Nominal Frequency

Nominal grid frequency

Hz

Minimum Active Power

Minimum active power output capacity

pu

Voltage Support with Reactive Power Control

Constant Power Factor (CPF)

Specify this option to maintain a constant power factor at the point of coupling

-

Voltage-Reactive Power (Volt-VAR)

Specify this function to output reactive power reference as a function of the measured point of coupling voltage

-

Active power- Reactive power (Watt-VAR or PQ)

Specify this function to output reactive power reference as a function of the measured active power output.

-

Constant reactive power

Specify this function to output the desired reactive power reference.

-

Voltage Support with Active Power Control

None

No function is activated

-

Voltage – Active Power (Volt-Watt)

Specify this function to output active power reference as a function of the measured point of coupling voltage.

-

Frequency Support with Active Power Control

None

No function is activated

-

Frequency -Watt (Droop)

Specify this function to output active power reference as a function of the measured point of coupling frequency

-

Select Power Priority

Reactive Power Priority

When selected, active power output (Pr) is limited to keep apparent power less than or equal to 1 pu. Accordingly, active power will be curtailed for the required reactive power

-

Active Power Priority

When selected, reactive power output (Qr) is limited to keep apparent power less than or equal to 1 pu

-

Sampling Time

Specify the timestep for solving equations inside the secondary block

s

Initialization Freeze Time

The active power output (Pr) and the reactive power output (Qr) are 1 pu and 0 pu, respectively, during this interval of time directly after starting the simulation.

s

Constant Power Factor

Specify the constant power factor setpoint to be set as either Under-Excited (VAR Absorption) or Over-Excited (VAR Injection)

-

PF Limits Injecting [Min Max]

Specify the minimum and maximum power factor limits during over-excited mode (This parameter is activated when the Over-Excited (VAR Absorption) mode is chosen for Constant Power Factor and deactivated when the Over-Excited (VAR Absorption) mode is selected for Constant Power Factor).

-

Pf Injecting

Specify the power factor injection reference (This parameter is activated when the Over-Excited (VAR Absorption) mode is chosen for Constant Power Factor and deactivated when the Over-Excited (VAR Absorption) mode is selected for Constant Power Factor).

-

Pf Limits Absorbing [Min Max]

Specify the minimum and maximum power factor limits during under-excited mode (This parameter is deactivated when the Over-Excited (VAR Absorption) mode is chosen for Constant Power Factor and activated when the Over-Excited (VAR Absorption) mode is selected for Constant Power Factor).

-

Pf Absorbing

Specify the power factor absorption reference (This parameter is deactivated when the Over-Excited (VAR Absorption) mode is chosen for Constant Power Factor and activated when the Over-Excited (VAR Absorption) mode is selected for Constant Power Factor).

-

Open Loop Response Time

The desired open-loop settling time of this function.

Sec

Reference Voltage

Specify the voltage reference setpoint (center of the Volt-VAR curve)

pu

Voltage Points

Specify the voltage points of the Volt-VAR curve

pu

Reactive Power Points

Specify the reactive power points of the Volt-VAR curve

pu

Enable Autonomous Vref Adjustment

When enabled, the voltage reference (center of the Volt-VAR curve) dynamically changes to the average value of the grid voltage

-

Vref Adjustment Time Constant

Specify the voltage reference filter time constant. Vref is defined as the moving average of the measured positive sequence voltage at the point of coupling over a user-defined time window. (This parameter is activated when the Enable Autonomous Vref Adjustment is enabled). 

s

Open Loop Response Time

Desired open-loop settling time for the transient response of this function

s

Active Power Points

Specify the active power points of the Watt-VAR curve

pu

Reactive Power Points

Specify the reactive power points of the Watt-VAR curve

pu

Open Loop Response Time

The desired open-loop settling time of this function

s

Reactive Power Excitation

Specify the reactive power excitation setpoint to be set as either under or overexcited

-

Reactive Power Limits Injecting [Min Max]

Specify the minimum and maximum limit for the reactive power injection  (This parameter is activated when the Over-Excited (VAR Absorption) mode is chosen for Reactive Power Excitation and deactivated when the Over-Excited (VAR Absorption) mode is selected for Reactive Power Excitation).

pu

Reactive Power Injecting

Specify the reactive power injection reference value (This parameter is activated when the Over-Excited (VAR Absorption) mode is chosen for Reactive Power Excitation and deactivated when the Over-Excited (VAR Absorption) mode is selected for Reactive Power Excitation).

pu

Reactive Power Limits Absorbing  [Min Max]

Specify the minimum and maximum limit for the reactive power absorption (This parameter is deactivated when the Over-Excited (VAR Absorption) mode is chosen for Reactive Power Excitation and activated when the Over-Excited (VAR Absorption) mode is selected for Reactive Power Excitation).

pu

Reactive Power Absorbing

Specify the reactive power absorption (This parameter is deactivated when the Over-Excited (VAR Absorption) mode is chosen for Reactive Power Excitation and activated when the Over-Excited (VAR Absorption) mode is selected for Reactive Power Excitation).

pu

Open Loop Response Time

Desired open loop settling time for the transient response of this function.

s

Voltage Points [V1 V2]

Specify the voltage points for the Volt-Watt curve

pu

Active Power Points [P1 P2]

Specify the active power points for the Volt-Watt curve

pu

Open Loop Response Time

Desired open-loop settling time for the transient response of this function

s

Under-frequency Deadband

Specify the deadband value for under-frequency. 

Hz

Under-frequency Droop Slope

Specify the droop slope for under-frequency

% (f_pu/P_pu)

Over-frequency Deadband

Specify the deadband value for over-frequency

Hz

Over-frequency Droop Slope

Specify the droop slope for over-frequency

% (f_pu/P_pu)

Open Loop Response Time

Desired open-loop settling time for the transient response of this function

s

P

Measured inverter output active power

pu

Q

Measured inverter output reactive power

pu

Vrms_avg

Average of the RMS value of three-phase grid voltages

pu

Freq

Measured frequency of inverter output voltage

Hz

Plim

Active power limit setpoint

pu

Disable

Signal used to disable the inverter. When Disable = 1, the power references are forced to 0.

-

Pr

Active power reference (Commonly used as a limiting value)

pu

Qr

Reactive power reference

pu