Inverter DC cabinet current

Depending on the AC voltage. The 100kW, 690V AC-DC converter cabinet is a non-isolated high-power solution that operates at a maximum power of 100kW at 690V AC. With an operational voltage range from a minimum of 400 ph-ph V AC rms to a maximum of 690 ph-ph V AC rms, and a maximum current capacity of 80 A AC phase current on AC side.

The inverter starts as soon as the DC bus voltage is present at a greater level than 10% of the AC maximum. Observe the controlled AC voltage waveform on the output. The frequency and the amplitude of the AC voltage is determined by the values on the powerSUITE page of the solution. If any changes are required, stop the inverter.

Voltage source inverters (VSIs) are commonly used in uninterruptible power supplies (UPS) to generate a regulated AC voltage at the output. Control design of such inverter is challenging because of the unknown nature of load that can be connected to the output of the inverter.

Set up the hardware as outlined in Figure 16. On the powerSUITE page, select Closed Voltage and Current Loop under Project Options. Select AC for output. Select SDFM for sensing if available on the design. Enter 60 Hz for frequency for the AC waveform. This will be the frequency of the inverter output.

Key System Specifications A typical inverter comprises of a full bridge that is constructed with four switches, which can be modulated using pulse width modulation (PWM), and a filter for the high-frequency switching of the bridge, as shown in Figure 1. An inductor capacitor (LC) output filter is used on this reference design.

For the voltage source inverter, TI recommends to keep the crossover of the inner current loop at greater than ten times the AC frequency, which is met by this compensator, and no changes are needed in the design. If an adapted solution is not met, the compensator must be changed to ensure the crossover of the current loop meets this requirement.