String inverter control method, apparatus, and system, and storage medium

A string inverter control apparatus, comprising:

• a first control module, configured to:
• in a process of performing current-voltage (IV) curve scanning on one or more first direct current/direct current (DC/DC) step-up circuits, control output power of an inverter circuit to be reference power, wherein a string inverter comprises the one or more first DC/DC step-up circuits, one or more second DC/DC step-up circuits, and the inverter circuit, the one or more first DC/DC step-up circuits are DC/DC step-up circuits on which current-voltage IV curve scanning is performed, the one or more second DC/DC step-up circuits are DC/DC step-up circuits on which the IV curve scanning is not performed;
• and
• a second control module, configured to:
• in the process of performing the IV curve scanning on the one or more first DC/DC step-up circuits, control a change of an output voltage of the one or more second DC/DC step-up circuits, wherein a change trend of the output voltage of the one or more second DC/DC step-up circuits and a change trend of an input voltage of the one or more first DC/DC step-up circuits in the IV curve scanning process present a non-strictly monotonically increasing relationship.

A string inverter control system, comprising:

• a string inverter comprising one or more first direct current/direct current (DC/DC) step-up circuits, one or more second DC/DC step-up circuits, and an inverter circuit, the one or more first DC/DC step-up circuits are DC/DC step-up circuits on which current-voltage (IV) curve scanning is performed, the one or more second DC/DC step-up circuits are DC/DC step-up circuits on which the IV curve scanning is not performed;
• and
• a controller connected to each of DC/DC step-up circuits comprised in the string inverter, wherein the controller is configured to
• in a process of performing the IV curve scanning on the one or more first DC/DC step-up circuits, control output power of the inverter circuit to be reference power, and
• control a change of an output voltage of the one or more second DC/DC step-up circuits, wherein a change trend of the output voltage of the one or more second DC/DC step-up circuits and a change trend of an input voltage of the one or more first DC/DC step-up circuits in the IV curve scanning process present a non-strictly monotonically increasing relationship.