checkout equipment etc., accordingly, this first checkout equipment 112 and the second checkout equipment 114 can comprise voltage sensor and/or current sensor etc., wherein, particularly, the concrete manifestation form of the electrical parameter being fed back by these checkout equipments can be the signal of telecommunication of these checkout equipment outputs, and then MPPT controller 118 can be realized the collection to these electrical parameters by the input end being connected with these checkout equipments.More specifically, in the utility model embodiment, the input end of MPPT controller 118 can be the terminal board that at least comprises three links, wherein, these three links can connect respectively the first checkout equipment 112, the second checkout equipment 114 and the 3rd checkout equipment 116, the 3rd checkout equipment 116 is arranged on AC load 110, and the working method that it is concrete and the first checkout equipment 112 and the second checkout equipment 114 are similar, and the utility model is not done tired stating at this.
It should be noted that, the internal structure of the utility model to above-mentioned three checkout equipments and concrete connected mode in the line thereof are not limited in any way, for example, in the utility model embodiment, current sensor in these checkout equipments can be the electromagnetic current transducer being connected in detection line, also can be Hall element etc., wherein, the specific implementation of these checkout equipments can't impact the realization of the enforcement of technical solutions of the utility model and technique effect thereof, also should not be construed as restriction of the present utility model.
Similarly, in the utility model embodiment, the specific implementation of MPPT controller 118 also can adopt be similar in prior art, exist for realizing circuit or the device of above-mentioned control function, for example, a kind of three ring control structures of typically controlling for MPPT can be as shown in Figure 2, wherein, the input parameter of this MPPT controller 118 can be the voltage and current that gathers in photovoltaic power generation equipment 102 1 sides and the voltage and/or the electric current that gather in AC network 106 1 sides as synchronizing signal, its output parameter can be for the DC/DC transducer of control inverter 202 and the pulse-width signal of DC/AC transducer, thereby this MPPT can be according to synchronous situation to pulse-width signal, such as its duty ratio is adjusted, and then realize the adjusting of the interchange output that inverter 202 is produced.Certainly, it is more than a kind of example, the utility model is not construed as limiting this, for example, in embodiment more of the present utility model, the output of MPPT controller 118 also can be not limited to the form of pulse, such as realizing by the analog signal such as voltage signal or current signal the control of the output of the inverter 202 to being connected with photovoltaic power generation equipment 102, also be, in the utility model embodiment, MPPT controller 118 is by one of following signal controlling bi-directional inverter 104 and/or inverter 108: voltage signal, current signal, pulse-width signal.In addition, this MPPT controller 118 can also be realized in conjunction with the control logic of writing controller chip the tracking of maximum power point, realizes the dynamic tracking to maximum power point such as passing through output voltage and/or the amplitude of electric current and/or the scanning of phase place, etc.Should be understood that, above-mentioned execution mode of the present utility model all should be considered as within protection range of the present utility model.
By the technical scheme described in above-described embodiment, can realize effectively grid-connected to AC network 106 of photovoltaic power generation equipment 102, wherein, the framework that such scheme similarly to the prior art provides may be summarized to be photovoltaic power generation equipment 102 and powers to AC network 106, and then AC network 106 after dilatation goes to connect each AC load 110 again.In traditional electricity generation system, this framework can reach comparatively desirable power supplying efficiency, but in the system of hair electricity one, because the load of photovoltaic power generation equipment 102 can not merely be approximately electrical network, also need to consider the impact of rear end load on its power supplying efficiency, this just makes traditional MPPT design cannot meet the designing requirement that in the system of the electric one of hair more complicated in influencing factor, converter is control effectively the power supplying efficiency that reaches more excellent.
For this problem, in the utility model embodiment, first a kind of new framework has been proposed, particularly, above-mentioned photovoltaic parallel in system can also comprise AC load 110, wherein, between above-mentioned photovoltaic power generation equipment 102 and AC load 110, can be connected with inverter 108, thereby photovoltaic power generation equipment 102 can be at a side direction electrical network transmission of electric energy, at opposite side to AC load 110 transmission of electric energy, this has just formed the system of a hair electricity one, and because photovoltaic power generation equipment 102 can be directly to AC load 110 energy regeneratives, that therefore can improve its electric energy producing directly drives utilance.Further, in the utility model embodiment, the input end of MPPT controller 118 can also be connected with the 3rd checkout equipment 116 of the incoming end that is arranged on this AC load 110, to gather the voltage relevant to AC load 110, electric current, the electrical parameters such as power, for reflecting the match condition of AC load 110 and photovoltaic power supply equipment and AC network 106, be designated as match parameter, thereby this MPPT controller 118 can be according to the one or more output in these checkout equipments, also respectively in photovoltaic power generation equipment 102 1 sides, the effective control of one or more realizations in the electrical parameter that AC network 106 1 sides and AC load 110 1 sides gather to bi-directional inverter 104 and/or adverse current device, and then reach more excellent power supplying efficiency.
On basis described above, for realizing further the more efficiently control of the system to hair electricity one, in the above-mentioned photovoltaic parallel in system providing according to the utility model embodiment, can also be provided with switching device shifter, and then the switching of the system that can realize hair electricity one by this switching device shifter between different application models, to reach the capacity at photovoltaic power generation equipment 102, between the capacity of the capacity of AC network 106 and AC load 110, carry out the object of coupling flexibly, wherein, this switching device shifter can be connected to AC network 106, between AC load 110 and photovoltaic power generation equipment 102, when arbitrary state at switching device shifter in multiple states, AC network 106, annexation between AC load 110 and photovoltaic power generation equipment 102 can switch to the annexation corresponding with arbitrary state.On the other hand, MPPT controller 118 also can coordinate switching device shifter to carry out the control strategy corresponding with application model, thereby can reach more excellent power supplying efficiency, also be, in the utility model embodiment, above-mentioned MPPT controller 118 can also be used for switching to multiple control models control model corresponding with annexation according to the annexation between AC network 106, AC load 110 and photovoltaic power generation equipment 102.For example, as a kind of feasible execution mode, in the utility model embodiment, above-mentioned photovoltaic parallel in system can comprise:
1) switching device shifter, is connected between AC network 106, AC load 110 and photovoltaic power generation equipment 102;
Wherein,
When the first state at switching device shifter in multiple states, photovoltaic power generation equipment 102 disconnects and being connected of AC network 106 and AC load 110, and MPPT controller 118 can switch to the idle mode in multiple control models; And/or,
When the second state at switching device shifter in multiple states, AC load 110 disconnections are connected with photovoltaic power generation equipment 102 and AC network 106, MPPT controller 118 can switch to the power generation mode in multiple control models, for according to output parameter and synchronization parameter control bi-directional inverter 104; And/or,
When the third state at switching device shifter in multiple states, AC network 106 disconnections are connected with photovoltaic power generation equipment 102 and AC load 110, MPPT controller 118 can switch to the load model in multiple control models, for according to output parameter and match parameter control inverter 108; And/or,
When the 4th state at switching device shifter in multiple states, photovoltaic power generation equipment 102 is connected AC network 106 and is connected AC load 110 by inverter 108 by bi-directional inverter 104, MPPT controller 118 can switch to load power generation mode or the load power mode in multiple control models, wherein
Under load power generation mode, MPPT controller 118 is for according to output parameter, synchronization parameter and match parameter control bi-directional inverter 104 and/or inverter 108, and/or, in load, with under power mode, MPPT controller 118 is for according to output parameter and match parameter control bi-directional inverter 104 and/or inverter 108.
In the utility model embodiment, at switching device shifter during in the first state, AC network 106 is connected by bi-directional inverter 104 and inverter 108 with AC load 110, wherein, electric energy can first be converted to direct current by this bi-directional inverter 104 by interchange, and then by inverter 108, direct current is converted to interchange, to supply with AC load 110, under this scene, bi-directional inverter 104 is as rectifier work.Wherein, photovoltaic power generation equipment 102 all disconnects with AC network 106 and AC load 110, AC network 106 is born the power supply to AC load 110 completely, photovoltaic power generation equipment 102 is not exported electric energy, therefore only need to consider mating between AC load 110 characteristics and AC network 106, and without the regulating action of bringing into play the power supplying efficiency of MPPT controller 118 to photovoltaic power generation equipment 102, MPPT controller 118 can be operated in holding state Light Condition in other words.
At switching device shifter during in the second state, photovoltaic power generation equipment 102 connects AC network 106 by bi-directional inverter 104, wherein, electric energy can be converted to interchange by direct current by this bi-directional inverter 104, to realize the energy regenerative of photovoltaic power generation equipment 102 to AC network 106, under this scene, bi-directional inverter 104 is worked as inverter 108.Wherein, AC load 110 all disconnects with photovoltaic power generation equipment 102 and AC network 106, AC load 110 not electricity consumptions, the electric energy that photovoltaic power generation equipment 102 produces imports AC network 106 completely, therefore only need to consider synchronizeing and the maximization of power supplying efficiency of photovoltaic power generation equipment 102 and AC network 106, thereby MPPT controller 118 can be operated in traditional mode power generation mode in other words, wherein, the control parameter of MPPT is output parameter and the synchronized parameter of photovoltaic power generation equipment 102, also the i.e. output of the first checkout equipment 112 and the second checkout equipment 114.
At switching device shifter, during in the second state, photovoltaic power generation equipment 102 connects AC network 106 by inverter 108, and wherein, electric energy can be converted to interchange by direct current by this inverter 108, to realize the power supply of photovoltaic power generation equipment 102 to AC load 110.Wherein, AC network 106 all disconnects with photovoltaic power generation equipment 102 and AC load 110, AC network 106 neither imports electric energy from photovoltaic power generation equipment 102, also do not power to AC load 110, the electric energy that photovoltaic power generation equipment 102 produces is completely for driving AC load 110, therefore only need to consider mating of photovoltaic power generation equipment 102 and AC load 110, thereby MPPT controller 118 can be operated in load model, wherein, the control parameter of MPPT is the output parameter of photovoltaic power generation equipment 102 and the match parameter of AC load, also the i.e. output of the first checkout equipment 112 and the 3rd checkout equipment 116.
At switching device shifter during in the 4th state, photovoltaic power generation equipment 102 is connected AC network 106 and is connected AC load 110 by inverter 108 by bi-directional inverter 104, this annexation correspondence two kinds of application models of the system of hair electricity one: 1) load power mode, the capacity of DC power generation system is less than the capacity of AC load 110, AC network 106 also needs to power to AC load 110, and bi-directional inverter 104 is as rectifier work; 2) load power generation mode, the capacity of DC power generation system is greater than the capacity of AC load 110, the electric energy that this DC power generation system produces can a part be supplied with AC load 110, and another part imports AC network 106, and bi-directional inverter 104 is worked as inverter 108.Accordingly, the mode of operation of MPPT controller 118 also can be corresponding with above-mentioned two kinds of patterns: 1) in load with under power mode, because photovoltaic power generation equipment 102 is not to AC network 106 energy regeneratives, therefore the output parameter of this photovoltaic power generation equipment 102 is without synchronizeing with AC network 106, but still need to guarantee mating of photovoltaic power generation equipment 102 and AC load 110, wherein, the control parameter of MPPT can be the match parameter of output and the load of photovoltaic power generation equipment 102, also the i.e. output of the first checkout equipment 112 and the 3rd checkout equipment 116; 2) under load power generation mode, because photovoltaic power generation equipment 102 also needs to AC network 106 energy regeneratives in supplying with AC load 110, what the target that therefore MPPT controls not only needed this photovoltaic power generation equipment 102 and AC network 106 mates, also needs mating of this photovoltaic power generation equipment 102 and AC load 110, thereby the control parameter of MPPT can comprise output, the relevant parameter of AC network 106 and the relevant parameter of AC load 110 of photovoltaic power generation equipment 102, also i.e. the first output to the 3rd checkout equipment 116.
By the switching device shifter in above-mentioned photovoltaic parallel in system, can make the system works of hair electricity one under one or more patterns.More specifically, in the utility model embodiment, above-mentioned switching device shifter can have multiple implementation, and wherein, the most basically, this switching device shifter can be realized by switching device, example as shown in Figure 3, this switching device shifter can comprise following one of at least:
1) the first switching device 302, is connected between photovoltaic power generation equipment 102 and DC bus, and DC bus is the transmission line between bi-directional inverter 104 and inverter 108;
2) second switch device 304, be connected between photovoltaic power generation equipment 102 and AC network 106, and second switch device 304 is arranged on DC bus;
3) the 3rd switching device 306, is connected between photovoltaic power generation equipment 102 and AC load 110, and the 3rd switching device 306 is arranged on DC bus.
Wherein, the first switching device 302, second switch device 304 and the 3rd switching device 306 correspond respectively to the photovoltaic power generation equipment 102 in above-mentioned photovoltaic parallel in system, AC network 106 and AC load 110, thereby in the time that the first switching device 302 disconnects, photovoltaic power generation equipment 102 disconnects, switching device shifter just can switch to above-mentioned the first state, in the time that second switch device 304 disconnects, AC network 106 disconnects, switching device shifter just can switch to the third state, in the time that the 3rd switching device 306 disconnects, AC load 110 disconnects, switching device shifter just can switch to the second state.More specifically, these switching devices can be both the semiconductor switchs such as the IGBT being driven by push-pull amplifier, also can comprise that high power switch by chip controls is as relay, contactor etc., and the utility model is not limited in any way this.
It should be noted that, realizing above-mentioned switching device shifter by one or more in above-mentioned three switching devices is not the unique execution mode of the utility model, also should not be construed as the utility model has been formed to restriction, for example, in embodiment more of the present utility model, above-mentioned three switching devices can also form as one, such as being substituted by a selector switch or selector, etc.Should be understood that, the equivalence of this type of the utility model execution mode or obviously modification all should be considered as within protection range of the present utility model.
Further, for reducing the power consumption of the first to the 3rd checkout equipment 116 and/or MPPT controller 118, in the utility model embodiment, above-mentioned photovoltaic parallel in system can also comprise following one of at least:
1) the 4th switching device, one end connects input end, and the other end is used for connecting the first checkout equipment 112;
2) the 5th switching device, one end connects input end, and the other end is used for connecting the second checkout equipment 114;
3) the 6th switching device, one end connects input end, and the other end is used for connecting the 3rd checkout equipment 116.
Wherein, by the 4th to the 6th switch, can under a certain state and pattern, corresponding checkout equipment be connected with the input end of MPPT controller 118, this on the one hand can energy efficient, on the other hand can also be by cutting off unnecessary signal transmssion line to reduce the interference of signal transmssion line to transmitting required electrical parameter, thus realize the optimization further of the system to hair electricity one.
Further, in the utility model embodiment, above-mentioned photovoltaic parallel in system can also comprise:
1) mode controller, connection switching apparatus and MPPT controller 118, mode controller is used for controlling switching device shifter and switches between multiple states, and controls MPPT controller 118 and switch to the control model corresponding with AC network 106, AC load 110 and annexation between photovoltaic power generation equipment 102.
Generally speaking, in the utility model embodiment, mode controller can adopt the design of control loop in conjunction with power component, but the utility model is not construed as limiting this, wherein, this mode controller and MPPT controller 118 both can be independent separately, also can form as one, occur such as can be used as an integrated manipulator, wherein, this integrated manipulator also can comprise two-stage control loop.Particularly, for previous embodiment, mode controller can be controlled the first to the 3rd switching device, further, this mode controller also can be controlled the 4th to the 6th switch in the lump, this depends on the requirement to control integration degree in embodiment of the present utility model, and the utility model is not construed as limiting this.More specifically, in the utility model embodiment, mode controller can be according to the volume controlled switching device shifter of the capacity of the capacity of the photovoltaic power generation equipment 102 detecting, AC network 106 and AC load 110, for example, can be according to photovoltaic priority principle, by the maximizing efficiency of photovoltaic power generation equipment 102, but the utility model is not construed as limiting this.
On basis described above, consider further the DC link between bi-directional inverter 104 and inverter 108 is provided in the framework providing according to the utility model embodiment, play in other words the electric energy stability requirement of transmitting on the DC bus of shunting or the effect of confluxing, in the utility model embodiment, above-mentioned photovoltaic parallel in system can also comprise:
1) the 4th checkout equipment, be arranged on DC bus, DC bus is the transmission line between bi-directional inverter 104 and inverter 108, the 4th checkout equipment connects input end, wherein, MPPT controller 118 for according to output parameter and/or synchronization parameter and/or match parameter and the 4th checkout equipment at the detected voltage of corresponding test point and/or Current Control bi-directional inverter 104 and/or inverter 108.
In the utility model embodiment, other aforementioned input parameters of controlling electrical parameter on the DC bus of target and this MPPT controller 118 as MPPT can come from one or more in first to fourth checkout equipment simultaneously, and its control object can be still bi-directional inverter 104 and/or inverter 108, wherein, concrete control strategy can adopt the control mode of state space conventionally, but the utility model is not construed as limiting this.
Pass through above-described embodiment, technical solutions of the utility model and operation principle thereof are set forth, but it should be noted that, above-described embodiment is only for the understanding to technical solutions of the utility model, can't form any unnecessary restriction to the utility model, for example, Fig. 3 has provided a kind of feasible annexation of the first to the 3rd switching device, but in other embodiment of the present utility model, second switch device 304 and the 3rd switching device 306 also can be separately positioned on the outside of input/output port and inverter 108, etc.
Further it should be noted that, in the utility model embodiment, connecting line in Fig. 1 and Fig. 3 is only illustrated as the one of the annexation between each device, and do not mean that the transmission line that these connecting lines are corresponding in embodiment of the present utility model only limits to one, particularly, in the utility model embodiment, be connected between AC network 106 and bi-directional inverter 104, and the transmission line being connected between AC load 110 and inverter 108 can be three-phase power transmission line, and be connected between bi-directional inverter 104 and adverse current device, and the transmission line being connected between the two and photovoltaic power generation equipment 102 can be DC link.Certainly, this is a kind of example, in embodiment more of the present utility model, the transmission line that is connected between AC network 106 and bi-directional inverter 104 and be connected between AC load 110 and inverter 108 can be also the carrier of other AC power transmission such as Monophase electric power transmission line, and the utility model is not construed as limiting this.
In addition, in the utility model embodiment, the concrete form of AC load 110 can have multiple, it can be considered as representing to be connected to the entirety of the load in photovoltaic parallel in system, and to be not limited to be a certain specific type, wherein, in laod network, can be connected with multiple AC load 110 or sub-network, its concrete topological structure can have multiple, this can determine according to the concrete application of photovoltaic parallel in system, for example, for photovoltaic air-conditioning network, its load driving can comprise air conditioner, the power-equipment of air conditioner inside is such as centrifugal compressor etc. in other words, this does not affect the enforcement of technical solutions of the utility model and the realization of technique effect thereof, the utility model is not also limited in any way this.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.
Claims (10)
1. a photovoltaic parallel in system, is characterized in that, comprising:
Photovoltaic power generation equipment, for exporting direct current power;
Bi-directional inverter, is connected between described photovoltaic power generation equipment and AC network, wherein, and the DC terminal of the corresponding described bi-directional inverter of described photovoltaic power generation equipment, the interchange end of the corresponding described bi-directional inverter of described AC network;
Inverter, is connected between described photovoltaic power generation equipment and AC load, wherein, and the DC terminal of the corresponding described inverter of described photovoltaic power generation equipment, the interchange end of the corresponding described inverter of described AC load;
The first checkout equipment, is arranged between described photovoltaic power generation equipment and described bi-directional inverter, at least for detection of the output parameter of described photovoltaic power generation equipment;
The second checkout equipment, is arranged between described AC network and described bi-directional inverter, at least for detection of the synchronization parameter of described AC network;
The 3rd checkout equipment, is arranged between described AC load and described inverter, at least for detection of the match parameter of described AC load;
MPPT controller, the input end of described MPPT controller connects described the first checkout equipment, described the second checkout equipment and described the 3rd checkout equipment, the output end of described MPPT controller connects described bi-directional inverter and described inverter, for according to bi-directional inverter and/or described inverter described in described output parameter and/or described synchronization parameter and/or described match parameter control.
2. photovoltaic parallel in system according to claim 1, it is characterized in that, described MPPT controller is for switching to multiple control models control model corresponding with described annexation according to the annexation between described AC network, described AC load and described photovoltaic power generation equipment.
3. photovoltaic parallel in system according to claim 2, is characterized in that, also comprises:
Switching device shifter, is connected between described AC network, described AC load and described photovoltaic power generation equipment, and when arbitrary state at described switching device shifter in multiple states, described annexation switches to the annexation corresponding with described arbitrary state.
4. photovoltaic parallel in system according to claim 3, is characterized in that,
When the first state at described switching device shifter in described multiple states, described photovoltaic power generation equipment disconnects and being connected of described AC network and described AC load, and described MPPT controller switching is the idle mode in described multiple control models extremely; And/or,
When the second state at described switching device shifter in described multiple states, described AC load disconnection is connected with described photovoltaic power generation equipment and described AC network, described MPPT controller switching is to the power generation mode in described multiple control models, for according to bi-directional inverter described in described output parameter and described synchronization parameter control; And/or,
When the third state at described switching device shifter in described multiple states, described AC network disconnection is connected with described photovoltaic power generation equipment and described AC load, described MPPT controller switching is to the load model in described multiple control models, for according to inverter described in described output parameter and described match parameter control; And/or,
When the 4th state at described switching device shifter in described multiple states, described photovoltaic power generation equipment is connected described AC network and is connected described AC load by described inverter by described bi-directional inverter, described MPPT controller switching is to load power generation mode or load power mode in described multiple control models, wherein
Under described load power generation mode, described MPPT controller is used for according to bi-directional inverter and/or described inverter described in described output parameter, described synchronization parameter and described match parameter control, and/or, in described load, with under power mode, described MPPT controller is used for according to bi-directional inverter and/or described inverter described in described output parameter and described match parameter control.
5. photovoltaic parallel in system according to claim 3, is characterized in that, described switching device shifter comprise following one of at least:
The first switching device, is connected between described photovoltaic power generation equipment and DC bus, and described DC bus is the transmission line between described bi-directional inverter and described inverter;
Second switch device, is connected between described photovoltaic power generation equipment and described AC network, and described second switch device is arranged on described DC bus;
The 3rd switching device, is connected between described photovoltaic power generation equipment and described AC load, and described the 3rd switching device is arranged on described DC bus.
6. photovoltaic parallel in system according to claim 3, is characterized in that, also comprises:
Mode controller, connects described switching device shifter and described MPPT controller, and described mode controller is used for controlling described switching device shifter and switches between described multiple states, and controls described MPPT controller switching to the control model corresponding with described annexation.
7. photovoltaic parallel in system according to claim 6, is characterized in that, described mode controller is used for according to switching device shifter described in capacity, the capacity of described AC network and the volume controlled of described AC load of the described photovoltaic power generation equipment detecting.
8. according to the photovoltaic parallel in system described in any one in claim 1 to 7, it is characterized in that, also comprise:
The 4th checkout equipment, be arranged on DC bus, described DC bus is the transmission line between described bi-directional inverter and described inverter, described the 4th checkout equipment connects described input end, wherein, described MPPT controller for according to described output parameter and/or described synchronization parameter and/or described match parameter and described the 4th checkout equipment at bi-directional inverter and/or described inverter described in the detected voltage of corresponding test point and/or Current Control.
9. according to the photovoltaic parallel in system described in any one in claim 1 to 5, it is characterized in that, described MPPT controller is for bi-directional inverter and/or described inverter described in the signal controlling by one of following: voltage signal, current signal, pulse-width signal.
10. according to the photovoltaic parallel in system described in any one in claim 1 to 5, it is characterized in that,
Described photovoltaic power generation equipment comprises: photovoltaic cell, unit and power supply unit conflux; And/or,
Described AC load comprises air conditioner; And/or,
The transmission line being connected between described AC network and described bi-directional inverter is three-phase power transmission line or Monophase electric power transmission line; And/or,
The transmission line being connected between described AC load and described inverter is three-phase power transmission line or Monophase electric power transmission line.
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| CN201320861064.1U CN203895990U (en) | 2013-12-24 | 2013-12-24 | Photovoltaic grid-connected system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016004896A1 (en) * | 2014-07-11 | 2016-01-14 | 珠海格力电器股份有限公司 | Photovoltaic inverter and air conditioner |
| CN107612037A (en) * | 2017-10-30 | 2018-01-19 | 云南电网有限责任公司西双版纳供电局 | A kind of substation photovoltaic grid-connecting apparatus |
| CN107658900A (en) * | 2013-12-24 | 2018-02-02 | 珠海格力电器股份有限公司 | Photovoltaic parallel in system |
-
2013
- 2013-12-24 CN CN201320861064.1U patent/CN203895990U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107658900A (en) * | 2013-12-24 | 2018-02-02 | 珠海格力电器股份有限公司 | Photovoltaic parallel in system |
| CN104734181B (en) * | 2013-12-24 | 2018-04-13 | 珠海格力电器股份有限公司 | Photovoltaic parallel in system |
| CN107658900B (en) * | 2013-12-24 | 2020-12-22 | 珠海格力电器股份有限公司 | Photovoltaic grid-connected system |
| WO2016004896A1 (en) * | 2014-07-11 | 2016-01-14 | 珠海格力电器股份有限公司 | Photovoltaic inverter and air conditioner |
| CN107612037A (en) * | 2017-10-30 | 2018-01-19 | 云南电网有限责任公司西双版纳供电局 | A kind of substation photovoltaic grid-connecting apparatus |
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