BATTERY ENERGY STORAGE FOR LOAD FREQUENCY CONTROL OF AN INTERCONNECTED POWER SYSTEM

Abstract

This Project report highlights the Control performance analysis of three areainterconnected system and load frequency control of an interconnected reheat thermal system considering battery energy storage (BES) system. In this paper, a comprehensive study on dynamic system performance of three area interconnected power systems when subjected to small load perturbations is carried out. For the present study, three power system models are identified. To investigate the system dynamic performance integral control strategy are implemented in the wake of 1% step load disturbance. The three area-interconnected systems are simulated and studied through Matlab’s Simulink software. In the following study, performance of AGC for thermal, hydro and gas based power systems are examined by the application of integral controller. In the present work one alternative to improve the performance of LFC is the introduction of storage facilities during peak load period and especially battery energy storage (BES) facility Since BES can provide fast active power compensation, it also can be used to improve the performance of load frequency control. Battery energy storage system will operate in discharging mode during peak load period and will be in charging mode during off peak hours. Therefore, only discharging mode behavior of BES is examined on LFC loop. Area control error (ACE) is used for the control of BES system. Time domain simulations are used to study the performance of the power system and BES system. Results reveal that BES meets sudden requirements of real power load and very effective in reducing the peak deviations of frequency and tie-power and also reduces the steady State values of time error and inadvertent interchange accumulations.