考虑频率与电压越限风险的孤岛微电网群分层协调控制策略  

Hierarchical Coordinated Control Strategy of Islanded Microgrid Cluster Considering Frequency and Voltage Limit Violation Risk

作　　者：张育炜 肖迁 穆云飞[1] 贾宏杰[1] 金昱 陆文标 ZHANG Yuwei;XIAO Qian;MU Yunfei;JIA Hongjie;JIN Yu;LU Wenbiao(Key Laboratory of Smart Grid of Ministry of Education(Tianjin University),Tianjin 300072,China;State Key Laboratory of Power System Operation and Control(Tsinghua University),Beijing 100084,China)

机构地区：[1]智能电网教育部重点实验室(天津大学),天津市300072 [2]新型电力系统运行与控制全国重点实验室(清华大学),北京市100084

出　　处：《电力系统自动化》2025年第5期99-108,共10页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(52107121);新型电力系统运行与控制全国重点实验室开放基金课题重点项目(SKLD23KZ 04);天津市企业科技特派员项目(23YDTPJC00090)。

摘　　要：孤岛交直流混合微电网群多采用子微网功率按比例分配方法,其在重负荷接入下面临频率与直流母线电压的越限风险。为解决上述问题,提出了一种分层协调控制策略。首先,构建一种分层控制架构;其次,在微电网群控制层,提出一种基于子微网极限功率点钳位的微电网群互联变换器功率分配方法,当重负荷接入时,有越限风险的子微网功率钳位于其阈值,保证频率与电压稳态不越限;再次,在子微网控制层,设计一种基于频率与电压微分前馈补偿的子微网瞬时功率控制方法,进一步保证频率与电压动态不越限。基于此,通过建立系统的小信号模型分析关键参数对稳定性的影响,并给出参数的设计过程。最后,多工况下的仿真算例验证了所提方法的有效性与优越性。The islanded AC/DC hybrid microgrid cluster often adopts the proportional allocation method for the sub-microgrid power,which poses a risk of frequency and DC bus voltage limit violations under heavy loads.To solve the problem,a hierarchical coordinated control strategy is proposed.Firstly,a hierarchical control structure is constructed.Secondly,a power allocation method for interlinking converters based on sub-microgrid limit power point clamping is proposed in the microgrid cluster control layer.When heavy loads are connected,this method limits the power of the sub-microgrid with the risk of limit violation to the threshold and ensures that the steady-state frequency and voltage are within limits.Thirdly,a sub-microgrid instantaneous power control method based on differential feedforward compensation of frequency and voltage is designed,which can further ensure that the dynamic frequency and voltage are within limits.Based on this,the small-signal model of the system is built to analyze the impact of critical parameters on the stability,and the design process of critical parameters is given.Finally,simulation results under multiple operation conditions verify the effectiveness and superiority of the proposed method.

关 键 词：交直流混合微电网 频率越限风险 电压越限风险 分层协调控制 功率分配 小信号模型 

分 类 号：TM73[电气工程—电力系统及自动化]