DC/AC inverter controller for solar cell, including maximum power point tracking function
First Claim
1. A DC/AC inverter controlling system used in a solar cell power source, comprising:
- DC/AC inverting means for inverting DC (direct current) power derived from the solar cell power source into AC (alternating current) power to be supplied to an AC power line;
power variation determining means for determining if a rate of change in the AC power outputted from the DC/AC inverting means exceeds a predetermined rate of change and outputting a power variation determining signal indicating if said rate of change in said AC power exceeds said predetermined rate of change; and
power controlling means for controlling the DC/AC inverting means so as to reduce said rate of change in the AC power to substantially zero and to maximize the AC power outputted from the DC/AC inverting means, when said power variation determining signal does not indicate that said rate in change in said AC power exceeds said predetermined rate of change.
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Accused Products
Abstract
A DC/AC inverter controlling system controls a DC/AC inverter so as to continuously output maximum AC power thereof, taking account of solar energy generated from a solar cell. The DC/AC inverter controlling system comprises: a DC/AC inverter unit for inverting DC (direct current) power derived from the solar cell power source into AC (alternating current) power to be supplied to an AC power line; a power variation judging unit for judging whether or not a variation measured during a predetermined time period and occurring in the AC power outputted from the DC/AC inverter unit, exceeds a predetermined value, thereby producing a power variation judging signal; and a power controlling unit for controlling the DC/AC inverter unit so as to reduce the power variation to substantially zero in response to the power variation judging signal, while the power variation does not exceed the predetermined value. As a result, the AC power outputted from the DC/AC inverter unit becomes a maximum value thereof.
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Citations
9 Claims
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1. A DC/AC inverter controlling system used in a solar cell power source, comprising:
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DC/AC inverting means for inverting DC (direct current) power derived from the solar cell power source into AC (alternating current) power to be supplied to an AC power line; power variation determining means for determining if a rate of change in the AC power outputted from the DC/AC inverting means exceeds a predetermined rate of change and outputting a power variation determining signal indicating if said rate of change in said AC power exceeds said predetermined rate of change; and power controlling means for controlling the DC/AC inverting means so as to reduce said rate of change in the AC power to substantially zero and to maximize the AC power outputted from the DC/AC inverting means, when said power variation determining signal does not indicate that said rate in change in said AC power exceeds said predetermined rate of change. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification