ConvertCurrent Control Config Attrib

These are the current control configuration attributes for the Regenerative Converter.

Converter Current Loop Bandwidth

The Converter Current Loop Bandwidth attribute is the AC Line Current Loop Proportional Gain value that multiplies the active and reactive AC Line Current Error signals. This value directly determines the bandwidth of the active and reactive AC line current loops.

Converter Current Integrator Bandwidth

The Converter Current Integrator Bandwidth attribute is the AC Line Current Loop Integral Gain value that, together with Kcp, multiplies the active and reactive AC Line Current Error signals before applying them to the active and reactive AC Line Current Integrator Error accumulators. This value represents the bandwidth of the velocity integrator beyond which the integrator is ineffective. A value of 0 for this attribute disables the integrators.

Converter Current Vector Limit

The Converter Current Vector Limit attribute sets the value applied to converter current vector limiter to provide a configurable limit to the magnitude of the converter's active and reactive current reference signals.

Converter Current Loop Tuning Method

Use the Converter Current Loop Tuning Method attribute to configure the responsiveness of the active and reactive current loops.

With the Direct method, the current loop response is determined directly by the Converter Current Integrator Bandwidth value that maps to the integral gain, Kci, of the converter’s current loop. When configured for the Direct tuning method, the Converter Current Loop Damping attribute value has no effect on the current control loops.

With the Calculated method, the loop response is determined by the Converter Current Loop Damping value. The converter uses this value to calculate the appropriate internal current loop integral gain, Kci, based on the Converter Current Loop Bandwidth and known load characteristics of the AC Line. When configured for the Calculated tuning method, the Converter Current Loop Integrator Bandwidth attribute value has no effect on the current control loops.

Converter Current Loop Damping

The Converter Current Loop Damping attribute is the Damping factor that, together with the specified Converter Current Loop Bandwidth value, determines responsiveness of the active and reactive AC line current loops. This attribute may be used as an alternative to directly setting the Kci gain value for the current loops. A damping factor of 1 results in a critically damped current loop.

Keff

The Keff attribute is the AC Line Current Power Feedforward Gain value that multiplies the inverter’s Output Power signal to form a feedforward signal that is applied to the line-side current control loop of the regenerative converter. A value of 100% Converter Power Feedforward applies the inverter’s full Output Power signal to the converter’s current control loop. A value of 0 disables the Converter Power Feedforward function.

This attribute is only applicable to integrated drive devices that include a regenerative converter and one or more inverters.