| 摘要 |
PURPOSE:To prevent the fault of the operation of a power converter caused by the synchronous operation because the phase difference is regarded as 0 degree even though the actual phase difference is 180 degrees. CONSTITUTION:Even though the actual phase difference between the signals ed and eq and efd and efq is 180 degrees, a phase comparator 1 is assumed to have outputted the phase difference signal of DELTAtheta=0 degree. At this time, a phase-difference judgment circuit 6 outputs a simulated phase difference signal eLD when the cosine function signal E0cosDELTAtheta of the phase difference DELTAtheta is higher than a specified level. The signal is inputted into an LPF 2 through an adder 7. Therefore, the phase difference is not regarded as DELTAtheta=0 degree, and the fault of the operation of a power converter is prevented. |
