Distributed power generation system and operation method thereof
AssigneePanasonic Corporation
InventorHiroaki Kaku
Life of this patent
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Abstract
A distributed power generation system (100) comprises a power generation unit (104) for generating DC power; a power converter (106) which converts the DC power from the power generation unit into AC power (first power) and outputs the first power to a power load; a power measuring device (108, 109) for measuring electric power (second power) supplied from the power supply utility to the power load; and a controller (107) for detecting an abnormality of the power measuring device; wherein the controller detects the abnormality of the power measuring device based on a change in reactive power of the first power and a change in the second power measured by the power measuring device, when the reactive power of the first power is changed.
Claims9
A distributed power generation system interactively connected to a power supply utility, comprising:
- a power generation unit for generating DC power;
- a power converter which converts the DC power from the power generation unit into AC power (hereinafter referred to as first power) and outputs the first power to a power load;
- a power measuring device for measuring electric power (hereinafter referred to as second power) supplied from the power supply utility to the power load;
- and
- an abnormality detector for detecting an abnormality of the power measuring device;
- wherein
- the power measuring device includes a current measuring device for measuring a current value of the second power and a voltage measuring device for measuring a voltage value between electric wires connecting the power converter to the power supply utility;
- and
- the abnormality detector detects the abnormality of the power measuring device based on a change in reactive power of the first power and a change in the second power measured by the power measuring device, when the reactive power of the first power is changed.
A method of operating a distributed power generation system, comprising the steps of:
- converting DC power from a power generation unit into AC power (hereinafter referred to as first power) and outputting the first power to a power load;
- measuring electric power (hereinafter referred to as second power) supplied from a power supply utility to the power load, by a power measuring device;
- changing reactive power of the first power;
- obtaining a change in the second power measured by the power measuring device before and after changing the reactive power of the first power;
- and
- detecting an abnormality of the power measuring device based on a change in the reactive power of the first power and a change in the second power.
Dependencies are inferred from the claim text.