直流微网下的光伏可调度下垂控制方法  

A Dispatchable Droop Control Method for PV Systems in DC Microgrids

作　　者：倪佳华 项基[1] 李艳君[2] 赵波 NI Jiahua;XIANG Ji;LI Yanjun;ZHAO Bo(College of Electrical Engineering,Zhejiang University,Hangzhou 310014,Zhejiang Province,China;Hangzhou City University,Hangzhou 310014,Zhejiang Province,China;State Grid Zhejiang Electric Power Research Institute,Hangzhou 310014,Zhejiang Province,China)

机构地区：[1]浙江大学电气工程学院,浙江省杭州市310014 [2]浙江大学城市学院,浙江省杭州市310014 [3]国网浙江省电力有限公司电力科学研究院,浙江省杭州市310014

出　　处：《电网技术》2023年第11期4619-4628,共10页Power System Technology

基　　金：国家自然科学基金项目(62173295)。

摘　　要：为了提升光伏调度的灵活性,并解决传统基于U-I下垂的光伏控制方法中的过载问题,提出了以U-dp/du下垂控制为第1层,以调度指令跟踪为第2层的分层可调度下垂控制方法。在不同的时间尺度上,实现了不同的控制目标。在短时间尺度上,U-dp/du下垂控制可以在光伏电源之间分担瞬态功率波动;在长时间尺度上,跟踪调度指令以实现电压控制或功率调节。而且,以dp/du作为控制变量实现了光伏运行模式的无缝切换,不仅避免了过载问题,还能作为调度中的功率裕量指标。最后,在硬件在环实验中验证了所提算法的有效性。This paper proposes a dispatchable droop control to improve the flexibility of photovoltaic dispatching in order to solve the overload problem embedded in the traditional V-I droop control based methods.The proposed method utilizes a two-layer hierarchical control structure to realize different control objectives at different time scale.In the primary layer,the U-dp/du droop control is applied to achieve the passive power-sharing at a smaller time scale.The secondary layer realizes the power or voltage regulation based on the dispatch orders at a larger time scale.Moreover,with the dp/du as the control variable,the proposed method realizes the seamless mode switching and has the ability to roughly indicate the power margin of PVs,which is critical for dispatching PVs.Several case scenarios are conducted in hardware-in-loop tests to validate the feasibility and effectiveness of the proposed control strategy on the DC microgrids.

关 键 词：光伏系统 可调度 分层控制 下垂控制 直流微网 

分 类 号：TM721[电气工程—电力系统及自动化]