Active filtering of electric power has now become a mature technology for harmonic and reactive power compensation in two-wire (single phase), three-wire (three phase without neutral), and four-wire (three phase with neutral) AC power networks with nonlinear loads. This paper presents a comprehensive review of active filter (AF) configurations, control strategies, selection of components, other related economic and technical considerations, and their selection for specific applications. It is aimed at providing a broad perspective on the status of AF technology to researchers and application engineers dealing with power quality issues. A list of more than 200 research publications on the subject is also appended for a quick reference.

A review of active filters for power quality improvement

http://ieeexplore.ieee.org/iel5/5610941/5624686/05624745.pdf

Power electronics

This paper presents an optimal power management mechanism for grid connected photovoltaic (PV) systems with storage. The objective is to help intensive penetration of PV production into the grid by proposing peak shaving service at the lowest cost. The structure of a power supervisor based on an optimal predictive power scheduling algorithm is proposed. Optimization is performed using Dynamic Programming and is compared with a simple ruled-based management. The particularity of this study remains first in the consideration of batteries ageing into the optimization process and second in the “day-ahead” approach of power management. Simulations and real conditions application are carried out over one exemplary day. In simulation, it points out that peak shaving is realized with the minimal cost, but especially that power fluctuations on the grid are reduced which matches with the initial objective of helping PV penetration into the grid. In real conditions, efficiency of the predictive schedule depends on accuracy of the forecasts, which leads to future works about optimal reactive power management.

Optimal Power Flow Management for Grid Connected PV Systems With Batteries

With the fast-paced changing technologies in the power industry, new power references addressing new technologies are coming to the market. So there is an urgent need to keep track of international experiences and activities taking place in the field of modern unit-commitment (UC) problem. This paper gives a bibliographical survey, mathematical formulations, and general backgrounds of research and developments in the field of UC problem for past 35 years based on more than 150 published articles. The collected literature has been divided into many sections, so that new researchers do not face any difficulty in carrying out research in the area of next-generation UC problem under both the regulated and deregulated power industry.

Unit commitment-a bibliographical survey

The hydrogen-fueled internal combustion engine : a technical review.

The installation of distributed generation (DG) on distribution feeders is known to have an impact on voltage regulation. A DG can provide voltage support in some cases, but can also cause an overvoltage or an undervoltage, depending on the several variables including relative DG size and location, distribution line and load characteristics, and method of voltage regulation. This paper shed some light the impact of DGs on voltage regulation and on overcurrent protection. These impacts are investigated on a feasibility study concerning the installation of a 5 MW grid-tied PV system to a local distribution system.

Voltage Regulation and Overcurrent Protection Issues in Distribution Feeders with Distributed Generation - A Case Study

50 utilities in the United States and Canada responded to a questionnaire survey regarding concerns about nonsinusoidal waveforms in the electric distribution network. Responses regarding instrumentation, apparent and reactive power definitions, meter errors, rates, and trends are presented and discussed.

A survey of North American electric utility concerns regarding nonsinusoidal waveforms

The impact of distributed generation (DG) on distribution system operation depends on numerous factors including DG size, type of equipment controls, feeder and load characteristics. This paper summarizes some simple and general rules for electrical distribution engineers, operations, and maintenance crew, when evaluating the interaction of a DG with distribution feeders. These rules include the DG impact on feeder power flow, power loss, voltage regulation, and fault currents.

General rules for distributed generation - feeder interaction

The author presents a direct method for determining steady-state voltage and current waveforms of an AC/DC converter circuit with overlap and DC ripple. The exact values of individual harmonic magnitudes are calculated easily from waveform discontinuity points by using algebraic additions instead of integrations. The total harmonic distortion of the line voltage at the coupling point is expressed in closed form. The expressions derived can be used with confidence to investigate accurate harmonic levels produced by converter-fed DC drives. >

An accurate solution to line harmonic distortion produced by AC/DC converters with overlap and DC ripple

A method of evaluating harmonic currents and voltages associated with slip power recovery drives is presented. The rectifier commutation overlap and DC link current ripple are included in the analysis by using a hybrid between the traditional d-q and a-b-c induction motor models. The harmonic components are determined from closed-form expressions which are functions of the numerical values of the distorted waveforms. Computer simulations illustrate the nonperiodic nature of the stator currents and typical harmonic contents of rotor phase current and voltage as well as inverter current at various speed values. >

Yahia Baghzouz

Papers

Voltage Regulation and Overcurrent Protection Issues in Distribution Feeders with Distributed Generation - A Case Study

A survey of North American electric utility concerns regarding nonsinusoidal waveforms

General rules for distributed generation - feeder interaction

An accurate solution to line harmonic distortion produced by AC/DC converters with overlap and DC ripple

Harmonic analysis of slip-power recovery drives