Comparison of VSC and Z-Source Converter: Power System Application Approach

• Main Authors: Masoud Jokar Kouhanjani, Ali Reza Seifi
• Format: Article
• Language: English
• Published: VSB-Technical University of Ostrava 2017-01-01
• Series: Advances in Electrical and Electronic Engineering
• Subjects: small signal analysis; state space model; total harmonic distortion; voltage-source converter; z-source converter.
• Online Access: http://advances.utc.sk/index.php/AEEE/article/view/1766

Application of equipment with power electronic converter interface such as distributed generation, FACTS and HVDC, is growing up intensively. On the other hand, various types of topologies have been proposed and each of them has some advantages. Therefore, appropriateness of each converter regarding to the application is a main question for designers and engineers. In this paper, a part of this challenge is responded by comparing a typical Voltage-Source Converter (VSC) and Z-Source Converter (ZSC), through high power electronic-based equipment used in power systems. Dynamic response, stability margin, Total Harmonic Distortion (THD) of grid current and fault tolerant are considered as assessment criteria. In order to meet this evaluation, dynamic models of two converters are presented, a proper control system is designed, a small signal stability method is applied and responses of converters to small and large perturbations are obtained and analysed by PSCAD/EMTDC.