45results about How to "Reduce ultimate load" patented technology

The invention discloses a wind generating set variable rate feathering halt method based on accelerated velocity of an engine room. On the basis of a conventional control strategy, a variable rate feathering module based on the former accelerated velocity and the current accelerated velocity of the engine room is added. The method comprises the steps that when the set enters the halt logic, firstly, whether the fault type triggered by the set is software hypervelocity halt alarm or not is judged; If no, the corresponding halt logic action is taken, and if yes, the variable rate feathering haltlogic based on the accelerated velocity of the engine room is adopted; the former accelerated velocity and the current accelerated velocity of the engine room are measured in real time through a sensor; after filtering is conducted through a filter, a feathering rate value is output to be superposed with an original feathering rate value output by a controller; and then, amplitude limiting is conducted, and a final feathering rate value is multiplied by the cycling time of the controller, so that a final pitch angle given value is obtained and transmitted to a variable pitch system till all vane pitch angles reach the maximum pitch angle and the feathering halt action is completed. By means of the method, the load optimization control, under the special working condition, over the wind generating set can be achieved.

The invention discloses a control method, system, equipment and storage medium for the pitch angle of a wind turbine, belonging to the field of wind power generation. The wind direction is measured by detecting the wind direction meter and compared with a preset threshold to determine whether an extreme wind direction change has been encountered, and through scheduling Minimum pitch angle to cope with extreme loads caused by rapid changes in wind direction. The positive and negative direction of the wind direction measured by the anemometer is used as a judgment. Since increasing the minimum pitch angle when the negative wind direction is coming, the load experienced by the large components of the unit will be greater than that of the positive wind direction, so only increase the minimum pitch angle for the positive wind direction. Control of the distance from the angle to reduce the ultimate load. Compared with the control method that does not distinguish the wind direction, it further reduces the ultimate load brought by the unit when the extreme wind direction changes. Using the method of judging the wind speed threshold, the current measured wind speed exceeds the threshold as the primary condition, to avoid the problem of generating loss caused by increasing the pitch angle due to the small wind speed but not yet impacting the bending moment of the unit.

The invention relates to a novel wind turbine segmented blade. A blade tip segment and a blade root segment are connected through a local variable pitch device, a flange and a connection piece of a connection transition segment; the blade root segment is a cylindrical rotating body structure or a rotating body structure in a similar cylinder shape, and the outer surface of the blade root segment is wrapped by a lightweight rectifying shell; and the position between the rectifying shell and the blade root segment is filled with a lightweight sandwiched material. The rectifying shell comprises afront edge extending shell structure and a rear edge extending shell structure which correspondingly wrap the front edge and the rear edge of the blade root segment, and wing shapes correspondingly lengthening the front edge and the rear edge are formed. The novel wind turbine segmented blade facilitates manufacturing, transporting and installing of blades, the production efficiency can be effectively improved, and cost is lowered.