Power Quality Enhancement Using Dynamic Voltage Restorer (DVR)-Based Predictive Space Vector Transformation (PSVT) With Proportional Resonant (PR)-Controller

Abstract

In the power distribution system, the Power Quality (PQ) is disturbed by the voltage sag and swells. The Dynamic Voltage Restorer (DVR) is used to enhance various PQ problems like voltage sag, swells, and Harmonics. The previous Intrinsic Space Vector Transformation (ISVT) control techniques with DVR system, to compensate the power quality issue. It produced a steady-state error, low efficiency, and high THD. The SMES based DVR has provided excellent results in overcoming these issues. The energy is stored by DVR through a storage element, which takes alternate energy from a Solar PV cell. The Maximum Power Point Tracking (MPPT) based P&O algorithm is implemented to equalize the solar power. The Voltage Source Inverter (VSI) generates the reactive power, which has to be compensated with the help of Pulse Width Modulation (PWM) and the feedback control loop are essential to enhance the injection of reactive power to the line. Due to this reason, a proposed Predictive Space Vector Transformation (PSVT) control-based DVR is implemented. It analyzes the variation of power on the distribution side and generates the proper feedback control to the inverter systems. In the instant of voltage injection to the line with the help of DVR, the phase angle mismatch happens which is not synchronized reactive power to the grid. Due to the non-synchronization of reactive power, more harmonic distortion is generated. A Proportional Resonant (PR) controller is introduced, which is Proportional Resonant (PR) current controller. The current injected by the inverter into the grid in phase with the grid voltage maintain constant with unity power factor. The PR controller design is cascaded with a harmonic compensator to mitigate low order odd harmonic components present in the output current of VSI and minimize the total harmonic distortion (THD). The performance of the proposed is evaluated using MATLAB 2017b software.

A Review of Control Techniques and Energy Storage for Inverter-Based Dynamic Voltage Restorer in Grid-Integrated Renewable Sources

“…Preliminary research was carried out on DVR without DC-link before 1996 [84]. A few developments in this topology were reported in [85][86][87] after the development of bidirectional switch escalating the progress of AC-AC converter-based DVR [88]. According to the nature of voltage sags, a control scheme is proposed to compensate for the sag with phase jump in [89].…”

“…In addition to mitigating the sag and swelling, the DVR can execute other functions such as compensation of selective voltage harmonics [86,270,271], mitigation of voltage flickers [272][273][274], reactive power compensation [275], and frequency compensation [276]. Protection of the DVR [277] is very important during the fault at the load side of the DVR; otherwise, the same downstream fault current is present in the DVR, and it may damage the DVR.…”

Improvement of voltage stability for grid connected solar photovoltaic systems using static synchronous compensator with recurrent neural network

“…Nowadays, power quality is considered as a major issue in industrial sectors because of increasing sensitive loads [1,2]. In general, the power quality problems greatly affect the distribution side which results in malfunctioning and failure of sensitive loads [3]. Majority of power quality issues are caused by nonlinear loads and harmonic imbalances [4].…”

Three Phase Four Switch Inverter Based DVR for Power Quality Improvement With Optimized CSA Approach

“…Another approach based on the smart branch controller was adopted to compensate for various disturbances in the power quality. The elimination of harmonics is performed without any filter, but the smart branch controller generates nonlinearity in the circuit [56][57][58][59][60]. Fuzzy logic-based compensation is also adopted to improve the power quality; however, the validation requires extensive testing with a hardware setup [61].…”