D-STATCOM不平衡负荷补偿电流的3种设计方案

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 Design Schemes of Compensation Currents for D-STATCOM Used for Unbalanced Load

Three design schemes of compensation currents for D-STATCOM in delta connection used for unbalanced load compensation are introduced. They are the schemes based on compensation principle of admittance, no zero sequence component design and an optional design method of maximum minimizing phase current. Comparisons are made considering technical indexes and engineering significance among the proposed three schemes. In serious unbalanced operating conditions, the obvious difference in amplitude among the compensation currents in three phases may lead to one or two phase overloading and the compensation capability is restricted. The optional design makes the compensation currents in three phases to be equal or close to each other as possible as it can, which is helpful to ensure the D-STATCOM having high usage and desirable compensation effect. Similar performance can be obtained to some extent with the simpler scheme of no zero sequence component design.