General Electric Company

Ge Energy Power Conversion Technology Gmbh

Wenqiang Yang

Anthony Michael Klodowski

Ralph Teichmann

Changyong Wang

Lei Li

Yunfeng Liu

Fei Xu

Xiaoming Yuan

Robert Allen Seymour

Haiqing Weng

Pengcheng Zhu

Zhigang Lu

Robert Gregory Wagoner

Yu Chen Zhou

Govardhan Ganireddy

Pengju Kang

Rajni Kant Burra

Zhuohui Tan

Rajendra Naik

Yingqi Zhang

Lishun Hu

Saijun Mao

Ling Luo

Hongwu She

Shivkumar Venkatraman Iyer

Ralph Tecihmann

A method for controlling an electrical power system connected to a power grid includes receiving a reactive power command and a measured reactive power and generating a reactive power error signal based on a difference between the reactive power command and the measured reactive power. Further, the method includes receiving, via a reactive power regulator, the reactive power error signal. Moreover, the method includes generating, via the reactive power regulator, a voltage command based on the error signal. The method also includes generating, via a droop control, a voltage droop signal. In addition, the method includes generating a voltage error signal as a function of the voltage droop signal and at least one of the voltage command or a measured terminal voltage. Thus, the method further includes generating, via a voltage regulator, a reactive current command based on the voltage error signal.

Systems and methods for controlling electrical power systems connected to a power grid

A direct current (DC) circuit breaker for power transmission or distribution system includes a current sensor for sensing current of a system, a controller, a physical switch, and multiple switch modules. The multiple switch modules are electrically coupled to the current sensor and the physical switch in series. Each switch module includes multiple base elements electrically coupled in parallel. Each base element includes a first silicon carbide (SiC) metal-oxide-semiconductor field-effect transistor (MOSFET) and a second SiC MOSFET electrically coupled in an opposite series connection mode. The first and second SiC MOSFETs are configured in a synchronous rectification mode by channel reverse conduction control. The controller controls the multiple switch modules to connect current in the system, and break current of the multiple switch modules according to sensed current signals from the current sensor.

Device and method to break the current in power transmission or distribution system

A drilling system, comprising: a plurality of drilling drive systems; a fracturing drive system; a centralized power supply system electrically coupled to said drilling drive systems and said fracturing drive system to supply power thereto; and a plurality of distributed power supply systems electrically coupled to said drilling drive systems to supply additional power thereto during peak loading of a respective one of the plurality of drilling drive systems.

Exploration drilling system and method for supplying power thereto

A circuit breaker comprising a superconducting fault current limiter and a circuit breaker module, wherein the superconducting fault current limiter and the circuit breaker module are connected in series. The circuit breaker module includes a disconnector, a first semiconductor switch unit, and a second semiconductor switch unit, wherein the disconnector is connected in series with the first semiconductor switch unit, and also connected in series with the superconducting fault current limiter, and the second semiconductor switch unit is connected in parallel with the disconnector and first semiconductor switch unit that are connected in series. The circuit breaker can quickly and securely interrupt a circuit when an overcurrent fault occurs on the circuit.

Circuit breaker

An exemplary power conversion system includes a first power conversion module, a second power conversion module, and a controller. The first power conversion module includes a first source side converter, a first load side converter, and a first DC link coupled between the first source side converter and the second load side converter. The second power conversion module includes a second source side converter, a second load side converter, and a second DC link coupled between the second source side converter and the second load side converter. The controller is configured to generate a number of switching signals according to a circuit structure of the power source module or a circuit structure of the load module. The switching signals are provided to the first power conversion module and the second power conversion module to balance a first DC link voltage and a second DC link voltage.

Power conversion system and method

A system for power conversion includes a power converter having switching elements, a detector, and a controller is provided. The detector detects a parameter and provides electrical signals indicative of the parameter. The controller receives the electrical signals transmitted from the detector, and sends commands to instruct the power converter to perform power conversion by operating the switching elements in accordance with switching signals at a different frequency in response to a detection of the system condition. A method for operating the system is also provided.

System and method for converter switching frequency control

A control system includes a fundamental control unit, first and second compensation control units, a switch control unit, and a switch implementation unit. The fundamental control unit generates fundamental commands to implement fundamental power conversion operation for a converter. The first compensation control unit generates a first compensation signal for injection into the fundamental command to balance neutral point voltage when the converter is in operation in a first state. The second compensation control unit generates a second compensation signal for injection into the fundamental command to balance neutral point voltage when the converter is in operation in a second state. The switch control unit detects first and second states of the converter and provides first and second switch signals respectively. The switch implementation unit switches the fundamental control unit to communicate with the first and second compensation control units according to the first and second switch signals respectively.

Neutral point clamped converter control system and control method and compensation unit

A control system includes first and second fundamental control units for generating first and second fundamental commands, and a compensation control unit. The compensation control unit includes first and second calculation elements and a comparator for comparing first and second modulation indexes. When the first modulation index is less than the second modulation index, the first calculation element generates a first source-side compensation command. When the first source-side compensation command is not sufficient to balance the neutral point voltage, the first calculation element further generates a first line-side compensating command. When the first modulation index is greater than the second modulation index, the second calculation element generates a second line-side compensation command. When the second line-side compensation command is not sufficient to balance the neutral point voltage, the second calculation element further generates a second source-side compensating command.

Neutral point clamped converter control systems and methods

A method of assembling an electrical machine includes programming at least one processor with a stator flux vector estimation scheme. The electrical machine has a stator at least partially extending around a rotor. The electrical machine is electrically coupled to an electric power system. The electric power system transmits at least one phase of electric power to and from the electrical machine with at least partial power conversion. The stator flux vector estimation scheme is programmed to generate at least one stator back-electromagnetic force (back-EMF) signal and to generate at least one stator flux vector signal using the at least one stator back-EMF signal. The at least one stator flux vector signal at least partially represents an estimated rotor position. The method also includes coupling at least one output device in data communication with the at least one processor.

Method and apparatus for assembling electrical machines

An apparatus for electric braking and system protection for an electric generator includes a dynamic brake and a crowbar circuit designed for cooperation with power converters to dump power upon command. The dynamic brake includes at least one resistor and the crowbar circuit includes another at least one resistor for dissipating power from the electric generator. Methods for use of the electric braking and system protection calls for shunting the power to at least one of the dynamic brake, the crowbar circuit and the generator side power converter.

Redundant electrical brake and protection system for electric generators

A wind turbine having features for black-starting includes an electric generation system for producing electricity by operation of the wind and comprising an interface for providing the electricity to an electric grid; a control system for controlling components of the wind turbine during start-up of the electric generation system, wherein start-up occurs during a deficient electric signal of the grid; and at least one energy providing element and at least one energy dissipative element for providing a balance between an output of the wind turbine and the electric signal of the grid. Methods and computer program products for operation of the wind turbine call for, among other things, synchronization of electric signals and control of components within the wind turbine.

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Shanghai, China

Wenqiang Yang