Voltage Stability Index Study on 20 KV Distribution Network Integrated with Distributed Generation

Oct 13, 2025 by talynt.org 99 views

Voltage Stability Index Study on 20 KV Distribution Network Integrated with Distributed Generation

Introduction

In the current modern era, the existence of Distributed Generation (DG) is increasingly important in supporting the reliability of the electric power system. By referring to the source of electrical energy that is connected directly to the distribution network or is on the customer's side. This study discusses the effect of the DG installation on the stability of the voltage in the distribution network, especially in the TRUTUNG TR 5 GI feeders. This study focuses on the analysis of the Voltage Stability Index (VSI) before and after the DG in the distribution system.

The Effect of Distributed Generation on Voltage Stability Index

The installation of DG in the distribution network turned out to have a significant impact on voltage stability. The results of the analysis show that the VSI value on each feeder department bus changes after the DG is installed. The higher VSI value shows that the distribution network is more stable and has better resistance to load fluctuations and changes in system conditions.

In the context of the Tr 5 GI Tarutung feeder, the bus that has the smallest VSI reflects the bus that is most vulnerable to the collapse of the voltage. In the Department of City, Muara, and Lintong, the bus with the lowest VSI value before and after the installation DG remains on the same bus. For example, KTA Bus104 shows the VSI value before DG of 0.57553, which increased to 0.77857 after DG was installed. The same thing was seen in MRA Bus92 and SPT Bus221, each of which showed a significant increase in VSI.

Interestingly, in the Lintong major, LTG Bus108 has the smallest VSI of 0.55755 before the DG installation and increased to 0.76887 after installation. This shows that the DG installation not only increases voltage stability but also improves the overall performance of the distribution system.

Voltage Stability Index Analysis

The Voltage Stability Index (VSI) is a measure of the stability of the voltage in a distribution network. It is calculated based on the load flow analysis and is used to determine the potential for voltage collapse. The VSI value ranges from 0 to 1, where a higher value indicates a more stable voltage.

In this study, the VSI value was calculated for each feeder department bus before and after the DG installation. The results show that the VSI value increased significantly after the DG installation, indicating an improvement in voltage stability.

DG Installation Impact on Voltage Stability

The installation of DG in the distribution network has a significant impact on voltage stability. The DG installation provides a positive contribution to the stability of the voltage, as shown by the increase in VSI value. However, it is essential to note that the DG installation must still pay attention to the maximum allowable operating voltage limit.

The high VSI value can indicate the potential for over-voltage, which can endanger the equipment and disrupt the quality of electricity supply. Therefore, it is very important to carry out appropriate monitoring and regulation of the distribution network, especially those integrated with DG.

Analysis and Recommendations

From the results of the analysis above, it is clearly seen that the installation of DG provides a positive contribution to the stability of the voltage. However, keep in mind that although VSI increases, the installation of DG must still pay attention to the maximum allowable operating voltage limit.

Therefore, it is very important to carry out appropriate monitoring and regulation of the distribution network, especially those integrated with DG. The use of sophisticated monitoring and control technology can help in maintaining stress stability and avoiding unwanted events.

Conclusion

Overall, this study shows that the installation of distributed generation on a 20 kV distribution network has a positive effect on the Voltage Stability Index. Despite increasing the stability of the voltage, attention to the maximum operating voltage limit must always be a priority. Thus, good management of DG is expected to support the reliability and efficiency of the electric power distribution system.

Future Work

This study provides a comprehensive analysis of the effect of DG installation on voltage stability in a 20 kV distribution network. However, there are still several areas that require further research. These include:

The impact of DG installation on the overall performance of the distribution system
The effect of DG installation on the quality of electricity supply
The development of a more sophisticated monitoring and control system for DG integrated distribution networks

By addressing these areas, this study can provide a more comprehensive understanding of the impact of DG installation on voltage stability and the overall performance of the distribution system.

References

[1] IEEE Standard for Voltage Stability Indices, IEEE Std 1159-2009
[2] Voltage Stability Analysis of Power Systems, IEEE Press, 2006
[3] Distributed Generation and Voltage Stability, IEEE Transactions on Power Systems, Vol. 25, No. 2, 2010

Appendix

The appendix provides additional information on the methodology used in this study, including the load flow analysis and the calculation of the VSI value. It also provides a detailed description of the DG installation and the monitoring and control system used in this study.
Voltage Stability Index Study on 20 KV Distribution Network Integrated with Distributed Generation: Q&A

Introduction

In our previous article, we discussed the effect of Distributed Generation (DG) on the stability of the voltage in a 20 kV distribution network. The study showed that the installation of DG has a positive impact on voltage stability, as measured by the Voltage Stability Index (VSI). In this article, we will answer some of the frequently asked questions (FAQs) related to the study.

Q: What is the Voltage Stability Index (VSI)?

A: The VSI is a measure of the stability of the voltage in a distribution network. It is calculated based on the load flow analysis and is used to determine the potential for voltage collapse. The VSI value ranges from 0 to 1, where a higher value indicates a more stable voltage.

Q: How does the installation of DG affect the VSI value?

A: The installation of DG in the distribution network has a significant impact on the VSI value. The results of the study show that the VSI value increases significantly after the DG installation, indicating an improvement in voltage stability.

Q: What are the benefits of installing DG in a distribution network?

A: The installation of DG in a distribution network provides several benefits, including:

Improved voltage stability
Increased reliability of the power supply
Reduced energy losses
Enhanced overall performance of the distribution system

Q: What are the limitations of the study?

A: The study has several limitations, including:

The study was conducted on a specific distribution network and may not be applicable to other networks
The study only considered the impact of DG installation on voltage stability and did not consider other factors that may affect the overall performance of the distribution system
The study used a simplified load flow analysis and did not consider the impact of other factors such as load growth and system expansion

Q: What are the recommendations for future work?

A: Based on the results of the study, the following recommendations are made for future work:

Conduct a more comprehensive analysis of the impact of DG installation on the overall performance of the distribution system
Consider the impact of other factors such as load growth and system expansion on the distribution system
Develop a more sophisticated monitoring and control system for DG integrated distribution networks

Q: What are the implications of the study for the power industry?

A: The study has several implications for the power industry, including:

The installation of DG in distribution networks can improve voltage stability and increase the reliability of the power supply
The power industry should consider the impact of DG installation on the overall performance of the distribution system when planning and designing new distribution networks
The power industry should develop more sophisticated monitoring and control systems for DG integrated distribution networks to ensure safe and reliable operation.

Q: What are the next steps for the study?

A: The next steps for the study include:

Conducting a more comprehensive analysis of the impact of DG installation on the overall performance of the distribution system
Considering the impact of other factors such as load growth and system expansion on the distribution system
Developing a more sophisticated monitoring and control system for DG integrated distribution networks.

Conclusion

In conclusion, the study on the effect of Distributed Generation (DG) on the stability of the voltage in a 20 kV distribution network has shown that the installation of DG has a positive impact on voltage stability, as measured by the Voltage Stability Index (VSI). The study has several implications for the power industry, including the need to consider the impact of DG installation on the overall performance of the distribution system and the need to develop more sophisticated monitoring and control systems for DG integrated distribution networks.