In this paper, the structure, coordinate control method, and parameter design of a hybrid system are proposed for active power injection and nonactive power (reactive, harmonic, and unbalance power) compensation. The proposed hybrid system consists of a static var compensator (SVC) in parallel with a capacitive-coupling grid-connected inverter (CGCI) (SVC//CGCI). In SVC//CGCI, the SVC part is used to dynamic compensate the reactive power and unbalance power, while the low rating CGCI part is used to inject active power, provide harmonic power and a fixed amount of capacitive reactive power. Compared with conventional inductive-coupling grid-connected inverter (IGCI), the CGCI can provide active, reactive and harmonic power with low rating of active inverter part. The cost of the SVC part is much lower than that of active inverter part, thus the reduction of inverter rating can lead to a decrease in the total cost of the SVC//CGCI. Therefore, the SVC//CGCI can be a cost effective solution for active power injection and nonactive power compensation. Finally, simulation and experimental results are provided to show the advantages and validity of the proposed SVC//CGCI in compared with the conventional IGCI and SVC//IGCI.

中文翻译：

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用于有功功率注入和无功功率补偿的 SVC 和电容并网逆变器 (SVC//CGCI) 的多功能混合结构

本文针对有功功率注入和无功功率（无功、谐波和不平衡功率）补偿提出了混合系统的结构、协调控制方法和参数设计。所提出的混合系统由一个静态无功补偿器 (SVC) 与一个电容耦合并网逆变器 (CGCI) (SVC//CGCI) 并联组成。在 SVC//CGCI 中，SVC 部分用于动态补偿无功功率和不平衡功率，而低额定值 CGCI 部分用于注入有功功率，提供谐波功率和固定量的容性无功功率。与传统的电感耦合并网逆变器（IGCI）相比，CGCI 可以提供有功、无功和谐波功率，并且有源逆变器部分的额定值较低。SVC部分的成本远低于有源逆变部分，因此，逆变器额定值的降低可以导致 SVC//CGCI 总成本的降低。因此，SVC//CGCI 可以成为有功功率注入和无功功率补偿的经济高效的解决方案。最后，提供了仿真和实验结果，以表明所提出的 SVC//CGCI 与传统 IGCI 和 SVC//IGCI 相比的优势和有效性。