Abstract: A hierarchical voltage control system is provided. A supercapacitor unit and a lithium battery unit are both connected to a DC bus to form a parallel-structure-type hybrid energy storage system, and are each configured with a power device and a switch to control a connection relationship between the corresponding unit and the DC bus. A detection circuit detects current and voltage values of the supercapacitor unit, the lithium battery unit, and the DC bus, detects an operating parameter of a power conversion system, and transmits the operating parameter to a processor, the power conversion system being connected in parallel to the DC bus for bidirectional power conversion of AC and DC energy sources. A microprocessor determines a system operating condition and uses a hierarchical voltage control strategy to control charging and discharging states of the supercapacitor unit and the lithium battery unit.

Abstract: A hierarchical voltage control system is provided. A supercapacitor unit and a lithium battery unit are both connected to a DC bus to form a parallel-structure-type hybrid energy storage system, and are each configured with a power device and a switch to control a connection relationship between the corresponding unit and the DC bus. A detection circuit detects current and voltage values of the supercapacitor unit, the lithium battery unit, and the DC bus, detects an operating parameter of a power conversion system, and transmits the operating parameter to a processor, the power conversion system being connected in parallel to the DC bus for bidirectional power conversion of AC and DC energy sources. A microprocessor determines a system operating condition and uses a hierarchical voltage control strategy to control charging and discharging states of the supercapacitor unit and the lithium battery unit.

Abstract: The present invention discloses a method and a client for producing a small window at the client in a broadband data intelligent service, comprising: pre-setting a first module and a second module; while a user needs to use data service, obtaining, by the first module, the IP address of the client, and sending the IP address and authentication information input by the client to the portal server; upon receiving a past authentication message from the portal server, the first module making the second module to operate; and generating, by the second module, a small window to display the access information of the client and provide the user with operation buttons. Moreover, the present invention also discloses a method a device and a system for generating a user interface for a client terminal in a communication network.

Abstract: The present invention discloses a method and a client for producing a small window at the client in a broadband data intelligent service, comprising: pre-setting a first module and a second module; while a user needs to use data service, obtaining, by the first module, the IP address of the client, and sending the IP address and authentication information input by the client to the portal server; upon receiving a past authentication message from the portal server, the first module making the second module to operate; and generating, by the second module, a small window to display the access information of the client and provide the user with operation buttons. Moreover, the present invention also discloses a method a device and a system for generating a user interface for a client terminal in a communication network.