A Research on Optimal Damping Parameter Design Method for CURESYM using Eigenvalue Analysis

Abstract

The paradigm of the power system is changing acording to political and environmental factors. Renewable energy sources are going to replace the position of synchronous generators. However, renewable energy sources interfaced with power electronics converters, such as wind turbines and solar photovoltaics, cannot provide inertia previously supplied through synchronous generators to the grid. Acordingly, the inertia in the power system is gradualy decreasing, which is a serious threat to the grid frequency stabilty. In order to solve this problem, a technology in which an inverter synthesizes electrical inertia(or caled virtual inertia) has emerged. Among the inertia synthesis technologies, a control method in which an inverter mimics the properties of a synchronous generator is caled a virtual synchronous machine(VSM). In this paper, a new method is proposed to design damping parameters for CURESYM, which is one of the VSM topologies. The proposed design method is based on eigenvalue analysis, and for this purpose, the linearized smal-signal state-space model of CURESYM is also constructed. The characteristics of the CURESYM are also analyzed based on the derived state-space model. The performance of the proposed optimal damping parameters and the acuracy of the smal-signal state-space model is demonstrated through Matlab/Simulink simulation and experiment.