Supercapacitor-assisted frequency modulation system suitable for a plurality of units in thermal power station

Abstract

The invention discloses a supercapacitor-assisted frequency modulation system suitable for a plurality of units in a thermal power station, which includes a station service system and an energy storage system, wherein the energy storage system is connected to the two station buses of the station service system through two high-voltage switches. Specifically, the station service system includes twounit DCSs, two generators, two high-voltage station transformers, a first station bus, a first communication line, a second communication line, a second station bus and the like. The energy storage system includes two boost transformers, two bidirectional power conversion devices, two supercapacitors, a third communication line, two energy storage monitoring systems, a fourth communication line,a fifth communication line, a sixth communication line, two energy storage subsystems and the like. The supercapacitor-assisted frequency modulation system has clear and simple wiring, convenient switching, good safety, and a long service life, reduces throttling loss, prevents boiler over-temperature, reduces assessment and improves auxiliary income, and has considerable economical efficiency.

Description

technical field [0001] The invention relates to an energy storage auxiliary thermal power unit frequency modulation system, in particular to a supercapacitor auxiliary frequency modulation system suitable for multiple thermal power plant units. Background technique [0002] Since thermal power units are composed of mechanical devices with rotational inertia, and converting primary energy into electrical energy requires a series of complex processes, their response to active power regulation is slow. Under the background of continuous and rapid growth of new energy installed capacity and power generation, the demand for power grid frequency regulation and market size will become larger and larger, and thermal power units will take on more and more heavy frequency regulation tasks. Faced with negative impacts, it is not conducive to the economy, safety and reliability of the operation of the unit and the power grid. The power grid has an urgent need for high-quality frequency...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a new technology for the problems of heavy frequency modulation tasks of existing thermal power units, increased equipment wear, increased throttling loss, and potential safety hazards such as boiler overheating, under the background of continuous improvement of the existing frequency modulation auxiliary service market. It is suitable for the supercapacitor-assisted frequency modulation system of multiple units in thermal power plants. Its wiring is clear and simple, it is convenient to switch, it has good safety and long service life, reduces throttling loss, prevents boiler overheating, reduces assessment, improves auxiliary income, and is economical.

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