Power supply system
First Claim
1. A power supply system comprising:
- a DC power supply string in which a storage battery module is connected in parallel to a DC power supply;
a DC/AC power conversion device for connecting the DC power supply string to a power system or a load; and
a switch, connected between the DC power supply and the storage battery module, for switching an output power of the DC power supply when the switch is ON or OFF or a combined output power of the DC power supply and the storage battery module when the switch is ON and supplying to the DC/AC power conversion device,wherein the DC power supply is a solar battery module, and the DC power supply string is a solar battery string,wherein the DC power supply string includes a time monitoring unit, a voltage detecting unit, or a current detecting unit,wherein the switch is switched when one of the time monitoring unit, the voltage detecting unit, or the current detecting unit satisfies a predetermined condition, andwherein the predetermined condition isi) start output (switch ON) when a detected voltage of the voltage detecting unit or a detected current of the current detecting unit becomes greater than or equal to a predetermined value, or stop output (switch OFF) when becoming smaller than or equal to the predetermined value,ii) start output (switch ON) or stop output (switch OFF) in accordance with a predetermined time of the time monitoring unit,iii) start output (switch ON) or stop output (switch OFF) when the detected voltage of the voltage detecting unit or the detected current of the current detecting unit becomes greater than or equal to the predetermined value and in accordance with the predetermined time of the time monitoring unit, andiv) start output (switch ON) or stop output (switch OFF) when the detected voltage of the voltage detecting unit or the detected current of the current detecting unit becomes smaller than or equal to the predetermined value and in accordance with the predetermined time of the time monitoring unit.
1 Assignment
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Accused Products
Abstract
A power supply system capable of smoothing photovoltaic generation output, and enabling time shift is provided. A power supply system including a DC power supply string in which a storage battery is connected in parallel to a DC power supply; and a DC/AC power conversion device for connecting the DC power supply string to a power system or a load is provided. A switch is connected between the DC power supply and the storage battery, where an output power of the DC power supply or a combined output power of the DC power supply and the storage battery is switched and supplied to the DC/AC power conversion device by the switch. The photovoltaic generation output is thereby smoothed, and time shift is enabled.
34 Citations
34 Claims
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1. A power supply system comprising:
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a DC power supply string in which a storage battery module is connected in parallel to a DC power supply; a DC/AC power conversion device for connecting the DC power supply string to a power system or a load; and a switch, connected between the DC power supply and the storage battery module, for switching an output power of the DC power supply when the switch is ON or OFF or a combined output power of the DC power supply and the storage battery module when the switch is ON and supplying to the DC/AC power conversion device, wherein the DC power supply is a solar battery module, and the DC power supply string is a solar battery string, wherein the DC power supply string includes a time monitoring unit, a voltage detecting unit, or a current detecting unit, wherein the switch is switched when one of the time monitoring unit, the voltage detecting unit, or the current detecting unit satisfies a predetermined condition, and wherein the predetermined condition is i) start output (switch ON) when a detected voltage of the voltage detecting unit or a detected current of the current detecting unit becomes greater than or equal to a predetermined value, or stop output (switch OFF) when becoming smaller than or equal to the predetermined value, ii) start output (switch ON) or stop output (switch OFF) in accordance with a predetermined time of the time monitoring unit, iii) start output (switch ON) or stop output (switch OFF) when the detected voltage of the voltage detecting unit or the detected current of the current detecting unit becomes greater than or equal to the predetermined value and in accordance with the predetermined time of the time monitoring unit, and iv) start output (switch ON) or stop output (switch OFF) when the detected voltage of the voltage detecting unit or the detected current of the current detecting unit becomes smaller than or equal to the predetermined value and in accordance with the predetermined time of the time monitoring unit. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A power supply system comprising:
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a solar battery string in which a storage battery is connected in parallel to a solar battery; a DC/AC power conversion device for connecting the solar battery string to a power system or a load; a battery state detecting unit for detecting a state of the storage battery; an output detecting unit for detecting an output power of the DC/AC power conversion device; and an output control unit for controlling the DC/AC power conversion device based on the state of the storage battery detected by the battery state detecting unit and the output power detected by the output detecting unit, wherein the storage battery includes a plurality of storage battery modules with a corresponding plurality of electromotive forces, and wherein the output control unit controls the DC/AC power conversion device such that power is drawn from a storage battery module whose electromotive force will not cause an overcurrent flow from any other storage battery module. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A power supply system, comprising:
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a plurality of DC power supply strings in which a storage battery module is connected in parallel to a DC power supply in each DC power supply string; a DC/AC power conversion device arranged to connect the plurality of DC power supply strings to a power system or a load; and a storage battery control unit arranged to control the DC/AC power conversion device to substantially equalize voltages of the storage battery modules by controlling the DC/AC power conversion device to make a power request from the plurality of DC power supply strings. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A control method of a power supply system, the power supply system including a plurality of DC power supply strings in which a storage battery module is connected in parallel to a DC power supply in each DC power supply string, and a DC/AC power conversion device for connecting the plurality of DC power supply strings to a power system or a load, the method comprising the steps of:
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controlling the DC/AC power conversion device to substantially equalize voltages of the storage battery modules; and outputting power from the DC/AC power conversion device, wherein the step of controlling the DC/AC power conversion device to substantially equalize voltages of the storage battery modules comprises controlling the DC/AC power conversion device to make a power request from the plurality of DC power supply strings. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34)
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Specification