Comparison between alternative droop control strategy, modified droop method and control algorithm technique for parallel-connected converters

Muamer M. Shebani, M. Iqbal, J. Quaicoe
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引用次数: 1

Abstract

Most of the active current sharing methods are based on a communication network. The communication link is also used with the improved droop control methods to achieve a precise load current sharing and regulate the voltage at the common DC bus. Conversely, the conventional droop method that is considered a decentralized method becomes more attractive for controlling parallel-connected converters in DC microgrids. The conventional droop methods' main drawbacks are associated with the unequal load current sharing and voltage deviation at the common DC bus. In this paper, the modified droop method as a conventional droop method is augmented with a virtual droop and adaptive voltage control gains to improve the load current sharing and the voltage regulation, respectively. In contrast with other improved droop approaches, the control approach proposed in the paper does not require a communication link to exchange information between parallel modules. Instead, it uses the converters' theoretical load regulation characteristics to estimate the voltage set point for each converter locally. The proposed virtual resistive gain manipulates the modified droop method to regulate each module's droop gain, which ensures equal current sharing. The proposed method also eliminates the tradeoff between current sharing difference and voltage regulation by implementing the adaptive voltage control, which compares the estimated voltage at the point of common coupling with the rated bus value and adjusts the droop gains based on the compared values to ensure a constant voltage at various load conditions. The load current sharing and voltage restoration improvements of the proposed method versus the modified droop method and the control algorithm technique are observed in this paper. The proposed method's effectiveness is demonstrated by MATLAB/Simulink simulation and validated by an experimental prototype.
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并网变流器备选下垂控制策略、改进下垂控制方法和控制算法技术的比较
大多数有源电流共享方法都是基于通信网络的。通信链路还与改进的下垂控制方法一起使用,以实现精确的负载电流共享并调节公共DC总线处的电压。相反,传统的下垂方法被认为是一种分散的方法,对于控制直流微电网中的并联转换器来说更具吸引力。传统的下垂方法的主要缺点与公共直流母线上的负载均流和电压偏差不相等有关。在本文中,改进的下垂方法作为传统的下垂方法,分别增加了虚拟下垂和自适应电压控制增益,以改善负载均流和电压调节。与其他改进的下垂方法相比,本文提出的控制方法不需要通信链路来在并行模块之间交换信息。相反,它使用转换器的理论负载调节特性来局部估计每个转换器的电压设定点。所提出的虚拟电阻增益操纵修改的下垂方法来调节每个模块的下垂增益,从而确保相等的电流共享。所提出的方法还通过实现自适应电压控制来消除均流差和电压调节之间的折衷,自适应电压控制将公共耦合点处的估计电压与额定总线值进行比较,并基于比较值调整下垂增益,以确保在各种负载条件下的恒定电压。本文观察了该方法与改进的下垂法和控制算法技术相比,在负载均流和电压恢复方面的改进。通过MATLAB/Simulink仿真验证了该方法的有效性,并通过实验样机进行了验证。
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来源期刊
AIMS Electronics and Electrical Engineering
AIMS Electronics and Electrical Engineering Engineering-Control and Systems Engineering
CiteScore
2.40
自引率
0.00%
发文量
19
审稿时长
8 weeks
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