Patent application number | Description | Published |
20090146500 | Power converters - The present invention provides a power converter that can be used to interface a generator ( | 06-11-2009 |
20110182093 | CURRENT CONTROLLER DEVICE AND VECTOR CONTROL METHOD FOR CONTROLLING POWER CONVERSION - A current controller device using a vector control algorithm for controlling conversion of DC power into AC power is provided. The controller device has an open loop control loop gain and produces a first and a second voltage demand signals based on a first and a second current demand signals, a first and a second current feedback signals, a first and a second voltage feedback signals. The open loop control loop gain depends on frequencies of the first and second current feedback signals. A first and a second filters are provided at a first and a second current feedback inputs respectively. The first and second filters each have a filter characteristics to reduce the frequencies of the first and second current feedback signals at which the open loop control loop gain is greater than unity and has a phase less than or equal to minus 180°. | 07-28-2011 |
20120206945 | Controller for a power converter and method of operating the same - There is provided a controller for a converter and a respective method of operating such a controller. The converter receives an input power and provides an output power by a switching operation wherein in an embodiment the output power has at least two phases. The controller includes an input for receiving a feedback signal depending on the output power of the converter, and an output for providing a control signal to the converter to thereby control the switching operation of the converter. The control signal corresponds to a switching pattern that is updated in response to the feedback signal. The control signal includes a harmonic compensation signal which reduces higher harmonics in the output power, the higher harmonics originating from a time delay between taking the feedback signal and the updating of the switching pattern. | 08-16-2012 |
20120299305 | Method and System for Operating and Controlling a Wind Turbine to Prevent Excitation of Subsynchronous Oscillations within the Wind Turbine - A full converter connected to a series compensated transmission line. The full converter comprises a generator side converter, a DC link connected across an output of the generator side converter, a line side converter connected across an output of the DC link, and a converter controller configured to control the full converter to mitigate effects of subsynchronous oscillations present on the series compensated transmission line. | 11-29-2012 |
20140152292 | DECOMPOSITION AND MITIGATION OF A DISTURBANCE BEING PRESENT AT AN ELECTRIC CONNECTION BETWEEN AN ELECTRIC POWER GENERATING SYSTEM AND A POWER GRID - A disturbance on an electric signal at an electric connection between an electric power generating system and a power grid is decomposed into a first disturbance with a first strength assigned to the electric power generating system and a second disturbance with a second strength assigned to the power grid. A voltage value of a voltage of the electric signal is measured. A current value of a current of the electric signal is measured. A value of an open circuit voltage of an equivalent voltage source is calculated based on the measured voltage value, the measured current value and a characteristic equivalent impedance of the electric power generating system so that the electric power generating system is in a harmonic model. The strength of the first disturbance is determined based on the calculated value of the open circuit voltage of the equivalent voltage source. | 06-05-2014 |
20140307488 | CONTROLLER FOR CONTROLLING A POWER CONVERTER - A controller is provided for controlling a power converter that converts electrical input power of a wind turbine into electrical output power provided to a grid. The power converter includes grid-side and turbine-side converter parts. The controller comprises an input terminal for receiving a voltage reference signal associated with a predefined grid voltage and a frequency reference signal associated with a predefined grid frequency, and a network bridge controller adapted to control power conversion of the grid-side converter part. The network bridge controller includes a modulator for modulating gate drive command signals in the grid-side converter part based on a reference voltage and a reference angle derived from the voltage reference signal and the frequency reference signal. The modulator is adapted to modulate the gate drive command signals to maintain the predefined grid voltage and the predefined grid frequency in the power converter in case of failure within the grid. | 10-16-2014 |
20150263569 | POWER SUPPLY ARRANGEMENT OF A WIND FARM - A power supply arrangement adapted to provide auxiliary power to a wind farm that feeds into a HVDC transmission link is provided. The power supply arrangement has an auxiliary power supply to deliver auxiliary power (P | 09-17-2015 |