Harmonic and Negative-Sequence Current Control in an Islanded Multi-Bus MV Microgrid
Harmonic and Negative-Sequence Current Control in an Islanded Multi-Bus MV Microgrid
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DOI：
10.1109/tsg.2013.2263842
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发表时间：
2014
影响因子：
9.6
通讯作者：
M. Hamzeh;H. Karimi;H. Mokhtari
中科院分区：
文献类型：
--
作者：
M. Hamzeh;H. Karimi;H. Mokhtari
针对多节点中压微电网在非线性和不平衡负荷条件下的自主运行问题，提出了一种多功能控制策略。主要目的是利用电子耦合分布式发电（DG）单元有效地补偿非线性负载的谐波电流。该控制策略由谐振频率可调的多比例谐振控制器（MPRC）和谐波阻抗控制器（HIC）组成。MPRC和HIC分别被提出来调节微电网电压和在DG单元之间分担非线性负载的谐波电流。一个传统的下垂方案也被用来分享DG单元之间的负载的平均功率。此外，一个虚拟的负序阻抗控制回路增加到建议的控制系统，以补偿不平衡负载的负序电流。该策略通过对馈线的谐波和负序电流进行局部补偿，最大限度地减少了微电网中压线路中的谐波和负序电流。在PSCAD/EMTDC软件环境下进行数字时域仿真研究，验证了所提出的控制方案的性能。
This paper presents a multifunctional control strategy for the autonomous operation of a multi-bus medium voltage (MV) microgrid under nonlinear and unbalanced load conditions. The main objective is to effectively compensate the harmonic currents of nonlinear loads using electronically-coupled distributed generation (DG) units. The proposed control strategy consists of a multi proportional resonant controller (MPRC) with adjustable resonance frequency and a harmonic impedance controller (HIC). The MPRC and HIC are, respectively, proposed to regulate the microgrid voltage and to share the harmonic currents of the nonlinear loads among the DG units. A conventional droop scheme is also employed to share the average powers of the loads between the DG units. Moreover, a virtual negative-sequence impedance control loop is augmented to the proposed control system to compensate the negative-sequence currents of the unbalanced loads. The proposed strategy minimizes the flow of harmonic and negative-sequence currents in the MV lines of the microgrid by local compensation of harmonic and negative-sequence currents of the feeders. The performance of the proposed control scheme is verified by using digital time-domain simulation studies in the PSCAD/EMTDC software environment.