VVVF — traction inverters (converters) on IGBT/SiC for electric trains, metro, trams and electric locomotives, 600–1500 V DC
VVVF traction converters (variable voltage and variable frequency) control the asynchronous traction motors of electric trains and are distinguished by high reliability, maintainability and energy efficiency.
- Circuit
- two-level inverter on high-voltage IGBT or SiC modules; dry capacitors
- Control
- sensorless vector; individual or group motor control
- Cooling
- natural or forced air
- Example 1
- 1500 V DC, 1C4M × 2 groups, 4 motors of 140 kW per group, underfloor, long common housing
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
VVVF traction converters (variable voltage and variable frequency) control the asynchronous traction motors of electric trains and are distinguished by high reliability, maintainability and energy efficiency. They are used on suburban trains and in metro, on trams, in automated people mover (APM) systems and on high-speed ground transport, as well as on electric locomotives. The power section is built in a two-level scheme on IGBT modules with low losses and high permissible voltage, or on silicon carbide (SiC) modules; the use of dry capacitors and a simple configuration reduces dimensions and mass and increases reliability. In 2024 the company conducted trial operation of a VVVF inverter with fully SiC modules on rolling stock. Sensorless vector control minimizes wheel slip and skid, simplifies the system and ensures smooth running. Depending on the train composition and the required redundancy, individual control of each motor or group parallel control is chosen. The cooling method (natural or forced air) and the housing shape (long common housing, or housing with an integrated circuit breaker) are selected according to the installation place. The built-in IoT terminal makes it possible to monitor the condition of the equipment and set condition-based maintenance (CBM) requirements without an onboard information system. Examples from the catalogue: an underfloor inverter with natural cooling for 1500 V DC urban lines, in a long common housing for two groups of the 1C4M scheme, with four 140 kW motors in each; a 1500 V inverter with a built-in line breaker for one 1C4M group of four 190 kW motors; a roof-mounted inverter with forced cooling for a low-floor 600 V DC tram in the 1C2M scheme, with two 100 kW motors, with built-in fast-acting circuit breaker, line contactors, filter reactor and braking chopper. Service life and maintainability are optimized to reduce life-cycle cost. The inverters are supplied complete with the manufacturer’s traction motors, gearboxes and pantographs. For the modernization of Ukrainian multiple-unit rolling stock and trams this is a direct analog of traction converters.
Technical specifications
| Circuit | two-level inverter on high-voltage IGBT or SiC modules; dry capacitors |
|---|---|
| Control | sensorless vector; individual or group motor control |
| Cooling | natural or forced air |
| Example 1 | 1500 V DC, 1C4M × 2 groups, 4 motors of 140 kW per group, underfloor, long common housing |
| Example 2 | 1500 V DC, 1C4M, 4 motors of 190 kW, housing with built-in line breaker |
| Example 3 | 600 V DC (low-floor tram), 1C2M, 2 motors of 100 kW, roof-mounted, with built-in fast-acting breaker, line contactors, filter reactor and braking chopper |
| Monitoring | built-in IoT terminal for CBM |
| Application | suburban trains, metro, trams, APM, electric locomotives |
Request a price and lead time
VVVF — traction inverters (converters) on IGBT/SiC for electric trains, metro, trams and electric locomotives, 600–1500 V DC. We reply within one business day.
Or email sales@usk.ua or call 044 339-50-20.
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