Abstract: An energy storage system includes a controller and a plurality of battery packs connected in parallel. The battery pack includes a cell pack, a temperature sensing module, a temperature control module, and a battery management system (BMS). The temperature sensing module is configured to detect a temperature of the battery pack, the temperature control module is configured to heat the battery pack, and the BMS is configured to send heating requests and states of charge (SOCs) of corresponding battery packs to the controller. The controller determines, based on a difference between a voltage of a direct-current bus and a charging voltage reference value of the energy storage system, a quantity of battery packs whose temperature control modules can be enabled, and determines, based on the SOCs of the battery packs, priorities for enabling the temperature control modules of the battery packs, enhancing utilization of power generation power.

Abstract: A power conversion apparatus including a first direct current conversion module, a second direct current conversion module, and a control module. The control module is configured to: in response to an output voltage of the first photovoltaic string being greater than an output voltage of the second photovoltaic string and a comparison value between the two output voltages being greater than a first threshold: control 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 control 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.

Abstract: An energy storage system includes a controller and a plurality of battery packs connected in parallel. The battery pack includes a cell pack, a temperature sensing module, a temperature control module, and a battery management system (BMS). The temperature sensing module is configured to detect a temperature of the battery pack, the temperature control module is configured to heat the battery pack, and the BMS is configured to send heating requests and states of charge (SOCs) of corresponding battery packs to the controller. The controller determines, based on a difference between a voltage of a direct-current bus and a charging voltage reference value of the energy storage system, a quantity of battery packs whose temperature control modules can be enabled, and determines, based on the SOCs of the battery packs, priorities for enabling the temperature control modules of the battery packs, enhancing utilization of power generation power.

Abstract: This application provides a photovoltaic energy storage control module and a photovoltaic energy storage control method. A control component included in the photovoltaic energy storage control module can set reference values of bus voltages of a first direct-current converter, a second direct-current converter, and an inverter. Further, the first direct-current converter, the second direct-current converter, and the inverter can automatically adjust a power supply relationship among the first direct-current converter, the second direct-current converter, and the inverter based on a value relationship among the reference values of the bus voltages of the first direct-current converter, the second direct-current converter, and the inverter. In this way, flexibility of the photovoltaic energy storage control module is improved.