by D. K. Srivastava, V. K. Singh and R. Senani
Original Research
A simple CMOS-compatible linear voltage controlled oscillator (VCO) has been presented which employs a single CFOA, four MOSFETs and three grounded capacitors as preferred for IC implementation. In the proposed circuit, variable frequency oscillations are obtained by simultaneous variation of two voltage-controlled-resistors in the circuit which appear in the expression for oscillation frequency in the product form but appear as a ratio in the condition of oscillation (which therefore, remains unaffected). The workability of the proposed VCO has been confirmed by SPICE simulations using an exemplary CMOS CFOA and CMOS VCRs both implementable in 0.18µm CMOS technology.
American Journal of Electrical and Electronic Engineering. 2017, 5(6), 202-206. DOI: 10.12691/ajeee-5-6-2
Pub. Date: January 16, 2018
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by Wang Ying, Ma Gang and Tang Yi
Original Research
As one of the core algorithms for safety and stability evaluation of the power grid, the method has been used by many scholars to analyze and control the stability of power grid. A method based on deviation correction is studied to track Thevenin equivalent parameters. This is an iterative algorithm based on the correction of the amount of deviation. The direction of the correction is determined based on the real-time data, and the parameters of the real-time estimation are obtained by iterative correction of the Thevenin equivalent parameter. It is possible to accurately track the Thevenin equivalent parameters when the system is disturbed to achieve an accurate analysis of the voltage stability.
American Journal of Electrical and Electronic Engineering. 2017, 5(6), 195-201. DOI: 10.12691/ajeee-5-6-1
Pub. Date: December 11, 2017
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