Wind energy is the most competitive and development prospect of modern society, a renewable energy, wind energy for power generation that KW Wind Driven Generator is currently in China's energy supply play an important role in a new technology. It is of great significance to study the KW Wind Driven Generator generation technology to reduce the introduction of foreign units and to promote the continuous development of KW Wind Driven Generator generation in China.
The basic principle of KW Wind Driven Generator, wind energy has a certain kinetic energy, through the wind turbine will be converted into mechanical energy, drag the generator power generation. The principle of KW Wind Driven Generator generation is to use the wind to drive the windmill blades to rotate, and then through the speed changer to increase the speed of rotation to promote the generator power generation. According to the current windmill technology, about 3m / s breeze speed can start generating electricity. The principle of power generation is very simple, the kinetic energy of the air flow on the impeller, the kinetic energy into mechanical energy, thus promoting the rotation of the blade, driving the generator to power.
The characteristics of KW Wind Driven Generator generation
(1) Renewable clean energy
(2) the construction period is relatively short
(3) installed capacity scale flexible
(4) high reliability
(5) low cost
(6) operation and maintenance
(7) the actual area is small
(8) stand-alone capacity is small
Wind turbine classification, according to its capacity can be divided into: small (10kw below), medium (10-100kw) and large (100kw above) wind turbine. According to the spindle and the ground relative position is divided into: horizontal axis and vertical axis wind turbine. Horizontal axis wind turbines are one of the most successful forms of wind turbines in the world. The main advantage is that the wind turbines can be set up relatively high from the ground, thus reducing the dynamic characteristics of wind turbines due to winds and winds influences. In this article, the wind turbine is referred to as a large and medium-sized horizontal wind turbine.
(1) fan cabin
The cabin is the key equipment for wind turbines, including gearboxes, generators, control equipment and so on.
(2) wind wheel hub
The blade is mounted on a fan hub called a wind wheel, which includes a blade, a hub, a main drive shaft, a pitch motor, and the like. One of the most critical components of a wind turbine is the blade, and most of the rotor blades are made of glass fiber reinforced plastic (GRP). Low-speed shaft is the rotor shaft and gear box connected together, due to bear the work of a larger torque, the speed of less than 50r / min, made by 40Cr or other high-strength alloy steel made.
(3) fan speed changer
Fan gearbox is the gear box, wind turbine is one of the key components.
(4) fan coupling
Gearbox and the generator is connected with the coupling, usually the coupling and brake design together.
(5) fan brake brake device
The brake is a device that stops the rotation of the wind turbine, also known as a brake brake.
(6) fan generator
Wind turbine is one of the most critical components of the generator, its performance is a direct impact on the overall efficiency and reliability.
(7) tower tower tower
The wind turbine tower tower is a bracket that supports the wind turbine.
(8) speed control mechanism
The speed of the fan will vary with the wind speed. In order to make the fan wheel running normally smooth the required speed under the device called speed control system, speed control device only in the rated wind speed above the speed of work.
(9) fan steering (yaw) device
The yawing device is a device that keeps the wind wheel upright against the wind.
(10) computer control system for wind turbine
Microcomputer control system is a discrete control, according to the design program gives a variety of instructions to achieve automatic start, running the unit failure of automatic shutdown, over vibration shutdown and other automatic control. Self-fault diagnosis and failure of the computer terminal failure to be repaired, the wind turbine crew can achieve fiber optic network management, the failure of the fan in the substation control computer terminal computer terminals and display read out, call out procedures and modify procedures , Modern wind generators to achieve the scene of unattended automatic control.
(11) fan cable torsion cable counter
When the wind turbine is deflected in one direction for too long, the cable will become more distorted, causing the cable to break or other faults. So the wind turbine is equipped with a cable twist counter, and automatic alarm device and automatic cable device.
Here on the operation and maintenance of the fan to do some discussion.
First, the fan running
Wind turbine control system is the use of industrial microprocessor computer control, run by a number of CPU side by side, and through the optical fiber communication lines connected with the computer can be remote control and maintenance, so the fan is running the remote troubleshooting and operation data Statistical Analysis and Analysis of Fault.
1. Fan remote operation troubleshooting
Most of the wind turbine faults can be remotely reset and fan automatic reset control. The stability of the fan and the quality of the power grid is closely related, in order to carry out two-way protection, the fan set a multiple protection failure, such as high and low power, these failures can be automatically reset. Due to the uncontrollable wind energy, as well as the temperature limit can also be automatically reset,
2. Statistical analysis of fan operation data
Through the statistical analysis of the running data, the operation and maintenance work can be quantified and evaluated, and the effective theoretical basis for the design of the wind farm, the assessment of the wind resources and the selection of the equipment can be carried out, and the operation of the wind farm operation equipment Detailed statistical analysis is an important part of wind farm management.
The main contents are: the fan of the monthly power generation, field power, fan equipment, normal working hours, failure time, the standard use of hours, power outages, failure time. Power generation statistics report is one of the important contents of the operation and maintenance work, the statistics and analysis results of the power curve data, and provide the practical basis for the increase of the output and the utilization rate of the fan. Through the statistics and analysis of the wind conditions data, we can grasp the law of the seasonal variation of the fan, and can make a reasonable schedule of regular maintenance work to reduce the waste of wind resources.
3. Analysis of Common Faults of Fan
Through the analysis of the failure of the fan, you can reduce the time to troubleshoot or prevent the occurrence of multiple failures, reduce downtime, improve equipment integrity and availability.
Second, fan maintenance
KW Wind Driven Generator generator is a set of electrical engineering, machinery, aerodynamics and other disciplines of integrated technology products, all closely linked, closely related. Fan maintenance can be divided into regular maintenance and routine maintenance in two ways.
1. Regular maintenance
The main contents of the maintenance work are: the bolt torque check between all the couplings (including the electrical connection), the grease between the transmission parts and the various functions of the test self-test. Regular maintenance allows the equipment to maintain the best operating conditions and extend the life of the fan.
When the fan is running, the bolts of the connecting parts are long-term in the resultant forces of the various vibrations. They are easily loosened. In order not to cause the local bolts to be sheared, Check the bolt torque. Lubrication system with thin oil lubrication (or mineral oil lubrication) and dry oil lubrication (or grease lubrication) in two ways. Wind turbine gearbox and yaw reduction gear box is used in thin oil lubrication method, the maintenance method is added and sampling test method, these components due to the higher operating temperature, easily metamorphic, resulting in bearing wear.
2. Fan maintenance routine maintenance
The fan in operation, often there will be some failure to the scene to deal with, and sometimes we can carry out the routine maintenance work. First of all to carefully check the safety platform inside the fan and the ladder is strong, whether the normal work of the lift, the tower in the lighting is good, the hydraulic station gauge pressure is normal hydraulic oil and gear tank oil level is in the normal position, The presence or absence of abrasion between the rotating parts, the indication of the gear oil and the hydraulic oil, whether the normal position and the running sound, and the like. The second is to listen, listen to the control cabinet whether there is a discharge of the sound or abnormal sound, there may be a voice terminal loose, or poor contact, to be carefully checked, listen to the sound when yaw is normal, Sound, listen to the gear box with or without sound, listen to brake brakes and brake pads between the sound or the like, listen to the work of the generator sound and whether the abnormal sound, listen to the sound of the blade cut the wind is normal. Third, after work to clean up the clean work site, easy to observe the future work for leaks.
Although the above routine maintenance and repair project is not very complete, as long as we can be done every time carefully, carefully, will be able to prevent in advance, early detection and timely processing to prevent the occurrence of hidden dangers, improve the use of equipment intact and availability.
In order to truly run and maintain the wind turbine, usually also on the wind turbine related theoretical knowledge in-depth study and study summary, do a good job of various maintenance records and archives, the various types of fan multiple, repeatability Failure to conduct in-depth and detailed research and analysis, and strive to make effective prevention and reduce losses. Only early detection, early processing, as soon as possible maintenance maintenance, take preventive measures, is the highest level of our operation and maintenance.