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介绍了用于不平衡负荷补偿的三相三角形连接的配电网静止同步补偿器(D-STATCOM)中补偿电流的3种设计方案,即电纳补偿原理、最大相电流最小化设计和无零序设计方案。从所需的最大补偿相电流和补偿电流零序分量等性能指标和工程意义与实现要求等方面对3种设计方案进行了比较。在负荷严重不平衡的情况下,补偿装置三相分担的负荷不均衡会限制装置的补偿能力,也容易导致一相或两相过流。最大相电流最小化设计,可以尽量实现三相电流大小均衡,从而提高设备利用率,扩大不平衡负荷补偿范围。无零序设计方案的效果与最大相电流最小化设计方案接近。
Three kinds of design schemes of compensation current in D-STATCOM for three-phase delta connection for unbalanced load compensation are introduced, namely, the principle of susceptance compensation, the minimization of maximum phase current and the design of zero-offset Order design. The three kinds of design schemes are compared from the performance indexes such as the maximum compensation phase current, the zero sequence component of compensation current, the engineering significance and the realization requirements. In the case of a heavy load imbalance, unbalanced loads shared by the three phases of the compensation device may limit the compensation capability of the device and easily lead to overcurrent in one or two phases. Maximum phase current minimum design, you can try to achieve the size of three-phase current balance, thereby increasing equipment utilization, expanding the range of unbalanced load compensation. The effect of zero-sequence design approach is close to that of minimization of maximum phase current.