IMPLEMENTATION OF THE ELECTRICAL SPRING FOR ENHANCING THE POWER QUALITY IN PV BASED DC GRID

Abstract

Now A Days the Electric Spring (ES) Concept Has Been Emerged Based On The Mechanical Spring Concept. ES Can Be Employed In AC Or DC Grid For Demand Side Management, And Improving The Power Quality And Energy Management. Renewable Energy Sources (Res) Are Intermittent In Nature, So The ES Is Introduced In The DC Grid For Stabilizing The Voltage Fluctuations Incurred By The Res Power Changes Such As PV Systems. The DC ES Is Inserted in The DC Grid In Series With The Non-Critical Loads (E.G. Thermostatically Controlled Loads As Air Conditioning Systems, Electric Water Heaters And Refrigerators Or Charging Of Charging Of Plug In Electric Vehicles) Forming A Smart Load.

In This Paper, A Comparison Between the Series And Shunt DC ES Is Held Considering Four Different Operation Modes. An ES Based on Four quadrant DC-DC Converter Is Analysed And Designed For Providing A Bi-Directional Power Flow. Simulation Results For Both Open And Closed Loop Operations, Using MATLAB/Simulink, Implementation of The Electrical Spring For Enhancing The Power Quality In PV Based DC Grid, Different Electrical Springs Distributed Across The Grid Reduces The Rating Of Individual Springs And Hence The Cost And Complexity. Using Appropriate Control Strategies, ES Provides Voltage and Power Regulation, Reduced Harmonic Distortion, High Power Factor and Good Power Quality.