摘要
当并联逆变器系统接入弱电网时,电网阻抗便不可忽略,多个并网逆变器之间的交互作用给逆变器的无功控制带来负面影响。以弱电网为研究背景,推导了多逆变器并联系统的传递函数模型。并在此基础上,从谐振特性,动态响应和静态误差这3个方面,分析了并联逆变器系统中逆变器无功控制之间的相互影响,最后利用matlab/simulink进行时域仿真,从并联台数和电网电压暂降2方面对上述分析的正确性进行了验证。
When clustered parallel inverters are connected to a weak point in the power system where there is high impedance between the converter and a stiff grid voltage, the grid impedance can not be neglected. As a result, interactive influence of multi-parallel inverters will cause reverse impacts on reactive power control of inverters. In the context of weak- structured power system, this paper deduces the control model of multi-parallel inverters. On the basis of this model, the interactive influences on reactive power control of inverters are also investigated in terms of the resonant characteristics, dynamic response and static error. Finally, simulation is carried out in Matlab/Simulink, the effectiveness of above analysis is validated on the aspects of both the number of inverters in parallel and voltage sag.
作者
夏曼
于航
李鹏
黄仁乐
常乾坤
XIA Man YU Hangl LI Peng HUANG Renle CHANG Qiankun(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources（North China Electric Power University）, Baoding 071003, Hebei, China State Grid Beijing Electric Power Research Institute, Beijing 100075, China)
出处
《电网与清洁能源》
北大核心
2017年第4期92-98,共7页
Power System and Clean Energy
基金
国家自然科学基金项目(51577068)
国家电网公司科技项目(520201150012)~~
关键词
并联逆变器集群
无功控制
交互影响
电网阻抗
弱电网
clustered PV inverters
reactive power control
interactive influence
grid impedance
weak power grid
