CN214755540U - Photovoltaic power generation system - Google Patents
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- CN214755540U CN214755540U CN202120922488.9U CN202120922488U CN214755540U CN 214755540 U CN214755540 U CN 214755540U CN 202120922488 U CN202120922488 U CN 202120922488U CN 214755540 U CN214755540 U CN 214755540U
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Abstract
本实用新型公开一种光伏发电系统，包括光伏组件、汇流箱、光伏逆变器、变压器和储能装置；所述光伏组件连接汇流箱，所述汇流箱通过公共直流母线分别与光伏逆变器和储能装置相连，所述光伏逆变器连接变压器，所述变压器连接电网。系统工作时，因在直流母线处加入储能装置，对光伏发电起到平抑波动，将发电效率高时的多余电能储存在储能装置中，并在发电效率低的时候通过储能装置放电，以此降低发电量的波动，保持稳定的作用。改善了光伏并网发电的电能质量，提高了电网对光伏发电的消纳能力。
The utility model discloses a photovoltaic power generation system, comprising a photovoltaic component, a combiner box, a photovoltaic inverter, a transformer and an energy storage device; the photovoltaic component is connected with a combiner box, and the combiner box is respectively connected with the photovoltaic inverter through a common DC bus. Connected to the energy storage device, the photovoltaic inverter is connected to a transformer, and the transformer is connected to the power grid. When the system is working, because the energy storage device is added at the DC bus, it can stabilize the fluctuation of photovoltaic power generation, store the excess electric energy when the power generation efficiency is high in the energy storage device, and discharge it through the energy storage device when the power generation efficiency is low. This reduces the fluctuation of power generation and maintains a stable effect. The power quality of photovoltaic grid-connected power generation is improved, and the capacity of the grid to absorb photovoltaic power generation is improved.
Description
Technical Field
The utility model belongs to the technical field of the new forms of energy, in particular to photovoltaic power generation system.
Background
Under the background of rapid development of new energy, the installed capacity of photovoltaic power generation is rapidly increased, and reaches 25343 ten thousand kilowatts in 2020, which is increased by 24.1 percent compared with the last year. The photovoltaic power generation system has the remarkable characteristics that: the method is influenced by factors such as environment temperature, illumination and the like, and has randomness and volatility; secondly, the generated electric energy can be used only by being converted by a power electronic device.
At present, a grid-connected photovoltaic power generation system mainly comprises a photovoltaic module, a combiner box, a photovoltaic inverter, an isolation transformer and the like. The following functions are mainly realized: the voltage control function of the direct current bus is stable and rapid; the maximum power point tracking function is achieved; the power factor adjusting function of the alternating current side is achieved; the total harmonic content and each subharmonic content of the grid-connected current meet the specified standard of the power grid; the device has a zero voltage ride through function and provides a quick reactive power support function; the anti-islanding protection function is achieved; the fault protection device has the functions of perfect, reliable and quick fault protection. But the system cannot adjust the randomness and the volatility of the photovoltaic power generation system.
The existing grid-connected photovoltaic power generation system has the problem that the photovoltaic power generation amount changes along with the fluctuation and intermittence of solar radiation, and cannot stably supply power and needs to be connected with a power grid in parallel. This limits the development of photovoltaic power generation and increases the construction cost of photovoltaic power generation.
SUMMERY OF THE UTILITY MODEL
In order to compensate for the deficiencies of the prior art, the utility model aims to provide a photovoltaic power generation system. The energy storage device is added in a direct current bus of the photovoltaic power generation system to stabilize fluctuation of photovoltaic power generation, redundant electric energy generated when the power generation efficiency is high is stored in the energy storage device, and the electric energy is discharged through the energy storage device when the power generation efficiency is low, so that fluctuation of generated energy is reduced, and stability is kept.
In order to achieve the above object, the utility model discloses a following technical scheme realizes:
a photovoltaic power generation system comprises a photovoltaic assembly, a combiner box, a photovoltaic inverter, a transformer and an energy storage device;
the photovoltaic module is connected with the combiner box, the combiner box is respectively connected with the photovoltaic inverter and the energy storage device through a public direct current bus, the photovoltaic inverter is connected with the transformer, and the transformer is connected with the power grid.
The utility model discloses further improvement lies in: and a backflow prevention diode is arranged in the combiner box.
The utility model discloses further improvement lies in: the photovoltaic inverter comprises a support capacitor C +, a support capacitor C-and a T-shaped three-potential module and an LCL filter circuit;
the positive electrode of the support capacitor C + is connected with the positive electrode of the common direct current bus, the positive electrode of the support capacitor C-is connected with the negative electrode of the support capacitor C +, and the negative electrode of the support capacitor C-is connected with the negative electrode of the common direct current bus;
the input end of the T-shaped three-potential module is connected with a support capacitor C +, the support capacitor C-, and the output end of the T-shaped three-potential module is connected with a transformer through an LCL filter circuit.
The utility model discloses further improvement lies in: the T-shaped three-potential module consists of an A-phase circuit, a B-phase circuit and a C-phase circuit;
the A-phase circuit comprises a first A-phase switching tube Ta1A second A-phase switch tube Ta2And a third A-phase switch tube Ta3And a fourth A-phase switch tube Ta4The first A-phase switch tube Ta1The collector of the second A-phase switching tube T is connected with the anode of the common direct current busa2Collector and first A-phase switch tube Ta1The second A-phase switch tube Ta2The emitting electrode of the first A-phase switching tube T is connected with the negative electrode of the common direct current busa1And a second A-phase switch tube Ta2A phase A node is arranged between the four A phase switch tubes Ta4The collector of the fourth A-phase switch tube T is connected with the A-phase nodea4Emitter and third A-phase switch tube Ta3Is connected with the emitting electrode of the third A-phase switch tube Ta3The collector of the grid is connected with the point O;
the B-phase circuit comprises a first B-phase switching tube Tb1And a second B-phase switch tube Tb2And a third B-phase switch tube Tb3Fourth B-phase switch tube Tb4The first B-phase switch tube Tb1Collector and common direct currentThe positive electrodes of the buses are connected, and the second B-phase switch tube Tb2Collector and first B-phase switch tube Tb1The second B-phase switch tube Tb2The emitting electrode of the first phase B switching tube T is connected with the negative electrode of the common direct current busb1And a second B-phase switch tube Tb2A B-phase node is arranged between the four B-phase switching tubes Tb4The collector of the fourth B-phase switch tube T is connected with the B-phase nodeb4Emitter and third B-phase switch tube Tb3Is connected with the emitting electrode of the third B-phase switch tube Tb3The collector of the grid is connected with the point O;
the C-phase circuit comprises a first C-phase switch tube Tc1A second C-phase switch tube Tc2And a third C-phase switch tube Tc3And a fourth C-phase switch tube Tc4The first C-phase switch tube Tc1The collector of the second C-phase switching tube T is connected with the anode of the common direct current busc2Collector and first C-phase switch tube Tc1Is connected with the emitting electrode of the second C-phase switch tube Tc2The emitting electrode of the first C-phase switching tube T is connected with the negative electrode of the common direct current busc1And a second C-phase switch tube Tc2A C-phase node is arranged between the four C-phase switching tubes Tc4The collector of the fourth switch tube is connected with the C-phase node, and the fourth C-phase switch tube Tc4Emitter and third C-phase switch tube Tc3Is connected with the emitting electrode of the third C-phase switch tube Tc3Is connected to point O.
The utility model discloses further improvement lies in: the LCL filter circuit comprises a filter inductor LaFilter inductor LbFilter inductor LcFilter capacitor CaFilter capacitor CbAnd a filter capacitor Cc；
The A phase node passes through a filter inductor LaConnecting the phase A input end of the transformer;
b phase node passes through filter inductor LbConnecting the input end of the phase B of the transformer;
c phase node passes through filter inductor LcConnecting the input end of the phase C of the transformer;
filter circuitContainer CaFilter capacitor CbAnd a filter capacitor CcThe positive electrodes of the two-phase grid are respectively connected with an A-phase node, a B-phase node and a C-phase node; filter capacitor CaFilter capacitor CbAnd a filter capacitor CcAre connected in common.
The utility model discloses further improvement lies in: the energy storage device consists of a plurality of branches;
each branch circuit comprises a first switch tube, a second switch tube, a branch circuit inductor, a branch circuit capacitor and a storage battery; the collector of the first switch tube is connected with the anode of the confluence box, and the emitter of the second switch tube is connected with the cathode of the confluence box; the emitter of the first switch tube is connected with the collector of the second switch tube; the emitting electrode of the first switching tube is connected with the positive electrode of the storage battery through the branch inductor, and the negative electrode of the storage battery is connected with the negative electrode of the confluence box; the storage battery is connected with a branch capacitor in parallel.
The utility model discloses further improvement lies in: the energy storage device comprises at least two branches.
The utility model discloses further improvement lies in: the energy storage device adopts a direct series connection mode of storage batteries.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model relates to a photovoltaic power generation system, because of adding energy memory in direct current generating line department, play the steady fluctuation to photovoltaic power generation, store the unnecessary electric energy when generating efficiency is high in energy memory to discharge through energy memory when generating efficiency is low, with this fluctuation that reduces the generated energy, remain stable effect. The power quality of photovoltaic grid-connected power generation is improved, and the consumption capacity of a power grid to photovoltaic power generation is improved.
Further, the utility model relates to a photovoltaic inverter among photovoltaic power generation system adopts three level modules of T type, has improved switching frequency, has reduced the system volume.
Further, the utility model relates to a photovoltaic inverter among photovoltaic power generation system adopts LCL type filter circuit effectively to reduce the harmonic current component of pouring into in the electric wire netting electric current.
Further, the utility model relates to an energy memory adopts many branch circuits energy storage modular structure among photovoltaic power generation system, can adopt the direct series connection of battery to insert the form, avoids the parallelly connected circulation of battery.
Drawings
The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention. In the drawings:
fig. 1 is a block diagram of a photovoltaic power generation system according to the present invention;
fig. 2 is a circuit diagram of a photovoltaic power generation system of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
The following detailed description is exemplary in nature and is intended to provide further details of the invention. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention.
In order to make the technical means, creation features, achievement purposes and functions of the present invention understand and understand, the present invention is further explained below with reference to the accompanying drawings.
Referring to fig. 1 to 2, the present invention provides a photovoltaic power generation system, which includes a photovoltaic module, a combiner box, a photovoltaic inverter, a transformer and an energy storage device.
The photovoltaic module is connected with the combiner box, the combiner box is respectively connected with the photovoltaic inverter and the energy storage device through a public direct current bus, the photovoltaic inverter is connected with the transformer, and the transformer is connected with the power grid. The collection flow box is internally provided with a reverse flow prevention diode.
The photovoltaic inverter comprises a supportCapacitance C +, support capacitance C-, T-type three-potential module and filter inductance LaFilter inductor LbFilter inductor LcFilter capacitor CaFilter capacitor CbAnd a filter capacitor Cc. The anode of the support capacitor C + is connected with the anode of the common direct current bus, the anode of the support capacitor C-is connected with the cathode of the support capacitor C +, and the cathode of the support capacitor C-is connected with the cathode of the common direct current bus. Filter inductance LaFilter inductor LbFilter inductor LcFilter capacitor CaFilter capacitor CbAnd a filter capacitor CcForming an LCL filter circuit.
The T-type three-potential module consists of an A-phase circuit, a B-phase circuit and a C-phase circuit, wherein the A-phase circuit comprises a first A-phase switching tube Ta1A second A-phase switch tube Ta2And a third A-phase switch tube Ta3And a fourth A-phase switch tube Ta4First A-phase switch tube Ta1The collector of the first A-phase switching tube T is connected with the anode of a common direct current busa2Collector and first A-phase switch tube Ta1Is connected with the emitting electrode of the second A-phase switch tube Ta2The emitter of the first A-phase switch tube T is connected with the cathode of the common direct current busa1And a second A-phase switch tube Ta2A A phase node and a fourth A phase switch tube T are arranged betweena4The collector of the fourth A-phase switch tube T is connected with the A-phase nodea4Emitter and third A-phase switch tube Ta3Is connected with the emitting electrode of the third A-phase switch tube Ta3The collector of the grid is connected with the point O;
the B-phase circuit comprises a first B-phase switch tube Tb1And a second B-phase switch tube Tb2And a third B-phase switch tube Tb3Fourth B-phase switch tube Tb4First B-phase switch tube Tb1The collector of the second B-phase switch tube T is connected with the anode of the common direct current busb2Collector and first B-phase switch tube Tb1Is connected with the emitting electrode of the second B-phase switch tube Tb2The emitting electrode of the first B-phase switch tube T is connected with the negative electrode of the common direct current busb1And a second B-phase switch tube Tb2A B-phase node and a fourth B-phase switch tube T are arranged betweenb4Collector electrode ofA fourth B-phase switch tube T connected with the B-phase nodeb4Emitter and third B-phase switch tube Tb3Is connected with the emitting electrode of the third B-phase switch tube TbThe collector of 3 is connected with the point O;
the C-phase circuit comprises a first C-phase switch tube Tc1A second C-phase switch tube Tc2And a third C-phase switch tube Tc3And a fourth C-phase switch tube Tc4First C-phase switch tube Tc1The collector of the first C-phase switching tube T is connected with the anode of a common direct current busc2Collector and first C-phase switch tube Tc1Is connected with the emitting electrode of the second C-phase switch tube Tc2The emitter of the first C-phase switch tube T is connected with the cathode of the common direct current busc1And a second C-phase switch tube Tc2A C-phase node and a fourth C-phase switching tube T are arranged betweenc4The collector of the fourth C-phase switch tube T is connected with the C-phase nodec4Emitter and third C-phase switch tube Tc3Is connected with the emitting electrode of the third C-phase switch tube Tc3Is connected to point O.
The A phase node passes through a filter inductor LaConnecting the phase A input end of the transformer;
b phase node passes through filter inductor LbConnecting the input end of the phase B of the transformer;
c phase node passes through filter inductor LcConnecting the input end of the phase C of the transformer;
filter capacitor CaFilter capacitor CbAnd a filter capacitor CcThe positive electrodes of the two-phase grid are respectively connected with an A-phase node, a B-phase node and a C-phase node; filter capacitor CaFilter capacitor CbAnd a filter capacitor CcAre connected in common.
The energy storage device consists of a branch (1) and a branch (2), wherein the branch (1) comprises a bidirectional DC/DC module T11、T12Inductance L1Capacitor C1And a storage battery 1; the branch (2) comprises a DC/DC module T21、T22Inductance L2Capacitor C2And a secondary battery 2.
The energy storage device adopts a multi-branch energy storage module structure and adopts a mode of directly connecting storage batteries in series.
The energy storage device is formed by connecting two bridge arms in parallel, each bridge arm is formed by two switching tubes, and each bridge arm is connected with the storage battery through an inductor; the storage battery is connected with a capacitor in parallel.
Specifically, in the branch (1), a switch tube T11The collector of the switch tube T is connected with the anode of the support capacitor C + and the anode of the common direct current bus12The emitter of the second capacitor is connected with the cathode of the common direct current bus; switch tube T11The emitter is connected with a switch tube T12A collector electrode of (a); switch tube T11Through inductor L of emitter1The positive pole of the storage battery 1 is connected, and the negative pole of the storage battery 1 is connected with the negative pole of the common direct current bus; a capacitor C is connected in parallel on the storage battery 11. In the branch (2), a switch tube T21The collector of the capacitor C + is connected with the anode of the support capacitor C + and the anode of the common direct current bus, and the switch tube T22The emitter of the second capacitor is connected with the cathode of the common direct current bus; switch tube T21The emitter is connected with a switch tube T22A collector electrode of (a); switch tube T21Through inductor L of emitter2The positive pole of the storage battery 2 is connected, and the negative pole of the storage battery 2 is connected with the negative pole of the common direct current bus; a capacitor C is connected in parallel on the storage battery 22。
The utility model also provides a photovoltaic power generation method, a photovoltaic power generation system based on embodiment 1, including following step:
step one, outputting a direct current voltage U according to a photovoltaic modulepvCurrent IpvCalculating the MPPT optimum power point to obtain the current maximum power PMPPTAnd a command voltage UREFThe photovoltaic inverter is based on the command voltage UREFControlling the photovoltaic module to work at the maximum power point PMPPTThe voltage outer loop is used for maintaining the voltage on the DC side constant, and the output signal is used as the command current I of the current inner loopREFAnd the difference subtracted from the actually detected grid-connected current is sent to a current inner ring for control, and the dispatching instruction power P is transmitted to the power gridREF；
Step two, dispatching the instruction power PREFAnd photovoltaic power generation power PMPPTObtaining the energy storage output power PBAT＝PREF-PMPPTIf P isBATIf the voltage is more than 0, discharging the storage battery; if PBATLess than 0, charging the accumulator and using power f as energy storage deviceBATAnd performing constant power charge and discharge control, and preferentially distributing charge and discharge power of each branch.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of the invention or which are equivalent to the scope of the invention are embraced by the invention.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents of the embodiments of the invention may be made without departing from the spirit and scope of the invention, which should be construed as falling within the scope of the claims of the invention.
Claims (7)
1. A photovoltaic power generation system is characterized by comprising a photovoltaic assembly, a junction box, a photovoltaic inverter, a transformer and an energy storage device;
the photovoltaic assembly is connected with a combiner box, the combiner box is respectively connected with a photovoltaic inverter and an energy storage device through a public direct current bus, the photovoltaic inverter is connected with a transformer, and the transformer is connected with a power grid;
the photovoltaic inverter comprises a support capacitor C +, a support capacitor C-and a T-shaped three-potential module and an LCL filter circuit;
the positive electrode of the support capacitor C + is connected with the positive electrode of the common direct current bus, the positive electrode of the support capacitor C-is connected with the negative electrode of the support capacitor C +, and the negative electrode of the support capacitor C-is connected with the negative electrode of the common direct current bus;
the input end of the T-shaped three-potential module is connected with a support capacitor C +, the support capacitor C-, and the output end of the T-shaped three-potential module is connected with a transformer through an LCL filter circuit.
2. The photovoltaic power generation system of claim 1, wherein the combiner box has built-in anti-reflux diodes.
3. The photovoltaic power generation system according to claim 1, wherein the T-type three-potential module is composed of an a-phase circuit, a B-phase circuit, and a C-phase circuit;
the A-phase circuit comprises a first A-phase switching tube Ta1A second A-phase switch tube Ta2And a third A-phase switch tube Ta3And a fourth A-phase switch tube Ta4The first A-phase switch tube Ta1The collector of the second A-phase switching tube T is connected with the anode of the common direct current busa2Collector and first A-phase switch tube Ta1The second A-phase switch tube Ta2The emitting electrode of the first A-phase switching tube T is connected with the negative electrode of the common direct current busa1And a second A-phase switch tube Ta2A phase A node is arranged between the four A phase switch tubes Ta4The collector of the fourth A-phase switch tube T is connected with the A-phase nodea4Emitter and third A-phase switch tube Ta3Is connected with the emitting electrode of the third A-phase switch tube Ta3The collector of the grid is connected with the point O;
the B-phase circuit comprises a first B-phase switching tube Tb1And a second B-phase switch tube Tb2And a third B-phase switch tube Tb3Fourth B-phase switch tube Tb4The first B-phase switch tube Tb1The collector of the second phase B is connected with the anode of a common direct current bus, and the second phase B switch tube Tb2Collector and first B-phase switch tube Tb1The second B-phase switch tube Tb2The emitting electrode of the first phase B switching tube T is connected with the negative electrode of the common direct current busb1And a second B-phase switch tube Tb2A B-phase node is arranged between the four B-phase switching tubes Tb4The collector of the fourth B-phase switch tube T is connected with the B-phase nodeb4Emitter and third B-phase switch tube Tb3Of the emitterConnected, the third B-phase switch tube Tb3The collector of the grid is connected with the point O;
the C-phase circuit comprises a first C-phase switch tube Tc1A second C-phase switch tube Tc2And a third C-phase switch tube Tc3And a fourth C-phase switch tube Tc4The first C-phase switch tube Tc1The collector of the second C-phase switching tube T is connected with the anode of the common direct current busc2Collector and first C-phase switch tube Tc1Is connected with the emitting electrode of the second C-phase switch tube Tc2The emitting electrode of the first C-phase switching tube T is connected with the negative electrode of the common direct current busc1And a second C-phase switch tube Tc2A C-phase node is arranged between the four C-phase switching tubes Tc4The collector of the fourth switch tube is connected with the C-phase node, and the fourth C-phase switch tube Tc4Emitter and third C-phase switch tube Tc3Is connected with the emitting electrode of the third C-phase switch tube Tc3Is connected to point O.
4. The photovoltaic power generation system of claim 3, wherein the LCL filter circuit comprises a filter inductance LaFilter inductor LbFilter inductor LcFilter capacitor CaFilter capacitor CbAnd a filter capacitor Cc；
The A phase node passes through a filter inductor LaConnecting the phase A input end of the transformer;
b phase node passes through filter inductor LbConnecting the input end of the phase B of the transformer;
c phase node passes through filter inductor LcConnecting the input end of the phase C of the transformer;
filter capacitor CaFilter capacitor CbAnd a filter capacitor CcThe positive electrodes of the two-phase grid are respectively connected with an A-phase node, a B-phase node and a C-phase node; filter capacitor CaFilter capacitor CbAnd a filter capacitor CcAre connected in common.
5. The photovoltaic power generation system of claim 1, wherein the energy storage device is comprised of a plurality of branches;
each branch circuit comprises a first switch tube, a second switch tube, a branch circuit inductor, a branch circuit capacitor and a storage battery; the collector of the first switch tube is connected with the anode of the common direct current bus, and the emitter of the second switch tube is connected with the cathode of the common direct current bus; the emitter of the first switch tube is connected with the collector of the second switch tube; the emitting electrode of the first switching tube is connected with the positive electrode of the storage battery through the branch inductor, and the negative electrode of the storage battery is connected with the negative electrode of the common direct current bus; the storage battery is connected with a branch capacitor in parallel.
6. A photovoltaic power generation system according to claim 5, wherein the energy storage means comprises at least two branches.
7. A photovoltaic power generation system according to claim 5, wherein each branch comprises a plurality of series-connected storage cells.
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