提高短期频率稳定性的紧急需求响应分散协调控制方法

A Decentralized and Coordinated Control of Emergency Demand Response to Improve Short-term Frequency Stability

短期频率稳定问题是多(特)高压直流馈入受端电网面临的重大安全隐患,紧急需求响应(emergency demand response,EDR)为解决该问题提供了一种思路。针对此前集中式EDR控制依赖高速专网、实现成本高而分散式EDR控制精度低的问题,提出一种多EDR资源的分散协调控制方法,将分散决策与集中决策通过慢速通信互联起来,利用全网惯性中心频率变化率的一致性,解决了无高速专用信道条件下多EDR控制的协同优化问题。在典型受端电网仿真模型上应用该方法,验证了其在馈入直流双极闭锁等场景下提高系统短期频率稳定性的良好控制性能。

Short-term frequency stability is a big threat to the security of receiving-end power systems with multi-infeed(ultra)HVDCs.The emergency demand response(EDR)offers a potential to address this issue.However,the centralized EDR control is heavily dependent on high-speed communication and thus expensive;while the previously developed decentralized EDR control has inferior accuracy.This paper proposed a novel decentralized and coordinated EDR control,which integrates decentralized and centralized decision-making strategies through slow communication infrastructure.The consistency in rate of change of frequency measured at difference buses was employed to achieve coordinated optimization of multiple EDRs without real-time information exchange.The performance of the proposed control has been verified with time-domain simulations on a typical receiving-end power system.