多级注入式电流源型STATCOM模型和非线性控制策略研究

Multi-level reinjection current source converter STATCOM modeling and nonlinear control strategy

提出一种特别适合应用在大功率应用场合下的新型电流源型多级注入式STATCOM拓扑结构,巧妙地利用了注入式控制技术、多电平技术和零电平技术能够使主桥开关在基频下工作产生可控的连续交流输出电流,输出高质量的电流波形,同时交流侧不需要连接电容就可以较好解决常规电流源变换器吸收电容难题。推导出多级注入式电流源型STATCOM的数学模型。给出了STATCOM仿射性状态方程采用反馈控制线性化设计控制器方法,设计非线性控制转换为采用线性化状态方程来设计。利用PSCAD/EMTDC对所建立的多级注入式CSC-STATCOM模型进行仿真并给出具体结论。

This paper presents a novel MLCR-CSC-STATCOM topology, particularly suitable for the high power applications. Injection control technology, multi-level technology and zero level technology are used, which enables main bridge switch working in fundamental frequency to output continuous controllable AC current and high-quality current waveforms and meantime better resolve the absorption capacitance problems of conventional CSC without installing AC capacitor. This paper derives the mathematical model of MLCR-CSC-STATCOM, adopts feedback control linearization means for the affine CSC-STATCOM equations and replaces the nonlinear control design with linear state equation design. By use of PSCAD/EMTDC tools, the established model of MLCR-CSC STATCOM is simulated and some specific conclusions are drawn.