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Smalt photovoltaic plants in private ownership are typically rated at 5 kW(peak). The panels are mounted on roofs at a decline angle of 20° to 45°. In winter time, a dense layer of snow at a width of e.g. 10 cm keeps off solar radiation from the photovoltaic cells for weeks under continental climate conditions. Practically no energy is produced over the time of snow coverage. Only until outside air...
Electrical energy exhibits highest flexibility in usage and controllability. However, electrical energy also raises high cost in generation and storage and is not sustainable in most cases for generation (burning coal or oil, or nuclear reactors). Advanced and sustainable generation employs power electronics in various circuits and power ranges. By today, large water power pump turbines with synchronous...
Standard multilevel inverters offer high quality output voltages at small voltage steps even without using additional filter equipment. Voltages of separate converter stages can be added by series connection of transformers. However, the number of individual switches to be controlled precisely and at given sequence is a heavy burden for control. The hardware expenditure of standard circuits is rather...
Up-to-date education shall prepare students for work in industry in an optimal and efficient way. Through the project described students are taught basics of renewable energy problems, details of electric vehicles and their power supply and power train, several types of high-efficiency power conversion methods, system design and circuit layout, all with practical realization and actual test. Going...
Renewable energy generation strongly relies on wind power aside from water power plants. Technical and economical growth rules ("The larger, the better") yield systems of increasing power now far in the Megawatt range. Wind power rotor blades have to withstand high mechanical stress by standard and disturbed operation through centrifugal and power transmission forces. Especially, heavy wind...
A special four-level three-phase diode clamped inverter fed by a correspondingly adapted untypical three-phase rectifier with two typical transformers is presented. The three-level rectifier is formed by consecutive connection of three rectifiers under the circuit of Scott for the bi-phase orthogonal voltage received from corresponding windings of two three-phase transformers. The inverter is realized...
From system control point of view, asynchronized synchronous motor is a complex nonlinear plant with uncertainties, and is hard to be controlled by traditional control method. An excitation control method based on model reference adaptive control of asynchronized synchronous motor using neural network on-line identification is proposed in this paper. This method utilizes the mapping abilities of neural...
Education should be oriented to scientific and practical applications. Therefore, we propose students to study with methods "learning by doing", "project based training" and "solving problems in an efficient way". Through this we introduce them to industry style development work. This paper describes the process how we teach students to learn development activities by...
Energy management becomes more and more important with respect to rapid increasing energy costs. Exact analysis of all installed electrical loads of a company is the basic requirement for starting and realising energy-saving measures. The proposed cost-effective mobile portable measuring system is composed of a standard notebook with PCMCIA slot, a data acquisition PCMCIA card and signal interfaces...
A special four-level three-phase diode clamped inverter fed by a correspondingly adapted untypical three-phase rectifier with two typical transformers is presented. The three-level rectifier is formed by consecutive connection of three rectifiers under the circuit of Scott for the bi-phase orthogonal voltage received from corresponding windings of two three-phase transformers. The inverter is realized...
Education should be oriented to scientific and practical applications. Therefore, we propose students to study with methods "Learning by Doing", "Project Based Training" and "Solving Problems in an Efficient Way". Through this we introduce them to industry style development work. This paper describes the process how we teach students to learn development activities by...
From system control point of view, asynchronized synchronous motor is a complex nonlinear plant with uncertainties, and is hard to be controlled by traditional control method. An excitation control method based on model reference adaptive control of asynchronized synchronous motor using neural network on-line identification is proposed in this paper. This method utilizes the mapping abilities of neural...
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