高压直流换流变压器暂态铁心饱和不稳定及抑制

Transient Core Saturation Instability of HVDC Converter Transformer and Its Suppression

高压直流(HVDC)的铁心饱和谐波不稳定按照其激励源可划分为自发铁心饱和谐波不稳定和暂态铁心饱和谐波不稳定两种形式。在分析产生暂态铁心饱和谐波不稳定形成机理的基础上,提出暂态铁心饱和谐波不稳定新抑制措施,即整流侧接入SVC。且以云广特高压孤岛10%功率运行方式,采用PSCAD建立详细的电磁暂态模型,通过时域仿真试验验证了对暂态铁心饱和不稳定形成机理分析的正确性以及所提出整流侧接入SVC抑制暂态铁心饱和不稳定的有效性。

High Voltage Direct Current（HVDC）core saturation harmonic instability can be divided into two forms（spontaneous core saturation instability and transient core saturation instability） in accordance with its excitation.Based on the formation mechanism analysis of transient core saturation instability,this paper proposed the new measures to suppress the instability： to connect SVC to the rectifier side.The time domain simulation experiment took 10% power operation mode of Yun-Guang UHV island,and adopted detailed electro-magnetic transient model.The simulation results verify the correctness of the analyzed formation mechanism of transient core saturation instability and the effectiveness of the proposed access of SVC to rectifier side to suppress transient core saturation instability.