Technical analysis of five major causes of investment in large wind turbines (1)

Recently, the country has listed wind power equipment as an industry with "overcapacity", but in the face of the urgent situation of energy conservation, emission reduction and climate change, it faces a shortage of 1% of total national power generation from wind power (the total number of large-scale wind power installations in the country so far. But only tens of thousands of units), in the face of a wide range of wind energy resources and their varieties that have the greatest potential for development in the renewable energy field, the newly emerging wind power equipment industry should not be listed as a target anyway, so we do not It is difficult to interpret the meaning of another level: the market is not satisfied with the technical status of large-scale wind power equipment, and the unsatisfactory appearance is “overcapacity”.

Indeed, in the current large-scale wind power construction, “high cost, low effectiveness, many failures, few functions, and difficult expansion” are the five major realities that have long been complained and recognized by various related parties. This also constitutes the “overcapacity” appearance of wind power. The five main reasons for the low investment value are that it is difficult for investors to accept a large number of buy-outs to create overcapacity, and through these appearances, direct cause and effect can be obtained from the technical analysis of the overall shape and structure of existing large wind turbines. Some of the causal answers may form cross-compositions, that is, one cause may cause the appearance of multiple appearances or further extend the degree of influence; vice versa, an appearance may be formed by multiple causes, so it is difficult to completely One by one, the subdivision is clearly defined. The following is a summary analysis of the causal relationship between its main representation and structure:

1. Technical analysis of causes of high costs

Regardless of any form of wind turbine, the effective wind collection area, wind capacity, and wind strength in the unit wind area and the size of the driving rotating arm that can be formed by the wind output position determine the capacity of the wind turbine output capacity. The direct cause.

From the perspective of the blades of the existing large-scale wind turbine generators, the wind turbine adopts the attack angle and the wind output method. Therefore, it is difficult for the blades to form a more spacious design for the wind-sweeping format, and the length of the single wind-wheel blade is extended with a long length. The increase in the total effective windage area that can be formed is very limited, and it is difficult to design a large windage area for a single wind turbine blade.

From the perspective of the weight of the long blades and the area of ​​the wind output and the distribution of the wind arms, the weight of nearly 50-60% of the existing large blades is concentrated at or near the root of the blade. Circular, the main role is to form the support ability of the root of the ultra-long blade, can not form the role of wind output and wind area, and can form a large rotating arm away from the main shaft resulting in the formation of the actual effective rotation torque of the tip It is so narrow (the physical moment (M) refers to the force (F) that pushes the object and is multiplied by the arm distance (L) to the axis of rotation: that is: M = F × L).

It can be seen that the large-diameter design of the current wind turbine does not result in the formation of a corresponding ratio of large-output capacity, and thus it is difficult to form a significant increase in effective power design (which is also one of the causes of low effectiveness and difficulty in development). However, the comprehensive cost of the equipment formed when the single-unit output capability of the equipment can not be formed is bound to be very high, because the existing equipment has a complex wind power structure, and each unit must form a support structure, operation function, and adjustment control in all aspects. , Transmission equipment, etc. are all available.