基于虚拟振荡器的微网逆变器并联系统分析  

Analysis of microgrid inverter paralleling system based on virtual oscillator

作　　者：屠勇[1] 苏建徽[1] 杜燕[1] 杨向真[1] 徐华电 

机构地区：[1]合肥工业大学教育部光伏系统工程研究中心,安徽合肥230009

出　　处：《电力自动化设备》2017年第9期24-30,共7页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(51307042;51407057);台达环境与教育基金会<电力电子科教发展计划>重大项目(DREM2015002)~~

摘　　要：对含虚拟振荡器(VOS)的微网中逆变器并联控制策略进行建模与稳定性分析。离网状态下,采用VOS控制的逆变器并联相当于VOS控制器本身的并联,且VOS采用数字控制器编程得到。系统环流抑制效果受VOS控制器中谐振参数与激励源(EXS)函数影响。建立VOS控制器二阶系统传递函数和并联同步等效模型,分析了其稳定性与稳定条件。负载阻抗的变化会影响并联逆变器输出稳定,设计EXS模块基于功率均分状态补偿负载电流扰动,提高了输出电压波形的质量。仿真结果验证了所提方法的可行性。The paralleling control of microgrid inverter with VOS（Virtual OScillator） is modeled and its stability is analyzed. The inverter paralleling under VOS control in islanded microgrid is equal to the paralleling of VOS controller itself and the VOS controller is a digital controller by programming. The effect of system circulating current suppression is influenced by the resonance parameters and EXS（EXcitation Source） function. The second-order system transfer function is given,the equivalent paralleling synchronization model of VOS controller is established,and its stability and conditions are analyzed. As the load impedance variation may affect the output stability of parallel inverter,the EXS model is designed based on the power sharing state to compensate the load current disturbance for improving the quality of output voltage. Simulative results verify the feasibility of the proposed control method.

关 键 词：逆变器 虚拟振荡器 微网 并联 建模 

分 类 号：TM464[电气工程—电器]