Constant voltage control method for induction generator

摘要

PROBLEM TO BE SOLVED: To control the voltage of an induction generator to be constant, and also, improve the function of the whole system. SOLUTION: IG voltage is controlled to be constant by operating (12) the voltage effective value of an induction motor (IG), and PI-operating (15) the deviation from a set value 13, thereby controlling an inverter 5. Also a reactive current is compensated more speedily than the response by PI operation (15) control, so as to lessen voltage ripple, by converting three phases (18) into two phases, and detecting a d-axis reactive current with a low pass filter 42, and feed-forward-controlling the inverter 5. Moreover, the higher harmonic waves of a load current are converted (182 from three phases to two phases, and are passed through high-pass filters 35 and 36, and are detected as d-and q-axes AC, and higher harmonic current compensation is performed, and also load currents for negative phase are negative-phase converted (19) from three phases to two phases, and are passed through low-pass filters 23 and 24, and are detected as d-and q-axes DC, and negative phase current compensation is performed, thus the heat generation of IG and the inflow of higher harmonic waves to a capacitor for self excitation of IG are prevented.