Investigation Into the Effects of Non-Linear Loading of Domestic Power Network on Home Appliances

摘要: Non-Linear loads such as Compact Fluorescent lamps (CFLs), Light Emitting diodes (LEDs),Solid state voltage regulators, and variable speed electric drives are increasingly being added tothe domestic, residential industrial power network. These light sources other house-hold appliances using electronic converters termed non-linear they introduce distortion in the network by generating harmonics current, leading to poor quality [1 − 4]. Power issues now becoming a major concern because of several reasons: a) Increasing dependence on electrical supply even small disruption or interruption not bearable it can halt modern lifestyle, b) new equipment highly sensitive c) components switched mode supplies poses disturbance challenges [5 7]. standards IEEE 519 is proposed to: a)assure that company should deliver clean consumers, assure protect from excessive stress, overheating loss operational life equipment. The 591 standard place puts limit allowed harmonic 3% individual 5% total (THD). This utmost importance present day situation due increasing loading. Although limits applied specific equipment, however, with high penetration loads, likely some suppression may be necessary [8 12]. problem waveform source which deviation sine wave. Another change amplitude an established reference level. Other caused current. With number devices system network, their impact performance like induction motors needs serious need further consideration. It well known approximately 60–70% all over world motor loads. Most used three-phase motors. However, single-phase load domestic setup. home uses large house hold different kind given Table 1. A shown for Fig. Mix connected across line. effects setting significant especially same paper investigate effect supplied behavior. Firstly stator current investigated. found %age 3rd significantly increases component When pure wave, contains 1.7% harmonic. injected 2.5% resulting contain 11% Hence concluded content strongly dependent waveform. Matlab/Simulink model developed capacitor start machine. procedure adopted follows: • Pure wave motor. Distorted produced inverter appropriate PWM scheme Non-linear CFLs LEDs emulated thyristor based converter. thyristors at firing angle order vary voltage. behavior under distorted conditionis recorded. setup 2 consist single phase Converter. rated 110V rms, 1500 rpm 0.5 HP. converter generated adding 5th fundamental component. this order: 2. Single-phase machine (capacitor start) At t = 0, controlled rectifier switching 30° turned on. will always drawn analyzed components. Each contribution becomes input generation Inverter. Sec, 60° Now we have two ac supply. resultant contribution. 4 90° d) 6 120° Efficiency estimation, output calculated multiplying torque (in rad/sec). extracting P, Q, S bridge block below 3. computation Fundamental frequency, estimated above block. as: absolute system, efficiency simulation results presented 4–6. Ripple seen when distorted. FFT (main winding) 7. Strong also harmonics.Sinusoidal Supply: 4. IM applied. Supply Inverter frequency (50 Hz) only: 5. DC/AC inverter. Fundamental, third fifth harmonic: 6. Harmonic spectrum source. Different powers measured 8 sine-wave observed requirement active, reactive apparent decreases increase distortion. Acknowledgment publication was made possible UREP grant # [17-061-2-017] Qatar National Research Fund (a member Foundation). statements herein solely responsibility authors. References [1] B.K. Bose, “Global Energy Scenario Impact Electronics 21st Century”, Trans. On Ind. Elect. Vol. 60, Issue. 7, pp. 2638–2651, 2013. [2] J. Mc Calley, V. Krishnan, K. Gkritza, R. Brown, D. Mejia-Giraldo, “Planning Long Haul: Investment Strategies Transportation Infrastructures”, Magazine, 11, Issue 5, 24–35, [3] M.K. Richard, P.K. Sen, “Compact Lamps Their Effect PowerQuality Application Guidelines”, Industry Applications Society Annual Meeting (IAS), 1–7, 2010. [4] C. Keyer, Timens, F. 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