| 摘要 |
FIELD: wind-electric power engineering; wind-electric power plants using synchronous generators primarily operating into supply mains. SUBSTANCE: method involves aerodynamic limitation of power capacity developed by windwheel due to varying position of its blades relative to wind and windwheel stopping within preliminary time interval allowing for reducing windwheel power by approximately 40-60% of its rated value; then, while disconnecting generator from supply mains, mechanical brake of entire set of revolving members of plant is imposed in addition onto aerodynamic power limitation; braking torque is set as constant value corresponding to rated torque in plant transmission, whereupon, at same braking torque, moment of inertia of revolving members of plant being braked is reduced in steps by separating set of revolving members into at least two or more parts. Braking torque is applied to the following revolving members of plant: to intermediate shaft of multistep step-up gear drive, or to output shaft of step-up gear drive, such as, by applying it to generator shaft. Additional braking torque may be built up by operating the generator as electromagnetic brake which is turned on in absence of blade position angle control. At windwheel power capacities below 40% of rated value, across-the-line braking of revolving members of plant is effected without aerodynamic power limitation. Stepwise variation of moment of inertia of revolving members is made in time interval found from equation: t= (2-5)T, where T is low-frequency oscillation period of windwheel blade in minimum-stiffness plane. EFFECT: enlarged functional capabilities and, hence, improved economic efficiency of plant due to extended range of working wind flow speeds during power generation and reduced transient time in plant braking and stopping; improved safety and reliability in operation due to provision for remote braking, improved safety for personnel, extended service life due to reduced transient loads on transmission parts, power structure, and windwheel blades. 10 cl, 3 dwg |
