NB/T 31043-2019Technical specification for main control system of offshore wind turbine generator system (English PDF)

3.1 Twist

The wind turbine always yaws in the same direction under certain external conditions, causing the phenomenon of cable entanglement in the cabin.

3.2 Untwist

Under the condition of twisting the cable, the process of making the nacelle yaw in the reverse direction to untie the twisted cable.

3.3 Variable pitch

The process of adjusting the pitch angle.

4.1 Conditions of use

4.1.1 Environmental conditions

Working environment temperature range. According to the relevant regulations of NB/T 31094.

4.1.2 Power supply

4.1.2.1 AC power

a) Range of power supply frequency. 47.5 Hz~51.5 Hz.

b) Power supply voltage variation range. -10%~10% of the voltage rating.

c) Allowable fluctuation range of the power supply voltage. -15% to 10% of the rated voltage.

d) The unbalance degree of the power supply should meet the provisions of Chapter 4 of GB/T 15543-2008 and work normally within its range.

e) The power supply waveform is sine wave, and the harmonic content is less than 5%.

4.1.2.2 DC power supply

a) The allowable deviation of the power supply voltage is -10%~10%.

b) The power supply voltage ripple coefficient is not more than 5%.

4.1.3 Other conditions of use

When the conditions of use cannot meet the above conditions of use, the user and the supplier are required to reach a written additional agreement, and set up separately according to user requirements. meter.

4.2 Test conditions

a) Test temperature. 15°C~35°C;

b) Relative humidity. <= 90% (below 20 °C)

c) Atmospheric pressure. 86kPa~106kPa.

4.3 General requirements

4.3.1 Cabinet

4.3.1.1 The cabinet adopts steel anti-corrosion design, and the protection level is not less than IP54.

4.3.1.2 The cabinet is provided with a public grounding point. All parts of the cabinet shall be well electrically connected to the public grounding point, and electric shock prevention measures shall be provided. The protective grounding is complete.

4.3.1.3 A dehumidification device should be installed inside the cabinet.

4.3.1.4 The cabinet design should meet the installation and maintenance requirements in the tower and engine room, and be easy to install, debug and maintain.

4.3.1.5 The installation process of the buttons, switches, screens, signals and alarm devices of the cabinet, as well as the way of entering and exiting the cabinet shall be consistent with that of the cabinet. The protection level matches.

4.3.1.6 The structure of the cabinet is firm, and the electrical wiring in the cabinet can be plug-ins, connecting wires, terminal blocks, etc., which can withstand electricity and The influence of heat, mechanical strength and vibration on equipment.

4.3.1.7 The operating device is installed in a position that is easy for the operator to operate, and the emergency stop button should be placed in the most conspicuous and easy-to-operate position of the cabinet. The button itself should be equipped with a protective cover.

4.3.1.8 The surface of the cabinet body should be smooth and free of unevenness. The paint layer should be beautiful and the color should be uniform. There should be no blistering, cracks and flow marks.

The cabinet door should be able to open and close flexibly at an angle of not less than 90°, and the top of the cabinet should be equipped with a lifting ring.

4.3.1.9 The structure of the cabinet should be simple and open, easy to reach, and the corrosive surface design should be as smooth as possible. Any necessary reinforcement, Joints and pipes should be arranged as far as possible in places with low corrosion risk, and hollow parts that are difficult to maintain should be welded firmly. Other exposed The metal in the gas should be protected by plating, generally it is better to use electroplating;

4.3.2 Components

4.3.2.1 The main components used in the control cabinet shall have heat and humidity resistance, and their heat and humidity resistance shall comply with the standard GB/T 3783-2008 No.

Requirements specified in 7.1.1.2. The components that should be resistant to humidity and heat are. control module (PLC (programmable logic controller), IPC (engineering Industrial control computer) and other IO modules), circuit breakers, contactors, relays, transformers, transformers, buttons, wires and cables, etc.

4.3.2.2 The internal control module of the cabinet should be powered by an isolated power supply.

4.3.2.3 After the welding of printed boards, plug-ins and other components, there is no phenomenon such as desoldering, virtual welding, loose components or loose fasteners.

4.3.2.4 All solid insulating parts except ceramic materials should have heat resistance, that is, after the parts are subjected to heat resistance test, the indentation spans the largest The size is not more than 2mm.

4.3.2.5 All solid insulating parts except ceramic materials shall have flame resistance, that is, after the parts have undergone the glow wire test (or needle flame test)

No combustion, or even if ignition occurs, the combustion and heat can be completely extinguished within 30s after the glow wire (or needle flame) is removed, and the indication that the silk paper does not Ignite. At the same time, all plastic parts should also have flame retardancy, that is, after the flame retardance test, the length of the burned or damaged part of these parts is not large At 60mm.

4.3.2.6 All components should be installed in accordance with the manufacturer's instructions and comply with the requirements of their respective standards.

4.3.3 Electrical connection

4.3.3.1 The grounding of the cabinet shall be treated with corrosion protection.

4.3.3.2 All exposed conductors, connectors, and terminal blocks shall be treated with corresponding anti-corrosion and moisture-proof treatment.

4.3.3.3 All exposed circuit boards and solder joints shall be treated with corresponding anti-corrosion and moisture-proof treatment.

4.3.3.4 The end of the connecting wire is marked with a loop label, which is clear, firm, complete, and non-marking. Symbols are required for different functional plug-ins To be distinguished, the plug-in should be supported by a guide rail and be able to be fixed firmly, and all the connection points should ensure reliable electrical contact and convenient plugging and unplugging.

4.3.3.5 The wiring inside the cabinet shall meet the requirements specified in Article 6.7 of the standard GB/T 3797-2016.

4.3.3.6 The wiring process and electrical connection in the cabinet should consider the influence of corrosion and condensation on the insulation surface on the creepage distance, and the impact of high humidity on the air The influence of the air insulation gap.

4.3.3.7 When multi-core cables are used in AC systems, magnetic materials should not be used for shielding.

4.3.3.8 When single-core cables need to be connected in parallel, the type, length, and end technology of the parallel cables should be the same.

4.3.3.9 Permanent anticorrosive non-magnetic clamps and brackets should be used for fixed cables.

4.3.3.10 Shielded cables or cables in metal pipes, shielded nets or metal pipes should be equipotentially connected, and should be equipotentially grounded.

4.3.4 Installation

4.3.4.1 The control cabinet should be installed with a shock-absorbing structure.

4.3.4.2 The inlet and outlet wires of the control cabinet shall be installed in accordance with the design requirements of the cabinet to ensure the corresponding protection level of the cabinet.

4.3.4.3 The incoming and outgoing wires of the control cabinet should be firmly fixed, and the shield end of the shielded wire and the pipe end of the cable sleeve should be reliably grounded.

4.4 Functional requirements

4.4.1 Signal acquisition and processing

The system should provide relevant data information collection and processing functions involved in control and fault monitoring, such as.

a) Environmental parameters. wind speed, wind direction, temperature, humidity;

b) Mechanical parameters. wind wheel speed, generator speed, yaw position, yaw speed, torsion cable angle, pitch angle, pitch speed Temperature, hydraulic system pressure, oil level, vibration acceleration, temperature (generator stator, bearing, gear box, etc.);

c) Electrical parameters. voltage, current, frequency, power, power factor, power generation, UPS status.

The main control system should have the collection and processing functions of the following parameters.

d) Hydrological parameters. wave height, ocean current speed, freezing, etc.;

e) Other parameters. smoke, insulation, etc.

The system should be able to output physical quantities that accurately reflect the state of the monitored unit according to reasonable safety algorithms, and improve the overall reliability of the system;

The collection method and accuracy should meet the requirements of wind turbine design requirements.

4.4.2 Information (human-computer interaction, fault, monitoring)

4.4.2.1 Data monitoring information

The main control system can collect or generate the following data information, and the main control system should be able to provide a data communication interface to satisfy the central monitoring The monitoring requirements of the system or other monitoring equipment. At least the following data should be provided.

a) Wind speed, wind direction, wind wheel speed, generator speed, nacelle position, yaw position, twisted cable angle, pitch angle;

b) The current status of the unit (standby, grid connection, shutdown, etc.);

c) Hydraulic system pressure, engine room vibration, engine room temperature and humidity, generator temperature, gear box oil temperature (optional), etc.;

d) Pitch system status, converter system status, UPS status, other actuators and sensor status;

e) Power grid and generator terminal electrical parameters (three-phase voltage, three-phase current, active power, reactive power, power factor, frequency Rate, power generation, etc.).

f) Encoder signal, main bearing signal, fuse signal, arrester signal, safety chain signal, control cabinet smoke alarm.

4.4.2.2 Fault record

The main control system shall be able to automatically record the specified recent fault information in the storage area of the local controller, and the retention time shall not be less than 6 months.

The resolution accuracy should be at least 100 ms in order to reproduce and analyze the fault afterwards.

4.4.2.3 Recalling the accident

Record the related quantities of various accidents for a short period of time, and save this record when an accident occurs. Accident recall record The length and sampling interval of the two periods before and after the accident should be adjustable. Generally, the sampling frequency of recalling and recording accidents is not less than 1 time per second, The recording time is not less than 120s, including. not less than 60s before the accident and not less than 30s after the accident.

4.4.2.4 Automatic clock correction

The main control system has a time calibration function, which regularly reads the network standard clock source to calibrate the controller time to ensure that all the power generation system The device clocks are consistent.

4.4.3 Human-computer interaction

4.4.3.1 The main control system should be equipped with a man-machine interface, and the unit control, unit status and parameter information can be browsed according to different user rights. Operations such as viewing, parameter setting and modification.

4.4.3.2 The controllable functions of the man-machine interface shall include. manual start and stop, yaw control, etc.

4.4.3.3 The status information that can be displayed on the man-machine interface should include. system status, hydraulic status, yaw status, wind status, temperature, humidity, Variable pitch status, I/O port status, vibration sensor status, speed status, power grid status, lubrication status, activated status code information, etc.

4.4.3.4 The engine room control cabinet should have a debugging interface.

4.4.4 Protection and safety

4.4.4.1 Fault protection

The system should be able to form a number of status codes that can reflect the operation failure of the unit according to the sensor collection and the operation requirements of the wind turbine.

The code should be able to locate fault information accurately, prevent misoperation, and be easy to maintain. When any one of the status codes is activated, the main control system shall be able to According to the status code attribute, the corresponding alarm or shutdown operation can be accurately made.

4.4.4.2 Communication watchdog

The main control system should be able to monitor the communication status between itself and each subsystem in real time, and form corresponding status codes in time when the communication is abnormal.

According to the shutdown program level corresponding to the status code, the alarm or shutdown process is executed.

4.4.4.3 Monitoring of key equipment

For key equipment such as generator rotor, generator stator, generator bearing, gearbox bearing (optional), anemometer, wind direction The main control system should monitor its correctness according to its characteristics to ensure that every physical quantity participating in the control can truly reflect the monitored device. The status of the device.

4.4.4.4 Protection function

The main control system should have at least the following protection functions. -Overcurrent protection; -Lack of phase protection; -Phase sequence error protection; -Grid voltage unbalance protection; -Ground fault protection; -Cooling system failure protection; -Hydraulic system failure protection; -Over temperature protection; -Over humidity protection; -Generator under, over speed, stall protection; -Over/under voltage protection; -Communication failure alarm; […]