考虑系统频率二次跌落的风电机组辅助调频参数确定方法

Parameter Setting of Auxiliary Frequency Regulation of Wind Turbines Considering Secondary Frequency Drop

随着以变流器接口并网的新能源比例不断提高,电力系统一次调频能力降低,频率稳定受到威胁。风电机组通过在并网变流器附加综合惯性控制实现辅助调频。然而,风电机组提供频率响应后,转子转速恢复可能给电力系统带来频率二次跌落危害。现有辅助调频参数设置多从风力机组自身调节能力出发,缺少考虑与系统的耦合作用。首先研究风电机组调频控制参数对系统一次调频的影响机理,分析参数整定的制约因素,然后根据一次调频综合评价指标来确定参数的取值范围。最后,设置了不同风电出力占比的仿真场景,探究参数在不同风电出力占比下的取值规律。

With increase of renewable energy integrated into power grids via converter interface,the primary control ability of power system decreases,resulting in high risk of frequency instability.Wind generators could provide auxiliary frequency regulation by applying inertial control on the converter.However,after such frequency regulation,the wind generator must recover its rotor speed,possibly causing secondary frequency drop.In existing researches,auxiliary frequency regulation parameters are set mostly based on wind generator capability,lacking correlation consideration about power system.This paper studies the impact of such parameters on primary frequency dynamics,analyzes setting restrictions,and then determines the feasible range of these parameters according to primary frequency evaluation indices.Finally,scenarios with different wind power ratios are set,discovering the regular pattern of parameter setting.