A Transformer-Less Unified Power Quality Conditioner with Fast Dynamic Control

Cheung, Victor Sui-pung; Yeung, Ryan Shun-Cheung; Chung, Henry Shu-Hung; Lo, W.L.; Wu, Weimin

doi:10.1109/tpel.2017.2715059

Cited by 57 publications

(19 citation statements)

References 23 publications

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“…With Equations (10) and (11), the transfer function that relates the voltage in the DC bus to the peak of the input current in the inverter is obtained, as shown in Equation (12). For the voltage mesh, this current is seen as a low-frequency component, for this reason, it is considered as a sinusoidal component, in the following way:…”

Section: Series Active Power Filter (Series Apf)mentioning

confidence: 99%

“…An UPQC consists of two power inverters operating as active filters that share the same direct current (DC) bus [6][7][8][9][10][11]; and they are widely used as energy controllers [12][13][14][15]. The active power filters (APFs) are connected to the power system generally by means of coupling inductors for the shunt active power filters (shunt APF), and coupling transformers for the series active power filters filters (APFs) are connected to the power system generally by means of coupling inductors for the shunt active power filters (shunt APF), and coupling transformers for the series active power filters (series APF).…”

Section: Introductionmentioning

confidence: 99%

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Classic Discrete Control Technique and 3D-SVPWM Applied to a Dual Unified Power Quality Conditioner

2019

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The unified power quality conditioners (UPQCs) are useful to correct distortions in voltage and current waveforms in case of problems related to harmonics, flicker, and power factor. The dual topology of the UPQC allows a loop control in the inverters less demanding in terms of switching functions; however, the control techniques proposed in the literature have some disadvantages as large computation time and some calculation delays. Therefore, this paper presents the application of a classic discrete-time control model for a three-dimensional space vector pulse width modulation (3D-SVPWM) to be used with the dual UPQC, obtaining a fixed commutation frequency and a low computation cost. The results show that the applied method helps to reduce the harmonics in the source, voltage sags and load current and improve the power factor of the electrical circuit tested. Furthermore, the high frequency created by the switching of elements in the UPQC is filtered by the impedance of the power source and it does not represent a problem for the circuit. Due to the simplicity of the model, simulations demonstrate that the application of this classical control technique is enough to achieve good results to compensate harmonics and power factor with the dual UPQC. The development of the controllers is carried out by discretization of the transfer functions of the control in continuous time and their application with the three-dimensional space vector pulse width modulation (3D-SVPWM) technique.

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Section: Series Active Power Filter (Series Apf)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Classic Discrete Control Technique and 3D-SVPWM Applied to a Dual Unified Power Quality Conditioner

2019

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“…Modeling, insertion of 'Open-UPQC' integrated PVG-system for improving efficiency of energy & PQof Radial-Distribution-Networks.Similar way UPQC-OWOB, energy extracted from PVA will directly given to the model. Recommended models incorporates in forward&backward-sweeps of load flows to evaluate operating-parameters like node-voltage [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Model Predictive Controller based Unified Power Quality Conditioner for Voltage Regulation Studies in 33- Bus Closed Loop Distribution System

Pasha

Kumar

2020

E3S Web Conf.

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Recent developments in FACTS have produced U.P.Q.C to mitigate sag and attenuate THD. U.P.Q.C has been urbanized as a FACTS controller between feeding end & far end of distribution system .The U-P-Q-C is capable of improving the voltage profile & reducing THD of distribution system by regulating the voltage using PR (Proportional-Resonant-Controller) and MPC (Model-Predictive) controller. This work proposes U-P-Q-C for Thirty Three Bus Systems .The objective of this work is to enhance-voltage-profile of T-T-B-S. The T-T-B-S in open loop & closed loop-TTBS- U-P-Q-C using PR and MPC-controllers are-modeled,pretend & their consequences are represented. Responses are estimated as a time of settle and error in steady state. The outcomes indicate that MP Controlled T-T-B-S system has better response than PR controlled T-T-B-S system.

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“…After a rigorous literature survey was conducted, it can be summarized that the research on UPQCs is mainly focused on its topology, compensation instruction detection, compensation control strategy, etc. [12][13][14][15][16][17][18][19][20][21][22][23][24][25]. In regard to topology, a novel ten-switch topology for unified power quality conditioner was proposed in Reference [12].…”

Section: Introductionmentioning

confidence: 99%

“…In regard to topology, a novel ten-switch topology for unified power quality conditioner was proposed in Reference [12]. A transformer-less unified power quality conditioner with fast dynamic control was proposed in Reference [14]. As for the power quality analysis, an output regulation-based unified power quality conditioner with Kalman filters was reported in Reference [15].…”

Section: Introductionmentioning

confidence: 99%

The Voltage Control Strategy of a DC-Link Bus Integrated Photovoltaic Charging Module in a Unified Power Quality Conditioner

Wang

2019

Energies

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In order to improve the functionality and efficiency of a unified power quality conditioner (UPQC), a DC-link bus integrated photovoltaic charging module is proposed in a UPQC. It can generate power for essential loads apart from providing energy to a DC-link bus. A conventional proportional integral (PI) controller fails to run smoothly in dynamic conditions of the micro-grid, since it has poor capabilities in determining suitable values of proportional gain and integral gain. So, the optimization algorithm for a PI controller based on chaos particle swarm optimization based on a multi-agent system (CPSO-MAS) algorithm was developed in this paper to overcome properties such as intermittent instability in the micro-grid. Through verification by simulation and experiment of UPQC harmonic compensation, it showed that the proposed DC link bus voltage control strategy can be effectively applied to UPQC towards various conditions related to voltage and current distortion. In addition, it proved that the proposed strategy has faster convergence than other algorithms, which enhances the stability of DC-link bus voltage. Hence, the contribution presented in this paper is to provide a novel approach for the power quality improvement of UPQC.

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A Transformer-Less Unified Power Quality Conditioner with Fast Dynamic Control

Cited by 57 publications

References 23 publications

Classic Discrete Control Technique and 3D-SVPWM Applied to a Dual Unified Power Quality Conditioner

Classic Discrete Control Technique and 3D-SVPWM Applied to a Dual Unified Power Quality Conditioner

Model Predictive Controller based Unified Power Quality Conditioner for Voltage Regulation Studies in 33- Bus Closed Loop Distribution System

The Voltage Control Strategy of a DC-Link Bus Integrated Photovoltaic Charging Module in a Unified Power Quality Conditioner

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