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The manuscript presents a method of interfacing renewable energy generators (REG) by a new method of maximum power point tracking (MPPT). The method utilizes the nonlinear sum of REG static and dynamic conductances as MPPT loop regulation variable. Static and dynamic conductances are both operating point and environmental variables dependent. Nevertheless, their sum is always zero when the REG operates...
Photovoltaic arrays have been shown to possess significant influence on the dynamic performance of coupled source-converter-load system while its dynamic resistance is the most important parameter, contributing to the overall system dynamics. In this paper, a method of deriving the parameters of linearized photovoltaic equivalent circuit from manufacturer data is proposed. The approach allows predicting...
The manuscript presents a method of operating renewable energy generators (REG) by a new method of robust maximum power point tracking (MPPT). The method utilizes the sum of REG static and dynamic conductances as the main MPPT loop regulation variable. Static and dynamic conductances are both operating point and environmental variables dependent. Nevertheless, their sum is always zero when the REG...
The present article presents an original, compact and powerful electric source, synergistically combining ESB and UC for emergency starting of internal combustion engines. The prototype of this device was created on the basis of an original circuit solution; also, a special algorithm for optimal charging of the UC was developed. The prototype was successfully tested with a diesel engine.
This study proposes a novel method for 3D modeling and calculation of static magnetic fields using user friendly and intuitive shape-generation code (SGC). The method allows numerical and analytical calculations of magnetic fields arising from spatial currents of complicated shapes and does not require special simulation software or specialized knowledge of vector analysis. The method is universal...
A new kind of 8??8 focal plane array (FPA) based on glow discharge detector (GDD) elements was constructed and tested experimentally. First THz images of this FPA are presented. The data acquisition of this system is performed with a special VLSI board designed for this system. Switching mode is necessary in order to save energy and video rate operation. Recent investigations proved that it is possible...
The advantages of imaging at terahertz [THz] frequencies are well known for homeland security applications. It is possible to image through non-highly conducting media, and there is no known biological hazard. Thus, it is possible to image concealed weapons and explosives. There are also many biomedical applications of THz radiation. One problem limiting widespread use is the expense of such equipment,...
In various applications, thermoelectric active cooling systems can help maintain electronic devices at a desired temperature condition better than passive coolers. Thermoelectric coolers (TEC) are especially useful when the temperature of a device needs to be precisely controlled. This study proposes a user-friendly graphical method for calculating the steady-state operational point of a TEC based...
Various power electronics systems, such as resonant converters, motor drives, and electronic ballasts for fluorescent lamps, are driven by carriers of relatively high frequency as compared to the control bandwidth. In these cases, the small signal response relevant to the feedback network design is embedded in the envelope of the signals rather then in the carrier. In this study, a systematic procedure...
The objective of this work was to develop a PSPICE-compatible equivalent circuit of a thermoelectric cooler (TEC). Equivalent circuits are convenient tools for power electronics engineers since they help in presenting a problem in electronic circuit terms and can assist in the design of power stages and the control circuitry and algorithms. A methodology is developed for extracting the parameters...
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