灵绍±800 kV特高压直流协调频率控制功能应用

区域电网频率控制系统在应对多直流馈入引发电网频率稳定问题中发挥着重要作用,频率控制系统动作的快速性、准确性很大程度依赖于直流协调控制功能。介绍了直流控制系统与频率控制系统的接口方式,设计了合理的接口数据处理方法。针对频率控制系统存在无法准确判别直流功率回降量的问题,提出了直流功率损失判断准确性提升方法。为改善直流执行频率控制系统调制命令的准确性和可靠性,提出了调制功率补偿方法和换相失败延时调制方法。最后通过实时数字仿真(RTDS)验证了所提方法的正确性和有效性,为后续特高压直流协调控制功能的应用提供了参考。

Application of Coordinated Frequency Control Function in Lingshao ±800 kV UHVDC Project

The frequency emergency coordination control system plays an important role in dealing with the frequency stability problem of power systems caused by multi-infeed HVDC systems.However,the rapidity and accuracy of the coordinated control system largely depends on the DC coordinated control function.Firstly this paper introduced the interface between DC control system and coordinated control system,and interface data processing method was appropriately designed.Then a new DC power fast decreasing control method was proposed to solve the problem that the coordinated control system cannot distinguish the decrease of DC power under the current control method.A modulation power compensation method and a commutation failure delay modulation method were also proposed to improve the accuracy and reliability during the implementation of modulation control.Finally,the correctness of the functions was verified by RTDS simulation test,which provides reference for the application of the UHVDC coordinated control function.