Method used for controlling participation of battery energy storing system in primary frequency modulation and optimization of power gird

Abstract

The invention discloses a method used for controlling participation of a battery energy storing system in primary frequency modulation and optimization of a power gird. The method comprises the following steps: collecting a power grid frequency through a data collecting module and inputting the power grid frequency to a power-frequency conversion control module; taking the lower limit of frequency bias fSQ and upper limit as the control goal in the power-frequency conversion control module, wherein delta fi is more than the lower limit and less than fSQ; and taking meeting the control goal and keeping relatively good charging/discharging ability and excellent system on chip (SOC) level of the battery energy storing system as the control principle, conducting operation treatment on the input data according to a power-frequency conversion control strategy; judging whether the real-time grid frequency bias delta fi exceeds the frequency dead zone; if so, transforming the frequency bias delta fi to a corresponding power bias delta Pi, comparing the obtained power balance delta Pi of the power grid at the moment i with the maximum output limit value PBatt.Max of the battery energy storing system; judging the degree of the battery energy storing system participating in the primary frequency regulation of the power grid; controlling the output of the battery energy storing system by a battery management system (BMS), correcting the balance between supply and demand of the power gird, preventing the aggravation of the frequency fluctuation, and maintaining the stability of the power grid frequency.

Description

technical field [0001] The invention relates to the field of electric power systems, in particular to an optimization control method for a battery energy storage system participating in primary frequency regulation of a power grid. Background technique [0002] The frequency of the power system is an important control parameter for the operation of the power system, 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] (1) In the primary frequency regulation of electric power, the heat storage of the thermal power unit is mainly used to quickly respond to the primary frequency regulation. Therefore, due to the limitation of heat storage, there is a phenomenon that the primary frequency regulation capacity is obviously insufficient, and it is even far from reaching the theoretical primary frequency regulation capacity value; in electric power In the actual operation of...

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