Journal of Applied Science and Engineering (May 2022)
Effect Of Filter Current Reduction On Hybrid Shunt Active Filters In Three-phase Four Wire Network With Unbalanced Linear And Non-Linear Loads
Abstract
The growing small scale industries facing problems in their network seeking statutory requirement for the utility supply system less than 33 kV. These problems aggravate the network operating conditions causing failure of capacitors due to excessive charging current and mis operation of the relay which are interrupting the process causing increase the cost and time of product delivery. The industries having moderate single-phase and unbalanced Non-linear loading predominantly having problems in current compensation This paper considered a network at 440 V from 33 kV supply system. The problem mainly at the level of 440 V with diverse loads of passive and Non-linear loading conditions. It is found that the utility levying additionally the compensatory charges for low power factor (LPF) when it less than 0.9 and high % Total Harmonics Distortion (THD) limiting 8% based on the average maximum demand current. This research work provides the solution for the operating network which interacting with utility supply systems to determine the occurrence of abnormal conditions such as harmonics resonance and neutral over current and its harmonics. It also worked out the performance of the network operating conditions before and after reactive power compensation. The d-q-0 theory of compensation used in Hybrid Shunt Active Power Filter (HSAPF) with unbalanced loading condition provides a comprehensive solution with Passive Compensation for Load Balancing (PCLB) and also reducing total harmonics distortion to some extent. The current compensation by the Shunt Active Power Filtering with load balancing considerably reduced its rating by suitable passive compensation in the network are discussed in this paper.
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