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Hi all,

I am trying to do a frequency response test for an PV inverter generic model with the following parameters on SMIB:

The response I get is: https://www.swisstransfer.com/d/782bf76f-310c-4a8a-82af-28793366d5dd

It seems that active power droop is not linear. What parameter could be changed to have a linear drop?

Thank you

Hi all,

I am trying to do a frequency response test for an PV inverter generic model with the following parameters on SMIB:

The response I get is: https://www.swisstransfer.com/d/782bf76f-310c-4a8a-82af-28793366d5dd

REGCA1: 0.0200 Tg, Converter time constant, second 10.0000 Rrpwr, LVPL ramp rate limit (pu/s) 0.9000 Brkpt, LVPL voltage 2 (pu) 0.5000 Zerox, LVPL voltage 1 (pu) 1.1000 Lvpl1, LVPL gail (pu) 1.1000 Volim, Voltage limit for High Voltage Reactive Current Management, pu 0.9000 Lvpnt1, High Voltage point for Low Voltage Active Current Management, pu 0.0300 Lvpnt0, Low Voltage point for Low Voltage Active Current Management, pu -1.0000 Iolim, Current limit for HVRCM, pu (< 0) 0.0100 Tfltr, Voltage filter time constant for LVRCM (s) 0.0000 Khv, Overvoltage compensation gain used in HVRCM (>=0 and < 1) 99.0000 Iqrmax, Upper limit on Rate of change for reactive curent (pu/s) -99.0000 Iqrmin, Lower limit on Rate of change for reactive curent (pu/s) 1.0000 Accel, Acc. factor for smoothing out voltage & angle calculations (>0 and <=1)

REECA1: 0.9000 Vdip (pu), low voltage threshold for reactive current injection 1.1000 Vup (pu), high voltage threshold for reactive current injection 0.0100 Trv (s), Voltage filter time constant -0.1000 dbd1 (pu), Voltage error dead band lower threshold (<=0) 0.1000 dbd2 (pu), Voltage error dead band upper threshold (>=0) 1.0000 Kqv (pu), Reactive current injection gain 1.0000 Iqhl (pu), Upper limit on reactive current injection Iqinj -1.0000 Iqll (pu), Lower limit on reactive current injection Iqinj 1.0000 Vref0 (pu), User defined reference (if 0, initialized by model) 0.0000 Iqfrz (pu), Value at which Iqinj is held following voltage dip 0.0000 Thld (s), Time that Iqinj is held at Iqfrz following voltage dip 0.0000 Thld2 (s) (>=0), Time for which IPMAX is held at faulted value 0.0100 Tp (s), Filter time constant for electrical power 0.6000 QMax (pu), limit for reactive power regulator -0.6000 QMin (pu) limit for reactive power regulator 1.1000 VMAX (pu), Max. limit for voltage control 0.9000 VMIN (pu), Min. limit for voltage control 0.3000 Kqp (pu), Reactive power regulator proportional gain 5.0000 Kqi (pu), Reactive power regulator integral gain 0.5000 Kvp (pu), Voltage regulator proportional gain 0.0000 Kvi (pu), Voltage regulator integral gain 0.0000 Vbias (pu), User-defined bias (normally 0) 0.0100 Tiq (s), Time constant on delay s4 99.0000 dPmax (pu/s) (>0) Power reference max. ramprate -99.0000 dPmin (pu/s) (<0) Power reference min. ramprate 1.0000 PMAX (pu), Max. power limit 0.0000 PMIN (pu), Min. power limit 1.0000 Imax (pu), Maximum allowable total converter current limit 0.0100 Tpord (s), Power filter time constant 0.0000 Vq1 (pu), Reactive Power V-I pair, voltage 0.0100 Iq1 (pu), Reactive Power V-I pair, current 0.4900 Vq2 (pu) (Vq2>Vq1), Reactive Power V-I pair, voltage 0.0100 Iq2 (pu) (Iq2>=Iq1), Reactive Power V-I pair, current 0.5000 Vq3 (pu) (Vq3>Vq2), Reactive Power V-I pair, voltage 1.0000 Iq3 (pu) (Iq3>=Iq2), Reactive Power V-I pair, current 1.2000 Vq4 (pu) (Vq4>Vq3), Reactive Power V-I pair, voltage 1.0000 Iq4 (pu) (Iq4>=Iq3), Reactive Power V-I pair, current 0.0000 Vp1 (pu), Real Power V-I pair, voltage 0.0100 Ip1 (pu), Real Power V-I pair, current 0.4900 Vp2 (pu) (Vp2>Vp1), Real Power V-I pair, voltage 0.0100 Ip2 (pu) (Ip2>=Ip1), Real Power V-I pair, current 0.5000 Vp3 (pu) (Vp3>Vp2), Real Power V-I pair, voltage 1.0000 Ip3 (pu) (Ip3>=Ip2), Real Power V-I pair, current 1.2000 Vp4 (pu) (Vp4>Vp3), Real Power V-I pair, voltage 1.0000 Ip4 (pu) (Ip4>=Ip3), Real Power V-I pair, current

REPCA1: 0.0500 Tfltr, Voltage or reactive power measurement filter time constant (s) 0.5000 Kp, Reactive power PI control proportional gain (pu) 3.0000 Ki, Reactive power PI control integral gain (pu) 0.0000 Tft, Lead time constant (s) 0.0500 Tfv, Lag time constant (s) 0.7000 Vfrz, Voltage below which State s2 is frozen (pu) 0.0000 Rc, Line drop compensation resistance (pu) 0.0000 Xc, Line drop compensation reactance (pu) 0.0000 Kc, Reactive current compensation gain (pu) 0.0500 emax, upper limit on deadband output (pu) -0.0500 emin, lower limit on deadband output (pu) 0.0000 dbd1, lower threshold for reactive power control deadband (<=0) 0.0000 dbd2, upper threshold for reactive power control deadband (>=0) 0.6000 Qmax, Upper limit on output of V/Q control (pu) -0.6000 Qmin, Lower limit on output of V/Q control (pu) 0.1000 Kpg, Proportional gain for power control (pu) 0.2500 Kig, Integral gain for power control (pu) 0.0500 Tp, Real power measurement filter time constant (s) -0.0040 fdbd1, Deadband for frequency control, lower threshold (<=0) 0.0040 fdbd2, Deadband for frequency control, upper threshold (>=0) 999.0000 femax, frequency error upper limit (pu) -999.0000 femin, frequency error lower limit (pu) 1.0000 Pmax, upper limit on power reference (pu) 0.5000 Pmin, lower limit on power reference (pu) 0.1000 Tg, Power Controller lag time constant (s) 20.0000 Ddn, droop for over-frequency conditions (pu) 20.0000 Dup, droop for under-frequency conditions (pu)

200 Remote bus number or 0 for local voltage control 300 Monitored branch FROM bus 200 Monitored branch TO bus '1' Monitored branch ID (enter within single quotes) 1 VCFlag, droop flag (0: with droop,1: line drop compensation) 1 RefFlag, flag for V or Q control(0: Q control, 1: V control) 1 Fflag, 0: disable frequency control, 1: enable

It seems that active power droop is not linear. What parameter could be changed to have a linear drop?

Thank you