The authors propose a control algorithm for a single-phase active-power filter working under a non-stiff voltage source. The method provides compensation for harmonics and reactive power and has an excellent dynamic performance. A detailed synchronization circuit is presented for proper sequencing of operation of the active power filter even when the source voltage contains multiple zero crossings. Experimental study has been carried out under a non-stiff voltage source to verify the proposed control scheme. © 2006 IEEE.

Mahesh Kumar Mishra

Department of Electrical Engineering

Algorithms

Electric current control

Electric distortion

Electric potential

Harmonic analysis

Synchronization

HARMONIC CURRENT DISTORTION

NON-STIFF VOLTAGE SOURCE

Zero crossings

ELECTRIC FILTERS

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

A control algorithm for single-phase active power filter under non-stiff voltage source

IEEE Transactions on Power Electronics

This study presents a novel constant switching frequency band controller for dynamic voltage restorer (DVR) with a proposed filter structure. The switching operation of voltage source inverter (VSI) based on band controller, which restricts the injected voltages within a band, is explored. This control method of the VSI inherits merits such as fast dynamic response, robustness, zero magnitude/phase errors and ease of implementation. The performance of the band controller is improved using a novel filter structure. Quantitative expressions involving the dynamics of DVR and variation of switching frequency are derived. The constancy in the switching frequency is subsequently achieved by an adaptive hysteresis band controller. The proposed filter structure and the adaptive band controller for the DVR are validated by carrying out simulation studies using PSCAD. The performance of the proposed controller in both transient and steady-state conditions has been evaluated and discussed. Based on the proposed design, the performance of the controller is extensively tested with various voltage disturbances on a reduced scale DVR prototype developed in the laboratory. © 2010 The Institution of Engineering and Technology.

IET Power Electronics

Constant switching frequency band controller for dynamic voltage restorer

In this paper, an optimization-based control algorithm for the compensation of steady-state load under distorted supply voltages is presented. For balanced and sinusoidal supply voltages, load compensation using shunt active filter produces perfect harmonic cancellation (PHC) and unity power factor (UPF) source currents. However, when the supply voltages are distorted, compensation for PHC will not provide UPF, as the harmonics in the supply voltages are not utilized for delivering the average power. In the same way, to achieve UPF source currents, the compensated source currents should have the same harmonics, unbalance, shape, and be in phase with the respective supply voltages, thereby violating the perfect harmonic cancellation objective. Hence, there should be an optimal operation between these two important compensation characteristics. The optimization-based control algorithm presented in this paper gives the best power factor while satisfying the constraints such as total harmonic distortion limits and average power balance of source currents. It is also flexible to adopt different compensation characteristics based upon the supply voltage conditions. MATLAB and its optimization toolbox are used for simulation studies and solving the nonlinear optimization problem, respectively. The algorithm is validated by using a prototype of digital signal processor (TMS320F2812PGFA)-based shunt active power filter. Detailed experimental results are presented. © 2009 IEEE.

Fulltext

An optimization-based algorithm for shunt active filter under distorted supply voltages

A comparative study of different algorithms for extracting reference compensating current for single-phase shunt active power filter is presented. The paper discusses different type of approaches, both direct and indirect methods, in detail. The performance of these algorithms is investigated giving an emphasis to the transient performance of the active power filter. © 2006 IEEE.

2006 IEEE Power India Conference

Comparison of single phase shunt active power filter algorithms

IEEE Transactions on Power Delivery

A Signal Processing System for Extraction of Harmonics and Reactive Current of Single-Phase Systems

A nonlinear adaptive filter for online signal analysis in power systems: applications

IEE Proceedings - Generation, Transmission and Distribution

A simple control scheme for hybrid active power filter

IEEE Transactions on Industrial Electronics

A simple frequency-independent method for calculating the reactive and harmonic current in a nonlinear load

IEE Proceedings - Electric Power Applications

Simplified control method for the single-phase active power filter

Journal	IEEE Transactions on Power Electronics
ISSN	08858993
Open Access	No