The nonlinear internal control of STATCOM: theory and application

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• 作者：Liu ; Feng ; Mei ; Shengwei ; Lu ; Qiang ; Ni ; Yixin ; Wu ; Felix F. ; Yokoyama ; Akihiko
• 关键词：Static Synchronous Var Compensator ; Direct Feedback Linearization ; Robust control ; H_&infin ; control
• 刊名：International Journal of Electrical Power and Energy Systems
• 出版年：2003
• 出版时间：July, 2003
• 年：2003
• 卷：25
• 期：6
• 页码：421-430
• 全文大小：532 K

文摘

In this paper, a two-level control structure of Static Synchronous Var Compensator (STATCOM), which consists of internal and external control system, is described. The control targets of two levels and relations between them are also stated. The suggested configuration of control systems can benefit the systemic design for STATCOM controller. H_∞ control approach, which considers imprecise parameters and external disturbances, is applied to design the internal controller of STATCOM. With the proposed internal control, the model of STATCOM can be simplified to be a first-order inertia block, which can significantly simplify the design of system control. After that, some improvements and optimizations based on the dynamical analysis of STATCOM have been developed to achieve better dynamical performance and higher tracking accuracy. Simulations are carried out to verify the performance of the proposed controller comparing with that of the conventional PI controller. The results show that the proposed controller has faster dynamic response, higher accuracy of tracking the reference, and stronger robustness to parameters variation and external disturbances.