Location

This example model can be found in the software under the category "Benchmarks" with the file name "HVAC_230kV_172Bus_IEEE_RTS96.ecf".

Description

The HVAC 230kV 172Bus IEEE RTS96 model simulates the IEEE RTS-96 Reliability Test System. This network is used for bulk power system reliability evaluation studies. The value of the test system is that it will permit comparative and benchmark studios to be performed on new and existing reliability evaluation techniques.  This test system was developed by modifying and updating the original IEEE RTS79. The RTS96 consists of three joined RTS79 models and each RTS-79 is an area of the RTS96 model, that is, the RTS96 has area 1, area 2, and area 3. [1]. Bus data load, generations, and transmission line parameters are driven from [2]. This model contains 51 loads, 73 buses, and 100 generators connected by lines or autotransformers at four voltages, 15 kV, 18kV, 138kV, and 230 kV. For this example, three three-phase faults are considered on Buses 104, 119, and 325. The fault times can be modified as required by the user, and new faults can also be added on other buses.

All the machines of the generation system are controlled by internal exciters, governors (speed regulators), and stabilizers. The user can change this configuration by double-clicking on the machine subsystem and changing the values in the mask. The following is a snapshot of the machine (Bus118) configuration:

Figure 1: Synchronous machine configuration settings

Simulation and Results

Scenario 1: Three-phase fault on Bus 104

As part of the example model setup, the user can perform two types of scenarios. The first scenario is about introducing a three-phase fault on Bus 104 at 0.1s by 0.05s. This scenario gives the user an idea of reliability in power systems, and how it reacts after clearing a fault. The user can change these settings by going into the fault subsystem and changing the values of T1 and T2 , configuring the fault activation and clear times, respectively. To reproduce Scenario 1, the component Fault1 needs to be enabled, whereas Fault2 and Fault3 need to be disabled.

Figure 2: Fault configuration settings

The following are the results from ScopeView following the three-phase fault on Bus 104.

Figure 3: Voltage of Buses  103, 111 and 117  (Area-1) with a three-phase to ground fault at Bus 104.

Figure 4: Voltage of Buses  204, 217, and 219  (Area-2) with a three-phase to ground fault at Bus 104.

Figure 5: Voltage of Buses  304, 317, and 319  (Area-3) with a three-phase to ground fault at Bus 104.

Figure 6: Bus Voltage and Fault current with a three-phase to ground fault at Bus 104 (Area-1)

Figure 7: Machine voltages with a three-phase to-ground fault at Bus 104.

Scenario 2: Three-phase fault on Bus 119

The model is also equipped with a three-phase fault on Bus119. Similar to scenario 1, the default times for this fault are set to activate at 0.1s and clear 0.05s later. By default this fault is disabled and only the three-phase fault3 described in the scenario3 is enabled. To activate only this fault it is necessary to check the Enable option within the fault subsystem called Fault2 and also check the disable option within the faults subsystem called Fault1 and Fault3. 

The following are the results from ScopeView following the three-phase fault on Bus 119.

Figure 8: Voltage of Buses  103, 111, and 117  (Area-1) with a three-phase to ground fault at Bus 119.

Figure 9: Voltage of Buses  204, 217 and 219  (Area-2) with a three-phase to ground fault at Bus 119.

Figure 10: Voltage of Buses  304, 317 and 319  (Area-3) with a three-phase to ground fault at Bus 119.

Figure 11: Bus Voltage and Fault current with a three-phase to ground fault at Bus 119.

Figure 12: Machine voltages with a three-phase to-ground fault at Bus 119.

Scenario 3: Three-phase fault on Bus 325

The model is also equipped with a three-phase fault on Bus325. Similar to scenario 1 and scenario 2, the default times for this fault are set to activate at 0.1s and clear 0.05s later. By default, this fault is enabled. To activate only this fault it is necessary to check the Enable option within the fault subsystem called Fault3 and also check the disable option within the faults subsystem called Fault1 and Fault2. 

The following are the results from ScopeView following the three-phase fault on Bus 325.

Figure 13: Voltage of Buses  103, 111, and 117  (Area-1) with a three-phase to ground fault at Bus 325.

Figure 14: Voltage of Buses  204, 217, and 219  (Area-2) with a three-phase to ground fault at Bus 325.

Figure 15: Voltage of Buses  304, 317, and 319  (Area-3) with a three-phase to ground fault at Bus 325.

Figure 16: Bus Voltage and Fault current with a three-phase to ground fault at Bus 325 (Area-3)

Figure 17: Machine voltages with a three-phase to-ground fault at Bus 325.

References

[1] IEEE RTS Task Force of APM Subcommittee, "IEEE Reliability Test System', IEEE PAS, Vol-98, No. 6, Nov/Dec. 1979, pp 2047- 2054

[2] The IEEE Reliability Test System – 1996, IEEE Transaction on Power Systems, Vol. 14, No. 3, August 1999.

See Also

Synchronous Machine (pu Standard), Three phase fault