• Title/Summary/Keyword: Active power regulation

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Constant Frequency Adjustable Power Active Voltage Clamped Soft Switching High Frequency Inverter using The 4th-Generation Trench-Gate IGBTs

  • Miyauchi T.;Hirota I.;Omori H.;Terai H.;Abdullah Al Mamun;Nakaoka M.
    • Proceedings of the KIPE Conference
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    • 2001.10a
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    • pp.236-241
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    • 2001
  • This paper presents a novel prototype of active voltage-clamping capacitor-assisted edge resonant soft switching PWM inverter operating at a constant frequency variable power (VPCF) regulation scheme, which is suitable for consumer high-power induction-heating cooking appliances. New generation IGBT with a trench gate is particularly improved in order to reduce conduction loss due to its lowered saturation voltage characteristics. The soft switching load resonant and quasi-resonant inverter designed distinctively using the latest IGBTs is evaluated from an experimental point of view.

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Power Factor with Single Power Stage AC/DC Converter Operated in Active-Clamp Mode (능동 클램프 모드로 동작하는 단일 전력 AC/DC 컨버터에 의한 역률개선)

  • Yoon, Shin-Yong;Baek, Hyun-Soo;Kim, Yong;Kim, Cherl-Jin;Eo, Chang-Jin
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.50 no.8
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    • pp.392-401
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    • 2001
  • This paper presents the single-stage high power factor AC to DC converter operated in active-clamp mode. The proposed converter is added active-clamping circuit to boost-flyback single-stage power factor corrected power supply. The active-clamping circuit limits voltage spikes, recycles the energy trapped in the leakage inductance, and provides a mechanism for achieving soft switching of the electronic switches to reduce the switching loss. The auxiliary switch of active-clamping circuit uses the same control and driver circuit as the main switch to reduce the additional cost and size. To verify the performance of the proposed converter, a 100W converter has been designed. The proposed converter gives good power factor correction, low line current harmonic distortions, and tight output voltage regulation, as used unity power factor.

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Modified Control Scheme to Regulate the Active Power Output of Doubly Fed Induction Generator (이중여자 권선형 유도발전기의 출력조정을 위한 제어 기법)

  • Park, Young-Ho;Won, Dong-Jun;Park, Jin-Woo;Moon, Seung-Il
    • Proceedings of the KIEE Conference
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    • 2007.07a
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    • pp.1232-1233
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    • 2007
  • As the number of wind turbines installed increase, the power from wind energy starts to replace conventional generation units and its influence on power system can not be neglected. Because of the intermittent nature of wind resource, the output power of wind turbine fluctuates according to wind speed variation. In this point of view, it is necessary for wind turbines to be equipped with power regulation ability. The doubly fed induction generator (DFIG) is one of the main techniques used in variable speed wind turbines. This thesis focuses on the development of modified control scheme of DFIG to regulate output power. The proposed control scheme achieves active power output regulation so as to stabilize the power system.

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A Simplified Control Algorithm for Three-Phase, Four-Wire Unified Power Quality Conditioner

  • Singh, Bhim;Venkateswarlu, P.
    • Journal of Power Electronics
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    • v.10 no.1
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    • pp.91-96
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    • 2010
  • In this paper, a simplified control algorithm for a three-phase, four-wire unified power quality conditioner (UPQC) is presented to compensate for supply voltage distortions/unbalance, supply current harmonics, the supply neutral current, the reactive power and the load unbalance as well as to maintain zero voltage regulation (ZVR) at the point of common coupling (PCC). The UPQC is realized by the integration of series and shunt active filters (AFs) sharing a common dc bus capacitor. The shunt AF is realized using a three-phase, four leg voltage source inverter (VSI) and the series AF is realized using a three-phase, three leg VSI. A dynamic model of the UPQC is developed in the MATLAB/SIMULINK environment and the simulation results demonstrating the power quality improvement in the system are presented for different supply and load conditions.

Operation Scheme to Regulate Constant Active Power Output of Wind Turbine and Fuel-Cell Hybrid System (정출력 조정을 위한 풍력-연료전지 하이브리드 시스템의 운영 기법)

  • Kim, Yun-Seong;Moon, Dae-Seong;Won, Dong-Jun
    • Proceedings of the KIEE Conference
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    • 2008.07a
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    • pp.1174-1175
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    • 2008
  • A operation scheme to regulate the active power output of the hybrid system consisted of a doubly fed induction generator(DFIG) and a fuel-cell are presented. The power output of the wind turbine fluctuates as the wind speed varies and the slip power between the rotor circuit and power converter varies as the rotor speed change. A fuel cell system can be individually operated and adjusted output power. In this paper, a fuel-cell is performed to regulate the active output power in comparison with the active power output of a DFIG. Based on PSCAD/EMTDC power system tools, we simulated a DFIG and a fuel cell and investigated about dynamics of the output power in hybrid system.

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New Circuit Topology of Single-Ended Soft-Switching PWM High Frequency Inverter and Its Performance Evaluations

  • Deguchi Y.;Moisseev S.;Nakaoka M.;Hirota I.;Yamashita H.;Omori H.;Terai H.
    • Proceedings of the KIPE Conference
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    • 2001.10a
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    • pp.247-250
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    • 2001
  • This paper presents a simple and cost effective circuit topology of single-ended type high frequency quasi-resonant PWM inverter using IGBTs, which can operate under wide soft switching operation range based on ZCS for main power switch as compared with a conventional active voltage-clamped ZVS-PWM high frequency quasi-resonant inverter developed previously. In principle, this new circuit topology can efficiently operate under a constant frequency PWM control-based power regulation scheme. In particular, it is noted that the zero current soft switching (ZCS) commutation can achieve for the main active power switch. On the other hand, the zero voltage soft switching (ZVS) commutation can also achieve for the auxiliary active power switch. The operating principle of this high-frequency Inverter treated here and its power regulation characteristics are illustrated on the basis of the simulation and feasible experimental results.

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An Integrated Single-Stage Zero Current Switched Quasi-Resonant Power Factor Correction Converter with Active Clamp Circuit (능동 클램프 회로를 적용한 단상 ZCS 공진형 역률개선 컨버터)

  • 이준영;문건우;고관본;윤명중
    • Proceedings of the KIPE Conference
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    • 1999.07a
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    • pp.626-630
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    • 1999
  • A new integrated single-stage zero current switched(ZCS) quasi-resonant converter (QRC) for the power factor correction(PFC) converter is introduced in this paper. The power factor correction can be achieved by the discontinuous conduction mode(DCM) operation of an input current. The proposed converter has the characteristics of the good power factor, low line current harmonics, and tight output regulation. Furthermore, the ringing effect due to the output capacitance of the main switch can be eliminated by use of active clamp circuit.

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A New Control Scheme of the Line-Interactive UPS Using the Series Active Compensator (직렬 능동 보상기를 이용한 Line-Interactive UPS의 새로운 제어 기법)

  • Jang, Hoon;Lee, Woo-Cheol;Hyun, Dong-Seok
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.52 no.8
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    • pp.405-412
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    • 2003
  • This paper presents a three-phase Line-Interactive uninterruptible power supply (UPS) system with series-parallel active power-line conditioning capabilities, using synchronous reference frame (SRF) based controller, which allows an effective power factor correction, source harmonic voltage compensation, load harmonic current suppression, and output voltage regulation. The three-phase UPS system consists of two active power compensator topologies. One is a series active compensator, which works as a voltage source in phase with the source voltage to have the sinusoidal source current and high power factor under the deviation and distortion of the source voltage. The other is a parallel active compensator which works as a conventional sinusoidal voltage source in phase with the source voltage, providing to the load a regulated and sinusoidal voltage with low THD (total harmonic distortion). The control algorithm using SRF method and the active power flow through the Line-interactive UPS systems are described and studied. The simulation and experimental results are depicted in this paper to show the effect of the proposed algorithm.

Analysis and Design of Quadruple-Active-Bridge Converter Employing Passive Power Decoupling Capability (수동 전력 비동조화가 가능한 QAB 컨버터의 분석과 설계에 관한 연구)

  • Yun, Chang-Woo;Lee, Jun-Young;Baek, Ju-Won;Jung, Jee-Hoon
    • The Transactions of the Korean Institute of Power Electronics
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    • v.27 no.2
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    • pp.157-164
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    • 2022
  • This study proposes an enhanced quadruple-Active-Bridge (QAB) converter that can solve power coupling problems. By adopting a multiple winding transformer, the equivalent circuit of a conventional QAB converter has power couplings between arbitrary output ports. This coupling is an unintended power relationship that complicates the regulation of output voltage of the multiple ports. The proposed converter can carry out power decoupling by changing the arrangement of the coupling inductor. Power transfer equations for the proposed converter and its operating principles are analyzed in detail. The power coupling caused by the transformer's leakage inductance is verified by using a proposed coupling factor that presents the relationship between inductance ratio and coupling power. In addition, the decoupling power control performance of the proposed converter is verified by simulation and a 3 kW prototype converter.

3-Phase Hybrid Series Active Power Filter with Instantaneous Voltage Fluctuations Compensation (순간전압변동 보상 기능을 갖는 3상 하이브리드형 직렬 능동전력필터)

  • 한석우;최규하
    • The Transactions of the Korean Institute of Power Electronics
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    • v.5 no.6
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    • pp.544-551
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    • 2000
  • In this paper, 3-phase hybrid series active power filter for compensate current harmonics, voltage drop and unbalanced voltage in the network presented. The proposed system is implemented with a space vector modulation voltage source inverter and a high pass filter connected in parallel to the power system. Here the load is six-pulses thyristor rectifier. The phase angle detected in order to generation reference voltage at load terminal is synchronized with the positive sequence component of the unbalanced source by using symmetrical component transformation. The proposed system has an function harmonic isolation between source and load, voltage regulation, and unbalance compensation. Therefore, what the power system is improved quality, the source current is maintained as a nearly sinusoidal waveform and the load voltage is regulated with a rated voltage regardless of the source variation condition. To verify the validity of the proposed compensating system, the computer simulation and experiment are carried out.

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