PATENT CLAIM ANALYSIS

Application Number: 15765766
Application Type: Utility
Filing Date: 2018-04
Publication Date: 2018-10
Patent Classification: ["415", "004300"]

Abstract:
The invention details a method of determining and controlling the attack angle of fixed-speed wind turbine blade aiming at finding out an appropriate angle of attack for optimal extraction of wind energy at low to medium wind speed, which comprises three steps: step 1—defining basic parameters of the turbine including the blade length and width, fixed rotational speed, rated wind speed, start-up speed and the lowest speed at which the turbine is forced to stop, and the relationship with the wasted power; step 2—defining wind speed based on which a set of attack angles can be calculated to form an overall optimal attack angle of the wind turbine blade; step 3—calculate necessary physical parameters to come up with the most effective method of controlling the turbine blade; this invention is applicable to the manufacture of fixed speed wind turbine that can be directly connected to the grid, making wind power costs as low as those of other conventional energy sources.

Claim (Index 2):
A method of determining and controlling an attack angle of a fixed-speed wind turbine blade of a wind turbine in order to establish an appropriate attack angle of the wind turbine blade for effectively harnessing wind energy at low and medium wind speeds and enable stop and restart in low winds, wherein the fixed-speed wind turbine blade having a thin plate as its surface and composed of substantially flat blade segments, and wherein a range of speeds from a lowest speed at which the wind turbine is forced to stop to a rated speed is divided into low, medium and high wind speeds; comprising the steps of:\n first, defining basic parameters of the wind turbine by:\n (a) choosing a linear speed at a tip of the fixed-speed wind turbine blade of between 100-200 km/h; and\n (a1) choosing a fixed rotational speed that enables a length of the fixed-speed wind turbine blade to be defined based on the chosen fixed rotational speed and the chosen linear speed; or \n (a2) choosing a length of the fixed-speed wind turbine blade that enables a fixed speed to be calculated based on the chosen linear speed and chosen length of the fixed-speed wind turbine blade, \n wherein a width of the fixed-speed wind turbine blade is smaller than 10% of the length of the fixed-speed wind turbine blade and no more than 6 m, \n \n (b) defining a lowest wind speed at which wind turbine is forced to stop as the wind speed at which the turbine output is 20% higher than wasted power; \n (c) defining a start-up speed as the wind speed at which the turbine output is 3-4 times higher than the wasted power; \n (d) defining the rated wind speed as one at which the turbine reaches its maximum or rated output; and \n (e) defining a cut-out speed as a highest speed at which the turbine is forced to stop; \n second, defining a wind speed v c  which ranges from low to medium to be used with a function for wind turbine power calculations to determine a set of optimal attack angles \u03b1 i  of the fixed-speed wind turbine blade at each position i along the blade, at a distance d i  from a center of rotation, and at a fixed rotational speed \u03c9 i  of the wind turbine; and using a set of angles of attack \u03b1 i  to determine an overall optimal attack angle \u03b1 c  of the fixed-speed wind turbine blade; third, controlling the wind turbine by:\n as the wind speed reduces by one unit, from the wind speed IT, for determining the blade attack angle (v c =a m/s (km/h or mgh)) to the lowest speed at which the wind turbine is forced to stop, increasing the angle of attack by a value of \n 90 \ue89e \u00b000 \u2032 - \u03b1 c a ; as the wind speed increases by one unit, from the speed at which the turbine is forced to stop to the rated wind speed, decreasing the angle of attack by a value of 90 \ue89e \u00b000 \u2032 - \u03b1 c a ; \u2003and as the wind speed falls by one unit, from the rated wind speed to the wind speed v c , increasing the angle of attack by a value of 90 \ue89e \u00b000 \u2032 - \u03b1 c a .

Metadata:
- Claim Count in Document: 1.0
- Percentile: 91.0
- Lexical Diversity: 1.94318
- Patent Class: 415.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['15618180', '14421312', '14760687', '13351690', '13331027']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7713658278113097
- 35 USC 102 Novelty (BERT): 0.4492304382432054
- Combined Prediction Score: 0.7391522888544992
- Mean Citation Score: 233.726846
- Max Citation Score: 244.3895
- Similarity Product: 199.9011325910092

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 1
- Claim Label 112: 1
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test