• Title, Summary, Keyword: Active power filter

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The Compensating Unbalanced Source Voltages for Unified Active Power Filter System (직.병렬 능동 전력필터 시스템을 이용한 불평형 전원전압 보상)

  • Kim, Young-Seok;Kang, Min-Hyung
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.4
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    • pp.716-723
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    • 2007
  • This paper suggests of a 3-phase 3-wire unified active power filter. The system is composed of a series active power filter and a parallel active power filter. The proposed series active power filter compensating unbalance source voltage and current harmonics of the parallel active power filter improves power factor. The proposed algorithm which improves for power factor and harmonic reduction are calculated by the performance function, and which compensates for the unbalanced source voltage is calculated based on the symmetrical component analysis. We composed a combined system of the series active power filter and parallel active power filter to confirm a validity of the proposed control methods. The effectiveness of the proposed algorithm is confirmed by the experiments.

A New Low Cost Hybrid Power Filter for Thyristor-Controlled Rectifier Load (싸이리스터 정류부하를 위한 새로운 저원가 복합형 전력필터)

  • 한성룡;김수근;석원엽;조정구;송의호;전희종
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.53 no.1
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    • pp.24-29
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    • 2004
  • A new low cost hybrid active filter for thyristor-controlled rectifier load is presented to overcome the high cost problem of the active or the other hybrid active filters. The proposed hybrid active filter which consists of tuned (5th and 7th harmonics) LC passive filters, power factor improvement(PFI) capacitor bank, and active filter compensates power factor as well as harmonic currents. Since most of harmonic currents are filtered by the passive filter and most of reactive power is compensated by the PFI capacitor bank, the power rating of active filter can be minimized, resulting in cost minimization of the proposed hybrid active filter. A 300kVA hybrid active filter system is implemented and tested using 1MVA thyristor rectifier load to verify the operation and performance.

An Over Current Protection Scheme for Hybrid Active Power filter

  • Lee Woo-Cheol;Chae Beom-Seok;Hyun Dong-Seok;Lee Taeck-Kie
    • Proceedings of the KIPE Conference
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    • pp.571-575
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    • 2001
  • A protection scheme for hybrid active power filters, which is combined shunt passive filter and small rated series active filter, is presented and analyzed in this paper. The proposed series active power filter operated as a high impedance 'k($\Omega$)' to the fundamental component when over current occurs in the power distribution system, and three control strategies are proposed in this paper. The first is the method by detecting the fundamental source current through the p-q theory, the second is the method by detecting the fundamental component of load current in Synchronous Reference Frame (SRF) and the third is the method by detecting the input voltage. When the over current occurs in the power distribution system, the proposed scheme protects the series active power filter without additional protection circuits. The validity of proposed protection scheme is investigated through experimental result for the prototype hybrid active power filter system.

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A Study on the series Active Power Filter for Harmonic Reduction of 3-Phase 3-Wire System (3상 3선식 시스템의 고조파 저감을 위한 직렬형 능동전력필터에 관한 연구)

  • 한윤석
    • Proceedings of the KIPE Conference
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    • pp.735-738
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    • 2000
  • In this paper we propose a series active power filter and a simple calculation method acquiring the reference voltage. A series active power filter is suitable to suppress harmonics produced by voltage type harmonic source such as a diode rectifier with filter capacitor on the DC side The proposed series active power filter system is applied to 3-phase 3-wire power system including the voltage type harmonic source. Experimental result obtained from a laboratory model are shown to verify the viability and effectiveness of the proposed system.

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Design and Simulation of Active Power Filter (전력 능동 필터의 설계 및 시뮬레이션)

  • 정동열;박종연;방선배
    • Proceedings of the IEEK Conference
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    • pp.2629-2632
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    • 2003
  • This paper presents the harmonics rejection technique and the simulation of a active power filter using power operational amplifier. The proposed active power filter consists of CT(current transformer), harmonics detector and harmonics amplifier. The harmonics detector is a high pass filter using a GIC(Generalized Impedance Converter). The harmonics amplifier consists of a power operational amplifier and passive filters. The simulation has been implemented by OR-CAD program. It is examined whether the proposed active power filter can be realized or not through simple experiments.

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Three-Phase Hybrid Shunt Filters for Power Quality Improvement

  • Bhuvaneswari, G.;G.Nair, Manjula
    • Journal of Power Electronics
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    • v.7 no.3
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    • pp.257-264
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    • 2007
  • Active power filters can be cost-effective for use in practical systems with the insertion of a few passive elements in shunt or series configuration. The resulting hybrid filters can be designed to provide dominant lower order harmonic elimination and reactive power support by the passive elements so that the burden on the active filter counterpart is reduced. In this paper, the rate reduction in the shunt active filter is estimated when it is connected in parallel with suitable passive tuned harmonic filters. The active filtering system is based on an appropriate control scheme. The simulation and the experimental results of the shunt active filter, along with the estimated value of reduction in rating, show that the hybrid shunt filtering system is quite effective in compensating for the harmonics and reactive power, in addition to being cost-effective.

Active Damping for Wind Power Systems with LCL Filters Using a DFT

  • Lee, June-Seok;Jeong, Hae-Gwang;Lee, Kyo-Beum
    • Journal of Power Electronics
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    • v.12 no.2
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    • pp.326-332
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    • 2012
  • This paper proposes a simple active damping algorithm for small-scale wind power systems with an LCL filter. Compared to an L filter or an LC filter, an LCL filter can decrease the harmonics induced by low switching frequencies and produce a satisfactory grid-side current using a comparatively low inductance. Additional active damping of the filter resonance is necessary when an LCL filter is used. This paper introduces an active damping method using a Discrete Fourier Transform (DFT) filter to improve performance without additional sensors or complexity. Experimental results are shown to verify the validity of the proposed algorithm as an active damping method.

Optimal Allocation Method of Hybrid Active Power Filters in Active Distribution Networks Based on Differential Evolution Algorithm

  • Chen, Yougen;Chen, Weiwei;Yang, Renli;Li, Zhiyong
    • Journal of Power Electronics
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    • v.19 no.5
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    • pp.1289-1302
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    • 2019
  • In this paper, an optimal allocation method of a hybrid active power filter in an active distribution network is designed based on the differential evolution algorithm to resolve the harmonic generation problem when a distributed generation system is connected to the grid. A distributed generation system model in the calculation of power flow is established. An improved back/forward sweep algorithm and a decoupling algorithm are proposed for fundamental power flow and harmonic power flow. On this basis, a multi-objective optimization allocation model of the location and capacity of a hybrid filter in an active distribution network is built, and an optimal allocation scheme of the hybrid active power filter based on the differential evolution algorithm is proposed. To verify the effect of the harmonic suppression of the designed scheme, simulation analysis in an IEEE-33 nodes model and an experimental analysis on a test platform of a microgrid are adopted.

Single-Tuned Active Filter with Function of Double-Tuned Active Filter (Double Tuned Active Filter 기능을 갖는 Single Tuned Active Filter)

  • Kim Chan-Ki;Yang Byeong-Mo;Jung Gil-Jo
    • The Transactions of the Korean Institute of Power Electronics
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    • v.9 no.6
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    • pp.544-552
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    • 2004
  • This paper deals with the hybrid active filter which can reduce the 11th/13th harmonics in AC network by using the single tuned filter. Since the proposed algorithm uses the detuning compensation capability of the filter, the output voltage of the proposed active power filter is changed according to the capacitance of capacitors, magnitude of harmonic current, resonance frequency and control mode. In this paper, the control characteristics and the design of hybrid active filter is investigated. A new hybrid active filter with new algorithm, which is an active filter with single tuned filter instead of double tuned filter, is proposed.

Hybrid Series Active Power filter Based on Performance Function Theory for 3-Phase 4-wire System (성능함수제어 알고리즘을 이용한 3상 4선식 하이브리드형 직렬능동전력필터)

  • Kim, Jin-Sun;Shin, Jae-Hwa;Kim, Young-Seok
    • Proceedings of the KIEE Conference
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    • pp.1096-1098
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    • 2003
  • In this paper, the control algorithm and control methods for a combined system of shunt passive filter and series active filter in 3-phase 4-wire system are discussed. Moreover, the 3-phase 4-wire system is widely employed in distributing electric energy to several office building and manufacturing plants. In such systems, the third harmonic and odd multiples of $3^{rd}$($9^{th}$, $15^{th}$, etc.) are termed as triple and zero sequence components that do not cancel each other in the system neutral. As a result, the triple harmonics add together creating a primary source of excessive neutral current. Regarding this concern, this paper presents a new control scheme for a series hybrid active system. This series active power filter acts not only as a harmonic compensator but also as a harmonic isolator. Hence the required rating of the series active filter is much smaller than that of a conventional shunt active filter. However, the performance of the combined system is greatly influenced by the filtering algorithm employed in the active power filter. This paper proposes a series active power filter scheme based on performance function. Some experiments was executed and experimental results from a prototype active power filter confirm the suitability of the proposed approach.

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