Technical analysis of five major causes of investment in large wind turbines (2)

2. The technical analysis of the causes of low effectiveness

Under the same conditions of wind strength, the direct result of the current large-scale wind turbine single blade super long design will lead to a reduction in the rotation speed of the wind wheel, resulting in an increase in the transmission ratio of the gear box, and the ultra-long blade will also lead to the tower effect and The obvious manifestation of the vibration effect;

Increasing the length of the blade will inevitably require strengthening the design of the structural strength of the root of the blade, which will also lead to a huge volume and weight of the blade. Currently, 1.5-2 megawatts of blades have reached about 18 tons, and 3 megawatts have reached 30 tons, and 5 megawatts... ...10 megawatts, according to inertial thinking should be 50t ... 100t? ), because the inertia will lead to the difficulty of driving the overweight blade to start rotating at low wind speed, so it is difficult to form more investment income to obtain time and space.

In addition, the single mode of control is another important reason for the formation of a low effect image, because immediately adopting the control method of rotating fulcrum at the moment of increasing wind power in nature will lead to the loss of profitability at the moment of strong wind, especially in the 3 -5 trillion -10 watts and above will be more apparent under the design power.

3. Technical analysis of the causes of multiple faults

The overall design of existing large-scale wind turbines leads to complex and diverse control requirements, and even extends to the regulation of each blade's wind attitude at any time. The regulatory agencies, structures, and components are in great demand, leading to increased opportunities for failures. The overall design pattern has led to the requirement for the quality and specification of materials and manufacturing of most parts and components that have exceeded the requirements for general machinery and equipment components. Non-high-priced and imported products are capable of doing so, which in turn leads to high costs. the reason. The large increase in gearbox transmission ratio design requirements caused by slower rotation speeds of large wind turbines is also a cause of high failures (a complex structure is one of the causes of high costs).

In addition, compared with the birthplace of technology, China's application environment of high-cold, high-strength wind, and high-strength sunlight directly contributes more to the application of the ultra-long-hanging boom arm rotor blades (polymer materials) and connecting mechanical structures and their durability. Threat (even in places where the technology originates, often hears a broken or fractured blade), and the high altitude settings of the power equipment (high-temperature winter-summer heat and cold changes and inconvenient daily maintenance) and yaw system carry wire and cable rotation The manner of confrontation is also a cause of many failures.