Design and small signal analysis of DC microgrid with hybrid energy storage system

2017 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC) Pub Date : 2017-11-01 DOI:10.1109/APPEEC.2017.8308995

Srikanth Kotra, M. Mishra, Nakka Pruthvi Chaithanya

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引用次数: 9

Abstract

This paper presents the small signal analysis and two loop control design of a DC microgrid with control strategy based on the output of DC link voltage controller. The employed control strategy generates current references to PV, grid, battery and supercapacitor converters based on the average of DC link voltage controller output. In this control strategy, a single DC link voltage controller maintains the DC link voltage in all operating modes. Thus, designing a DC link voltage controller which is stable in all operating modes is a crucial aspect of DC microgrid. The design and stability analysis of DC microgrid employing this control strategy is not discussed in literature. In this work, a detailed two loop control design of a DC microgrid employing this control strategy is presented. The DC link voltage controller is designed such that it is stable in all operating modes and the effect of low pass filter introduced to obtain the average value of DC link voltage controller output is considered. Simulation study with the designed control parameters is performed to verify the stability of the system in various operating modes. Results show the satisfactory transient and steady state performance of the DC microgrid in all operating modes with the designed control parameters.

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混合储能系统直流微电网设计及小信号分析

本文采用基于直流链路电压控制器输出的控制策略，对直流微电网进行了小信号分析和双环控制设计。所采用的控制策略根据直流链路电压控制器输出的平均值生成光伏、电网、电池和超级电容器变流器的电流参考。在这种控制策略中，单个直流链路电压控制器在所有工作模式下保持直流链路电压。因此，设计一个在各种工作模式下都稳定的直流链路电压控制器是直流微电网的一个重要方面。采用这种控制策略的直流微电网的设计和稳定性分析尚未见文献讨论。在这项工作中，提出了采用这种控制策略的直流微电网的详细双回路控制设计。直流链路电压控制器的设计使其在所有工作模式下都保持稳定，并考虑了引入低通滤波器获取直流链路电压控制器输出平均值的影响。利用所设计的控制参数进行了仿真研究，验证了系统在各种工作模式下的稳定性。结果表明，采用所设计的控制参数，直流微电网在各种运行模式下均具有满意的暂态和稳态性能。

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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2017 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)

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