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Journal ArticleDOI

Integrated power factor compensator based on sliding mode controller

01 May 2001-Vol. 148, Iss: 3, pp 237-244
TL;DR: In this paper, the switching mode rectifier is employed to work simultaneously as a power factor corrector and an active power filter, to decrease current harmonics drawn from a nonlinear load.
Abstract: Active power filters are an important means to increase power quality, due to wide use of nonlinear loads and switching mode power converters. The paper presents a simple control strategy which has employed the switching mode rectifier to work simultaneously as a power factor corrector and an active power filter, to decrease current harmonics drawn from a nonlinear load. As no additional active power filter is needed, the cost of this configuration is lower than that of the conventional active power filter configuration. A sliding mode controller is used in the current control loop to achieve fast dynamics. Only the source currents have been measured in the proposed control scheme to reduce the elements of current sensors needed in the conventional control approach. A simple proportional-integral controller is adopted in the voltage control loop to achieve slow dynamics. The proposed scheme can achieve high power factor, current harmonic elimination and no dedicated active power filter. A diode rectifier feeds the capacitive load as the nonlinear load is taken on AC mains to demonstrate the effectiveness of the proposed active rectifier for reactive power and current harmonic compensation.
Citations
More filters
Journal ArticleDOI
08 Jul 2003
TL;DR: In this paper, a modified hysteresis current controller for the control of a PWM rectifier is presented, where the controller parameters are designed in the discrete-time domain.
Abstract: A modified hysteresis current controller for the control of a PWM rectifier is presented. Mathematical modelling and control of the PWM rectifier is described. Controller parameters are designed in the discrete-time domain. A comparison study between a conventional hysteresis current controller and the modified hysteresis current controller is presented. Various simulation results are obtained and verified experimentally.

20 citations

Proceedings ArticleDOI
01 Dec 2006
TL;DR: Passivity-based sliding mode (PBSM) approach has been used on designing static synchronous compensator (STATCOM) controller aimed at reactive power compensation and voltage regulation.
Abstract: The Passivity-Based Sliding Mode (PBSM) approach has been used on designing Static Synchronous COM-pensator (STATCOM) controller aimed at reactive power compensation and voltage regulation. The energy-dissipative properties of the proposed model derived in the synchronous d-q rotating frame are fully retained. The proposed controller design is separated into the inner loop and the outer loop controller. In the inner loop, passivity-based control is employed by using energy shaping and damping injection techniques to produce the proper switching function for Voltage Source Converter (VSC)-based STATOCM. The load terminal voltage and the DC-side voltage dynamics are regulated via the outer loop controller cascaded to the inner loop controller. The outer loop control is employed by two sliding mode controllers to determine the appropriate current command. Simulation results are presented to show efficacy of the resulting PBSM controller with regard to voltage regulation and reactive power compensation.

15 citations


Cites background from "Integrated power factor compensator..."

  • ...Furthermore, the sliding mode control was also presented in [5]–[7] whose properties is that the discontinuous feedback control switches on one or more sliding manifolds in the state space....

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Proceedings ArticleDOI
01 Jan 2005
TL;DR: The simulations and experimental results are presented which show the performance of proposed estimator and predictor of grid emf and its influence on operation of the control system of PWM rectifier with active filtering.
Abstract: Control of PWM rectifier with active filtering is realized by fast and precise shaping of its AC currents. In the paper the control system with predictive algorithms of both set currents calculation and currents control is proposed. These algorithms provide very high accuracy and dynamics of AC currents shaping which is limited only by parameters of the power circuits. In both algorithms calculations are based on precise information about present and future samples of in general distorted and unbalanced equivalent electromotive force (emf) of the grid. For this purpose the novel, grid voltages sensorless, precise estimator and predictor of grid emf is proposed. This robust algorithm is based on digital signal processing techniques and requires relatively low computational effort. In this paper the simulations and experimental results are presented which show the performance of proposed estimator and predictor of grid emf and its influence on operation of the control system of PWM rectifier with active filtering

14 citations


Cites methods from "Integrated power factor compensator..."

  • ...la With proper control it is possible to combine parallel active filter [1] and PWM rectifier [2, 3] into one single device [4, 5, 6], as is depicted on Fig....

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Proceedings ArticleDOI
01 Jun 2005
TL;DR: The paper presents structure and experimental results of control system of the PWM rectifier with active filtering function and proposes a novel estimator and predictor for both control as well as calculation of grid currents.
Abstract: The paper presents structure and experimental results of control system of the PWM rectifier with active filtering function. Proposed control system was designed for maximum filtering performance in steady state. This task is realized by predictive algorithms applied for both control as well as calculation of grid currents. Accuracy of these algorithms strongly depends on precise information about future samples of equivalent electromotive force of the grid, which is in general distorted and unbalanced. For this purpose, a novel estimator and predictor is proposed. The control of DC voltage is realized with application of variable gain PI controller. It ensures high dynamics in transient states and low gain for steady state oscillations of DC voltage. Proposed control system is AC voltages sensorless and has excellent active filtering performance, even at presence of grid voltage distortions. power quality, PWM rectifier, active filter, predictive control

13 citations


Cites methods from "Integrated power factor compensator..."

  • ...Some examples of control algorithms of PWM rectifier with active filtering are presented in the literature [6], [7], [8]....

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Proceedings ArticleDOI
22 Apr 2007
TL;DR: In this paper, a multi-loop dynamic error driven controller based on the decoupled voltage and current tracking loops for modulating the static synchronous compensator (STATCOM) used in distribution networks with dispersed renewable wind energy generation is presented.
Abstract: This paper presents a novel multi-loop dynamic error driven controller based on the decoupled (d-q) voltage and current tracking loops for modulating the static synchronous compensator (STATCOM) used in distribution networks with dispersed renewable wind energy generation. The multi loop regulator adjusts the pulse switching pattern of the voltage-sourced converter (VSC) to ensure effective reactive power compensation and harmonic reduction. The effectiveness of the controller is fully validated under different operating conditions, like load switching and wind velocity excursions.

10 citations


Cites methods from "Integrated power factor compensator..."

  • ...Conventionally, passive LC compensator and power filters are used to reduce harmonics and improve the power factor, but they have the demerits of required large size, fixed compensation level and possible series and parallel resonances [5-6]....

    [...]

References
More filters
Journal ArticleDOI
TL;DR: In this paper, a new instantaneous reactive power compensator comprising switching devices is proposed, which requires practically no energy storage components, and is based on the instantaneous value concept for arbitrary voltage and current waveforms.
Abstract: The conventional reactive power in single-phase or three- phase circuits has been defined on the basis of the average value concept for sinusoidal voltage and current waveforms in steady states. The instantaneous reactive power in three-phase circuits is defined on the basis of the instantaneous value concept for arbitrary voltage and current waveforms, including transient states. A new instantaneous reactive power compensator comprising switching devices is proposed which requires practically no energy storage components.

3,331 citations

Journal ArticleDOI
TL;DR: In this article, an active power filter with quadruple voltage-source PWM converters was developed, of which the power circuit consists of quadruple-VRS converters.
Abstract: The control strategy of active power filters using switching devices is proposed on the basis of the instantaneous reactive power theory. This aims at excellent compensation characteristics in transient states as well as steady states. The active power filter is developed, of which the power circuit consists of quadruple voltage-source PWM converters. As the result, interesting compensation characteristics were verified experimentally which could not be obtained by the active power filter based on the conventional reactive power theory.

722 citations

Journal ArticleDOI
TL;DR: Active power line conditioning (APLC) as mentioned in this paper is a line conditioning technique that can potentially correct network distortion caused by power electronic loads by injecting equal-but-opposite distortion at carefully selected points in a network.
Abstract: Active power-line conditioning (APLC) is a concept that can potentially correct network distortion caused by power electronic loads by injecting equal-but-opposite distortion at carefully selected points in a network. Results are presented of an extensive literary survey on the subject of APLCs. Thirty-seven key publications are identified and reviewed. Existing and proposed line-conditioning methodologies are compared, and a list of the advantages and limitations of each is presented. >

573 citations

Journal ArticleDOI
TL;DR: In this article, the authors have characterized common nonlinear loads have been characterized into two types of harmonic sources, current-source type of harmonic source and voltage source type of source, and discussed the compensation characteristics of both parallel active filters and series active filters.
Abstract: In this article, common nonlinear loads have been characterized into two types of harmonic sources, current-source type of harmonic source and voltage-source type of harmonic source. Compensation characteristics of both parallel active filters and series active filters have been discussed analytically and experimentally for these two types of harmonic sources. The corresponding required operation conditions, features, application issues, and adaptive harmonic sources of both filters have been presented. The fact that the traditional active filter, the parallel active filter, is not a panacea to harmonic compensation, and that one cannot use it blindly, has been clearly addressed. The parallel active filter will increase harmonic current and may cause overcurrent of the load when the load is a harmonic voltage source. Instead, it has been verified that the series active filter is better suited for compensation of a harmonic voltage source such as a diode rectifier with smoothing DC capacitor. The conclusions of this article also imply that when a parallel active filter is installed in a power system network such as at a point of common coupling, the network impedance and main harmonic sources downstream from the installation point should be investigated in order to get good performance and to minimize influence to the loads downstream. In some cases, a combined system of parallel active filter and series active filter may be necessary by utilizing the harmonic isolation function of the series active filters. No doubt active filters are superior to passive filters if used in their niche applications.

524 citations

Proceedings ArticleDOI
08 Oct 1995
TL;DR: In this paper, a synchronous reference frame based controller for a hybrid series active filter system is proposed to provide harmonic damping and the use of simpler and low cost power factor correction capacitors as passive filters.
Abstract: This paper proposes a synchronous reference frame based controller for a hybrid series active filter system. A hybrid series active filter system has been designed, built and installed at Beverly Pump Station in New England Electric utility for 765 kVA adjustable speed drive load to meet IEEE 519 recommended harmonic standards. The series active filter is rated 35 kVA-4% of the load kVA, and is controlled by a synchronous reference frame based controller to act as a harmonic isolator between the supply and load. This paper discusses the basic synchronous reference frame controller structure and addresses its operation under nonunity controller loop gain conditions. Design trade-offs and implementation issues of the synchronous reference frame controller are discussed. Operation of the hybrid series active filter system under off-tuned passive filter conditions and its impact on the performance of the synchronous reference frame based controller is experimentally evaluated. Effectiveness of the series active filter to provide harmonic damping and the use of simpler and low cost power factor correction capacitors as passive filters, is demonstrated by laboratory experimental results. Field installation and laboratory experimental results demonstrate the practical viability of the synchronous reference frame based controller for hybrid series active filter to provide harmonic isolation of nonlinear loads and to comply with IEEE 519 recommended harmonic standards.

322 citations