基于可变系数的风电机组一次调频策略

Primary Frequency Regulation Strategy of Wind Turbine Based on Variable Coefficient

传统综合惯性控制因采用固定系数,不能根据风电机组自身运行状态改变参数参与系统调频。针对该问题,提出了基于可变系数的风电机组一次调频策略。推导分析了虚拟惯性系数和下垂系数,用单一下垂调频回路取代传统的双调频回路,同时引入虚拟惯性系数和下垂系数,设计了一个与频率变化率相关联的函数,进一步整定可变系数。仿真结果表明,所提策略能够根据风电机组运行状态调节自身的调频能力,提高机组调频的灵活性和可靠性。

Traditional integrated inertial control adopts fixed coefficients and cannot change the frequency modulation ability of the participating system according to the operating status of the wind turbine.To solve this problem,a wind turbine primary frequency regulation strategy based on variable coefficients is proposed.The virtual inertia coefficient and droop coefficient are deduced and analyzed,and the traditional dual frequency modulation loop is replaced with a single droop frequency modulation loop.At the same time,the virtual inertia coefficient and the droop coefficient are introduced,and a function related to the frequency change rate is proposed to adjust the variable coefficient.The simulation results revealed the proposed strategy can adjust the frequency adjustment ability on the base of the operating status of the wind turbine,and enhance the agility and reliability of the frequency adjustment of the wind turbine.