多DG并网系统基波阻抗辨识研究

发布时间：2018-04-22 13:42

  本文选题：并网逆变器 + 电网等效阻抗　； 参考：《太阳能学报》2015年09期

【摘要】：提出一种并网逆变器基波线路阻抗的精确检测策略,该方法不但考虑到各分布式发电单元(distributedgeneration,DG)到公共耦合点(point of common coupling,PCC)的线路阻抗,还可分析PCC到主电网的线路阻抗和电网阻抗(电网等效阻抗)。该方法在虚拟单机等效模型的基础上,结合并网逆变器的下垂控制,通过给参考电压施加扰动,检测出系统中电压和电流变化量,通过分析线路阻抗和电网等效阻抗相关的电压回路方程获取阻抗参数。仿真和实验验证该策略的正确性和可行性。
[Abstract]:An accurate detection strategy for fundamental impedance of grid-connected inverters is proposed. This method not only takes into account the line impedance of distributed generation units (DGs) to the common coupling point of common coupling (PCCs). The line impedance and network impedance of PCC to the main power network can also be analyzed. Based on the virtual single-machine equivalent model and the droop control of grid-connected inverter, the voltage and current changes in the system are detected by disturbing the reference voltage. The impedance parameters are obtained by analyzing the voltage loop equation related to the line impedance and the grid equivalent impedance. Simulation and experiment verify the correctness and feasibility of the strategy.
【作者单位】： 燕山大学电力电子节能与传动控制河北省重点实验室;
【基金】：国家自然科学基金(51077112) 河北基金(E2012203163)
【分类号】：TM464
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本文编号：1787475