SYSTEM-INTERCONNECTED INVERTER DEVICE, COMMUNICATION DEVICE AND ELECTRIC CURRENT GENERATING METHOD

摘要

PROBLEM TO BE SOLVED: To prevent deterioration in the quality of generated electric current by stabilizing control for generating generated electric current in a structure of outputting electric current generated from generated electric power to a power system.SOLUTION: A system-interconnected inverter device comprises: an electric current generating unit 33 for generating generated electric current from generated electric power and for outputting the generated electric current to a power system; a zero-cross detection unit 71 for detecting zero-cross timing indicating system voltage being zero volt; a target electric current setting unit 7 for setting a target value of the generated electric current on the basis of the zero-cross timing; an electric current adjusting unit 5 for adjusting the generated electric current on the basis of the system voltage and the difference between the target value and the electric current generated by the electric current generating unit 33; and a zero-cross period setting unit 4 for setting a zero-cross period on the basis of the zero-cross timing. The electric current adjusting unit 5 corrects the difference to a value whose absolute value is smaller than the difference and whose sign is the same, or zero in the zero-cross period, and adjusts the generated electric current on the basis of the difference after the correction and the system voltage.