Adjusting the Low Order Harmonics in the Battery Currents for the Microgrid Power Converters with the Instant Islanding Capabilities

2018 IEEE 18th International Power Electronics and Motion Control Conference (PEMC) Pub Date : 2018-08-01 DOI:10.1109/EPEPEMC.2018.8521933

Jing Yang, Peng-cheng Li, Zhongxiao Cong, Yang Song, Shuai Lu

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引用次数: 1

Abstract

The instant islanding of a microgrid with the minimal voltage sag requires the instant outage detection, grid disconnection and switching of the inverters operating modes. This paper deals with the inverter (AC/DC) supplied by the DC/DC converter connecting the energy storage devices. The P/Q and V/F controls are used in the grid-tied and the islanding modes, respectively. The seamless islanding transition can be achieved if the DC/DC regulates the dc-link voltage for both modes. However, the stability requirements of the battery charging and discharging currents are not satisfied in this scenario. The paper introduces the low order harmonic (LOH) powers distribution mechanism in between different stages in the system, so that the LOH powers due to the non-sinusoidal grid voltages will not pass through to the battery side. The proposed adjusting mechanism are verified by the simulation. The experiment on a battery storage system (AC/DC and DC/DC) prototype is being carried out within a microgrid and the partial lab results are shown.

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具有瞬时孤岛能力的微电网变流器电池电流低次谐波的调节

具有最小电压凹陷的微电网的瞬间孤岛需要即时停机检测、电网断开和逆变器工作模式的切换。本文研究的逆变器(AC/DC)是由与储能装置连接的DC/DC变换器提供的。P/Q和V/F控制分别用于并网和孤岛模式。如果DC/DC调节两种模式的DC链路电压，则可以实现无缝孤岛转换。然而，在这种情况下，电池充放电电流的稳定性要求不被满足。本文介绍了低次谐波功率在系统各阶段之间的分配机制，使电网非正弦电压引起的低次谐波功率不会传递到蓄电池侧。仿真验证了所提出的调节机构的有效性。电池存储系统(AC/DC和DC/DC)原型实验正在微电网中进行，并给出了部分实验结果。

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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2018 IEEE 18th International Power Electronics and Motion Control Conference (PEMC)

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