考虑光伏输出功率裕度的直流配电网自适应下垂控制  

Adaptive droop control of DC distribution network considering photovoltaic power margin

作　　者：刘青[1] 张彤钰 Liu Qing;Zhang Tongyu(School of Electrical and Electronic Engineering,North China University of Electric Power,Baoding 071003,China)

机构地区：[1]华北电力大学电气与电子工程学院,河北保定071003

出　　处：《可再生能源》2022年第9期1223-1231,共9页Renewable Energy Resources

基　　金：国家重点研发计划项目(2018YFB0904104)。

摘　　要：直流配电网中接入多个光伏电源时,功率裕度不同的光伏电源对系统不平衡功率的调节能力存在差异。为利用光伏电源的输出功率裕度调节直流母线电压,文章提出一种考虑光伏输出功率裕度的直流配电网自适应下垂控制策略。该策略利用光伏侧变流器输入端与输出端的电压信号对系统负荷变化以及光伏电源输出功率裕度的情况进行判断。对传统的下垂系数引入了基于光伏侧变流器输入端电压偏差的修正量,在输出功率裕度不同的光伏电源间,实现不平衡功率的合理分配。建立光伏侧变流器输出阻抗模型。理论分析表明,文章所提自适应下垂控制能有效提高多光伏并联接入直流配电网系统的稳定性。最后,基于Matlab/Simulink平台仿真验证了所提控制方法的有效性。When multiple photovoltaic power sources are connected to the DC distribution network,the regulation ability of photovoltaic power sources with different power margin for unbalanced power of the system is different.In order to make full use of the power margin of photovoltaic power sources to regulate DC bus voltage,this paper proposes an adaptive droop control for DC distribution network considering pho-tovoltaic power margin.By using the voltage signals of the input and output terminals of the PV converter,the system load change and the power margin of the PV are judged.On the basis of traditional droop control,the droop coefficient is modified based on the input voltage deviation of the PV converter,so as to realize the reasonable distribution of unbalanced power among photovoltaic power sources with different power margin.The output impedance characteristic model of PV converter is established,and the theoretical analysis shows that the adaptive droop control proposed in this paper can effectively improve the stability of the system when multiple PV parallel connected to DC distribution network.Finally,simulation experiments based on Matlab/Simulink platform verify the effectiveness of the proposed control method.

关 键 词：直流配电网 光伏 输出功率裕度 自适应下垂控制 输出阻抗 

分 类 号：TK51[动力工程及工程热物理—热能工程]