新一代调相机与电力电子无功补偿装置在特高压交直流电网中应用的比较

Comparison of New Generation Synchronous Condenser and Power Electronic Reactive-Power Compensation Devices in Application in UHV DC/AC Grid

针对特高压交直流混联电网建设过渡期呈现出的新特性与稳定运行风险,该文以特高压直流接入对近区动态无功的实际需求为导向,从运行原理、响应特性及应用实例仿真等多个角度出发,比较了新一代大容量调相机与目前电网中应用较多的SVC、STATCOM一类基于电力电子技术的动态无功补偿装置之间的差异。对比分析的结果表明,新一代调相机具有更强的动态无功支撑能力与暂态电压调节能力,更适合于我国当前特高压直流工程输送容量大、送端短路容量不足、受端多回直流集中馈入下电压支撑能力不足的电网结构特点。

Operation of State Grid of China now faces some risks caused by new characteristics appearing during construction of UHV DC/AC Grid. Demand of dynamic reactive power support, especially on both sides of large-scale UHVDC systems, becomes urgent. In response to operational demand, dynamic reactive power compensation techniques such as synchronous condenser, SVC and STATCOM are seriously compared from aspects of basic operating principle, response characteristics, simulation case study, etc. Results show that new generation of synchronous condenser has advantages in dynamic reactive power support and transient voltage regulation, more suitable for dynamic voltage control on both sides of UHVDC systems.