Parallel inverter system
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsYushin Yamamoto, Joji Kawai
Life of this patent
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Abstract
A parallel inverter system has a plurality of AC output inverters of an instantaneous voltage control type, a bus for connecting outputs of the inverters to a load so as to share the load current, a detection circuit for detecting a cross current component in a current flowing among the inverters, and an instantaneous voltage control circuit for controlling the output voltages of the inverters. In response to a signal in accordance with the detected cross current component from the detection circuit, the voltage control circuit inserts a virtual impedance between the inverters so as to suppress cross current.
Claims8
A parallel inverter system, comprising:
- a plurality of AC output igniters of an instantaneous voltage control type;
- a bus for connecting outputs of said plurality of inverters to a load so as to share a load current;
- first detection means for detecting a cross current component in a current flowing among said inverters;
- and
- control means for controlling output voltages of said inverters to suppress the cross current component detected by said first detection means said control mans including a virtual impedance circuit which has a predetermined impedance with respect to the cross current and a low impedance with respect to current components other than the cross current.
A parallel inverter system, comprising:
- a plurality of AC output inverters of an instantaneous voltage control type;
- a bus or connecting outputs of said plurality of inverters to a load so as to share the load current;
- first detection means for detecting a cross current component in a current flowing among said inverters;
- and
- control means or controlling output voltages of said inverters including a virtual impedance circuit which as an impedance sufficient to suppress the cross current component detected by said first detection means.
Dependencies are inferred from the claim text.