为深入研究无配套火电支撑的风火打捆特高压直流配套稳控系统控制策略,分析了雁淮直流投运初期送端电网安全稳定特性,研究了近区风电不同接线方式对直流换相失败后风机暂态过电压的影响.提出了综合应对直流近区及山西北部电网潮流转移和电压稳定的切机控制策略,实现了多区域分散可切机组的协调配合,设计了稳控装置配置及实现功能.通过研究雁淮直流送端稳控系统与山西北部交流稳控系统的耦合特性,量化了两套稳控装置相继动作带来的可切容量不足风险,提出不同停机备用水平下雁淮直流预控功率.仿真结果验证了所提策略的有效性与合理性,研究结论可为无配套火电支撑的风火打捆直流外送系统的安全稳定分析及控制策略制定提供参考.%Security and stability characteristics of sending-end grid of Yan-Huai UHVDC is analyzed in detail. The UHVDC system is a wind-thermal-bundled system without support of thermal power generation. The influence of different connection methods on transient voltage of wind generator after one-time commutation failure of Yan-Huai UHVDC is analyzed. Generator tripping control strategy is proposed with consideration of power transfer and voltage stability in areas close to converter station and north Shanxi area. A deployment scheme of stability control devices is designed to realize cooperative control of tripping generators in different areas. Considering different spare levels of generators, pre-control operation powers of Yan-Huai UHVDC are proposed after analyzing coupling characteristic of stability control systems between sending-end system of Yan-Huai UHVDC and North Shanxi. Risk of generator tripping due to insufficient capacity is quantified after success operation of two sets of stability control device. Simulation results and analysis based on real-sized power grid in China prove rationality and effectiveness of proposed control strategies. The simulation and analysis result provides references for stability analysis and control strategy development of the similar sending-end system of UHVDC projects.
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