Power supply system
A technology of power supply system and power system, applied in the direction of control/regulation system, circuit, collector, etc., can solve the problems of reducing conversion efficiency, achieve the effects of prolonging life, reducing equipment investment, and simplifying the system
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no. 1 example
[0098] The power supply system of the first embodiment includes: a DC power supply string in which storage batteries are connected in parallel to the DC power supply; a DC / AC power conversion device for connecting the DC power supply string to a power system or a load; and between the DC power supply and the storage battery switch. The output power of the DC power supply, or the combined output power of the DC power supply and the storage battery is switched by a switch, and provided to the DC / AC power conversion device. The output power of the DC power supply is thereby smoothed, and time shifting is possible.
[0099] The DC power source is typically a solar cell, but could also be a wind generator or a fuel cell. It may also be a device combining a solar cell and a wind power generator, a solar cell and a fuel cell, or a wind power generator and a fuel cell.
[0100] The first embodiment will be described with the DC power source being a solar cell. Therefore, the string...
no. 2 example
[0206] The power supply system according to the second embodiment of the present invention includes: a solar battery string, wherein the storage battery is connected in parallel with the solar battery; a DC / AC power conversion device, used for connecting the solar battery string to a power system or a load; a battery state detection unit for to detect the state of the battery; the output detection unit is used to detect the output power of the DC / AC power conversion device; and the output control unit is used to control the DC according to the state of the battery detected by the battery state detection unit and the output power detected by the output detection unit / AC power conversion equipment. With an inexpensive system, smoothing or time shifting of the output is possible because the state of the storage battery and the output power of the DC / AC power conversion device are judged for control. Because excessive current does not flow to the battery, the life of the battery ...
no. 3 example
[0298] The third embodiment of the present invention relates to a system that supplies power with high efficiency even at low output without requiring complicated control of DC / AC power conversion equipment.
[0299] A power supply system according to a third embodiment of the present invention has a plurality of power supply devices including a DC power supply string and a DC / AC conversion device connected in parallel to a power system or a load.
[0300] A DC power supply refers to obtaining DC power from a generator such as a solar cell, a wind generator, or a fuel cell. A DC / AC power conversion device is a so-called inverter that converts direct current into alternating current, and may be used in any method, such as a method using a high-frequency insulating transformer, and a method of performing PWM control and insulating using a commercial frequency transformer, in which The DC / AC conversion devices in each power string may be of the same type or may be different. The...
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Abstract
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