A Virtual Inertia Control Strategy with Current Feedforward to Improve Voltage Stability for Power Router

IECON 2021 – 47th Annual Conference of the IEEE Industrial Electronics Society Pub Date : 2021-10-13 DOI:10.1109/IECON48115.2021.9589922

Shaokun Niu, Tong Liu, Xi Liu, Qicai Ren, Zhiwei Chen, Alian Chen

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引用次数: 1

Abstract

The power router (PR) based on power electronic technology is the core equipment of the energy internet (EI). For the PR, the common direct current (DC) bus structure is drawing more and more attention, in which the DC voltage stability is of vital importance. In the PR with the energy storage system (ESS), the DC/DC converter of ESS has significant effects on the DC bus voltage stability. Droop control is commonly used in the control of DC/DC converters in ESS. However, conventional droop control fails to provide the inertia to meet the demand for voltage stability. Hence, a virtual inertia control strategy with load current feedforward is proposed in this paper to strengthen the voltage stability. Firstly, the small-signal model of ESS is derived to find out the key factors that affect the DC bus voltage stability. Secondly, based on the analysis, an inertial droop control strategy is presented to provide inertia to the DC bus voltage, while a load current feedforward method is proposed to improve the voltage response performance during load transients. The stability analysis is also carried out to guide the controller designing. The validity of the proposed control strategy has been verified by the results from both MATLAB/Simulink and hardware-in-the-loop (HIL) simulation.

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提高电源路由器电压稳定性的电流前馈虚拟惯性控制策略

基于电力电子技术的电力路由器是能源互联网的核心设备。普通直流母线结构越来越受到人们的重视，其中直流电压的稳定性至关重要。在带储能系统的PR中，储能系统的DC/DC变换器对直流母线电压稳定性有重要影响。下垂控制是ESS中常用的DC/DC变换器控制方法。然而，传统的下垂控制不能提供满足电压稳定性要求的惯性。为此，本文提出了一种负载电流前馈的虚拟惯性控制策略来增强电压稳定性。首先，建立了ESS的小信号模型，找出了影响直流母线电压稳定性的关键因素;其次，在分析的基础上，提出了一种惯性下垂控制策略，为直流母线电压提供惯性，同时提出了一种负载电流前馈控制方法，以改善负载瞬态电压响应性能。同时进行了稳定性分析，以指导控制器的设计。通过MATLAB/Simulink和硬件在环(HIL)仿真验证了所提控制策略的有效性。

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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IECON 2021 – 47th Annual Conference of the IEEE Industrial Electronics Society

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