CN110912195A - Wind-solar hybrid power generation system - Google Patents
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- CN110912195A CN110912195A CN201911266521.0A CN201911266521A CN110912195A CN 110912195 A CN110912195 A CN 110912195A CN 201911266521 A CN201911266521 A CN 201911266521A CN 110912195 A CN110912195 A CN 110912195A
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
According to the wind-solar hybrid power generation system, the output end of the wind power branch and the output end of the photovoltaic branch are connected with a power grid through the transformer; and the influence of PID effect on the photovoltaic modules in the photovoltaic branches is eliminated through virtual grounding, and meanwhile, at least one isolating device exists in a circuit between a photovoltaic array in the photovoltaic branches and a fan in a wind power branch, so that the condition that the virtual grounding cannot cause insulating pressure on the fan is ensured, and the safe and reliable operation of the wind-solar hybrid power generation system is further ensured.
Description
Technical Field
The invention relates to the technical field of power generation systems, in particular to a wind-solar hybrid power generation system.
Background
In recent years, with a drastic decrease in cost of clean energy represented by wind, light, and the like, it has been vigorously developed on a global scale; in addition, in a short period, the fan has larger output at night or in cloudy days, the photovoltaic has larger output in the daytime when the illumination is better, and in seasons, the fan has larger output in autumn and winter and the photovoltaic has larger output in summer; in addition, from the aspect of project site selection, an area which is hundreds of meters around the fan is not suitable for other production activities due to noise, safety protection and the like, and the waste of the land in the area can be reasonably utilized when photovoltaic power generation is carried out in the area; therefore, wind and light complementary projects are gradually popularized and used in recent years based on the fact that wind and light energy sources have great complementarity in time scale and place selection.
Fig. 1 shows a wind-solar hybrid scheme in conventional use, in which a photovoltaic system and a wind power system are coupled only on the grid side. It can be seen that a large number of converters are essentially the same in the loops of the wind power converter (including the AC/DC converter, the energy storage device and the DC/AC converter) and the photovoltaic converter (including the DC/DC converter, the energy storage device and the DC/AC converter), so that the multiplexing can be performed to a certain extent; based on this, the prior art has produced the scheme shown in fig. 2, in which the electric energy output by the fan through the wind power rectifier (including the AC/DC converter) and the electric energy output by the photovoltaic through the photovoltaic MPPT module (including the BOOST circuit) are both imported into the energy storage device of the DC bus; also, the scheme reuses the energy storage device, the DC/AC converter and the grid-connected transformer, and saves the setting and maintenance cost of the system.
However, in the scheme shown in fig. 2, most of devices of the wind-solar two-energy grid-connected branch are shared, so if the conventional scheme is used in the scheme to perform PID effect prevention processing on the photovoltaic module through virtual grounding, insulation pressure will be caused on the wind power system.
Disclosure of Invention
The invention provides a wind-solar hybrid power generation system, which aims to solve the problem that in the prior art, the insulation pressure of a wind power system is caused by PID (proportion integration differentiation) effect prevention.
In order to achieve the purpose, the technical scheme provided by the application is as follows:
the invention provides a wind-solar hybrid power generation system, which comprises: the system comprises a wind power branch, a photovoltaic branch and a transformer; wherein:
the output end of the wind power branch and the output end of the photovoltaic branch are both connected with a power grid through the transformer;
the wind-solar hybrid power generation system eliminates the influence of PID effect on the photovoltaic modules in the photovoltaic branches through virtual grounding;
at least one isolating device exists in a circuit between a photovoltaic array in the photovoltaic branch and a fan in the wind power branch.
Preferably, the transformer is a double-split transformer;
the wind power branch circuit comprises: a fan and a wind power converter; the fan is connected with the input end of the wind power converter, and the output end of the wind power converter is used as the output end of the wind power branch;
the photovoltaic branch includes: a photovoltaic array and a photovoltaic converter; the output end of the photovoltaic array is connected with the direct current side of the photovoltaic converter, and the alternating current side of the photovoltaic converter is used as the output end of the photovoltaic branch.
Preferably, the method further comprises the following steps: a current transformer;
the direct current side of the converter is respectively connected with the output end of the wind power branch and the output end of the photovoltaic branch;
and the alternating current side of the converter is connected with a power grid through the transformer.
Preferably, the wind power branch comprises: a fan and a wind power rectifier; the fan is connected with the alternating current side of the wind power rectifier, and the direct current side of the wind power rectifier is used as the output end of the wind power branch;
the photovoltaic branch includes: the photovoltaic array and at least one photovoltaic MPPT module; the photovoltaic group string in the photovoltaic array is connected with the input end corresponding to the photovoltaic MPPT module, and the output end of the photovoltaic MPPT module is used as one output end of the photovoltaic branch;
the photovoltaic MPPT module comprises an isolated DC/DC conversion circuit.
Preferably, the wind power branch comprises: a fan and a wind power rectifier; the fan is connected with the alternating current side of the wind power rectifier, and the direct current side of the wind power rectifier is used as the output end of the wind power branch;
the photovoltaic branch includes: a photovoltaic array; the photovoltaic array comprises at least one photovoltaic string, and the output end of the photovoltaic string is used as one output end of the photovoltaic branch;
the wind power rectifier comprises an isolated AC/DC conversion circuit.
Preferably, the photovoltaic branch further includes: at least one photovoltaic MPPT module; the photovoltaic group string is connected with the input end corresponding to the photovoltaic MPPT module, and the output end of the photovoltaic MPPT module is used as an output end of the photovoltaic branch.
Preferably, the negative electrode of the photovoltaic string of the photovoltaic array in the photovoltaic branch is directly grounded, or grounded through impedance, so as to implement virtual grounding of the wind-solar hybrid power generation system.
Preferably, the impedance is: at least one of a resistor, an inductor, and a fuse.
Preferably, the neutral point of the transformer receives a preset voltage to realize virtual grounding of the wind-solar hybrid power generation system.
Preferably, the wind-solar hybrid power generation system adopts centralized control or master-slave control.
Preferably, the method further comprises the following steps: an electrochemical energy storage branch and/or a biomass power generation branch;
the electrochemical energy storage branch and the biomass power generation branch are arranged at a grid-connected point coupling position of the wind-solar hybrid power generation system; alternatively, the first and second electrodes may be,
when the wind-solar hybrid power generation system comprises a converter, the electrochemical energy storage branch and the biomass power generation branch are arranged on the direct current side of the converter.
According to the wind-solar hybrid power generation system, the output end of the wind power branch and the output end of the photovoltaic branch are connected with a power grid through the transformer; and the influence of PID effect on the photovoltaic modules in the photovoltaic branches is eliminated through virtual grounding, and meanwhile, at least one isolating device exists in a circuit between a photovoltaic array in the photovoltaic branches and a fan in a wind power branch, so that the condition that the virtual grounding cannot cause insulating pressure on the fan is ensured, and the safe and reliable operation of the wind-solar hybrid power generation system is further ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a wind-solar hybrid power generation system provided by the prior art;
FIG. 2 is a schematic structural diagram of another wind-solar hybrid power generation system provided by the prior art;
FIG. 3 is a schematic structural diagram of a wind-solar hybrid power generation system provided by an embodiment of the application;
FIG. 4 is a schematic view of another structure of a wind-solar hybrid power generation system provided by an embodiment of the present invention;
FIG. 5 is a schematic view of another structure of a wind-solar hybrid power generation system provided by an embodiment of the present invention;
FIG. 6 is a schematic view of another structure of a wind-solar hybrid power generation system provided by an embodiment of the present invention;
FIG. 7 is a schematic view of another structure of a wind-solar hybrid power generation system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The invention provides a wind-solar hybrid power generation system, which aims to solve the problem that in the prior art, the insulation pressure of a wind power system is caused by PID (proportion integration differentiation) effect prevention.
Specifically, referring to fig. 3, the wind-solar hybrid power generation system includes: a wind power branch 100, a photovoltaic branch 200 and a transformer 400; wherein: the output end of the wind power branch 100 and the output end of the photovoltaic branch 200 are both connected to the power grid through a transformer 400.
Alternatively, referring to fig. 4 and 5, the wind-solar hybrid power generation system includes: the system comprises a wind power branch 100, a photovoltaic branch 200, a converter 300 and a transformer 400; wherein: the output end of the wind power branch 100 and the output end of the photovoltaic branch 200 are both connected with the direct current side of the converter 300; the ac side of the converter 300 is connected to the grid through a transformer 400.
In any structure, the wind-solar hybrid power generation system eliminates the influence of the PID effect on the photovoltaic components in the photovoltaic branch 200 through virtual grounding; in addition, at least one isolation device is arranged in a circuit between the photovoltaic array in the photovoltaic branch circuit 200 and the fan in the wind power branch circuit 100, so that the virtual grounding cannot cause insulation pressure on the fan.
As shown in fig. 3, the transformer 400 is a double-split transformer, and the wind turbine power generation and the photovoltaic power generation are multiplexed only at the grid-connected transformer side end, so as to ensure the isolation between the two, and avoid insulation pressure on the wind turbine power generation caused by eliminating PID influence. At this time, the wind power branch 100 includes: a wind turbine (shown as M in fig. 3) and a wind power converter; the fan is connected with the input end of the wind power converter, and the output end of the wind power converter is used as the output end of the wind power branch. Its photovoltaic branch 200 includes: a photovoltaic array and a photovoltaic converter; the output end of the photovoltaic array is connected with the direct current side of the photovoltaic converter, and the alternating current side of the photovoltaic converter is used as the output end of the photovoltaic branch. Wherein, fan converter includes: the energy storage device comprises an AC/DC conversion circuit, an energy storage device and a DC/AC conversion circuit which are connected in sequence, wherein the AC side of the AC/DC conversion circuit is used as the input end of the fan converter, the AC side of the DC/AC conversion circuit is used as the output end of the fan converter, and the energy storage device is connected between the AC/DC conversion circuit and the DC side of the DC/AC conversion circuit. Photovoltaic converter includes at least: the energy storage device is connected to the direct current side of the DC/AC conversion circuit, and the alternating current side of the DC/AC conversion circuit is used as the output end of the photovoltaic converter; in practical application, the DC side of the photovoltaic converter may further be provided with a DC/DC conversion circuit, which is not specifically limited herein and is determined according to the application environment, and all of which are within the protection scope of the present application.
As shown in fig. 4, the wind power branch 100 includes: a wind turbine (M as shown in fig. 4) and a wind rectifier; the fan is connected with the alternating current side of the wind power rectifier, and the direct current side of the wind power rectifier is used as the output end of the wind power branch. Its photovoltaic branch 200 includes: the photovoltaic array and at least one photovoltaic MPPT module; photovoltaic group string in the photovoltaic array links to each other with the input that corresponds photovoltaic MPPT module, and photovoltaic MPPT module's output is as an output of photovoltaic branch road. Moreover, the wind power rectifier comprises a common AC/DC conversion circuit (as shown in fig. 4) or an isolated AC/DC conversion circuit (not shown), and the photovoltaic MPPT module comprises an isolated DC/DC conversion circuit to ensure the isolation between the wind turbine power generation and the photovoltaic power generation; therefore, the output of the photovoltaic array is connected with the output of the fan rectifier through an isolated DC/DC conversion circuit, and is connected to the energy storage device at the DC bus of the converter 300, so as to multiplex all the converters at the rear stage. At the moment, the virtual grounding processing is executed on the side, close to the photovoltaic module, of the isolated DC/DC conversion circuit so as to solve the influence caused by the PID problem, and pressure cannot be caused on side insulation of the wind turbine.
As shown in fig. 5, the wind power branch 100 and the photovoltaic branch 200 have the same structures as those of fig. 4, except that the photovoltaic MPPT module is optional, that is, may exist or does not exist, and when the photovoltaic MPPT module exists, the wind power branch and the photovoltaic branch may specifically include a common DC/DC conversion circuit (as shown in fig. 5) or an isolated DC/DC conversion circuit (not shown); the wind power rectifier comprises an isolation type AC/DC conversion circuit to ensure the isolation between the power generation of the fan and the photovoltaic power generation, and further avoid the insulation pressure on the power generation of the fan caused by eliminating the PID influence.
As shown in fig. 4 and 5, in this case, the main circuit of the current transformer 300 includes: an energy storage device and a DC/AC conversion circuit. As shown in fig. 3, the energy storage device is connected to the DC side of the DC/AC converter, and the connection point is the DC side of the converter 300; the AC side of the DC/AC conversion circuit is the AC side of the converter 300. The energy storage device is a bus capacitor, and the specific implementation form of the energy storage device is the same as that of the prior art.
The wind-solar hybrid power generation systems shown in fig. 3 to fig. 7 all eliminate the influence of the PID effect on the photovoltaic components in the photovoltaic branch 200 through the virtual ground; the implementation scheme of the virtual ground of the wind-solar hybrid power generation system may specifically include the following ways:
as shown in fig. 3 to 5, the grounding is directly performed by the negative electrode of the photovoltaic string of the photovoltaic array in the photovoltaic branch 200, or may be performed by grounding the negative electrode of the photovoltaic string of the photovoltaic array in the photovoltaic branch 200 through impedance; the impedance of the negative electrode of the photovoltaic string for grounding may be: at least one of a resistor, an inductor, and a fuse, such as a combination of one or more of them, or a combination of two or more of them, which is not specifically limited herein.
Alternatively, for the two wind-solar hybrid power generation systems shown in fig. 3 and 5, the neutral point of the transformer 400 may receive the preset voltage V0, instead of the scheme of grounding the negative electrode of the photovoltaic string of the photovoltaic array directly/through impedance, so as to implement the virtual grounding; fig. 6 is another virtual ground scheme in the same structure as fig. 3, and fig. 7 is another virtual ground scheme in the same structure as fig. 5. Moreover, the value of the preset voltage V0 may also be determined according to the specific application environment, and the preset voltage V0 may be provided by a corresponding voltage source, which is not specifically limited herein; any solution capable of implementing a virtual ground function in the prior art is within the scope of the present application.
No matter what kind of mode is adopted to realize the virtual grounding of the wind-solar hybrid power generation system, at least one isolating device exists in a circuit between the photovoltaic array and the fan, so that the virtual grounding can not cause insulating pressure on the fan, and the safe and reliable operation of the wind-solar hybrid power generation system is further ensured.
On the basis of the above embodiments, it should be noted that the wind-solar hybrid power generation system may adopt centralized control or master-slave control, which is not specifically limited herein and is determined according to the application environment, and is within the protection scope of the present application.
For the wind-solar hybrid power generation system shown in fig. 3, the wind power converter is provided with a corresponding wind power controller, and the photovoltaic converter is provided with a corresponding photovoltaic controller. When the wind-solar hybrid power generation system is controlled in a centralized mode, the wind-solar hybrid power generation system is further provided with an independent system controller, and the system controller is communicated with the wind power controller and the photovoltaic controller, so that the working states of the main circuit in the wind power converter and the main circuit in the photovoltaic converter are controlled. When the wind-solar hybrid power generation system adopts master-slave control, any one of the wind power controller and the photovoltaic controller, such as the wind power controller, is used as a communication host and is responsible for controlling the working states of the wind power converter and the main circuit in the photovoltaic converter.
For the wind-solar hybrid power generation system with the photovoltaic MPPT module shown in fig. 4 and 5, the wind power rectifier is provided with a corresponding rectification controller, and the converter is provided with a corresponding conversion controller. When the wind-solar hybrid power generation system adopts centralized control, the wind-solar hybrid power generation system is also provided with an independent system controller, and the system controller is communicated with the rectification controller and the current transformation controller so as to realize the control of the working states of the wind power rectifier and the main circuit in the current transformer. When the wind-solar hybrid power generation system adopts master-slave control, any one of the rectification controller and the current transformation controller, such as the current transformation controller, is used as a communication host and is responsible for controlling the working states of the wind power rectifier and the main circuit in the converter. Moreover, no matter the wind-solar hybrid power generation system adopts centralized control or master-slave control, the working state of each photovoltaic MPPT module can be directly controlled by a system controller/communication host, can be respectively controlled by an additionally arranged controller through communication with the system controller/communication host, and can be correspondingly controlled by an internal controller equipped by the wind-solar hybrid power generation system through communication with the system controller/communication host one by one; all of them are not specifically limited, and all of them are within the protection scope of the present application, depending on the specific application environment.
In addition, the wind-solar hybrid power generation system described in the above embodiment can also add other types of energy branches on the basis of two wind-power energy branches to form a multi-energy hybrid power generation system; for example, an electrochemical energy storage branch and/or a biomass power generation branch may be added to the dc side of the converter 300 shown in fig. 4 and 5 or the point-to-point coupling of the wind-solar hybrid power generation system shown in fig. 3 to 5; the scheme that the photovoltaic PID effect can be solved, the reliability of the system is improved, and the long-term power generation capacity is improved on the basis of less converter series, high system efficiency and low system cost is within the protection range of the application.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are merely illustrative, wherein units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (11)
1. A wind-solar hybrid power generation system, comprising: the system comprises a wind power branch, a photovoltaic branch and a transformer; wherein:
the output end of the wind power branch and the output end of the photovoltaic branch are both connected with a power grid through the transformer;
the wind-solar hybrid power generation system eliminates the influence of PID effect on the photovoltaic modules in the photovoltaic branches through virtual grounding;
at least one isolating device exists in a circuit between a photovoltaic array in the photovoltaic branch and a fan in the wind power branch.
2. The wind-solar hybrid power generation system of claim 1, wherein the transformer is a double split transformer;
the wind power branch circuit comprises: a fan and a wind power converter; the fan is connected with the input end of the wind power converter, and the output end of the wind power converter is used as the output end of the wind power branch;
the photovoltaic branch includes: a photovoltaic array and a photovoltaic converter; the output end of the photovoltaic array is connected with the direct current side of the photovoltaic converter, and the alternating current side of the photovoltaic converter is used as the output end of the photovoltaic branch.
3. The wind-solar hybrid power generation system according to claim 1, further comprising: a current transformer;
the direct current side of the converter is respectively connected with the output end of the wind power branch and the output end of the photovoltaic branch;
and the alternating current side of the converter is connected with a power grid through the transformer.
4. The wind-solar hybrid power generation system of claim 3, wherein the wind power branch comprises: a fan and a wind power rectifier; the fan is connected with the alternating current side of the wind power rectifier, and the direct current side of the wind power rectifier is used as the output end of the wind power branch;
the photovoltaic branch includes: the photovoltaic array and at least one photovoltaic MPPT module; the photovoltaic group string in the photovoltaic array is connected with the input end corresponding to the photovoltaic MPPT module, and the output end of the photovoltaic MPPT module is used as one output end of the photovoltaic branch;
the photovoltaic MPPT module comprises an isolated DC/DC conversion circuit.
5. The wind-solar hybrid power generation system of claim 3, wherein the wind power branch comprises: a fan and a wind power rectifier; the fan is connected with the alternating current side of the wind power rectifier, and the direct current side of the wind power rectifier is used as the output end of the wind power branch;
the photovoltaic branch includes: a photovoltaic array; the photovoltaic array comprises at least one photovoltaic string, and the output end of the photovoltaic string is used as one output end of the photovoltaic branch;
the wind power rectifier comprises an isolated AC/DC conversion circuit.
6. The wind-solar hybrid power generation system of claim 5, wherein the photovoltaic branch further comprises: at least one photovoltaic MPPT module; the photovoltaic group string is connected with the input end corresponding to the photovoltaic MPPT module, and the output end of the photovoltaic MPPT module is used as an output end of the photovoltaic branch.
7. The wind-solar hybrid power generation system according to any one of claims 1 to 6, wherein the negative pole of the photovoltaic string of the photovoltaic array in the photovoltaic branch is directly grounded or grounded through impedance to realize virtual grounding of the wind-solar hybrid power generation system.
8. The wind-solar hybrid power generation system of claim 7, wherein the impedance is: at least one of a resistor, an inductor, and a fuse.
9. The wind-solar hybrid power generation system according to any one of claims 2, 3, 5 and 6, wherein the neutral point of the transformer receives a preset voltage to realize virtual grounding of the wind-solar hybrid power generation system.
10. The wind-solar hybrid power generation system according to any one of claims 1 to 6, wherein the wind-solar hybrid power generation system adopts centralized control or master-slave control.
11. The complementary wind-solar power generation system according to any one of claims 1 to 6, further comprising: an electrochemical energy storage branch and/or a biomass power generation branch;
the electrochemical energy storage branch and the biomass power generation branch are arranged at a grid-connected point coupling position of the wind-solar hybrid power generation system; alternatively, the first and second electrodes may be,
when the wind-solar hybrid power generation system comprises a converter, the electrochemical energy storage branch and the biomass power generation branch are arranged on the direct current side of the converter.
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