From the Thyratron to a Mess: A survey on modern power electronics from a power quality view

Cornelis Hendrikus Adrianus Keyer

Research output: ThesisPhD Thesis - Research external, graduation UT

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After the introduction of power control for rotating electric machines with gas filled thyratrons and mercury rectifiers in the mid 1920s power quality was not a problem. After WWII and the invention of the semiconducting; transistor, diode and thyristor, it was still no big issue. Most grid connected equipment were linear devices such as rotating machines, incandescent lighting and heating.

The introduction of the, relatively slow, triac for lighting intensity control
and the increasing usage of VHF radio did not cause any issues with power quality.
But with the increasing usage of high di/dt switched mode power supplies and the increasing use of wireless connections, power quality has become a growing issue.
Almost every domestic appliance nowadays has a switched mode power supply incorporated in the device.
Even alternative energy sources such as Photovoltaic systems and wind turbines use high di/dt inverters.

The inherent asymmetry of appliance and mains cables make these cables effective radiators, for conducted emissions and because of the lack of standards for 2 kHz $\leftrightarrow$ 150 kHz, there is an increasing problem of interference between power quality and wireless communications.
These problematic currents are even causing faulty meter readings in modern static energy meters. This thesis contributes to the understanding of power quality problems in several areas of renewable energy sources and modern lighting.
Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
  • University of Twente
  • Leferink, Franciscus Bernardus Johannes, Supervisor
Award date18 Jun 2021
Place of PublicationEnschede
Print ISBNs978-90-365-5182-3
Publication statusPublished - 18 Jun 2021


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