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arXiv 2104.02637eess.SYcs.SY
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基于无源性的模块化孤岛AC微电网统一控制框架

A Unified Passivity-Based Framework for Control of Modular Islanded AC Microgrids

Felix Strehle, Pulkit Nahata, Albertus Johannes Malan, Sören Hohmann, Giancarlo Ferrari-Trecate

摘要:

孤岛式交流微网的电压和频率控制是为了稳定由负载和拓扑结构变化引起的先验未知的微网平衡。本文提出了一个统一的控制框架,同时保证这种稳定性,允许模块化的ImGs互连多个子系统,即动态RLC线路,非线性恒阻抗,电流,功率(ZIP)和指数(EXP)负载,逆变器为基础的分布式发电机组(DGU)控制不同类型的主控制器。该框架的基本思想是基于一个平衡独立的被动性(EIP)的ImG子系统,这使得稳定性证书的ImG平衡,而无需他们明确的知识。为了使DGU EIP,我们提出了一种分散控制器综合算法的基础上端口哈密顿系统(PHSs)。我们还表明,EIP,是稳定的关键,提供了一个总体框架,可以包括其他解决方案,在文献中。此外,我们提供了一个新的参数的基础上,拉萨尔定理证明渐近电压和频率稳定。最后,我们利用PHS DGU模型固有的EIP特性,分析了执行器饱和对稳定性结果的影响。基于中压网络的CIGRE基准,理论研究结果得到了现实模拟的支持。

英文摘要:

Voltage and frequency control in an islanded AC microgrid (ImGs) amount to stabilizing an a priori unknown ImG equilibrium induced by loads and changes in topology. This paper puts forth a unified control framework which, while guaranteeing such stability, allows for modular ImGs interconnecting multiple subsystems, that is, dynamic RLC lines, nonlinear constant impedance, current, power (ZIP) and exponential (EXP) loads, and inverter-based distributed generation units (DGUs) controlled with different types of primary controllers. The underlying idea of the framework is based one equilibrium-independent passivity (EIP) of the ImG subsystems, which enables stability certificates of ImG equilibria without their explicit knowledge. In order to render DGUs EIP, we propose a decentralized controller synthesis algorithm based on port-Hamiltonian systems (PHSs). We also show that EIP, being the key to stability, provides a general framework which can embrace other solutions available in the literature. Furthermore, we provide a novel argument based on LaSalle's theorem for proving asymptotic voltage and frequency stability. Finally, we analyze the impact of actuator saturation on the stability results by exploiting the inherent EIP properties of the PHS DGU model. Theoretical findings are backed up by realistic simulations based on the CIGRE benchmark for medium voltage networks.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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