基于自适应虚拟谐波阻抗控制的孤岛微电网谐波均流策略Harmonic Current Sharing Strategy in Islanding Microgrid Based on Adaptive Virtual Harmonic Impedance Control
任碧莹;孙凯歌;马保慧;孙向东;
摘要(Abstract):
孤岛微电网中非线性负载带来了大量谐波,若各并联逆变器连接至公共交流母线的馈线阻抗与其额定容量失配,将使得谐波电流不能在各逆变器间均匀分配。固定虚拟谐波阻抗方法可以有效地提高谐波电流分配精度,但会影响公共交流母线电压质量。因此,提出了一种自动调节虚拟谐波阻抗实现谐波均流的控制策略。各逆变器根据其谐波电流的有效值构造实时变化的虚拟谐波阻抗,建立起谐波电流与虚拟谐波阻抗的自调整关系,重塑系统在谐波域的输出阻抗以匹配馈线阻抗,动态调整谐波电流分配,有效地提高了谐波均流精度,且兼顾了公共交流母线的电压质量,无需检测线路阻抗信息。仿真和实验结果验证了所提策略的可行性。
关键词(KeyWords): 非线性负载;固定虚拟谐波阻抗;自适应虚拟谐波阻抗;谐波电流
基金项目(Foundation): 国家自然科学基金(51477139);; 大型电气传动系统与装备技术国家重点实验室开放基金(SKLLDJ012016007);; 陕西省自然科学基金(2017JM5075)~~
作者(Author): 任碧莹;孙凯歌;马保慧;孙向东;
Email:
DOI: 10.13335/j.1000-3673.pst.2018.2788
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