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To solve the low sensitivity and reliability of single-phase-earth signal detection, a novel fault line measuring and recognition method is proposed in basis of duffing oscillator theory which is sensitive to the special frequency signal and immune to noise. The fifth harmonic current is defined as measured parameter and added duffing oscillator equation. Then, the single-phase-earth line is detected...
In order to overcome the problem of poor filtering by using traditional PI control for dc-link voltage of shunt active power filter (SAPF), an adaptive fuzzy control method is proposed. Firstly, a fuzzy controller is designed which contains two inputs and one output. The two inputs are error and error rate is between reference dc-link voltage and the actual voltage of capacitor, and current amplitude...
To improve the quality of output power of VSIG grid-side converter under the working condition of asymmetric load, this paper, based on the instantaneous symmetrical component method, studies double closed loop control strategy under synchronous rotating coordinates of positive and negative sequence, and designs corresponding decoupling strategy. In order to further curb disturbance of asymmetric...
In this study, the Arduino is used to build a low-cost data acquisition card with its sampling frequency of up to 50k Hz, so sampling frequency can also be applied to adjust the signal measurement of different frequencies through the program. In this paper, utility power signals are used to measure the target, and the analog signals captured through Arduino from the measured power transport signals...
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