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A detailed discussion on genesis, determinant and algorithmic method of the harmonic distortion of Switched-Capacitor integrator and Switched-Capacitor based second-order Sigma-Delta modulator is presented. In many instances, people make harmonic distortion analysis of signal through expanding periodic signal into Fourier series or making Fourier transformation for non-periodic signal respectively...
According to the exist problems of traditional electromechanical theory, this paper make new analysis and industrial test on ac motor speed control principle, propose a new power control theory on ac motor speed control, that is ‘P’ theory. This theory is: motor speed control principle comes from mechanical. Speed regulation is the control of mechanical power in nature. Therefore, electric control...
Inverters with distributed storage(DS) play a very important role in a microgrid. A new kind of inverter called virtual synchronous generator(VSG) is proposed in this paper to emulate the behavior of synchronous generator(SG) in the utility. The core algorithm of VSG is to employ an electromechanical transient mathematic model of round SG. There are two important operation modes in microgrid: active...
The tolerance level of the induced-lightning and the trip-out rate of applying different lightning protection measures on 10 kV lines are gotten by emulating in ATPDraw and calculating. Though researching the destiny of the installation of post-arrester, the conclusion is reached that it's no obvious effect on reducing lightning trip-out rate to place post-arresters at intervals. Only if arresters...
In order to solve the problem of field testing the surge protective device (SPD) of the electrical and electronic equipments in low-voltage (LV) power system, this paper proposed a portable field test system for SPD. The tester can output waveform of 1.2/50 μs ~ 8/20 μs combination wave and produce DC high voltage, which can do impulse test and DC detect on SPD. This paper mainly talked about how...
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