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As a nonlinear control strategy, sliding mode control (SMC) is developed in electrical drivers. Although many new SMC methods have been devised, the research on its response speed and disturbance is still not so much. Consequently, this article established a MPPT controller based on SMC in PV system and studied the controller's performance when light flicker emphatically. Moreover, analysis on the...
In the single-phase grid-connected PV system, considering unity power factor operation, the instantaneous output power consists of a pulsating power with twice the frequency oscillation. PV modules give constant power under MPPT control method when the temperature and sunshine intensity is stable. The instantaneous power imbalance between them is usually solved by a large electrolytic capacitor. However,...
A steady and efficient Voltage Control Current Source (VCCS ) with broad bandwidth plays a very important role in the quality of final images for Electrical Impedance Tomography (EIT) system. Therefore, two models of current source are proposed in the paper: Advanced Howland VCCS and Double Operational Amplifiers VCCS. Both of the two models are simulated through a software named Multisim, and the...
A maximum power point tracking (MPPT) circuit simulation model based on the double index model is proposed in this paper. By analyzing and comparing single index model and double index model, the double index model is more accurate and tallies closely with measured data. Because groups of photovoltaic (PV) cells can be packaged into array, the array model based on double index model can be established...
A N-way dual-frequency power divider designed with genetic algorithm is proposed. The structure of power divider is composed of n two-section transmission line transformers and n isolation resisters. After even-odd mode analysis with ideal transmission-line model, the optimal parameters are obtained with genetic algorithm. In the genetic algorithm, elitist strategy, crossover and mutation of changing...
According to the necessary function of under voltage lock out (UVLO) in DC-DC power management systems, an improved UVLO circuit is proposed. The circuit realizes stabilization of parameters such as threshold point voltage, hysteretic range of the comparator etc. without utilizing an extra bandgap reference voltage source for comparison. The UVLO circuit is implemented in CSMC 0.5??m BCD process....
Rectifying effect will appear in most high-intensity discharge (HID) lamps at the end of their lives, which would lead to overloading of the lamp control gear (ballast, transformer and starting device). Therefore, adequate protective measures should be taken to ensure the safety under this condition. According to the mechanism of rectifying effect, the simulation model of rectifying effect is built...
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