scispace - formally typeset
Search or ask a question
Proceedings ArticleDOI

Comparison of various Voltage Source Inverter based UPQC topologies

TL;DR: In this article, two new voltage source inverter (VSI) topologies for UPQC application are proposed, which enable UPQCs to have a reduced DC link voltage without compromising the compensation capability.
Abstract: The Unified Power Quality Conditioner (UPQC) is a custom power device, which mitigates voltage and current related power quality issues in the power distribution systems In this paper, two new Voltage Source Inverter (VSI) topologies for UPQC application are proposed The proposed topologies enables UPQC to have a reduced DC link voltage without compromising the compensation capability These proposed topologies also help to match the DC link voltage requirement of the shunt and series active filters in the UPQC In this paper the proposed UPQC topologies are compared with the existing topologies in the literature A simulation study of the proposed topologies has been carried out and the results are presented
Citations
More filters
Proceedings ArticleDOI
01 Dec 2017
TL;DR: A control strategy has be proposed that enables hybrid active filter to compensate harmonics with reduced DC bus voltages for any inductive/harmonic loading and a fixed margin controller has been proposed for a general loading condition.
Abstract: Power quality has become a major issue in electrical systems. Power quality improvement like harmonic compensation is mostly done using Hybrid Active Power Filter (HAPF). In conventional hybrid active power filter (series LC type) the reduction of DC voltage is based on the amount of inductive load present at the point of common coupling (PCC). If the load pattern varies the DC bus voltage requirement will be variable in conventional structures and compact inverter with reduced voltage rating can not be selected for the application. In this paper, a control strategy has been proposed that enables hybrid active filter to compensate harmonics with reduced DC bus voltages for any inductive/harmonic loading. DC Bus voltage reduction is achieved by an intentional reactive current injection from the inverter and such injection is required only when there is no or minimum inductive load at the PCC. Moreover, a fixed margin controller has been proposed for a general loading condition. The fixed margin controller keeps the maximum value of the modulation signal at a desired value. This allows the compensator to compensate higher magnitude of harmonics at reduced DC bus voltage. The proposed control scheme has been verified through detailed simulation studies and analysis.

3 citations


Cites background from "Comparison of various Voltage Sourc..."

  • ...In the literature, a number of studies focus in these aspects (DC link reduction) in harmonic and reactive load compensation application [8], [9], [10], [11]....

    [...]

Proceedings ArticleDOI
01 Aug 2019
TL;DR: A hybrid DSTATCOM can be used in highly PV penetrated distribution system to control the voltage and current related PQ issues and a dynamic reference load voltage generation algorithm using instantaneous symmetric component theory (ISCT) is presented.
Abstract: Large penetration of PV in a microgrid connected distribution system impacts the weak utility distribution system by creating various power quality (PQ) problems such as voltage sag or swell, unbalance, harmonics and DC current injection etc. These power quality (PQ) issues and they are broadly classified as current related PQ issues and voltage related PQ issues. The current related issues are mitigated by one of the custom power device connected in parallel namely distribution static compensator (DSTATCOM), by operating in current controlled mode (CCM). The dynamic voltage restorer (DVR) is another custom power device (CPD) for mitigating voltage related PQ problems. It is reported in literature that, a suitable modification of a DSTATCOM can achieve the capability to compensate voltage disturbances also. A multiple functions of DSTATCOM is thus achieved by operating the device so as to mitigate the current and voltage related PQ issues. Thus a multi-functional control strategy allow DSTATCOM to compensate voltage and current related PQ problems. This paper presents a hybrid DSTATCOM which can be used in highly PV penetrated distribution system to control the voltage and current related PQ issues. The topology uses a suitably designed foreign inductor, connected between the grid and load. A dynamic reference load voltage generation algorithm using instantaneous symmetric component theory (ISCT) is presented. The simulation is done with real time voltage level using MATLAB/SIMULINK.

2 citations


Cites background from "Comparison of various Voltage Sourc..."

  • ...Since, the DSTATCOM is to compensate both current and voltage disturbances in the VCM, it can be referred to as multiple function DSTATCOM [10], [11]....

    [...]

References
More filters
Book
01 Oct 1999
TL;DR: This is the first book to offer in-depth analysis of voltage sags and interruptions and to show how to apply mathematical techniques for practical solutions to these disturbances.
Abstract: "Power quality problems have increasingly become a substantial concern over the last decade, but surprisingly few analytical techniques have been developed to overcome these disturbances in system-equipment interactions. Now in this comprehensive book, power engineers and students can find the theoretical background necessary for understanding how to analyze, predict, and mitigate the two most severe power disturbances: voltage sags and interruptions.This is the first book to offer in-depth analysis of voltage sags and interruptions and to show how to apply mathematical techniques for practical solutions to these disturbances. From UNDERSTANDING AND SOLVING POWER QUALITY PROBLEMS you will gain important insights intoVarious types of power quality phenomena and power quality standardsCurrent methods for power system reliability evaluationOrigins of voltage sags and interruptionsEssential analysis of voltage sags for characterization and prediction of equipment behavior and stochastic predictionMitigation methods against voltage sags and interruptions"Sponsored by:IEEE Power Electronics Society, IEEE Industry Applications Society, IEEE Power Engineering Society.

2,052 citations


"Comparison of various Voltage Sourc..." refers background in this paper

  • ...INTRODUCTION With the proliferation of the power electronics devices, nonlinear loads and unbalanced loads, the power quality (PQ) in the power distribution network has degraded significantly [1]....

    [...]

BookDOI
01 Jan 1999

1,195 citations

Journal ArticleDOI
TL;DR: In this paper, a new approach for generating reference currents for an active filter and/or a static compensator is presented, where the compensators are connected to a load that may either be connected in star or in delta.
Abstract: This paper presents a new approach for generating reference currents for an active filter and/or a static compensator. It is assumed that the compensator is connected to a load that may either be connected in star or in delta. The load can be unbalanced and may also draw harmonic currents. The purpose of the compensating scheme is to balance the load, as well as make the supply side power factor a desired value. The authors use the theory of instantaneous symmetrical components to obtain an algorithm to compute three phase reference currents which, when injected to the power system, produce desired results. They also propose a suitable compensator structure that will track the reference currents in a hysteresis band control scheme. Finally, the feasibility of such a scheme is demonstrated through simulation studies.

322 citations


"Comparison of various Voltage Sourc..." refers methods in this paper

  • ...In this work, the reference currents for the active filters are generated using Instantaneous symmetrical component theory [25] To overcome the limitation of the algorithm, fundamental positive sequence voltages v la1(t), v + lb1(t) and v + lc1(t) of the PCC voltages are extracted and are used in the shunt algorithm [26]....

    [...]

Journal ArticleDOI
TL;DR: The simulation results based on Matlab/Simulink are discussed in detail to support the SRF-based control method presented in this paper and are validated through experimental study with the UPQC hardware prototype.
Abstract: This paper presents a new synchronous-reference-frame (SRF)-based control method to compensate power-quality (PQ) problems through a three-phase four-wire unified PQ conditioner (UPQC) under unbalanced and distorted load conditions. The proposed UPQC system can improve the power quality at the point of common coupling on power distribution systems under unbalanced and distorted load conditions. The simulation results based on Matlab/Simulink are discussed in detail to support the SRF-based control method presented in this paper. The proposed approach is also validated through experimental study with the UPQC hardware prototype.

270 citations


"Comparison of various Voltage Sourc..." refers background in this paper

  • ...Due to this criterion in literature, a higher DC link voltage based on the UPQC topology have been chosen [6], [19], [20]....

    [...]

Journal Article
TL;DR: In this article, a robust control scheme with an outer Hinfin voltage control loop and an inner current control loop is designed and implemented on a medium-voltage (MV)-level dynamic voltage restorer (DVR) system.
Abstract: In this paper, a robust control scheme with an outer Hinfin voltage control loop and an inner current control loop is designed and implemented on a medium-voltage (MV)-level dynamic voltage restorer (DVR) system. Through a simple selection of weighting functions, the synthesized Hinfin controller would exhibit significant gains in the vicinity of positive- and negative-sequence fundamental frequencies, and therefore, it would be able to regulate both positive- and negative-sequence components effectively, with explicit robustness in the face of system parameter variations. A detailed discussion of Hinfin controller weighting function selection, inner current loop tuning, and system disturbance rejection capability is presented. Finally, the designed control scheme is extensively tested on a laboratory 10-kV MV-level DVR system with varying voltage sag (balanced and unbalanced) and loading (linear/nonlinear load and induction motor load) conditions. It is shown that the proposed control scheme is effective in both balanced and unbalanced sag compensation and load disturbance rejection, as its robustness is explicitly specified.

188 citations