多逆变器并网系统谐振特性模态分析与有源阻尼稳定域计算  

Resonant analysis and stable domain calculation in multi-inverter grid-connection system

作　　者：武健[1] 赵家琦 王超[1] 侯睿[1] 徐殿国[1] 

机构地区：[1]哈尔滨工业大学电气工程及自动化学院,黑龙江哈尔滨150001

出　　处：《电机与控制学报》2018年第2期98-107,共10页Electric Machines and Control

基　　金：国家自然科学基金(51407043)

摘　　要：连接于同一公共连接点的多个并网逆变器与电网之间的交互影响对系统的稳定运行和电能质量是一个潜在的威胁。对于LCL型并网逆变器,LCL滤波器相互关联使多个逆变器构成一个高阶网络,激发频率更为复杂的谐振。基于逆变器侧电流直接控制建立微电网导纳矩阵,采用模态方法分析系统谐振频率。对于适用于逆变器侧电流直接控制的有源阻尼方法,通过离散系统稳定域分析,确定采样频率和有源阻尼系数的稳定区域。实验结果证实,模态分析和阻尼系数稳定域计算在多逆变器并网系统是有效的。Interaction between multiple grid connected inverters has a negative impact on the stable operation and power quality of the power grid. Interrelated influences of each inverter LCL filter make multiple inverters constitute a high order power network and excite more complex resonances at various frequencies. A micro grid admittance matrix was first established in which inverter used hysteresis control. Multiple resonances can then be evaluated by modal analysis. For active damping method applying to the hysteresis control, sampling frequency and stable domain of virtual damping ratio were also presented by analyzing the system stability in discrete domain. Experimental results have confirmed that the modal analysis and stable domain calculation of the active damping are effective for resonance in multiple inverters grid connected system.

关 键 词：模态分析 稳定性 多并网逆变器 谐振 有源阻尼 LCL滤波器 

分 类 号：TN911.22[电子电信—通信与信息系统]