Transformer area flexible interconnection system

Abstract

The utility model provides a transformer area flexible interconnection system. The system comprises a direct current power supply module, a bidirectional converter and an energy management system. The direct-current power supply module can be used as a power supply for mutual assistance and transfer among the transformer areas, and is connected with one end of the bidirectional converter; the other end of the bidirectional converter is connected with any transformer area and is responsible for converting direct current into alternating current, so that access of the direct current and flexible conversion of electric energy are realized; the energy management system is interconnected with the bidirectional converter, monitors the load condition, the power generation condition and the electric energy flow condition of the transformer area in real time, and controls the direct current power supply module to optimize and dispatch the power supply of a transformer area power grid according to real-time data, thereby solving the problem of power failure of the transformer area or insufficient load power, and improving the power supply stability of a user side. In addition, the direct-current power supply module can provide clean energy such as wind energy and solar energy, and the utilization efficiency of the clean energy is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of smart grids, in particular to a flexible interconnection system for substations. Background Art

[0002] With the rapid development of society and the economy, the demand for electric energy continues to grow. Traditional thermal power generation faces challenges such as high resource consumption and severe environmental pollution. To achieve sustainable development, the development and utilization of clean energy has become an inevitable trend. Clean energy sources such as wind and solar energy offer advantages such as being renewable and environmentally friendly, but their generation is volatile and intermittent, making direct grid connection difficult.

[0003] The existing power distribution system primarily relies on AC power supply, making it difficult to achieve power sharing and transfer between different substations. When a substation experiences overload or a power outage, it is difficult to obtain power from other substations, resulting in reduced power supply reliability. Furthermore, the existing distribution system is difficult to connect to DC power sources, limiting the use of clean energy. Utility Model Content

[0004] The utility model provides a flexible interconnection system for a transformer substation, aiming to solve the problem of power outage in the transformer substation or insufficient power due to excessive load in the transformer substation.

[0005] The utility model provides a flexible interconnection system for substations, including: a DC power supply module, an energy management system and a bidirectional converter;

[0006] The DC power supply module is electrically connected to one end of the bidirectional converter, and the other end of the bidirectional converter is electrically connected to the power supply area of ​​the substation; the bidirectional converter is interconnected with the energy management system and the distribution transformer control device in the substation.

[0007] Furthermore, the substation power supply area is connected to the bidirectional converter in a one-to-one correspondence via an AC line.

[0008] Furthermore, an AC side incoming line switch is provided on the AC line;

[0009] The substation power supply area is connected to the bidirectional converter via an AC side incoming line switch on an AC line.

[0010] Furthermore, a transformer is provided on the AC line;

[0011] The substation power supply area is connected to the bidirectional converter in sequence through a transformer on an AC line and an AC side incoming line switch.

[0012] Furthermore, it further comprises: a DC side reserved switch, wherein the bidirectional converter is connected to one end of the DC side reserved switch via a DC bus;

[0013] The other end of the DC side reserved switch is connected to the DC power supply module.

[0014] Furthermore, the plurality of bidirectional converters, AC side incoming line switches, DC bus, DC side reserved switches and energy management system together constitute a substation flexible interconnection cabinet.

[0015] Furthermore, the DC power supply module includes at least one of a DC source, a DC charge and an energy storage system.

[0016] Furthermore, the DC source includes a solar panel, a wind generator and a fuel cell.

[0017] Furthermore, it also includes: an energy storage module, which is connected to the DC power supply module.

[0018] Furthermore, the bidirectional converter is interconnected with the energy management system and the distribution transformer control device in the substation through wired communication, wireless communication or carrier communication.

[0019] Compared with the prior art, the present invention has at least the following technical effects:

[0020] In the present invention, the DC power supply module can serve as a power source for mutual assistance and transfer between substations. The module is connected to one end of a bidirectional converter; the other end of the bidirectional converter is connected to any substation, responsible for converting DC power into AC power, realizing DC access and flexible conversion of electric energy; the energy management system is interconnected with the bidirectional converter to monitor the substation load, power generation, and power flow in real time, and controls the DC power supply module based on real-time data to optimize the power supply of the substation grid, solving the problem of power outages or insufficient power due to excessive load, and improving the power supply stability on the user side. In addition, the DC power supply module can provide clean energy such as wind and solar energy, improving the utilization efficiency of clean energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a simplified structural diagram of the flexible interconnection system in the substation area in one embodiment of the present utility model. DETAILED DESCRIPTION

[0022] The following description of a flexible interconnection system for metro stations of the present invention is provided in conjunction with schematic diagrams, which illustrate preferred embodiments of the present invention. It should be understood that those skilled in the art may modify the present invention as described herein while still achieving the beneficial effects of the present invention. Therefore, the following description should be understood as a general guide for those skilled in the art and not as a limitation of the present invention.

[0023] The following paragraphs describe the present invention in more detail by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are greatly simplified and not to exact scale, and are intended solely to facilitate and clearly illustrate the embodiments of the present invention.

[0024] Please refer to Figure 1 , this embodiment provides a flexible interconnection system for a substation, including: a DC power supply module, an energy management system (EMS) and a bidirectional converter (PCS).

[0025] Specifically, the DC power supply module is electrically connected to one end of the bidirectional converter, and the other end of the bidirectional converter is electrically connected to the substation power supply area; the bidirectional converter is interconnected with the energy management system and the distribution transformer control device in the substation.

[0026] In this embodiment, the DC power supply module can serve as a power source for mutual assistance and transfer between substations, as well as a backup power source for each substation. The module is connected to one end of a bidirectional converter; the other end of the bidirectional converter is connected to any substation, responsible for converting DC power into AC power, enabling DC access and flexible conversion of electrical energy; the energy management system is interconnected with the bidirectional converter to monitor the substation load, power generation, and power flow in real time, and controls the DC power supply module based on real-time data to optimize the power supply of the substation grid, solving the problem of power outages or insufficient power due to excessive load, thereby improving the power supply stability on the user side. In addition, the DC power supply module can provide clean energy such as wind and solar energy, improving the utilization efficiency of clean energy.

[0027] In a specific embodiment, the substation power supply area is powered by an overhead line, which is connected to a substation. An additional AC line is connected to the substation flexible interconnection cabinet in a container or distribution station building in the substation. The AC line is connected to a transformer T1 and an AC side incoming line switch K1. After the voltage on the overhead line is transformed by the transformer T1 in the substation, the 10KV voltage on the overhead line is converted to a user-side voltage of 400V in the substation power supply area. Furthermore, the AC line is connected to the bidirectional converter in turn through the transformer and the AC side incoming line switch K1, and converges through the bidirectional converter to form a DC bus. The DC bus is connected to the DC switch, which is connected to the DC power supply module via a DC cable. The DC power supply module is connected to the energy storage module. The bidirectional converter is interconnected with the energy management system and the substation power supply area.

[0028] In this embodiment, the power supply area of ​​the substation may be a residential area, a commercial area, an industrial area, etc. in a city.

[0029] In this embodiment, the plurality of bidirectional converters, the DC bus, the DC side reserved switch K2 and the energy management system together constitute the substation flexible interconnection cabinet 1.

[0030] In another specific embodiment, a substation flexible interconnect cabinet 1 may contain multiple bidirectional converters, for example, three, four, or five, without specific limitation. Each substation is connected to a corresponding bidirectional converter, and a single energy management system can control the DC power supply module to supply power to multiple substations.

[0031] In another specific embodiment, the AC side incoming line switch K1 may also be set to multiple, such as 2, 3, and 4, or may be set to only one.

[0032] In another specific embodiment, the energy storage unit can be a battery, a supercapacitor, a flywheel energy storage, etc. The energy storage unit is used to store electrical energy supplied to the DC power supply module. It can be understood that those skilled in the art can select different energy storage units according to actual conditions.

[0033] In another specific embodiment, the DC side reserved switch K2 includes, but is not limited to, a DC busbar disconnector, a DC circuit breaker, and a DC fuse. The AC side incoming line switch K1 includes, but is not limited to, an AC outgoing line circuit breaker, an AC load switch, and an AC disconnector. It will be appreciated that those skilled in the art may select different types of DC side reserved switch K2 and AC side incoming line switch K1 based on practical circumstances.

[0034] In this embodiment, the DC power supply module includes at least one of a DC source, a DC charge, and an energy storage system.

[0035] Specifically, the DC source includes, but is not limited to, solar panels, wind turbines, and fuel cells; the energy storage system includes, but is not limited to, supercapacitor energy storage systems, lithium battery energy storage systems, and lead-acid battery energy storage systems; and the DC charger includes, but is not limited to, DC relays, DC capacitors, and DC power adapters. It is understood that those skilled in the art can select different DC power supply modules based on actual circumstances.

[0036] In another specific embodiment, the bidirectional converter is interconnected with the energy management system and the distribution transformer measurement and control device corresponding to the substation through wired communication, wireless communication or carrier communication.

[0037] Specifically, the wired communication includes but is not limited to optical fiber communication, twisted pair communication, coaxial cable communication and power line communication; the wireless communication includes but is not limited to wireless local area network (Wi-Fi), cellular network and radio frequency identification communication, and the carrier communication includes but is not limited to power line carrier communication (PLC), television line carrier communication (TVLC) and cable television network (CATV).

[0038] In this embodiment, the technical effects that can be achieved after the above-mentioned flexible interconnection system is connected to each substation include:

[0039] The EMS is connected to the distribution transformer measurement and control device in the substation area through communication, and collects data such as the operating status, load conditions, voltage, current, and power factor of the substation area distribution transformer in real time. The EMS monitors the collected data in real time. When abnormal conditions such as transformer overload, power outage, and excessive load occur in the substation area, the energy management system controls the DC power supply module to output DC power, which is converted into AC voltage through a bidirectional converter and transmitted to the power supply area of ​​the substation area to assist in power exchange and transfer between substations, or directly restore power supply to the substation area. In addition, the EMS also collects data such as the operating status, output power, input power, DC voltage, and DC current of the bidirectional converter to monitor and adjust the voltage output of the DC power supply module.

[0040] Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. A flexible interconnection system for substations, characterized in that: include: DC power supply modules, energy management systems, and bidirectional converters; The DC power supply module is electrically connected to one end of the bidirectional converter, and the other end of the bidirectional converter is electrically connected to the power supply area of ​​the substation; the bidirectional converter is interconnected with the energy management system and the distribution transformer control device in the substation.

2. The flexible interconnection system of the substation according to claim 1, characterized in that: The substation power supply area is connected to the bidirectional converter in a one-to-one correspondence via an AC line.

3. The flexible interconnection system of the substation according to claim 2, characterized in that: The AC line is provided with an AC side incoming line switch; The substation power supply area is connected to the bidirectional converter via an AC side incoming line switch on an AC line.

4. The flexible interconnection system of the substation according to claim 3, characterized in that: A transformer is also provided on the AC line; The substation power supply area is connected to the bidirectional converter in sequence through a transformer on an AC line and an AC side incoming line switch.

5. The flexible interconnection system of the substation area according to claim 3, characterized in that: Also includes: A DC side reserved switch, wherein the bidirectional converter is connected to one end of the DC side reserved switch via a DC bus; The other end of the DC side reserved switch is connected to the DC power supply module.

6. The flexible interconnection system of the substation area according to claim 5, characterized in that: The plurality of bidirectional converters, AC side incoming line switches, DC busbars, DC side reserved switches and energy management systems together constitute a flexible interconnection cabinet in the substation area.

7. The flexible interconnection system of the substation area according to claim 1, characterized in that: The DC power supply module includes at least one of a DC source, a DC charge and an energy storage system.

8. The flexible interconnection system of the substation area according to claim 7, characterized in that: The DC sources include solar panels, wind turbines and fuel cells.

9. The flexible interconnection system of the substation area according to claim 8, characterized in that: Also includes: An energy storage module is connected to the DC power supply module.

10. The flexible interconnection system of the substation area according to claim 1, characterized in that: The bidirectional converter is interconnected with the energy management system and the distribution transformer control device in the substation through wired communication, wireless communication or carrier communication.

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