适应风电接入的异步联网高压直流输电系统自适应调频控制策略

大规模风电接入高压直流送端系统将导致系统惯量降低，送端系统调频能力不足。为充分挖掘直流和风电协同调频的潜力，提高含风电高压直流送端系统的调频性能，提出一种基于频率轨迹规划的异步联网高压直流输电系统自适应调频控制策略。分析了含风电高压直流送端系统的频率控制特性；综合考虑风电主动频率支撑和直流辅助频率控制，以频率偏差和频率变化率为量化指标，生成参考频率轨迹；在此基础上，对频率轨迹进行区域划分，以参考频率轨迹为基准，实现高压直流输电对送端系统频率的自适应调节。基于MATLAB/Simulink平台搭建改进的两区域4机模型进行仿真分析，验证了所提策略的有效性和优越性。

Adaptive frequency modulation control strategy for asynchronous connected HVDC transmission system adapted to wind power access

The large-scale wind power connection to the high voltage direct current(HVDC) sending-end system leads to the reduction of system inertia and the lack of frequency modulation capacity of the sending-end system. In order to fully tap the potential of cooperative frequency modulation of HVDC and wind power and improve the frequency modulation performance of HVDC sending-end system with wind power, an adaptive frequency modulation control strategy for asynchronous connected HVDC transmission system based on frequency trajectory planning is proposed. The frequency control characteristics of the HVDC trans-mission system with wind power are analyzed. The active frequency support of wind power and DC auxiliary frequency control are comprehensively considered, and the reference frequency trajectory is generated by taking the frequency deviation and frequency change rate as the quantitative index. On this basis, by dividing the frequency trajectory into regions and taking the reference frequency trajectory as the benchmark, the adaptive adjustment of HVDC transmission to the sending-end system frequency is realized. Based on the MATLAB/Simulink platform, an improved two-area four-machine model is built for simulation analysis to verify the effectiveness and superiority of the proposed strategy.