单相断路器跳闸对逆变器换相的影响

若直流受端单回交流线路单相高阻接地时逆变器未发生换相失败,此时单相断路器跳闸可能导致换相失败。首先利用对称分量法推导建立了单相断路器跳闸后的换流母线电压表达式,基于表达式分析了影响换流母线电压的主要因素,发现其与系统等效参数相关。随后研究了换流母线电压偏移角对关断角的影响机理,发现单相断路器跳闸后换流母线电压过零点前移是导致关断角减小的主要因素,严重时会诱发换相失败。最后在PSCAD/EMTDC电磁暂态仿真软件平台搭建交直流仿真模型,仿真验证了受端单回线单相断路器跳闸对逆变器换相过程的影响,仿真结果与理论分析相吻合。

Influence of single-phase circuit breaker tripping on inverter commutation

If commutation failure does not occur when single-phase high resistance grounded in single-circuit AC line of inverter,then single-phase circuit breaker tripping may lead to commutation failure. Firstly,the expression of converter bus voltage after single-phase circuit breaker trip is derived by using symmetrical component method. Based on the expression,the main factors affecting the converter bus voltage are analyzed,and it is found that it is related to the equivalent parameters of the system. Then,the influence mechanism of voltage deviation angle of commutator bus on extinction angle is studied. It is found that the zero-crossing forward angle of commutation bus voltage after the single-phase breaker trips is the main factor leading to the decrease of the extinction angle,and commutation failure will be induced in serious cases. Finally,the AC/DC simulation model was built on the PSCAD/EMTDC electromagnetic transient simulation software platform. The simulation verifies the effect of the tripping of single-phase breaker in single-circuit AC line on the commutation process of inverter. The simulation results are consistent with the theoretical analysis.