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Flexible operations in modern power system require more frequent control mode switching for FACTS, HVDC and renewable power generation. Proportional-Integral (PI) controller serves as a fundamental component in the control system of mainstream power electronic devices. It is found that improper initialization of power electronic devices would cause mismatch between the control system state and actual system state. Subsequently, the “control disturbance” will be introduced to power systems and this may cause system oscillations and even affect system stability. This paper proposes a novel control system initialization strategy of power electronic devices to realize fast and accurate matching of actual system state: (a) Mechanism of “control disturbance” is theoretically analyzed; (b) Principle of eliminating control disturbance is summarized into two rules, where the mathematical relationship between the integrator output variable values of PI controllers and the actual system state is derived for the proposed initialization strategy; (c) The proposed control strategy can be applied to different types of power electronic devices with PI controllers in the control system, taking VSC-HVDC and STATCOM as representative application cases. Simulations in PSCAD/EMTDC software and experimental studies are executed to verify the effectiveness of the proposed initialization strategy.
Li et al. (Wed,) studied this question.