Power Electronics for Renewable Energy Systems, Transportation and Industrial Applications

Chapter 23Modulation and Control of Single-Phase Grid-Side Converters

Sebastian Styński and Mariusz Malinowski

Faculty of Electrical Engineering, Warsaw University of Technology, Warsaw, Poland

23.1 Introduction

Recent advances in the field of energy conversion (e.g., distributed power generation systems, traction and adjustable speed drives (ASD)) show a focus on voltage source converters (VSCs) [1–5]. VSCs are designed to meet the demands of high efficiency, robustness and low harmonics injection into power systems or low torque pulsation (corresponding to an increased motor lifetime due to decreased shaft vibrations). Expectations related to energy-saving and power quality solutions cause more frequent replacement of input diode rectifiers with active front end (AFE) because of the following main features [6]:

• Bidirectional power flow (allows regenerative breaking),
• Nearly sinusoidal input current with low harmonics distortion,
• High (including unity)-input power factor operation,
• Sufficient dynamics to follow load variation,
• Adjustment and stabilization of the DC-link voltage (distorted 100 Hz oscillation),
• Operation under line voltage distortion (harmonics, sags, etc.).

Nowadays, AFE in AC–DC–AC energy conversion systems has started to be the standard solution. One of the important applications of medium-power AC–DC–AC fed ASD is high speed rail (HSR). Several different ...