RETRACTED: Design nonlinear robust damping controller for static synchronous series compensator based on objective holographic feedback–H∞

Cheng Liu,Deyou Yang,Guowei Cai

doi:10.1177/1687814016655681

Abstract

Considering the strong nonlinearity of power oscillation in power system containing static synchronous series compensator and nonlinear factors, a novel power oscillation damping controller that exhibits nonlinearity and robustness is proposed to reduce power oscillation in such systems. First, use objective holographic feedback on the system state equation to obtain system model. Second, nonlinear factors and external disturbances are estimated using direct feedback linearization to achieve linearization of the nonlinear model. Third, HN equation should be selected. Finally, a power oscillation damping controller of static synchronous series compensator is designed on direct feedback linearization, objective holographic feedback theory–HN. The controller exhibits good dynamic performance and robustness. Simulations on four-generator two-area system are conducted under various disturbances to prove the effectiveness and robustness of the proposed damping control method.

Highlights

Power oscillation is a common phenomenon as power system suffers from various disturbances
Additional devices can be divided into two categories: (1) power system stabilizer (PSS) is used in the excitation system[3] and (2) flexible AC transmission system (FACTS) devices are used in line.[4,5,6,7]
A nonlinear power oscillation damping (POD) controller of synchronous series compensator (SSSC) is introduced in this article, which is designed by combining the advantages of objective holographic feedback (OHF) and HN theory (OHFH) to reduce power oscillation

Summary

Introduction

Power oscillation is a common phenomenon as power system suffers from various disturbances. Most methods are based on determination model and linear control theory, in which the nonlinear equations are linearized at a specific equilibrium. Such as traditional damping controller of SSSC is designed based on proportional–integral (PI) control,[9,10,11,12] and its structure is simple and easy to apply. It can consider the uncertainty of the model and parameter It can have good damping control effect on power grid including SSSC. In section ‘‘Simulation results and discussion,’’ the effectiveness and robustness of wide-area control method for damping oscillation are verified via test systems. The conclusions of the study are provided in section ‘‘Conclusion.’’

Design principles of OHFH

Conclusion