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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

NameDescriptionUnit

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

NameDescriptionUnit

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

NameDescriptionUnit

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

NameDescriptionUnit

Vgrid

Instantaneous three phase grid voltages

V

Igrid

Instantaneous three phase grid currents

A

Vdc

Nominal DC link voltage

V

Outputs

NameDescriptionUnit

P

Per unit positive sequence active power evaluated using positive sequence voltage and current followed by a low-pass filter

pu

Q

Per unit 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 in per unit

pu

Vrms

RMS value of the three-phase grid voltages in per unit

pu

Ig

Three-phase instantaneous grid currents in per unit

pu

Vdc_pu

Nominal DC link voltage in per unit

pu

Vrms_avg

Average of the RMS value of three-phase grid voltages in per unit

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.


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