| Voltage control has crucial impacts on the security, stable and economical operation of the overall power system, and it is a key indicator of the electricity quality of the power grid. The thesis aims to deduce from the power grid voltage3level voltage control mode the3level voltage control mode for power plant side. On this basis, the thesis would further put forward the model and control strategy of the automatic AVC voltage control device for power plant side by applying the automatic voltage control principle for power plant side. While making analysis of the traditional algorithm, the thesis would at the same time make an effort to improve the algorithm for system impedance to come up with the system self-identification based on least square method, and finally, combined with theories and practice, accomplish the R&D and test of the AVC device through the CyberControl and CyberLogic configuration software. The thesis is devoted to make a forward-looking research on the theory basis of the device, and plans to introduce low-frequency oscillation detection function into it, Prony algorithm and FFT (fast Fourier transform) algorithm through simulation comparison, and establish the systematic low-frequency oscillation identification method based on FFT. |
PDF Full Text Request