The ZINVERT Intelligent High-Voltage Variable Frequency Drive (VFD) System is a next-generation high-to-high voltage source inverter independently developed by Guangzhou Zhiguang Electric Co., Ltd. (SZSE listed, stock code: 002169). Built on a cascaded power unit topology with phase-shifted SPWM control, the ZINVERT series delivers 3kV, 6kV, and 10kV output voltage directly — without a step-down output transformer — enabling precise variable-speed control of high-voltage AC motors across a broad operating range.
Overview Features Technical Parameter Downloads
By replacing conventional throttle valve regulation and hydraulic coupling speed control, the ZINVERT system eliminates throttling losses at the source. Average energy savings of over 20% have been demonstrated at rated operating conditions, making it one of the most cost-effective solutions for energy-intensive industries such as power generation, metallurgy, petrochemicals, and mining. The system is compatible with induction motors, synchronous motors, and permanent magnet motors, and provides accurate real-time tracking of grid voltage phase, frequency, and magnitude to minimize grid disturbances during acceleration, deceleration, and steady-state operation.The fully digital control architecture centers on dual motor-control DSPs, high-density CPLD and FPGA processors, and integrated PLC logic — all interconnected via high-speed fiber-optic communication links. Phase-shifted SPWM waveforms from each cascaded power unit are superimposed to produce a near-perfect sinusoidal output, substantially reducing harmonic content and voltage dv/dt. The result is a "zero-harmonic" output that protects motor insulation and eliminates the need for additional output filters.
A key reliability feature is the automatic power unit bypass: if any individual unit develops a fault, the system automatically bypasses it without operator intervention, allowing the remaining units in each phase to continue operating — typically without load derating. An automatic line-frequency bypass further ensures that, in the event of a drive fault, the motor can be instantly switched back to direct grid connection, keeping critical processes running without interruption.
With over 16,000 systems in service across China and in more than 40 countries worldwide, ZINVERT represents a proven, high-availability platform for motor speed control and industrial energy saving. Flagship applications include 300MW–600MW thermal power feedwater pump drives, 600MW+ combined induced draft fan drives, and extra-large capacity sintering main exhauster drives for the steel industry — positioning ZINVERT as a direct competitor to leading international brands in ultra-high-capacity applications.
HVFD Eight Advantages
1.Superior high and low voltage ride-through technology
It does not shut down in the range of 65% to 115% Ue fluctuation of the grid-side voltage, and within 60s of the grid-side voltage dropout, it starts by itself without.
2.Direct starting of rotating loads with proprietary "STT" technology.
Adopting the original "STT" algorithm, it ensures that the motor can be started without stopping at any speed within the speed range, and can be started directly without impact, which has been verified through testing by national institutions.
3.High-voltage output sudden short-circuit "SCP" protection technology.
Adopting the patented "SPC" protection technology with multiple short-circuit protection functions, it can effectively protect the safety of the motor and the system.
4.Separate power supply technology for transformers with high short-circuit insulation impedance
Low-voltage debugging mode enables convenient debugging and easy problem troubleshooting, shortens the debugging cycle, and improves reliability.
5.Adaptive acceleration and deceleration adjustment
Improve the short-circuit resistance of the transformer, guarantee the stability of the power supply of the unit, reduce the losses generated by daily operation, and save energy and increase efficiency.
6.Unique cooling structure adapts to air-cooled and water-cooled flexible design
Adopting special structural design, high heat dissipation efficiency, small system volume, low requirements for temperature, humidity, dust, gas and other environmental requirements, air-cooled, water-cooled to meet the needs of customers in multiple scenarios.
7.Low power sensitivity and high operational stability
Adopt three-way power supply circuit design, low sensitivity to power supply. Adopt software and hardware multiple anti-interference technology to ensure the stability of system operation.
8.Fully In-House R&D and Manufacturing Ensure Quality and Cost Competitiveness
Leveraging Zhiguang’s extensive experience in high-power power electronics and patented technologies, we independently research and manufacture core components—such as power units, phase-shifting transformers, and control systems—thereby guaranteeing both product quality and cost advantages.
1.Superior high and low voltage ride-through technology
It does not shut down in the range of 65% to 115% Ue fluctuation of the grid-side voltage, and within 60s of the grid-side voltage dropout, it starts by itself without.
2.Direct starting of rotating loads with proprietary "STT" technology.
Adopting the original "STT" algorithm, it ensures that the motor can be started without stopping at any speed within the speed range, and can be started directly without impact, which has been verified through testing by national institutions.
3.High-voltage output sudden short-circuit "SCP" protection technology.
Adopting the patented "SPC" protection technology with multiple short-circuit protection functions, it can effectively protect the safety of the motor and the system.
4.Separate power supply technology for transformers with high short-circuit insulation impedance
Low-voltage debugging mode enables convenient debugging and easy problem troubleshooting, shortens the debugging cycle, and improves reliability.
5.Adaptive acceleration and deceleration adjustment
Improve the short-circuit resistance of the transformer, guarantee the stability of the power supply of the unit, reduce the losses generated by daily operation, and save energy and increase efficiency.
6.Unique cooling structure adapts to air-cooled and water-cooled flexible design
Adopting special structural design, high heat dissipation efficiency, small system volume, low requirements for temperature, humidity, dust, gas and other environmental requirements, air-cooled, water-cooled to meet the needs of customers in multiple scenarios.
7.Low power sensitivity and high operational stability
Adopt three-way power supply circuit design, low sensitivity to power supply. Adopt software and hardware multiple anti-interference technology to ensure the stability of system operation.
8.Fully In-House R&D and Manufacturing Ensure Quality and Cost Competitiveness
Leveraging Zhiguang’s extensive experience in high-power power electronics and patented technologies, we independently research and manufacture core components—such as power units, phase-shifting transformers, and control systems—thereby guaranteeing both product quality and cost advantages.
Technical Parameter
voltage level：2.3kV， ，，，，，3kV， ，，，，，3.3kV， ，，，，，6kV， ，，，，，6.6kV， ，，，，，10kV
Input:
Phases、Frequency: Three-phase, 50/60±5%Hz
Voltage range: (Normal operating rating) / -15%~35% (Reduced rate)
power factor: >0.96 (>20% load)
Output：
Overload capacity： 130% In 1 min/10 min; 180% In immediate protection;
Voltage：0~Un (rated voltage), carrier phase-shifted superimposed waveform ；；；；；；
Frequency：0~50Hz/60Hz
Current Harmonics (THD): <2% (rated power)
voltage level：2.3kV， ，，，，，3kV， ，，，，，3.3kV， ，，，，，6kV， ，，，，，6.6kV， ，，，，，10kV
Input:
Phases、Frequency: Three-phase, 50/60±5%Hz
Voltage range: (Normal operating rating) / -15%~35% (Reduced rate)
power factor: >0.96 (>20% load)
Output：
Overload capacity： 130% In 1 min/10 min; 180% In immediate protection;
Voltage：0~Un (rated voltage), carrier phase-shifted superimposed waveform ；；；；；；
Frequency：0~50Hz/60Hz
Current Harmonics (THD): <2% (rated power)