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| The Active Damping Method for Improving the Stability of DC Microgrid |
| Ji Yu1, Wang Dongxu2, Wu Hongbin2, Wu Ming1, Lü Qi3 |
1. China Electric Power Research Institute Beijing 100192 China;
2. School of Electrical Engineering and Automation Hefei University of Technology Hefei 230009 China;
3. Department of Electrical Engineering Tsinghua University Beijing 100084 China |
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Abstract In order to solve the unstable problem in DC microgrid caused by large amount of constant power load, this paper presents a new active damping control method based on the DC current feed forward of grid connected inverter. It also studies the mathematical model of grid connected DC-AC interfacing converter in the DC microgrid as well as the control strategy of active damping method for the DC-AC converter. Accordingly, the small signal mathematical model of the DC microgrid is established. Based on the dominant pole distribution and impedance matching principle, the adverse impacts of constant power load on the stability in DC microgrid and the improvement for the system stability by the active damping method are analyzed. The parameter design principles of the active damping are provided. The simulation and experimental results show that the proposed active damping control method can improve the stability of the DC microgrid with high penetration of constant power load.
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Received: 20 August 2016
Published: 31 January 2018
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| Fund:国家高技术研究发展计划（863 计划）（2015AA050104）, 国网公司科技项目“多分布式电源并网运行特性与仿真技术”。 |
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2018, Vol. 33 
