• Title, Summary, Keyword: Harmonic source

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A New Assessment for the Total Harmonic Contributions at the Point of Common Coupling

  • Han, Jong-Hoon;Lee, Kyebyung;Song, Chong Suk;Jang, Gilsoo;Byeon, Gilsung;Park, Chang-Hyun
    • Journal of Electrical Engineering and Technology
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    • v.9 no.1
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    • pp.6-14
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    • 2014
  • A new method to determine the total harmonic contributions of several customers and the utility at the point of common coupling is presented. The proposed method can quantify the individual harmonic impact of each suspicious harmonic source at the point of common coupling. The individual harmonic impact index is then used to assess the total harmonic contribution of each harmonic source. This index can be calculated by the results processed from instantaneous harmonic voltage and current phasor values. The results demonstrate the performance of the proposed method in terms of steady-state accuracy and response to time-varying operating conditions. The proposed index can be used for billing purposes to control harmonic distortion levels in power systems.

Design and Development of Harmonic Power Source Control Module (고조파 전원발생장치의 제어기 설계 및 개발)

  • Lee, S.I.;Yoo, J.G.;Jeon, J.C.;Jeon, H.J.;Heo, H.S.;Choe, G.H.
    • Proceedings of the KIPE Conference
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    • pp.40-42
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    • 2007
  • Recently the harmonic generation has deteriorated the quality of electricity and affected the performance on the electrical installation including personal computer, fax, community devices and so on. Some studies of harmonic affects in diagnosis and the cause of accident has not done by the experimental data of harmonic source but merely by presumption according to qualitative analysis. So, in order to research the harmonic affect on the electrical installation according to quantitative analysis and gather reliable data over and over again, it is necessary to develop an Harmonic power source which is capable of generating some harmonics. In this paper, we described about realization of Harmonic power source control module which can produce and added harmonics for the analysis due to harmonic effects.

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Design and Application of a Single Phase Multilevel Inverter Suitable for using as a Voltage Harmonic Source

  • Beser, Ersoy;Arifoglu, Birol;Camur, Sabri;Beser, Esra Kandemir
    • Journal of Power Electronics
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    • v.10 no.2
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    • pp.138-145
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    • 2010
  • This paper presents a single phase multilevel inverter for using as a voltage harmonic source. First, a single phase multilevel inverter system is presented and the structural parts of the inverter are described. In order to obtain multilevel output voltage waveforms, a switching strategy based on calculating switching angles is explained and an improved formula for determining switching angles is given. Simulation and experimental results of multilevel voltage waveforms are given for 15, 31 and 127 levels. The proposed topology does not only produce output voltages with low THD values. It also produces the required harmonic components on the output voltage. For this purpose, equations for switching angles are constituted and the switching functions are obtained. These angles control the output voltage as well as provide the required specific harmonics. The proposed inverter structure is simulated for various functions with the required harmonic components. The THD values of the output voltage waves are calculated. The simulated functions are also realized by the proposed inverter structure. By using a harmonic analyzer, the harmonic spectrums, which belong to the output voltage forms, are found and the THD values are measured. Simulation and experimental results are given for the specific functions. The proposed topology produces perfectly suitable results for obtaining the specific harmonic components. Therefore, it is possible to use the structure as a voltage harmonic source in various applications.

Series-Active and Shunt-Pasive Type Power Filter Compensating Harmonic Currents and Unbalanced Voltages of Source (직렬형 능동필터와 수동형 병렬필터를 이용한 전원불평형 및 고조파 전류 보상)

  • Lee G-Myoung;Lee Dong-Choon
    • Proceedings of the KIPE Conference
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    • pp.565-568
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    • 2001
  • A novel control scheme compensating for source voltage unbalance and harmonic current for series active power filters is proposed, where the references for voltage unbalance and current harmonic and phase angle is derived from the positive sequence component of the source voltage obtained simply through digital all-pass filters, which makes the whole control algorithm simpler than other methods using p-q theory. In addition, the harmonic component of source current is compensated by harmonic component of load voltage and therefore fundamental component of source current is considered as separated terms for the control issue. The validity of the proposed scheme has been verified by experimental results.

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A Study on the Series and Parallel Resonant Filters for Harmonic Currents Reduction of Nonlinear Loads (비선형부하의 고조파전류 저감을 위한 직렬 및 병렬 동조필터에 관한 연구)

  • 김경철;강윤모;백승현;김종욱
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.17 no.6
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    • pp.113-118
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    • 2003
  • This paper characterizes typical nonlinear loads into two types of harmonic sources, i.e., harmonic voltage source and harmonic current source. A series resonant filter is very effective in harmonic reduction for harmonic voltage source type of nonlinear loads such as personal computer loads with smoothing dc capacitors. A parallel resonant filter is suited for current source type of nonlinear loads such as ac drives with smoothing dc reactors. General compensation characteristics and comparison of series and parallel resonant filters are given analytically and experimentally. Compliance with IEC Std 1000-3-2 has been evaluated for limiting harmonic distortion.

Compensation of Source Voltage Unbalance and Current Harmonics in Series Active and Shunt Passive Power Filters

  • Lee G-Myoung;Lee Dong-Choon
    • Proceedings of the KIPE Conference
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    • pp.586-590
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    • 2001
  • In this paper, a novel control scheme compensating source voltage unbalance and harmonic currents for hybrid active power filters is proposed, where no low/high-pass filters are used in compensation voltage composition. The phase angle and compensation voltages for source harmonic current and unbalanced voltage components are derived from the positive sequence component of the unbalanced voltage set, which is simply obtained by using digital all-pass filters. Since a balanced set of the source voltage obtained by scaling the positive sequence components is used as reference values for source current and load voltage, it is possible to eliminate the necessity of low/high-pass filters in the reference generation. Therefore the control algorithm is much simpler and gives more stable performance than the conventional method. In addition, the source harmonic current is eliminated by compensating for the harmonic voltage of the load side added to feedback control of the fundamental component.

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Voltage THD Mitigation of Power Distribution System using Z-Source Active Power Filter with a Fuel Cells Source (연료전지 전원을 갖는 Z-소스 능동전력필터에 의한 장거리 배전선로의 전압 THD 저감)

  • Jung, Young-Gook
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.12
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    • pp.2161-2166
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    • 2008
  • This paper deals with a Z-source active power filter(Z-AFU) for mitigation voltage THD(total harmonic distortion) due to voltage harmonic propagation(amplification) in 6.6kv power distribution system. Bus voltage harmonic signal is detected by 60Hz butterworth BPF(band pass filter). As an ESS(energy storage system) of the proposed system, PEM fuel cells(Ballard NEXA, 1.2kw) is employed. Test results based on PSIM(power electronics simulation tool) validate the proposed approach.

High-Performance Millimeter Wave Harmonic Output Oscillator using Sub-Harmonic Wave Injection-Synchronization (서브하모닉 주입동기에 의한 밀리미터파 대역 고조파 발진기의 고성능화)

  • Choi, Young-Kyu;Nam, Byeong-Gun
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.12 no.1
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    • pp.17-24
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    • 2008
  • This paper deals with a millimeter wave source which is utilizing sub-harmonic injection-synchronization technique. A 8.7GHz oscillator with MES-FET is fabricated, and is driven as a harmonic output oscillator at 17.4GHz by means of sub-harmonic injection-synchronization. The oscillator operates as a multiplier as well as oscillator in this system. Adopting this technique, we can obtain a high stable, high frequency millimeter wave source even though self-oscillating frequency of an oscillator is relatively low. In the experiments, the range of injection-synchronization is about 26MHz and is proportional to the input sub-harmonic power. From the spectrum analysis of the 2nd harmonic output. we blow that the phase noise of the harmonic oscillator is remarkably decreased.

A Novel Harmonic Identification Algorithm for the Active Power Filters in Non-Ideal Voltage Source Systems

  • Santiprapan, Phonsit;Areerak, Kongpol;Areerak, Kongpan
    • Journal of Power Electronics
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    • v.17 no.6
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    • pp.1637-1649
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    • 2017
  • This paper describes an intensive analysis of a harmonic identification algorithm in non-ideal voltages source systems. The dq-axis Fourier with a positive sequence voltage detector (DQFP) is a novel harmonic identification algorithm for active power filters. A compensating current control system based on repetitive control is presented. A design and stability analysis of the proposed current control are also given. The aim of the paper is to achieve a robustness of the harmonic identification in a distorted and unbalanced voltage source. The proposed ideas are supported by a hardware in the loop technique based on a $eZdsp^{TM}$ F28335 and the Simulink program. The obtained results are presented to demonstrate the performance of the harmonic identification and the control strategy for the active power filter in non-ideal systems.

Harmonic Optimization Techniques in Multi-Level Voltage-Source Inverter with Unequal DC Sources

  • Aghdam, M. Ghasem Hosseini;Fathi, S. Hamid;Gharehpetian, Gevorg B.
    • Journal of Power Electronics
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    • v.8 no.2
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    • pp.171-180
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    • 2008
  • One of the major problems in electric power quality is the harmonic contents. There are several methods of indicating the quantity of harmonic contents. The most widely used measure is the total harmonic distortion (THD). Various switching techniques have been used in static converters to reduce the output harmonic content. This paper presents and compares the two harmonic optimization techniques, known as optimal minimization of the total harmonic distortion (OMTHD) technique and optimized harmonic stepped-waveform (OHSW) technique used in multi-level inverters with unequal dc sources. Both techniques are very effective and efficient for improving the quality of the inverter output voltage. First, we describe briefly the cascaded H-bridge multi-level inverter structure. Then, we present the switching algorithm for the inverter based on OHSW and OMTHD techniques. Finally, the results obtained for the two techniques are analyzed and compared. The results verify the effectiveness of the both techniques in multi-level voltage-source inverter with non-equal dc sources, clarifying the advantages of each technique.