I. Introduction to the Doubly-Fed Variable-Frequency Electric Control System
The doubly-fed variable-frequency electric control system is a high-performance speed-regulation solution specifically developed for high-power motor-drive applications, widely used in industrial fields such as wind power generation, mine hoisting systems, and pump/fan operations. The system employs dual-PWM converter technology, enabling precise control of motor speed and bidirectional energy flow. It offers a speed-control range of up to ±30% of the rated speed, delivering comprehensive energy-saving benefits ranging from 20% to 40%.
II. System Components
1. Core Components
Component Name, Technical Features, Performance Metrics
Doubly Fed Motor with a Special Wound Rotor Design Power Range: 0.5–10 MW
Rotor-side converter IGBT module, vector control algorithm. Overload capacity: 150% for 60 seconds.
Grid-side converter active front-end design, unit power factor, THD < 3%.
Control system with DSP + FPGA architecture, providing real-time control. Control cycle: 100 μs
2. Auxiliary System
Cooling System: Forced Air Cooling/Water Cooling Optional
Protection System: Multiple protections including overvoltage, undervoltage, and overcurrent.
Monitoring System: Touchscreen + Remote Monitoring Interface
III. Core Technologies
1. Intelligent Speed Control
Vector Control Technology Based on Flux Orientation
Rotational speed control accuracy: ±0.1%
Torque response time <10ms
2. Energy Regeneration Technology
Four-quadrant operation capability
Efficiency >96%
Power Grid Harmonic Suppression
3. Intelligent Diagnostic Function
IGBT Health Status Monitoring
Bearing Vibration Analysis
Insulation Aging Warning
Core Technology Features
High-efficiency speed control performance
Wide speed regulation range (0–120% of rated speed)
Fast dynamic response (torque response <10ms)
High rotational speed accuracy (±0.1%)
Outstanding energy-saving performance
Reactive Power Self-Compensation
Low rotational speed, high efficiency (with a wide efficiency range exceeding 85%)
Energy Feedback to the Grid (Regenerative Braking)
Intelligent Control Function
Torque/Speed Dual Closed-Loop Control
Grid Fault Ride-Through Capability
Remote Monitoring and Diagnosis
IV. Performance Advantages
High Efficiency and Energy Saving: System Efficiency > 95%
Precise Control: Speed Fluctuation <0.2%
Reliable and Durable: MTBF > 50,000 Hours
Intelligent Operations & Maintenance: Enabling Predictive Maintenance
V. Application Areas
Industrial drives, mine hoists, large-scale water pumps, and compressor drives
Keywords
Previous: Local System Upgrade
Doubly-Fed Variable-Frequency Electric Control System
Contact Information
Product Categories
Related Products
Related Products
Ball mill
Ball mill
Rod Mill
(Semi) Autogenous Mill
Mining Hoisting
Single-rope Winding Mine Hoist
Multi-rope friction mine hoist
Well Drilling Hoist
Supporting Equipment
Mining Washing and Selection
Selective Crusher
Centrifuge
-
WLL Series Coal Slime Scraper Discharge Centrifugal Dehydrator
-
WZY Series Dual-Mass Horizontal Vibrating Centrifugal Dehydrator
-
WZL Series Horizontal Vibrating Centrifugal Dehydrator
-
TWZ Series Horizontal Vibrating Centrifugal Dehydrator
-
LLS-900 Sludge Centrifugal Dehydrator
-
ML Series Coal Slurry Centrifugal Dewatering Machine
-
LL Series Vertical Centrifugal Dehydrator
Flotation machine
Filter machine
Grading Machine
Mining Auxiliary Equipment
Gear Reducer Series
-
Vertical mill gearbox
-
Special reducer for scraper machine
-
Industry-specific gear reducer
-
Bevel Gear Reducer
-
Cylindrical Gear Reducer
-
Planetary Gear Reducer
-
Parallel shaft reducer
-
Industrial General Gearbox Series
-
Helical Gear - Bevel Gear Reduction Motor
-
Helical Gear Reduction Motor
-
Planetary Gear Reducer
-
Cylindrical Gear Reducer
Category One
Category Two
Crusher Series
Rotary Crusher
Jaw Crusher
Impact Crusher
Cone Crusher
Ball Press Machine
High-pressure briquetting machine
Medium and High Pressure Briquetting Machine
Rotary kiln
-
Cement kiln (rotary kiln)
-
Light gray kiln (self-alkali steam calcination kiln)
-
Chemical kiln
-
Oxidation Cooling Kiln
-
Oxidative roasting rotary kiln (oxidation kiln)
-
Lithium Carbonate Rotary Kiln
-
Lime Rotary Kiln
-
Metal Magnesium Rotary Kiln
-
Architectural Lightweight Aggregate Rotary Kiln
-
Cement Rotary Kiln
Cast and forged parts
Large castings
Large Forgings
Transmission Accessories
Gear Coupling
Gear
Electro-hydraulic control system
Automation Control
-
GPRS Remote Expert Diagnostic System
-
Metallurgical Electrical Control Equipment
-
Automated Control System for Mineral Processing and Coal Washing
-
Local System Upgrade
-
Doubly-Fed Variable-Frequency Electric Control System
-
Fully digital DC control system
-
Fully digital low-voltage variable frequency feedback
-
Disc Brake Online Inspection System
-
Rotary Kiln Control System
Hydraulic System
-
Hydraulic System
-
Hydraulic System
-
Hydraulic System
-
Hydraulic System
-
Hydraulic System
-
Hydraulic system
-
Hydraulic system
-
Hydraulic System
-
Hydraulic System
-
Hydraulic Station
-
Variable-frequency servo hydraulic system
-
E119A/E119S, E118A/E118S Explosion-Proof Secondary Brake Hydraulic Station
-
Constant-Deceleration Electro-Hydraulic Braking Control System
-
TE160/TE161/TE162/TE163 Insert-Mounted Control Dual-Stage Braking Hydraulic Station
Hydraulic cylinder
Other accessories
Large welded components
-
Large kiln body riveted and welded components
-
Large furnace riveted and welded components
-
Large Riveted and Welded Components
-
Large Riveted and Welded Components
-
Large Riveted and Welded Components
-
Large steel ladle riveted and welded components
-
Large base
-
Large Riveted and Welded Components
-
Ball Mill Cylinder
Wear-resistant products
-
Eccentric Crusher Jaw Plate
-
New-Type High-Pressure Roller Wear-Resistant Surfacing Welding Technology
-
Bus Alloy Bushings
-
Large ball mill ZGMN13CR2 lining plate
-
Medium-chromium alloy liner plate
-
High-manganese steel product series
-
High-precision cast iron parts
-
Low-carbon martensitic steel jaw plate
-
Large Self-Grinding Mill Cylinder Lining Plates
Engineering Plastics
-
Modified PP sheave and guide wheel lining blocks for elevators
-
Nylon products
-
Polyurethane Products
-
Multi-rope hoist phenolic press blocks, fixing blocks
-
Germany-imported — LUWIPLAST GELB848 Friction Pads
-
Single-rope mine hoist plastic lining板
-
WSM-3 New Eco-Friendly, Non-Asbestos Brake Blocks (Elevator Braking System)
-
KP-09 Ultra-High Molecular Wheel Sheave Lining Pads
-
GDM326 Imported Material High-Performance Friction Pads
Roller shaft
crane sheave
Contact Us
No.99 Hengshan Road, Jianxi District, Luoyang City, Henan Province
sweep
CITICTLC
Learn more about dynamic information