含大规模风电的高压直流送端系统多源协同调频策略

针对含大规模风电的高压直流送端系统异步联网情况下频率易越限问题，提出了一种基于预测模型的多源协同调频策略。分析风电渗透率及高压直流外送功率占比对频率调整的影响，对不同扰动下各种调频措施的协调配合进行探讨。在长时间尺度上考虑高压直流输电的区域控制偏差约束，优化设置风电机组和火电机组的旋转备用容量；在短时间尺度上考虑电力电子器件的快速可控性，动态调整风电机组及高压直流输电的协同调频参数，使系统频率运行在合理水平。将预测模型得到的频率偏差根据大小进行分区，对不同区域采用不同的调频策略，保证送端系统的旋转备用容量合理及频率动态响应指标合规。基于PSCAD/EMTDC平台搭建含风电高压直流送端系统模型，仿真结果验证了所提策略的有效性及准确性。

Multi-source coordinated frequency regulation strategy for HVDC sending system with large-scale wind power

Aiming at the problem that the frequency of asynchronous interconnection HVDC(High Voltage Direct Current) sending system with large-scale wind power is easy to exceed the limit, a multi-source coordinated frequency regulation strategy based on prediction model is proposed. The influence of wind power penetration and HVDC outgoing power ratio on frequency regulation is analyzed, and the coordination of various frequency regulation measures under large disturbances is discussed. Considering the regional control deviation constraints of HVDC power transmission on a long time scale, the rotating reserve capacity of wind turbine and thermal power unit is optimized. Considering the fast controllability of power electronic devices on a short time scale, the frequency regulation parameters of wind turbine and HVDC power transmission are dynamically adjusted to make the system frequency run at a reasonable level. The frequency deviation obtained from the prediction model is divided into different regions according to the size of the region, and different frequency regulation strategies are adopted in different regions to ensure that the rotating reserve capacity of the sending system is reasonable and the frequency dynamic response index is compliant. The simulation model of the HVDC sending system with wind power is built on PSCAD/EMTDC platform. The simulative results verify the effectiveness and accuracy of the proposed strategy.