Doubly-fed variable frequency electric control system
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  • Doubly-fed variable frequency electric control system

1. Introduction to Doubly-Fed Variable Frequency Electric Control System

The doubly-fed variable frequency electric control system is a high-performance speed regulation solution developed specifically for high-power motor drive applications. It is widely used in industrial fields such as wind power generation, mine hoisting, and water pump fans. The system adopts dual PWM converter technology to achieve precise motor speed control and bidirectional energy flow, with a speed regulation range of ±30% of the rated speed and an overall energy-saving effect of 20%-40%.

2. System Composition

1. Core Components

Component Name Technical Features Performance Indicators

Doubly-fed Motor Special Wound Rotor Design Power Range: 0.5-10MW

Rotor-side Converter IGBT Modules, Vector Control Algorithm Overload Capacity: 150% for 60s

Grid-side Converter Active Front End Design, Unity Power Factor THD<3%

Control System DSP+FPGA Architecture, Real-time Control Control Cycle: 100μs

2. Auxiliary Systems

Cooling System: Forced Air Cooling/Water Cooling Optional

Protection System: Multiple Protections Including Overvoltage, Undervoltage, Overcurrent

Monitoring System: Touch Screen + Remote Monitoring Interface

3. Core Technologies

1. Intelligent Speed Control

Vector Control Technology Based on Flux Orientation

Speed Control Accuracy ±0.1%

Torque Response Time <10ms

2. Energy Feedback Technology

Four-Quadrant Operation Capability

Feedback Efficiency >96%

Grid Harmonic Suppression

3. Intelligent Diagnostic Functions

IGBT Health Status Monitoring

Bearing Vibration Analysis

Insulation Aging Early Warning

Core Technical Features

High-Efficiency Speed Regulation Performance

Wide Speed Regulation Range (0-120% Rated Speed)

Fast Dynamic Response (Torque Response <10ms)

High Speed Accuracy (±0.1%)

Excellent Energy Saving Effect

Reactive Power Self-Compensation

High Efficiency at Low Speed (Efficiency Zone Above 85%)

Energy Feedback to Grid (Regenerative Braking)

Intelligent Control Functions

Torque/Speed Dual Closed-Loop Control

Grid Fault Ride-Through Capability

Remote Monitoring and Diagnostics

4. Performance Advantages

High Efficiency and Energy Saving: System Efficiency >95%

Precise Control: Speed Fluctuation <0.2%

Reliable and Durable: MTBF >50,000 Hours

Intelligent Operation and Maintenance: Supports Predictive Maintenance

5. Application Fields

Industrial Drives, Mine Hoists, Large Water Pumps, Compressor Drives

Keywords

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Doubly-fed variable frequency electric control system
+
  • Doubly-fed variable frequency electric control system

Doubly-fed variable frequency electric control system

The doubly-fed variable frequency electric control system is a high-performance speed regulation solution developed specifically for high-power motor drive applications. It is widely used in industrial fields such as wind power generation, mine hoisting, and water pump fans. The system uses dual PWM conversion technology to achieve precise motor speed control and bidirectional energy flow.

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