TH—HVF Series High-Voltage Frequency InverterAdopting advanced power unit series stacking technology, vector control technology, and optimized PWM control algorithm, it converts 50Hz (60Hz) grid voltage into variable frequency and variable voltage sinusoidal voltage and current output of 0-50Hz (60Hz), adjusting motor speed to meet users' urgent needs for speed regulation and energy saving of fans and pumps, and improving production processes. This speed control system is suitable for various general-purpose AC motors and has been successfully applied in various industries of the national economy, providing users with comprehensive high-voltage (synchronous, asynchronous) AC motor soft start, speed regulation, energy saving, and intelligent control solutions. The system adopts an integrated design concept, mainly consisting of a phase-shifting transformer cabinet, power unit cabinet, control cabinet, and bypass (optional).
1. Voltage source type high-high inverter, input adopts phase-shifting transformer, unit series phase-shifting direct high-voltage output, no output step-up transformer needed, many output levels, very small dv/dt.
2. Thorough high-low voltage isolation design concept, the unit main circuit and controller are connected with high-quality optical fiber, the system has extremely high safety and good anti-electromagnetic interference capability.
3. Within 20% to 100% load variation, power factor reaches or exceeds 0.95, and current harmonics are low, no need for power compensation and harmonic suppression devices.
4. Without filters, the inverter can output sinusoidal current and voltage waveforms, the output waveform will not cause motor resonance, torque ripple is less than 0.1%, can reduce fan surging phenomenon, and the inverter has resonance point frequency jump function. No special requirements for the motor, no need for derating.
5. With V/F control and vector control modes, no impact on motor torque characteristics, no additional loss to the motor, greatly improves starting performance, high starting torque with low starting current, eliminates damage to current caused by starting, and eliminates impact on the power grid due to excessive starting current.
6. Interface can be hard-wired or communication; besides system settings, interface status information provides user-defined output interfaces (users only need to set the corresponding I/O output content on the human-machine interface).
7. Unique air duct design, the equipment can operate reliably at room temperature of 40°C. Top heat dissipation method for easy maintenance. Fans are imported products, durable.
8. Friendly human-machine interface uses touch screen, all Chinese interface; all operations are input via buttons or DCS interface to avoid touch screen misoperation; real-time alarm recording, accurate alarm positioning and historical record storage.
9. Communication between units and control part uses optical fiber; hot standby design of units; main circuit of units uses all imported devices, all main circuit devices rated operating parameters ≥ 2 times actual operation; transformer temperature rise class H, configured with bottom and top cooling fans.
10. High efficiency, high power factor, overall efficiency ≥ 98%, power factor > 95%.
11. Wide voltage input range: input voltage 65% to 130%, frequency fluctuation 45-55Hz, the equipment can work normally.
12. With local monitoring and remote monitoring modes, supports Profibus, Modbus, TCP/IP and other communication protocols; in local monitoring mode, through the touch screen display on the inverter, manual start/stop of the inverter can be performed locally, and speed and frequency can be adjusted.
13. With reverse start and flying start functions, regardless of whether the motor is rotating forward or reverse, the inverter can achieve high torque direct start, with instantaneous power failure restart function, no stop during power failure, 3-20S settable, automatically tracks current speed after grid recovery.
14. Main control circuit and control circuit are designed with dual power supply switching, one from user control power supply, the other from high-voltage input isolation transformer, dual circuit automatic switching time at ms level.
15. The design fully considers the impact of switching overvoltage and lightning overvoltage on equipment, different treatment measures are adopted for different overvoltages in main circuit and control circuit to improve equipment reliability. Perfect fault detection current, precise fault alarm protection, fully meet the needs of the inverter and the entire operating system.
16. Manual knife switch cabinet and automatic cabinet can be configured according to different user requirements, the control program includes control of the automatic cabinet, no need to modify the program.
17. Reliable redundant unit design, users can optionally configure I unit redundancy, in this configuration, it can ensure that when 3 units fail, the inverter can output at full load 50Hz.
18. Inverter fault classification protection, can operate with fault, achieving maximum uninterrupted operation.
19. Using multi-level technology, reducing harmonic amplitude through multiple superposition, pure harmonic-free input has no interference to the power grid; users do not need to consider expensive harmonic filters and related resonance problems caused by grid parameters. Output current harmonic distortion < 2%, harmonics generated by the variable frequency speed control system meet and exceed the provisions of the power quality public grid EEE519 international standard.
20. Line voltage automatic balancing technology: after a unit fault in the inverter, to balance the line voltage, the line voltage automatic balancing technology adjusts the angle between phases, ensuring large balanced line voltage output under the premise of large and unequal phase voltage output.
