Secondary control for compensation of voltage harmonics and unbalance in microgrids

2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG) Pub Date : 2012-06-25 DOI:10.1109/PEDG.2012.6253978

M. Savaghebi, J. Vasquez, A. Jalilian, Josep M. Guerrero

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Abstract

In this paper, a hierarchical control scheme is proposed for enhancement of Sensitive Load Bus (SLB) voltage quality in microgrids. The control structure consists of primary and secondary levels. The primary control level comprises Distributed Generators (DGs) local controllers. Each of these controllers includes a selective virtual impedance loop which is considered to improve sharing of fundamental and harmonic components of load current among the DG units. The sharing improvement is provided at the expense of increasing voltage unbalance and harmonic distortion. Thus, the secondary control level is applied to manage the compensation of SLB voltage unbalance and harmonics by sending proper control signals to the primary level. DGs compensation efforts are controlled locally at the primary level. The system design procedure for selecting proper control parameters is discussed. Simulation results are provided in order to demonstrate the effectiveness of the proposed control scheme.

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微电网电压谐波和不平衡补偿的二次控制

提出了一种提高微电网敏感负载母线(SLB)电压质量的分级控制方案。控制结构由一级和二级组成。主控制层包括分布式发电机(dg)本地控制器。这些控制器中的每一个都包括一个选择性虚拟阻抗回路，该回路被认为可以改善DG单元之间负载电流的基波和谐波分量的共享。共享性能的提高是以增加电压不平衡和谐波畸变为代价的。因此，二级控制电平通过向初级电平发送适当的控制信号来管理SLB电压不平衡和谐波的补偿。发展主任的补偿工作在基层由当地控制。讨论了控制参数选择的系统设计过程。仿真结果验证了所提控制方案的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)

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