System for improving power flexibility and method thereof

Abstract

The invention discloses a system for improving power flexibility and a method thereof. The system is composed of a multi-stage compressor, a multi-stage cooler, a gas-liquid conversion device, a liquid air storage tank, a multi-stage heater, a multi-stage expander, a heat storage system, a generator set, a flexibility control device and a control valve; and the operation method of the system comprises an energy storage mode and an energy release mode. When the system and the method thereof are applied to a coal-fired power plant, the peak regulation capacity and the response speed of the unitcan be improved, the frequency modulation performance of the unit is improved, the stability of electric output power can be improved when the system and the method thereof are applied to a photovoltaic power plant and a wind power plant, and the new energy consumption capacity of a power grid is improved.

Description

technical field [0001] The invention belongs to the technical field of energy storage and peak regulation, and specifically relates to a system and method for improving power flexibility. It is suitable for power plants with flexibility requirements such as coal-fired units, and also for power plants that require stable output such as photovoltaics and wind power. Improve the power quality of the power plant and improve the stability of the power system. Background technique [0002] At present, my country's wind energy, solar energy and other renewable energy sources are developing rapidly year by year. In addition, the electricity consumption of the whole society is increasing year by year, and the peak-to-valley difference in power consumption of the power grid is increasing. [0003] At present, the technologies to improve the peak-shaving capability of coal-fired units mainly include electric boiler heat storage technology, water tank heat storage technology, steam turb...

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Problems solved by technology

[0003] At present, the technologies to improve the peak-shaving capability of coal-fired units mainly include electric boiler heat storage technology, water tank heat storage technology, steam turbine steam process transformation technology, electrochemical battery energy storage technology, etc. Electric boiler heat storage technology is to convert electric energy into heat energy. It is used for heating and has strong peak-shaving ability, but the energy quality is greatly reduced, and it is only suitable for cogeneration units. Water tank heat storage technology and steam turbine steam process transformation technology have better thermal economy and relatively low investment, but the peak-shaving ability is limited. , and is only applicable to combined heat and power units. Electrochemical battery energy storage technology has fast response, small size, and short construction period, but has short life, high average cost, and high safety risk. Whether it is suitable for large-scale energy storage implementation still needs engineering demonstration verification

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