AC–DC–AC Converters for Distributed Power Generation Systems

The Chapter “AC‐DC‐AC converters for distributed power generation systems” is devoted to various topologies of AC‐DC‐AC converters and its components design. List of presented topologies are: classical three‐phase/three‐phase transistor‐based AC‐DC‐AC converters (2‐level and 3‐level Diode Clamped Converters (DCC) and Flying Capacitors Converters (FCC)), and simplified AC‐DC‐AC converters (2‐level and 3‐level three‐phase/one‐phase and three‐phase/three‐phase DCC). All presented topologies are compared briefly.The space vector modulation and control algorithms are selected and described. Solutions for DC‐link capacitors voltage balancing in DCC and flying capacitors voltage balancing in FCC are presented. Then, an approach related with controllers (machine side converter: flux, torque, and speed; grid‐side converter: current, power, DC‐link voltage) design are given. Finally, an improvement of power flow dynamics between machine‐side converter and grid‐side converter are proposed by active power feed‐forward (APFF) loop. The APFF allows for 10 times reduction of the DC‐link capacitance and provides better active power flow control accuracy in the AC‐DC‐AC converter. The laboratory results example is presented for control algorithm Direct Power and Torque Control with Space Vector Modulations of AC‐DC‐AC converter with APFF.