Solar photovoltaic power generation system, vehicle, solar photovoltaic power generation system control method, and computer readable recording medium having recorded therein program for causing compu

Abstract

A charge control ECU (40) stops a charge converter (20) periodically or at a predetermined timing, and detects the open-circuit voltage of a solar cell (30) through a voltage sensor (50). The charge control ECU (40) uses a preset relational expression or map to determine the operating voltage corresponding to a maximum output power from the solar cell (30) based on the detected open-circuit voltage. The charge control ECU (40) causes the charge converter (20) to resume its operation when the determined operating voltage is set at the charge converter (20) as the target voltage (VR).

Description

technical field [0001] The present invention relates to a photovoltaic power generation system using solar cells as a power source and a vehicle equipped with solar cells as a power source. Background technique [0002] Japanese Patent Application Laid-Open No. 2003-84844 discloses a method for controlling the maximum power of a solar cell. In this control method, the target operating voltage of the solar cell is changed according to the command value of the output current of the power conversion device, and the difference between the output power at the previous target operating voltage and the output power at the current target operating voltage is obtained, so that The target operating voltage substantially coincides with the maximum output operating voltage at which the difference becomes the smallest. Here, when the current command value is controlled to change the target operating voltage, the difference between the target operating voltage and the output power at the...

AI Technical Summary

Problems solved by technology

[0004] However, in the maximum power control method disclosed in Japanese Unexamined Patent Application Publication No. 2003-84844, the output power of the solar cell is calculated, and feedback control is performed based on the calculated output power. Therefore, there is a problem of controlling a sudden change in the amount of sunlight. Following the delay, the maximum power control will become unstable, which may reduce the power generation efficiency

In particular, when a solar cell is mounted on a vehicle as a power source for a vehicle, the amount of sunlight changes more drastically than when the solar cell is installed at a fixed point as a power source for a house, so the above-mentioned problem becomes apparent.

[0005] In addition, in the above-mentioned maximum power control method, a current detector for power calculation is required, and a high-speed calculation processing device for realizing feedback control is also required, so the cost of the system increases.

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