Wind power plant and photovoltaic power station matched energy storage system

Abstract

The utility model discloses a wind power plant and photovoltaic power station matched energy storage system, which comprises an energy storage system, an energy management system, a storage battery management system and a boost transformer system, and is characterized in that the energy storage system comprises a storage battery system and a power conversion system; the energy storage system is connected with a 35kV bus of the wind power plant and a 35kV bus of the photovoltaic power station through the boost transformer system. The energy management system is arranged on a station control layer, and the storage battery management system, the boost transformer system and the power conversion system are arranged on a spacing layer; the energy management system is connected with the storage battery management system, the boost transformer system, the power conversion system, the clock synchronization system of the wind power plant and the photovoltaic power station, the telecontrol system, the grid-connected point current and voltage data system and the AGC / AVC system. According to the utility model, the matched energy storage system is added, and the management control of the energy storage system is realized through the energy management system, so that the requirements of later-stage energy storage increase of built wind power plants and photovoltaic power stations are met.

Description

Technical Field

[0001] The utility model relates to the technical field of energy optimization systems, and in particular to a system for supporting energy storage in wind farms and photovoltaic power stations. Background Art

[0002] In order to improve the quality of grid-connected electricity from new energy sources, it is necessary to meet the requirements for new energy storage. For wind power and photovoltaic power stations, the requirement for configuring energy storage in proportion to installed power generation capacity is proposed, and the requirements for energy storage duration are clarified. For projects that have implemented the commitment to self-built energy storage, the actual configured capacity and duration will be used for deduction, and the shortfall will need to be configured separately. For existing new energy power generation projects, configuration according to the principle is also encouraged. Therefore, it is necessary to design a system for adding supporting energy storage to wind farms and photovoltaic power stations to meet the requirements for adding energy storage in the later stage of built wind farms and photovoltaic power stations. Utility Model Content

[0003] The purpose of the utility model is to overcome the deficiencies of the above-mentioned background technology and provide a system for supporting energy storage in wind farms and photovoltaic power stations.

[0004] To achieve the above-mentioned purpose, the utility model is designed to provide a wind farm and photovoltaic power station supporting energy storage system, including an energy storage system, an energy management system, a battery management system and a step-up transformer system. The energy storage system includes a battery system and a power conversion system; the energy storage system is connected to the 35kV busbar of the wind farm and photovoltaic power station through the step-up transformer system;

[0005] The energy management system is arranged at the station control layer, and the battery management system, the boost transformer system and the power conversion system are arranged at the interval layer; the energy management system is respectively connected to the battery management system, the boost transformer system, the power conversion system and the clock synchronization system, the telecontrol system, the grid-connected point current and voltage data system and the AGC / AVC system of the wind farm and the photovoltaic power station.

[0006] As a preferred implementation method, the energy management system includes a monitoring and maintenance workstation, a main EMS processing server, a backup EMS processing server, a coordination controller, a station-level switch A and a station-level switch B. The monitoring and maintenance workstation, the main EMS processing server, the backup EMS processing server, the coordination controller, the station-level switch A and the station-level switch B are all connected to the main network and the backup network of the station control layer.

[0007] As a preferred implementation, the monitoring and maintenance workstation, the main EMS processing server, the backup EMS processing server, and the coordination controller are connected to the clock synchronization systems of the wind farm and the photovoltaic power station respectively.

[0008] As a preferred implementation, the main EMS processing server and the backup EMS processing server are connected to the telecontrol systems of the wind farm and the photovoltaic power station respectively, and the telecontrol systems include telecontrol system A and telecontrol system B.

[0009] As a preferred implementation, the coordination controller is connected to the current and voltage data system of the wind farm and photovoltaic power station; the AGC / AVC system of the wind farm and photovoltaic power station is connected to the main network and backup network of the station control layer.

[0010] As a preferred implementation, the battery management system includes several battery management units and local monitoring devices, the battery management units are connected to the local monitoring devices, and the local monitoring devices are connected to the station control layer main network and backup network through the main switch and the backup switch.

[0011] As a preferred implementation, the boost transformer system includes a boost transformer and a 35kV bus, the low voltage side of the boost transformer is connected to the energy storage system, and the high voltage side of the boost transformer is connected to the 35kV bus;

[0012] A circuit breaker is also provided between the step-up transformer and the energy storage system, and a load switch is also provided between the step-up transformer and the 35kV busbar.

[0013] As a preferred implementation, the boost transformer system further includes a boost transformer measurement and control device, and the boost transformer measurement and control device is connected to the station control layer main network and backup network through a main switch and a backup switch.

[0014] As a preferred implementation, the battery system is composed of a plurality of battery clusters; the power conversion system includes a DC / AC bidirectional converter, and the battery system is connected to the step-up converter via the DC / AC bidirectional converter.

[0015] As a preferred implementation, the power conversion system further includes a monitoring unit, and the monitoring unit is connected to the main network and the backup network of the station control layer through the main switch and the backup switch.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] Firstly, the system of the utility model adds a supporting energy storage system, which boosts the voltage to 35kV level through the step-up transformer system and is connected to the 35kV bus section of the wind farm and photovoltaic power station, meeting the requirements of adding energy storage in the later stage of the built wind farm and photovoltaic power station.

[0018] Secondly, the energy management system (EMS) of the utility model is connected with the battery management system (BMS), power conversion system (PCS), boost transformer system, clock synchronization system, grid-connected point current and voltage data system, AGC / AVC system, and telecontrol system, and can realize the management and control of the energy storage system. The energy management system (EMS) can complete the monitoring and management functions of the battery management system (BMS), power conversion system (PCS) and boost transformer system, and ensure the normal operation of the energy storage system and boost system equipment.

[0019] Thirdly, the battery management system (BMS) of the present invention monitors the status of the battery system (temperature, voltage, current, state of charge, etc.) and provides a management and communication interface for the battery system.

[0020] Fourthly, the power conversion system (PCS) of the utility model realizes bidirectional energy transfer between the battery of the battery system energy storage system and the AC power grid, and is composed of a DC / AC bidirectional converter and a monitoring unit, etc. The monitoring unit provides a management and communication interface for the power conversion system (PCS). BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is an electrical principle wiring diagram of a system for energy storage in wind farms and photovoltaic power stations;

[0022] Figure 2 This is a network structure diagram of a system for supporting energy storage in wind farms and photovoltaic power stations.

[0023] In the figure, 1-energy storage system, 2-energy management system, 201-monitoring and maintenance workstation, 202-main EMS processing server, 203-standby EMS processing server, 204-coordination controller, 205-station switch A, 206-station switch B, 3-battery management system, 301-battery management unit, 302-on-site monitoring device, 4-boosting transformer system, 401-boosting transformer, 402-35kV bus, 403-circuit breaker, 404-load switch, 405-boosting transformer measurement and control device, 5-battery system, 501-battery cluster, 6-power conversion system, 601-DC / AC bidirectional converter, 602-monitoring unit, 7-clock synchronization system, 8-telecontrol system, 801-telecontrol system A, 802-telecontrol system B, 9-grid point current and voltage data system, 10-AGC / AVC system, 11-main switch, 12-standby switch. DETAILED DESCRIPTION

[0024] In order to facilitate the understanding of those skilled in the art, the present invention will be further described in detail below in conjunction with specific embodiments, but those skilled in the art will understand that the following embodiments are part of the present invention, not all of the embodiments, and are only used to illustrate the present invention, and should not be regarded as limiting the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0026] like Figure 1 and Figure 2 As shown, the utility model provides a wind farm and photovoltaic power station supporting energy storage system, including energy storage system 1, energy management system 2, battery management system 3 and step-up transformer system 4, energy storage system 1 includes battery system 5 and power conversion system 6; energy storage system 1 is stepped up to 35kV voltage level through step-up transformer system 4 and connected to 35kV bus section of wind farm and photovoltaic power station. Energy management system 2 is respectively connected to battery management system 3, step-up transformer system 4, power conversion system 6 and clock synchronization system 7, telecontrol system 8, grid connection point current and voltage data system 9 and AGC / AVC system 10 of wind farm and photovoltaic power station to realize management and control of energy storage system.

[0027] In order to enable the energy management system to complete the management function of the battery management system, the monitoring unit of the power conversion system and the boost transformer measurement and control device, a network architecture with two layers of equipment, namely, the spacer layer equipment and the station control layer equipment and one layer of network, is established. The first layer of network uses dual Ethernet as the main network and backup network of the station control layer. The station control layer equipment includes the energy management system 2, and the spacer layer equipment includes the battery management system 3, the boost transformer system 4, the power conversion system 6, the main switch 11 and the backup switch 12.

[0028] The energy management system 2 includes a monitoring and maintenance workstation 201, a main EMS processing server 202, a backup EMS processing server 203, a coordination controller 204, a station-level switch A205, and a station-level switch B206. The monitoring and maintenance workstation 201, the main EMS processing server 202, the backup EMS processing server 203, the coordination controller 204, the station-level switch A205, and the station-level switch B206 are all connected to the main network and the backup network of the station control layer. The energy management system 2 completes the monitoring and management functions of the battery management system, the power conversion system, and the boost transformer system to ensure the normal operation of the energy storage system and the boost system equipment.

[0029] The monitoring and maintenance workstation 201, the main EMS processing server 202, the backup EMS processing server 203, and the coordination controller 204 are respectively connected to the clock synchronization system 7 of the wind farm and the photovoltaic power station, and network time is synchronized through the clock synchronization system.

[0030] The main EMS processing server 202 and the backup EMS processing server 203 are respectively connected to the telecontrol system 8 of the wind farm and the photovoltaic power station. The telecontrol system 8 includes the telecontrol system A801 ​​and the telecontrol system B802. The main EMS processing server 202 and the backup EMS processing server 203 are respectively connected to the telecontrol system 8 to realize the transmission function of telecontrol information.

[0031] The coordination controller 204 is connected to the current and voltage data system 9 of the wind farm and photovoltaic power station grid connection point; the coordination controller accesses the current and voltage data of the wind farm and photovoltaic power station grid connection point through AC quantity collection, and is mainly used to coordinate and control multiple power conversion systems to achieve advanced control functions, such as fast power tracking response, auxiliary frequency regulation, voltage regulation, etc. The AGC / AVC system 10 of the wind farm and photovoltaic power station is connected to the main network and backup network of the station control layer.

[0032] The battery management system 3 includes several battery management units 301 and local monitoring devices 302. The battery management units 301 are connected to the local monitoring devices 302. The local monitoring devices 302 are connected to the main network and the backup network of the station control layer through the main switch 11 and the backup switch 12. The battery management system 3 monitors the state temperature, voltage, current, charge state, etc. of the battery system and provides management and communication interfaces for the battery system.

[0033] The step-up transformer system 4 includes a step-up transformer 401 and a 35kV bus 402. The low-voltage side of the step-up transformer 401 is connected to the energy storage system 1, and the high-voltage side of the step-up transformer 401 is connected to the 35kV bus 402. A circuit breaker 403 is also provided between the step-up transformer 401 and the energy storage system 1, and a load switch 404 is also provided between the step-up transformer 401 and the 35kV bus 402. The step-up transformer system 4 also includes a step-up transformer measurement and control device 405, which is connected to the main network and the backup network of the station control layer through the main switch 11 and the backup switch 12. The step-up transformer measurement and control device provides management and communication interfaces for the step-up transformer system. In order to reduce the interface with the original system, the AC power supply of the battery and the low-voltage electrical equipment of the PCS container, such as air conditioning, lighting, measurement and control devices, control power supply, etc., is taken from the low-voltage side of the step-up transformer.

[0034] The power conversion system 6 includes a DC / AC bidirectional converter 601, and the battery system 5 is connected to the step-up converter 4 through the DC / AC bidirectional converter 601. The battery system 5 is composed of a plurality of battery clusters 501. The power conversion system 6 also includes a monitoring unit 602, and the monitoring unit 602 is connected to the main network and the backup network of the station control layer through the main switch 11 and the backup switch 12. The power conversion system realizes bidirectional energy transfer between the battery system and the AC power grid, and the monitoring unit provides a management and communication interface for the power conversion system.

[0035] The above are only specific implementation methods of the present invention. It should be pointed out that any changes or substitutions that can be easily thought of by any technician familiar with the field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention, and the rest not described in detail belong to the prior art.

Claims

1. A system for supporting energy storage in wind farms and photovoltaic power stations, characterized in that: The invention comprises an energy storage system (1), an energy management system (2), a battery management system (3) and a step-up transformer system (4); the energy storage system (1) comprises a battery system (5) and a power conversion system (6); the energy storage system (1) is connected to a 35 kV bus section of a wind farm and a photovoltaic power station through the step-up transformer system (4); The energy management system (2) is arranged at the station control layer, and the battery management system (3), the step-up transformer system (4) and the power conversion system (6) are arranged at the interval layer; the energy management system (2) is respectively connected to the battery management system (3), the step-up transformer system (4), the power conversion system (6) and the clock synchronization system (7), the telecontrol system (8), the grid connection point current and voltage data system (9) and the AGC / AVC system (10) of the wind farm and the photovoltaic power station; The energy management system (2) comprises a monitoring and maintenance workstation (201), a main EMS processing server (202), a backup EMS processing server (203), a coordination controller (204), a station-level switch A (205) and a station-level switch B (206); the monitoring and maintenance workstation (201), the main EMS processing server (202), the backup EMS processing server (203), the coordination controller (204), the station-level switch A (205) and the station-level switch B (206) are all connected to a station control layer main network and a backup network; The battery management system (3) comprises a plurality of battery management units (301) and a local monitoring device (302), wherein the battery management unit (301) is connected to the local monitoring device (302), and the local monitoring device (302) is connected to a main network and a backup network of a station control layer via a main switch (11) and a backup switch (12); The step-up transformer system (4) comprises a step-up transformer (401) and a 35 kV busbar (402), the low voltage side of the step-up transformer (401) is connected to the energy storage system (1), and the high voltage side of the step-up transformer (401) is connected to the 35 kV busbar (402); The battery system (5) is composed of a plurality of battery clusters (501); the power conversion system (6) includes a DC / AC bidirectional converter (601), and the battery system (5) is connected to the step-up converter system (4) via the DC / AC bidirectional converter (601).

2. The system for supporting energy storage for wind farms and photovoltaic power stations according to claim 1 is characterized in that: The monitoring and maintenance workstation (201), the main EMS processing server (202), the standby EMS processing server (203), and the coordination controller (204) are respectively connected to the clock synchronization systems (7) of the wind farm and the photovoltaic power station.

3. The system for supporting energy storage for wind farms and photovoltaic power stations according to claim 2 is characterized in that: The main EMS processing server (202) and the standby EMS processing server (203) are respectively connected to the telecontrol systems (8) of the wind farm and the photovoltaic power station, and the telecontrol systems (8) include a telecontrol system A (801) and a telecontrol system B (802).

4. The system for supporting energy storage for wind farms and photovoltaic power stations according to claim 3 is characterized in that: The coordination controller (204) is connected to the grid-connected point current and voltage data system (9) of the wind farm and photovoltaic power station; the AGC / AVC system (10) of the wind farm and photovoltaic power station is connected to the main network and backup network of the station control layer.

5. The system for supporting energy storage for wind farms and photovoltaic power stations according to claim 4 is characterized in that: A circuit breaker (403) is also provided between the step-up transformer (401) and the energy storage system (1), and a load switch (404) is also provided between the step-up transformer (401) and the 35 kV bus (402).

6. The system for supporting energy storage for wind farms and photovoltaic power stations according to claim 5 is characterized in that: The step-up transformer system (4) further comprises a step-up transformer measurement and control device (405), and the step-up transformer measurement and control device (405) is connected to the station control layer main network and the backup network through the main switch (11) and the backup switch (12).

7. The wind farm and photovoltaic power station supporting energy storage system according to claim 6, characterized in that: The power conversion system (6) further comprises a monitoring unit (602), wherein the monitoring unit (602) is connected to a main network and a backup network of a station control layer via a main switch (11) and a backup switch (12).

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