ZF-BP Series Vector Control High Voltage Variable Frequency Drive
Vector control high-voltage VFD is a high-voltage power conversion equipment based on vector control technology, widely used in the industrial field. By accurately controlling the torque and magnetic flux of the motor, it achieves efficient and stable operation.
Working Principle
- Vector Control
The core of vector control is to decompose the stator current of an AC motor into torque and magnetic flux components, and achieve decoupling control of motor torque and magnetic flux by independently controlling these two components. This control method enables AC motors to have dynamic performance similar to DC motors, significantly improving speed regulation accuracy and response speed.
- Coordinate Transformation
By using Clarke transform and Park transform, the current in the three-phase stationary coordinate system is converted into the DC component in the two-phase rotating coordinate system, simplifying the control algorithm and improving control accuracy.
- Closed Loop
By combining speed sensors (such as encoders) or sensorless technology, real-time feedback of motor operating status is provided to form a closed-loop control system, ensuring precise control of output torque and speed.
Characteristic
- High Voltage Level
Suitable for high voltage power grids such as 3kV, 6kV, 10kV, etc., it directly drives high voltage motors, reduces intermediate links such as transformers, and lowers system losses.
- High Power Capacity
The power range typically ranges from several hundred kilowatts to tens of megawatts, meeting the driving needs of large industrial equipment such as fans, pumps, and compressors.
- High Reliability
Adopting multiple PWM technologies, redundant design, and intelligent protection functions to ensure stable operation in harsh industrial environments.
- Efficient and Rnergy-saving
By precisely controlling the motor speed and torque, the phenomenon of "big horse pulling small car" is avoided, and the energy-saving effect is significant, especially in variable load applications such as fans and water pumps.
Technical Advantages
- Fast dynamic response
Vector control technology reduces the torque response time of motors to several tens of milliseconds, meeting high dynamic performance requirements.
- Wide speed range
It can achieve stepless speed regulation from 0 to 100% of rated speed, adapting to different working conditions.
- Superior low-speed performance
When running at low speeds, it can still maintain high torque output, avoiding the torque ripple problem of traditional frequency converters in the low-speed range.
- Four quadrant operation
Supports both electric and power generation modes, suitable for occasions that require energy feedback (such as downhill transportation, centrifuges).
