DEIF TCM-2 thyristor control module: Wind power cut in control engineering guide

Advantage:

Centralized control: Suitable for the coordinated control of multiple units in large wind farms, the upper level controller can uniformly allocate the power output of each unit according to the grid dispatch instructions.

Flexible Expansion: The CAN bus supports multi-point topology, and multiple TCM-2 modules can be mounted on the same bus for easy system expansion and standardized wiring.

Remote diagnosis: Through the CAN bus, the upper system can obtain real-time information on the working status, fault codes, and operating parameters of TCM-2, enabling remote monitoring and maintenance.

Core Technology: Adaptive Entry Strategy - Reducing Transmission Load

The most prominent technological advantage of TCM-2 lies in its innovative adaptive entry strategy. This strategy is fundamentally different from the traditional fixed curve approach, as it can dynamically optimize the climb curve of the trigger angle based on the current operating conditions.

1. Limitations of traditional entry methods

In traditional wind turbines, the cut in control usually adopts:

Fixed slope soft start: Increase the thyristor trigger angle at a preset constant rate to gradually increase the generator terminal voltage.

Direct grid connection: When the speed reaches the threshold, the generator is directly connected to the grid through a circuit breaker.

Both of these methods have obvious flaws:

A fixed slope cannot adapt to the random fluctuations of wind speed, which may result in longer cutting time (increased wear) at low wind speeds and excessive impact at high wind speeds.

Directly connecting to the grid will generate huge transient currents and torque shocks, causing significant stress on the gearbox and coupling.

2. Working principle of adaptive strategy

The adaptive entry strategy of TCM-2 dynamically adjusts the rise curve of the trigger angle by monitoring the electrical and mechanical state parameters of the generator in real time, such as speed change rate, voltage establishment rate, current response, etc. Its core algorithm can:

Proactively identifying the 'best entry window': After the generator speed reaches the entry threshold, TCM-2 does not immediately start soft starting, but evaluates the current speed acceleration and grid conditions to select the optimal entry starting time.

Dynamic slope adjustment: During the cutting process, the voltage rise rate is automatically adjusted based on real-time current feedback and torque estimation - slowing down when mechanical stress may exceed the limit and accelerating when conditions are favorable.

Reduce torque pulsation: By precise phase angle control, the torque matching degree of the generator at the moment of grid connection is maximized, significantly reducing torsional vibration on the transmission chain.

3. Comparison of measured performance

The manual cites comparative measurement data with similar products in the market (illustrated):

Conventional entry method: Significant current spikes and torque oscillations will occur at the moment of entry, with peaks reaching 2-3 times the rated value.

TCM-2 adaptive cut in: The current and torque curves rise smoothly without obvious peak impact, and the load on the transmission system is significantly reduced.

This difference has profound implications for the long-term operation of wind farms - reducing the load on the transmission system is directly equivalent to extending the service life of gearboxes, main bearings, and couplings, reducing unplanned downtime and maintenance costs.

CAN bus communication: building an efficient control network

The CAN bus interface equipped on TCM-2 is the key to its operation as a slave mode.

1. Communication characteristics

Protocol compatibility: Supports standard CAN 2.0A/2.0B protocols and can be easily connected to mainstream PLCs (such as Beckhoff, B&R, Siemens) or dedicated wind power control systems.

Real time performance: The high priority arbitration mechanism of the CAN bus ensures that control instructions can be delivered to TCM-2 with microsecond level delay, meeting the real-time requirements of wind power control.

Anti interference capability: differential signal transmission and CRC verification mechanism enable reliable communication even in cabin environments filled with frequency converter harmonics and electromagnetic interference.

2. Typical communication content

In slave mode, TCM-2 exchanges the following data through the CAN bus:

Issuing instructions: trigger angle setting value, run/stop command, switch in enable, parameter modification command, etc.

Upload status: current trigger angle, module temperature, fault code, operating mode, thyristor status diagnosis, etc.

Engineering Application and Deployment Suggestions

1. Applicable scenarios

Double fed asynchronous generator (DFIG) rotor side converter: achieving flexible grid connection and power regulation on the rotor side.

Permanent magnet synchronous generator (PMSG) full power converter: thyristor rectification control is implemented on the generator side.

Wind power renovation project: Replace old control modules to improve smoothness of entry and system reliability.