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1.上海电力大学电气工程学院,上海市200090
2.国网浙江省电力有限公司温岭市供电公司,浙江省台州市 317500
Received:20 December 2023,
Revised:2024-01-23,
Published Online:14 June 2024,
Published:25 September 2024
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杨帆,曹九宙,叶灵玥等.基于增量成本的交直流混合微电网分级分布式控制策略[J].电力系统自动化,2024,48(18):199-207.
YANG Fan,CAO Jiuzhou,YE Lingyue,et al.Incremental Cost Based Hierarchical Distributed Control Strategy for AC/DC Hybrid Microgrid[J].Automation of Electric Power Systems,2024,48(18):199-207.
杨帆,曹九宙,叶灵玥等.基于增量成本的交直流混合微电网分级分布式控制策略[J].电力系统自动化,2024,48(18):199-207. DOI: 10.7500/AEPS20231220005.
YANG Fan,CAO Jiuzhou,YE Lingyue,et al.Incremental Cost Based Hierarchical Distributed Control Strategy for AC/DC Hybrid Microgrid[J].Automation of Electric Power Systems,2024,48(18):199-207. DOI: 10.7500/AEPS20231220005.
由于交直流混合微电网中分布式电源的成本各异,按照容量比例分配功率的下垂控制易造成系统成本较高,文中提出基于增量成本的下垂控制。为进一步解决线路阻抗不匹配对功率分配精度的影响,充分考虑微电网的经济运行,提出基于一致性算法的分级分布式控制策略。该控制策略分为子网级控制与系统级经济控制。子网级控制在基于增量成本的下垂控制中引入频率/电压二次控制项和成本二次控制项,恢复交流频率与直流电压,同时实现子网之间的分布式电源的经济功率分配。在系统级经济控制中引入“相对频率指数”与“相对电压指数”,构造双向互联变流器的本地控制策略,并进一步引入基于一致性算法的功率二次控制项,实现各分布式电源增量成本一致,从而达到系统全局最优的经济运行。最后,对交直流混合微电网模型进行仿真,验证了所提控制策略的有效性。
Due to the varying costs of distributed generators in the AC/DC hybrid microgrids
it tends to cause higher system costs with the droop control that distributes power according to the capacity ratio. A droop control based on incremental costs is proposed to address this issue. To further eliminate the impact of mismatched line impedances on the power distribution accuracy and fully consider the economic operation of the microgrid
this paper proposes a hierarchical distributed control strategy based on the consensus algorithm. This control strategy is divided into the subnetwork-level control and system-level economic control. The subnetwork-level control introduces the frequency/voltage secondary control term and cost secondary control term in the incremental cost based droop control to restore the AC frequency and DC voltage
and realizes the economic power distribution of distributed generators among the subnetworks at the same time. In the system-level economic control
the “relative frequency index” and “relative voltage index” are introduced to construct the local control strategy of the bi-directional interconnected converter. The power secondary control term based on the consensus algorithm is further introduced to realize the consistent incremental cost across distributed generators
so as to achieve the globally optimal economic operation of the system. Finally
the simulation of the AC/DC hybrid microgrid model is carried out to verify the effectiveness of the proposed control strategy.
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