ENG767 Power Systems 1

Background

Power system analysis is an essential part of electrical power system design. Usually, simulations and calculations are performed to verify that the system components are installed properly as per the international standards and regulations to withstand the expected load variations and protect the system against failure. Some of the power system analyses are load flow analysis, earthing studies, fault analysis, harmonic analysis, transient and dynamic analysis, protective device settings, and switching.

To perform these system analyses, several software packages are utilized. One such software package is DIgSILENT PoweFactory. The software covers the full range of both simple and advanced applications including distributed generation (DG), wind power, solar power, performance monitoring, and real-time simulation. The software is simple to use and has a unique database concept with powerful algorithms for system modeling compatible with the windows operating system.

Objectives

The project aimed at completing the hands-on tutorial to become familiar with the software before simulating a 33-bus distribution network system using the DIgSILENT PoweFactory software.  

Methodology

The given single line model of a 33-bus distribution network system and the data table were implemented in DIgSILENT PoweFactory. The substation voltage was set to 12.66kV with a deviation of +-5% for each bus. A base power of 10MVA was also used for simulation. After that, Photovoltaic (PV) and wind-based distributed generation (DG) were added to the simulation and set according to the specified parameters. The scaling factors of time-variant generation and loads were assigned to the model. The resulting model is shown in figure 1 below.

 

Figure 1: Model

Results and Analysis

The load, PV generation, and wind generation profiles are shown below.

After DG installation, Load flow studies for different times during the day gave the results below

Step 7: Voltage profile of the feeder for different times during the day corresponding to figure 2.

 

Figure: Voltage profile at 12 am

Figure: Voltage profile at 2 am

 

Figure: Voltage profile at 6 am

 

Figure: Voltage profile at 10 am

 

Figure: Voltage profile at 2 pm

 

Figure: Voltage profile at 9 pm

Step 9: Plots of the results obtained

Percentage Voltage deviation at each bus

 

Power losses at each bus

 

Discussion

Many of the loads in the feeder have voltages below 95%. At 12 am and 2 am most loads have voltages below 0.95pu but above 0.93pu. Similarly, at 10 am and 9 pm most loads have voltages below 95%.  The voltage profile at 2 pm is the best as it has most of the voltages above 0.94pu. Large power losses are witnessed in buses 3 to 7 at all times of the day. Also, the percentage voltage deviations are largest at 2 am and 6 am but lowest at 2 pm.

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