Distribution Network Voltage Improvement using Dynamic Voltage Restorer with Smooth Super Twisting Sliding Mode Control

Abstract

Sensitive industrial customers need higher Power Quality (PQ). End-users and electrical utility firms are both paying more attention to PQ problems as a result of massive financial losses caused by PQ problems to sensitive industrial loads. The most important and frequently recurring PQ problems in a secondary distribution system are voltage sags and swells. A rapid, adaptable, dynamic Custom Power Device called the Dynamic Voltage Restorer can be utilized to reduce voltage sags and swells. The control approach selected for switching Voltage Source Converters (VSCs) largely determines its performance. By using the Sliding Mode Control (SMC) with Smooth Super Twisting Algorithm (SSTA), this research successfully removes the effects of voltage sags and swells on the VSC of DVR. When SSTA is used in conjunction with conventional SMC, chattering, a downside of SMC, is reduced while keeping other advantages including robustness, shorter response times, and insensitivity to changings in the load. The efficiency of this technique is evaluated using the MATLAB/Simulink SimPower System toolbox. The simulation's findings demonstrate that the Smooth Super Twisting Sliding Mode Controller (SSTSMC) for DVR device can identify and compensate the voltage sags/swells in less than 2 milliseconds (ms), which is significantly less time than the 20 milliseconds allowed limit of SEMI F-47 standard for sensitive loads and the values of Total Harmonics Distortion (THD) is less than 5%. The comparative study also performed between Real Twisting Algorithm (RTA) and proposed technique Smooth Super Twisting Algorithm (SSTA), which shows that performance of proposed SSTSMC is much better than RTA.