POWER QUALITY IMPROVEMENT OF WIND ENERGY (original) (raw)
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POWER QUALITY IMPROVEMENT OF WIND ENERGY CONVERSION SYSTEM USING UNIFIED POWER QUALITY CONDITIONER
iaeme
This paper presents a comparison between Unified Power Quality Conditioner UPQC controller and normal power converter to be used for DFIG control system. Implementation of unified power quality conditioner (UPQC) in wind energy conversion system (WECS) more performance improvement is observed than the normal power converter system. This work deals with two types of UPQC models which is developed for checking its control strategy validity in wind energy conversion system based Double fed induction generator (DFIG) since UPQC has the same structure of the DFIG converters . This paper mainly focuses on efficient control system of unified power quality conditioner that makes it possible to reduce the voltage fluctuations like sag and swell conditions, as well as current and voltage harmonics mitigation in wind energy conversion system. The UPQC which can be used at the PCC for improving power quality is modeled and simulated using proposed control technique and the performance is compared by applying it to a wind energy conversion system with UPQC and with normal power converter. With the help of MATLAB/SIMULINK environment Dynamic models of the DFIG and UPQC are developed.
The Unified Power Quality Conditioner Technique in Wind Energy Conversion System
2012
This paper deals with the using of unified power quality conditioner (UPQC) in wind energy conversion system (WECS) . it presents effect of UPQC on wind energy conversion system (WECS) through showing its active filter behavior due to the nature connection of the both power controllers which look like same structure with the normal power convertors of Double fed induction generator (DFIG) . This paper has represented a review paper for efficient control system for unified power quality conditioner that makes it possible to reduce the voltage fluctuations like sag and swell conditions, as well as current and voltage harmonics mitigation in wind energy conversion system. The UPQC which can be used at the PCC for improving power quality is modeled and simulated using proposed control technique and the performance is compared by applying it to a wind energy conversion system with UPQC and without UPQC. With the help of MATLAB/SIMULINK environment Dynamic models of the DFIG and UPQC are ...
A Study of Unified Power Quality Conditioner in Wind Energy Conversion System
2018
ABSTRACT: Wind energy is one of the most efficient as well as cost effective renewable energy resources for generating electricity compared to other conventional types of energy resources. When wind energy source is integrated to the existing power system, various power quality issues arise at different level of power system. To overcome these problems, here a unified power quality conditioner (UPQC) in wind energy conversion system (WECS) is used. In Unified Power Quality Conditioner (UPQC) a series active filter and a shunt active filter are connected in a back-toback configuration to simultaneously compensate the problems due to voltage distortion, voltage unbalances and to compensate harmonics produced due to current.
Abstract-The Unified Power Quality Controller (UPQC) device is an integration of a series active filter and a shunt active filter. The main purpose of a UPQC is to compensate for voltage flicker, reactive power, and harmonics. It has the capability of improving power quality at the point of installation on power distribution systems or industrial power systems. This paper utilizes the UPQC to enhance the low-voltage ride-through (LVRT) capability of the doubly fed induction generator (DFIG)-based wind energy conversion system (WECS) according to the grid connection requirement. UPQC is applied to protect the system from ground faults, allows fast restoring of generation system steady state characteristics, improves the system power factor, and prevent the system from rotor over-current and dc-link overvoltage. A comparison between the LVRT results using the UPQC and the results when using STATCOM or DVR is also presented.
Power Quality Improvement in DFIG based Wind Energy Conversion System using UPFC
The wind energy generation, utilization and its grid penetration in electrical grid are increasing worldwide. The wind generated power is always fluctuating due to its time varying nature and causing stability problem. Unified Power Flow Controller (UPFC) is used to control the power flow in the transmission systems by controlling the impedance, voltage magnitude and phase angle. This controller offers advantages in terms of static and dynamic operation of the power system. A Unified Power Flow Controller (UPFC) is an electrical device for providing fast-sensation on high-voltage electricity transmission networks. UPFC uses a pair of threephase controllable bridges to produce current that is injected into a transmission line using a series transformer. The controller can control active and reactive power flows in a transmission line. The UPFC is a combination of a static synchronous compensator (STATCOM) and a static synchronous series compensator (SSSC) coupled via a common DC voltage link. The main scope of this paper involves in simulation of DFIG based wind energy conversion system with UPFC using MATLAB/ SIMULINK.
Power Quality Improvement by using STATCOM for DFIG based Wind Energy Conversion System
Power quality is a major issue in WECS employing induction generators. Fluctuations in voltage profile and frequency are severe issues due to variations in likely conditions such as wind speed and load variation. In this research, during grid fault, sudden transients and variable wind speed, a comprehensive study of DFIG based wind farm employing self-frequency converters and along with STATCOM is presented. Furthermore, various PQ issues like voltage sag, current harmonics are investigated and such issues are suppressed by employing STATCOM for grid connected WECS. A FLC based strategy is employed to enhance the performance of STATCOM that reduce the disadvantages of employing fixed gains in PI and fuzzy logic controller. By inspecting the simulation results and controller presentations, we have found that the presented technique improves the PQ by mitigating both the voltage sag and current harmonics efficiently and with a better reliability. KeywordsPower Quality Enhancement, Fuz...
Wind Energy Fed UPQC System for Power Quality Improvement
Bulletin of Electrical Engineering and Informatics
The extensive use of non-linear loads in domestic, industrialand commercial services origin harmonic complications.Harmonics make malfunctions in profound equipment, voltage drop across the network, conductor heat increases and overvoltage through resonance. All these problems can be remunerated by using Unified Power Quality Controller (UPQC) and the operation of UPQC depends upon the available voltage across capacitor present in dc link. If the capacitor voltage is maintained constant then it gives satisfactory performance. The proposed research is basically on designing of Wind energy fed to the dc link capacitor of UPQCso as to maintain propervoltageacross it and operate the UPQC for power quality analysis. The proposed technique is the grouping of shunt and series Active Power Filter (APF) to form UPQC which is fed wind energy system and connected to grid for better response in the output. In this paper, the simulation model of series APF, shunt APF, UPQC and Wind energy with U...
This study proposes a combined operation of the Unified Power Quality Conditioner (UPQC) with wind power generation system considering investment cost. The proposed system consists of a series inverter, a shunt inverter, and an induction generator connected in the dc link through a converter. The proposed system can compensate voltage sag and swell, voltage interruption, harmonics, and reactive power in both interconnected mode and islanding mode. The speed of the induction generator is controlled according to the variation of the wind speed in order to produce the maximum output power. The investment cost of proposed system is compared with investment cost of separated use of UPQC and Wind Energy Conversion System (WECS) and the economic saving due to use of proposed system is estimated. The validity of the proposed system is verified by the results of computer simulation.
Iet Renewable Power Generation, 2009
The ability of wind generation to remain connected to the grid in the event of system faults and dynamic reactive power compensation are two aspects of grid integration, which have received particular attention. The wind driven, fixed-speed induction generator (FSIG) on its own fails to fulfil these requirements of grid integration. The application of a unified power quality conditioner (UPQC) to overcome the grid integration problems of the FSIG is investigated. The role of the UPQC in enhancing the fault ride-through capability of the generator is also investigated under both full and partial terminal voltage restoration. A realistic estimation of the rating requirements of UPQC for this type of application is carried out. A general principle is presented to choose the most practical and economical rating of the UPQC. The performance comparison of a UPQC and a static synchronous compensator to aid fault ride-through capability of a 2 MW FSIG under Irish grid code requirements has been carried out and the UPQC is found to be more economical in relation to device rating. deals with the results and discussion and conclusions of the work are provided in Section 7.