![Power Quality
© Manitoba Hydro International Ltd.
Page 2
Part 2: Load the case Harmonic_voltage_dist.pscx:
Figure 1. Simple network model of a distribution network
• Observe the harmonic impedance profile of this simple system, measured at
the capacitor bus. Consider the following conditions:
o No capacitor bank
o Both banks in service
o Only bank C1 in service
o Only bank C2 in service
RL RRL
#1 #2
V = 65.95
V
A
I2
V_BUS
Grounding
a
b
B1
B2
58
38.197
0.2
[mH]
C1 C2](https://image.slidesharecdn.com/pqnetworkfscanandharmdistortionnew-240518050701-674a690e/85/pq_network_fscan_and_harm_distortion_new-pdf-3-320.jpg)
pq_network_fscan_and_harm_distortion_new.pdf
- 1. Manitoba HVDC Research Centre | a division of Manitoba Hydro International Ltd. Tutorial :Power Quality Network Harmonic impedance scans and harmonic distortion
- 2. Power Quality © Manitoba Hydro International Ltd. Page 1 Objective(s): • Using the Network harmonic Impedance component • Identifying network resonances • Harmonic voltage amplification due to non linear loads. Application of ‘network harmonic impedance scanning’ methods to identify possible voltage distortion issues. Part 1: Load the case HV_test_system.pscx • Measure the harmonic impedance at bus 15. • Use ‘Livewire’ to plot the positive sequence impedance as a function of frequency. • Identify the resonance points. • Add 300 MVARs of capacitive reactance to bus 15 and see how the harmonic impedance profile is affected. • Note how the resonance pints have shifted. • Harmonic resonances can cause sustained over voltages and harmonic voltage distortions in networks.
- 3. Power Quality © Manitoba Hydro International Ltd. Page 2 Part 2: Load the case Harmonic_voltage_dist.pscx: Figure 1. Simple network model of a distribution network • Observe the harmonic impedance profile of this simple system, measured at the capacitor bus. Consider the following conditions: o No capacitor bank o Both banks in service o Only bank C1 in service o Only bank C2 in service RL RRL #1 #2 V = 65.95 V A I2 V_BUS Grounding a b B1 B2 58 38.197 0.2 [mH] C1 C2
- 4. Power Quality © Manitoba Hydro International Ltd. Page 3 Figure 2. Harmonic impedance profile with bank C1 in service • Observe the voltage harmonic at the bus bar and verify the harmonic distortion for each case and verify the results. • If transformer saturation is ‘disabled’ would you observe voltage distortions? Explain the observation. 0 20 40 60 80 100 120 140 160 180 200 0 200 400 600 800 1000 +Z (ohms) f (Hz) Z vs f only 58uF Both caps in only 38uF