The annual routine maintenance of wind farms is the main guarantee for the safe and reliable operation of wind turbines. Wind farms should adhere to the principle of prevention and planning and maintenance, and formulate a feasible annual maintenance plan based on the annual routine maintenance contents provided by the unit manufacturer and the actual conditions of equipment operation. At the same time, work should be carried out in strict accordance with the maintenance plan, and the maintenance cycle and contents must not be changed without authorization. It is practicable to repair and repair, and the equipment must be in normal operation.

The operating personnel should carefully study the structure, performance and working principle of the main components of various types of units, and to some extent understand the main assembly process of the equipment and the quality standards of key processes. Pay attention to the cultivation and accumulation of basic skills and work experience in daily work, continuously improve the methods of wind power operation and maintenance management, and improve the level of equipment management.

I. Main contents and requirements of annual routine maintenance

Electrical part

1) Inspection of sensor function test and detection circuit;

2) Inspection and fastening of cable terminals;

3) Main circuit insulation test;

4) Cable appearance and generator lead-out terminal inspection;

5) Visual inspection of main electrical components (such as air circuit breakers, contactors, relays, fuses, compensation capacitors, overvoltage protection devices, lightning protection devices, thyristor components, control transformers, etc.);

6) Modular plug-in inspection and fastening;

7) Display and control button switch function check;

8) Circuit inspection of electric drive pitch adjustment system (inspection, test and regular replacement of components such as drive motor, energy storage capacitor, converter device, collector ring, etc.);

9) Check the sealing condition of the control cabinet;

10) Check the working condition of the unit heating device;

11) Unit lightning protection system inspection;

12) Grounding device inspection.

2. Mechanical part

1) Check the bolt connection torque;

2) Lubrication check of each lubrication point and grease filling;

3) Oil level and pressure check of lubrication system and hydraulic system;

4) Check the degree of contamination of the filter and replace it if necessary;

5) Check the operation status of the main components of the transmission system;

6) inspection of the working position of the blade surface and the tip spoiler;

7) Functional test and inspection adjustment of the pitch adjustment system;

8) yaw ring gear meshing condition check and tooth surface lubrication;

9) Inspection and test of hydraulic system operation;

10) caliper disc brake pad clearance check adjustment;

11) inspection of the degree of aging of the cushion rubber component;

12) Coupling coaxiality check;

13) Inspection and fixing of lubrication pipelines, hydraulic pipelines and cooling circulation pipelines;

14) Tower weld, flange clearance inspection and functional inspection of ancillary facilities;

15) Inspection of the anti-corrosion condition of wind turbines.

Second, the annual routine maintenance cycle

Under normal circumstances, the annual routine maintenance cycle of a wind turbine is fixed unless the equipment manufacturer's special requirements are:

New operation unit: 500h (after one month trial operation period) routine maintenance;

Commissioned units: 2500h (six months) routine maintenance;

Third, the preparation of maintenance plans

The annual routine maintenance plan for wind turbines should be based on the annual routine maintenance content provided by the unit manufacturer, combined with the actual operating conditions of the wind turbines, and compiled before each maintenance cycle. The content of the plan mainly includes work start time, work schedule, work content, main technical measures and safety measures, personnel arrangements, and special inspection items that should be paid attention to the operation of the equipment.

In the planning, the geographical environment of the wind power station and the characteristics of the maintenance work of the wind turbine should be combined. Under the premise of ensuring the safe operation of the wind turbine, the maintenance work time can be adjusted according to the actual needs, so as to avoid the wind speed as high as possible. Or a period of bad weather conditions. This not only reduces the power loss caused by the maintenance work, but also reduces the maintenance cost. It also helps to improve the working environment of maintenance personnel, further increase the safety factor of work and improve work efficiency.

Fourth, the organization and management of annual routine maintenance

Routine maintenance organization form:

The annual routine maintenance of wind turbines accounts for a large proportion of the annual work tasks of wind farms. How to organize and manage them scientifically and rationally is of vital importance to the economic operation of wind farms.

Depending on the installed capacity and personnel composition of the wind farm, there are two main types of organization: centralized parallel operation and decentralized flow operation:

1. Centralized parallel operation means that in a relatively concentrated time, the maintenance work group concentrates manpower and material resources, and the multiple work faces are grouped in parallel. Small and medium-capacity wind farms with a small installed capacity are mostly used in this way.

Features: The construction period is relatively short, which is convenient for production mobilization and organization management. However, there is a relatively large amount of personnel investment and a large demand for maintenance tools.

2. Dispersed flow-type operation refers to dividing the whole maintenance work into several stages according to the nature of work, scientifically and rationally assigning work tasks, realizing professional division of labor and cooperation, and maximizing reasonable overlap between work to better guarantee Quality of work and increase labor productivity. Suitable for large and medium-sized wind farms with a large installed capacity.

Features: The use of personnel input and maintenance tools is more reasonable, labor productivity is higher, and costs are lower. However, the construction period is relatively long, and the requirements for organizational management and personnel quality are relatively high.

Before the annual routine maintenance work begins, the person in charge of the maintenance work should select the appropriate work organization according to the actual conditions of the equipment and personnel of the wind farm, and formulate a careful and reasonable annual routine maintenance plan to implement the spare parts required for maintenance work. And the consumption of materials, the safety equipment required for maintenance work and the quantity of fixtures with precision requirements have passed the corresponding level of appraisal according to the prescribed procedures, and have been put in place.

In order to make each maintenance team understand the maintenance plan and schedule, a routine maintenance preparation meeting attended by maintenance personnel and the heads of various departments of the wind farm should be held before the annual routine maintenance work is officially started. Good work between various departments, "prevention first" urges the inspection of the implementation of various safety measures, determines the responsible person of each team, "people-oriented" to achieve responsibility, division of labor, and ensure the maintenance plan The work content was carefully implemented and the corresponding quality records were filled in as required.

Work should be "safe production, civilized operation", cherish tools, save materials, control consumption and reduce costs under the premise of ensuring quality. At the same time, we should also pay attention to the mastery of work progress, strengthen organization and coordination, pay close attention to the health and life of frontline maintenance personnel, and improve the cohesiveness of enterprises in actual production.

V. Summary of maintenance work

1) The maintenance and repair work of wind turbines must take safety production as an important task. In the work, the safety regulations for wind turbine maintenance work should be strictly observed, and the “unification of safety and production” should be ensured to ensure the normal operation of maintenance and repair work.

2) Strictly control the progress of maintenance and repair work, complete the work contents listed in the maintenance and repair plan within the planned downtime, and meet the required technical standards. And fill in the relevant quality records as required, and organize and file the documents in time after the signature of the person in charge of the work.

3) Cost control should be strengthened during the work process, strict management, and overall arrangement to avoid cost overruns.

4) Pay attention to keeping the work site sanitation, waste and garbage collected, centralized treatment, and establish a good image of clean energy.

5) After the maintenance and repair work is completed, the person in charge of the maintenance work shall summarize and summarize the work reports submitted by each team, organize the team members to analyze and study the problems and hidden dangers found in the maintenance work, and take timely targeted measures to further Improve the integrity of the device.

6) After the completion of the entire work process, the person in charge of the maintenance work shall summarize the completion of the maintenance and repair plan and the quality of the work. At the same time, it is necessary to comprehensively analyze the problems found in the maintenance work, analyze and evaluate the operation status of the wind turbines in the maintenance period, and explain the expected operating conditions and precautions of the wind turbines in the next maintenance cycle. Work provides a useful accumulation.

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