Unified Power Quality Conditioner to Resolve the Power Quality Problems (original) (raw)
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THREE PHASE FOUR WIRE UNIFIED POWER QUALITY CONDITIONER FOR POWER QUALITY IMPROVEMENT
This paper presents a novel structure for a three phase four-wire (3P4W) distribution system utilizing unified power quality conditioner (UPQC). The 3P4W system is realized from a three-phase three-wire system where the neutral of series transformer used in series part UPQC is considered as the fourth wire for the 3P4W system. A new control strategy to balance the unbalanced load currents is also presented in this paper. The neutral current that may flow toward transformer neutral point is compensated by using a four-leg voltage source inverter topology for shunt part. Thus, the series transformer neutral will be at virtual zero potential during all operating conditions. The simulation results based on MATLAB/Simulink are presented to show the effectiveness of the proposed UPQC-based 3P4W distribution system. Index Terms- Active power filter (APF), four-leg voltage-source inverter (VSI) structure, three-phase four-wire (3P4W) system, unified power quality conditioner (UPQC).
RESOLVEMENT OF POWER QUALITY PROBLEMS BY UNIFIED POWER QUALITY CONDITIONER (UPQC
In this project presents a Design of a Unified Power Quality conditioner (UPQC) connected to three phase four wire system (3P4W). The neutral of series transformer used in the fourth wire for the 3P4W system. The neutral current that may flow toward transformer neutral point is compensated by using a four-leg voltage source inverter topology for shunt part. The series transformer neutral will be at virtual zero potential during all operating conditions. 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. A new control strategy such as unit vector template is used to design the series APF to balance the unbalanced current present in the load currents by expanding the concept of single phase P-Q theory.
This paper presents a novel structure for a three-phase four-wire (3P4W) distribution system utilizing unified power quality conditioner (UPQC). The 3P4W system is realized from a three-phase three-wire system where the neutral of series transformer used in series part UPQC is considered as the fourth wire for the 3P4W system. A new control strategy to balance the unbalanced load currents is also presented in this paper. The neutral current that may flow toward transformer neutral point is compensated by using a four-leg voltage source inverter topology for shunt part. Thus, the series transformer neutral will be at virtual zero potential during all operating conditions. The simulation results based on MATLAB/Simulink are presented to show the effectiveness of the proposed UPQC-based 3P4W distribution system. Index Terms—Active power filter (APF), four-leg voltage-source inverter (VSI) structure, three-phase four-wire (3P4W) system, unified power quality conditioner (UPQC)
A Review on Unified Power Quality Conditioner for 3P4W System
2017
Power Quality is the hot issue in the power world. Due to continuous use of the non-linear loads the voltage and current waveform shows the distortions. This distorted waveform produces quality issues in the distribution system. Power quality (PQ) mainly deals with issues like maintain a fixed voltage at the point of common coupling (PCC) for various distributed voltage levels irrespectively of voltage fluctuation, blocking of voltage and current unbalance from various distribution levels. In this paper discuss the various type of harmonics generated due to presence of the non linear loads. Also discuss the literature behind the Unified Quality Conditioner (UPQC) for three phase four wire system (3P4W).
POWER QUALITY IMPROVEMENT USING MULTI CONVERTER UNIFIED POWER QUALITY CONDITIONER WITH PQ THEORY
TJPRC, 2013
This paper presents a novel structure for a three phase four-wire (3P4W) distribution system utilizing Multi converter unified power quality conditioner (MC-UPQC). The 3P4W system is realized from a three-phase three-wire system where the neutral of series transformer used in series part MC-UPQC is considered as the fourth wire for the 3P4W system. A new control strategy to balance the unbalanced load currents is also presented in this paper. The neutral current that may flow toward transformer neutral point is compensated by using a four-leg voltage source inverter topology for shunt part. Thus, the series transformer neutral will be at virtual zero potential during all operating conditions. The simulation results based on MATLAB/SIMULINK are presented to show the effectiveness of the proposed MC-UPQCbased 3P4W distribution system. The present work study the compensation principle and different control strategies used here are based on PI, FUZZY & Neuro-Fuzzy controller of the MC- UPQC in detail.
Electric power is the most essential raw material impacting the bottom line of quality production economically on a commercial scale. It can’t typically be stored like other commodities and is essentially required with continuous flow all the time. Electric power can be visualized as the epitome of ‘just in time’ philosophy used like the components delivered to a production line by a trusted and approved supplier with no facility for ‘pre-inspection’. Now a day due to increased use of power electronic device at the distribution level the efficiency and reliability of supply being supplied to consumers is deteriorating. The increased voltage sag, voltage swell, flicker and other power quality problem attract the attention of consumer toward quality of power being supplied to them. Increased PQ problems leads to increased power loss, malfunctioning of electrical equipment and large financial loss, therefore the issue need quick attention. In this paper an effort is made by author to resolve the voltage and current related issues with application of Unified Power Quality Conditioner in the preinstalled distribution networks where design change is not possible. The author used Direct Torque Controlled Induction Motor Drive as a nonlinear load and constant impedance RL load as linear one in a 3-phase, 4-wire distribution system and compared the results with and without use of UPQC
International Journal of Engineering, Science and Technology, 2011
This paper presents a control strategy for a three-phase four-wire Unified Power Quality (UPQC) for an improvement of different power quality (PQ) problems. The UPQC is realized by integration of series and shunt active power filters (APFs) sharing a common dc bus capacitor. The shunt APF is realized using a thee-phase, four leg voltage source inverter (VSI) and the series APF is realized using a three-phase, three legs VSI. A control technique based on unit vector template technique (UTT) is used to get the reference signals for series APF, while ICosΦ theory is used for the control of Shunt APF. The performance of the implemented control algorithm is evaluated in terms of power-factor correction; load balancing, neutral source current mitigation and mitigation of voltage and current harmonics, voltage sag and swell and voltage dips in a three-phase four-wire distribution system for different combination of linear and non-linear loads. In this control scheme, the current/voltage control is applied over the fundamental supply currents/voltages instead of fast changing APFs currents/voltages, thereby reducing the computational delay and the required sensors. MATLAB/Simulink based simulations results are obtained, which support the functionality of the UPQC.
Electrical Power Quality and Utilisation. Journal, 2013
Summary: In this paper, some new control algorithms are proposed for a three-phase four-wire Unified Power Quality Conditioner. These control algorithms are based on the combination of Unit Vector Template Generation (UVTG) with Power Balance Theory (PBT), single phase d-q theory, Synchronous Current Detection (CSD) technique, and I CosΦ theory. The performance of each control algorithm of UPQC is evaluated in terms of power factor correction, load balancing and source neutral current mitigation, and voltage and current harmonic mitigation. The performance of proposed control algorithms are compared with synchronous reference frame (SRF) based control algorithm. In each proposed control scheme of the three-phase four-wire UPQC, the current/voltage control is applied over the fundamental supply currents/ load voltages instead of fast changing APFs currents/ voltages, thereby reducing the effects of computational delay. Moreover, the load neutral or shunt APF neutral currents are not ...
Control Algorithm for Three-Phase, Four-Wire Unified Power Quality Conditioner
2021
A simplified control algorithm for a three-phase, four-wire unified power quality conditioner (UPQC) is presented to compensate for supply voltage distortions/unbalance, supply current harmonics, the supply neutral current, the reactive power and the load unbalance as well as to maintain zero voltage regulation (ZVR) at the point of common coupling (PCC). The UPQC is realized by the integration of series and shunt active filters (AFs) sharing a common dc bus capacitor. The shunt AF is realized using a three-phase, four leg voltage source inverter (VSI) and the series AF is realized using a three-phase, three leg VSI. A dynamic model of the UPQC is developed in the MATLAB/SIMULINK environment and the simulation results demonstrating the power quality improvement in the system are presented for different supply and load conditions.