LS Industrial Systems has recently entered the medium voltage drives market with the new product – LSMV. It is a cascaded multilevel H-bridge type inverter. Technical specifications of the drive are available below.
3MVA, 6600V LSMV Variable Frequency Drive
| LSMV |
| Topology |
Cascaded H-Bridge Multilevel Inverter |
| Input section |
Diode 18-pulse or 36-pulse rectifier |
| Input voltage |
3300V, 4160V, 6600V, 10000V |
| Efficiency |
97% at rated load |
| Input power quality |
18-pulse and 36-pulse meet IEEE 519 compliance; PF>0.95 for 20-100% load range, |
| DC link section |
each single-phase cell has its own capacitor |
| Output section |
series connected LV IGBT H-bridges |
| Converter power |
3300V drives: 200-3700kVA; 4160V drives: 250-4700kVA; 6600V drives: 400-7500kVA; 10000V drives: 600-11000kVA |
| Output voltage |
0-3300V, 0-4160V, 0-6600V, 0-10000V |
| Output frequency |
5-120Hz |
| Field weakening |
no data |
| Switching frequency |
no data |
| Output waveform |
voltage rating dependent |
| Motor type |
induction |
| Overload |
120% rated current for 1 min. |
| Cooling |
air-cooled |
| Control scheme |
V/f, sensorless vector control |
| Dynamic speed error |
no data |
| Steady-state speed error |
0.1% |
| Torque response time |
no data |
| Torque accuracy |
no data |
| Modulation technique |
phase-shifted or level-shifted modulation |
| Special features |
- |
Thank you to the LS Industrial Systems team for providing me reference materials.
References:
- Perfect Energy Saving Drive. LS Medium Voltage VFD
Posted
on August 31, 2009, 9:45 pm,
by Paweł Szymula,
under
Converteam.
Converteam opened a new rotating machines factory in Yantai, Shandong province. Medium voltage motors and generators will be manufactured there. The company plans also to run a medium voltage drives manufacturing plant in Shanghai and a joint-venture in Wuhan.
More information about the investments and management statements can be found in the company official press release.
Schneider Electric Altivar 1000 medium voltage drive:
| Altivar 1000 |
| Topology |
3-level Neutral Point Clamped Voltage Source Inverter |
| Input section |
Diode 12-pulse or 24-pulse or HV IGBT based 3L-NPC AFE |
| Input voltage |
2300V, 3300V |
| Efficiency |
99% at rated load for drives with diode rectifier (without input transformer), no data for active front end rectifier |
| Input power quality |
12-pulse IEEE 519 compliance – In/Isc ratio dependent, 24-pulse and AFE meets IEEE 519; PF>0.96 at rated load for diode rectifier, and PF>0.98 at rated load for AFE rectifier |
| DC link section |
common DC link capacitors |
| Output section |
HV IGBT based 3-level NPC voltage source inverter |
| Output power |
air-cooled 3300V drives: 1100-4500kW (1474-6032HP); water-cooled 3300V drives: 1300-11570kW (1742-15509HP) |
| Output voltage |
0-2300V; 0-3300V |
| Output frequency |
5-70Hz; extended 5-140Hz |
| Field weakening |
no data |
| Switching frequency |
no data |
| Output waveform |
5-level line-to-line voltage waveform |
| Motor type |
induction or synchronous as option |
| Overload |
110% rated current for 1 min. every 10 minutes or 150% rated current for 1 min. every 10 minutes |
| Cooling |
air-cooled and water-cooled |
| Control scheme |
V/f, flux vector control with and without encoder |
| Dynamic speed error |
no data |
| Steady-state speed error |
0.5% without encoder and 0.05% with encoder |
| Torque response time |
5ms |
| Torque accuracy |
no data |
| Modulation technique |
hysteresis modulation |
| Special features |
- |
References:
- Concentrated savings for your applications. Altivar 1000. Medium-voltage variable speed drive
