Jacek Kaniewski

Modeling and Analysis of Three-Phase Hybrid Transformer Using Matrix Converter

This paper deals with modeling and analysis of a new solution for a three-phase AC transformer with electromagnetic and electric (hybrid) coupling. The electromagnetic coupling is realized by means of the conventional transformer. The electrical coupling is realized by means of a matrix converter (MC), which is supplied from an auxiliary secondary winding of the transformer. In this paper there are descriptions of the proposed solution, with a presentation of their modeling and analysis of their properties. The steady-state properties analysis is based on the D-Q transformation method and four terminal descriptions.

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.

Modelling and analysis of a three-phase quadrature phase shifter with a hybrid transformer

This paper deals with a quadrature phase shifter based on a hybrid transformer (HT) for power flow control and for transient stability improvement in AC transmission systems. This paper presents an operational description, a modelling and a theoretical analysis of the properties of the proposed solution. The steady-state analysis is based on the averaged state-space method and four terminal descriptions, and is verified both by means of the simulation and experimental investigations.

A voltage regulator/conditioner based on a hybrid transformer with matrix converter

This paper deals with a voltage regulator based on a hybrid transformer with matrix converter realizing an electrical coupling in the hybrid transformer unit. The parameters of electrical energy such as voltage amplitude are very important, particularly from the viewpoint of the final consumer and sensitive loads connected to the grid. Furthermore, a hybrid transformer using matrix converter can be used for power flow control and for transient stability improvement in AC transmission systems. Active power flow and voltage magnitude in transmission lines can be varied using a conventional or thyristor controlled regulators. However, the control parameters can be executed only in steps depending on the taps available in the transformer. An approach for obtaining continuous control of the voltage magnitude and phase shift using a conventional transformer with two windings and a pulse width modulated matrix converter is presented in this paper. The operating principles and steady state properties are discussed. Detailed computer simulation results are presented in the paper. Furthermore, experimental test results obtained from a three-phase 3 kVA laboratory model with passive load are also presented.

Modeling and analysis of three-phase hybrid transformer using buck-boost MRC

This paper deals with the modelling and analysis of the three-phase AC transformer with electromagnetic and electric (hybrid) coupling. The electromagnetic coupling is realized by means of the conventional transformer. The electrical coupling is realized by means of a buck-boost matrix-reactance chopper (MRC), which is supplied from an auxiliary secondary winding of the transformer. In this paper there are descriptions of the proposed solution, with a presentation of their modeling and analysis of their properties.

Hybrid Transformer With Matrix Converter

This paper deals with an ac-ac voltage regulator/compensator based on a hybrid transformer with a matrix converter realizing electrical coupling in the hybrid transformer unit. The parameters of electrical energy, such as voltage amplitude, are very important, particularly from the viewpoint of the final consumer and sensitive loads connected to the grid. Furthermore, a hybrid transformer using a matrix converter can be used for power-flow control and for transient stability improvement in ac transmission systems. Active power flow and voltage magnitude in transmission lines can vary by using a conventional mechanical or thyristor-controlled regulator. However, the control parameters can be executed only in steps depending on the taps available in the electromagnetic transformer. An approach for obtaining continuous control of the voltage magnitude and phase shift using a conventional transformer with two windings and a pulsewidth-modulated matrix converter is presented in this paper. The operating principles and steady-state properties are discussed. Detailed computer simulation results are presented in this paper. Furthermore, experimental test results obtained from a three-phase 3 kVA laboratory model are also presented.

Practical Application of Series Active Compensators

This chapter describes series-connected alternating voltage compensators in power systems. The focus of the description is on the structure, operation and control method of serial AC voltage compensators. The main part of this chapter concerns the practical application of the hybrid transformer (HT) (with electrical and electromagnetic coupling) as a special kind of serial AC serial voltage compensator. Presented are the calculations and experimental test results and future directions of the development of these devices.

Single-phase hybrid transformer using matrix-reactance chopper with Ćuk topology

This paper deals with the modelling and analysis of a new solution for a single-phase AC transformer with electromagnetic and electric coupling (hybrid coupling). The electromagnetic coupling is realized by means of the conventional transformer (TR) with two secondary windings. The electrical coupling is realized by means of a matrix-reactance chopper (MRC) whit Cuk topology, which is supplied from an auxiliary secondary winding of the transformer. This paper presents an operational description, a modelling and a theoretical analysis of the properties of the proposed solution. The steady-state analysis is based on the averaged state-space method and four terminal descriptions, and is verified both by means of the simulation and experimental investigations.

Three-phase voltage sag/swell compensator with phase shifter function based on bipolar matrix-reactance chopper

In this paper is proposed the new topology of AC/AC converter without DC energy storage to compensate deep voltage sags and swells and to control of output voltage phase shift. The proposed solution is intended to protect sensitive loads and energy flow control in AC power grid. The analyzed topology is based on AC/AC ĆukB2 bipolar matrix-reactance chopper. The paper presents an operational description, theoretical analysis and the experimental test results from a 1 kVA laboratory model. The main advantage of the proposed solution, is joining the properties of series AC voltage compensator and phase shifters without DC energy storages. The analyzed converter is ability to compensate single phase voltage interrupt, three-phase 50% voltage sags and swells and change the phase of output voltage in relation to input voltage.

Dynamic model of a space vector modulated buck-boost matrix-reactance frequency converter

The determination of the converter passive elements for various load and power grid conditions is of great importance to the proper operation of matrix-reactance frequency converters. The modulation strategy of power switches is very important to the voltage gain and input power factor control. The Space Vector Modulation is the most commonly used algorithm for the control of three-phase power converters. This paper presents a novel dynamic model of a Matrix-Reactance Frequency Converter that utilizes a Space Vector Modulation (SVM) switching method. In this paper the average-state space method and the two-frequency d-q transformation are proposed as aids in the process of fast verification of the matrix-reactance frequency converter operation under specific dynamic conditions.