Abstract：This paper introduced a method of system stability for LCL type D-STATCOM with active damping when the effect of digital controlling time-delays is considered. By analyzing the impact on active damping and its equivalent virtual impedance caused by time-delays, the inherent relationship between time-delays and system stability is illustrated. Specially, a critical value of active damping coefficient is proposed to separate LCL resonance frequency into two distinct resonance frequency regions. And then the necessary conditions for system stability are deduced by identifying the relationship between the active damping coefficient and the critical value in the separated high and low resonance frequency regions. Simulation and experimental results verified the presented method.
夏伟, 康劲松. 考虑数字控制延时影响的LCL型配电网静止同步补偿器稳定性分析[J]. 电工技术学报, 2017, 32(14): 205-216.
Xia Wei, Kang Jinsong. Digital Control Time-Delays Affected Stability Analysis of LCL Type Distribution Static Compensator. Transactions of China Electrotechnical Society, 2017, 32(14): 205-216.
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2017, Vol. 32 
