| 主权项 |
1. A photovoltaic module comprising:
a solar cell module including a plurality of solar cells; a junction box including a plurality of bypass diodes, a capacitor unit to store DC power supplied from the solar cell module, and a dc/dc converter unit to level-convert the stored DC power and output the level-converted DC power; and a controller to control a voltage or current based on the supplied DC power from the solar cell module among a plurality of sections where each section is a voltage range or a current range, calculate a local maximum power point in each of the sections using the controlled voltage or controlled current, determine a maximum power value among a plurality of calculated local maximum power points, and to control the dc/dc converter unit to output the level-converted DC power based on the determined maximum power value when a hot spot occurs in the solar cell module, wherein the junction box further includes:
a current detection unit to detect current supplied to the capacitor unit; anda voltage detection unit to detect the voltage at both ends of the capacitor unit, wherein when the hot spot occurs in the solar cell module, during a first section among the plurality of sections, the controller controls to vary the voltage at both ends of the capacitor unit based on the detected voltage from the voltage detection unit, performs power calculation based on the detected current and the detected voltage while varying the voltage at both ends of the capacitor unit, continuously compares calculated power value with the existing stored power value, stores a greater of the power values, and calculate a finally stored power value as a first local maximum power value after termination of exploring the first section, and wherein the first section corresponds to a section not related to the hot spot, wherein during a second section among the plurality of sections, the controller controls to vary the voltage at both ends of the capacitor unit based on the detected voltage from the voltage detection unit, performs power calculation based on the detected current and the detected voltage while varying the voltage at both ends of the capacitor unit, continuously compares calculated power value with the existing stored power value, stores a greater of the power values, and calculate a finally stored power value as a second local maximum power value after termination of exploring the second section, and wherein the second section corresponds to a section related to the hot spot, and wherein the controller determines the maximum power value among the plurality of calculated local maximum power points including the first local maximum power value and the second local maximum power value. |
