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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
Received:11 November 2023,
Revised:2024-05-10,
Published Online:19 July 2024,
Published:10 March 2025
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张育炜,肖迁,穆云飞等.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[J].电力系统自动化,2025,49(5):99-108.
ZHANG Yuwei,XIAO Qian,MU Yunfei,et al.Hierarchical Coordinated Control Strategy of Islanded Microgrid Cluster Considering Frequency and Voltage Limit Violation Risk[J].Automation of Electric Power Systems,2025,49(5):99-108.
张育炜,肖迁,穆云飞等.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[J].电力系统自动化,2025,49(5):99-108. DOI: 10.7500/AEPS20231111001.
ZHANG Yuwei,XIAO Qian,MU Yunfei,et al.Hierarchical Coordinated Control Strategy of Islanded Microgrid Cluster Considering Frequency and Voltage Limit Violation Risk[J].Automation of Electric Power Systems,2025,49(5):99-108. DOI: 10.7500/AEPS20231111001.
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.
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