Tag Archive for: POC

Interaction between Grid-Connected PV systems & LED Lamps: Directions for Further Research on Harmonics and Supraharmonics

This paper discusses different approaches to investigate the interaction through harmonics, interharmonics, supraharmonics, and light flicker, between photovoltaic (PV) inverters and LED lamps in low-voltage installations. Single grid connected power generators and electronic loads like LED lamps can be easily characterized in terms of harmonics in a given range of frequency. This subject is relatively well understood, and specific standards for measuring and restricting emissions are already established to ensure a low probability of interference. However, when connected together, source and load exhibit behavior that requires further study and understanding. This work presents a discussion serving as a guide for future work on analysis of losses and other impacts of the disturbances regarding this specific load and source interaction. The following are taken into account: the nonlinearity of LED loads and PV converters; the technologies and methods used in control; and the changes in power flow caused by load and power production variations. Index Terms  – electric power systems, power quality, harmonics, supraharmonics, solar power.

From PQTBlog

Published by:

  • Tatiano Busatto, Fahim Abid, Anders Larsson and Math H. J. Bollen, Electric Power Engineering, Luleå University of Technology, Skellefteå 931 87, Sweden, @mail: tatiano.busatto@ltu.se
  • Gaurav Singh, Department of Electrical and Computer Engineering, Clemson University, Clemson, South Carolina 29634, USA, @mail: gauravs@clemson.edu 

Conference Paper: 16-19 Oct. 2016, Belo Horizonte, Brazil.

Published in 2016 17th International Conference on Harmonics and Quality of Power (ICHQP)

Introduction

With the constant development, the inclusion of new energy sources and consumption devices becoming increasingly complex, a broader understanding is required of the interaction between these elements and the electrical system. In this context, the use of distributed energy Read more

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The use of suitable current transformer sensors pays off

Accuracy of the measurement questioned.

Measuring instruments are usually classified according to standards and accuracy. Accuracy is an important indicator for being able to usefully build on a solid measurement result in the analysis and its resulting measures. However, it can be observed that although the measuring devices used correspond to a required accuracy class, the necessary sensors are often less in focus.

It can be seen that although class A measuring devices used in power quality applications correspond to a data sheet accuracy of 0.1% for U/I and 0.2S at the energy meter, upstream current transformers are often designed significantly worse (e.g. 0.5% or worse). And this is apart from the fact that not only accuracy plays a role in power quality measurements, but also the inevitable compatibility against harmonics – one of the modern and growing main players in power quality. Read more

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PQ Easy Report – Conformity reports at the touch of a button

 

With the “PQ-Easy Report”, statistical reports can be generated directly from the measuring instrument, either according to standard or also user-specific. And this completely autonomously and detached from proprietary software solutions that make life difficult for many users as well as the IT department.

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