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中南大学学报(英文版)

Journal of Central South University

Vol. 21    No. 5    May 2014

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Norton equivalent circuit for current control loop of grid-connected system
TANG Ci(汤赐)1, 2, 3, YANG Geng(杨耕)2, TAN Jing-tao(谭惊涛)3

1. College of Electrical and Information Engineering, Changsha University of Science and Technology,
Changsha 410114, China;
2. Department of Automation, Tsinghua University, Beijing 100084, China;
3. Delta Power Electronics Center, Delta Electronics (Shanghai) Co., Ltd., Shanghai 201209, China;

Abstract:Modeling method for the current control loop of a grid-connected PWM inverter with the LCL output filter was discussed. Firstly, the current control loop with the LCL inverter-side current as feedback was established. Then, parameters of PI controller were calculated on the basis of an equivalent controlled object. Finally, Norton equivalent circuit for the current control loop of grid-connected system was derived by integrating one control equation, which connected the PWM inverter output voltage and the LCL inverter-side current, with two circuit equations, separately using the LCL inverter-side current and the injected current as loop currents. With the induced Norton equivalent circuit, system-level resonant and unstable issues on real grid-connected system applied in weak distributed power systems can be easily analyzed. The validity of substituting Norton equivalent circuit for grid-connected system is verified by simulation and experiment.

 

Key words: grid-connected system; PWM inverter; LCL output filter; weak distributed power system

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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