Patents by Inventor Lexuan Meng

Lexuan Meng has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 12348029
    Abstract: There is disclosed herein an energy storage system comprising an energy storage circuit, comprising a string of interconnected energy storage units configured to store electrical energy and provide power to a power grid using said stored electrical energy. The ESS further comprises an auxiliary module configured to provide auxiliary functions for at least one of the plurality of energy storage units, and an auxiliary power supply circuit for providing power to the auxiliary module from a grounded power source. The auxiliary power supply circuit is configured to galvanically isolate the energy storage circuit from the grounded power source, thereby preventing electrical arcing between the ESS, which may be at a high voltage, and ground at the grounded power source.
    Type: Grant
    Filed: June 2, 2022
    Date of Patent: July 1, 2025
    Assignee: Hitachi Energy Ltd
    Inventors: Mohsen Asoodar, Lexuan Meng, Tong Wu, Jean-Philippe Hasler, Gunnar Ingeström
  • Publication number: 20250175030
    Abstract: There is disclosed herein an energy storage system comprising an energy storage circuit, comprising a string of interconnected energy storage units configured to store electrical energy and provide power to a power grid using said stored electrical energy. The ESS further comprises an auxiliary module configured to provide auxiliary functions for at least one of the plurality of energy storage units, and an auxiliary power supply circuit for providing power to the auxiliary module from a grounded power source. The auxiliary power supply circuit is configured to galvanically isolate the energy storage circuit from the grounded power source, thereby preventing electrical arcing between the ESS, which may be at a high voltage, and ground at the grounded power source.
    Type: Application
    Filed: June 2, 2022
    Publication date: May 29, 2025
    Inventors: Mohsen ASOODAR, Lexuan MENG, Tong WU, Jean-Philippe HASLER, Gunnar INGESTRÖM
  • Publication number: 20250141244
    Abstract: There is disclosed herein a method for fault-response in an energy storage system (ESS), wherein the ESS comprises a string of series-connected energy storage cabinets (110), and the string of energy storage cabinets comprises at least two energy storage cabinets (110A, 110B) and a discharge resistor (150) arranged such that the discharge resistor is selectively connectable to each or both of the two cabinets (110A, 110B). The method comprises detecting a failure of a first cabinet (110A) of the two cabinets (110A, 110B) and, in response to detecting the failure of the first cabinet (110A), selectively electrically connecting the discharge resistor (150) to the first cabinet (110A), thereby discharging electrical energy stored in the first cabinet (110A) via the discharge resistor (150).
    Type: Application
    Filed: February 18, 2022
    Publication date: May 1, 2025
    Inventors: Anton SÖDERBLOM, Haofeng BAI, Philippe NOISETTE, Lexuan MENG, Gunnar INGESTRÖM
  • Patent number: 12249856
    Abstract: A module (100) for use in an energy storage system is provided, including a first terminal (110) and a second terminal (112); a supercapacitor branch (120) including an arrangement (122) of one or more supercapacitors (124), and a resistive bypass branch (130) including at least a first bypass switch (132) and a resistance (134) connected in series. The supercapacitor branch and the resistive bypass branch are connected in parallel between the first terminal and the second terminal. The module may further include a direct bypass branch (140) having a second bypass switch (142), the direct bypass branch being also connected in parallel with the supercapacitor branch (120) between the first and second terminals. A control method of such a module and an energy storage system including several such modules, are also provided.
    Type: Grant
    Filed: May 31, 2021
    Date of Patent: March 11, 2025
    Assignee: HITACHI ENERGY LTD
    Inventors: Jean-Philippe Hasler, Juergen Steinke, Gunnar Ingeström, Jan Svensson, Lexuan Meng, Haofeng Bai, Tong Wu, Theodore Soong
  • Patent number: 12212165
    Abstract: An arrangement is disclosed, comprising a series connection of a plurality of energy storage units, a plurality of bypass circuits, each bypass circuit being configured to bypass a respective one of the energy storage units in the series connection, and a plurality of control modules, wherein each control module corresponds to a respective one of the bypass circuits. Each control module is configured to control operation of the corresponding bypass circuit and at least one other bypass circuit of the plurality of bypass circuits to selectively bypass the corresponding energy storage units in the series connection in such a way that operation of each bypass circuit of the plurality of bypass circuits to selectively bypass the corresponding energy storage unit in the series connection is controllable by means of at least two of the control modules. A related method is also disclosed.
    Type: Grant
    Filed: October 13, 2021
    Date of Patent: January 28, 2025
    Assignee: Hitachi Energy Ltd
    Inventors: Per Karreby, Jean-Philippe Hasler, Mikael Tenerz, Mohsen Asoodar, Lexuan Meng
  • Publication number: 20240339844
    Abstract: An arrangement is disclosed, comprising a series connection of a plurality of energy storage units, a plurality of bypass circuits, each bypass circuit being configured to bypass a respective one of the energy storage units in the series connection, and a plurality of control modules, wherein each control module corresponds to a respective one of the bypass circuits. Each control module is configured to control operation of the corresponding bypass circuit and at least one other bypass circuit of the plurality of bypass circuits to selectively bypass the corresponding energy storage units in the series connection in such a way that operation of each bypass circuit of the plurality of bypass circuits to selectively bypass the corresponding energy storage unit in the series connection is controllable by means of at least two of the control modules. A related method is also disclosed.
    Type: Application
    Filed: October 13, 2021
    Publication date: October 10, 2024
    Inventors: Per KARREBY, Jean-Philippe HASLER, Mikael TENERZ, Mohsen ASOODAR, Lexuan MENG
  • Publication number: 20240266847
    Abstract: A module (100) for use in an energy storage system is provided, including a first terminal (110) and a second terminal (112); a supercapacitor branch (120) including an arrangement (122) of one or more supercapacitors (124), and a resistive bypass branch (130) including at least a first bypass switch (132) and a resistance (134) connected in series. The supercapacitor branch and the resistive bypass branch are connected in parallel between the first terminal and the second terminal. The module may further include a direct bypass branch (140) having a second bypass switch (142), the direct bypass branch being also connected in parallel with the supercapacitor branch (120) between the first and second terminals. A control method of such a module and an energy storage system including several such modules, are also provided.
    Type: Application
    Filed: May 31, 2021
    Publication date: August 8, 2024
    Inventors: Jean-Philippe HASLER, Juergen STEINKE, Gunnar INGESTRÖM, Jan SVENSSON, Lexuan MENG, Haofeng BAI, Tong WU, Theodore SOONG
  • Publication number: 20240243587
    Abstract: A system is disclosed, comprising a plurality of energy storage units and at least one voltage balancing unit. Each voltage balancing unit is associated with at least one of the energy storage units. The at least one voltage balancing unit is connected to the energy storage units and when activated is configured to, on a condition that the voltage of at least one of the energy storage units associated with the at least one voltage balancing unit exceeds a threshold voltage level, reduce the voltage of at least the one(s) of the energy storage units whose voltage exceeds the threshold voltage level so as to become equal to or smaller than the threshold voltage level.
    Type: Application
    Filed: May 25, 2021
    Publication date: July 18, 2024
    Inventors: Lexuan MENG, Mohsen ASOODAR, Tong WU, Mikael TENERZ, Hongyang ZHANG
  • Patent number: 11996693
    Abstract: A support system for an AC power transmission system, comprising an energy storage arrangement comprising a plurality of storage units and a main controller configured to control the operation of the energy storage arrangement. Each storage unit comprises at least three control signal connections and is configured to receive a control signal from at least three storage entities via said control signal connections, wherein each of the storage entities is either the main controller or a storage unit controller of an adjacent storage unit. The storage units are arranged to forward a control signal received via a first one of said control signal connections to all adjacent storage units that are connected via the remaining ones of said control signal connections.
    Type: Grant
    Filed: April 14, 2021
    Date of Patent: May 28, 2024
    Assignee: HITACHI ENERGY LTD
    Inventors: Per Karreby, Daniel Hallmans, Lexuan Meng, Maria Werlefors
  • Patent number: 11996696
    Abstract: A power supporting arrangement for a power grid includes a first and a second voltage source converter with an AC side and a DC side. A DC link interconnects the DC sides of the voltage source converters. A first switching arrangement includes a number of settable positions. The AC side of the second voltage source converter is connected to the power grid and the first switching arrangement is connected between a first synchronous machine. The AC side of the first voltage source converter and the power grid and operable to selectively connect the first synchronous machine to the power grid or to the AC side of the first voltage source converter.
    Type: Grant
    Filed: April 2, 2020
    Date of Patent: May 28, 2024
    Assignee: HITACHI ENERGY, LTD
    Inventors: Lexuan Meng, Jean-Philippe Hasler, Gunnar Ingeström, Jan Kheir, Tong Wu, Theodore Soong
  • Publication number: 20240088662
    Abstract: A support system for an AC power transmission system, comprising an energy storage arrangement comprising a plurality of storage units and a main controller configured to control the operation of the energy storage arrangement. Each storage unit comprises at least three control signal connections and is configured to receive a control signal from at least three storage entities via said control signal connections, wherein each of the storage entities is either the main controller or a storage unit controller of an adjacent storage unit. The storage units are arranged to forward a control signal received via a first one of said control signal connections to all adjacent storage units that are connected via the remaining ones of said control signal connections.
    Type: Application
    Filed: April 14, 2021
    Publication date: March 14, 2024
    Inventors: Per KARREBY, Daniel HALLMANS, Lexuan MENG, Maria WERLEFORS
  • Publication number: 20240006885
    Abstract: An energy storage system and a method for controlling such a system is disclosed. The energy storage system comprises a plurality of interconnected energy storage cells forming an energy storage module, a power converter connected to the energy storage module, a resistor circuit connected in parallel to the energy storage module, a switch connected in series with the resistor circuit and configured to disconnect the resistor circuit from the energy storage module, and a control unit operably connected to the switch. The control unit is configured to receive information pertaining to a transmission of energy in the energy storage system and to control the switch based on said information.
    Type: Application
    Filed: November 11, 2020
    Publication date: January 4, 2024
    Inventors: Lexuan MENG, Haofeng BAI, Tong WU, Mohsen ASOODAR, Jean-Philippe HASLER, Gunnar INGESTRÖM, Jan KHEIR, Jan SVENSSON
  • Publication number: 20230223756
    Abstract: A power supporting arrangement includes a DC network having a first DC line with a first DC potential, a second DC line with a second DC potential, and an energy storage system that includes a first energy storage unit connected in a branch between the first and the second DC lines. A first group of phase arms is connected in a wye-configuration between the power grid and the first DC line and a second group of phase arms connected in a wye-configuration between the power grid and the second DC line. The first and second groups of phase arms are controllable as a voltage source converter. A third group of phase arms is connected to the power grid in a wye-configuration. The third group of phase arms have a neutral point and being controllable to support the power grid with reactive power.
    Type: Application
    Filed: May 25, 2020
    Publication date: July 13, 2023
    Inventors: Theodore Soong, Lexuan Meng, Jan Kheir, Tong Wu, Jean-Philippe Hasler, Gunnar Ingestrom, Yuhei Okazaki, Kalle Ilves, Alexandre Christe
  • Publication number: 20230119359
    Abstract: A power supporting arrangement for a power grid includes a first and a second voltage source converter with an AC side and a DC side. A DC link interconnects the DC sides of the voltage source converters. A first switching arrangement includes a number of settable positions. The AC side of the second voltage source converter is connected to the power grid and the first switching arrangement is connected between a first synchronous machine. The AC side of the first voltage source converter and the power grid and operable to selectively connect the first synchronous machine to the power grid or to the AC side of the first voltage source converter.
    Type: Application
    Filed: April 2, 2020
    Publication date: April 20, 2023
    Inventors: Lexuan Meng, Jean-Philippe Hasler, Gunnar Ingeström, Jan Kheir, Tong Wu, Theodore Soong