大容量新型调相机关键技术参数及其优化设计

大容量新型调相机旨在满足特高压直流输电大规模发展带来的强大的系统动态无功需求,因此其电气参数必然不同于以稳态无功补偿为主的传统调相机。本文通过系统分析各电气参数对调相机暂态及次暂态特性的影响,提炼出调相机动态性能优化的关键技术参数和措施,即尽可能降低直轴次暂态电抗X"_d和主变短路电抗X_k,减小直轴开路及短路时间常数T'_(d0)和T'_d,并将励磁系统强励倍数提高至3.5倍。同时对调相机的具体优化设计方案给出了建议。

Key Technical Parameters and Optimal Design of New Types of Large Capacity Synchronous Condenser

As new types of large capacity synchronous condensers are designed to satisfy the strong demand of dynamic reactive power support for power system, which is brought about by large-scale development of the ultra high voltage direct current (UHVDC) transmission, the electrical parameters must be different from the traditional condensers used for steady-state reactive power compensation. Through systematic analysis of the effect of electrical parameters on transient and sub-transient characteristics of synchronous condensers, key technical parameters and measures for optimizing the dynamic performance of synchronous condenser are induced, i.e. reducing the direct axis sub-transient reactance dX ' and the transformer short-circuit reactance kX as far as possible, decreasing the direct axis unload and short circuit time constant of 0dT' and dT' , increasing the ceiling voltage of exciting system to 3.5 times. Meanwhile, specific suggestions for optimal design of synchronous condensers are proposed as well.