Mansoor Ahmed Soomro ¹, Anwar Ali Sahito ¹, Irfan Ahmed Halepoto ¹, Kamran Kazi ¹

Affiliations
1 Department of Electrical Engineering, MUET, Jamshoro, Sindh, PK

Abstract

Power quality refers to the provision of the clean and stable electrical power supplies with least interruptions of current and voltage However, power quality problems arise due to the application of nonlinear loads with end user devices. Electrical installations majorly suffer from adverse effects of harmonic currents and voltages. Though, this problem has been decades long and pattern of investigation for the researchers but due to evolution of semiconductor technology, it has become burning issue with reference to the power system loads. Therefore, it becomes necessary to mitigate these harmonics for the safe operation of electrical appliances. Thus, harmonic passive filters are cost effective and easy to implement. In this work, the mitigation of current harmonics has been accomplished through single tuned Shunt Harmonic Passive Filter (SHPF). Furthermore, the application of six pulse multiplication converter technique ensures the mitigation of dominant 3rd harmonic currents and reduction of succeeding 5th and 7th harmonic currents. Furthermore, shunt operation of single tuned harmonic passive filter enables the current to follow the low impedance path. Consequently, the current harmonic distortion becomes less than 5 % according to allowable IEEE 519 -1992 standards. This reduction in harmonic distortion not only reduces the losses incurred in the system but it also improves the energy efficiency of the electrical Power Distribution System (PDS).

Keywords

IEEE 519 -1992 Standards, Energy Efficiency,Passive Harmonic Filters, Power Quality, Single Tuned Shunt Harmonic Passive Filter,Six Pulse Multiplication Converter.

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Anwar Ali Sahito ¹, Muhammad Azeem Arain ¹, Irfan Ahmed Halepoto ¹, Mansoor Ahmed Soomro ¹, Muhammad Juman Jumani ²

Affiliations
1 Department of Electrical Engineering, Mehran UET, Jamshoro, PK
2 Hyderabad Electric Supply Company, Hyderabad, PK

Abstract

Increasing wind power generation affects performance of existing power system in terms of power losses, voltage regulation and short circuit levels. Jhimpir wind generation having 49.5 MW capacity is connected to 132kV network of Hyderabd Electric Supply Company (HESCO) to meet its energy demand. Distribution network of HESCO is modelled and simulated using Power system Simulator – Siemens Network Calculator (PSS SINCAL) as simulation platform. Simulation results are compared to observe impacts of wind integration to existing power system network. Simulation results indicate reduction of power losses from 15.26 to 14.79MW as a result of wind integration to existing HESCO network. Reduction in power losses is mainly caused by changed current flows in lines. Reduction in current also reduce line drops resulting in improved bus voltages. Short circuit level is slightly increased for all buses due to network modification. Increase in short circuit level is highest near the wind generation as Zorlu grid shows 13.02% increase. 66kV network shows small increase in short circuit level due to its long distance from wind generation facility. Use of real network data for this research work identifies possible protection issues alongwith the reduction in power losses and voltage drop. Each system network has separate network parameters and will have different response to any network change. Hence a simulation analysis is important to ensure maximum benefits from renewable energy sources and their integration with existing power system network

Keywords

Distribution System, Power Losses, Short Circuit Level, Voltage Regulation, Wind Generation.

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