• Title, Summary, Keyword: Unified power quality conditioner (UPQC)

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Performance Analysis of UPQC(Unified Power Quality Conditioner) with Compensation Capability for Voltage Interruption (순간정전에 대한 보상능력을 갖는 UPQC(Unified Power Quality Conditioner)의 성능해석)

  • 김희중;배병열;한병문;설승기;조보형
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.52 no.5
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    • pp.279-286
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    • 2003
  • A new UPQC(unified power quality conditioner), which consists of series inverter, shunt inverter, dc/dc converter, and energy storage, is proposed. The proposing UPQC can compensate reactive power, harmonics, voltage sag and swell, voltage unbalance, and voltage interruption. The control strategy for the proposing UPWQC was derived using the instantaneous power method. The performance of proposing system was analyzed by means of the EMTDC/PSCAD simulation and the experimental work with the hardware prototype. The proposing UPQC has the ultimate capability of improving power quality at the point of installation on power distribution systems or industrial power systems and can be utilized for the custom power device in the future distribution system.

Performance Analysis for the UPQC(Unified Power Quality Conditioner) Interconnected to the Distributed Generation System (분산전원 연계형 UPQC(Unified Power Quality Conditioner)의 성능해석)

  • 김희중;배병열;한병문
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.53 no.3
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    • pp.152-160
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    • 2004
  • A novel UPQC(Unified Power Quality Conditioner), which consists of series inverter, shunt inverter, distributed generation system, is proposed. The proposing system can compensate reactive power, harmonics, voltage sag and swell, voltage interruption etc. through the change of paralleling operation mode and islanding operation mode. The control strategy for the proposing system was derived using the instantaneous power method. The performance of proposing system was analyzed by means of the PSCAD/EMTDC simulation and the experimental work with the hardware prototype. The proposing system has the ultimate capability of improving power quality at the point of installation on power distribution systems or Industrial power systems and can be utilized for the custom power device in th future distribution system.

Operation Analysis of Novel UPQC(Unified Power Quality Conditioner) without Series Injection Transformers (직렬주입변압기가 없는 새로운 UPQC(Unified Power Quality Conditioner)의 성능분석)

  • Kim H.J.;Bae B.Y.;Jon Y.S.;Han B.M.;Kim H.W.
    • Proceedings of the KIPE Conference
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    • pp.251-255
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    • 2003
  • This paper proposes a novel UPQC(unified power quality conditioner) based on H-bridge modules, isolated through single-phase multi-winding transformers. The dynamic performance of proposed system was analyzed by simulation with EMTDC/PSCAD, assuming that the UPQC is connected with the 22.9kV distribution line. The proposed system can be directly connected to the transmission line without series injection transformers. It has flexibility in expanding the operation voltage by increasing the number of H-bridge modules and can compensate reactive power, harmonics, voltage sag and swell, voltage unbalance. The control strategy for the proposing UPQC was derived using the instantaneous power method. The proposing UPQC has the ultimate capability of improving power quality at the point of installation on power distribution systems and can be utilized for the future distribution system.

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Operation Analysis of UPQC(Unified Power Quality Conditioner) based on H-bridge Modules (H-브리지 모듈로 구성된 UPQC(Unified Power Quality Conditioner)의 동작 분석)

  • Lee Bum-Kyoo;Bae Byung-Yeol;Baek Seung-Tak;Han Byung-Moon
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.54 no.1
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    • pp.1-7
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    • 2005
  • This paper proposes a novel UPQC(unified power quality conditioner) based on H-bridge modules, isolated through single-phase multi-winding transformers. The dynamic performance of proposed system was analyzed by simulation with PSCAD/EMTDC, assuming that the UPQC is connected with the 22.9kV distribution line. The proposed system can be directly connected to the transmission line without series injection transformers. It has flexibility in expanding the operation voltage by increasing the number of H-bridge modules and can compensate reactive power, harmonics, voltage sag and swell, voltage unbalance. The proposing UPQC has the ultimate capability of improving power quality at the point of installation on power distribution systems.

A Single-Phase Unified Power Quality Conditioner with a Frequency-Adaptive Repetitive Controller

  • Phan, Dang-Minh;Lee, Hong-Hee
    • Journal of Electrical Engineering and Technology
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    • v.13 no.2
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    • pp.790-799
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    • 2018
  • This paper proposes a single-phase unified power quality conditioner (S-UPQC) for maintaining power quality issues in a microgrid. The S-UPQC can compensate the voltage and current harmonics, voltage sag, and swell as a dynamic voltage restorer (DVR), regardless of variations in the grid frequency. Odd harmonics are treated as even-order harmonics in a rotating frame to implement the harmonic compensators with only one repetitive controller (RC) without any harmonic extractor. The dynamic performance is improved and the delay time is reduced in the RC. The S-UPQC control scheme is designed to maintain accurate and stable operation under deviations of the grid frequency by using the Lagrange interpolation-based finite-impulse-response (LIFIR) filter approximation method. The proposed control schemes were validated through a simulation and experiment.

Dynamic Performance Analysis of Unified Power Quality Conditioner with Cascaded H-Bridges (다중브리지로 구성된 UPQC(Unified Power Quality Conditioner)의 동적 성능분석)

  • Han, Byung-Moon;Soh, Yong-Cheol;Kim, Hyun-Woo
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.55 no.2
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    • pp.94-102
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    • 2006
  • This paper describes experimental analysis of UPQC, which is composed of cascaded H-bridges and single-phase multi-winding transformers. The operational characteristic was analyzed through experimental works with a scaled model, and simulations with PSCAD/EMTDC. The UPQC proposed in this paper can be directly connected to the distribution line without series injection transformers. It has flexibility to expand the operation voltage by increasing the number of H-bridge modules. The analysis results can be utilized to design the actual UPQC system applicable for the actual distribution system.

Unified Power Quality Conditioner for Compensating Voltage Interruption

  • Han, Byung-Moon;Cho, Bo-Hyung;Sul, Seung-Ki;Kim, Jae-Eon
    • Journal of Electrical Engineering and Technology
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    • v.1 no.4
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    • pp.503-512
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    • 2006
  • This paper proposes a new configuration for the Unified Power Quality Conditioner, which has a DC/DC converter with super-capacitors for energy storage. The proposed UPQC can compensate the reactive power, harmonic current, voltage sag and swell, voltage imbalance, and voltage interruption. The performance of the proposed system was analyzed through simulations with PSCAD/EMTDC software. The feasibility of system implementation is confirmed through experimental works with a prototype. The proposed UPQC has ultimate capability to improve the power quality at the point of installation on power distribution systems and industrial power systems.

Coordinated Control Strategies with and without Circulating Current in Unified Power Quality

  • Feng, Xing-tian;Zhang, Zhi-hua
    • Journal of Power Electronics
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    • v.15 no.5
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    • pp.1348-1357
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    • 2015
  • Under traditional unified power quality conditioner (UPQC) control, a UPQC series converter (SC) is mainly used to handle grid-side power quality problems while its parallel converter (PC) is mainly used to handle load-side power quality problems. The SC and PC are relatively independent. The SC is usually in standby mode and it only runs when the grid voltage abruptly changes. In this paper, novel UPQC coordinated control strategies are proposed which use the SC to share the reactive power compensation function of the PC especially without grid-side power quality problems. However, in some cases, there will be a circulating current between the SC and the PC, which will probably influence the compensation fashion, the compensation capacity, or the normal work of the UPQC. Through an active power circulation analysis, strategies with and without a circulating current are presented which fuses the reactive power allocation strategy of the SC and the PC, the composite control strategy of the SC and the compensation strategy of the DC storage unit. Both of the strategies effectively solve the SC long term idle problem, limit the influence of the circulating current, optimize all of the UPQC units and reduce the production cost. An analysis, along with simulation andexperimental results, is presented to verify the feasibility and effectiveness of the proposed control strategies.

Novel Control Strategy for a UPQC under Distorted Source and Nonlinear Load Conditions

  • Trinh, Quoc-Nam;Lee, Hong-Hee
    • Journal of Power Electronics
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    • v.13 no.1
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    • pp.161-169
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    • 2013
  • This paper proposes a novel control strategy for a unified power quality conditioner (UPQC) including a series and a shunt active power filter (APF) to compensate the harmonics in both the distorted supply voltage and the nonlinear load current. In the series APF control scheme, a proportional-integral (PI) controller and a resonant controller tuned at six multiples of the fundamental frequency of the network ($6{\omega}_s$) are performed to compensate the harmonics in the distorted source. Meanwhile, a PI controller and three resonant controllers tuned at $6n{\omega}_s$(n=1, 2, 3) are designed in the shunt APF control scheme to mitigate the harmonic currents produced by nonlinear loads. The performance of the proposed UPQC is significantly improved when compared to that of the conventional control strategy thanks to the effective design of the resonant controllers. The feasibility of the proposed UPQC control scheme is validated through simulation and experimental results.

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.