Abstract
An integrated scheme of emergency DC power support which is based on dominant center of Inertia DCOI is proposed to improve power system transient stability. The inter-area speed differences equivalent by dominant center of inertia alleviates the main weakness of the traditional signal which is made of the frequencies at both sides and is represent of abnormal information of the nonlinear dynamic behavior of the power system based on a model in which two AC systems are connected by a HVDC Link. Sichuan Power Grid connected with Southwest Power Grid by Deyang-Baoji HVDC project is used to testify the method. The simulation results show that the control strategy can significantly advance the transient stability of AC/DC system through extended equal area criterion (EEAC).
Highlights
The main appeal of HVDC (High Voltage Direct Current) with long-distance and large capacity competence for power transmission is the prominent ability to regulate reactive and active power
An integrated scheme of emergency DC power support which is based on dominant center of Inertia DCOI is proposed to improve power system transient stability
The inter-area speed differences equivalent by dominant center of inertia alleviates the main weakness of the traditional signal which is made of the frequencies at both sides and is represent of abnormal information of the nonlinear dynamic behavior of the power system based on a model in which two AC systems are connected by a HVDC Link
Summary
The main appeal of HVDC (High Voltage Direct Current) with long-distance and large capacity competence for power transmission is the prominent ability to regulate reactive and active power. The inter-area speed differences equivalent by dominant center of inertia can effectively reflect the abnormal information of the nonlinear dynamic behavior of the power system based on a model in which two AC systems are connected by a HVDC link. It is as the controller input signal [3,4,5,6]. An emergency DC power support comprehensive strategy is devised by combining DC power lift / drop-back with the dominant center of inertia speed deviation signal to modify the power set value jointly. Taking Sichuan power grid for background, it indicates that the signal deriving from the dominant center of inertia is more efficient than the traditional signal made of the frequencies at both sides after comparative analysis of the system characteristics of various operating conditions under typical faults
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