A compressed air energy storage power station system integrated with flywheel energy storage

Abstract

The utility model belongs to the field of power generation and energy storage control technology, specifically discloses a kind of compressed air energy storage power station system of integrated flywheel energy storage. Including control architecture and power architecture: control architecture includes the coordination controller for regulating and controlling multiple energy storage devices, coordination controller is connected with compressor control system, flywheel energy storage system and distributed control system communication respectively, and distributed control system is connected with turbine electro-hydraulic regulating module communication;Power architecture includes the armature of flywheel energy storage system in turn through power conversion system, energy storage transformer is connected to the storage / release energy loop of compressed air energy storage power station main transformer low voltage side, and the station electricity loop of the power inlet of connecting energy storage transformer low voltage side and control architecture. Solve the single compressed air energy storage response speed slower, and single flywheel energy storage although response speed is fast, but the technical problem of limited energy storage capacity. Suitable for compressed air energy storage power station to promote use in grid source / demand balance regulation and control project.

Description

Technical Field

[0001] This utility model belongs to the field of power generation and energy storage control technology, and specifically discloses a compressed air energy storage power station system integrating flywheel energy storage. Background Technology

[0002] In today's energy sector, with the increasing global demand for clean energy and the continuous development of power systems, efficient energy storage technology and stable grid frequency regulation methods have become crucial.

[0003] Traditional energy power generation suffers from environmental pollution and limited resources. While new energy power generation, such as wind and solar power, is environmentally friendly, its output power is unstable, intermittent, and fluctuating due to natural conditions, posing a significant challenge to the stable operation of the power grid. For example, in wind power generation, uncontrollable wind speeds lead to frequent changes in power output, and photovoltaic power generation cannot provide a continuous and stable supply due to factors such as day-night cycles and weather changes. When a large amount of unstable new energy is connected to the grid, it exacerbates grid frequency fluctuations, seriously affecting power quality and the safe and stable operation of the power grid.

[0004] To address these challenges, energy storage and grid frequency regulation technologies are crucial. Compressed air energy storage (CASS), as an important large-scale physical energy storage technology, possesses numerous advantages. During the storage phase, off-peak electricity is used to drive a compressor to compress and store air, converting electrical energy into the air's internal energy and pressure potential energy. In the release phase, the high-pressure air is released, driving a turbine generator to produce electricity again. Compared to pumped hydro storage, it is not strictly limited by geographical conditions, has a short construction cycle, does not require large-scale water conservancy facilities or large amounts of water resources, reducing its impact on the ecological environment and the issues of resettlement. Compared to lithium battery energy storage, CASS has a longer lifespan, more cycle life, higher safety, and does not suffer from safety hazards such as battery thermal runaway. It is also clean and pollution-free, its system performance does not degrade over time, and it possesses frequency and voltage regulation performance, rotational inertia, and short-circuit current support capabilities similar to traditional thermal power, which is beneficial for the safe and stable operation of the power system in future high-proportion renewable energy scenarios.

[0005] Flywheel energy storage is a mechanical energy storage device that uses a motor to convert electrical energy into the kinetic energy of a high-speed rotating flywheel for storage. In the field of power grid frequency regulation, it can quickly absorb or release energy and accurately track rapid changes in power grid frequency due to its high response speed and high energy conversion efficiency. When the power grid frequency fluctuates, the flywheel can respond within milliseconds, rapidly adjusting its rotation speed to achieve rapid energy throughput and effectively smooth out power grid power fluctuations. It is very suitable for power grid frequency regulation scenarios where power needs to fluctuate frequently.

[0006] Currently, frequency regulation in thermal power plants mainly relies on traditional power generation equipment. However, with the increasing proportion of renewable energy, this method is gradually becoming insufficient to meet the rapidly changing frequency regulation demands. While single compressed air energy storage power stations perform well in large-scale energy storage and peak shaving, they have a slow response speed and a frequency regulation dead zone when dealing with rapid and small fluctuations in grid frequency. When load changes cause grid frequency fluctuations within the frequency regulation dead zone, the operating conditions of the compressed air energy storage system remain unchanged, making it unable to improve the grid frequency in a timely manner. On the other hand, while single flywheel energy storage has a fast response speed, its energy storage capacity is limited, making it difficult to provide continuous frequency regulation services for extended periods.

[0007] In summary, existing energy storage technologies and frequency regulation methods have their own limitations and cannot meet the stringent requirements of modern power systems for stability, reliability, and efficiency. Therefore, the integrated application of compressed air energy storage, flywheel energy storage, and power plant frequency regulation, leveraging their synergistic advantages and achieving complementary strengths, is of significant practical importance and has broad application prospects for improving the stability and reliability of power systems and promoting the large-scale consumption of new energy sources. This is also a key issue and research hotspot that power generation industry technicians urgently need to address. Utility Model Content

[0008] To address the technical problems listed in the background section, this utility model provides a compressed air energy storage power station system integrating flywheel energy storage. The specific technical solution is as follows:

[0009] A compressed air energy storage power station system integrating flywheel energy storage, comprising a control architecture and a power architecture:

[0010] The control architecture includes a coordination controller for regulating multiple energy storage devices. The coordination controller is communicatively connected to the compressor control system, the flywheel energy storage system and the distributed control system, respectively. The distributed control system is communicatively connected to the turbine electro-hydraulic regulation module.

[0011] The power architecture includes an energy storage / release circuit where the armature of the flywheel energy storage system is connected to the low-voltage side of the main transformer of the compressed air energy storage power station via a power conversion system and an energy storage transformer, and a station power circuit connecting the low-voltage side of the energy storage transformer and the power input of the control architecture.

[0012] Preferably, the flywheel energy storage system includes one or more flywheel-to-power conversion system groups, and the control system of each flywheel-to-power conversion system group is communicatively connected to a coordinating controller.

[0013] Preferably, the compressor control system, the coordination controller, the distributed control system and the power plant electrical monitoring system are connected in communication, and the power plant electrical monitoring system is connected in communication with the dispatch terminal.

[0014] Preferably, the working fluid of the turbine controlled by the turbine electro-hydraulic regulation module includes one or more of the following: air, steam, fuel gas, and water.

[0015] Compared with the prior art, this utility model has the following advantages:

[0016] This utility model provides a compressed air energy storage power station system integrating flywheel energy storage, combining compressed air energy storage, flywheel energy storage, and power plant frequency regulation to achieve complementary advantages. It solves the technical problems of single compressed air energy storage power stations having slow response speeds, frequency regulation dead zones, and inability to promptly improve grid frequencies; and single flywheel energy storage, while having fast response speeds, having limited energy storage capacity and difficulty in providing continuous frequency regulation services for extended periods. This significantly improves the response speed, stability, and economy of frequency regulation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the power architecture of the compressed air energy storage power station system integrating flywheel energy storage in an embodiment of this utility model;

[0018] Figure 2 This is a schematic diagram of the control architecture of a compressed air energy storage power station system integrating flywheel energy storage in an embodiment of this utility model. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] refer to Figure 1-2 This embodiment provides a compressed air energy storage power station system integrating flywheel energy storage, including a control architecture and a power architecture:

[0021] The control architecture includes a coordination controller for regulating multiple energy storage devices. The coordination controller is communicatively connected to the compressor control system (CCS system), the flywheel energy storage system, and the distributed control system (DCS system). The distributed control system is communicatively connected to the turbine electro-hydraulic regulation module (DEH system).

[0022] The power architecture includes an energy storage / release circuit where the armature of the flywheel energy storage system is connected to the low-voltage side of the main transformer of the compressed air energy storage power station via a power conversion system and an energy storage transformer, and a station power circuit connecting the low-voltage side of the energy storage transformer and the power input of the control architecture.

[0023] The flywheel energy storage system includes one or more flywheel-to-power conversion system groups, and the control system of each flywheel-to-power conversion system group is communicatively connected to the coordinating controller. The compressor control system, coordinating controller, and distributed control system are communicatively connected to the power plant electrical monitoring system, which in turn is communicatively connected to the dispatching terminal. The working fluid of the turbine, regulated by the turbine electro-hydraulic regulating module, is air.

[0024] The system can operate in several modes depending on the actual power load changes on site.

[0025] Mode 1: During the expansion and energy release phase of the compressed air energy storage power station, the power station generates electricity for the external power grid.

[0026] The coordinating controller reads the frequency from the DCS system and, upon determining that frequency regulation is needed, prioritizes controlling the flywheel energy storage system to participate in frequency regulation. Because the flywheel energy storage system has a fast frequency regulation response, it can significantly reduce the number of times the turbine generator set needs to be regulated through the DEH system.

[0027] When the coordinating controller determines that the frequency regulation duration or power requirement exceeds the system's capacity, it feeds back the control demand to the DCS, which then issues instructions to adjust the turbine unit through the DEH system to meet the system's requirements.

[0028] Because in compressed air energy storage power stations, the remote control function is integrated into the electrical monitoring system of the compressed air energy storage power station, the coordinating controller can transmit and receive instructions from the dispatching terminal through the electrical monitoring system of the compressed air energy storage power station.

[0029] Mode 2: In the compressed air energy storage stage of the power station, the power station supplies power to the compressor motor through the power grid and stores air through the compressor.

[0030] In this mode, the compressed air energy storage power station mainly responds to the primary frequency regulation of the power grid by adjusting the power consumption of the compressor motor.

[0031] Commands can be directly issued to the CCS through the remote control module in the electrical monitoring system; commands can also be issued to the coordination controller through the remote control module in the electrical monitoring system, and the coordination controller will issue commands to respond to the primary frequency regulation of the power grid.

[0032] Regardless of the mode, the flywheel energy storage system can also be controlled and have its status information obtained through a monitoring and maintenance workstation.

[0033] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A compressed air energy storage power station system integrating flywheel energy storage, comprising a control architecture and a power architecture, characterized in that: The control architecture includes a coordination controller for regulating multiple energy storage devices. The coordination controller is communicatively connected to the compressor control system, the flywheel energy storage system and the distributed control system, respectively. The distributed control system is communicatively connected to the turbine electro-hydraulic regulation module. The power architecture includes an energy storage / release circuit where the armature of the flywheel energy storage system is connected to the low-voltage side of the main transformer of the compressed air energy storage power station via a power conversion system and an energy storage transformer, and a station power circuit connecting the low-voltage side of the energy storage transformer and the power input of the control architecture.

2. The compressed air energy storage power plant system integrated with flywheel energy storage of claim 1, wherein, The flywheel energy storage system includes one or more flywheel-to-power conversion system groups, and the control system of each flywheel-to-power conversion system group is communicatively connected to the coordinating controller.

3. The compressed air energy storage power plant system integrated with flywheel energy storage of claim 2, wherein, The compressor control system, coordination controller, distributed control system and power plant electrical monitoring system are connected in communication, and the power plant electrical monitoring system is connected in communication with the dispatch terminal.

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