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In this article, a droop control algorithm is proposed for power distribution between sources in an island inverter-based microgrid without common central control. The analyses of the line impedance influence (resistive, inductive, and combined) are provided to show the impact on the power flow between a grid and a converter. Line impedance character influences the droop control algorithm performance. The impact of the accuracy of the setting, concerning line impedance, of the proposed droop control algorithm is then tested in a simulation. For the simulation, a microgrid model was built in the Simulink environment (MATLAB) with the PLECS toolbox. In the conclusion, the potential benefits and applications of the proposed droop control are discussed.

The model predictive control is a set of algorithms which uses the dynamical model of controlled system to predict the future systems responses. Nowadays, the nonlinear finite control set model predictive control (FCS-MPC) is a popular technique for control of induction motor drives. The FCS-MPC enables accurate and high-dynamic control of the induction motor currents, rotational speed, torque etc. with respect to system constraints (e.g. urrent/voltage limitations). The main drawbacks of FCS-MPC algorithms are their computational requirements which reduce FCS-MPC prediction horizon and its applications. Our paper is focused on the FPGA accelerator of FCS-MPC of induction motor extended by the three phase inverter model with dead-times and voltage drops. These inverter nonlinear effects play important role especially in nonnominal drive conditions (e.g. low speeds).

This paper deals with new configuration of the traction converter with medium-frequency transformer intended for ac trolley wire fed locomotives. It is concerned to the primary serially connected single-phase voltage-source active rectifiers, which are directly connected to the trolley wire. This contribution presents the proposed control of the primary active rectifiers, simulation and experimental results of designed low-voltage laboratory prototype of converter of rated power of 12kW.

The paper deal with using of the fuel cell as a alternative electric source in light traction branch. The fuel cell is simulated by equivalent electric diagram and this diagram is used for simulation of the light traction drive. The next part is concern to control of power converters, which are necessary for the electric power source well operating.

This contribution deals with new configuration of the traction converter with medium-frequency transformer intended for ac trolley wire fed locomotives. The main objective of this paper is the control of primary voltage source active rectifiers connected in series and operated on the primary side of medium-frequency transformer. This paper present simulation and experimental results of designed low-voltage laboratory prototype of rated power of 12 kW.