• Title, Summary, Keyword: Dynamic voltage restorer

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On-Line Type Dynamic Voltage Restorer System by Improvement of EDLC's energy utilization ratio (EDLC의 Energy이용 향상에 의한 On-Line type Dynamic Voltage Restorer System)

  • Shon, Jin-Geun;Park, Jong-Chan;Seo, Il-Dong;Jeon, Hee-Jong
    • Proceedings of the KIEE Conference
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    • pp.1099-1101
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    • 2007
  • In this paper, a study has been performed for development of dynamic voltage restorer(DVR) system using EDLC (Electric Double Layer Capacitor) to solve voltage sags which are considered the dominant disturbances affecting power quality. With the prolific use of semiconductor devices in electrical equipment, modern-day loads are becoming increasingly sensitive to the sags and the disturbances prove to be costly to industries. As a technology-driven custom power installation, the Dynamic Voltage Restorer (DVR) is recognized to be most effective equipment that can be used to counter the voltage sag problem. Hence, this paper proposes the high-performance optimal design of On-Line type DVR system which can efficiently compensate the instantaneous voltage sag and instantaneous interruption of the utility voltage source.

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Development of High-Performance Single-Phase Line-Interactive Dynamic Voltage Restorer (고성능 단상 선로응동형 DVR(Dynamic Voltage Restorer))

  • Bae, Byung-Yeol;Lee, Dong-Geun;Kwak, No-Hong;Park, Sang-Ho;Han, Byung-Moon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.11
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    • pp.1947-1954
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    • 2007
  • This paper describes the development of a high-performance single-phase line-interactive Dynamic voltage Restorer, which is composed of an H-bridge inverter and super-capacitors. The operational feasibility was verified through computer simulations with PSCAD/EMTDC software, and experimental works with 3kVA prototype. The developed system can compensates the input voltage sag and interruption within 2ms, in which the maximum allowable duration of voltage interruption is 1.5 seconds. It can be effectively used to compensate the voltage interruption in the sensitive load, such as computer, communication equipment, automation equipment, and medical equipment. The developed system has a simple structure to be easily implemented with commercially available components and to be highly reliable in operation.

Development of Three-Phase Line-Interactive Dynamic Voltage Restorer with Hybrid Detection Method (Hybrid 검출방식을 적용한 삼상 선로 응동형 DVR(Dynamic Voltage Restorer) 개발)

  • Jeong, Jong-Kyou;Han, Byung-Moon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.10
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    • pp.1954-1961
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    • 2009
  • This paper describes the development of a three-phase line-interactive dynamic voltage restorer with hybrid detection method, which is composed of three H-bridge inverter modules and super-capacitors. The operational feasibility was verified through computer simulations with PSCAD/EMTDC software, and experimental works with a 3kVA prototype. The developed system can compensate the input voltage sag and interruption within 2ms. The maximum allowable duration of voltage interruption is about 4 seconds. The developed system can be effectively used to compensate the voltage interruption in the sensitive load, such as computer, communication devices, and automation devices, and medical equipment. The developed system has a simple structure to be easily implemented with commercially available components, and to be highly reliable in operation.

The DC Link Energy Control Method of Dynamic Voltage Restorer System (DVR(Dynamic Voltage Restorer)에서의 직류에너지 제어 방법)

  • Jeong, Il-Yeop;Park, Sang-Yeong;Won, Dong-Jun;Mun, Seung-Il;Park, Jong-Geun;Han, Byeong-Mun
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.50 no.12
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    • pp.575-583
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    • 2001
  • Dynamic Voltage Restorer(DVR) which is installed between the supply and a critical load can restore voltage disturbances in distribution system. The restoration is based on injecting the same voltages as voltage sags. The ideal restoration is compensation to make the load voltages be unchanged. But voltage restoration involves real power or energy injection and the capability of energy storage is limited. So it must be considered how injection energy can be minimized and voltages can be made close to the voltages before fault. This paper describes conventional restoration techniques, which draw minimum energy from the DVR in order to correct a given voltage sag or swell. And this paper proposes a new concept of restoration technique to inject minimum energy. The proposed method is based on the definition of voltage tolerance in load side. Hence using the proposed method a particular disturbance can be corrected with less amount of storage energy compared to those of conventional methods.

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Performance Improvement of DC-link Control for a Dynamic Voltage Restorer with Power Feedforward Compensation (전력 전향보상을 통한 동적전압보상기 직류단 전압 제어의 성능 향상)

  • Ji, Kyun Seon;Jou, Sung Tak;Lee, Kyo-Beum
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.9
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    • pp.1297-1305
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    • 2015
  • This paper proposes a power feedforward technique for the performance improvement of DC-link voltage control in the dynamic voltage restorer (DVR). The DC-link Voltage is able to be unstable for an instant owing to any change in the load and voltage sag. The distortion of the DC-link voltage leads to the negative influence on the performance of DVR. To mitigate the distortion of the DC-link voltage, the power feedforward component is calculated by the load power and the grid voltage, and then it is added to the reference current of the conventional DC-link voltage controller. By including output power feedforward component on the DC-link controller, the DC-link voltage can settle down more quickly than when the conventional DC-link voltage controller applied. The proposed technique was validated through the simulation and experimental results.

Dynamic Voltage Restorer Control Using $H_{\infty}$ Algorithm ($H_{\infty}$ 알고리즘을 이용한 Dynamic Voltage Restorer의 제어)

  • Chun, Yeong-Han;Kim, Ji-Won;Jeon, Jin-Hong
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.50 no.12
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    • pp.561-565
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    • 2001
  • Recent trend of increasing automated factories needs supply of high quality power from the utilities. Among the items of the power quality, voltage sag can be compensated by Dynamic Voltage Restorer(DVR). The key feature of the DVR is high response with less transient period to recover from the voltage sag due to the lightning or line-to-ground faults. In this paper we report that $H_{\infty}$ controller is very promising for the practical application to the controller of DVR. Experimental results shown in this paper was obtained by applying the control algorithm to 20 kVA DVR system. The experimental set consists of IGBT-based three phase inverter and the TMS320C32-60 DSP used for main processor of the control board. To simulate the 50% voltage sag, the SCR-based experimental set was constructed.

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A Study on the Design of the Dynamic Voltage Restorer Prototype (Dynamic Voltage Restorer Prototype 설계에 관한 연구)

  • Kim, Ji-Won;Chun, Yeong-Han;Jeon, Jin-Hong;Oh, Tae-Kyoo;Park, Dong-Wook
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.50 no.3
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    • pp.140-145
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    • 2001
  • The instantaneous voltage drop is occurred when the fault is happened on the nearby feeders. The instantaneous voltage drop is continued during relatively short period. But, the effect of it can be very severe to some sensitive devices. That is, it can be the reason of restart or malfunction of some devices. And these phenomenons can cause the enormous economical damage and shorten the lifetime of the devices. In this paper, the device which can compensate the instantaneous voltage drop, is studied. Through the computer simulation using PSCAD/EMTDC, the validity of the control algorithm using peak detection method is verified. And the Dynamic Voltage Restorer(DVR) prototype is designed and constructed. Through the experiment, the function and performance of the DVR prototype is verified.

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Development of Single-Phase DVR(Dynamic Voltage Restorer) Composed of H-Bridge Inverter and SuperCapacitor (H-브리지 인버터와 수퍼커패시터로 구성된 단상 DVR(Dynamic Voltage Restorer)의 개발)

  • Lee, Dong-Geun;Lee, Doo-Young;Yang, Seung-Chul;Bae, Byung-Yeol;Han, Byung-Moon
    • Proceedings of the KIEE Conference
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    • pp.160-161
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    • 2007
  • This paper describes the development of a single-phase DVR(Dynamic voltage Restorer), which is composed of H-bridge inverter and super-capacitors. The operational feasibility was verified through computer simulations with PSCAD/EMTDC software, and experimental works with 3kVA prototype. The developed system can compensates the input voltage sag and interruption within 2ms, in which the maximum allowable duration of voltage interruption is 1.5 seconds. It can be effectively used to compensate the voltage interruption in the sensitive load, such as computer, communication equipment, automation equipment, and medical equipment. The developed system has a simple structure to be easily implemented with commercially available components and to be highly reliable in operation.

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Magnetic Flux Saturation Analysis of Matching Transformer Considering Characteristic of Dynamic Voltage Restorer(DVR) (DVR의 특성을 고려한 매칭변압기의 자속포화 해석)

  • Shon, Jin-Geun;Kim, Dong-Joon;Kang, Min-Gu;Jeon, Hee-Jong
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.57 no.3
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    • pp.236-243
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    • 2008
  • This paper analyses magnetic flux saturation of matching transformer considering characteristic of dynamic voltage restorer(DVR) system to solve voltage sags which are considered the dominant disturbances affecting power quality. This DVR consist of PWM inverter to inject arbitrary voltage, LC low pass filter and matching transformer for isolation and grid connection. However, the matching transformer has an excess of inrush current by magnetic flux saturation in the core of transformer. Due to this inrush current, the rating of matching transformers is double for needed nominal rating for protection of DVR. Therefore, in this paper, an advanced modeling method of magnetic flux saturation is used to analyze a magnitude and characteristic of magnetizing current. Simulation and experimental results considering characteristic of DVR system are provided to demonstrate the validity of the proposed analysis method.

Improvement of PLL Method for Voltage Control of Dynamic Voltage Restorer (동적전압보상기의 전압제어를 위한 PLL 방식의 개선)

  • Kim, Byong-Seob;Choi, Jong-Woo
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.5
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    • pp.936-943
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    • 2009
  • Dynamic voltage restorer(DVR) is now more preferable enhancement than other power quality enhancement in industry to reduce the impact of voltage faults, especially voltage sags to sensitive loads. The main controllers for DVR consists of PLL(phase locked loop), compensation voltage calculator and voltage compensator. PLL detects the voltage faults and phase. Compensation voltage calculator calculates the reference voltage from the source voltage and phase. With calculated compensation voltage from PLL, voltage compensator restores the source voltage. If PLL detect ideal phase, compensation voltage calculator calculates ideal compensation voltage. Therefore, PLL for DVR is very important. This paper proposes the new method of PLL in DVR. First, the power circuit of DVR system is analyzed in order to compensate the voltage sags. Based on the analysis, new PLL for improving transient response of DVR is proposed. The proposed method uses band rejection filter(BRF) at q-axis in synchronous flame. In order to calculate compensation voltage in commercial instruments, the PQR theory is used. Proposed PLL method is demonstrated through simulation using Matlab-Simulink and experiment, and by checking load voltage, confirms operation of the DVR