Damping of low-frequency oscillation in power systems using hybrid renewable energy power plants

Abstract

Global warming, increase in environmental pollution, and high cost of electrical power generation usingfossil fuels are considered the most important reasons for the application of renewable energy power plants (REPPs)around the world. In recent years, a new generation of REPPs called hybrid renewable energy power plants (HREPPs)has been implemented in order to have higher efficiency and reliability than conventional REPPs such as wind powerplants and photovoltaic power plants. The HREPPs include two or more renewable energy generation units such aswind turbine generation units, and PV generation units. In case of high penetration of these types of power plants,the most common tasks of synchronous generators should be supported by them. One of these tasks is the ability toreduce the low-frequency oscillation (LFO) risk through power oscillation damper such as the power system stabilizersof synchronous generators. In this paper, a novel method is proposed for LFO damping by HREPPs, which is based onthe design of an optimal power oscillation damper (OPOD) implemented in the generic HREPP controller model. Thestructure of the proposed OPOD is a 2nd-order single-input lead-lag controller, and its performance is investigated in amodified two-area test system. The simulation results show the proper performance of the HREPP for LFO dampingusing the proposed OPOD in the various loading levels and different short circuit ratio values.