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The development, operational control and evaluation of the events in the power system necessitate different network calculation methods. For load distribution and contingency analysis is used a stationary grid model. The classic load-flow algorithm is an iterative solution for equation system of thousands variables. For the efficient computation of networks containing huge number of nodes and branches...
Oil for electricity generation, burning of coal, heat production is the largest sources of greenhouse emission that cause climate change worldwide. Therefore the diffusion of solar PV technologies has become a crucial component for both climate change mitigation and adaptation of the electrical system on a global scale. In this survey, we analyzed the state of the art of the present large scale Photovoltaic...
The power supply demand can be covered by different portfolios. Nevertheless, the numerous solutions have various social, economic and ecological consequences. The official Hungarian energy strategy focuses on nuclear energy, as the middle and long term plans contain two high capacity nuclear power stations, which should be built during the 2020's and the 2030's, respectively. These steps to the energetics...
We analyze an optimal power flow problem in the case of a scenario where the generators, even assuming continuous operation, do have non-monotone marginal production cost profile. We decompose the operating range of generators into intervals corresponding to operation modes. We show that if in each such interval the production characteristics is approximated by a linear function, a two level optimization...
In the Óbuda University we perform research on Photovoltaic Systems since a decade. For the production forecast the behavior of the PV panels in different lighting situation must be known. We investigate the whole system (PV panel + Inverter) in direct and diffuse illumination. By the analysis of the small- and largescale power plants we found that the diffuse irradiation from sunrise till sunset...
This paper presents details of the mathematical modelling and Matlab simulating of different distributed generators that could be installed in a house and a typical low-voltage (LV) distribution network. Focusing in the area of Stirling Engine based micro-CHP. A mathematical model is the way to describe the system and its performance using mathematical equations. Mathematical modelling has many advantages...
The power mix composition is really important for the price, security and environmental aspects. The different points of view have different optimization objectives. In this approach we investigate the security extended by risk problems. First we assembly a set of risk of the power generation then we build up a risk matrix of the possible set of the generators. After weighting the importance of the...
In the second half of the 19th century Budapest (Hungary) became a metropolis. Huge infrastructural investments formed the city into the present tourist-luring townscape. In 1896 the country celebrated the thousand year anniversary of the statehood and the mayor’s office wanted to raise the glare of the feast with an up-to-date technical solution. Up to that time horse carts, horse tramways electric...
The microCHP devices can have important role in case of stand-alone emergency supply mode. We investigated the possible operational modes and the transitions between the network — island mode and also the load and driving torque change. Also we defined the requirements for the black start capability. Finally we simulated the dynamic changes by MATLAB Simulink. By the simulation we are going to develop...
Investigation of electric operation of solar panels became crucially important field in physics and engineering science. In this paper a new small, laboratory-scale experimental method and arrangement for investigating the wavelength dependent irradiation of solar cells is introduced. Components and the scheme of the setup is discussed in details. Testing and proving the usability and accuracy of...
A strongly developing sector of the small scale photovoltaic (PV) systems are the urban applications. There are a lot of compromise where and how to set up these systems in a crowded city. A lot of limiting constraints such as roof space available, shadow effects, orientation of the roof, etc. Because of the disadvantageous ideal circumstances appear the multi-tilted PV systems, where some strings...
Recently the microCHP (small scale Combined Heat and Power generation unit — mCHP) systems are more common, however these systems don't have any control or protection which would meet the Smart Grid philosophy. Regular mCHP is unable to effectively manage a power outage. In this paper we investigate the base requirements of control and protection system for one (or more) mCHP if we would like to operate...
In this paper we summarize our experiences related to 5 different types of small scale wind turbines in urban environment in power island mode. We made long term wind course measurements, wind climate mapping, energy production measurements, some transient investigation and generator characteristics checking too. We applied also the close and remote wind speed correlation analysis with the extension...
CO2 emission is a corner point of electricity generation. Many optimization techniques are known but the decision makers don't find the right global power mix for the World. The paper investigates the causes of the contradictions related to the traditional optimization techniques: the different priorities, spatial spreading and optimization levels. A new Reverse Weighted Multi Objective Optimization...
The Electric Vehicles (EV) realize the clean and environment friendly traffic. It is true if the EV-s is fuelled by renewable based electricity. One viable energy source is the small and medium scale PV systems. This paper investigates the different PV - EV charger combinations. The concentrated load generated by the EV chargers can overload the existing network or huge developments are necessary...
PV based large scale energy generation has spread significantly. In spite of similar technical parameters the amount of yearly produced energy may differ by notable percents. It results from the operation of solar trackers and also from the different spectral behavior of the different PV panel types. In this paper we introduce a novel on site spectral sensitivity measurement method. The spectral characteristic...
In this paper the Electric Vehicle's (EV's) spatial load forecast is studied, highlighting their current situation in Hungary. The impact of electric vehicles charging on electricity consumption, which generates a concentrated power demand at specific points of the network, is modeled. The extra power requires the development of network capacity, the extra energy requires more power generation. It...
A model has been developed for the simulation of Central-European electricity market forecast for the next 5-10-15 years. This simulator simulates the trade flows that are not equal with the physical flows. In this paper some scenarios are introduced: border capacity change, border cross price change, load and generation capacity changes. The simulation is capable to calculate the long term prices...
The smart grids enable small scale distributed generation. The microCHP has lot of advantage compared to the traditional gas boiler devices. In the next decade the spread of over millions of new microCHPs can be expected worldwide. We built a petrol/NG/PB fueled experimental household unit from a second hand car engine and a squirrel cage induction motor. Taking into account the millions of thrown...
A model is under development for the simulation of Central-European electricity market forecast for the next 5-10-15 years. Taking into account the different development scenarios and the bottle necks, we investigate the compensation flows in the coupled markets and the price trends. A large data set was collected from international forecasts. Based on these data generation capacities and prices,...
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