In the past years, strong changes of power network architectures and operation have led to make use of huge quantities of instrumentation, spread around the grid. In fact, there is a strong need to perform very accurate measurements of electrical quantities in many nodes of the network, mainly due to the strong penetration of distributed generation. Recently, the main Italian utility has also asked for such kind of instrumentation. Its main feature must be to perform accurate measurements in all actual conditions. Such conditions include the instrumentation operation during the off-nominal condition of the network. To this purpose, in this paper, a low-cost acquisition system (AS) developed by the authors is recalled. Then, a full comparison with off-the-shelf products during ideal or not power source is provided. The obtained results highlight the potentialities of the developed system for its implementation in both laboratory or medium-/low-voltage (MV/LV) networks.

中文翻译：

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非标称条件下低成本、基于 PLL 的采集系统的性能评估和比较

在过去的几年里，电网架构和运行的剧烈变化导致大量仪器的使用，分布在电网周围。事实上，非常需要对网络的许多节点中的电量进行非常准确的测量，这主要是由于分布式发电的强大渗透。最近，主要的意大利公用事业公司也要求提供此类仪器。其主要特点必须是在所有实际条件下进行准确测量。此类条件包括网络非标称条件期间的仪器操作。为此，本文回顾了作者开发的低成本采集系统（AS）。然后，提供了在理想或不理想电源下与现成产品的全面比较。