A Coordinated Control Method for Supercapacitor Energy Storage System Participating in Power Primary Frequency Regulation

Abstract

The invention provides a coordination control method capable of enabling a super-capacitor energy storage system to participate in electric power primary frequency modulation, wherein the super-capacitor energy storage system is arranged on the bus side of a generator set which needs cooperation. A decision optimizing module obtains a frequency from a synchronous vector measurement unit, and the frequency deviation is obtained through the difference between the frequency and a 50Hz frequency. If the deviation exceeds a frequency dead band, the same motion instructions are simultaneously sent to a traditional generator set and the super-capacitor energy storage system. When the super-capacitor energy storage system participates in primary frequency modulation, the opportunity motion and the motion depth of the super-capacitor energy storage system are determined through the decision optimizing module according to partition of typical working conditions, the conversion from the frequency deviation to the power is achieved through a power-frequency conversion module, the charging / discharging control of the super-capacitor energy storage system is achieved through a PCS control module, and finally the traditional generator set is assisted in participating in the primary frequency modulation process. According to the coordination control scheme, the transient state performance and the steady-state performance of the primary frequency modulation can be obviously improved, frequent starting of the traditional generator set is reduced, and the power system frequency can be rapidly kept stable.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to a coordinated control method for a supercapacitor energy storage system participating in primary power frequency modulation. Background technique [0002] The frequency of the power system is an important control parameter for the operation of the power system. It reflects the balance between the active power of the power generation and the load, and is closely related to the safety and efficiency of the power equipment of the majority of users and the power generation and supply equipment itself. [0003] The primary frequency regulation of the power system is implemented by the speed regulation system of the prime mover. It responds quickly to system frequency changes and mainly undertakes those fast and small amplitude random load fluctuations. For load mutations under abnormal conditions, primary frequency regulation can play a certain role. Its existence cannot be re...

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Problems solved by technology

[0003] The primary frequency regulation of the power system is implemented by the speed regulation system of the prime mover. It responds quickly to system frequency changes and mainly undertakes those fast and small amplitude random load fluctuations. For load mutations under abnormal conditions, primary frequency regulation can play a certain role. Its existence cannot be replaced; at present, traditional thermal power units and hydroelectric units are mainly used to respond to primary frequency modulation, but due to technical limitations, the primary frequency modulation capacity is obviously insufficient, and it is far from reaching the theoretical primary frequency modulation capacity. value

At the same time, in the actual operation of power primary frequency regulation, it is common for some power plants to lock the frequency regulation function by themselves in order to reduce unit wear and tear. These factors affect the quality of primary frequency regulation

Although primary frequency modulation is an important way to control the system frequency, it cannot be used alone to adjust the system frequency due to the attenuation of its adjustment effect and the difference in adjustment.

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