MATLAB Electrical IEEE +917207560923

Modelling and Analysis of STATCOM Based Voltage Regulator for Self-Excited Induction Generator with Unbalanced Loads

Abstract-

This paper presents an analysis of the three-phase self-excited induction generator (SEIG) with static-compensator {STATCOM) as a voltage regulator. Current controlled voltage source inverter (CC-VSI) is used as STATCOM, which provides fast dynamic response to maintain constant voltage at SEIG terminals during severe load perturbations and acts as a source and sink of reactive power. The performance equations are derived using d-q variable in stationary reference frame to develop a mathematical model of SEIG-STATCOM system feeding unbalanced loads. Transient analysis of the SEIGSTATCOM system is carried out for voltage build-up; switching in STATCOM, application and removal of balanced/unbalanced resistive/reactive loads. The STATCOM compensates the unbalanced load and keeps the generating system balanced while maintaining constant AC terminal voltage.

A Review of Control and Modulation Methods for Matrix Converters

Abstract—

This paper presents a review of the most popular control and modulation strategies studied for matrix converters (MCs) in the last decade. The purpose of most of these methods is to generate sinusoidal current on the input and output sides. These methods are compared considering theoretical complexity and performance. This paper concludes that the control strategy has a signiﬁcant impact on the resonance of the MC input ﬁlter.

A New Method for Islanding Detection of Inverter-Based Distributed Generation Using DC-Link Voltage Control

Abstract—

This paper presents a new method for islanding detection of inverter-based distributed generation (DG). The main idea of this paper is to change the dc-link voltage considering the PCC voltage changes during islanding condition. A simple islanding detection scheme has been designed based on this idea. The proposed method has been studied under multiple-DG operation modes and the UL 1741 islanding tests. The simulations results, carried out by MATLAB/Simulink, show that the proposed method has a small nondetection zone. Also, this method is capable of detecting is-landing accurately within the minimum standard time.

Two Types of KY Buck–Boost Converters

Abstract—

A novel voltage-bucking/boosting converter, named as KY buck–boost converter (i.e., 2D converter), is presented herein. Unlike the traditional buck–boost converter, this converter possesses fast transient responses, similar to the behavior of the buck converter with synchronous rectiﬁcation. In addition, it possesses the nonpulsating output current, thereby not only decreasing the current stress on the output capacitor but also reducing the output voltage ripple. Furthermore, it has the positive output voltage, different from the negative output voltage of the traditional buck–boost converter. Above all, there are two types of KY buck–boost converters presented herein. In this paper, the basic operating principles of the proposed converters are ﬁrst illustrated in detail, and second, some experimental results are offered to verify the effectiveness of the proposed topologies.

A Single Phase Matrix Converter for AGPU

Abstract -

This paper designs the single phase matrix converter to obtain a constant 110V/400Hz output, irrespective of the distortions in both the supply and load. The single phase matrix converter employs a safecommutation strategy, which results in the elimination of voltage spikes on switches, without the need of a snubber circuit. This is facilitated through proper switching control algorithm. Also, an improved control structure for the matrix converter system is devised in the simulation to control the output voltage. The operating principles of this converter are described and the circuit behaviour is conﬁrmed by the MATLAB / Simulink simulation results.

A Zero-Voltage-Switching DC–DC Converter With High Voltage Gain

Abstract—

A zero-voltage-switching (ZVS) dc–dc converter with high voltage gain is proposed. It consists of a ZVS boost converter stage and a ZVS half-bridge converter stage and two stages are merged into a single stage. The ZVS boost converter stage provides a continuous input current and ZVS operation of the power switches. The ZVS half-bridge converter stage provides a high voltage gain. The principle of operation and system analysis are presented. Theoretical analysis and performance of the proposed converter were verified on a 100 W experimental prototype operating at 108 kHz switching frequency.