自适应虚拟阻抗的不平衡负载功率均分控制  

Unbalanced Load Power SharingControl Based on Adaptive Virtual Impedance

作　　者：卢星升 张继红[1] 谢波 于鸿雁 LU Xing-sheng;ZHANG Ji-hong;XIE Bo;YU Hong-yan(Inner Mongolia Key Laboratory of Solar Thermal and Wind Power,School of Information Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,China;不详)

机构地区：[1]内蒙古自治区光热与风能发电重点实验室,内蒙古科技大学,信息工程学院,内蒙古包头014010 [2]中海油新能源二连浩特风电有限公司,内蒙古古锡林郭勒026000

出　　处：《电力电子技术》2023年第6期61-65,108,共6页Power Electronics

基　　金：内蒙古自治区重点研发与成果转化项目(2022-YFHH0019);内蒙古自然科学基金(2021MS05039)。

摘　　要：多逆变器并联是解决系统扩容、电源互为备用、增强供电安全性的重要手段。此处针对各逆变器之间的空间跨度大、系统参数不一致以及功率分配不均等引起的母线电压波动、设备过载保护甚至损坏等突出问题,以两并联逆变器为例建立了改进传统下垂控制数学模型并推导了相应环流计算公式,分析了不平衡负载以及非线性负载接入对系统的影响,提出了一种正负序电压分量的自适应虚拟阻抗多环功率解耦控制算法。采用基于模型的解析方法探寻电压与功率两者关系机理;利用对称分量法将电压的正、负、零序分相进行控制,满足电压平衡需求;设计自适应虚拟阻抗控制策略,减小母线电压幅值和频率波动,提高功率分配精度,最后采用仿真和实验手段予以验证。Parallel connection of multiple inverters is an important measure which is to solve the expansion of system,mutual standby of power supplies,and enhancement of power supply reliability.In view of the prominent problems such as large space span between inverters,inconsistent system parameters,and uneven power distribution,these factors cause bus voltage fluctuation,equipment overload protection and even damage,two parallel inverters are taken as an example to establish an improved traditional droop control mathematical model and the corresponding circulating current calculation formula is deduced.The influence of unbalanced load and nonlinear load access on the system is analyzed,and an adaptive virtual impedance multi-loop power decoupling control algorithm for positive and negative sequence voltage components is proposed.Use model-based analytical methods to explore the relationship between voltage and power.Use the symmetrical component method to control the positive,negative and zero-sequence phases of the voltage to meet the voltage balance requirements.Design an adaptive virtual impedance control strategy to reduce the bus voltage amplitude value and frequency fluctuation range,improve the accuracy of power distribution,and use simulation and experimental means to verify.

关 键 词：并联逆变器 自适应虚拟阻抗 不平衡负载 功率均分 

分 类 号：TM464[电气工程—电器]