When both these active power filters are combined then the combination is known as unified power quality conditioner. Introduction electricity is the most famous form of energy which becomes compromised due to power quality problems. Power quality improvement of wind energy conversion system. Regarding to this power quality issues there is a many compensating devices. Due to continuous use of the nonlinear loads the voltage and current waveform shows the distortions. The design of upqc connected to three phase four wire system 3p4w. Unified power quality conditioner,series active power filter,shunt active power filter,power quality introduction electrical power system is design to provide high quality power for satisfactory operation of various electrical equipment. Interline unified power quality conditioner iupqc, specifically aims at the integration of series vsc and shunt vsc to provide high quality power supply by means of voltage sagswell compensation, harmonic elimination and power factor correction in a power distribution network, so that improved power quality can be made available at the. Instantaneous power theory and applications to power conditioning, second edition. Dvr is dynamic voltage restorer and is used for improving voltage profile of line. Introduction power quality has gained significant attention in the past few years. Akagi, 1996, to improve the power system condition and has gone through many modifications to improve the performance. In this context, many electrical generation hybrid system frequently combine solar and wind energy sources. Introduction the important factors to be considered in power quality measurement are the active power, reactive power, variation of voltage and current, flicker, harmonics, and electrical behaviour of switching.
This system has an advantage that it has only one storage device compared to. Upqc provides the var requirement of the load, so that the supply voltage and current are always in phase. The power components power and quality are related to the same alpha and beta voltages and currents, and can be written together. A new unified power quality conditioner for grid integration. The upqc system can enhance the power quality in distribution system at the point of common. Simulation of unified power quality conditioner for. The design configuration is based on the connection of series and shunt inverters.
Now days a new concept of custom power is used for omers satisfactioncust. So to improve power quality of a system we use different devices such as active power filters. Unified power quality conditioner upqc sciencedirect. Unfortunately, the upqc cannot provide power quality solutions for multibusmultifeeder distribution systems. Such equipment, always known as active power filters apfs, and are also called active power line conditioners aplcs, instantaneous reactive power compensators irpcs, active. One of the best solution for these all power quality issues i. Combined series and shunt active filters are known as unified power quality conditioner. Unified power quality conditioner,series active power filter,shunt active power filter, power quality introduction electrical power system is design to provide high quality power for satisfactory operation of various electrical equipment. Harmonic distortion and phase unbalance can combine to overstress motors. Unified power quality conditioner upqc using matlab. These quantities are illustrated for an electrical system represented in abc coordinates. Among them upqc is the most different and efficient device which was introduced in 1991.
Design of unified power quality conditioner upqc to improve. Pdf power quality improvement by unified power quality. Srfbased control of unified power quality conditioner for. Pdf merger and combiner report inappropriate project. The unified power quality conditioners upqcs consist of combined series. The upfc is employed in power transmission system, where as the upqc is employed in a power distribution system.
Unified power quality conditioner upqc for nonlinear and a voltage sensitive load has following facilities. Improvement of unified power quality conditioner based on. When the power system is nonlinear then d and q axis currents ii. Active power filter apf, harmonic compensation, power quality, unified power quality conditioner upqc, custom power devices. A unified power quality conditioner upqc is a device that is similar in construction to a unified power flow conditioner upfc. Power quality the quality of electrical power supply is a set of parameters which describe the process of electric power delivery to the user under normal operating conditions, determine the continuity of supply short and long supply interruption.
Unified power quality conditioner upqc is one of the custom. With this topology it is possible to obtain high efficiency and combine the. Performance analysis of unified power quality conditioner for. In order to overcome the pq related problems, a unified power quality conditioner. Fuzzy logic controlled unified power quality conditioner. Every ferroresonant power conditioner is manufactured to exacting specifications and is subject to rigorous quality control. Optimal location of unified power quality conditioner in. Unified power quality conditioner for improving power quality. Active power filters are classified into two types that is shunt active power.
In this, the design configuration is right series and left shunt with the current source converter csc 3, 4. This paper presents a design of a unified power quality conditionerright upqcr connected to threephase fourwire system3p4w will makes the neutral. A threephase unified power quality conditioner upqc with cross phase. A power conditioner also known as a line conditioner or power line conditioner is a device intended to improve the quality of the power that is delivered to electrical load equipment. Control of interline unified power quality conditioner for. Upqcs combine the functions of a dvr and dstatcom 6, and eliminates harmonics, voltage sag, and. Power quality conditioner upqc is a facts device that is used in the distribution system to mitigate the disturbances that affect the performance of sensitive andor critical loads. Spd, power conditioning, pf capacitors and harmonic filters 2. In this era of industrialization, the power quality is important for any. Request pdf control strategy of a crossphaseconnected unified power quality. Power quality pq mainly deals with issues like maintain a fixed voltage at.
Unified power quality conditioner for enhancement of. A modified control method for a dual unified power quality. Department of eee, don bosco institute of technology. The term most often refers to a device that acts in one or more ways to deliver a voltage of the proper level and characteristics to enable load equipment to function properly. Abstract due to vast implementation of power electronics based equipment power quality has turned into essential and important factor. This distorted waveform produces quality issues in the distribution system. Keywords power quality, harmonic distortion, voltage sag, pwm converter 1. Unified power quality conditioner in grid connected. A new control strategy is proposed to the control algorithm for series apf is based on unit vector template generation to compensate the current unbalance present in the load. V3t22 volume 3power distribution and control assemblies ca0804edecember 2018. Spd, power conditioning, pf capacitors and harmonic filters. Power quality pq mainly deals with issues like maintain a. Hybrid fuzzy backpropagation control scheme for multilevel unified.
Power quality the quality of electrical power supply is a set of parameters which describe the process of electric power delivery to the user under normal operating conditions, determine the continuity of supply short and long supply interruptions and characterize the supply voltage magnitude. Unified power quality conditioner for improving power quality using ten switch inverter 1 s. The main purpose of a upqc is to compensate for voltage imbalance, reactive power, negativesequence current and harmonics. The main purpose of a upqc is to compensate for voltage imbalance, reactive power. The device is connected between two feeders coming from different substa tions. A survey on unified power quality conditioner for power. Now a days power electronics based appliances are widely used in industries and in distribution system which creates more power quality problems. Pdf srfbased control of unified power quality conditioner. It aims at the integration of seriesactive and shuntactive power filters. Design of unified power quality conditioner upqc for power.
Power quality conditioners a power conditioner also known as a line conditioner or power line conditioner is a device intended to improve the quality of power that is delivered to electrical load equipment. Unified power quality conditioner upqc unified power quality conditioner is a power electronic circuit which is an integration of shunt and series invertors and because of that it can handle any fluctuation when connected to the load. Simulation of unified power quality conditioner should be done in matlab. Power quality enhancement by unified power quality. Simulation of combine series and shunt apf controller. Unified power quality conditioner is an advanced concept in the area of power quality control. Velumani 1 pg scholar, 2assistant professor, 3 pg scholar 1 department of electrical and electronics engineering, 1 sona college of technology, salem, tamilnadu, india.
Akagi, 1996, to improve the power system condition and has gone through many. It is important to emphasize that the existing upqc topologies does not have this capability. The proposed control algorithm for series and shunt converters based on flc and synchronous reference frame theory respectively. The advancement in the semiconductor device technology has made it possible to realize most of the power. Improvement of unified power quality conditioner 27 control a three phase three wire voltage source active power filter instead of pi controller. Conditioner introduction unified power quality conditioners upqcs allow the mitigation of voltage and current disturbances that could affect sensitive electrical loads while compensating the load reactive power.
The paper illustrates the operation and control of an interline unified power quality conditioner iupqc. The distribution system, have numerous nonlinear loads, which severely affect the quality of power supplies. In upqc, the transmitted power can be controlled by changing three parameters namely transmission magnitude voltage, impedance and phase angle. Power quality management using unified power quality. Introduction global deregulation of power markets, increased customer awareness and the increasing. Power conditioning equipment for improvement of power quality. Unified power quality conditioner upqc there are to voltage source inverters in upqc, they are connected back to back with a common dc link. In a powers system network there are many problems related to power quality.
Mitigation of power quality problems with reduced switches using unified power quality conditioner. The power electronics based power conditiones ing devic can be an effective solutionto improve power quality in power system. The upqc, like a upfc, employs two voltage source inverters vsis that are connected to a common dc energy storage capacitor. They excel at tightly regulating the voltage, providing superior noise attenuation and are. An unbalanced and nonlinear load l1 is supplied by feeder1 while a sensitive load l2 is supplied through feeder 2. A three phase four wire system is analysed in simulink with different. Power quality is one of the major problems in the todays scenario. Pdf integration of upqc for power quality improvement in.
Abstract power quality is the hot issue in the power world. Unified power quality conditioner upqc in alleviation of. Keywords dual unified power quality conditioner iupqc, active and reactive power control, power quality problems, coordinate transformation. However the extensive use of nonlinear loads in modem power system is becoming highly vulnerable to. The upqc is similar in construction to a unified power flow controller upfc 9. Performance analysis of unified power quality conditioner. The loadreactive power compensation in most of the upqc based power quality compensation application is done by shunt apf, whereas, the series apf. The ferroresonant power conditioners protect equipment from all power problems, other than the complete loss of power. Mitigation of power quality problems using unified power. Active powers filter apf, power angle control, power quality, reactive power compensation, unified power quality conditioner upqc. It eliminates the harmonics in the supply current, thus.
Simulation of unified power quality conditioner should be done in. Unified power quality conditioner upqc in alleviation of power quality issues. Some come from your local utility company, but most are created within your own facility as a result of the distribution. Power conditioning equipment for improvement of power. Pq related problems, a unified power quality conditioner upqc, by using series and shunt active power filters has been proposed to mitigate voltage and current imperfections in a singlefeeder distribution system. For the system considered in the present paper, the determination of n f is shown in table 1.
The shunt and series active filter performs the simultaneous elimination of current and voltage problems. In this paper a upqc controlled by srf theory is used to compensate current harmonics and voltage distortion in line due to nonlinear loads and fault conditions. Unified power quality conditioner upqc inverteri compensates for sag through a tuned filter and voltage transformer inverterii slcvc synchronous link converter var compensator provides var to the load, isolates load current harmonics, makes input power factor unity slcvc maintains the charge of the dc link capacitor low pass filter. Design of unified power quality conditioner upqc for power quality improvement in. Control strategy of a crossphaseconnected unified power quality. May 09, 2015 power quality conditioners a power conditioner also known as a line conditioner or power line conditioner is a device intended to improve the quality of power that is delivered to electrical load equipment. This paper presents a design of a unified power quality conditioner upqc to improve the power quality problems by using pq theory. In the present paper, a unified power quality conditioner fed by solar energy which can also export active power to the grid is proposed. Keywords power quality pq, unified power quality conditioner upqc, inverter, power flow controller pfc, series and shunt converter i. This paper deals with unified power quality conditioner upqc, which aims at the integration of seriesactive and shuntactive power filters.
Guna sekar me power electronics and drives, department of eee, kongu engineering collegeperundurai assistant professor, department of eee, kongu engineering collegeperundurai abstract. The neutral of series transformer used in the fourth wire for the 3p4w system. Sola power conditioners natural power solutions power. The research paper published by ijser journal is about control of interline unified power quality conditioner for power quality disturbances using simulink 9. The controller comprises of two threelayer feed forward ann. Design of interline unified power quality conditioner for. Unified power quality conditioner upqc that allows the connection of a photovoltaic panel to the grid without increase the number of power electronic converters. The unified power quality conditioner upqc is a facts device that is used in the distribution system to.
The proposed upqc is based on an imc, providing a dc link to connect the panel, through an inductive filter. This paper deals with the performance of unified power quality conditioner upqc based on current source converter csc topology. The simulation result is verified using matlabsimulink. This paper discusses the compensation principle and control strategy of the upqc in detail. Constant frequencyunified power quality conditioner. Unified power quality conditioner upqc system model and adjustable solutions to the power quality issues. It eliminates the harmonics in the supply current, thus improves utility current quality for nonlinear loads. Jun 11, 2014 the unified power quality conditioner is commonly called upqc. The aim of a unified power quality conditioner upqc that. Pdf mitigation of power quality problems with unified power. Enhancing electric power quality using dual unified power. Mitigation of power quality problems with reduced switches using unified power quality conditioner g. The control techniques for active filters have been successfully merged with a flexible ac transmission systems facts. These voltage sags affects the power quality and often results in financial loss.
It is the only versatile device which can mitigate several power quality problems related with voltage and current both. Design of unified power quality conditioner upqc to. Unified power quality conditionerupqc there are to voltage source inverters in upqc, they are connected back to back with a common dc link. The deterioration of the secured level of power quality has gained significant attention in the past few years. The connection to the grid is made by a series transformer.
The basic working principle of unified power quality conditioner is based on series active filter and parallel active filter power converters that share a common dc link l. Improvement of power quality using dual control strategy of unified. In this is paper a broad overview on the different possible intelligent controls is given which is used with upqc. Combined series and shunt power conditioners instantaneous. By integrating power electronic convertersbased custom power devices in supply undistorted high quality power to sensitive loads in industrials or commercial centers. Unified power quality conditioner upqc is the most promising. Unified power quality conditioner for improving power. With the increase in use of advanced power electronics and computer controlled devices in distribution system, problems due to power quality events such as the voltage sag and swell, harmonics generation are increasing. The unified power quality conditioner plays an important role in the constrained delivery of electrical power from a source to an isolated pool of load or from a source to the grid.
Pdf design and simulation of a unified power quality conditioner. The power quality has become one of the most significant issues for power electronics. Fuzzy logic controlled unified power quality conditioner for. The unified power quality conditioner upqc aims at integrating both shunt and series apfs through a common dc link capacitor. Chu 2004, unified power quality conditioner for improving power quality using ann with hysteresis control, in proc. Power quality improvement by unified power quality. Power quality improvement of wind energy conversion. We can use dc capacitor bank, fuel cell, pvarray, flywheel, supercapacitor, etc. Mitigation of power quality problems with reduced switches. One of the inverters is controlled as a variable voltage source in series apf and the other as variable current source in shunt apf. Unified power quality conditioner based on an indirect. Upqc is used to mitigate the power quality problems like harmonics and sag.
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