Reactive electric spring (RES) is a technique aimed at stabilizing the user voltage in presence of grid voltage variations by means of a user-encapsulated circuit. In spite of the numerous papers on the matter, no expressions are still available to size the RES elements. This paper fills this lack, by drawing up a sizing procedure of them. The procedure starts with a targeted investigation of the RES operation and exploits the outcomes to provide expressions for the values of the passive elements as well as for the voltage-current ratings of the voltage source inverter (VSI). The sizing expressions are formulated in normalized form to emphasize their dependence on the parameters of the user non-critical load. Focus of the sizing procedure is on the two RES key-elements, namely the AC-side capacitor and VSI but the AC filter inductor and the DC-side capacitor are also sized. Two options for sizing the AC-side capacitor are also discussed. At last, the study case of a user supplied by a low-voltage distribution line is considered and the sizing expressions are utilized to calculate the RES data. Experimental results, obtained by an on-purpose arranged hardware-in-the-loop (HIL) rig, validate the sizing procedure.

中文翻译：

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电抗弹簧选型程序

电抗弹簧 (RES) 是一种旨在通过用户封装电路在存在电网电压变化的情况下稳定用户电压的技术。尽管有很多关于这个问题的论文，但仍然没有可用的表达式来确定 RES 元素的大小。本文通过制定它们的尺寸调整程序来填补这一不足。该过程首先对 RES 操作进行有针对性的调查，并利用结果来提供无源元件的值以及电压源逆变器 (VSI) 的电压-电流额定值的表达式。尺寸表达式以标准化形式表示，以强调它们对用户非关键负载参数的依赖性。规模调整过程的重点是两个 RES 关键要素，即交流侧电容器和VSI，但交流滤波电感器和直流侧电容器的大小也有所不同。还讨论了确定交流侧电容器大小的两种选择。最后，以某低压配电线路供电的用户为例，利用选型表达式计算RES数据。通过专门布置的硬件在环 (HIL) 装置获得的实验结果验证了尺寸调整程序。