Abstract
This work presents a concise methodology for the calculation of assessment indexes regarding the coupling between active and reactive power control observed on distribution level converters. First, the reader is introduced to the concept of power coupling; when, where and how it appears in power control of converters. A brief summary of the theory and formulation behind it is also included, together with relevant literature. Then, the methodology for the assessment of active and reactive power control performance of any grid-connected converter is presented. The impact of small control disturbances during a testing procedure is monitored, analyzed and converted to meaningful indexes, so that the type and level of coupling is quantified without putting the converter or the grid at risk. The efficiency of the methodology to assess the type and level of coupling is verified experimentally. This is done by assessing several power control approaches with different level of decoupling efficiency on the same power converter connected to a distribution grid. While the assessment is performed with safe, minimal disturbances, its exceptional accuracy is later confirmed by the level and type of coupling observed during significant power step changes.
Highlights
Distributed Generation (DG) penetration in distribution networks causes significant technical and operational issues, besides important energy market changes [1]
The most important issues are the reduced power quality, low inertia, decreased fault levels and power control instability. They rise from the fact that “heavy” prime movers and synchronous generators found in most traditional generation units are replaced with Renewable Energy Sources (RES), or generally DGs, interfaced to the grid with
This paper aims to provide an assessment tool that can quantify the distance between the response of any DG power converter and the control target set by the required P(f )−Q(E) decoupling described above
Summary
Distributed Generation (DG) penetration in distribution networks causes significant technical and operational issues, besides important energy market changes [1]. The most important issues are the reduced power quality, low inertia, decreased fault levels and power control instability. They rise from the fact that “heavy” prime movers and synchronous generators found in most traditional generation units are replaced with Renewable Energy Sources (RES), or generally DGs, interfaced to the grid with “light” power electronic converters. The direct implementation of traditional control techniques (active power controlled by frequency and reactive power controlled by voltage) cannot usually work efficiently due to different feeder properties. The oscillations may significantly affect power quality (grid voltage pattern, frequency, etc.), power allocation among the DGs or even lead to DG unit disconnection under certain
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