Voltage Sag, Swell, and Interruption Compensation Using DVR Based on Energy Storage Device

Abstract

The primary objective of this study is to provide a Z-Source Inverter (ZSI)-DVR that incorporates PI controller technology to enhance power quality. In the proposed DVR, conventional VSI is replaced with ZSI, which offers many benefits such as buck/boost, a wider voltage boost gain range, less voltage stress, and fewer passive components. To safeguard the load against fluctuations in the supply voltage, the distribution voltage regulator (DVR) is meant to be attached just after the transformer. To create error signals, the three-phase supply voltages are continuously monitored, transformed into DirectQuadrature-Zero (DQ0) quantities, and then compared to the reference value. A zero-error indication indicates that the availability voltage is operating at its rated value. Therefore, neither the control circuitry nor the ZSI will provide a compensatory voltage, and neither will produce PWM. Under these circumstances, a breaker will also short circuit the series transformer's secondary winding. A zero-voltage injection into the line is therefore produced by the DVR. Load voltage is therefore kept constant at its rated value, which is identical to supply voltage. Unbalanced and below rated value, the three-phase voltages result from supplyside sags, swells, or interruptions. Consequently, the DQ0 frame is where error signals can be produced. Relying on the inverse DQ0 transformation, these DQ0 frame error signals are transformed into three-stage voltages once again. The three phase signals of error are used to create switching pulses for the ZSI. The load voltage is kept at its rated value by injecting the produced compensating voltage alongside the supply voltage via the series transformer. Maintaining the necessary voltage to the load is achieved by the suggested topology's dynamic compensation of voltage interruptions, swell, and sag. In this case, the performance of the traditional DVR topology has been enhanced by integrating the Hybrid Control method PI. Using solar electricity to compensate for various voltage changes, the model demonstrates how a DVR may operate. The MATLAB/SIMULINK environment is used to simulate the performance of the ZSI-DVR with PI control method.