Jan Moravek

HYBRID ENERGY SYSTEM - OPTIMIZATION AND NEW CONCEPT

Paper presents a research related to the design of a new concept of hybrid energy system. It describes actually used concepts and the benefits of new design. Subsequently, the problems of the proper systems setting and working conditions are discussed and the new concept of the systems settings is presented. Research is further enhanced by comparing with the simulation model assuming the weather data acquired for the test location. The measured data are compared with the results of simulation.

Concept of fast charging stations with integrated accumulators — Assessment of the impact for operation

The urgent need for the development of charging stations for hybrid cars and electric vehicles (EV) still shows as important in the context of the current gradual development of this type of transport. The paper contains an energy analysis of the concept of charging stations with integrated accumulators and renewable energy sources. Based on the concept are developed mathematical models. It was performed energy-economic analysis in order to verify the possibility of using the concept in this way to reduce the load of the network at the connection point.

Power quality issues related to power flow control in systems with renewable energy micro sources

The paper is focused on power flow control in energy systems with grid-on renewable energy sources employing time-proportional controlled and phase angle controlled resistive loads (like boilers) to balance energy produced by the sources. The system operational properties are described and major mechanisms affecting power and voltage quality are identified. Contributions of the pulse-width regulated loads to voltage flicker, system harmonics and to high frequency conducted disturbances in audio range (2-250 kHz) are studied on a test system realized in a small laboratory measure. Finally, on the basis of experimental results, limiting power of regulated resistive loads from point of view of flicker and harmonic current emissions is estimated.

Modeling the energy systems in Matlab Simulink - problematics of energy system control

The paper presents the models of the individual elements in the energy system created in Matlab Simulink. The reason for modeling energy system is the prediction of the behavior of individual subsystems. In cooperation with the validated models are solved the operational problems and power quality issues that are further discussed.

Model of PMSG wind turbine in hybrid energy system

This paper presents a model of three-blade wind turbine, which is used to compare the outputs from the model with the real measured data. Functional model is important to simulate multiple different states and its behavior in the hybrid energy systems and can be used to predict the power generated within these systems.

Operational characteristics of photovoltaic systems

Current efforts to open up the practical education to broad group of interested students, leads to still greater development of so called virtual laboratories. E-learning is becoming an important part of teaching at universities. The paper describes one of the developed laboratory exercises, which was created with the intention of remote access. It is a photovoltaic system with the accumulation of power, where the students can simulate various operating conditions. The idea creates a virtual laboratory tasks have established according to the actual situation in the development of energy systems with renewable energy sources which is currently in the spotlight. Czech Republic is no exception in this regard. Dynamic changes which happened in legislation concerning photovoltaic systems opened up the possibility of increased development of hybrid energy systems.

Mathematical model of fast charging station with integrated accumulators impact on low voltage distribution network

In connection with the development of infrastructure for electric vehicles (EVs) is in this article presented complex mathematical analysis of operation fast charging station (FChS) with integrated battery and by promoting of photovoltaic (PV) system. The goal of presented simulation of operating conditions was to demonstrate possibilities (advantages and disadvantages) of integrated batteries during operation of FChS and their possible impact on the connection point to the low voltage (LV) electric network.

Photovoltaic power plant inspection and diagnostic

This paper presents methods of photovoltaic panel inspection in the field. The aim is to verify value of on-site tests. The basic parameters for comparing the quality of photovoltaic panels are indicated by the manufacturer’s datasheet. Diagnostic in the field commonly uses a combination of different analyzers and infrared cameras. The paper compares the evaluation of the parameters at different climatic conditions by special photovoltaic analyzer, conventional analyzer with recalculation according the IEC standards and flash tester. The comparison of different methods and analyzers has been performed with the practical experience from the measurements. Further, the standards for the inspection of photovoltaic panels and best practices for their implementation are described.