DC-AC converter for load supply in autonomous wind-hydrogen power system

Latvian Journal of Physics and Technical Sciences

Raņķis

2018

According to the strategical objectives of the use of the renewable energy sources, it is important to minimise energy consumption of conventional power grid by effective use of the renewable energy sources and providing stable operation of the consumers. The main aim of research is to develop technical solutions that can provide effective operation of the wind generators in the small power DC microgrids, which also means wind energy conversion at as wider generator speed range as possible.

Section: Principles Of the Development Of Wind Energy Based DC Microgridmentioning

confidence: 99%

The Control Principles of the Wind Energy Based DC Microgrid

Latvian Journal of Physics and Technical Sciences

Raņķis

2018

“…The operation principle of the hydrogen ESS was described in [30]. The output voltage of the wind generator DC-DC converter is stabilized to a constant voltage Vd,r, which is the rated voltage of the DC bus ( In the case of overload or wind speed decreasing, the output voltage of the DC-DC converter starts to decrease too.…”

Section: A Operation Principle Of the Hydrogen Energy Storage In Thementioning

confidence: 99%

“…The fuel cell output is stabilized to a lower voltage level (V d,r -ΔV). Both power sources are connected to DC bus through diodes [30], because of the diode included in fuel cell module; therefore, the bigger voltage (wind) provides the power in the intervals 1 and 2 ( Fig. 5) and both power sources are providing power in the interval 3.…”

Section: A Operation Principle Of the Hydrogen Energy Storage In Thementioning

confidence: 99%

See 1 more Smart Citation

Alternative Energetics DC Microgrid With Hydrogen Energy Storage System

Electrical, Control and Communication Engineering

Steiks

2016

Self Cite

This paper is related to an alternative energetics microgrid with a wind generator and a hydrogen energy storage system. The main aim of this research is the development of solutions for effective use of the wind generators in alternative energetics devices, at the same time providing uninterrupted power supply of the critical loads. In this research, it was accepted that the alternative energetics microgrid operates in an autonomous mode and the connection to the conventional power grid is not used. In the case when wind speed is low, the necessary power is provided by the energy storage system, which includes a fuel cell and a tank with stored hydrogen. The theoretical analysis of the storage system operation is made. The possible usage time of the stored hydrogen depends on the available amount of hydrogen and the consumption of the hydrogen by the fuel cell. The consumption, in turn, depends on used fuel cell power. The experimental results suggest that if the wind generator can provide only a part of the needed power, the abiding power can be provided by the fuel cell. In this case, a load filter is necessary to decrease the fuel cell current pulsations.

“…• strategic objectives of the use of the renewable energy sources [1]- [3]; • political aspects [4]- [6]. One of the most important economic benefits of wind power is the reduction of economic dependence on fossil fuel.…”

Section: Introductionmentioning

confidence: 99%

A Methodology for the Estimation of the Wind Generator Economic Efficiency

Latvian Journal of Physics and Technical Sciences

2017

Integration of renewable energy sources and the improvement of the technological base may not only reduce the consumption of fossil fuel and environmental load, but also ensure the power supply in regions with difficult fuel delivery or power failures. The main goal of the research is to develop the methodology of evaluation of the wind turbine economic efficiency. The research has demonstrated that the electricity produced from renewable sources may be much more expensive than the electricity purchased from the conventional grid.