微电网中电力电子变压器与储能的协调控制策略

doi:10.19595/j.cnki.1000-6753.tces.180529

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摘要微电网可以有效提升电网对分布式能源的消纳能力,以电力电子变压器（PET）为能量管理核心的新型结构是微电网新的发展方向。提出一种PET与储能协调运行的微电网控制策略,储能的接口变换器采用恒压恒频控制维持微电网电压和频率的稳定,PET连接微电网的低压交流接口融合虚拟同步发电机控制,根据储能荷电状态实时调节机械参考功率。储能迅速响应微电网内功率波动,PET则通过双向功率调节来维持储能容量稳定,同时保证微电网与电网功率的“柔性”交换。由于储能和PET同时被控制为电压源型接口,其中一个出现故障时微电网仍然可以平稳运行。微电网运行在此控制策略下,可以保证间歇性分布式能源的最大效率利用,同时提高微电网运行的稳定性、可靠性和并网友好性。仿真和硬件在环半实物实验结果验证了所提控制策略的正确性和有效性。

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关键词 ：微电网, 电力电子变压器, 储能, 虚拟同步电机

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.

Key words： Microgrid power electronic transformer energy storage virtual synchronous generator

收稿日期: 2018-04-09 出版日期: 2019-06-28

PACS:

TM464

基金资助:国家自然科学基金资助项目（51577055）

通讯作者: 兰征男,1985年生,博士,讲师,研究方向为微电网、电力电子变压器和新能源并网控制。E-mail: lanzheng20@foxmail.com

作者简介: 涂春鸣男,1976年生,教授,博士生导师,研究方向为电力电子技术及其在电力系统中的应用、电能质量与控制、能源互联网、微电网等。E-mail: chunming_tu@263.cnet

引用本文:

涂春鸣, 黄红, 兰征, 孟阳, 肖凡. 微电网中电力电子变压器与储能的协调控制策略[J]. 电工技术学报, 2019, 34(12): 2627-2636. Tu Chunming, Huang Hong, Lan Zheng, Meng Yang, Xiao Fan. Coordinated Control Strategy of Power Electronic Transformer and Energy Storage in Microgrid. Transactions of China Electrotechnical Society, 2019, 34(12): 2627-2636.

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