抑制风电并网影响的储能系统调峰控制策略设计

大规模风电并网引发调峰问题的本质原因在于风电出力具有不可控性,电池储能系统能够实现对电能的吞吐而被认为是控制风电出力、提高电网接纳风电能力的有效手段。针对风电出力反调峰特性导致系统调峰容量不足的情况,分析了大规模风电接入对负荷低谷时段常规机组出力计划制定的影响机制和储能系统对提高电力系统调峰容量的调控机制,设计了含动作死区参与负荷低谷时段调峰的电池储能系统控制策略。算例分析表明,所设计电池储能系统控制策略可有效减少因风电接入所引发的火电机组启停调峰次数,大大提高电网运行的经济性。

Design of Control Strategies of Energy Storage for Peak Shaving to Restrain Wind Power’s Influence on Power Grid

The essential problem of peak shaving of large-scale wind power is uncontrollability of wind power. Because of the ability of charging and discharging, battery energy storage systems are considered as an effective mean to control wind power output and improve the wind power acceptance capability of a grid. Aiming at insufficient peak shaving capacity of power systems caused by anti-peak shaving character istics of wind power output, the influence mechanism of large-scale wind power integration on generation schedules for traditional generators in load valley period and the regulatory mechanism of the participation of energy storage systems in peak shaving were analyzed. Control strategies of the energy storage system that includes dead-zone control were designed in case of low load. Example result shows that control strategies of energy storage system mentioned above is effective to renduce the start-up times of thermal power units when the large-scale wind power is integrated to the grid and the economic benefit of power grid operation is greatly improved.