Page Content

1 Page Content
2 Mask and Parameters
- 2.1 Parameters Tab
- 2.2 Filters Tab
- 2.3 PLL Tab
3 Inputs, Outputs, and Signals Available for Monitoring
- 3.1 Inputs
- 3.2 Outputs
4 Limitations
5 Intellectual Property Disclaimer

The Signal Conditioning Block generates the measured and conditioned values required by the Smart Inverter Control Toolbox blocks. For the grid support functions, the voltage reference can be generated as either average of three-phase RMS values or the positive sequence. The low pass filter time constant can be set for both power and DC link voltage measurement. A phase-locked loop (PLL) is implemented to obtain the frequency and instantaneous voltage angle information of the AC grid. Also, the PLL reference angle is used to perform the transformation of the voltages and currents in the ABC frame to a rectangular synchronous reference frame.

Mask and Parameters

The Signal Conditioning block contains the following tabs in the parameter configuration mask:

Parameters
Filters
PLL

Parameters Tab

Name	Description	Unit

Name	Description	Unit
Nominal Operating Voltage (Vrms LL)	The nominal inverter output line to line RMS voltage	V
Nominal DC-Link Voltage	The nominal value of DC-link voltage	V
Nominal Frequency	System frequency	Hz
Rated Apparent Power	Inverter nominal three-phase apparent power	VA
Rated Active Power	Inverter nominal three-phase apparent power	W
Grid Support Functions Voltage Reference	Choose between average of three-phase RMS or positive sequence	-
Initial values [Freq, V, P, Q, Vdc]	Give the initializing value to the defined parameters	[Hz, pu, pu, pu, pu]
Sample Time	Timestep of the signal conditioning block	s

Filters Tab

Name	Description	Unit

Name	Description	Unit
Power Measurement Filter Time Constant	Specify the time constant for the power measurement first-order filter	s
DC Link Voltage Measurement Filter Time Constant	Specify the time constant for the DC link voltage measurement first-order filter	s

PLL Tab

Name	Description	Unit

Name	Description	Unit
Regulator gains [Kp,Ki, Kd]	Specify the proportional, integral, and derivative gains of the internal PID controller. Use the gains to tune the PLL response time, overshoot, and steady-state error performances	-
Time constant for derivative action	Specify the time constant for the first-order filter of the PID derivative block	s
Maximum rate of change of frequency	Specify the maximum positive and negative slope of the signal frequency	Hz/s
Filter cut-off frequency for frequency measurement	Specify the second-order low-pass filter cut-off frequency	Hz

Inputs, Outputs, and Signals Available for Monitoring

Inputs

Name	Description	Unit

Name	Description	Unit
Vgrid	Instantaneous three-phase grid voltages	V
Igrid	Instantaneous three-phase grid currents	A
Vdc	Nominal DC link voltage	V

Outputs

Name	Description	Unit

Name	Description	Unit
P	Positive sequence active power evaluated using positive sequence voltage and current followed by a low-pass filter	pu
Q	Positive sequence reactive power evaluated using positive sequence voltage and current followed by a low pass filter	pu
PF	Power factor evaluation using active and reactive power	-
Vg	Three-phase instantaneous grid voltages	pu
Vrms	RMS value of the three-phase grid voltages	pu
Ig	Three-phase instantaneous grid currents	pu
Vdc_pu	Nominal DC link voltage	pu
Vrms_avg	Average of the RMS value of three-phase grid voltages	pu
Freq	Frequency of the three-phase grid voltage obtained from PLL	Hz
wt	Angle varying between 0 and 2*pi, synchronized on zero crossings of the fundamental (positive-sequence) of phase A voltage	rad

Limitations

Currently, the Signal Conditioning Block only supports three-phase balanced voltages and currents.

Intellectual Property Disclaimer

Natural Resources Canada owns all intellectual property rights in the Smart Inverter Modelling Toolbox software and related products.

ARTEMiS User Documentation

Signal Conditioning Block (Three-Phase)