CN219739974U - Photovoltaic energy storage grid-connected operation system - Google Patents
Photovoltaic energy storage grid-connected operation system Download PDFInfo
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- CN219739974U CN219739974U CN202320017527.XU CN202320017527U CN219739974U CN 219739974 U CN219739974 U CN 219739974U CN 202320017527 U CN202320017527 U CN 202320017527U CN 219739974 U CN219739974 U CN 219739974U
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Abstract
The utility model discloses a photovoltaic energy storage grid-connected operation system, which comprises a photovoltaic power generation module, a power grid end, a factory load, an energy storage circuit and a monitoring system, wherein the photovoltaic power generation module is connected with the power grid end; the power grid end is connected with the power grid ammeter 1 and the high-voltage connecting switch K1 in series, then connected with a series circuit of the photovoltaic power generation module and the power grid ammeter 2 in parallel, and then connected with a factory load and an energy storage circuit respectively through the power grid ammeter 3; the energy storage circuit is formed by sequentially connecting an energy storage container system, a power grid ammeter 5 and a high-voltage connecting switch K2; after the photovoltaic modules in each photovoltaic power generation circuit are connected in series with the high-voltage connecting switch, the photovoltaic modules are connected in parallel to the power grid ammeter 4 to be connected with the energy storage container system; the monitoring system is used for acquiring the power grid ammeter data and switching the operation modes. The system controls each high-voltage connection switch by monitoring the power of photovoltaic power generation and the electric quantity condition of the energy storage container, and finally enables energy to be reasonably distributed to each module through connection of a high-voltage circuit, so that energy waste is avoided.
Description
Technical Field
The utility model belongs to the technical field of photovoltaic and energy storage grid-connected operation, and particularly relates to a photovoltaic energy storage grid-connected operation system.
Background
At present, electrochemical energy storage scale is larger and larger, industrial and commercial power stations using photovoltaic power distribution chemical energy storage are more and more, meanwhile, the proportion of wind and light distribution and storage in China is generally between 10% and 20%, and the comprehensive energy conversion efficiency of an energy storage system is about 85%, so that a specialized Energy Management System (EMS) and a reasonable grid-connected operation strategy are required to manage and schedule the whole system (comprising photovoltaic power generation, load, energy storage system and the like), and the optimal performance of the system is ensured to be exerted to the greatest extent. Various photovoltaic and energy storage industrial and commercial system power stations on the market at present, different P Photovoltaic device Different P Load(s) Different P Storage device According to the conventional control strategy, a large amount of clean energy is wasted, and a large amount of electric quantity on the power grid side is consumed. Therefore, for this situation, it is very necessary to develop a photovoltaic energy storage grid-connected operation system.
Disclosure of Invention
The utility model mainly aims to overcome the defects of the prior art, and provides a photovoltaic energy storage grid-connected operation system, wherein a monitoring system, a high-voltage connection switch and a power grid ammeter are added in the energy storage system, the high-voltage connection switches are controlled by monitoring the power of photovoltaic power generation and detecting the electric quantity condition of an energy storage container, and finally, energy is reasonably distributed to each module through the connection of a high-voltage circuit, so that the energy waste is avoided.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
the photovoltaic energy storage grid-connected operation system is characterized by comprising a photovoltaic power generation module, a power grid end, a factory load, an energy storage circuit and a monitoring system;
the power grid end is connected with the power grid ammeter 1 and the high-voltage connecting switch K1 in series, then connected with a series circuit of the photovoltaic power generation module and the power grid ammeter 2 in parallel, and then connected with a factory load and an energy storage circuit respectively through the power grid ammeter 3;
the photovoltaic power generation module comprises a plurality of photovoltaic power generation circuits; each photovoltaic power generation circuit comprises a photovoltaic module, a power grid ammeter and a high-voltage connection switch; the plurality of photovoltaic power generation circuits are connected in parallel;
the energy storage circuit is formed by sequentially connecting an energy storage container system, a power grid ammeter 5 and a high-voltage connecting switch K2;
after the photovoltaic modules in each photovoltaic power generation circuit are connected in series with the high-voltage connecting switch, the photovoltaic modules are connected in parallel to the power grid ammeter 4 to be connected with the energy storage container system;
the monitoring system is used for acquiring the power grid ammeter data and switching the operation modes.
Preferably, the grid end comprises an alternating current grid and a transformer assembly; the transformer component is connected into an alternating current power grid through a power grid ammeter, and the other end of the transformer component is connected in series with a high-voltage connecting switch K1 through a power grid ammeter 1; the total power of the transformer assembly is 800kVA.
Preferably, the energy storage container system comprises an energy storage converter, an energy storage battery, a battery management system, a high-low voltage power distribution cabinet and a confluence cabinet; the power of the energy storage converter is 500kW, and the capacity of the energy storage battery is 1MWH.
Preferably, the photovoltaic module converts solar energyFor electric energy, photovoltaic power generation P Photovoltaic device =600 kW; the plant load power P Load(s) ＝100kW。
Preferably, the operation modes include a grid-connected operation mode and an off-grid operation mode; when the photovoltaic energy storage grid-connected operation system is in a grid-connected operation mode, the high-voltage connection switch K1 is closed, the high-voltage connection switch in the photovoltaic power generation circuit is opened, the high-voltage connection switch connected with the photovoltaic module in series is closed, and the high-voltage connection switch K2 in the energy storage circuit is opened;
when the photovoltaic energy storage grid-connected operation system is in the off-grid operation mode, the high-voltage connection switch K1 is opened, the high-voltage connection switch in the photovoltaic power generation circuit is closed, the high-voltage connection switch connected with the photovoltaic module in series is opened, and the high-voltage connection switch K2 in the energy storage circuit is closed.
Preferably, when the system is in a grid-connected operation mode, the monitoring system detects that the grid ammeter 4 obtains photovoltaic power generation amount, and when P Photovoltaic device ＞P Load(s) And when the high-voltage connection switch K2 is closed, the electric energy generated by the photovoltaic module is transmitted to the factory load and the power grid end.
Compared with the prior art, the utility model has the following advantages and beneficial effects:
according to the utility model, the monitoring system, the high-voltage connecting switch and the power grid ammeter are added in the energy storage system, so that the circuit connection of the original energy storage system is improved, and on the premise of ensuring continuous operation of factory load according to rated power, whether the energy storage module needs to be charged or discharged or not can be managed in real time, thereby ensuring stable operation of the system and avoiding electric quantity loss; the added monitoring system monitors the electric network ammeter, when P Photovoltaic device ＞P Load(s) When the energy storage module is used, the energy storage module cannot store all redundant power, the control mode is switched, the new high-voltage connecting switch is turned on, the energy generated by the photovoltaic power generation module is absorbed in three parts, one part of the energy is supplied to the factory load for electricity, the other part of the energy is used for charging the energy storage container, and the other part of the energy can be released to the power grid, so that the utilization rate of green energy is greatly improved, and the waste of clean energy is avoided.
Drawings
FIG. 1 is a schematic diagram of a photovoltaic energy storage grid-connected operation system according to the present utility model;
FIG. 2 is a schematic diagram of a tank circuit according to the present utility model;
FIG. 3 is a schematic diagram of a photovoltaic energy storage grid-connected system according to the present utility model;
Detailed Description
The present utility model will be described in further detail with reference to examples and drawings, but embodiments of the present utility model are not limited thereto.
The traditional photovoltaic energy storage system converts solar energy into electric energy in a photovoltaic power generation mode, the electric energy is transmitted to a factory load and an energy storage container system, and due to the lack of corresponding monitoring points and high-voltage connection switches, the electric energy is transmitted to the factory load and the energy storage container system as long as the photovoltaic power generation is started, and the electric quantity use condition cannot be identified, so that the condition that equipment is not damaged in time due to energy switching is caused, and meanwhile, clean energy is wasted;
the embodiment of the utility model provides a photovoltaic energy storage grid-connected operation system based on the prior art, which can efficiently control the electric quantity balance of a photovoltaic power generation module and a factory load, can supply electric energy to the factory load and charge an energy storage circuit, and can feed back the electric energy to a power grid end.
In order to achieve the purpose, as shown in fig. 1, the embodiment provides a photovoltaic energy storage grid-connected operation system, which comprises a photovoltaic power generation module, a power grid end, a factory load, an energy storage circuit and a monitoring system;
the power grid end is connected with the power grid ammeter 1 and the high-voltage connecting switch K1 in series, then connected with a series circuit of the photovoltaic power generation module and the power grid ammeter 2 in parallel, and then connected with a factory load and an energy storage circuit respectively through the power grid ammeter 3;
the photovoltaic power generation module comprises a plurality of photovoltaic power generation circuits; each photovoltaic power generation circuit comprises a photovoltaic module, a power grid ammeter and a high-voltage connection switch; wherein, a plurality of photovoltaic power generation circuits are connected in parallel;
as shown in fig. 2, the energy storage circuit is formed by sequentially connecting an energy storage container system, a power grid ammeter 5 and a high-voltage connection switch K2;
after the photovoltaic modules in each photovoltaic power generation circuit are connected in series with the high-voltage connecting switch, the photovoltaic modules are connected in parallel to the power grid ammeter 4 to be connected with the energy storage container system;
the monitoring system is used for acquiring the power grid ammeter data and switching the operation modes.
In the following, a specific photovoltaic energy storage grid-connected operation system is taken as an example for further elaboration, as shown in fig. 3, the grid side in the embodiment includes an ac grid and a transformer assembly; the transformer component is connected into an alternating current power grid through a power grid ammeter 2, and the other end of the transformer component is connected in series with a high-voltage connecting switch K1 through a power grid ammeter 1; in this embodiment, the total power of the transformer assembly is 800kVA, and the voltage of the alternating current power grid is 10kV.
Further, the energy storage container system in the embodiment comprises an energy storage converter PCS, an energy storage battery, a battery management system BMS, a high-low voltage power distribution cabinet and a confluence cabinet; in this embodiment, the power of the energy storage converter PCS is 500kW, and the capacity of the energy storage battery is 1MWH.
Further, in the photovoltaic power generation mode in this embodiment, 2 photovoltaic power generation circuits are adopted, including a first photovoltaic power generation circuit and a second photovoltaic power generation circuit; the first photovoltaic power generation circuit comprises a photovoltaic module P1, a power grid ammeter 6 and a high-voltage connection switch K3; the second photovoltaic power generation circuit comprises a photovoltaic module P2, a power grid ammeter 7 and a high-voltage connecting switch K4; the first photovoltaic power generation circuit and the second photovoltaic power generation circuit are connected in parallel;
the photovoltaic module P1 is connected with the high-voltage connecting switch K5 in series, the photovoltaic module P2 is connected with the high-voltage connecting switch K6 in series, and the energy storage container system is connected with the power grid ammeter 4 after being connected in parallel. The photovoltaic module converts solar energy into electric energy, and photovoltaic power generation power P in the embodiment Photovoltaic device ＝600kW；
Further, the operation modes of the photovoltaic energy storage grid-connected operation system in the embodiment include a grid-connected operation mode and an off-grid operation mode; when the high-voltage connection switch K1 is closed, the system is in a grid-connected operation mode, in which the high-voltage connection switches K3 and K4 in the photovoltaic power generation circuit are opened, in this embodiment, the high-voltage connection switches connected in series with the photovoltaic module are closed, in this embodiment, the high-voltage connection switches K5 and K6 are closed, and the voltage connection switch K2 in the energy storage circuit is opened.
When the system is in a grid-connected operation mode, the monitoring system detects that the power grid ammeter 4 obtains photovoltaic power generation amount, and when P Photovoltaic device ＞P Load(s) When the photovoltaic power generation amount is larger than the load consumption amount (namely, the photovoltaic power generation amount is larger than the load consumption amount), the high-voltage connecting switch K2 is closed, and electric energy generated by the photovoltaic module is transmitted to a factory load and a power grid end; the monitoring system obtains energy storage absorption capacity (power grid ammeter 4-power grid ammeter 5) through the power grid ammeter 5, can also obtain power grid end energy through the power grid ammeter 1, and can obtain load consumption through the power grid ammeter 5-power grid ammeter 1, so that reasonable control of each energy source can be well controlled.
When the high-voltage connection switch K1 is disconnected, the system is in an off-grid operation mode, and the mode is as follows: the high-voltage connection switch K1 is opened, the high-voltage connection switches K3 and K4 in the photovoltaic power generation circuit are closed, that is, in the embodiment, the high-voltage connection switches K3 and K4 connected in series with the photovoltaic module are opened, that is, in the embodiment, the high-voltage connection switches K5 and K6 are opened, and the high-voltage connection switch K2 in the energy storage circuit is closed.
It should also be noted that in this specification, terms such as "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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. 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 utility model. Thus, the present utility model 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 (6)
1. The photovoltaic energy storage grid-connected operation system is characterized by comprising a photovoltaic power generation module, a power grid end, a factory load, an energy storage circuit and a monitoring system;
the power grid end is connected with the power grid ammeter 1 and the high-voltage connecting switch K1 in series, then connected with a series circuit of the photovoltaic power generation module and the power grid ammeter 2 in parallel, and then connected with a factory load and an energy storage circuit respectively through the power grid ammeter 3;
the photovoltaic power generation module comprises a plurality of photovoltaic power generation circuits; each photovoltaic power generation circuit comprises a photovoltaic module, a power grid ammeter and a high-voltage connection switch; the plurality of photovoltaic power generation circuits are connected in parallel;
the energy storage circuit is formed by sequentially connecting an energy storage container system, a power grid ammeter 5 and a high-voltage connecting switch K2;
after the photovoltaic modules in each photovoltaic power generation circuit are connected in series with the high-voltage connecting switch, the photovoltaic modules are connected in parallel to the power grid ammeter 4 to be connected with the energy storage container system;
the monitoring system is used for acquiring the power grid ammeter data and switching the operation modes.
2. The photovoltaic energy storage grid-tie operating system of claim 1, wherein the grid end comprises an ac grid and a transformer assembly; the transformer component is connected into an alternating current power grid through a power grid ammeter, and the other end of the transformer component is connected in series with a high-voltage connecting switch K1 through a power grid ammeter 1; the total power of the transformer assembly is 800kVA.
3. The photovoltaic energy storage grid-connected operation system according to claim 1, wherein the energy storage container system comprises an energy storage converter, an energy storage battery, a battery management system, a high-low voltage power distribution cabinet and a bus cabinet; the power of the energy storage converter is 500kW, and the capacity of the energy storage battery is 1MWH.
4. The grid-connected photovoltaic energy storage system according to claim 1, wherein the photovoltaic module converts solar energy into electrical energy and photovoltaic power generation P Photovoltaic device =600 kW; the plant load power P Load(s) ＝100kW。
5. The photovoltaic energy storage grid-tie operating system of claim 2, wherein the operating modes include a grid-tie operating mode and an off-grid operating mode; when the photovoltaic energy storage grid-connected operation system is in a grid-connected operation mode, the high-voltage connection switch K1 is closed, the high-voltage connection switch in the photovoltaic power generation circuit is opened, the high-voltage connection switch connected with the photovoltaic module in series is closed, and the high-voltage connection switch K2 in the energy storage circuit is opened;
when the photovoltaic energy storage grid-connected operation system is in the off-grid operation mode, the high-voltage connection switch K1 is opened, the high-voltage connection switch in the photovoltaic power generation circuit is closed, the high-voltage connection switch connected with the photovoltaic module in series is opened, and the high-voltage connection switch K2 in the energy storage circuit is closed.
6. The system according to claim 5, wherein the monitoring system detects that the grid electricity meter 4 obtains photovoltaic power generation when the system is in the grid-connected operation mode, when P Photovoltaic device ＞P Load(s) And when the high-voltage connection switch K2 is closed, the electric energy generated by the photovoltaic module is transmitted to the factory load and the power grid end.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320017527.XU CN219739974U (en) | 2023-01-05 | 2023-01-05 | Photovoltaic energy storage grid-connected operation system |
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| CN202320017527.XU CN219739974U (en) | 2023-01-05 | 2023-01-05 | Photovoltaic energy storage grid-connected operation system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118920563A (en) * | 2024-07-04 | 2024-11-08 | 中能建储能科技(武汉)有限公司 | Control method and control device of industrial and commercial energy storage system |
| CN120474075A (en) * | 2025-07-14 | 2025-08-12 | 中能建储能科技(武汉)有限公司 | Photovoltaic energy storage system and energy management method thereof |
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2023
- 2023-01-05 CN CN202320017527.XU patent/CN219739974U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118920563A (en) * | 2024-07-04 | 2024-11-08 | 中能建储能科技(武汉)有限公司 | Control method and control device of industrial and commercial energy storage system |
| CN118920563B (en) * | 2024-07-04 | 2025-10-24 | 中能建储能科技(武汉)有限公司 | A control method and control device for industrial and commercial energy storage system |
| CN120474075A (en) * | 2025-07-14 | 2025-08-12 | 中能建储能科技(武汉)有限公司 | Photovoltaic energy storage system and energy management method thereof |
| CN120474075B (en) * | 2025-07-14 | 2025-11-18 | 中能建储能科技(武汉)有限公司 | A photovoltaic energy storage system and its energy management method |
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