The present invention relates to an operation control method for a gasification power generation system for gasifying carbon-based fuel such as coal in a gasifier using oxygen or oxygen-enriched air as an oxidizing agent, burning the obtained syngas as fuel in a gas turbine, driving the gas turbine by the syngas, driving a steam turbine by steam generated using exhaust heat of the gas turbine, thus executing combined power generation.

In one aspect, a method for controlling a wind turbine based on an identified surface condition of a rotor blade may include monitoring an operating parameter of the wind turbine to obtain parameter data related to the operating parameter as an operating input of the wind turbine changes, analyzing the parameter data to identify a roughness state of the rotor blade and performing a corrective action in response to the identified roughness state.

This application provides a control method and device for avoiding run-away, and a wind turbine. The method may include: determining whether a brake system of the wind turbine has failed; if the brake system has failed, calculating an initial crosswind position based on a current wind direction angle, and enabling a yaw system of the wind turbine to perform a crosswind operation based on the initial crosswind position; performing a long-period and short-period filter processing on wind direction data acquired during a crosswind process to obtain an average and instantaneous wind direction angle respectively; determining whether a wind direction has a sudden change based on the average and instantaneous wind direction angle; and if the wind direction has a sudden change, calculating a new crosswind position based on the average wind direction angle, and enabling the yaw system to perform a crosswind operation based on the new crosswind position.

A wind turbine which is configured to be disposed in or above a sea floor is provided. The wind turbine includes a tower configured to protrude from a sea level and having a transmitter configured to transmit an electromagnetic wave to be reflected on the sea level and a receiver configured to receive the reflected electromagnetic wave, wherein at least one of the transmitter and the receiver includes a leaky feeder; and a processing unit being in communication with the receiver and configured to analyse the reflected electromagnetic wave such that a wave characteristic of the sea level is determined.

A fault gas detection system for a liquid filled high voltage transformer, the transformer including a main tank and an expansion tank the tanks fluidic connected by an exchange conduit such that gas and/or a transformer liquid is able to exchange between the tanks, the gas detection system including: a chamber with a top cover, a predefined horizontal level-plane in the chamber defining a maximum liquid level of a transformer liquid in the chamber during use, a fluid-channel including a fluid-egress at a level equal to or higher than the top cover and a fluid-ingress lower than the level of the level-plane, a level sensor designed to measuring and/or indicating a liquid level.

A respective transformer and a respective wind turbine system is also provided.

A measurement system is provided for a wind turbine having a plurality of rotor blades mounted to a spinner at the front of a nacelle and arranged to rotate in a rotor plane. The measurement system includes a measuring device for determining a pressure at a number of pressure measurement points. The pressure measurement points are arranged in front of the rotor plane, an analysis module for generating a control signal on the basis of the pressure measurements, and output means for issuing the control signal to a controller of the wind turbine.

A method for detecting a shadow condition from a wind turbine and a system for detecting a shadow condition are provided. An atmospheric condition detected from an atmospheric condition detector is compared to a threshold. From the comparison a determination is made that the atmospheric condition is shadow producing. The shadow condition is detected using the determination.

A method for optimizing power production of a wind turbine includes determining at least one operational constraint for the wind turbine. The method also includes operating the wind turbine with at least one operational constraint being activated. Further, the method includes varying a tip speed ratio for the wind turbine while the at least one operational constraint is activated so as to maximize a power coefficient of the wind turbine.

The present invention provides improvement of the operation of a wave energy system by use of a method for predictive control (COM) of the converter machine that maximizes the energy generated by considering the energy conversion efficiency (MOD ENE) and a wave prediction (PRED). Furthermore, the method according to the invention determines the optimal control by minimizing an objective function weighted and discretized by the trapezoidal rule.

The present disclosure provides a control method and device for avoiding run-away, and a wind turbine. The method may include: determining whether a brake system of the wind turbine has failed; if the brake system has failed, calculating an initial crosswind position based on a current wind direction angle, and enabling a yaw system of the wind turbine to perform a crosswind operation based on the initial crosswind position; performing a long-period and short-period filter processing on wind direction data acquired during a crosswind process to obtain an average and instantaneous wind direction angle respectively; determining whether a wind direction has a sudden change based on the average and instantaneous wind direction angle; and if the wind direction has a sudden change, calculating a new crosswind position based on the average wind direction angle, and enabling the yaw system to perform a crosswind operation based on the new crosswind position.