计及风电高频保护的送端电网多直流协同频率控制

为解决中国能源与负荷逆向分布问题，大量高压直流输电工程正在建设或已经投运。针对送端电网中可能发生的直流闭锁导致的高频事件，计及风电机组的高频保护约束，研究了进行多回直流协同控制从而抑制电网频率偏移的方法，提出了以各健全直流总功率调制量最小为目标的多直流协同频率控制模型，通过一阶差分近似求解系统最大频率偏移相对于各受控直流功率的灵敏度，优化求解多直流协同频率控制策略。并进一步以某含高比例风电的送端电网为例，验证该方法在送端电网频率控制策略整定中的有效性。

Coordinative Frequency Control of Multi HVDC Links in Sending-End Power Grid Considering Over-Frequency Protection of Wind Power Generation

A large number of high voltage direct current (HVDC) projects are under construction or have been put into operation in order to mitigate the reverse distribution between energy and loads in China. Focusing on the over-frequency scenarios of sending-end power systems causing by HVDC blocking, the coordinative control of multi high voltage direct current (HVDC) links considering over-frequency protection of wind power generators is studied in this paper to control system frequency. A coordinative control model is proposed to minimize the total HVDC modulation amount. The first-order difference is adopted to estimate the sensitivity of the maximum frequency deviation of the system against each controlled DC power, and the optimum coordinative frequency control strategies of multi HVDC links can be obtained. The proposed method is validated in a sending-end power grid model with high wind power penetration rate to show its effectiveness in designing the frequency control strategies of the sending-end power systems.