交直流混联独立微电网动态频率自律控制研究

交直流混联独立微电网可以提升分布式新能源消纳能力，提高供电可靠性，但电力电子化电源和负荷交互影响复杂，易造成电网功率失配和频率波动，混联独立微电网动态频率控制已成为国内外研究的热点和难点。为此，项目研究混联独立微电网动态频率自律控制，主要内容包括：1）探究交直流电网之间能量相互作用机理，建立基于动力学弹簧振子特性的功率调节模型，揭示多分布式电源同步稳定机制；2）利用广域测量信息挖掘统一参考频率和各子微网断面功率，创建互联微网频率稳定评估指标体系，提出融合一、二次调频的多微网无下垂功率支撑和分区自律控制方法，保障微网功率实时动态平衡；3）借助数据-模型双驱动场景生成和深度强化学习优化控制参数策略，提高频率控制鲁棒性。项目通过背靠背式电能路由器互联，实现频率自律控制，有望减小故障切负荷比例，提升高比例可再生能源独立微电网的动态频率稳定控制水平和生存能力，保障新能源消纳和供电可靠性。

The AC/DC hybrid independent microgrid is capable for improvement of the accommodation capacity of distributed new energy power, and increasing the reliability of power supply, however, it poses a significant complexity between power electronics and the load, which likely resulted in power mismatch and fluctuating frequency. So far the dynamic frequency control of hybrid independent microgrid has been one of the major challenges and frontiers in this field. To understand how to effectively control the frequency in hydrid independent microgrid, consisting several major steps: 1) Investigate energy interaction mechanism between DC and AC grids and establish power adjustment model upon characteristics of coupled phase oscillators for revealing synchrotroneous stabilization mechanism of differentiated energy resources. 2) Utilize wide-area measurement techniques to explore a unified reference frequency and transmission section active power flow of individual sub-microgrid, followed by building up a systematic evaluation criteria for interconnected microgrid frequency stability for proposing a primary and secondary frequency converged method which would enable real-time dynamic power balance under none-droop power support and partition self-regulation control. 3) By the aid of data-model dual driven scene generation, deep reinforcement learning and optimization of control strategies, we will be able to improve the robustness of frequency control. In this project, through back to back interconnecting power routers, a frequency self-regulation control was achieved which provide an implication to reduce load shedding ratio during fault, improve dynamic frequency stability and survivability of independent renewable energy microgrids as well as ensure the new energy consumption and power supply reliability.