Solar power generation system

Abstract

To provide a photovoltaic power generation system that includes storage batteries and can efficiently charge the storage batteries and discharge the storage batteries.SOLUTION: A photovoltaic power generation system 1 includes a calculation unit 15 capable of calculating a switching index value, representing a difference between photovoltaic power generation power generated and total power consumed. When the switching index value is equal to or greater than a threshold value A, the photovoltaic power generation system 1 is controlled to start a recharging mode of a storage battery 13. When the switching index value is less than a threshold value B, which is a value lower than the threshold value A, the photovoltaic power generation system 1 is controlled to start a discharging mode of the storage battery. Or, when the switching index value is less than the threshold value A, the photovoltaic power generation system 1 is controlled to start a recharging mode of the storage battery. And when the switching index value is equal to or greater than the threshold B, which is higher than the threshold A, the photovoltaic power generation system 1 is controlled to start a discharging mode of the storage battery. Thereby, the amount of commercial power used can be suppressed.SELECTED DRAWING: Figure 1

Claims

1. A solar power generation system comprising a load that consumes electricity, a commercial power source capable of supplying commercial power to the load, a solar cell capable of supplying generated solar power to the load and a storage battery, and a storage battery capable of supplying the charged power to the load, It is equipped with a calculation unit capable of calculating a switching index value, which is the value obtained by dividing the generated solar power by the total power consumption. A solar power generation system that controls the system to start the battery charging mode when the switching indicator value is equal to or greater than threshold A, and to start the battery discharging mode when the switching indicator value is less than threshold B, which is lower than threshold A. (However, total power consumption is calculated as "load power consumption - battery discharge power" or "load power consumption + battery charging power.")

2. A solar power generation system comprising a load that consumes electricity, a commercial power source capable of supplying commercial power to the load, a solar cell capable of supplying generated solar power to the load and a storage battery, and a storage battery capable of supplying the charged power to the load, It is equipped with a calculation unit capable of calculating a switching index value, which is the total power consumption divided by the amount of solar power generated. A solar power generation system that controls the system to start the battery charging mode when the switching indicator value is less than threshold A, and to start the battery discharging mode when the switching indicator value is greater than or equal to threshold B, which is higher than threshold A. (However, total power consumption is calculated as "load power consumption - battery discharge power" or "load power consumption + battery charging power.")

3. The control unit for solar power generation can set a correction value used to suppress the output of solar power to the load. The calculation unit can determine the amount of power to be sent from the solar panel to the load at regular intervals, based on the status of solar power generation and load power consumption at regular intervals, and a set correction value, so that the amount of power sent from the solar panel to the load does not exceed the load's power consumption. The solar power generation system according to claim 1 or 2, wherein the amount of charge and discharge is determined based on the result of a calculation performed by the calculation unit on "load power consumption - (solar power generation power / correction value)".

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