| 摘要 |
PURPOSE:To lengthen the sampling period by performing the pulse-duration modulation control of the power converter so as to get in the same phase in power running and in the opposite phase in regenerative running based on the voltage signal of the AC power source and the current signal of the reactor. CONSTITUTION:The crest value of the voltage on AC side and the voltage phase difference with AC power source 1 are operated by a control circuit 20 in a power converter 3, which is controlled by PWM gate output circuit 30 based on the both signals Vcm and theta, and the voltage signal Vs of a voltage detector 15. At this moment, the control circuit 20 is composed of the first operational element generating the requirement power signal on DC side, the second operational element generating the phase correction voltage signal as well as the crest value detector of the AC power source 1, and the third operational element generating the crest value signal Vcm and the phase difference signal theta to get in the same phase in power running and in the opposite phase in regenerative running. Thus, no inputs, etc. become necessary for the instantaneous value for alternating current, etc. and the microprocessor can easily be applied thereto. |
