基于并网逆变器的一种基波阻抗识别方法  

A FUNDAMENTAL IMPEDANCE IDENTIFICATION METHOD BASED ON GRID-CONNECTED INVERTER

作　　者：孙孝峰[1] 陈敬娴 骆志伟[2] 李向丽[1] 

机构地区：[1]燕山大学电力电子节能与传动控制河北省重点实验室,秦皇岛066004 [2]北京航天发射技术研究所,北京100076

出　　处：《太阳能学报》2014年第7期1237-1243,共7页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金重点项目(51077112);河北省自然科学基金(E2009000426)

摘　　要：提出低压微电网在并网模式下的一种基波阻抗检测方法,对其进行在线实时计算。该方法是在并网模式下,采用恒功率控制策略,通过分别变换有功功率和无功功率的形式,相应识别出线路基波电阻和基波感抗值。控制策略由仿真软件PSCAD和基于TMS320F2812的实验平台验证线路基波阻抗识别的准确性。The paper analyses the influence of the fundamental impedance from inverter to PCC with regard to the system＇s stability in the microgrid. The values of the line fundamental impedance can not only apply to the decoupled droop control which can realize the accurate control between active power and reactive power but also apply to regulate the droop coefficient in order to eliminate the system circulation, realize the power distribution justifiableness and improve the system stability when mutil-distributed generation parallel run. A novel fundamental impedance identification method is proposed which applies to the grid-connected mode and adopts online real-time calculation. In the grid-connected mode, through varying the active and reactive power method, respectively, the fundamental resistance and the fundamental inductive reactance can be identified which adopted, constant power control strategy. This strategy has been tested in the PSCAD simulation and experiments based on the TMS320F2812, the results are shown the accuracy of the control scheme.

关 键 词：微电网 并网逆变器 基波阻抗识别 恒功率控制 功率扰动 

分 类 号：TM46[电气工程—电器]