Accessible Unlicensed Requires Authentication Published online by De Gruyter August 11, 2021

Coordinated control and parameters optimization for PSS, POD and SVC to enhance the transient stability with the integration of DFIG based wind power systems

Jawaharlal Bhukya, Talada Appala Naidu ORCID logo, Sandeep Vuddanti ORCID logo and Charalambos Konstantinou ORCID logo

Abstract

This paper presents stability enhancement of a test system that is connected with a Wind Farm (WF) by using Power System Stabilizer (PSS) for Synchronous Generator (SG) and Power Oscillation Damper (POD) for Static Var Compensator (SVC). This paper also proposes a coordination mechanism for the controller to effectively damp out the oscillations and make the power system more stable by considering the uncertainties. The uncertainty is considered as wind speed variation and wind power penetration and different locations. The Particle Swarm Optimization (PSO) is used to overcome the controller parameter tuning drawbacks and controller coordination. The SG rotor speed deviation is selected as an objective function with various constraints for PSO. The transient stability analysis is carried out by considering large disturbance that is a three-phase fault. The nonlinear dynamic simulation results are obtained by integrating WF and SG replacement with the same rating WF. Evaluation and analysis are performed for various cases and different combination of without and with controllers. From the simulation results, it is noticed that oscillations in the system are minimized, and stability is enhanced at the maximum level. It also observed that the capability of SG and DFIG under three-phase fault is intensified by using PSO for optimized coordinated controller parameters. The robustness and effectiveness of the proposed approaches are evaluated on the IEEE-11 bus test system.


Corresponding author: Talada Appala Naidu, Electrical Engineering Department, National Institute of Technology, Tadepalligudam, 534101, Andhra Pradesh, India, E-mail:

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: None declared.

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

Appendix A

Doubly fed induction generator (DFIG) based wind farm

Power rating=(2 MVA ×450); Voltage rating=20 kV; Frequency=50 Hz .

Stator resistance Rs = 0.01 pu; Stator reactance Xs = 0.10 pu; Rotor resistance Rr = 0.01 pu. Rotor reactance Xr = 0.08 pu; Magnetization reactance Xm = 3 pu. Inertia constants, Hm = 3 kW s/kVA; Pitch control gain = 10 pu; Time constants = 3 s. Voltage control gain Kv = 10 pu; Power control time constant Te = 0.01 s. Number of poles = 4; gear box ratio = 1:89; Blade length = 75.0 m; number of blade = 3.

PI controller gain for RSC

Kp1=0.1,KI1=0.05,Kp2=0.75,KI2=0.055,Kp3=0.01,KI3=0.025,Kp4=KI4=0.0155.

PI controller gain for GSC

Kp5=0.05,KI5=0.0015,Kp6=0.01,KI6=0.05,Kp7=0.5,KI7=0.75.

PSS for SG

KPSS=90.9853,T1=T3=0.6784sec,T2=T4=0.0542sec,Twf=15s.

SVC at Bus 08

KpSVC=113.542,KISVC=1.0521,Tint=9.127s

POD for SVC

KPSS=42.4721,T1=T3=0.9412s,T2=T4=0.0334s,Twf=5s.
Amin=[KD=0.0,T1D=0.05,T2D=0.05] and Amax=[KD=200,T1D=2.00,T2D=2.00]
Bmin=[KPSS=0.00,T1=0.5,T2=0.01], and Bmin=[KPSS=100,T1=1.5,T2=0.1]
Cmin=[KPST=50,KIST=0.5,KωST=5,Tm=5,T1ST=0.5,T2ST=0.01] and Cmax=[KPST=150,KIST=1.25,KωST=15,Tm=15,T1ST=1.5,T2ST=0.1]

Amin, Bmin and Cmin as well as Amax, Bmax, and Cmax are lower and upper limits respectively.

Appendix B

IEEE-11 bus (two area system)

Table B1:

Synchronous generator data (Power rating = 900 MVA, Voltage rating = 20 kV).

Variable (p.u.)SG1 at Bus 1SG2 at Bus 2SG3 at Bus 3SG4 at Bus 4
X10.220.220.220.22
Rs0.0250.0250.0250.025
Xd0.180.180.180.18
Xd0.330.330.330.33
Xq0.190.190.190.19
Xq0.550.550.550.55
Tq0 (sec)8.08.08.08.0
Td0 (sec)0.40.40.40.4
H (sec)54546363
D0000

Table B2:

Excitation system data.

VariableSG1 at Bus 1SG2 at Bus 2SG3 at Bus 3SG4 at Bus 4
KA200200200200
TA (sec)0.0010.0010.0010.001
KE1111
TE (sec)0.3140.3140.3140.314
KF0.0630.0630.0630.063
TF (sec)0.350.350.350.35

Table B3:

Transmission line data.

From busTo busSeries resistance

R (%)
Series reactance

X (%)
Shunt susceptance

B/2 (%)
Length of transmission line (km)
560.55.02.187525
560.55.02.187525
670.33.00.583310
670.33.00.583310
670.33.00.583310
781.111.019.25110
781.111.019.25110
891.111.019.25110
891.111.019.25110
9100.33.00.583310
9100.33.00.583310
9100.33.00.583310
10110.55.02.187525
10110.55.02.187525

Table B4:

Generator step-up transformer data (on Transformer MVA Base).

From busTo busR (%)X (%)MVA base
150.01515900
260.01515900
3110.01515900
4100.01515900

Table B5:

Bus and load data.

BusType (kV)PL (MW)QL (MVAr)Qc (MVAr)PG (MW)
120720 (slack bus)
220720
320720
420720
5230
6230
7230967200100
8230
92301767350100
10230
11230

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Received: 2021-02-15
Accepted: 2021-07-16
Published Online: 2021-08-11

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