IMPACT OF BATTERY STORAGE SYSTEM ON VOLTAGE CONTROL IN DISTRIBUTION SYSTEM

Abstract

In the past few years there has been some serious concerns regarding climate change and its adverse effects can be observed in day today’s life. Due to this, the use of renewable sources of energy is increasing exponentially and is expected to increase at much higher rate. Although renewable sources of energy comes with some great technical and environmental advantages but the intermittent nature of the supply causes fluctuation in the power supply when connected to the distribution system. The purpose of this project is to examine the problems associated with integration of PV in distribution system and study the impact of battery storage system in controlling the overvoltages and under-voltages in distribution system which arises due to the intermittent nature of supply of photovoltaic cells. The project focuses on developing different control strategies for battery storage system which can help in maintaining the feeder voltages within specified limits in all conditions. The control strategy used in the project is a coordinated control strategy which includes a local droop control along with distributed control strategy which ensures that the voltages in the feeder remains within specified limits. Local Droop control method is used to determine the initial power shared between Battery storage system and the network while the distributed control strategy consists of two different consensus algorithms which make sure that the batteries operate according to their installed capacity and state of charge so that the batteries does not saturate or deplete at an early stage. Simulations of the proposed control strategy is carried out in MATLAB Simulink for single bus system containing PV array, Battery storage system and the three phase AC load connected via Inverter and for 5 bus system to check the effectiveness of the distributed control strategy. The results obtained under different conditions which shows that the control strategy used in the project is effective in maintaining the feeder voltage within specified limits.