Power quality analysis for high pressure sodium lamps in low voltage networks

Unaware connection of high pressure sodium lamps to the grid, represent a relevant problem for the grid operators. They have several negative effects in the network, they can overload the circuits and affect the quality of the energy delivered to customers by the injection of harmonics. This thesis aims to answer the question: Can the high...

Fault Location Algorithms for Electrical Power Transmission Lines

Electric power transmission lines are used for delivering electricity to consumers at their homes, offices and industries. It is important to ensure a smooth operation of transmission lines to deliver a minimally interrupted power supply making necessary for reliable operation of electrical power lines. This need has given rise to Fault Location...

Detection, characterization and extinction of electric arcs in DC Systems

Advancements in power electronics has sparked the adaptability of dc systems in varied application fields. The phenomenon of electric arcing in such dc systems, arising due to the absence of zero crossing of current during normal operation, has impeded the widespread proliferation of dc-based technologies in the market. Considering the...

Emitter Switching for Power BJT Based LED Drivers

In recent years, the LED lighting developed rapidly because of its superior efficiency, eco-friendliness, and longer lifetime compared to the fluorescent and its incandescent counterparts. As the core of LED systems, LED drivers need to be well designed in order to properly drive the LEDs with high efficiency, high reliability, long lifetime,...

Increasing the Functional Safety of Safety-Critical Systems in the 48 V Network

In 2011, AUDI AG and four other German car manufacturers decided to implement an additional 48 V on-board power network inside cars. This offers the opportunity to increase the number of electrical applications in the car, to increase the fuel efficiency and to decrease the CO2 emissions. In order to achieve this, the current electromechanical...

Impact of Large Amounts of Photovoltaic Installations in Low-Voltage Networks on Power System Stability During Transmission System Faults: A German Case Study

It is expected that the share of renewable energy sources will increase to meet rising demand. One of the challenges integrating this distributed generation (DG) into the power system is the behaviour of low voltage connected DG in case of a transmission system fault. This research aims to give recommendations for low voltage (LV) grid codes to...

Multilevel Converters for Offshore Wind Systems: A comparative study

Offshore Wind systems have recently gained popularity. However, as the distance from shore increase, different challenges arise. The use of HVDC link to shore helps to overcome most of the challenges. Current Source converters have long been used as HVDC converters despite of their large footprint and reactive power consumption challenges....