考虑同步调相机无功特性的多馈入直流同时换相失败风险评估方法

针对加装同步调相机后多馈入直流输电系统同时换相失败问题,提出一种考虑同步调相机无功电压特性的风险评估方法。分析同步调相机、直流系统和静态无功补偿装置的无功电压特性,并推导出多馈入交互因子(multi-infeed interaction factor, MIIF)计算公式。根据换相失败本质定义换相失败评估因子(commutation failure estimate factor, CFEF),并基于CFEF提出含同步调相机的多馈入直流系统同时换相失败风险评估方法。以山东电网为例进行验证,结果表明所提方法能够准确、有效评估多馈入直流输电系统同时换相失败,并且在直流输电系统前期规划、保证交直流系统安全稳定运行等方面具有重要价值。

Multi-infeed HVDC simultaneous commutation failure risk evaluation method considering synchronous condenser reactive power

In order to improve the "Strong alternating current and weak direct current" characteristics of multi-infeed high voltage direct current systems, the synchronous condenser gradually gained attention.For the problem of multi-infeed high voltage direct current with synchronous condenser simultaneous commutation failure, a risk evaluation method considering the synchronous condenser reactive voltage characteristics was proposed. Firstly, the reactive voltage characteristics of the synchronous condenser were analyzed, and the multi-infeed interaction factor was calculated by reactive voltage sensitivity of the synchronous condenser, high voltage direct current system and static reactive power compensation device. Then, based on the nature of the commutation failure, the commutation failure evaluation factor was defined, and the simultaneous commutation failure risk of the multi-infeed high voltage direct current system with synchronous condenser was evaluated. Finally, the Shandong power grid was taken as an example to verify the results that the proposed method could effectively evaluate the multi-infeed high voltage direct current simultaneous commutation failure, and it was important in the early planning of the high voltage direct current transmission system and ensuring the stability and security of the power system.