并联逆变器参数协同自适应VSG控制策略  

Parametric cooperative adaptive VSG control strategy for parallel inverters

作　　者：张玉璇 杜春水[1] 施其国 王爱平 炊德政 ZHANG Yuxuan;DU Chunshui;SHI Qiguo;WANG Aiping;CHUI Dezheng(School of Control Science and Engineering,Shandong University,Jinan 250061,China;Shandong Jiangxin Intelligent Technology Co.,Ltd.,Jinan 250199,China;Shandong Aotai Electric Co.,Ltd.,Jinan 250104,China)

机构地区：[1]山东大学控制科学与工程学院,山东济南250061 [2]山东江信智能技术有限公司,山东济南250199 [3]山东奥太电气有限公司,山东济南250104

出　　处：《电机与控制学报》2024年第9期47-59,共13页Electric Machines and Control

基　　金：国家自然科学基金(62173210);山东省重大科技创新工程(2019JZZY010423)。

摘　　要：虚拟同步发电机(VSG)控制的微电网逆变器并联时,因线路阻抗不匹配存在无法实现功率均分的现象,尤其在受到负载功率扰动时系统的频率稳定性变差。针对此问题,提出一种阻抗-惯量-阻尼3个参数协同自适应VSG控制策略。通过建立系统的小信号模型推导出系统闭环的根轨迹方程,进而分析惯量、阻尼等系统主要参数变化对系统稳定性的影响。利用线路首末端电压和输出功率信息准确反算线路阻抗,并通过自适应虚拟阻抗实时修正线路阻抗,使等效输出阻抗与功率容量成比例,实现功率分配。在此基础上,利用自适应惯量和阻尼系数保障系统的频率稳定性。通过上述3个参数协同的VSG控制提升并联系统的功率分配精度和频率响应特性。最后,通过仿真与实验结果验证所提控制方法的可行性和正确性。When virtual synchronous generator(VSG)-controlled microgrid inverters are connected in parallel,power equalization cannot be achieved due to line impedance mismatch,and the frequency sta-bility of the system deteriorates especially when subjected to load power perturbation.To address this problem,a cooperative adaptive VSG control strategy with three parameters of impedance-inertia-damping was proposed.By establishing a small-signal model of the system,the root trajectory equations of the closed-loop system were derived,and then the effects of the changes in the main parameters of the sys-tem,such as inertia and damping,on the stability of the system were analyzed.The impedance of the line was accurately calculated by utilizing voltage and output power information at both ends of the line,while real-time correction of line resistance was achieved through adaptive virtual impedance,so that the equivalent output impedance is proportional to the power capacity and the power distribution is realized;based on which the frequency stability of the system is guaranteed by using the adaptive inertia and damp-ing coefficients.The power allocation accuracy and frequency response characteristics of the parallel sys-tem are enhanced by the synergistic VSG control of the above three parameters.Finally,feasibility and correctness of the proposed control method are verified by simulation and experimental results.

关 键 词：微电网 逆变器并联 虚拟同步发电机 功率分配 虚拟阻抗 自适应控制 

分 类 号：TM341[电气工程—电机] TP273[自动化与计算机技术—检测技术与自动化装置]