37 results about "Variable speed wind generator" patented technology

Provided is a power generator, including a plurality of wind power generators generating electrical power using wind power energy, and variable-speed wind power generators (20a, 20b) connected between the power generator and an electrical power system. The variable-speed wind power generators (20a, 20b) equalize an output of the entire power generating system by outputting power for correcting for a drop in output of the power generator.

Provided is a power generator, including a plurality of wind power generators generating electrical power using wind power energy, and variable-speed wind power generators connected between the power generator and an electrical power system. The variable-speed wind power generators equalize an output of the entire power generating system by outputting power for correcting for a drop in output of the power generator.

The invention discloses a pitch change and torque change combined control method of a variable-speed wind turbine generator system. Unmodeled dynamics and disturbance are considered to build a simplified dynamic model of the wind turbine generator system. Power adjustment error dynamic characteristics are calculated. A sliding mode surface and switching functions are selected to design a self-adaption updating mechanism of sliding mode gaining to obtain sliding mode variable structure electromagnetic torque control signals. Wind wheel rotating speed anticipant error dynamic characteristics aredefined. The simplified dynamic model of the wind turbine generator system is rewritten to obtain a pitch angle initial expression. Approach results of a low-pass filter to non-affine uncertain itemsand disturbance items are substituted into the pitch angle initial expression to obtain a pitch angle final expression. The combined control method can preferably deal with non-affine uncertain characteristics of the wind turbine generator system, is simple in structure and excellent in robustness, can provide more stable wind wheel rotating speed and power generation power, reduces mechanical load of the wind turbine generator system, prolongs the service life, and provides high-quality electric energy to a power grid.

The invention discloses a variable-speed wind generating set maximum wind energy capturing method based on effective wind speed estimation. The method comprises an effective wind speed estimating model and a maximum wind energy capturing controller. In order to acquire an effective wind speed estimated value, a training set of an SVR model is formed by normalized unit historical output data and historical wind speed measured values, penalty parameters and kernel function parameters are selected by a GA algorithm to obtain the trained SVR model, and the model gives out the wind speed estimatedvalue in an online manner; and when the maximum wind energy capturing controller is design, the real-time optimal wind wheel rotating speed estimated value is obtained according to effective wind speed which is given out by the effective wind speed estimating model, nonlinear characteristics and parameter uncertainty of the system are responded by robust factors and a neural network, and therefore, boundedness of rotating speed tracking errors and stability of a wind generating set system are realized. By the method, a mathematical model and parameters of the unit do not require to be used, adesign process is simple, an implementing cost is low, and the capacity of the unit and the economic benefit of a wind power plant can be improved.

The invention relates to a maximum wind energy capturing method of variable-speed wind generating sets. The method includes that current optimum rotary speed of a plurality of wind generators is estimated by capturing conditions of wind energy through the wind generators within previous control periods and is taken as the input of a controller, errors are reduced through proportional control on the basis of an indirect speed control algorithm, the optimum rotary speed in tracking the wind generators is realized, and the maximum output power is acquired. With the method, precise modeling of the wind generators is not needed, nor is measuring of wind velocity; simpleness in structure is achieved, parameters are easy to adjust, production energy is higher than that by a maximum wind energy capturing method and a speed velocity indirect control method which are commonly used in industry, influence of environment factors and structural changes of the wind generators on energy generation can be weakened, a control objective that most of the wind generators are lower than rated wind velocity sections can be met, and great application values are achieved.

The invention discloses a method and system for adding resistance to a transmission chain of a variable-speed wind power generating set, wherein the method for adding resistance to a transmission chain of a variable-speed wind generating set includes: acquiring the high-speed shaft speed of the variable-speed wind power generating set; filtering to obtain the filtered rotational speed; performing phase compensation calculation on the filtered rotational speed to obtain the compensated rotational speed, and performing limit filtering on the compensated rotational speed; The electromagnetic torque before resistance is calculated to calculate the electromagnetic torque after resistance is added to the transmission chain. Therefore, adopting the method and system for adding resistance to the transmission chain of the variable-speed wind-driven generator set of the present invention can effectively increase the damping effect, eliminate system resonance, and reduce the axial load of the wind-driven generator set.

The invention relates to a clean production method for preparing hydrogen energy by using natural wind, and a device used in the method, which belong to the field of regenerative energy utilization. The method is characterized by comprising the following steps: adopting a direct current constant frequency variable speed aerogenerator to generate electricity; transmitting the electricity generatedby the direct current constant frequency variable speed aerogenerator into a rated distribution system, performing electrolysis of water after rated electricity distribution, and introducing hydrogenand oxygen prepared by the electrolysis of the water into a storage tank to be stored; and processing wastewater in a storage pool. In the device, the input end of the rated distribution system is connected with the output end of the direct current constant frequency variable speed aerogenerator, and the output end of the rated distribution system is connected with an electrode terminal in an electrolysis small room. The method and the device use wind energy to produce hydrogen and consume no energy resource, the electric power generated by the aerogenerator needs not to be stored and converted and is used for direct electrolysis after generation, and the capability of a production device changes along with the voltage of the electricity generated by wind power, thus about one third of electric energy loss is reduced to process wastewater so as to reduce the environmental pollution.