Nanjing Continental Electric Co., Ltd. is a pursuit of sustainable management and technology continues to update the enterprise. From micro wind turbines with low levels of early technology to smaller wind turbines at higher levels, in recent years, and in response to the Government's policy of promoting the move from a manufacturing power to a manufacturing powerhouse, in-depth study and discussion of the operation behavior and system control theory of wind turbines, overcoming difficulties and technical checkpoints, has established itself the theory of wind turbine system behavior and control And has developed the wind turbine control system hardware and software and has been successfully used in the variable paddle, steering and braking of the active control wind machine, this control system can also be applied to the highest level of large wind turbines, breaking through the foreign technology blockade.
The following first describes the behavior of wind turbines, according to their behavior and characteristics can be divided into four categories (see above):
A. Power below 1kW: Micro wind turbine (micro winds Turbine);
Such wind turbines because of small size and light weight, more use of cable tower frame and no foundation base to reduce costs; the characteristics of high speed operation is generally greater than 500rpm or even some up to 1000rpm and more than one or two vibration frequency, mostly passive control, steering system for the passive system with tail wing contains sliding ring, including small moment of inertia, Acceleration and deceleration are very fast and difficult to set speed. Generally used for Toy & Hobby.
Protection mechanism: Generally more than the protection speed is to start the generator three-phase short-circuit brake, a few will add load resistance, first reduce the speed and then brake to avoid the generator burning;
Commonly used forLandscape Complementary power generation system。
B. Power approx. 1kW to 15kW: Small wind turbines with passive control (Small winds Turbine with passive controls);
The characteristic is less than 500rpm speed, the rotational speed changes quickly, will cross the first vibration frequency; attention must be paid to the gyroscope effect at high speed so that the wind turbine can not be fixed and cannot be turned, resulting in the pendulum tail mechanism (Auto Furl) is invalid. The steering system is mostly a passive system with tail wing, which includes sliding ring.
5000W Wind TurbineThe protection mechanism is often leakage, pendulum tail, rotor tail, passive yaw, passive paddle, generator three-phase short-circuit brake and so on.
Commonly used in independent or networked landscape diesel energy storage intelligent Management System system.
Based on cost considerations above two type wind turbines are mostly passive control.
C. Power approx. 10kW to 2MW: Active small wind turbines, medium and large wind turbines. (Small wind Turbine with active control, Large/Medium wind Turbine);
The operation is mostly below the first vibration frequency; passive (Stall) and active (Pitch) propeller system; active yaw steering; small system deformation can not be considered; transmission system has two types of direct drive and variable speed (2 points or 3 point support); doubly-fed generator (DFIG) is more dominant.
D. Power greater than 1.5MW: large and ultra-large wind turbines (Large winds Turbine).
Operating below the first vibration frequency, the use of active paddle and steering control, the need to consider large deformation, in order to reduce weight will be a direct drive or transmission chain simplification measures such as Compact, Hybrid, offshore wind power wind turbines have been more than 5MW machine; generators in order to reduce the maintenance of the sliding ring has a mining permanent magnet generator (PMSG) trend.
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