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| Energy Self-Circulation Scheme and Power Coordinated Control of High-Frequency-Bus Based Electric Energy Router |
| Wen Wusong1, 2, Zhao Zhengming1, 2, Mo Xin1, 2, Li Kai3, Cai Weiqian1, 2, Feng Gaohui1, 2 |
1. Department of Electrical Engineering Tsinghua University Beijing 100084 China;
2. State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing 100084 China;
3. School of Electrical Engineering Beijing Jiaotong University Beijing 100044 China |
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Abstract A multi-port high-frequency-bus based electric energy router is presented in this paper. Compared with the conventional DC bus structure, this topology can reduce the number of cascaded power convertors and improve the system efficiency. Each port is isolated from each other, which can realize flexible grounding. It also has the features of modularity and scalability. In order to meet the requirements of full-power experiment and efficiency measurement in high-power applications, an energy self-circulation scheme is proposed, which can effectively reduce energy consumption and avoid the demand for high-power load. Moreover, to improve its dynamic performance, a power coordinated control strategy is developed. According to the distribution rule of three-phase average power, the injected positive- and negative-sequence currents are calculated to realize the control of high-voltage AC port under the conditions of unbalanced voltages and uneven active loads, the power cross-coupling suppression strategy is used for the system coordinated control. Finally, experiments performed on a 10kV/2MW prototype verify the effectiveness of the proposed scheme and control strategy.
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Received: 15 December 2019
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2020, Vol. 35 
