POWER CONVERTOR FOR WIND POWER GENERATION AND ITS CONTROL METHOD

摘要

PROBLEM TO BE SOLVED: To make generable electric power as efficiently as possible at any wind velocity and any number of revolution of an aerogenerator by performing control for operating the aerogenerator at an optimum operation point in response to variation in the number of revolution of the aerogenerator with the air velocity by adjusting the input impedance of the power convertor as its load. SOLUTION: The input voltage signal V1 of the power convertor 6 detected by a voltage sensor 63, (i.e., the output voltage signal of a power generator 1) is supplied to a multiplier 65. The multiplier 65 is supplied with the (target) proportional coefficient Rref between the input voltage and input current which is generated by a proportional coefficient generator 64. The product output V1×Rref of the multiplier 65 is an input current target value I1ref for actualizing the optimum operation point of the aerogenerator and supplied to a feedback circuit 66. The feedback circuit 66 puts the input current I1 (detected by a current sensor 62) closer to the current target value I1ref by adjusting characteristics (input impedance) of a power circuit 61 for power conversion.