高压直流输电系统中,换流器是最为重要的元件之一,换流器的特性直接决定了高压直流输电系统的性能。在与换流器相关的诸多问题中,换流器的换相问题重要而突出。触发滞后角α与换流器的换相过程具有紧密的联系,详细地研究触发滞后角与换相时间的关系具有十分重要的意义。因此,分析了触发滞后角口与换相角∥的关系,求解得到了最短换相时间μmin。及对应的触发滞后角αμmin。,求得了最大触发滞后角αmax,指明了触发滞后角α的取值范围。分析证明了换相角μ与触发滞后角口在不同取值范围时的单调关系。
The converter is one of the most important components in HVDC. The characteristic of the converter affects the performance of HVDC directly. The commutation of the converter is outstanding among various problems related to the converter. There is an intimate connection between trigger-delayed angle α and the commutation process of the converter. It has very important significance to study the relationship between trigger-delayed angle and commutation time in detail. Therefore, the relationship between trigger-delayed angle a and overlap angle μ is analyzed. The minimum commutation time μmin, and the corresponding trigger-delayed angle αμmin are obtained. Meanwhile the maximum trigger-delayed angle αmax is also gained. The range of trigger-delayed angle α is indicated. The relationship between overlap angle μ and trigger-delayed angle α in the case of various values is discussed and proved.