Patent ID: 8916992

Claim:
A power generating system, comprising: an engine driven by a fuel; a generator actuated by the engine; an inverter device including a first converter converting an alternating current power generated by the generator into a direct current power, a second converter converting the direct current converted by the first converter into a load alternating current power and being interconnected with an alternating current commercial power source, and a gate drive circuit controlling a switching of the second converter; a control device including a control portion having a central processing unit and controlling the inverter device; a first current detection device provided at the second converter of the inverter device at a side closer to a load, the first current detection device detecting a load alternating electric current of the load alternating current power converted by the second converter; a second current detection device provided between the first converter and the second converter of the inverter device, the second current detection device detecting a direct current of the direct current power converted by the first converter; and a transformer; wherein the control device obtains a first integrated value which is calculated by integrating a direct current component corresponding to a positive electric current positioned at a positive side relative to a zero-crossing of the load alternating electric current among the direct current of the direct current power converted by the first converter and detected by the second current detection device by time, obtains a second integrated value which is calculated by integrating a direct current component corresponding to a negative electric current positioned at a negative side relative to the zero-crossing of the load alternating electric current among the direct current detected by the second current detection device by time, and detects a direct current component included in the load alternating electric current of the load alternating current power converted by the second converter on the basis of a degree of a difference between the first integrated value and the second integrated value, and the control portion adds a voltage signal based on the difference between the first integrated value and the second integrated value for multiple times during a cycle of a timing voltage signal when the timing voltage signal is defined as an alternating current voltage signal inputted to the control portion of the control device via the transformer and is synchronized with the load alternating current power converted by the second converter of the inverter device.