What are the reasons for the occurrence of faults in a power system?
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| Papers (10) | Insight |
|---|---|
45 Citations | Among the different categories of power distribution faults, animal-caused faults are probably the ones that can be prevented most easily and effectively if appropriate control actions are taken. |
24 Citations | In-depth analysis shows that the SOC of atmosphere system contributes much to that of power system faults. |
48 Citations | This technique is capable to identify the ten different types of faults with negligible effect of variation in fault inception angle, loading and other parameters of the power distribution system. |
24 Oct 2013 23 Citations | Therefore it is very important to know the increase in power losses in the machine due to the occurrence of such faults for applying corrective actions at the precise time once the fault has been diagnosed. |
155 Citations | Our results show that individual failures are often caused by multiple faults spread throughout the system. |
05 Apr 2004 | The results indicate the occurrence of the major types and causes of incorrect protection operations that have been revealed at disturbances in the electric power system under study. |
48 Citations | Satisfactory results are obtained, and the developed methodology can be easily generalized and used to identify other causes of faults in power distribution systems. |
14 Citations | The simulation results show that a fault, whenever occurs in the aforementioned parts of power systems, is detected using the knowledge of the faults models proposed in this work. |
95 Citations | Experimental studies for real power systems reveal the usefulness of the proposed technique to diagnose faults that have uncertainty. |
18 Citations | This proposed method provides a means for both utility and consumer engineers to assess the impact of these faults and design cost effective solutions to potential power quality problems. |
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What are the primary causes of power losses in power systems?5 answersThe primary causes of power losses in power systems include technical factors like conductor resistance, voltage drops, and transformer losses, as well as non-technical factors such as theft and defective equipment. Additionally, inappropriate conductor sizing, long distribution lines, low power factor, and overloading of lines contribute significantly to power losses in electrical power systems. These losses not only result in economic losses and reduced system reliability but also impact the voltage profile and overall efficiency of the distribution network. Strategies to mitigate power losses involve improving equipment and maintenance practices, combating theft and illegal connections, implementing distributed generation systems, and optimizing grid strategies through methods like real load sharing, reactive power injection, and transformer tap changing.
What are the problems that can occur in a power system if HVDC is connected?4 answersThe problems that can occur in a power system if HVDC is connected include vulnerability to system faults and changes in operational conditions, adverse effects of low DC-side impedances and sensitive semiconductor-based integrated power electronics devices, and the risk of frequency overshoot resulting from the loss of HVDC tie. Additionally, the type, quantity, and complexity of power equipment have considerably increased in the digital power grid system, making traditional fault diagnosis methods inadequate. Therefore, artificial intelligence (AI) techniques are being explored as ideal tools to simplify solutions' complexity and enhance self-learning ability for fault diagnosis in HVDC transmission systems. Furthermore, ground faults in multiterminal HVDC networks can cause failures in electrical power systems, and quick and accurate detection and actuation are essential to avoid outages. A new protection method based on directional evaluation of the ground current has been proposed, which has been validated through computer simulations and laboratory tests. Finally, commutation failure and transient over-voltage issues can arise in HVDC systems, which can endanger the safety of power grid operation. A new control strategy has been proposed to address these issues, increasing fault detection speed, reducing voltage drop, and suppressing commutation failure probability.
What are the advantages and disadvantages of using artificial neural networks for fault detection and classification in power systems?5 answersArtificial neural networks (ANNs) offer several advantages for fault detection and classification in power systems. They can detect and classify various types of faults, including line-to-ground, line-to-line, double-line-to-ground, triple-line, and triple-line-to-ground faults. ANNs can improve the efficiency of fault detection and classification by measuring performance metrics such as mean square error, root mean square error, mean absolute error, and linear regression. They provide fast and accurate fault detection and classification, even under different conditions, making them useful for transmission line protection schemes. However, there are also some limitations to using ANNs for fault detection and classification. The performance of ANNs depends on the choice of architecture, such as the number of hidden neurons, which requires a detailed analysis. Additionally, the accuracy of ANNs in detecting and classifying faults may vary depending on the training algorithm used, such as backpropagation or Levenberg Marquardt optimization.
How can artificial intelligence be used to detect faults in power grids?5 answersArtificial intelligence (AI) techniques can be used to detect faults in power grids by leveraging the capabilities of machine learning and graph neural networks. These techniques can quickly locate system failures and enable follow-up control actions. AI can also be applied to load forecasting, power grid stability assessment, and security problems in the smart grid and power systems, enhancing the reliability and resilience of the grid. Additionally, AI provides a convenient route for power grid stability assessment, saving time on model development and numerical computation. In the field of power electronics, AI offers powerful tools for fault diagnostics and fault-tolerant control of power electronic systems, which are crucial in modern smart grids and renewable energy systems. Furthermore, AI approaches such as expert systems, artificial neural networks, and multi-agent systems have been used for fault diagnosis in power grids, improving fault detection and identification.