This article proposes a new control method for a pulse-density modulated microinverter and its implementation within a field programmable gate array circuit. The structure and operating principle of the studied microinverter demand implementation of a pulse-density modulation-based control method with two independent control loops. The first one ensures a constant input current from the source while the second one provides a sinusoidal voltage at the converter’s output. At the same time the implemented control method ensures zero-current switching of the utilized power transistors in decoupling and output stages which allows operation at high switching frequency. The performance of the proposed control method for a microinverter operating in island mode was experimentally verified in steady-state operation, as well as during load transients.
D.10 Educational activities
COBISS.SI-ID: 19750678This paper presents the development and implementation of Slovenian National Robotic competitions Robot ROBOsled in RoboCupJunior in 2016, organized by the Institute of Robotics at the Faculty of Electrical Engineering and Computer Science, University of Maribor since 2000 in cooperation with the Slovenian secondary in primary schools. For successful implementation of competitions is an important education issues for the students and their mentors at all levels, from primary school pupils, secondary school students and for the undergraduate students. Which is carried out in the form of thematic workshops in robotics clubs.
D.10 Educational activities
COBISS.SI-ID: 14826523The increasing number of PV systems increases also their influence on the electricity network in which they are connected. The PV systems operation has often a negative impact on the network voltage profile. Fluctuation of clouds causes a step decrease of a solar irradiation and subsequently leads to drastically changes in PV system’s output power in a very short period of time. In areas with a high concentration of PV systems it is to expect the drop of network voltage or even frequency. Problems related to step changes in output power of PV systems are usually solved by using energy storage devices, which are capable to compensate the output power changes. Simultaneously with PV systems charging stations for electrical vehicle appeared in lectricity networks. The most powerful chargers achieve a power up to 120 kW per installed unit and represent a heavy load in comparison to other loads connected to the network in vicinity. In case of a step reduction in PV system’s output power it is possible to lower the charging of electrical vehicles during the transient behaviour in order reduce the overall impact on the electricity network. The paper presents simulation of the PV system disturbance compensation with the temporary decrease in charging power of vehicle connected to the charging station. The results presented show that the proposed compensation can improve voltage profile in the electricity network.
F.04 Increase of the technological level
COBISS.SI-ID: 19612438This paper presents a new kind of DC-DC converter, that is capable of achieving high voltage gain, from electrical sources, with low output voltage and low power, such as in the thermoelectric system with Peltier-Seebeck effects. The used converter is a Switched Capacitor-Boost Converter (SC-BC), tested in open loop as well as in closed loop, using Sliding Mode Control (SMC). The converter has been modelled and tested in simulations with PSIM and verified by experiment, where a voltage gain of approximately 10 was achieved, with a converterʼs input voltage of 4V.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 38609925A serial hybrid drive allows two independent sources of energy, namely the battery system and the generator system. In case of failure of either component, the other can supply reserve power. Furthermore, the electric motor, which is the exclusive propulsion unit of a serial hybrid system, offers increased reliability and reduced maintenance compared to a piston-powered engine. In order to control the hybrid in a way that is both safe and energy efficient, a special human-machine interface shall be designed, developed and validated. The interface allows pilot to intuitively exploit all the benefits of hybrid propulsion while at the same time reduces pilot’s workload as compared to managing a piston engine.
D.01 Chairing over/coordinating (international and national) projects