POWER CONVERSION APPARATUS AND CONTROL METHOD

• Main Authors: CHEN, Aitang, ZHU, Dili
• Format: Patent
• Language: English; French; German
• Published: 28.08.2024
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

This application provides a power conversion apparatus and a control method. The apparatus includes a first direct current conversion module, a second direct current conversion module, and a control module. An input end of the first direct current conversion module is configured to connect to a first photovoltaic string. An input end of the second direct current conversion module is configured to connect to a second photovoltaic string. An output end of the first direct current conversion module and an output end of the second direct current conversion module are connected in parallel to a direct current bus. The control module is configured to: control, when an output voltage of the first photovoltaic string is greater than an output voltage of the second photovoltaic string and a comparison value between the two output voltages is greater than a first threshold, a switching transistor in the first direct current conversion module to be turned on or off to decrease the output voltage of the first photovoltaic string and a switching transistor in the second direct current conversion module to be turned on or off to increase the output voltage of the second photovoltaic string, so that a comparison value between the output voltage of the second photovoltaic string and a bus voltage of the direct current bus is less than a second threshold. This application can improve operating efficiency of the power conversion apparatus and increase a system energy yield.