Real-Time Simulation of 3-Level STATCOM With 72 Switches Topology OPAL-RT TECHNOLOGIES Montreal, Quebec, Canada EMS Rev. 001, October 20,

Real-Time Simulation of 3-Level Real-Time Simulation of 3-Level STATCOM With 72 Switches STATCOM With 72 Switches

TopologyTopology

OPAL-RT TECHNOLOGIESMontreal, Quebec, Canada

www.OPAL-RT.com

EMSRev. 001, October 20, 2008

Contents

Test Objective Model Description Simulation Speed Performance Simulation Results Cross-

Validation Conclusions

Test Objective

To evaluate the capacity of RT-LAB to real-time simulate the 3-Level STATCOM with 168 switches topology and verify the simulation accuracy

Model Description

a 3-level STATCOM with 72 switches for the purpose of bus voltage stabilization

A simplified STATCOM schematic (72-switch)*extracted from ‘Operating performance of the STATCOM in the Kanzaki substation’, Cigre 2005, by H. Yonezawa, et al.

Simulation Speed Performance

Offline simulation performance*.

*Test results are based on a computer of Intel Pentium®4 CPU 3.4GHz, 960 MB of RAM.

  Simulation platform

Time StepSimulation

timeWall clock

time

Time factor (Wall clock time/

simulation time)

Reference Model

EMTP/RV 3s 1 s 542.1 s 542.1

Reference Model

EMTP/RV 50s 1 s 115.6 s 115.6

Model 1Simulink /SPS/RTlab

50us 1 s 6.1 s 6.1

Model 2Simulink /SPS/RTlab

50us 1 s 6.7 s 6.7

Simulation Speed Performance

Real time simulation performance *.

*Test results are based on a real time simulator of Intel® Core TM2 Quad processors, 2.3GHz, 2GB of RAM .

 CPU 1 CPU 2 CPU 3

No. of CPU

Time step

Minimum time step

Potential minimum

time factor

Model 1

The entire system

- - 1 50us 36s 0.72

Model 2

Rest of the

system

STATCOM groups 1

to 4

STATCOM groups 5

to 73 50us 20s 0.4

Simulation Speed Performance

simulation speed (or computational power): the ratio of two time factors reference model in EMTP/RV with 50 us time step is taken as the

benchmark

Simulation Speed (Computational Power)

0.2

1.0

19.0 17.3

160.6289.0

0

1

10

100

1000

Ref. Model(3us)

EMTP/RV

Ref. Model(50us)

EMTP/RV

Model1(50us) Offline

Model2 (50us)Offline

Model1 (50us)RT simulator

Model2 (50us)RT simulator

Simulation Results Cross- Validation

Reference model (3us) in EMTP/RV VS. model 1(50 us) in Simulink/SPS/RTlab

STATCOM voltage phase-A. (unit 104V, Red for Reference model at 3us, blue for Model 1 at 50 us, and green for voltage

reference).

Simulation Results Cross- Validation

Reference model (3us) in EMTP/RV VS. model 1(50 us) in Simulink/SPS/RTlab

STATCOM current phase-A. (unit A, Red for Reference model at

3us, blue for Model 1 at 50 us).

Simulation Results Cross- Validation

Reference model (3us) in EMTP/RV VS. model 1(50 us) in Simulink/SPS/RTlab

STATCOM dc current. (unit A, Red and blue for Reference model

at 3us, green and black for Model 1 at 50 us).

Simulation Results Cross- Validation

Reference model (50us) in EMTP/RV VS. model 1(50 us) in Simulink/SPS/RTlab

STATCOM voltage phase-A. (unit 104V, Red for Reference model at 50us, blue for Model 1 at 50 us, and green for voltage

reference).

Simulation Results Cross- Validation

Reference model (50us) in EMTP/RV VS. model 1(50 us) in Simulink/SPS/RTlab

STATCOM current phase-A. (unit A, Red for Reference model at

50us, blue for Model 1 at 50 us).

Simulation Results Cross- Validation

Reference model (50us) in EMTP/RV VS. model 1(50 us) in Simulink/SPS/RTlab

STATCOM dc current. (unit A, Red and blue for Reference model

at 50us, green and black for Model 1 at 50 us).

Conclusions

model with 50us time step in Simulink/SPS/RTlab has very high currency (an equivalent of 3us time step in EMTP/RV model)

simulation speed in the Simulink/SPS/RTlab platform is much faster than in EMTP/RV. Around 17 times faster for offline and 200 times

faster in RT simulator when at same 50us time step Or up to 1445 times faster with similar accuracy.

Minimum time steps of 36us and 20us in one and 3 cores respectively for real time simulation

the 3-level STATCOM with 168 switches topology is feasible on the RT-Lab platform