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考虑功率裕度和电压偏差的多端直流配电网自组织下垂控制
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现代电力系统仿真控制与绿色电能新技术教育部重点实验室(东北电力大学), 吉林省吉林市 132012

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国家重点研发计划资助项目(2018YFB0904700);国家自然科学基金资助项目(51677023)


Self-organizing Droop Control of Multi-terminal DC Distribution Network Considering Power Margin and Voltage Deviation
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Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology, Ministry of Education(Northeast Electric Power University), Jilin 132012, China

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    摘要:

    为实现系统受扰后不平衡功率的优化分配及直流电压的稳定控制,在多端柔性直流配电网传统电压—功率下垂控制的基础上,提出考虑功率裕度并附加定直流电压控制的自组织下垂特性优化方法。所提方法打破了采用传统下垂控制时换流站承担不平衡功率按其容量成比例分配的固有约束,实现不平衡功率的合理转移,降低了小容量换流站的过载风险;引入功率偏差因子,在下垂特性曲线中适当设定“死区”,一定程度上放宽换流站的运行区间。类比弹性力学概念,设计基于元胞自动机的换流站运行状态自组织更新规则,建立对应的五端柔性直流配电网MATLAB仿真模型,并与传统下垂控制的电磁暂态模型进行对比分析。最后,仿真结果验证了所提控制方法的有效性和控制效果。

    Abstract:

    In order to realize the optimal allocation of unbalanced power and the stable control of DC voltage after disturbance, this paper proposes a self-organizing droop characteristic optimization method considering power margin and additional constant DC voltage control based on the conventional voltage and power droop control of multi-terminal flexible DC distribution network. The proposed method breaks the inherent constraint that the unbalanced power of converter station is proportionally distributed according to its capacity in the conventional droop control, which realizes the rational transfer of unbalanced power and reduces the overload risk of smaller-capacity converter stations. By introducing the power deviation factor, the “dead zone” is appropriately set on the droop characteristic curve to relax the operation range of the converter station to a certain extent. By analogy to the concept of elasticity mechanics, this paper designs a self-organizing updating rule of operation state of the converter station based on the cellular automaton. The corresponding MATLAB simulation model of five-terminal DC distribution network is established, and the proposed model is compared with the electromagnetic transient model with traditional droop control. Finally, the simulation results verify the effectiveness and control effects of the proposed control method.

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成龙,金国彬,王利猛,等.考虑功率裕度和电压偏差的多端直流配电网自组织下垂控制[J].电力系统自动化,2019,43(23):81-89. DOI:10.7500/AEPS20190419005.
CHENG Long, JIN Guobin, WANG Limeng,et al.Self-organizing Droop Control of Multi-terminal DC Distribution Network Considering Power Margin and Voltage Deviation[J].Automation of Electric Power Systems,2019,43(23):81-89. DOI:10.7500/AEPS20190419005.

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  • 收稿日期:2019-04-19
  • 最后修改日期:2019-10-24
  • 录用日期:2019-09-20
  • 在线发布日期: 2019-10-23
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