电池储能协同火电机组参与系统调频控制策略研究

Research on battery energy storage in cooperation with thermal power units to participate in system frequency regulation control strategy

随着风、光等可再生能源并网规模增大,其波动性和不确定性严重影响着电网频率的稳定。该文提出利用储能电池协同火电机组共同参与电网系统调频控制策略。在电池储能层面,提出了基于logistic函数的下垂控制和基于piecewise函数的虚拟惯性控制两种调频方法,有效改善储能电池参与系统调频的性能。在储能系统层面,构建电池储能系统协同火电机组参与系统调频的控制框架,以期提高包括储能在内的新型电力系统稳定性。算例结果表明,在电池储能的辅助下,电池储能在电网系统频率波动初期能够快速响应系统频率变化,有效提高系统频率响应能力和电力系统稳定性。

With the increase of the grid-connected scale of renewable energy such as wind and photovoltaic,its volatility and uncertainty seriously affect the stability of the grid frequency.This paper proposes the use of battery energy storage to participate in the grid system frequency control strategy together with thermal power units.At the level of battery energy storage,the droop control based on logistic function and virtual inertia control based on piecewise function are proposed for battery energy storage frequency regulation,which effectively improves the performance of battery energy storage participating in system frequency regulation.At the level of energy storage systems,to build a control framework for the battery storage system to participate in system frequency regulation in collaboration with thermal power units,with a view to improving the stability of the new power system including energy storage.The calculation example results show that with the assistance of battery energy storage,battery energy storage can quickly respond to system frequency changes in the early stage of grid system frequency fluctuations,which effectively improving system frequency response capability and power system stability.