Nonlinear Decoupling Control of Two-Terminal MMC-HVDC Based on Feedback Linearization

作     者：Li, Zheng Hao, Quanrui Gao, Feng Wu, Linlin Guan, Minyuan 

作者机构：Shandong Univ Dept Elect Engn Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250061 Shandong Peoples R China State Grid Jibei Elect Power Res Inst Beijing 100045 Peoples R China Huzhou Power Supply Co State Grid Huzhou 313000 Peoples R China 

出 版 物：《IEEE TRANSACTIONS ON POWER DELIVERY》 (IEEE动力传输)

年 卷 期：2019年第34卷第1期

页      面：376-386页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 

基　　金：National Key R&D Program of China [2018YFB0905800] 

主　　题：Modular multilevel converter nonlinear control feedback linearization zero dynamics stability decoupling control 

摘      要：The traditional proportional-integral control for a modular multilevel converter (MMC) design based on a two-level voltage source converter does not consider the dynamics of arm circulating currents and sub-module capacitor voltages, which will lead to the incomplete decoupling between powers and circulating currents for an MMC. In view of this, a nonlinear decoupling control strategy, which applies for two scenarios, e.g., active/reactive power control for a power controlled station (PCS) and dc voltage/reactive power control for a dc-voltage controlled station (DVCS), is proposed for an MMC station based on feedback linearization. First, the nonlinear feedback laws for PCS and DVCS are derived based on the nonlinear equations of an MMC. Next, the complete nonlinear decoupling control strategies for PCS and DVCS are developed. Following that, the zero dynamics stabilities of the two control schemes for PCS and DVCS are investigated. In addition, the method to design parameters of the outer linear controller is also proposed to satisfy the requirement of dynamic performance. Taking a two-terminal MMC-HVDC for example, the simulation in Simulink validates the good transient performance of the proposed nonlinear control, and its robustness is also validated against the changing of system parameters.