Harmonic Elimination Using STATCOM for SEIG Fed Induction Motor Load

Abstract

Non-linear loads connected to distribution system induce harmonics in to source components and the presence of harmonics in source components affects the performance of other sensitive loads connected at the same point. Induction motor load for drive system should be operated with variable frequency and variable voltage for its speed control. To vary the voltage and frequency, induction motor is fed from an inverter. This total drive set-up constitutes non-linear load type and will be the source of harmonics. This paper depicts the suppression of harmonics with STATCOM in distribution system when induction motor load is fed from SEIG (singly excited inductin generator). STATCOM is controlled with simple synchronous reference frame theory and the results are shown for source current, load current. THD in source current and load current was also shown for the said system. System for single-phase and three-phase induction motor drive was developed and results are shown using MATLAB/SIMULINK software. Keyword:Compensation Harmonics Induction Motor SEIG STATCOM Copyright © 2017 Institute of Advanced Engineering and Science.All rights reserved. Corresponding Author:Satyanarayana Gorantla, Department of EEE, Anurag Engineering College, Acharya Nagarjuna University, AP, India. Email: satyanarayana345678@gmail.com INTRODUCTIONInduction motor being constructed robust and requires less maintenance is used in almost every industrial applications for mechanical operations. Industries emit pollution and the electric motor drive system employed for industrial applications should be tolerant to pollution. Induction motor is such a kind of machine and is used mostly. Drive system is generally used in many applications as speed control of motors gives high efficiency of process output. Induction motor when used for drive system, either terminal voltage of motor or frequency of input supply or both can be varied to run the motor at desired speed. To vary the frequency or terminal voltage of motor, induction motor is supplied from an inverter. Inverter can produce desired voltage and frequency at the output. Inverter fed induction motor can work effectively as drive system. For inverter, the input supply should be DC type and thus the input supply is to be rectified first and then fed as input to inverter. This complete power electronic converter set-up constitutes non-linear load.Non-linear loads when connected to distribution system induce harmonics in source components. Non-linear loads draw non-linear components of source currents and hence induce harmonics in the source components. Distortions in source components are not allowed and insist for compensation. Harmonics can cause excessive heating in coils and eventually may damage the coils. Custom power devices [1]-[4] are proved to be good for compensating power quality issues [5]-[8]. STATCOM is a type of flexible AC transmission (FACTS) compensator employed for power quality mitigation especially harmonics. This paper depicts the suppression of harmonics with STATCOM [9]- [...

Power quality improvement using fuzzy logic controller based unified power flow controller

“…The SSSC is used to control power flow and to improve transient stability [10][11][12], while the STATCOM is used to regulate line voltage by injecting or absorbing the reactive power to the system [13][14][15][16][17]. The UPFC is one of the FACTS family members with very versatile uses [18][19][20][21], it has the ability to control the transmission line parameters (voltage, impedance, and phase angle) at the same time.…”