Using three-level pulse-width modulation (PWM) control with output voltage at 800 V AC, we have achieved a single unit rated capacity of 1200 kVA, and have also drastically reduced the output current harmonics.
We have adopted a Insulated Gate Bipolar Transistor (IGBT) device configuration for a faster control response, lower loss and more simplified inverter control circuit.
High-efficiency plant operations can be achieved by exchanging power energy and regenerative energy with the DC distribution system over a common DC bus.
While the control unit is in operation or stopped it is possible to check various data and status conditions, which makes it extremely easy to review the system operating state including safeguard and abnormal conditions. Traceback functions* are also available during operation which are useful for troubleshooting the cause in the event of an abnormality. Additionally, analog output* of internal data is available during operation, enabling easy maintenance and inspections. * Traceback and analog output of internal data are optional features.
|Output||Voltage||Three-phase 800 VAC|
|Overload||1 min. at 150%|
|Control||Control method||Sine wave three-level PWM, ASR control with ACR minor control|
|Speed control range||1：1000|
|Speed control accuracy||±0.01% of rated speed|
|Field control range||1：3，1：4 ＊|
|Torque control accuracy||±5%，±3% ＊(when using VMT4)|
|Response speed||30rad/s (5Hz)
90rad/s ＊(15Hz，Hz, when using observer control)