CN215817552U - Wind-solar energy storage micro-grid system for transformer substation - Google Patents

Wind-solar energy storage micro-grid system for transformer substation Download PDF

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Publication number
CN215817552U
CN215817552U CN202121192031.3U CN202121192031U CN215817552U CN 215817552 U CN215817552 U CN 215817552U CN 202121192031 U CN202121192031 U CN 202121192031U CN 215817552 U CN215817552 U CN 215817552U
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power
wind
energy storage
grid
substation
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胡曦文
王椿丰
陈晋
王彬彬
苏嘉彬
陈斌
周冰
熊静
李海烽
胡继军
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China Energy Engineering Group Jiangsu Power Design Institute Co ltd
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China Energy Engineering Group Jiangsu Power Design Institute Co ltd
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Abstract

The utility model discloses a wind-solar energy storage micro-grid system for a substation, which comprises: the distributed power supply, the energy storage device, the control system and the related load power utilization system of the transformer substation; wherein the distributed power source comprises a wind power component for wind power generation and a photovoltaic component for photovoltaic power generation; the wind power assembly, the photovoltaic assembly and the energy storage device are respectively connected to a direct current bus so as to supply power to the direct current bus; the related load power utilization system of the transformer substation is connected into a direct current bus; the direct current bus is connected in series with a grid-connected switch and then is connected to a station power alternating current bus of a power grid; the control system is used for controlling and realizing the normal operation of the micro-grid. The utility model utilizes the distributed power supply to generate electricity, reduces the power consumption rate of the station, reduces the energy consumption of a large power grid, and solves the problems of energy shortage and overlarge station power consumption energy consumption at present.

Description

Wind-solar energy storage micro-grid system for transformer substation
Technical Field
The utility model belongs to the technical field of electrical engineering, and particularly relates to a wind-solar energy storage micro-grid system for a substation.
Background
The microgrid is a microgrid for short, and is a small-sized power generation and distribution system with small capacity and relatively simple structure. The general components comprise a distributed power supply, an energy storage device, an energy conversion device, a load, a monitoring and protecting device and the like. The micro-grid is a system for organically combining different types of distributed power supplies to supply power, so that the utilization rate of the distributed power supplies can be effectively improved; the system has a flexible operation mode, and can realize self control and protection; the advanced control strategy can be adopted to realize the coordinated control and gradient utilization of the distributed power supply, the stored energy and the demand side resource, thereby weakening the adverse effects of the randomness and the intermittence of the renewable energy sources such as wind energy, solar energy and the like on the safety and the stability of the power grid and the quality of the electric energy.
The substation power utilization system generally refers to a power supply and an auxiliary system thereof, which are responsible for power utilization of a cooling system of a transformer in a substation, power utilization of a switch and a disconnecting link switching-on/off power, power utilization of a secondary system (a protection, monitoring, communication and terminal box heater) in the substation and power supply of other power utilization facilities (such as lighting, ventilation, maintenance, air conditioning, access control and the like) in the substation, and is a key for ensuring safe and reliable operation of the substation.
The electricity utilization of a traditional transformer substation is generally realized through a low-voltage bus or other transformer substation transmission lines of the transformer substation through a step-down transformer, and the transformer substation consumes large electric energy of a power grid to meet load consumption in the transformer substation. The power utilization system of the transformer substation utilizing the renewable distributed power supply is researched, renewable energy can be fully utilized to generate power, the power consumption rate of the substation is reduced, the energy consumption of a large power grid is reduced, and the strategic target of building an energy internet in China is met. Therefore, research on a new energy collection system of a transformer substation is necessary.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art and provides a wind-solar energy storage micro-grid system for a substation, which utilizes a distributed power supply to generate electricity, reduces the power consumption rate of the substation and reduces the energy consumption of a large power grid.
In order to solve the technical problem, the utility model provides a wind-solar energy storage micro-grid system for a transformer substation, which comprises: the distributed power supply, the energy storage device, the control system and the related load power utilization system of the transformer substation;
wherein the distributed power source comprises a wind power component for wind power generation and a photovoltaic component for photovoltaic power generation;
the wind power assembly, the photovoltaic assembly and the energy storage device are respectively connected to a direct current bus so as to supply power to the direct current bus;
the related load power utilization system of the transformer substation is connected to the direct current bus so as to obtain a power supply from the direct current bus;
the direct current bus is connected in series with a grid-connected switch and then is connected to a station power alternating current bus of a power grid;
the control system is connected with the direct current bus, the distributed power supply and the energy storage device to control and realize normal operation of the micro-grid.
Optionally, the power utilization system of the related load of the transformer substation includes a direct current load and an alternating current load.
Optionally, the dc load is directly connected to the dc bus, and the ac load is connected to the dc bus through the inverter device.
Optionally, the photovoltaic module is arranged on the roof of the substation power distribution device building and the top of the substation enclosure wall.
Optionally, the wind power assembly is arranged on the roof of a transformer substation guard room, a fire pump room and a deluge valve room house.
Optionally, the energy storage device is configured with power and capacity, and should satisfy the following conditions:
C cell ≥(P source-P load)*T max
P cellP source
in the formula (I), the compound is shown in the specification,C cell the maximum capacity of the energy storage device is,P cellthe maximum charging power for the energy storage device,P sourcethe maximum power generation of renewable energy sources comprises the sum of the maximum power generation of wind power generation and photovoltaic power generation,P loadfor the use of AC/DC load power in daily stations,T maxthe maximum power generation time of the new energy is long.
Compared with the prior art, the utility model has the following beneficial effects:
(1) the method makes up the resource defects of wind power and photoelectric independent systems, and effectively utilizes the complementarity of solar energy and wind energy in the time dimension: day and night complementation is realized, so that solar energy is sufficient in the day, and wind energy is sufficient at night; the seasons are complementary, the wind energy is sufficient in spring and winter, and the solar energy is sufficient in summer and autumn.
(2) The space of the roof, the high altitude and the ground of the transformer substation is reasonably utilized, the space resources are integrated to the maximum extent, and the complementarity of wind energy and solar energy on the space dimension is utilized.
(3) The energy storage device is used as a central link of the wind power system and the photoelectric system, so that the wind power system and the photoelectric system can be effectively connected, and the stability of load power supply is guaranteed.
(4) The wind power and photoelectric system can be used universally in the energy storage device, the inverter device and the control system, so the manufacturing cost of the wind power and photoelectric complementary power generation system can be reduced, the system cost tends to be reasonable, and the cost performance is high.
(5) The modules of the system are reasonably planned and designed on the basis of load prediction, so that balance of supply and demand of the micro-grid can be realized, little or no power supply is needed at the side of the micro-grid, and better social benefit and economic benefit can be obtained.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which:
FIG. 1 is an electrical wiring schematic diagram of a wind-solar energy storage micro-grid system design scheme for a substation;
fig. 2 is a specific embodiment of a design scheme of a wind-solar energy storage micro-grid system for a substation.
Detailed Description
The utility model is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
In the description of the present patent application, it is noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, including not only those elements listed, but also other elements not expressly listed.
In the description of the present patent application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present patent can be understood in a specific case by those skilled in the art.
The wind-solar energy storage micro-grid system fused with the power utilization system of the transformer substation is innovatively provided by combining with the general design scheme of the power transmission and transformation project of the national power grid, so that the aims of connecting the power utilization system of the substation to the power utilization system of the substation, saving power consumption energy consumption of the substation, reducing carbon emission of the power utilization of the substation and building a green transformer substation are fulfilled on the premise of not changing the arrangement of any general design scheme. The problem of the coupling of the existing microgrid technology and the substation power utilization system is solved, the problems of high power utilization resource consumption and high environmental cost of the substation are solved, and the domestic blank in the field is filled.
The utility model relates to a wind-solar energy storage micro-grid system for a substation, which specifically relates to the following processes:
(1) understanding main technical conditions of design scheme of transformer substation
The main technical conditions of the transformer substation comprise: the construction scale, the main electrical wiring, the type selection of main equipment, the electrical general plane, the power distribution device and the civil engineering part. The new energy microgrid for the design station mainly focuses on arrangement of an electric total leveling and power distribution device, occupied area in a wall in a civil engineering part and total building area (roof area) of the total station so as to arrange a photovoltaic module for photovoltaic power generation and a fan module for fan power generation.
(2) AC/DC frequent load statistics for transformer substation
(3) Photovoltaic module arrangement scheme
The photovoltaic module is arranged on the roof of a power distribution device building of a transformer substation and the top of a surrounding wall of the transformer substation. And after the direct current generated by the photovoltaic module is inverted into alternating current by the group of series inverters, the alternating current is connected to the power supply side of the power utilization system of the station in the station.
(4) Fan assembly arrangement scheme
Due to the space problem in the transformer substation, the transformer substation is not suitable for arranging large fans, and therefore small fan assemblies are selected. Wind power generators with a power of 10 kw or less are generally called small fans.
The small-sized fan unit generally comprises the following parts: the system comprises a wind wheel, a generator, a speed and direction regulating mechanism, a parking mechanism, a tower, a guy cable and the like, a controller, a storage battery, an inverter and the like.
Considering that the areas of roofs of a transformer substation guard room, a fire pump room and a deluge valve room are small and are not suitable for arranging photovoltaic modules, the small-sized fan is selected to be arranged on the roofs of small-area houses such as the transformer substation guard room, the fire pump room and the deluge valve room.
(5) Energy storage device configuration principle
The energy storage device should combine the technical condition of transformer substation, according to exchanging, direct current frequent load statistics and typical wind-powered electricity generation, photovoltaic output, reasonable calculation configuration power and capacity should satisfy following condition:
C cell ≥(P source-P load)*T max
P cellP source
in the formula (I), the compound is shown in the specification,C cell the maximum capacity of the energy storage device is,P cellthe maximum charging power for the energy storage device,P sourcethe maximum power generation of renewable energy sources comprises the sum of the maximum power generation of wind power generation and photovoltaic power generation,P loadfor the use of AC/DC load power in daily stations,T maxthe maximum power generation time of the new energy is long.
(6) New forms of energy access station power consumption system
After the wind-light combined distributed power supply and the energy storage device are planned to be arranged in a plane, a wind-light micro-storage system formed by the distributed power supply and the energy storage device and a micro-grid system formed by station variable important loads are connected to a station power utilization alternating current bus through a grid-connected switch, a direct current bus wiring structure adopting a micro-grid is determined, direct current loads are directly supplied with power through the direct current bus, the alternating current loads are connected with the direct current bus through an inverter device and the like, and the direct current bus connects the micro-grid system to the station power utilization alternating current bus through DC/AC conversion.
Through the above design process, the wind-solar energy storage micro-grid system for the substation, shown in fig. 1, includes: the distributed power supply, the energy storage device, the control system and the related load power utilization system of the transformer substation;
wherein the distributed power source comprises a wind power component for wind power generation and a photovoltaic component for photovoltaic power generation;
the wind power assembly, the photovoltaic assembly and the energy storage device are respectively connected to a direct current bus so as to supply power to the direct current bus;
the related load power utilization system of the transformer substation is connected to the direct current bus so as to obtain a power supply from the direct current bus;
the direct current bus is connected in series with a grid-connected switch and then is connected to a station power alternating current bus of a power grid;
the control system is connected with the direct current bus, the distributed power supply and the energy storage device to control and realize normal operation of the micro-grid.
The substation microgrid of the utility model generally refers to a small-sized power distribution and utilization system composed of a distributed power supply, an energy storage device, a control system and related loads of a transformer substation. The distributed power supply generally adopts a mode of combining wind power generation and photovoltaic power generation, and the formed microgrid is also called a wind-solar complementary microgrid system. This system has the following advantages:
(1) the method makes up the resource defects of wind power and photoelectric independent systems, and effectively utilizes the complementarity of solar energy and wind energy in the time dimension: day and night complementation is realized, so that solar energy is sufficient in the day, and wind energy is sufficient at night; the seasons are complementary, the wind energy is sufficient in spring and winter, and the solar energy is sufficient in summer and autumn.
(2) The space of the roof, the high altitude and the ground of the transformer substation is reasonably utilized, the space resources are integrated to the maximum extent, and the complementarity of wind energy and solar energy on the space dimension is utilized.
(3) The energy storage device is used as a central link of the wind power system and the photoelectric system, so that the wind power system and the photoelectric system can be effectively connected, and the stability of load power supply is guaranteed.
(4) The wind power and photoelectric system can be used universally in the energy storage device, the inverter device and the control system, so the manufacturing cost of the wind power and photoelectric complementary power generation system can be reduced, the system cost tends to be reasonable, and the cost performance is high.
(5) The modules of the system are reasonably planned and designed on the basis of load prediction, so that balance of supply and demand of the micro-grid can be realized, little or no power supply is needed at the side of the micro-grid, and better social benefit and economic benefit can be obtained.
Examples
Taking the general design 220-A3-2 scheme as an example, the power distribution unit is arranged indoors except for the main transformer, and the occupied area in the enclosure is 0.714hm2Total station area 3775m2The photovoltaic assembly is arranged on the roofs of the two power distribution device buildings, and the fan assembly is arranged on the diagonal angle between the fire pump room and the guard room roof.
The scheme is characterized in that 378 blocks of 540Wp photovoltaic assemblies are arranged, and the capacity is 204kW in total; the enclosure is provided with 83 photovoltaic modules with the capacity of 44 kW; 295 photovoltaic modules with the capacity of 160kW are arranged on the roof; the four 2kW fan assemblies are arranged, and the total capacity is 8 kW.
According to statistics, the daily power consumption of the continuous and frequent alternating current and direct current load of the transformer substation in the scheme is about 153kW (illumination is not considered in the daytime), 164-193 kW (guard room and outdoor illumination are considered to be normally bright at night, and other illumination is possibly normally bright), the maximum energy consumption of the fixed used electricity of the transformer substation per day is 4632kWh when the power supply is calculated for 24 hours, and the total energy consumption of the transformer substation per day is 5745 kWh.
According to the installed capacity of new energy, 204kW photovoltaic power generation and 8kW wind power generation need to be consumed by energy storage, the energy storage power needs to be more than 212kW, and therefore the PCS configuration is considered according to 250 kW. In accordance with a typical summer photovoltaic output curve, considering the average load of the conventional equipment in terms of 150kW, the renewable energy power generation required to be absorbed by a typical summer solar energy storage power plant as shown in FIG. 2 is approximately 600 kWh. For this purpose, the power/capacity configuration of the energy storage system is proposed to be 250kW/600 kWh.
After the wind-light combined distributed power supply and the energy storage device are planned to be arranged in a plane, a micro-grid system consisting of a wind-light micro-storage system and a station variable important load is connected to a station power utilization alternating current bus through a grid-connected switch, a direct current bus wiring structure adopting a micro-grid is determined, direct current loads are directly supplied with power through the direct current bus, the alternating current loads are connected with the direct current bus through an inverter device and the like, and the direct current bus connects the micro-grid system to the station power utilization alternating current bus through DC/AC conversion.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (6)

1. A wind-solar energy storage micro-grid system for a substation is characterized by comprising: the distributed power supply, the energy storage device, the control system and the related load power utilization system of the transformer substation;
wherein the distributed power source comprises a wind power component for wind power generation and a photovoltaic component for photovoltaic power generation;
the wind power assembly, the photovoltaic assembly and the energy storage device are respectively connected to a direct current bus so as to supply power to the direct current bus;
the related load power utilization system of the transformer substation is connected to the direct current bus so as to obtain a power supply from the direct current bus;
the direct current bus is connected in series with a grid-connected switch and then is connected to a station power alternating current bus of a power grid;
the control system is connected with the direct current bus, the distributed power supply and the energy storage device to control and realize normal operation of the micro-grid.
2. The wind-solar energy storage micro-grid system for the substation as claimed in claim 1, wherein the load power utilization system related to the substation comprises a direct current load and an alternating current load.
3. The wind-solar energy storage micro-grid system for the substation as claimed in claim 2, wherein the dc loads are directly connected to the dc bus, and the ac loads are connected to the dc bus through an inverter device.
4. The wind-solar energy storage micro-grid system for the substation as claimed in claim 1, wherein the photovoltaic module is arranged on the roof of the substation power distribution device building and on the top of the substation enclosure wall.
5. The wind-solar energy storage microgrid system for a substation station according to claim 1, wherein the wind power assembly is arranged on the roof of a substation guard room, a fire pump room and a deluge valve room house.
6. The wind-solar energy storage micro-grid system for the substation as claimed in claim 1, wherein the energy storage device is configured with power and capacity, and the following conditions should be satisfied:
C cell ≥(P source-P load)*T max
P cellP source
in the formula (I), the compound is shown in the specification,C cell the maximum capacity of the energy storage device is,P cellthe maximum charging power for the energy storage device,P sourcethe maximum power generation of renewable energy sources comprises the sum of the maximum power generation of wind power generation and photovoltaic power generation,P loadfor the use of AC/DC load power in daily stations,T maxthe maximum power generation time of the new energy is long.
CN202121192031.3U 2021-05-31 2021-05-31 Wind-solar energy storage micro-grid system for transformer substation Active CN215817552U (en)

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CN202121192031.3U CN215817552U (en) 2021-05-31 2021-05-31 Wind-solar energy storage micro-grid system for transformer substation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202121192031.3U CN215817552U (en) 2021-05-31 2021-05-31 Wind-solar energy storage micro-grid system for transformer substation

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Publication Number Publication Date
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