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Experiment No 6
Harmonic Reduction Analysis in Electrical Power System in ETAP
Objective
➢ To design a power system on ETAP ➢ To analyze the Harmonics of electrical power system on ETAP
Required Tool
➢ ETAP
Procedure
- Drag a power grid on ETAP editor. Open power grid setting and set power grid rating at 33kV and operating values. Also set short circuit values of power grid. Figure 6.1:Power Grid Rating Figure 6.2:Power Grid Short Circuit Rating
- Connect a bus providing 33kV to transformer .Go to transformer settings and set ratings and impedance at typical values. Here transformer is connected to step down the voltage. Figure 6.3:Tramsformer Rating Figure 6.4:Transformer Impedance
- Now connect a bus with transformer secondary winding. With bus a lumped load is connected and set load nameplate settings. Onwards with bus2 cable is attached. In cable,
- Set harmonics by clicking static load editor. With Bus 3 filter is attached to reduce harmonic created due to static load. The line diagram depicted as Figure 6.7:Static Load Harmonics Figure 6.7:One Line Diagram
- Load Flow Analysis is shown in figure when filter is disabled.To check harmonic analyis,click harmonic then select study case editor and select plot.Choose a bus to plot .Run Harmonic Load Flow Analysis. Figure 6.8:Harmonic Analysis Study Case
- Now enabling filter to reduce harmonics. Set the parameter of harmonic filter editor. Repeat step 5.
Result
Load Flow Analysis
Figure 6.8:Load Flow Analysis
At first Order total Harmonic Distortion
Figure 6. 1 1:1st^ Order Harmonic Distortion
At 5th^ order total harmonic distortion
Figure 6.1 2 :5th^ Order Harmonic Distortion
Harmonic Distortion Graphical Representation
At Bus 1
Figure 6.13:Specrum at Bus 1
Waveform
Figure 6.14:Waveform of Bus 1
At Bus 2
Figure 6.15:Spectrum of Bus 2
Load Flow Analyzer
Figure 6.19:Load Flow Analyzer After Enabling Filter, Figure 6.20:One Line Diagram with enabled Harmonic Filter
Harmonic Distortion
1 st^ order Harmonic Distortion
Figure 6.21:1st^ order Harmonic Distortion with Enabled Filter
5 th^ order Harmonic Distortion
Figure 6.22:5th^ order Harmonic Distortion with Enabled Filter
Conclusion
We concluded that how harmonics can be reduced by using harmonic filter.
