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Voltage control in a DC islanded microgrid based on nonlinear disturbance observer with CPLs
Journal of Energy Storage ( IF 9.4 ) Pub Date : 2020-03-21 , DOI: 10.1016/j.est.2020.101296
Habib Amiri , Gholamreza Arab Markadeh , Nima Mahdian Dehkordi

In this paper, a nonlinear voltage control for a DC islanded microgrid (MG) is proposed. This control method is a new nonlinear decentralized backstepping based strategy for voltage control of DC MG based on Sepic converter with nonlinear loads such as constant power loads (CPLs). The effect of CPL is to realize a load with negative resistance for DC MG that impacts the power quality of the power system and causes negative damping. The major purpose of the proposed controller is to improve the transient performance of MG with the Plug and Play (PnP) feature in the presence of load change and CPL. To consider the effects of such loads on the proposed control method, a nonlinear disturbance observer (NDO) along with backstepping controller is introduced to estimate the uncertain terms such as CPL and load currents as well as the current transferred between DGUs. The proposed method only measures the local voltage and current quantities without any need for additional information about the grid topology and its parameters. This method successfully regulates the point of common coupling (PCC) voltage. The stability of the method is proved via Lyapunov theory and its features are verified with simulation and some experiment tests.



中文翻译:

基于带有CPL的非线性干扰观测器的DC孤岛微电网中的电压控制

本文提出了一种直流孤岛微电网(MG)的非线性电压控制方法。这种控制方法是一种新的基于非线性分散反演的DC MG电压控制策略,该策略基于Sepic转换器,具有非线性负载,例如恒定功率负载(CPL)。CPL的作用是为DC MG实现具有负电阻的负载,这会影响电力系统的电能质量并引起负阻尼。所提出的控制器的主要目的是在存在负载变化和CPL的情况下利用即插即用(PnP)功能改善MG的瞬态性能。要考虑此类负载对建议的控制方法的影响,引入了非线性干扰观测器(NDO)和后推控制器来估计不确定项,例如CPL和负载电流以及DGU之间传递的电流。所提出的方法仅测量本地电压和电流量,而不需要有关电网拓扑及其参数的其他信息。此方法成功地调节了公共耦合(PCC)电压点。通过李雅普诺夫理论证明了该方法的稳定性,并通过仿真和实验验证了该方法的特点。

更新日期:2020-03-21
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