Flywheel energy storage control method and device

Abstract

The embodiment of the invention provides a flywheel energy storage control method and device. The method comprises the steps of generating a primary frequency modulation action delay signal for a thermal power generating unit according to a corresponding relation between a current target frequency difference value of the thermal power generating unit and an energy storage action dead zone threshold range of a flywheel energy storage system, sending a frequency modulation load instruction corresponding to the target frequency difference value and a primary frequency modulation action delay signal to a flywheel energy storage system, so that the flywheel energy storage system is triggered to respond to a frequency modulation action for charging or discharging, and based on the corresponding relation between the current target load difference value of the thermal power generating unit and the logic judgment threshold value, conducting logic locking processing on the flywheel energy storage system. The method can effectively improve the frequency modulation response speed of the thermal power generating unit, meets the actual requirements of a power grid, can reduce the influence of the action of the energy storage equipment on the AGC performance of the thermal power generating unit, meets the index assessment requirements of the thermal power generating unit, prolongs the service life of the energy storage equipment, improves the performance of the energy storage equipment, and improves the operation economy of the thermal power generating unit and a power plant.

Description

technical field [0001] The present application relates to the technical field of automatic control, in particular to a flywheel energy storage control method and device. Background technique [0002] In some areas, the power structure is dominated by large thermal power units, and the frequency modulation support of the power grid is mainly provided by thermal power units, and the power adjustment actions of thermal power units are frequent. Thermal power units undertake heavy adjustment tasks for a long time, which will cause a series of negative consequences such as serious wear and tear of unit equipment and difficulty in achieving ultra-clean emission targets, which will have a negative impact on the safe and reliable operation of the power system. Some regions have previously pointed out that they should focus on research to improve the frequency regulation performance of generating units in their regions. Since the frequency regulation effect of energy storage system ...

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Problems solved by technology

However, because the unit signal acquisition, transmission and logic operation take a certain amount of time, there is usually a 2-3 second lag in a frequency regulation action, which is difficult to meet the needs of the power grid for rapid response to frequency regulation; at the same time, the frequency regulation performance of the unit is closely related to the operating conditions. Various factors such as deep peak shaving conditions, inflection point of steam turbine valve flow characteristics, and large main steam pressure deviation will cause the frequency regulation performance of the unit to fail to meet the actual needs of the power grid

The primary frequency modulation method of existing thermal power units can also be: the process of energy storage participating in frequency modulation is divided into the frequency modulation stage and the SOC self-recovery stage based on the frequency regulation dead zone of the power grid. Due to frequent network frequency fluctuations, and most of the fluctuations last for a short period of time (less than 15 seconds), the energy storage device responds immediately after the frequency goes out of the dead zone, which will cause frequent actions of the energy storage device, thereby reducing the service life of the device; at the same time, frequent energy storage The action will cause the SOC of the energy storage to be unable to maintain in the ideal state range (0.45-0.55), thereby affecting the performance of the energy storage equipment; in the SOC recovery stage, the automatic generation control AGC (Automatic Generation Control) of the unit may be caused during the charging and discharging process of the energy storage equipment. ) adjustment rate, adjustment accuracy and response time and other indicators are unqualified, resulting in the unit being assessed and affecting the economic benefits of the unit

[0004] That is to say, no matter which of the above-mentioned primary frequency modulation methods of thermal power units, it is impossible to meet the requirements of life, performance and thermal power unit index assessment of energy storage equipment on the basis of ensuring the response speed and reliability of thermal power unit frequency modulation.

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