Vestas Wind Systems A/s

Nanyang Technological University

Sabic Global Technolgoies B.v.

Anshuman Tripathi

Amit Kumar Gupta

Shu Yu Cao

Lars Helle

Bing Xuan Li

Gil Lampong Opina, Jr

Yugarajan Karuppanan

Gert Karmisholt Andersen

Ove Styhm

Eng Kian Kenneth Sng

Ramasamy Anbarasu

Kim Brondum Larsen

Saurabh Gupta

Cao Shu Yu

Abishek Sethupandi

Allan Holm Jörgensen

Swee Yee Fonn

Brihadeeswara Sriram Vaisambhayana

Radhika Sarda

Rasool Beevi D-o Mohamed Arif

Madasamy Palvesha Thevar

Fengjiao Cui

Om Prakash

Søren Andersen

Weifu Yu

Liang Yang

Shuyu Cao

Ravi Kandasamy

Ashwit Dias

Victor Donescu

Daniel Sowle

Michael Casem Tumabcao

Hock Heng Thia

Howe Li Yeo

Kheng Hong Ang

Ji Qian

Nishanthi Duraisamy

Milind S Paradkar

Elvis Yu

Tze Yang Liaw

Zhi Yoong Ang

Glen Ghias Farivar

Haonan Tian

Sriram Vaisambhayana Brihadeeswara

Hossein Dehghani Tafti

Satyajit Athlekar

Bing Li

Rasool Beevi D-O Mohamed Arif

Gil Jr Lampong Opina

Yugarajan Kapuppanan

A system stores and distributes electric energy. The electric energy includes pulsed energy. The system includes one or more energy sources to store electric energy, one or more converters to distribute first electric energy among the energy sources and distribute second electric energy from the energy sources to one or more entities, interfaces coupled to the one or more energy sources and the one or more converters, and a controller system that performs operations. These operations include receiving a demand for the second electric energy from a particular entity, the demand indicating one or more electric characteristics of the second electric energy and one or more entity characteristics of the particular entity. The operations include, after receiving the demand, controlling the one or more converters to distribute the second electric energy from the one or more energy sources according to the one or more electric characteristics, the one or more entity characteristics, and one or more energy characteristics of the one or more energy sources.

Pulsed energy storage and distribution system

A decoupled system for controlling a solid state transformer (SST), the SST comprising an AC-to-DC stage, a DC-to-AC stage, and a DC-to-DC stage, the DC-to-DC stage comprising one or more DC-to-DC converters. The system comprises a stored energy controller coupled to the AC-to-DC stage, the energy controller configured to control the total amount of stored energy within the capacitors of the SST; a power flow controller coupled to the DC-to-AC stage, the power flow controller configured to control power flow in the SST; and one or more energy balancing controllers each coupled to a corresponding DC-to-DC converter, each energy balancing controller configured to balance energy in the corresponding DC-to-DC converter.

Solid state transformer controller

This invention relates to a method of controlling a Solid State Transformer (SST). The method comprises dividing a dual active bridge (DAB) power reference on a Low Voltage (LV) side Direct Current (DC) link voltage to obtain a total DAB reference current; dividing the total DAB current reference by N number of DAB modules to obtain a reference current for each DAB module; in response to SST being in a normal power regulation, determining a deviation of a capacitor voltage at the HV side of each of a k DAB modules with reference from an average voltage from the HV DC bus; determining a current adjustment signal for each of the k DAB modules based on the total DAB reference current and a corresponding deviation of the capacitor voltage of each of the k DAB modules; adding a saturated current adjustment signal together with the reference current for each of the k DAB modules to obtain a total current reference for each of the k DAB modules; and subtracting a sum of the total current reference of each of the k DAB modules from the total DAB reference current to determine a total current reference for an NDAB module.

Dual voltage and current loop linearization control and voltage balancing control for solid state transformer

There is provided a power converter system including a power bus, a plurality of power converter modules connected to the power bus in parallel, a plurality of energy storage modules, each energy storage module coupled to the power bus via a corresponding one of the plurality of power converter modules, and a controller module configured to control at least one of the power converter modules to operate in one of a plurality of operating modes. In particular, the plurality of operating modes of the power converter module includes a plurality of charging power conversion modes for connecting an input power source to the corresponding energy storage module for charging power to the corresponding energy storage module. There is also provided a corresponding method of manufacturing the power converter system.

Power converter system and method of manufacturing thereof

A method for diagnostic monitoring of a wind turbine generator system, said wind turbine generator system comprising a generator, a drive train, and a number of sensors for providing signals and a control system. The method comprising the selection of three sets of signals from said sensors. From the three sets of signals three conditioned sets of signals are obtained by high pass filtering said first set of signals, low pass filtering the second set of signals, and forming a moving average value on the third set of signals. Based on each of said first, second and third set of conditioned signals an evaluation is performed in order to determine a fault, where said evaluation comprises comparing the first, second and third set of conditioned signals with reference values. If said comparison indicates a fault an alarm is set.

Method for diagnostic monitoring of a wind turbine generator system

A method for controlling a variable speed wind turbine generator is disclosed. The generator is connected to a power converter comprising switches. The generator comprises a stator and a set of terminals connected to the stator and to the switches of the power converter. The method comprises: determining a stator flux reference value corresponding to a generator power of a desired magnitude, determining an estimated stator flux value corresponding to an actual generator power, determining a difference between the determined stator flux reference value and the estimated stator flux value, and operating said switches in correspondence to the determined stator flux reference value and the estimated stator flux value to adapt at least one stator electrical quantity to obtain said desired generator power magnitude.

Direct power and stator flux vector control of a generator for wind energy conversion system

A power dissipating arrangement for dissipating power from a generator in a wind turbine is provided. The generator comprises a plurality of output terminals corresponding to a multi-phase output. The power dissipating arrangement comprises a plurality of dissipating units, a plurality of semiconductor switches, a trigger circuit for switching the semiconductor switches and a control unit for controlling the operation of the trigger circuit, thereby controlling the switching of the semiconductor switches.

Power dissipating arrangement in a wind turbine

A variable speed wind turbine is provided. The wind turbine comprises a generator, a power converter for converting at least a portion of electrical power generated by the generator, an energy management arrangement coupled to the power converter, the energy management arrangement comprises an energy storage unit, and a controller. The controller is adapted to detect a power imbalance event and to transfer at least a portion of excess electrical energy generated by the generator to the energy storage unit to be stored therein when the power imbalance event is detected.

Variable speed wind turbine, and a method for operating the variable speed wind turbine during a power imbalance event

A method of controlling a wind turbine generator is provided, the wind turbine generator converting mechanical energy to electrical. The method comprises: determining an electromagnetic power reference representing the electromagnetic power generated by the wind turbine generator, wherein the electromagnetic power reference is determined based on a desired output of the wind turbine generator; controlling the electrical power generated by the wind turbine generator using a control signal, wherein the control signal is derived from the electromagnetic power reference and is modified in dependence on an inverse power function of the wind turbine generator by incorporating minimal copper loss constraint and stator voltage limiting constraint such that non-linearity of the wind turbine generator is compensated in the control loop and it operates at its maximum efficiency. One effect of the method is that classical linear control loop design can be employed in spite of the plant being a non-linear identity.

Method of controlling a wind turbine generator and apparatus for controlling electric power generated by a wind turbine generator

Parameters of PM machines, especially for IPM machine, are known to vary by significant amounts. This affects the controllability of such machines, which may lead to reduced power loading capability and increased losses. The present invention relates to a method for PM machine inductance profile identification based on voltage mode stator flux observation which could be easily integrated to the generator start-up process in wind turbine application for both stator flux vector feedback control system and current vector feedback control system.

Permanent magnet generator inductance profile identification

The present invention relates to a method for charging a DC link of a power converter included in a wind turbine generator, the wind turbine generator comprising a generator side converter connected to an electrical generator and a grid side converter connectable, or connected, to an electrical grid through a grid circuit breaker, and a converter controller arranged to control at least the DC link, the DC link having a DC voltage level, the wind turbine generator comprising a wind turbine rotor arranged to rotate the electrical generator, wherein the method comprises rotating the wind turbine rotor whereby the electrical generator generates electrical power, rectifying the electrical power through at least one diode of the generator side converter in order to pre-charge the DC link to a DC voltage level, closing the grid circuit breaker when the DC voltage level is greater than a threshold level. The invention also relates to a wind turbine generator with a converter controller for controlling pre-charging of a DC link.

Method for charging a DC link of a wind turbine power electronic converter

According to a method of the present invention, a method of operating a wind turbine comprising a power generator, a generator side converter connected to the power generator, a line side converter connected to a power grid through power components, and a DC-link connected between the generator side converter and the line side converter is provided, the method comprising: monitoring the grid voltages on the power grid for overvoltage events; if an overvoltage event is detected, operating the line side converter in an overmodulation range for at least a part of the duration of the overvoltage event.

Method of operating a wind turbine as well as a system suitable therefor

A power dissipating arrangement for dissipating power from a generator in a wind turbine is provided. The generator comprises a plurality of output terminals corresponding to a multi-phase output. The power dissipating arrangement comprises a plurality of dissipating units, a plurality of semiconductor switches, a trigger circuit for switching the semiconductor switches and a control unit for controlling the operation of the trigger circuit, thereby controlling the switching of the semiconductor switches. Each dissipating unit includes a first terminal and a second terminal. The first terminal of each dissipating unit is coupled to each output terminal of the generator. Each semiconductor switch includes a first terminal anode, a second terminal and a gate terminal. The first terminal of each semiconductor switch is coupled to the second terminal of each dissipating unit and the second terminal of the semiconductor switch is coupled to the second terminal of another dissipating unit, such that the second terminal of each dissipating unit is coupled to the first terminal of one semiconductor switch and the second terminal of another semiconductor switch. The trigger circuit is coupled to the gate terminal of the plurality of the semiconductor switches for switching the semiconductor switches.

A system for a wind turbine generator comprising: a set of voltage limiting elements, and a controller configured to bypass the voltage limiting elements when a line voltage is below a predetermined threshold, and configured to connect each voltage limiting element in series between a grid side converter and a turbine transformer of the wind turbine generator, and to determine a current control reference signal for controlling the grid side converter (to generate a determined current) when the line voltage is above the predetermined threshold.

Wind turbine generator

Various systems and methods for forming a polymer part with utilizing heating fluid are provided. In one embodiment of the present invention a method for forming polymer includes heating the mold apparatus with a first heat energy source comprising heating fluid to a first mold temperature, and then heating the mold apparatus with a second energy source which is different than the first energy source. The second energy source heats the mold surface to a second mold temperature greater than the first mold temperature to form the part to achieve a desired surface finish of the polymer part.

Method for forming a polymer part

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Singapore, Singapore

Anshuman Tripathi