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access icon free Analysis and improvement of performance in LCL filter-based PWM rectifier/inverter application using hybrid damping approach

© The Institution of Engineering and Technology
Received 20/01/2012, Accepted 25/06/2012, Revised 01/05/2012, Published

A hybrid passive-active damping solution with improved system stability margin and enhanced dynamic performance is proposed for high power grid interactive converters. In grid connected active rectifier/inverter application, line side LCL filter improves the high frequency attenuation and makes the converter compatible with the stringent grid power quality regulations. Passive damping though offers a simple and reliable solution but it reduces overall converter efficiency. Active damping solutions do not increase the system losses but can guarantee the stable operation up to a certain speed of dynamic response which is limited by the maximum bandwidth of the current controller. This paper examines this limit and introduces a concept of hybrid passive-active damping solution with improved stability margin and high dynamic performance for line side LCL filter based active rectifier/inverter applications. A detailed design, analysis of the hybrid approach and trade-off between system losses and dynamic performance in grid connected applications are reported. Simulation and experimental results from a 10 kVA prototype demonstrate the effectiveness of the proposed solution. An analytical study on system stability and dynamic response with the variations of various controller and passive filter parameters is presented.

Inspec keywords: PWM invertors; electric current control; power harmonic filters; passive filters; voltage control; electromagnetic interference; PWM rectifiers; LC circuits; power conversion harmonics; damping

Other keywords: system stability; LCL filter; resonance oscillation; PWM inverter; passive filter parameter; hybrid damping approach; apparent power 10 kVA; grid power quality regulation; high frequency attenuation; hybrid passive-active damping solution; EMI filter; high power grid interactive converter; PWM rectifier

Subjects: Power convertors and power supplies to apparatus; Other power apparatus and electric machines; Control of electric power systems; Current control; Electromagnetic compatibility and interference; Power supply quality and harmonics; Voltage control

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