CPS IGBT Boost Rectifier

In VDC mode, the CPS accepts DC voltage commands with a 10Hz (100ms) update rate. When running VDC mode, the system will accept commands within the range of high and low DC Voltage limits. In VDC mode the CPS attempts to control the DC input voltage to the Voltage setpoint by alternatively injecting or absorbing power to or from the grid. In such case that the maximum allowed kVA is exceeded, the CPS will curtail operation to the maximum allowed kVA and current limits.

The CPS can accept active and reactive power commands in percentage of nominal rating. By default, when the issued active and reactive power exceeds the maximum VA rating, the CPS will prioritize active power over reactive power. This means user issued active power command is prioritized first over reactive power, and only if this is less than 100% VA rating, then the CPS will output reactive power up to the max rating. This priority of active power can be inverted and set to reactive power priority.

The rectifier can ramp its output active and reactive power via a Normal Ramp Rate or Soft Start Ramp Rate. Normal Ramp Rate is always active and applies to normal ramping of output power with a preset value. Soft Start Ramp Rate, when enabled, is activated after initial connection to the grid, or reconnection after auto transfer, or power restoration after momentary cessation. When active, this functionality limits the ramp rate of the output power to a slower defined value.