| 摘要 |
PROBLEM TO BE SOLVED: To provide an inverter control device interconnected to an AC system via a transformer, the inverter control device being configured to reduce DC magnetic deflection using a low-priced current sensor.SOLUTION: The inverter control device comprises: an adder which adds a detection current of a current sensor 3 for detecting a primary current outputted from an inverter 2 to a transformer 4 and a delay current obtained by delaying the detection current by an odd multiple of 0.5 cycle of the detection current and extracts a DC excitation current component; a magnetic deflection detector which detects the presence/absence and a direction of magnetic deflection of the transformer from the DC excitation current component extracted by the adder and obtains a magnetic deflection correction amount; a subtractor which subtracts the magnetic deflection correction amount of the magnetic deflection detector from an inverter drive signal and obtains an inverter drive correction signal; and a gate signal generation circuit 11 which obtains a gate signal of the inverter based on the inverter drive correction signal. Thus, the DC magnetic deflection of the transformer is reduced.SELECTED DRAWING: Figure 1A |
