Index terms unified power quality conditioner upqc, point of common coupling pcc, voltage source. A novel controlled technique for a dual unified power quality. 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. A novel hybrid unified power quality conditioner upqc for. Design of unified power quality conditioner upqc for power quality improvement in. R1 1 abstract this paper presents the study, analysis and practical implementation of a versatile unified power quality conditioner upqc, which can be connected in both threephase threewire or threephase fourwire distribution systems for. Introduction with the advent of power semiconductor switching devices, like thyristors, gtos gate turn off thyristors, igbts. Unified power quality conditioner for improving power quality.
Unified power quality conditioner upqc using matlab. Different devices are suitable for different power quality disturbances or deviations. One of the inverters is controlled as a variable voltage source in series apf and the other as variable current. A new unified power quality conditioner for grid integration. Power quality improvement submitted by rajiv kumar sinku roll no. Active power filters are classified into two types that is shunt active power. Power quality improvement using unified power quality conditioner. Enhancement of power quality by using unified power quality. The upqc is similar in construction to a unified power flow controller upfc 9. 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. Unified power quality conditioner for improving power quality using ten switch inverter 1 s. In respect to controlling structure, these converters may have various operations in compensation.
Power quality improvement by unified power quality. The upqc consists of two voltagesource converters vscs that are. The unified power quality conditioner upqc aims at integrating both shunt and series apfs through a common dc link capacitor. Design of interline unified power quality conditioner for.
The unified power quality conditioner is commonly called upqc. Optimal unified power quality conditioner placement and sizing in. Among them upqc is the most different and efficient device which was introduced in 1991. In this, the design configuration is right series and left shunt with the current source converter csc 3, 4. Quality conditioner for grid voltage regulation of. The connection to the grid is made by a series transformer. Due to increasing complexity in the power system, power quality problems are most significant problems. Jun 11, 2014 the unified power quality conditioner is commonly called upqc. Simulation of unified power quality conditioner should be done in matlab. This paper tries to investigate the unified power quality conditioner. Power quality enhancement by unified power quality. 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.
The unique topology can reduce the capacity of power devices in the hybrid upqc when compensating source harmonic currents. Photovoltaic based improved power quality using unified power. Pdf this paper deals with unified power quality conditioner upqc, which aims at the integration of seriesactive and shuntactive power filters. This paper proposed a threephase three wire upqc hybrid upqc. Unified power quality conditioner upqc is one of the custom. Fuzzy logic controlled unified power quality conditioner for. Different from a conventional upqc, in dupqc, the saf works as a current source and paf works as a voltage source both of them are synchronized with the grid voltage uses sinusoidal a novel controlled technique for a dual. Introduction the power electronic devices due to their inherent nonlinearity draw harmonic and reactive power from the supply. This paper proposes a new connection for a unified power quality conditioner upqc to improve the power quality of two feeders in a distribution system. Analysis of fuzzy logic based interline unified power quality.
Unified power quality conditioner upqc controller and normal power converter to be used for dfig control system. The upfc is employed in power transmission system, where as the upqc is employed in a power distribution system. Power quality improvement using unified power quality conditioner a thesis submitted in partial fulfillment of the requirements for the degree of master of technology in electrical engineering by shrutisnata mishra roll no. One of the vscs is connected in series with a distribution feeder, while the other one is connected in shunt with the same feeder. Power quality problems are harmonics, sag, and swell which are mitigated by the active filters by the configuration of dynamic voltage restorer dvr, distributionstatic synchronous compensator dstatcom, and unified power quality conditioner upqc 1. The proposed upqc is based on an imc, providing a dc link to connect the panel, through an inductive filter. An improved control method for unified power quality. Unified power quality conditioner based on an indirect matrix. A control strategy for unified power quality conditioner. 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. Unified power quality conditionerupqc there are to voltage source inverters in upqc, they are connected back to back with a common dc link. The recent research focuses on use of the unified power quality conditioner. This paper introduces a unified power quality conditioner upqc laboratorial prototype, with a digital control strategy based on the instantaneous power theory pqtheory simplifications.
Professor narasaraopeta engineering college, narasaraopet 522 601, india dr. Power quality improvement of wind energy conversion. A unified power quality conditioner upqc can perform the functions of both dstatcom and dvr. The newly proposed control technique involves a dual analysis of the upqc where the parallel compensator is modelled as a sinusoidal controlled. Dual unified power quality conditioner dupqc its structure is shown in fig. The seriesconnected converter such as dvr, injectextract the necessary voltage to compensate the supplyvoltage sagswell. Guna sekar me power electronics and drives, department of eee, kongu engineering collegeperundurai assistant professor, department of eee, kongu engineering collegeperundurai abstract.
This control strategy is used in threephase threewire systems. The loadreactive power compensation in most of the upqc based power quality compensation. We can use dc capacitor bank, fuel cell, pvarray, flywheel, supercapacitor, etc. Harmonic distortion and phase unbalance can combine to overstress motors. Unified power quality conditioner upqc during voltage. In this simulation we observe the power quality problems such as unbalanced voltage and current, harmonics by connecting non linear load to 3p4w system with unified power quality conditioner. Comprehensive control for unified power quality conditioners. Implementation of unified power quality conditioner upqc in wind energy conversion system wecs more performance improvement is observed than the normal power converter system. On the submission of my thesis entitled power quality improvement using unified power quality conditioner upqc, i would like to extend my gratitude and sincere thanks to my supervisor prof. Unified power quality conditioner for enhancement of.
Pdf power quality improvement by unified power quality. A novel hybrid unified power quality conditioner upqc. Custom power devices cpd such as dynamic voltage restorer dvr and unified power quality conditioner upqc provide a level of reliability and power quality that is urgently. May 09, 2015 unified power quality conditioner upqc the unified power quality conditioner upqc combines the shunt active power filter with the series active power filter, sharing the same dc link, in order to compensate both voltages and currents, so that the load voltages become sinusoidal and at nominal value, and the source currents become. Unified power quality conditioner upqc that allows the connection of a photovoltaic panel to the grid without increase the number of power electronic converters. A unified power quality conditioner upqc is a device that is similar in construction to a unified power flow conditioner upfc. The loadreactive power compensation in most of the upqc based power quality compensation application is done by shunt apf, whereas, the series apf. A unified power quality conditioner upqc is a device that is similar in construction to a unified power flow conditioner upfc 1. The controllers for the series and shunt components of the upqc are, equally, divided into three blocks. In this paper, an improved interline unified power quality conditioner iupqc using fuzzy logic controller flc, which compensates for various power quality disturbances, has been presented. Unified power quality conditioner upqc the unified power quality conditioner upqc combines the shunt active power filter with the series active power filter, sharing the same dc link, in order to compensate both voltages and currents, so that the load voltages become sinusoidal and at nominal value, and the source currents become. In this era of industrialization, the power quality is important for any. 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.
A unified powerquality conditioner upqc can perform the functions of both dstatcom and dvr. For improving power quality series and shunt compensation is provided in form of upqc, in which series apf. Power quality is one of the major problems in the todays scenario. One of the inverters is controlled as a variable voltage source in series apf and the other as variable current source in shunt apf. Versatile unified power quality conditioner applied to. When both these active power filters are combined then the combination is known as unified power quality conditioner. Optimal location of unified power quality conditioner in. This configuration includes current harmonics and reactive power compensations. The upqc device combines a shuntactive filter together with a seriesactive filter in a back. The unified power quality conditioner is a power conditioning device, which is a integration of back to back connected shunt active power filter apf and series apf to a common dc link voltage. To reduce the above draw backs a modified control method is used for unified power quality conditioner.
Unified power quality conditioner 2 linkedin slideshare. The conventional devices or equipment is not sufficient for enhancing the power quality. Pac method aims at effective utilization of series and shunt apfs by sharing reactive power burden between the two. Unified power quality conditioner upqc is one of the custom power devices which are used to solve voltage and current related problems simultaneously. Single phase unified power quality conditioner with minimum. In this main focus is on the control system of upqc that reduces the problem of voltage and current simultaneously. For improvement of power quality pq problems in a threephase fourwire distribution system, two topologies are proposed in this. Comparison of different controllers on unified power. The shuntconverter, such as statcom static synchronous compensator, connected in parallel with the load takes a. Various devices are available for power quality improvement. The proposed conditioner is capable of being connected in threephase threewire systems. Design of unified power quality conditioner upqc for.
Mitigation of power quality problems using unified power. It aims at the integration of seriesactive and shuntactive power filters. Power quality improvement of wind energy conversion system. Industrial and sensitive loads can cause various types of power quality problems. Such equipment, always known as active power filters apfs, and are also called active power line conditioners aplcs, instantaneous reactive. The main aim of series active filter is to synchronise the current with grid voltage. Unified power quality conditioner based on an indirect. These quantities are illustrated for an electrical system represented in abc coordinates. This paper proposes an improved control method for unified power quality conditioner upqc with unbalanced load.
Apf controller generates the reference current signal measuring the load voltage, load current, injected current and capacitor voltage. Unified power quality conditioner for improving power. Aug 04, 2015 unified power quality conditioner 2 1. In this paper, three controllers pi, ann and fuzzy logic controllers are proposed for the current control of shunt active power filter. Harmonic mitigation using unified power quality conditioners. Pdf unified power quality conditioner upqc during voltage. Single phase unified power quality conditioner with. The unified power quality conditioner upqc is a facts device that is used in the distribution system to. Unified power quality conditioner upqc is the most promising. Abstractin this paper, a unified power quality conditioner upqc is used for simultaneous compensation of current harmonics and voltage variations due to fault conditions in to grid. The upqc, like a upfc, employs two voltage source inverters vsis that are connected to a common dc energy storage capacitor.
Design of unified power quality conditioner upqc for power. Recent research has shown that unified power quality conditioner upqc can simultaneously fulfill different objectives, such as maintaining a sinusoidal voltage at the bus at which it is connected, maintaining voltage when there are voltage sags and swells in the system, eliminating harmonics in the source currents,, voltage sag. Now a days power electronics based appliances are widely used in industries and in distribution system which creates more power quality problems. Pdf power quality improvement using interline unified power. Interline unified power quality conditioner request pdf. Dvr is dynamic voltage restorer and is used for improving voltage profile of line. Due to vast implementation of power electronics based equipment power quality has turned into essential and important factor. A novel controlled technique for a dual unified power. The active series filter is normally used for voltagebased. Design of unified power quality conditioner upqc to. Unified power quality conditioner upqc there are to voltage source inverters in upqc, they are connected back to back with a common dc link. A modified control method for a dual unified power quality.
New applications approach to unified power quality. In this paper, combined operation of upqc with distributed generation dg is discussed. The distribution system, have numerous nonlinear loads, which severely affect the quality of power supplies. Power quality management using unified power quality. Mitigation of power quality problems with reduced switches. The topology is novel which consists of a series and a hybrid shunt filters. In this paper a detailed design about the main circuit is presented. This system integratedwith wind energy is able to compensate voltage sagswell, load. Fuzzy logic controlled unified power quality conditioner. The unified power quality conditioner is a power conditioning device, which is. The upqc consists of two voltagesource converters vscs that are connected to a common dc bus. Better power quality is required for various electronics and electrical devices to perform efficiently.
The power electronics based power conditiones ing devic can be an effective solutionto improve power quality in power system. In a powers system network there are many problems related to power quality. Enhancement of power quality by using unified power. Introduction p resently, power quality problems in gridintegrated applications take great interest because of the growing applications in power electronics. The power components power and quality are related to the same alpha and beta voltages and currents, and can be written together. Keywords power quality pq, unified power quality conditioner upqc, inverter, power flow controller pfc, series and shunt converter i. Introduction one of the comparative structures of the electric power is back to back converter. Power quality improvement using unified power quality. Design of unified power quality conditioner upqc to improve. Unified power quality conditioner, pv array, sag, swell, voltage interruption, harmonics and reactive power.
Department of electrical engineering national institute of technology, rourkela certificate this is to certify that the project entitled power quality improvement using unified power. The conventional upqc is same as dual unified power quality conditioner the only difference is way of controlled. Enhancement of power quality by using unified power quality conditioner with pid and fuzzy logic controller r v d rama rao assoc. Unified power quality conditioner in grid connected. A new approach with modeling the combination of unified power. This paper presents a comprehensive control strategy for unified power quality conditioners upqcs to compensate for both voltage and current quality problems. In upqc, shunt apf is overburdened when it alone supplies total load reactive power. Subhransu sekhar dash professor srm university, chennai,india abstract in this paper unified power quality conditioner upqc is being.
Velumani 1 pg scholar, 2assistant professor, 3 pg scholar 1 department of electrical and electronics engineering, 1 sona college of technology, salem, tamilnadu, india. Being an adaptable and flexible power electronic device, upqc has become the most appealing solution to power quality problems at the distribution level. The adherence to these standards can be achieved with a custom power device such as the unified power quality conditioner upqc. Photovoltaic based improved power quality using unified. So to improve power quality of a system we use different devices such as active power filters. An active shunt filter is a suit able device for current based compensation 5.
Protection against this situation is necessary because it adversely affects reliability and quality of power supply. Introduction electricity is the most famous form of energy which becomes compromised due to power quality problems. Singlephase unified power quality conditioner system. Mitigation of power quality problems with reduced switches using unified power quality conditioner g. Harmonic mitigation using unified power quality conditioners and hybrid 123 fig. The active shunt filter can also balance unbalancing currents. A survey on unified power quality conditioner for power.
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