Abstract
Low-frequency oscillation suppression of the interconnected power grid is an important factor for the stable operation of the power system. In this paper, the AC-DC interconnected power system is represented as the switched Hamilton system based on the centre of inertia (COI) equivalent method. The Hamilton energy function of the system is constructed from the viewpoint of the oscillation energy of the interconnected power system, which is then used as a uniform Lyapunov function to study the stabilization problem of the system. Then the high voltage direct current (HVDC) supplementary damping controller is designed aiming to reduce the oscillation energy thus the suppression of the oscillation is attained. The proposed control design procedure is fully based on nonlinear theory and can be widely used for practical power system with changing operation conditions. The feasibility of the proposed controller in the practical power system is discussed based on wide-area measurement system (WAMS). The simulation results of the EPRI 7 nodes system verify the correctness and effectiveness of the proposed method. DOI: http://dx.doi.org/10.5755/j01.eee.20.4.4230
Highlights
Energy flow and balance are important factors for power system operation security and stability [1]
A supplementary high voltage direct current (HVDC) damping control strategy based on Hamiltonian energy theory and online measurement simplification is presented
The equivalent model of the AC/DC parallel power system is obtained using the centre of inertia (COI) equivalent method, in which the equivalent parameters are updated based on the real time measurement data from wide-area measurement system (WAMS)
Summary
Energy (or power) flow and balance are important factors for power system operation security and stability [1]. With the rapid development of power grid construction, the AC/DC parallel transmission line connecting two regional power grids are becoming more and more common, especially in the developing countries, such as India, Brazil and China Speaking, this hybrid transmission structure originates from the expansion of the DC transmission line based on the existing AC transmission corridor with the growth of the load, such as the pacific intertie HVDC in America and the CSPG in China. The structure of the system satisfies the condition of (7), the control design method shown in Theorem 1 can be extended to the HVDC supplementary damping control design which will be discussed in the sequel
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