Wind and solar energy, as representatives of renewable energy, have many advantages; they are a constant source, do not produce greenhouse gases, do not aggravate climate change, can reduce people's dependence on traditional energy sources, etc. With the increasing number of wind farms, the development of new wind turbines and efforts to reduce the cost of wind power generation are important aspects of promoting wind power generation. Among the many measures to reduce costs, technically improving the annual power generation capacity of wind turbines is an important aspect.
Wind power technology principle
The principle of wind power generation is to use the wind to drive the fan blades to rotate and drive the wind wheel to rotate when the wind blows to the blades, and the wind energy is converted into kinetic energy, which in turn drives the generator to generate electricity.
The process of wind power generation is similar to that of thermal power and hydroelectric power in that other energy is used to drive the generator to generate electricity. The physical principle of the generator is the law of electromagnetic induction we learned in elementary school, that is, when a conductor does the movement of cutting magnetic induction lines in a magnetic field,
the conductor will produce current, in wind power generation, what drives the movement of this conductor is the kinetic energy generated by the wind blowing the blades, in thermal power is the burning of coal to turn water into water vapor and then push the motor to generate electricity, while in hydropower is the kinetic energy of water flow to make the motor generate electricity.
The advantages of wind power
The advantages of wind power generation are obvious. First of all, wind energy, unlike conventional energy, is a renewable energy source, inexhaustible, and is conducive to alleviating the problem of tight power supply, and is considered to be the main new energy source in the 21st century.
- Wind power does not pollute the environment and does not emit carbon dioxide and other harmful gases in the process of use, so it is a clean energy that is very friendly to the environment.
- The installed scale of wind power generation is flexible, and it can be built in shallow seas or on beaches, without occupying large areas of arable land.
- The time required to build a wind turbine is short, and it can be put into operation quickly in a short time, even if it is a single device.
- Wind power generation is beneficial to mitigate the effects of other severe weather. The existence of wind power generation equipment is conducive to weakening the local wind influence, thus reducing the negative impact of high winds, sand and other weather, and reducing the probability of dust storms.
In the dry northwest region, wind power plants play an important role in enhancing the southeast wind, which can push the warm and humid air currents forward, thus increasing precipitation in the area and alleviating the drought problem.
- Wind power generation is very stable and has a low probability of failure. Even if there is a failure, the repair process is relatively simple.
Improve wind turbine performance
The performance of wind turbine is the basis of the output performance of the whole wind farm, and improving the power generation performance of wind turbine is the primary means to improve the power generation capacity of wind farm. An important manifestation of the performance of the wind turbine is the power curve of the wind turbine. The essence of the power curve of the wind turbine is the efficiency of the wind energy utilization of the wind turbine, that is, how much of the wind energy can be converted into electricity by the wind turbine. From the perspective of a single unit, performance actually includes the trouble-free operation time of the unit.
Siting optimization
For new wind farms, the site selection directly determines the subsequent output performance of this wind farm. The previous macro site selection, machine location selection, unit selection, tail current influence, natural influence and other factors lead to unsatisfactory power generation. Therefore, wind farm site selection should be well thought out, with multiple site inspections, collection of relevant data analysis, and selection of the best site.
Wind Resources
1.Improve the wind resource condition of individual units
Relocate units with poor wind resources to locations with good wind resources; raise the tower or reduce the roughness near the location
2 .Improve the wind resource situation of the whole field
Through the reasonable allocation of wind resources in the whole field, reduce the influence of tail flow between units, and sacrifice the output of individual units to optimize the power generation performance of the whole field.
Air sweeping area
1 .Longer blade (blade root or leaf tip lengthening)
2 .Small blade for long blade
Air density
Optimization of Kopt regulation based on air density tracking
Wind energy conversion rate
1. Restoring or enhancing the aerodynamic characteristics of the blades
Clean blade contaminants; repair blades; zero blade calibration; add vortex generator
2 .Optimize control strategy to track optimal Cp
1) Dynamic optimal pitch control (optimized from traditional table check mode to PID control mode)
2) Dynamic optimal pitch control; dual-mode control (to improve the operating efficiency of doubly-fed units in the low wind speed phase)
3) Yaw optimization (improve the accuracy of wind alignment by laser deflection correction)
4) Cut-in and cut-out wind speed optimization (calibration of anemometer)
Operating efficiency of large components
1) (gearboxes, generators, converters, etc.)
2) Optimize the design defects of related components: such as low power of radiator, too small relay current threshold, etc.
3）Restore and improve the accuracy of some sensors and components: such as speed sensor accuracy, temperature control valve transformation, etc.
(4) According to the specific environment of the wind farm, such as the spring willow fluttering easily block the heat sink, the winter temperature is too low to affect the lubrication, etc., the corresponding optimization strategy can be developed to ensure the normal healthy operation of the relevant components
Management perspective
- Maintenance strategy optimization: analyze the wind speed and power limitation data in the past years, reasonably compile the annual maintenance and technical reform time plan, arrange the areas without power limitation in the light wind period, and arrange the areas with power limitation in the months with serious power limitation.
- Spare parts management optimization: do the statistics of spare parts, analyze the usage, accurately grasp the demand of common spare parts, and reasonably carry out reserve.
- Load scheduling management optimization: actively communicate with dispatch, under the grid dispatch load instruction, according to the wind farm equipment characteristics, determine the number of wind turbine operation and wind farm delivery load, to achieve the purpose of increasing and grabbing power.
- Field electricity management optimization: integrate various types of system operation information, combined with the characteristics of electrical operation mode, targeted according to the annual, quarterly, monthly different working conditions, electrical equipment optimization work, and constantly improve the efficiency of power transmission, reduce the field electricity rate.
- Technology exchange and transmission: wind farms are generally located in remote areas, staff mobility, to ensure the exchange and transmission of professional technology, to ensure the level of operation and maintenance.
In fact, under the real threat of climate change, along with the "wave of carbon reduction" that is being set off globally, the energy structure based on fossil energy is gradually transforming to the energy structure based on wind and solar energy and other renewable energy sources, and using electricity as the most important energy carrier to support economic production and social life.
As an important way to achieve carbon neutrality, building a high proportion of renewable energy power system has increasingly become a common global trend.
Boland Renewable Energy Co.,LTD As an integrated new energy power company, providing you with high quality integrated wind energy , solar energy and energy storage system solutions.Boland is now a subsidiary of CRRC, and is responsible for the overseas expansion of CRRC's wind power & solar power business. We have a relatively complete internal supply chain, service network and excellent product quality and technology.
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