The paper deals with a generalized description system of the two level inverter. Two methods of mathematical approach to the representation of the converter's state are presented and discussed. One method is standard space vector and the other, originally designed by authors, is state vector representation. The notational system provides a general simplification and standardization of vectors identification. It contains a novel handy proposal of notation and marking which is useful for converter description. The notation system permits to accomplish a comparison and correlation between space and state vectors. It describes state and space vectors by use of the same numbers. Thanks to these properties the proponed mathematical tool can be extremely useful in designing the control algorithms for easy implementation and fast performance of the converter Key words two level converter control, converter model, control algorithm, state vector, space vector.
The paper presents a case study on development of the high power compensator of the power grid irregularities. The compensator is dedicated for sensitive industrial installations protection against dips, sags and short duration interruptions in public power network. The energy for compensation will be stored in bank of high voltage stacked supercapacitors. The development of the new high power medium voltage compensator will be based on experience gained during the realisation in The Electrotechnical Institute Gdansk Branch a similar medium power low voltage device. The study includes: main power converter topology considerations with some preliminary simulation results including harmonic components discussion, the solution to the problem of fast identification of the grid voltage disturbances, the solution to the problem of compensator waveforms synchronization with the grid and the description of the main operational algorithm of the compensator.
When it comes to the implementation of e-mobility (electro-mobility) solutions, Norway is a world leader. The scientific expedition to the Norwegian fjords, organised as part of the ELMAR project in 2018, created an opportunity to visit selected passenger ferries and car and passenger ferries. The experience gained by the authors during that visit is presented in this article.
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