Grzegorz Benysek

Power electronics in smart electrical energy networks

Introduction Principles of Electrical Power Control Overview of Power Electronics Converters and Controls Quality Problems in Smart Networks EMC Cases in Distributed Electrical Power System High Frequency AC Power Distribution Platforms Integration of Distributed Generation with Electrical Power System Active Power Quality Controllers Energy Storage Systems Variable and Adjustable Speed Generation Systems Grid Integration of Wind Energy Systems Grid Integration of Photovoltaics and Fuel Cells

Single-phase PWM AC/AC semiconductor transformer topologies and applications

This paper deals with the AC voltage transformation circuits, which contain matrix or matrix-reactance PWM AC fine conditioners. These circuits can be treated as PWM AC/AC semiconductor transformers. In this paper the review of single-phase topologies are presented. The review covers both nonisolated and isolated ones as well as single or two-quadrant structure. Furthermore there are shown the averaged models, their four terminal chain parameters and some exemplary applications are outlined of presented AC voltage transformation circuits as well.

Power Theories for Improved Power Quality

The Earth has limited material and energy resources. Further development of the humanity will require going beyond our planet for mining and use of extraterrestrial mineral resources and search of power sources. The exploitation of the natural resources of the Moon is a first natural step on this direction. Lunar materials may contribute to the betterment of conditions of people on Earth but they also may be used to establish permanent settlements on the Moon. This will allow developing new technologies, systems and flight operation techniques to continue space exploration. In fact, a new branch of human civilization could be established permanently on Moon in the next century. But, meantime, an inventory and proper social assessment of Moon’s prospective energy and material resources is required. This book investigates the possibilities and limitations of various systems supplying manned bases on Moon with energy and other vital resources. The book collects together recent proposals and innovative options and solutions. It is a useful source of condensed information for specialists involved in current and impending Moon-related activities and a good starting point for young researchers.

AC/DC/DC Interfaces for V2G Applications—EMC Issues

Presented in this paper are the results of research connected with common mode (CM) interference generated by ac/dc/dc power electronic interfaces, which will very probably be commonly used in the future vehicle-to-grid systems. The results obtained show that the conducted CM interference generated by these converters in a low-voltage grid can be coupled to a medium-voltage (MV) network and observed at distant points under overhead MV lines. The developed passive CM voltage compensator dedicated for ac/dc/dc interfaces is recommended as an effective method for conducted interference reduction, preventing both aggregation and flow of interference in distant circuits.

Interline power flow controller-probabilistic approach

To improve energy quality in distribution systems, many different solutions there are implemented, for example: (i) active power filters (APF); (ii) unified power flow controllers (UPFC); (iii) unified power quality conditioners (UPQC); (iv) interline power flow controllers (IPFC). Interline power flow controllers are the classical series or series-parallel filters applied to given number of independent lines with common, for all lines, DC element. Their possible functions are enlarging and include power flow control between lines, reactive power compensation and distribution system stability improvement. In the paper, the authors show that using probabilistic approach to the distribution system one can considerably decrease power rating of the parallel active power filters when it is a component of the interline power flow controller.

Suppression of conducted EMI in four-quadrant AC drive system

This paper addresses problems connected with flow of conducted EMI on both sides of four-quadrant AC drive system. On the basis of measurements done in both time and frequency domains the passive methods of conducted EMI suppression have been proposed.

Control strategies and comparison of the Dynamic Voltage Restorer

This paper focuses on a selection problems of mitigation of the voltage disturbance by of the Dynamic Voltage Restorers (DVRpsilas). In short form presented and discussed are the basis of different control strategies of the DVR. The main emphasis is placed on application of modern power electronic devices. Authors of this paper in particular occupy oneself with analysis of the power rating of the typically DVR topologies. These problems are according to authors very important, because it makes possible to find optimum configuration of the DVR and energy capacity of the additional sources power.

Hybrid Voltage Sag\/Swell Compensators: A Review of Hybrid AC\/AC Converters

The parameters of electrical energy, such as supply voltage amplitude, are very important, especially from the viewpoint of the final consumer with respect to sensitive loads connected to the grid. Dynamic states in the power grid-voltage sags and swells-might cause faults and defects to develop in sensitive loads. To mitigate unwanted effects, many topologies of ac/ac converters are implemented as voltage compensators. This article presents a review of hybrid ac/ac converters designed to compensate voltage sags and swells with the aim of protecting sensitive loads against sudden and severe changes in supply voltage amplitude. In this article, only solutions without galvanic separation between source and load are described. To assess the properties and to compare different topologies of voltage compensators, some common parameters, such as range of voltage sag and swell compensation, reliability, quantity of switches and transformers, and required power ratings of power electronic units in relation to power of load, are introduced. In addition, we discuss possibilities for compensation of voltage interruption, time of compensation, the efficiency, and the effect on the supply network of the described circuits. The results of the analysis have been collected and compared in tabular form and represented in graphical form. Furthermore, we show potential areas of application for particular solutions of ac voltage compensators.

Compensation of CM voltage in interfaces for LV distributed generation

In this paper the results of research connected with common mode (CM) interference generated by four-quadrant frequency converters and effective methods of CM voltage compensation will be presented. The results obtained show that conducted CM interference generated by these converters in a low voltage (LV) grid can be transferred by means of parasitic couplings into a medium voltage (MV) network and can be observed at distant points under overhead MV lines.

Power quality conditioners with minimum number of current sensor requirement

The paper introduces power quality conditioners with minimum number of current sensors. The power balance method for active conditioners control is introduced as well. Some investigation results of implemented solution are depicted to prove effectiveness of proposed arrangements.