电池储能电站主动支撑控制策略及其参与电网调频特性分析

Active Support Control Strategy of Battery Energy Storage Power Stationand its Participation in Frequency Modulation Characteristic Analysis

新能源并网变流器中所含的大量功率电子器件基本无阻尼及惯性,故对系统的频率及电压承载能力提出了更高的要求。分析了多时间尺度下电池储能电站的主动支撑控制策略及其参与电网调频的过程。结果表明,采用基于同步机的三阶模型可改善储能变流器的暂态调压能力,使其具备同步机的励磁控制器及调速控制器的标准特性,大大提升储能电站的调频稳压能力,通过合理设置储能系统参数可满足灵活性要求,提供优秀的阻尼特性及惯量特性,使其成为大型新能源并网的有力工具,协同传统机组进行调频,为整个电网带来更加稳定的频率环境。

A large number of power electronic devices contained in the new energy grid-connected converters are basically free of damping and inertia.So higher requirements are put forward for the frequency and voltage carrying capacity of the system.The study analyzes the active support control strategy of battery energy storage power station and the process of the participation in the frequency modulation of power grid under multi-time scale.The results show that through adopting the three-order model based on synchro,the transient voltage regulation ability of the energy storage converter can be improved,the standard characteristics of the excitation controller and the speed regulation controller of the synchro be qualified,and the frequency regulation and voltage regulation ability of the energy storage power station be greatly improved.By setting the parameters of the energy storage system reasonably,excellent damping and inertia characteristics and a powerful tool for large-scale new energy grid-connection can be provided,and traditional units for frequency modulation be coordinated with,to bring a more stable frequency environment for the entire power grid.