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Fuzzy Controlled Ultra-Capacitor Based DVR (UCAP-DVR) for Power Quality Enhancement

Circuits and Systems 2016年第13期7卷 4098-4112页

作者： R. Bhavani Dr. N. Rathina Prabha Department of Electrical and Electronics Engineering Mepco Schlenk Engineering College Sivakasi India

In recent years, a rapid decrease in the cost of various energy storage technologies and their integration into grid becomes a reality with the advent of smart grid. The Dynamic voltage Restorer (DVR) is a custom power device that has an excellent dynamic capability used to provide voltage sag, swell compensation in distribution systems. Among the energy storage devices, Ultra-Capacitors (UCAP) have ideal characteristics such as high power and low energy density essential for the compensation of voltage sag and swell, which require high power for short interval of time. This paper presents an integration of rechargeable UCAP with DVR. This UCAP-DVR presents a modular, flexible system configuration that will have an active power capability and also provide deep, extended mitigation for power quality problems. The DVR is integrated into UCAP via bidirectional DC-DC converter which supports a rigid dc-link voltage for DVR and also helps in compensating temporary voltage sag and swell. FUZZY LOGIC Controller is used to enhance the performance of UCAP-DVR. The simulation model for the proposed system has been developed in MAT-LAB and the performance over conventional DVR is compared with the results obtained.

关键词： Dynamic voltage Restorer (DVR) Ultra-Capacitor (UCAP) DC-DC Converter voltage Sag voltage swell Fuzzy Logic Controller (FLC)

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Investigation of Interline Dynamic voltage Restorer with Virtual Impedance Injection

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Journal of Energy and Power Engineering 2012年第1期6卷 101-109页

作者： Ahmed Elserougi Ahmed Hossam-Eldin Ahmed Massoud Shehab Ahmed Electrical Engineering Department Alexandria University Alexandria 21526 Egypt Electrical and Computer Engineering Department Qatar University Doha 23874 Qatar Electrical and Computer Engineering Department Texas A＆M University at Qatar Doha 23874 Qatar

The inter-line dynamic voltage restorer （IDVR） consists of several voltage source inverters connected to different independent distribution feeders with common dc bus. When one of the inverters compensates for voltage sag that appears in its feeder （voltage control mode）, the other inverters pump the required power into the dc bus （power control mode）. Each inverter will have both voltage and power controllers; only one controller is in use during the abnormal conditions according to its feeder state. The voltage controller uses one of the dynamic voltage restoration techniques. In this paper, the in-phase technique is applied and two types of loads are considered （constant impedance and three phase induction motor）. Since the voltage restoration process may need real power injection into the distribution system, the power controller injects this power via voltage injection. This voltage injection is simulated by voltage drop across series virtual impedance. A new scheme is proposed to select the impedance value. The impedance value is selected such that the power consumed by this impedance represents the required power to be transferred without perturbing the load voltage. The performance of this system is also studied during voltage swell. A scheme for operation of multi-feeder IDVR system is proposed in this paper. Simulation results substantiate the proposed concept.

关键词： Dynamic voltage restorers IDVR voltage sag voltage swell power quality.

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Realization of Unified Power Quality Conditioner for Mitigating All voltage Collapse Issues

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Circuits and Systems 2016年第6期7卷 779-793页

作者： Parthasarathy Pugazhendiran Jeevarathinam Baskaran Department of Electrical and Electronics Engineering IFET College of Engineering Villupuram India Department of Electrical and Electronics Engineering Adhiparasakthi College of Engineering Melmaruvathur India

This paper proposes about a powerful control mechanism of UPQC (Unified Power Quality Conditioner) work on voltage source inverter which can effectively compensate source current harmonics and also mitigate all voltage collapse such as dip, swell, voltage unbalances and harmonics. The consolidation of series and parallel active power filters sharing mutual DC bus capacitor forms UPQC. PI (Proportional Integral) controller is mainly used in order to maintain continual DC voltage along with the hysteresis current controller. The parallel and series power filters were designed using 3-phase voltage source inverter. The reference signals for shunt and series active power filters were obtained by Synchronous Reference Frame (SRF) theory and Power Reactive (PQ) theory respectively. By using these theories, reference signals were obtained which was fed to the controllers for generating switching pulses for parallel and series active filters. The UPQC dynamic performance is obtained through testing terms like the compensation of voltage, current harmonics and all voltage distortion associated with 3-phase 3-wire power system which is simulated using MATLAB-Simulink software.

关键词： Power Quality Conditioner voltage Sag (Dip) voltage swell Current Harmonics Mitigation Power Quality Improvement

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Application of Dynamic Time-frequency Analysis for Power Quality Event Classification and Recognition

Application of Dynamic Time-frequency Analysis for Power Qua...

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2009中国控制与决策会议

作者： Huang Weili,Du Wei Hebei University of Engineering,Handan 056038,China

＜正＞The power quality issues have emerged as an important research field for electric market and *** power quality disturbances and the resulting problems are the consequences of the increasing use of solid state switching devices,nonlinear and power electronically switched loads,unbalanced power systems and data processing equipment,as well as industrial plant rectifiers and inverters.A novel approach based on wavelet transformation with neural network is presented to investigate the voltage swell fault,which can acquire the qualitative and quantitative *** advantage of the wavelet transformation is in achieving flexible frequency resolution,thus making it able to extract both high-frequency and low-frequency components from the power quality *** means of signal singularity detection analysis,the wavelet transformation can accurately detect and locate the transient voltage *** improved training algorithm is utilized to complete the neural network parameters initialization and classification performance, and the main component of the transient signal is obtained from the power quality disturbance with four-level *** order to satisfy power system observation,the power quality monitor configuration method is *** effectiveness of the proposed approach was ascertained using power quality disturbance with simulation analysis.

关键词： Power quality disturbance wavelet transformation voltage swell neural network singularity detection power quality monitor configuration method

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