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- 저자 : Faiz Muhammad Talib (검색결과 1 건)
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Improved Stability and Damping Characteristics of LCL-Filter Based Distributed Generation System
Faiz Muhammad Talib,Khan Danish,Khan Muhammad Mansoor,Ali Abdar,Tang Houjun 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.3
The voltage source inverter is a key component in the distributed power generation systems where the LCL -fi lter is a popular choice for interfacing with the grid. However, the well-known resonance issue associated with the LCL -fi lter deteriorates the control performance and risk the inverter system stability. The inverter control design plays a signifi cant role to ensure the quality of the injected grid current and stable operation according to the requirements of grid interconnection standards. This paper deals with an alternative control design method that modifi es the internal damping loop design to improve the stability and damping characteristics. The proposed design employs a compensator across the fi lter and feedbacks the output of the augmented plant at the reference voltage point, and named as parallel feedforward compensation method. The fi lter capacitor current measured for damping loop implementation, and a high-pass fi lter compensator adopted in the proposed confi guration. The proportional capacitor current feedback compensation method is considered for comparative studies. The current loop stability and control performance characteristics are investigated in detail under the resonance frequency and fi lter parameters variation condition. The signifi cant outcomes of the proposed scheme are faster dynamic response, higher delay compensation capability, relatively improved resonance suppression, and potential for better tracking performance. An experimental prototype is developed to validate the effi cacy of the proposed method.
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