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| Coordinated Control of Multiple Voltage Balancers in a Bipolar DC Microgrid |
| Li Xialin1, Zhang Xuesong2, Guo Li1, Wang Chengshan1, Zhang Shaohui1, Yang Ping3 |
1. Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin 300072 China;
2. Electric Power Science Research Institute State Grid Zhejiang Electric Power Corporation Hangzhou 310014 China;
3. Guangdong Key Laboratory of Clean Energy Technology South China University of Technology Guangzhou 511458 China; |
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Abstract For neutral-point voltage balancing control in a bipolar DC microgrid, a coordinated control strategy for parallel operation of multiple voltage balancers was proposed, which was composed of droop method and disturbance observer based current feed-forward. With the observer and only the local measurements, the output current of the voltage balancer could be quickly tracked without any additional current sensors. Through the estimated value, DC voltage droop control and current feed-forward had been well designed. It can realize unbalanced current sharing and plug-play feature without communication, and improve the dynamics and stability of neutral-point voltage balancing control respectively. A prototype bipolar DC microgrid, including a DC simulated voltage source, two voltage balancers, resistive DC loads and a DC-DC converter based constant power load, has verified the performance of the presented control.
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Received: 01 September 2016
Published: 05 March 2018
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2018, Vol. 33 
