This paper presents a design methodology and its experimental validation for the input-admittance passivity compliance of LCL grid-connected converters. The designs of the LCL filter parameters and the discrete controller are addressed systematically, and suitable design guidelines are provided. The controller design is developed in the Z-domain, with capacitor-voltage-based active damping used as a degree of freedom to compensate for system delay effects. The role of resistive components in the circuit, which have inherent dissipative properties, is also discussed. As an outcome of the design, a passive input-admittance shaping is obtained. The theoretical development is further verified in a low-scale prototype supplied from a controllable grid simulator. For the sake of generality, different combinations of resonant to sampling frequency are tested. Experimental results fully prove the input-admittance passivity compliance.

中文翻译：

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具有 LCL 滤波器的并网转换器的输入导纳无源合规性

本文介绍了 LCL 并网变流器输入导纳无源合规性的设计方法及其实验验证。系统地讨论了 LCL 滤波器参数和分立控制器的设计，并提供了合适的设计指南。控制器设计是在 Z 域中开发的，基于电容器电压的主动阻尼用作补偿系统延迟效应的自由度。还讨论了电阻元件在电路中的作用，它们具有固有的耗散特性。作为设计的结果，获得了无源输入导纳整形。在由可控网格模拟器提供的小规模原型中进一步验证了理论发展。为了一般性，测试了谐振与采样频率的不同组合。实验结果充分证明了输入导纳无源服从。