Patent ID: 11909217
Assignee: HUAWEI TECHNOLOGIES CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 20:
21. The energy storage system according to claim 19, wherein when an output voltage frequency of any one of the N DC/DC power conversion devices or the Y photovoltaic inverters is greater than a first preset voltage frequency threshold, each of the Y photovoltaic inverters performs output with reduced power based on a preset power curve of the photovoltaic inverter, and the N DC/DC power conversion devices charge the M cell strings; and
when an output end voltage frequency of any one of the N DC/DC power conversion devices or the Y photovoltaic inverters is less than a second preset voltage frequency threshold, each of the Y photovoltaic inverters performs output with increased power based on a preset power curve of the photovoltaic inverter, and the N DC/DC power conversion devices control the M cell strings to discharge, wherein the first preset voltage frequency threshold is greater than a preset power grid voltage normal frequency value, and the second preset voltage frequency threshold is less than the preset power grid voltage normal frequency value.