Upqc is used to mitigate the power quality problems like harmonics and sag. Power quality enhancement by unified power quality. It uses a pair of threephase controllable bridges to produce current that is injected into a transmission line using a series transformer. 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 unified power quality conditioner is a power conditioning device, which is an integration of back to back connected. Power quality improvement by joined operation of an upqc. Sangameswararaju2 1,2eee,sv university tirupati, india in this paper, an artificial bees colony abc algorithm abstract. Harmonic mitigation using unified power quality conditioners and hybrid 123 fig.
The unified power quality conditioner is commonly called upqc. Unified power quality conditioner upqc using matlab. A unified power quality conditioner upqc 4 is the extension of the unified power flow controller upfc 5 concept at the distribution level. The main purpose of a upqc is to compensate for voltage imbalance, reactive power. Upqc provides the var requirement of the load, so that the supply voltage and current are always in phase. Pdf power quality improvement using interline unified power. Pdf power quality improvement by unified power quality. The power conditioning or the power quality of the microgrid is accomplished by unified power quality conditioner upqc. Open unified power quality conditioner model with and without. Enhancement of power quality by using unified power quality. Unified power quality conditioner upqc is one of the custom power devices, which can solve voltage and current related problem simultaneously. A power conditioner also known as a line conditioner or power line conditioner.
Industrial and sensitive loads can cause various types of power quality problems. It consists of combined series and shunt converters for. One of the inverters is controlled as a variable voltage source in series apf and the other as variable current source in shunt apf. Pdf this paper presents a control strategy for a unified power quality conditioner. Here we have done simulation of shunt active power filter, series active power filter and unified power quality conditioner. Unified power quality conditioner upqc controller and normal power converter to be used for dfig control system. 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. Power quality pq has become a relevant topic in the last decades, and pq parameters as the voltage rms value and total harmonic distortion thd are bounded by international standards, e. Pdf power quality enhancement using custom power devices pp 379406 cite as. The loadreactive power compensation in most of the upqc based power quality compensation.
Design of unified power quality conditioner upqc to. This paper presents an open unified power quality conditioner upqc model to improve the power loss and power quality for radial distribution systems. The shunt and series active filter performs the simultaneous elimination of current and voltage problems. The connection to the grid is made by a series transformer.
Abc reference frame, classical control theory is used in this control method. Pdf a control strategy for unified power quality conditioner. Unified power quality conditioner based on an indirect. Low voltage ride through capability enhancement in wind. Unified power quality conditioner based on current source converter. The upqc is similar in construction to a unified power flow controller upfc 9. Fuzzy logic controlled unified power quality conditioner. Unified power quality conditioner upqc that allows the connection of a photovoltaic panel to the grid without increase the number of power electronic converters. Nonlinear devices, such as power electronics converters, inject harmonic currents in the ac system and increase overall reactive power. In this, the design configuration is right series and left shunt with the current source converter csc 3, 4. Mitigation of power quality problems with reduced switches using unified power quality conditioner g. The upfc is employed in power transmission system, where as the upqc is employed in a power distribution system. The proposed conditioner is capable of being connected in threephase threewire systems.
Power quality improvement using adaptive unified power. One of the many solutions is the use of a combined system of shunt and active series filters like unified power quality conditioner upqc this device combines a shunt active filter together with a series active filter in a backtoback configuration, to simultaneously compensate the supply voltage and the load current or to mitigate any type of voltage and current fluctuations and power factor correction in a power distribution network. This paper introduces a unified power quality conditioner upqc laboratorial prototype, with a digital control strategy based on the instantaneous power theory pqtheory simplifications. Jun 11, 2014 the unified power quality conditioner is commonly called upqc. The controller can control active and reactive power flows in a transmission line. This paper deals with unified power quality conditioner upqc, which aims at the integration of seriesactive and shuntactive power filters. Dvr is dynamic voltage restorer and is used for improving voltage profile of line. Subhransu sekhar dash professor srm university, chennai,india abstract in this paper unified power quality conditioner upqc is being. Power quality improvement of wind energy conversion system. It is important to emphasize that the existing upqc topologies does not have this capability. Unified power quality conditioner based on a threelevel npc. Doctoral thesis, nanyang technological university, singapore. Multi converter unified power quality conditioning mcupqc. The design configuration is based on the connection of series and shunt inverters.
Unified power quality conditioner for improving power quality using ten switch inverter 1 s. 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. Abc and nfc based unified power quality conditioner for compensating power quality problem mr. When both these active power filters are combined then the combination is known as unified power quality conditioner. In this main focus is on the control system of upqc that reduces the problem of voltage and current simultaneously. Active power filters are classified into two types that is shunt active power. Unified power quality conditioner upqc for nonlinear and a voltage sensitive load has following facilities. Combined series and shunt active filters are known as unified power quality conditioner. Unified power quality conditioner upqc is one of the. Optimal location of unified power quality conditioner in. Unified power quality conditioner free download as powerpoint presentation.
On the other hand, superconducting magnetic energy storage smes are one of the most promising superconducting devices, considering its possible applications in power systems. Apf controller generates the reference current signal measuring the load voltage, load current, injected current and capacitor voltage. The shunt side of upqc is used to eliminate the harmonic current brought by nonlinear load into the microgrid. Enhancement of power quality by using unified power quality conditioner with pid and fuzzy logic controller r v d rama rao assoc. An application of unified power quality conditioner for. Power quality improvement using adaptive unified power quality conditioner. Power quality improvement of wind energy conversion. The neutral of series transformer used in the fourth wire for the 3p4w system. Unified power quality conditioner is an advanced concept in the area of power quality control. A unified powerquality conditioner upqc 4 is the extension of the unified powerflow controller upfc 5 concept at the distribution level. Due to vast implementation of power electronics based equipment power quality has turned into essential and important factor.
Constant frequencyunified power quality conditioner. 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. The proposed upqc is capable of mitigating source current harmonics and compensate all voltage disturbances such as voltage sags, swells, unbalances and harmonics. Here we have done simulation of shunt active power. According to the power quality problems of microgrid, this paper presents a control program of the unified power quality conditioner upqc to improve the microgrid power quality. 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. 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. The performance of proposed control system was analyzed using simulations with matlabsimulink program, and experimental results with the hardware prototype. Unified power quality conditionerupqc there are to voltage source inverters in upqc, they are connected back to back with a common dc link. Power quality improvement using unified power quality conditioner. Multi converter unified power quality conditioning mcupqc matlabcentralfileexchange58143multiconverterunifiedpower. 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.
A unified power quality conditioner upqc is a device that is similar in construction to a unified power flow conditioner upfc. This paper contains a combination of a smes with a upqc for power quality improvement in an. Request pdf interline unified power quality conditioner this paper proposes a new connection for a unified power quality conditioner upqc to improve the power quality of two feeders in a. Guna sekar me power electronics and drives, department of eee, kongu engineering collegeperundurai assistant professor, department of eee, kongu engineering collegeperundurai abstract. Now a days power electronics based appliances are widely used in industries and in distribution system which creates more power quality problems. In this is paper a broad overview on the different possible intelligent controls is given which is used with upqc. Harmonic mitigation using unified power quality conditioners. Effective renewable source integration using unified power quality conditioner with power quality enhancement in. In recent years, the prolific use of power electronics devices to improve the overall energy efficiency for electrical systems has led to the deterioration of power quality pq due to harmonic. This paper deals with the performance of unified power quality conditioner upqc based on current source converter csc topology. The device is connected between two feeders coming from different substa tions.
This paper presents a novel and efficient control scheme for unified power quality conditioner upqc based on threelevel neutral point clamped npc inverter using fuzzy logic techniques. In the other hand, facts devices can control the transaction power between scig and grid to avoid disconnection of wind turbine from grid 45. Department of electrical engineering national institute of technology, rourkela certificate this is to certify that the project entitled power quality improvement using unified power quality conditioner. 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 is one of the custom. It eliminates the harmonics in the supply current, thus. Pdf power quality improvement using interline unified. Velumani 1 pg scholar, 2assistant professor, 3 pg scholar 1 department of electrical and electronics engineering, 1 sona college of technology, salem, tamilnadu, india. The paper illustrates the operation and control of an interline unified power quality conditioner iupqc. So to improve power quality of a system we use different devices such as active power filters. In upqc, shunt apf is overburdened when it alone supplies total load reactive power. Power quality improvement using unified power quality.
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. It aims at the integration of seriesactive and shuntactive power filters. This paper proposes an improved control method for unified power quality conditioner upqc with unbalanced load. In this project presents a design of a unified power quality conditioner upqc connected to three phase four wire system 3p4w. The power fed is linked through common dc link and maintains constant real power. Unified power quality conditioner based on a threelevel. This is connected before load to make load voltage distortion free and at the same time reactive current drawn from source should be compensated in. Unified power quality conditioner in grid connected. 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. Aug 04, 2015 unified power quality conditioner 2 1. Unified power quality conditioner for improving power quality. The simulation result is verified using matlabsimulink. A survey on unified power quality conditioner for power. In this thesis, the applications of artificial neural network ann techniques as controllers for the shunt active filter and unified power quality conditioner upqc are proposed.
It eliminates the harmonics in the supply current, thus improves utility current quality for nonlinear loads. Keywords dual unified power quality conditioner iupqc, active and reactive power control, power quality problems, coordinate transformation. The latest generation of furmans legendary 15 amp power conditioners offer the most advanced protection of your valuable equipment and significantly reduce. An unbalanced and nonlinear load l1 is supplied by feeder1 while a sensitive load l2 is supplied through feeder 2. A modified control method for a dual unified power quality. Interline unified power quality conditioner request pdf. Unified power quality conditioner based on an indirect matrix. This paper discusses the compensation principle and control strategy of the upqc in detail. The unified power quality conditioner upqc aims at integrating both shunt and series apfs through a common dc link capacitor. Pdf unified power quality conditioner upqc during voltage.
Introduction the power electronic devices due to their inherent nonlinearity draw harmonic and reactive power from the supply. The paper discusses the topology and control of a unified power quality conditioner upqc that can be used simultaneously in voltage or current control mode in a power distribution system. Fuzzy logic controlled unified power quality conditioner for. A load is considered to be nonlinear if its impedance changes with the applied voltage.
Effective renewable source integration using unified power quality. Design of interline unified power quality conditioner for. Design of unified power quality conditioner upqc to improve. Power quality improvement by joined operation of an upqc and. This control strategy is used in threephase threewire systems find, read. 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 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.
Enhancement of power quality by using unified power. Implementation of unified power quality conditioner upqc in wind energy conversion system wecs more performance improvement is observed than the normal power converter system. The proposed upqc is based on an imc, providing a dc link to connect the panel, through an inductive filter. The role of unified power quality conditioner for power quality improvement is carried out for distribution network having nonlinear load. In a powers system network there are many problems related to power quality. A unified power quality conditioner upqc is a device that is similar in.
An improved control method for unified power quality. The upqc, like a upfc, employs two voltage source inverters vsis that are connected to a common dc energy storage capacitor. The loadreactive power compensation in most of the upqc based power quality compensation application is done by shunt apf, whereas, the series apf. Unified power quality conditioner 2 linkedin slideshare. Unified power quality conditioner for improving power. A unified power flow controller upfc is an electrical device for providing fastacting reactive power compensation on highvoltage electricity transmission networks. Abc and nfc based unified power quality conditioner for. Power quality, unified power quality conditioner, indirect matrix converter, sliding mode control. Pac method aims at effective utilization of series and shunt apfs by sharing reactive power burden between the two. 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. The main purpose of a upqc is to compensate for voltage imbalance, reactive power, negativesequence current and harmonics. Power conditioning of distributed generation system using unified. And the conditioner series part is used to suppress distributed new energy generation intermittence. Power quality improvement by unified power quality.
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