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Here we show that various effects of systems behavior looking intellectual may be considered as the consequence of the systems special structures. These effects are such as self-organizing processes in robots groups or insects colonies, self-adaptation in business processes of distributed systems and organizing processes in self-adaptive systems at all. We describe systems by special graph structures...
The article presents the identikit approach to requirements justification for design characteristics and evaluation of the flight capabilities of the next-generation vehicles. It is demonstrated that in the “question-answer” mode it is possible to effectively sort out various vehicles configurations options; dimensional and aerodynamic characteristics; onboard equipment, controls, communications and...
An approach for systems integration and components of advanced technology under the changing landscape of the global energy economy is shown. The paper presents the basic procedure for determining the adaptive infrastructure solutions in the implementation of intellectual environment of multiaspect modeling (virtual semantic environment). The relevant techniques for systems integration and simulation...
The sliding mode control technique applied to the drive control is analyzed in terms of dynamic response and energy saving in a stand-alone network. The drive is equipped with a surface-mounted permanent magnet synchronous motor fed by renewable power through a voltage-source inverter. The design of sliding mode control is presented and it is shown that the developed control eliminates the influence...
The popularity of renewable energy sources is increasing. It is a reason for development of technologies, particularly for micro hydropower plant. The paper presents control solutions for induction generator. The main goal of control is stabilization of the output voltage and frequency in island mode by variable load especially. One of the most popular solutions of voltage control is a switching of...
The sliding mode control technique applied to the drive control is analyzed in terms of dynamic response and energy saving in a stand-alone network. The drive is equipped with a surface-mounted permanent magnet synchronous motor fed by renewable power through a voltage-source inverter. The design of sliding mode control is presented, and it is shown that the developed control eliminates the influence...
The induction machine in the operating mode of generator is a very valuable alternative to the synchronous machines. Especially in lower nominal power rating range, such solution can be more cost effective. Induction machine with a squirrel-cage rotor cannot generate a reactive power and even more it is a permanent consumer of the reactive power. In this paper, we strive to define theoretical limits...
One of the key problems of modern power engineering is the fast increase in electric power demands (It is expected to double by 2030). However this needed growing of power generation has to be received by reducing the carbon dioxide emissions that there is by using of traditional nonrenewable energy sources and is is a key source of the greenhouse effect. One of solving ways for above-mentioned problems...
A possibility of using the sliding mode technique for elimination of the influence of instability voltage source on the stand-alone drive behavior is discussed. For the AC drive that has an exterior permanent magnet synchronous motor and a classical two-level voltage source inverter the conditions of the sliding mode existing guaranteed elimination is presented. The designed control is analyzed.
Solar and fuel cells are widely used, as renewable electrical power source need transformer-less DC/DC coupling converters. One of the promising types of DC/DC converters is the D-square DC/DC converter that extends significantly the conversion range in comparison with a classical DC/DC converter. Two control strategies: the traditional modulation and the sliding-mode control, for a novel D-square...
A novel D-square DC-DC converter, which makes it possible to control the mean voltage across the output from zero to input voltage with a quadratic dependence on the duty cycle is analyzed. This enables a high load current at low output voltage with better efficiency. The control features of such a type of converter are discussed in this paper. Switching structures of a DC drive fed by the presented...
One of the most promising technologies for the non-carbon based electricity production is solar photovoltaics. Novel power electronics devices and converters together with new control concepts in the frame of “green electronics” are necessary. For a novel buck-boost converter two controls that make it possible to control the mean value of the output voltage, this is e.g. the voltage across a DC machine...
The transition to renewable energy source due to reduction of traditional energy sources and greenhouse effect that a carbon dioxide emission is connected with new requirements related not only to energy source itself but also to its effects on the power-system operation. Energy source physical natures and state of technologies used for electrical power production must be taken into account. The effective...
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