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AssigneeCanon Kabushiki Kaisha
InventorsNobuyoshi Takehara, Hiroshi Kondo
Estimating the term…
An AC interconnection apparatus has an input terminal for a commercial power system, a connection terminal to a solar cell, an output terminal connected to a load, an inverter for converting the output voltage of the solar cell into an AC voltage, and a current detector arranged on the load side of an AC connection point for connecting the AC output from the inverter and the commercial power. When a power value calculated on the basis of a current detection value by the current detector and the voltage of the commercial power system is less than the output power of the inverter, the output of the inverter is suppressed, thereby suppressing reverse power flow to the commercial power system. When the current value detected by the current detector exceeds a predetermined value, power supply to the load is stopped using a breaker.
An AC interconnection apparatus for supplying to a load both AC power from a commercial power system and an output from a solar cell, comprising:
An AC interconnection apparatus for supplying to a load both AC power from a commercial power system and an output from a solar cell, comprising:
An AC interconnection apparatus for supplying to a load both AC power from a commercial power system and an output from a solar cell, comprising:
A control method for an AC interconnection apparatus for supplying to a load both AC power from a commercial power system and an output from a solar cell, comprising:
A control method for an AC interconnection apparatus for supplying to a load both AC power from a commercial power system and an output from a solar cell, comprising:
A control method for an AC interconnection apparatus for supplying to a load both AC power from a commercial power system and an output from a solar cell, comprising:
An AC interconnection apparatus for supplying AC power to a load from a commercial power system and/or an output from a solar cell, comprising:
Dependencies are inferred from the claim text.
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Arrangements for feeding a single network from two or more generators or sources in parallel; Arrangements for feeding already energised…
Solar energy: photovoltaics
Photovoltaic [PV] energy: power conversion systems, e.g. maximum power point trackers
Electricity: power supply or regulation systems: solar cell systems
Term end not estimated
The present invention relates to an AC interconnection solar power generation apparatus and control method therefor.
An example of the use form of a solar power generation system is a DC interconnection system disclosed in Japanese Patent Laid-Open No. 5-108176. In this system, the output from an AC/DC converter 100 that receives commercial power 2 and the output from a solar cell 3 are connected, and the DC power thus obtained is converted into AC power by an inverter 110 and supplied to a load 4, as shown in FIG. 9. Such a system form can be regarded as a simple “load” from the viewpoint of preventing any reverse power flow to the commercial power system. For this reason, when deregulation about electric power greatly progresses in the future, individuals can freely use such a solar power generation system.
In the prior art, however, the capacity of the load 4 is limited by the capacity of the inverter 110. In addition, no measures are taken against unnecessary current leakage of the solar cell 3 due to the stray capacitance to ground, i.e., no device for safety use of the solar cell 3 is disclosed.
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
FIG. 1 is a block diagram showing the arrangement of an AC interconnection apparatus according to the first embodiment of the present invention;
FIG. 2 is a view showing the outer appearance of the AC interconnection apparatus according to the embodiment of the present invention;
The preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
<First Embodiment>
[Outer Appearance and Connection Terminal]