I. Vesely

The efficiency of a microgrid hydrogen circuit

The paper discusses the efficiency of a microgrid hydrogen circuit. We measured and calculated the energy efficiency values to describe two main sources of low efficiency. The principle of the proposed design consists in improving the stability of a direct current microgrid and enabling the maximum exploitation of the electric energy produced by renewable sources. The circuit is composed of a microhydropower plant, solar panels, and wind power plants. In this respect, we present a module to save the energy, proposing an efficiency calculation procedure for the hydrogen circuit.

Structure of the Smart Energo model control system

The paper describes two levels of control that are used for an efficient transfer of energy in a Smart Grid (a lower and higher level). This grid consists of several storage sites and resources. Each part of the model simulates various uses of resources or a storage. The lower level of control handlesa safety of the system and a fundamental moving of energy. The aim of control higher level is to use and store as many energy from sources as possible. It uses a weather forecast for a prediction of energy production. Control strategy is selected from obtained data, so storage sites have enough space for storing.

Parameter identification of PMSM

The following paper describes an identification of quadrature inductances of a permanent magnet synchronous motor. This identification is a frequency analysis base on an injection of a harmonic signal to control. This method utilizes knowledge of synchronous motor schema in d-q coordinates and it is based on mutual signals correlation. This method is primary an offline method. But in this paper it is used as an online method. The algorithm was tested on a real motor through a real time platform D-space.