This paper presents a new unified power quality conditioning system mcupqc, capable of. Performance analysis of unified power quality conditioner for. Unified power quality conditioner for improving power quality using ten switch inverter 1 s. 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. Power quality pq, unified power quality conditioner upqc, voltagesource converter vsc. Akagi, 1996, to improve the power system condition and has gone through many. The upqc, like a upfc, employs two voltage source inverters vsis that are connected to a common dc energy storage capacitor. Pdf power quality enhancement using custom power devices pp 379406 cite as. Power quality improvement by unified power quality conditioner. Unified power quality conditioner upqc in alleviation of.
Unified power quality conditioner upqc in alleviation of power quality issues. Power quality is one of the major problems in the todays scenario. Realization of multi converter using unified power quality conditioning system 1g. Introduction electricity is the most famous form of energy which becomes compromised due to power quality problems. Power quality management using unified power quality. 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. Download link is provided and students can download the anna university ee6005 power quality pq syllabus question bank lecture notes syllabus part a 2 marks with answers part b 16 marks question bank with answer, all the materials are listed below for the students to make use of it and score good maximum marks with our study materials. Power quality enhancement by unified power quality. Akagi, 1996, to improve the power system condition and has gone through many modifications to improve the performance. These quantities are illustrated for an electrical system represented in abc coordinates. This distorted waveform produces quality issues in the distribution system. Design of unified power quality conditioner upqc for power quality improvement in. The newly proposed control technique involves a dual analysis of the upqc where the parallel compensator is modelled as a sinusoidal controlled.
A unified power quality conditioner upqc is a device that is similar in construction to a unified power flow conditioner upfc. The electrical utility may define power quality as reliability. When the power system is nonlinear then d and q axis currents ii. To supply power to the module either a regular or a power supply with builtin redundancy can. It consists of shunt and series converters connected back to back to a common dc link. A new unified power quality conditioner for grid integration.
Velumani 1 pg scholar, 2assistant professor, 3 pg scholar 1 department of electrical and electronics engineering, 1 sona college of technology, salem, tamilnadu, india. Fuzzy logic controlled unified power quality conditioner for. The paper illustrates the operation and control of an interline unified power quality conditioner iupqc. The power components power and quality are related to the same alpha and beta voltages and currents, and can be written together. Unified power quality conditioner upqc there are to voltage source inverters in upqc, they are connected back to back with a common dc link. Power quality pq, unified powerquality conditioner upqc, voltagesource converter vsc. This project presents a new unified power quality conditioning system mcupqc, capable of simultaneous compensation for voltage and current in multibusmultifeeder systems. Unified power quality conditioner for improving power. Active power filter apf, harmonic compensation, power quality, unified power quality conditioner upqc, custom power devices. Modelbased control of upqc has attracted attentions in recent years, which aims to regulate the source current and the load voltage to the desired reference signals in spite of the existence of harmonic components in the supply voltage and the load current, possible sag or swell in the supply voltage.
The electrical utility may define power quality as reliability and state that the system is 99. In this, the design configuration is right series and left shunt with the current source converter csc 3, 4. Combined series and shunt active filters are known as unified power quality conditioner. Design of interline unified power quality conditioner for. Unified power quality conditioner upqc using matlab. This paper deals with the performance of unified power quality conditioner upqc based on current source converter csc topology. One of the inverters is controlled as a variable voltage source in series apf and the other as variable current. The unified power quality conditioner upqc aims at integrating both shunt and series apfs through a common dc link capacitor. Power quality improvement by unified power quality. Upqc is one of the best custom power device used to compensate both source and load side problems. It is important to emphasize that the existing upqc topologies does not have this capability. The upfc is employed in power transmission system, where as the upqc is employed in a power distribution system. Power quality pq mainly deals with issues like maintain a fixed voltage at. Active power filters are classified into two types that is shunt active power filter apf and series active power filter apf and combination of both is known as upqc unified power quality conditioner.
The distribution system, have numerous nonlinear loads, which severely affect the quality of power supplies. This paper outlines a new approach for the compensation of power systems presented through the use of a unified power quality conditioner upqc which compensates impulsive and oscillatory electromagnetic transients. Realization of multi converter using unified power quality. It aims at the integration of seriesactive and shuntactive power filters. A modified control method for a dual unified power quality. 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. Pdf ee6005 power quality pq books, lecture notes, 2marks. Abc reference frame, classical control theory is used in this control method.
Mcupqc is a new connection for a unified power quality conditioner upqc, capable of simultaneous compensation for voltage and current in. Here we have done simulation of shunt active power. Mitigation of power quality problems with reduced switches. The newly proposed control technique involves a dual analysis of the upqc where the parallel compensator is modelled as a sinusoidal controlled voltage source, while the series. The neutral of series transformer used in the fourth wire for the 3p4w system.
A unified power quality conditioner upqc is a device that is similar in. Optimal location of unified power quality conditioner in. Unified power quality conditioner upqc is the most promising. Pdf power quality improvement by 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.
A survey on unified power quality conditioner for power. Unified power quality conditioner upqc for nonlinear and a voltage sensitive load has following facilities. This paper presents a new approach to design unified power quality conditioner upqc, termed as distributed upqc dupqc, for smart or. Dvr is dynamic voltage restorer and is used for improving voltage profile of line. The unified power quality conditioner is commonly called upqc. Unified power quality conditioner in grid connected.
New applications approach to unified power quality. Due to continuous use of the nonlinear loads the voltage and current waveform shows the distortions. Pdf srfbased control of unified power quality conditioner. 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. Unified power quality conditioner is an advanced concept in the area of power quality control. For more information on inter line unified power quality conditioner project and paper presentation visit. This paper presents a new unified powerquality conditioning system mcupqc, capable of. Spd, power conditioning, pf capacitors and harmonic filters. Jun 11, 2014 the unified power quality conditioner is commonly called upqc.
Pac method aims at effective utilization of series and shunt apfs by sharing reactive power burden between the two. It eliminates the harmonics in the supply current, thus. Unified power quality conditioner upqc is one of the custom. Keywords power quality pq, unified power quality conditioner upqc, inverter, power flow controller pfc, series and shunt converter i. So to improve power quality of a system we use different devices such as active power filters. Mitigation of power quality problems with reduced switches using unified power quality conditioner g. 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. 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. An unbalanced and nonlinear load l1 is supplied by feeder1 while a sensitive load l2 is supplied through feeder 2. Electrical project on unified power quality conditioner upqc. Sola power conditioners natural power solutions power. 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. This paper deals with unified power quality conditioners upqcs, which aim at the integration of seriesactive and shuntactive power filters. When both these active power filters are combined then the combination is known as unified power quality conditioner.
Power quality improvement using interline unified power quality conditioner conference paper pdf available may 2011 with 1,871 reads how we measure reads. Capacity enhancement and flexible operation of unified power. In upqc, the transmitted power can be controlled by changing three parameters namely transmission magnitude voltage, impedance and phase angle. This paper presents a design of a unified power quality conditioner upqc to improve the power quality problems by using pq theory. 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. Enhancing electric power quality using dual unified power. Pdf a control strategy for unified power quality conditioner. In a powers system network there are many problems related to power quality. Active power filters are classified into two types that is shunt active power.
This control strategy is used in threephase threewire systems find, read. 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. Constant frequencyunified power quality conditioner. Model predictive control of unified power quality conditioner. 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. The design configuration is based on the connection of series and shunt inverters.
Pdf power quality improvement using interline unified. Unified power quality conditioner for power quality improvement with. Design of unified power quality conditioner upqc for power. Pdf this paper deals with unified power quality conditioner upqc, which aims at the integration of seriesactive and shuntactive power filters. Keywords dual unified power quality conditioner iupqc, active and reactive power control, power quality problems, coordinate transformation. Poor power quality can result in maloperation of the equipment. The ferroresonant power conditioners protect equipment from all power problems, other than the complete loss of power. The main purpose of a upqc is to compensate for voltage imbalance, reactive power. 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. An advanced control approach for power quality compensation using unified power quality conditioner upqc is presented in this paper. In this era of industrialization, the power quality is important for any. We can use dc capacitor bank, fuel cell, pvarray, flywheel, supercapacitor, etc. Spd, power conditioning, pf capacitors and harmonic filters 2. Multi converter unified power quality conditioning mc.
The simulation result is verified using matlabsimulink. The device is connected between two feeders coming from different substa tions. In upqc, shunt apf is overburdened when it alone supplies total load reactive power. The upqc is similar in construction to a unified power flow controller upfc 9. 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. Unified power quality conditioner upqc during voltage sag and swell. However the extensive use of nonlinear loads in modem power system is becoming highly vulnerable to. Among them upqc is the most different and efficient device which was introduced in 1991. The design of upqc connected to three phase four wire system 3p4w. In this is paper a broad overview on the different possible intelligent controls is given which is used with upqc.
This article is presented new control approaches for both series and shunt inverter. Multi converter unified power quality conditioner mcupqc is one of the new power electronics devices that are used for enhancing the pq. Now a days power electronics based appliances are widely used in industries and in distribution system which creates more power quality problems. An improved control method for unified power quality. Simulation of unified power quality conditioner should be done in matlab. Every ferroresonant power conditioner is manufactured to exacting specifications and is subject to rigorous quality control. Unified power quality conditioner for improving power quality. Pdf this paper presents a control strategy for a unified power quality conditioner.
Unified power quality conditionerupqc there are to voltage source inverters in upqc, they are connected back to back with a common dc link. They excel at tightly regulating the voltage, providing superior noise attenuation and are. 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 loadreactive power compensation in most of the upqc based power quality compensation. Abstract due to vast implementation of power electronics based equipment power quality has turned into essential and important factor. Introduction power quality is the quality of the electrical power supplied to electrical equipment. Design of unified power quality conditioner upqc to. Guna sekar me power electronics and drives, department of eee, kongu engineering collegeperundurai assistant professor, department of eee, kongu engineering collegeperundurai abstract. Pdf unified power quality conditioner upqc during voltage. Design of unified power quality conditioner upqc to improve.
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