Modelling And Control of Pumped Storage Based Renewable Integrated Power System For Small Signal Stability Enhancement

Abstract

In the power sector so many blackouts have been reported due to low-frequency oscillations, which has become a challenge to a power system operator. Due to this, low frequency oscillation and its damping has been put into the grid code of different manuals of grid operation and control. Malfunctioning of a controller is truly responsible for low frequency oscillations in generating plant. If these small signal oscillations are not damped properly, they may eventually give rise to sacrifice of synchronism. Optimal settings of controller parameters are a challenging decisive approach to reduce errors in power system and improving stability. Subject to increasing penetrations of renewable sources like Solar-photo-voltaic (SPV) and wind energy sources, power system oscillation damping is going to be a critical challenge for system operators. Also, pumped storage hydropower system (PSHS) is going to take important role for energy storage and management with varying renewable penetrations, but their governors need to be utilized efficiently for power oscillation damping. An important issue is selection of appropriate controller for oscillation damping. Conventional PSHS (CPSHS) based control action may not be adequate to provide sufficient damping torque to oscillations. So PSHS based control action can be coordinated with Power-system-stabilizer (PSS) or Flexible AC Transmission System (FACTS) based controller. In the present work different coordinated control actions are implemented to provide required damping torque by PSHS governor with PSS and FACTS. At first a dual lead-lag compensated governor (DCG) of CPSHS has been coordinated with PSS and analyzed with different case studies where hybridized modified differential evolution and particle swam optimization (MDEPSO) algorithm has been applied to tune controller gains. Then The CPSHS based controller has been modified with 2 degree of freedom-proportional Integral (2DOF-PI) control action and coordinated with Proportional integral derivative- lead-lag (PID-LL) bas