海上风机与VSC–HVDC协同调频控制策略

Collaborative Frequency Control Strategy of Offshore Wind Turbine and VSC-HVDC

由于海上风电场惯性低,影响系统安全稳定运行,通过类比同步电机的转子运动方程,在受端换流站控制策略中设计了直流电容惯性控制;又由于风机侧与电网侧距离甚远,无法及时对电网频率波动做出响应,通过寻找电网频率与受端换流站直流电压的数学关系,将海上风机与电网耦合,在风机的控制中引入一次调频控制,使风电场能够及时对电网频率的变化做出响应和调节,增强海上风力发电场并网时的有功功率和频率稳定性。

Due to the low inertia of offshore wind farms,which affects the safe and stable operation of the system,DC capacitor inertia control is designed in the control strategy of the receiving end converter station by analogy with the rotor motion equation of synchronous motors;due to the long distance between the wind turbine side and the grid side,it is difficult to respond tofluctuations in the grid frequency in a timely manner.byfinding the mathematical relationship between the grid frequency and the DC voltage of the receiving converter station,the offshore wind turbine is coupled with the grid,and a frequency regulation control is introduced in the control of the wind turbine,so that the wind power plant can respond and adjust to changes in the grid frequency in a timely manner,enhancing the active power and frequency stability of the offshore wind power plant when connected to the grid.