Commutation failure resistance strategy and RTDS verification of hybrid commutation converter
Commutation failure is a unique fault of LCC-HVDC,which is particularly conspicuous in weak AC sys-tems.This paper firstly analyzes the reasons for LCC commutation failure,and then proposes a hybrid commutation converter technology scheme that applies high-power controllable shutdown IGCTs for thyristor replacement.And combined with characteristics of IGCT,active shutdown strategies and implementation methods for HCC are pro-posed,under the conditions of normal commutation and commutation failure resistance.Subsequently,according to the actual HVDC control and protection framework,the primary circuit,CCP and PPR systems of HCC system in the RTDS environment were designed and established,for what only the active shutdown part was added compared to LCC.Finally,a series of experiments were conducted to verify the feasibility and accuracy of the HCC system for resisting commutation failure.
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