考虑风功率特性的双馈风机无功补偿容量计算

Calculation of Reactive Power Compensation Capacity of DFIG Considering the Wind Power Characteristics

风电场并入电网时会引起系统无功变化,从而影响系统电压稳定。常规的风电场无功补偿主要针对风电场设备的无功损耗,忽略了风机本身的无功发生能力。通过分析双馈风机的无功特性以及各补偿设备的特点,提出结合双馈风机风功率特性的无功补偿容量计算方法,并使用风电场发电量引起的母线电压波动是否超过电网允许值作为无功补偿设备选型依据,解决常规方法存在的过补偿问题,最后结合具体算例,验证了方法的有效性。

The integration of wind farms into the grid causes changes of the system reactive power and affects the system voltage stability.Conventional reactive power compensation of wind farm is mainly for reactive power loss of the wind farm equipment,and ignores reactive generation capability of wind turbine.By analyz-ing the reactive properties of DFIG and the characteristics of compensation devices,the paper proposes a calculation method of reactive power compensation capacity of DFIG considering wind power characteristics;whether the bus voltage fluctuations caused by wind farm exceeds the allowable value or not is taken as basis for reactive power compensation device selection to handle overcompensation caused by conventional meth-ods.At last,the method is verified by specific examples.