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| Coordinated Control Strategy of Power Electronic Transformer and Energy Storage in Microgrid |
| Tu Chunming1, Huang Hong1, Lan Zheng2, Meng Yang1, Xiao Fan1 |
1. National Electric Power Conversion and Control Engineering Technology Research CenterHunan University Changsha 410082 China;
2. College of Electrical and Information Engineering Hunan University of TechnologyZhuzhou 412007 China |
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Abstract Microgrid can effectively improve the consumption of grid for the distributed energy resource, and the new development of microgrid is a configuration with power electronic transformer (PET) as its energy management core. Based on this new configuration of microgrid, the paper proposes a coordinated control strategy between of PET and energy storage. To guarantee the fixed voltage and frequency of microgrid, the interface converter of energy storage adopts the constant-voltage constant-frequency (CVCF) control. The low-voltage AC interface converter of PET adopts virtual synchronous generator control to adjust the mechanical reference power in real-time according to the state of charge of energy storage. The energy storage can quickly respond to power fluctuation. The PET can maintain the stability of energy storage capacity through bidirectional power regulation, and ensure the friendly exchange between the microgrid and grid. Moreover, because the PET and energy storage are controlled as voltage sources, the microgrid can still operate stably when one of them fails. The proposed control strategy can ensure the maximum efficiency of intermittent distributed energy resource, and enhance the stability, reliability and friendliness of the microgrid operation. The results of simulation and hardware in loop semi physical experiment verify the correctness and feasibility of the proposed control strategy.
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Received: 09 April 2018
Published: 28 June 2019
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2019, Vol. 34 
