Observations and Analysis of Power Quality Indices Using Custom Power Devices in Power Distribution Network

Abstract

AbstractThe overall performance of the electricity distribution network is determined from various parameters. Power quality indices such as drop in voltage, rise in voltage, and harmonics play an essential role in this context. The article introduces a new index called the power quality distortion (DI). This index gives information about the contribution of non-linear load to the harmonic distortion in power. This effect has been observed due to the presence of non-linear component of current drawn by the load. Changes in the supply voltage in the form of dips, over voltages, harmonics, transients, etc., are considered major power quality issues. This has led to deterioration in the quality of the energy delivered to end customers and generates disruptions on the utility side. Load presents at the consumer end also explains the degradation in the quality of the power supply. Initially, penalties were charged for low p.f. consumers, and then, corrective measures were initiated by the consumer. In the same way to control the power quality, penalty is proposed to the consumers who are hampering the quality of power by application of non-linear load without using any mitigation technique. One of the mitigation techniques is custom power devices (CPDs). It is more effective as compared to traditional methods. This article provides various power quality indices such as distortion index as a power quality calculation parameter and the results obtained by application of dynamic voltage restorer (DVR) and hybrid-STATCOM for reducing the effect of the voltage sag and other indices of the quality of power in the electrical network. The proposed concept allows operation in non-linear conditions on the consumer side. The design of the system parameters is proposed based on the compensation parameter as an index of distortion of the distribution network. The simulation is carried out by the MATLAB model, and the results are compared with the analyzed performance of the power distribution system with regards to the index of distortion with injection of DVR and hybrid-STATCOM.KeywordsPower quality (PQ)Custom power devices (CPDs)Dynamic voltage restorer (DVR)Hybrid-STATCOMDistortion index (DI)Total harmonic distortion in voltage (VTHD)Total harmonic distortion in current (ITHD)Active power filters (APFs)Battery energy storage systems (BESSs)