This paper discusses the method of detecting and measuring Partial Discharge using fuzzy logic. Most of insulation failures indicate Partial Discharge (PD) activity prior to the fault. Several cases show PD is the indication of insulation aging and also the cause of insulation deterioration. Further effect of PD is accelerating the insulation breakdown to occur. Many researches conclude that monitoring is important to be performed. Monitoring PD can avoid the high voltage equipment experience an early aging. Detecting PD is necessary to know the amount of PD and understand the condition of the equipment. The measurements are made using electrical methods for air insulation. The measurement results will be conducted on three level of voltages, and the results will be compared to determine the effectiveness of fuzzy logic in determining the state of the apparatus and monitoring partial discharge.
{"title":"The Step of Partial Discharge Pattern Recognition Using Fuzzy Logic","authors":"Lury Amatullah Lumba, U. Khayam, Lunnetta Safura Lumba, Claysius Dewanata Widjaja","doi":"10.1109/ICHVEPS47643.2019.9011078","DOIUrl":"https://doi.org/10.1109/ICHVEPS47643.2019.9011078","url":null,"abstract":"This paper discusses the method of detecting and measuring Partial Discharge using fuzzy logic. Most of insulation failures indicate Partial Discharge (PD) activity prior to the fault. Several cases show PD is the indication of insulation aging and also the cause of insulation deterioration. Further effect of PD is accelerating the insulation breakdown to occur. Many researches conclude that monitoring is important to be performed. Monitoring PD can avoid the high voltage equipment experience an early aging. Detecting PD is necessary to know the amount of PD and understand the condition of the equipment. The measurements are made using electrical methods for air insulation. The measurement results will be conducted on three level of voltages, and the results will be compared to determine the effectiveness of fuzzy logic in determining the state of the apparatus and monitoring partial discharge.","PeriodicalId":6677,"journal":{"name":"2019 2nd International Conference on High Voltage Engineering and Power Systems (ICHVEPS)","volume":"1 1","pages":"035-039"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88029289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-10-01DOI: 10.1109/ICHVEPS47643.2019.9011068
S. Suwarno, Yulia Erina Sari, T. I. D. K. Dewi
It has been more than a hundred year since mineral oil was used as liquid insulation for high voltage transformer. Mineral oil is obtained from petroleum through distillation processes. Petroleum is known as non-renewable resources and non-biodegradable. The flash point of mineral oil is around 150°C, thus it creates a problem for high temperature condition. Based on those facts, a new formula of liquid insulation is needed to replace mineral oil. Natural ester oil is derived from vegetable oil. It is biodegradable, non-toxic, non-flammable, and has a higher breakdown voltage. However, the viscosity of vegetable oil is high so that further treatment is needed in order to reduce the viscosity of the oil. This paper reports a sequential procedure in making natural ester oil through transesterification processes using palm oil for transformer application. The alkyl ester can be obtained from the reaction of triglycerides, alcohol and strong base as a catalyst. The by-product, which is glycerol, is then separated from the oil by using gravitational method as its density is higher than the natural ester oil. In this research, methanol is used as a reactant in transesterification reaction due to its cheap price and its fast reactivity. Potassium hydroxide also has a big role in transesterification, its used as a catalyst to make the process easier.
{"title":"The Making Processes of Natural Ester from Palm Oil through Transesterification Reaction for Transformer Application","authors":"S. Suwarno, Yulia Erina Sari, T. I. D. K. Dewi","doi":"10.1109/ICHVEPS47643.2019.9011068","DOIUrl":"https://doi.org/10.1109/ICHVEPS47643.2019.9011068","url":null,"abstract":"It has been more than a hundred year since mineral oil was used as liquid insulation for high voltage transformer. Mineral oil is obtained from petroleum through distillation processes. Petroleum is known as non-renewable resources and non-biodegradable. The flash point of mineral oil is around 150°C, thus it creates a problem for high temperature condition. Based on those facts, a new formula of liquid insulation is needed to replace mineral oil. Natural ester oil is derived from vegetable oil. It is biodegradable, non-toxic, non-flammable, and has a higher breakdown voltage. However, the viscosity of vegetable oil is high so that further treatment is needed in order to reduce the viscosity of the oil. This paper reports a sequential procedure in making natural ester oil through transesterification processes using palm oil for transformer application. The alkyl ester can be obtained from the reaction of triglycerides, alcohol and strong base as a catalyst. The by-product, which is glycerol, is then separated from the oil by using gravitational method as its density is higher than the natural ester oil. In this research, methanol is used as a reactant in transesterification reaction due to its cheap price and its fast reactivity. Potassium hydroxide also has a big role in transesterification, its used as a catalyst to make the process easier.","PeriodicalId":6677,"journal":{"name":"2019 2nd International Conference on High Voltage Engineering and Power Systems (ICHVEPS)","volume":"2014 1","pages":"024-028"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87924534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-10-01DOI: 10.1109/ICHVEPS47643.2019.9011150
U. Khayam, R. Rachmawati, F. Damanik, S. Hidayat
This paper reports electric field intensity minimization in a three-phase 150 kV GIS spacer with aim to reduce the maximum electric field intensity (Emax) in the spacer, especially around the triple junction area, where conductor, spacer, and SF6 gas meet. The three modifications of the GIS spacer and the conductor structure are performed to reduce electric field in the GIS spacer. First, the distance between phase conductors (d) is changed with varied ratio of 0.8, 0.9, 1.1, 1.15, and 1.2 times of original distance (d0). The original distance between conductor phase-S and T and phase-S and R is 206 mm, while the distance between conductor phase-R and T is 260 mm. The configuration of the conductors is also varied. The type of triangles all three conductors form is changed from an isosceles triangle (the original configuration) to an equilateral triangle. The distance between conductors in the new equilateral triangle configuration is varied from 230 mm, 250 mm, 270 mm, to 290 mm. The last parameter changed for modification in the spacer form is contact angle. The contact angle (θ) refers to the angle between the spacer-HV electrode side and the spacer-grounded electrode side. This angle is varied from 75° to 60°, 45°, and 30°. The result shows that the Emax in the spacer which is originally 138 kV/cm can be reduced from 10% up to 59%. The results show that the modification performed by controlling the phase conductors gave the Emax of 131 kV/cm when the distance between phase conductors is 1.15 times of the original distance of the unmodified spacer. A combination of modifying the distance and triangle configuration of phase conductors has reduced the Emax to 118 kV/cm. It is achieved when the phase conductors have equilateral triangle configuration with distance between conductors is 270 mm. The most significant reduction in electric field intensity is given by the modification contact angle between spacer, conductor, and SF6, that can reduce the Emax to 97 kV/cm at contact angle of 75°.
{"title":"Design Modification of Spacer and Conductor Structure for Reducing Electrical Stress on 150 kV Three-Phase GIS Spacer","authors":"U. Khayam, R. Rachmawati, F. Damanik, S. Hidayat","doi":"10.1109/ICHVEPS47643.2019.9011150","DOIUrl":"https://doi.org/10.1109/ICHVEPS47643.2019.9011150","url":null,"abstract":"This paper reports electric field intensity minimization in a three-phase 150 kV GIS spacer with aim to reduce the maximum electric field intensity (Emax) in the spacer, especially around the triple junction area, where conductor, spacer, and SF6 gas meet. The three modifications of the GIS spacer and the conductor structure are performed to reduce electric field in the GIS spacer. First, the distance between phase conductors (d) is changed with varied ratio of 0.8, 0.9, 1.1, 1.15, and 1.2 times of original distance (d0). The original distance between conductor phase-S and T and phase-S and R is 206 mm, while the distance between conductor phase-R and T is 260 mm. The configuration of the conductors is also varied. The type of triangles all three conductors form is changed from an isosceles triangle (the original configuration) to an equilateral triangle. The distance between conductors in the new equilateral triangle configuration is varied from 230 mm, 250 mm, 270 mm, to 290 mm. The last parameter changed for modification in the spacer form is contact angle. The contact angle (θ) refers to the angle between the spacer-HV electrode side and the spacer-grounded electrode side. This angle is varied from 75° to 60°, 45°, and 30°. The result shows that the Emax in the spacer which is originally 138 kV/cm can be reduced from 10% up to 59%. The results show that the modification performed by controlling the phase conductors gave the Emax of 131 kV/cm when the distance between phase conductors is 1.15 times of the original distance of the unmodified spacer. A combination of modifying the distance and triangle configuration of phase conductors has reduced the Emax to 118 kV/cm. It is achieved when the phase conductors have equilateral triangle configuration with distance between conductors is 270 mm. The most significant reduction in electric field intensity is given by the modification contact angle between spacer, conductor, and SF6, that can reduce the Emax to 97 kV/cm at contact angle of 75°.","PeriodicalId":6677,"journal":{"name":"2019 2nd International Conference on High Voltage Engineering and Power Systems (ICHVEPS)","volume":"1 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85086326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-10-01DOI: 10.1109/ICHVEPS47643.2019.9011062
B. Hochbrückner, M. Spiertz, M. Zink, A. Küchler, K. Backhaus
Under HVDC voltage application, the analysis of partial discharges shows significant shortcomings compared to measurements under AC voltage application. As due to the missing phase-angle information of the test voltage at DC, a clear differentiation of noise and partial discharge signals, as well as the differentiation of several partial discharge sources, is still a challenging task. Therefore, an approach for signal detection and clustering based on intra- and interclass correlation combined with histogram-thresholding was developed and tested by means of measured partial discharge signals. This clustering algorithm differentiates acquired signals automatically into different signal groups in order to allow further and separate investigation.As an alternative method, a k-medoids clustering as a well-known unsupervised learning technique, was tested on the measured signals. This method provides a fast and reliable performance as it is deterministic. This contribution shows the feasibility of the k-medoids algorithm applied on the signals of a partial discharge test under DC voltage application. A comparison of the histogram-thresholding clustering and the k-medoids algorithm points out the pros and cons and demonstrates which kind of clustering algorithm is the more appropriate solution. The results of this investigation can be considered for the development of a fully automated and unsupervised measurement system for partial discharge analysis under DC voltage.
{"title":"Comparison of Algorithms for Clustering of Partial Discharge Signals under DC Voltage","authors":"B. Hochbrückner, M. Spiertz, M. Zink, A. Küchler, K. Backhaus","doi":"10.1109/ICHVEPS47643.2019.9011062","DOIUrl":"https://doi.org/10.1109/ICHVEPS47643.2019.9011062","url":null,"abstract":"Under HVDC voltage application, the analysis of partial discharges shows significant shortcomings compared to measurements under AC voltage application. As due to the missing phase-angle information of the test voltage at DC, a clear differentiation of noise and partial discharge signals, as well as the differentiation of several partial discharge sources, is still a challenging task. Therefore, an approach for signal detection and clustering based on intra- and interclass correlation combined with histogram-thresholding was developed and tested by means of measured partial discharge signals. This clustering algorithm differentiates acquired signals automatically into different signal groups in order to allow further and separate investigation.As an alternative method, a k-medoids clustering as a well-known unsupervised learning technique, was tested on the measured signals. This method provides a fast and reliable performance as it is deterministic. This contribution shows the feasibility of the k-medoids algorithm applied on the signals of a partial discharge test under DC voltage application. A comparison of the histogram-thresholding clustering and the k-medoids algorithm points out the pros and cons and demonstrates which kind of clustering algorithm is the more appropriate solution. The results of this investigation can be considered for the development of a fully automated and unsupervised measurement system for partial discharge analysis under DC voltage.","PeriodicalId":6677,"journal":{"name":"2019 2nd International Conference on High Voltage Engineering and Power Systems (ICHVEPS)","volume":"1 1","pages":"041-046"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74257763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-10-01DOI: 10.1109/ICHVEPS47643.2019.9011077
Fajar Tri Wardana, R. Setiabudy
In electric power systems, good electric power transmission is vital to occupy the load requirements. Power transmission capacity on transmission lines restricted by Surge Impedance Loading (SIL). When the transmission line loaded at its SIL value, then the transmission line will be purely resistive. If the transmission line is purely resistive, then the value of drop voltage will decrease and will improve the power quality. The voltage that below its reasonable value would cause the electrical equipment does not work in the maximum performance. When a transmission line SIL level is increased, the capacity of a transmission line will also increase. Increasing the level of SIL can be done by changing the configuration of the transmission line. The conversion is done inter alia, expand the diameter of the conductor, increasing the distance between sub-conductor, increasing the number of sub-conductor per phase, and decreasing the gap between phases. From all of these variations, it can be seen that the value of SIL and drop voltage of 500kV transmission line TASIK-DEPOK. From the results obtained, it can be concluded that the value of the largest SIL occurs when the number of sub-conductor as much as 6 pieces with the sub-conductor distance between 80cm. The highest SIL is 2429.45 MW, and the highest %voltage of DEPOK bus is 96.81%.
{"title":"Study of Increasing Surge Impedance Loading (SIL) and Voltage at DEPOK Substation by Changing TASIK-DEPOK 500 kV Transmission Line's Configuration","authors":"Fajar Tri Wardana, R. Setiabudy","doi":"10.1109/ICHVEPS47643.2019.9011077","DOIUrl":"https://doi.org/10.1109/ICHVEPS47643.2019.9011077","url":null,"abstract":"In electric power systems, good electric power transmission is vital to occupy the load requirements. Power transmission capacity on transmission lines restricted by Surge Impedance Loading (SIL). When the transmission line loaded at its SIL value, then the transmission line will be purely resistive. If the transmission line is purely resistive, then the value of drop voltage will decrease and will improve the power quality. The voltage that below its reasonable value would cause the electrical equipment does not work in the maximum performance. When a transmission line SIL level is increased, the capacity of a transmission line will also increase. Increasing the level of SIL can be done by changing the configuration of the transmission line. The conversion is done inter alia, expand the diameter of the conductor, increasing the distance between sub-conductor, increasing the number of sub-conductor per phase, and decreasing the gap between phases. From all of these variations, it can be seen that the value of SIL and drop voltage of 500kV transmission line TASIK-DEPOK. From the results obtained, it can be concluded that the value of the largest SIL occurs when the number of sub-conductor as much as 6 pieces with the sub-conductor distance between 80cm. The highest SIL is 2429.45 MW, and the highest %voltage of DEPOK bus is 96.81%.","PeriodicalId":6677,"journal":{"name":"2019 2nd International Conference on High Voltage Engineering and Power Systems (ICHVEPS)","volume":"55 1","pages":"097-102"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75964227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-10-01DOI: 10.1109/ICHVEPS47643.2019.9011087
I. G. Ngurah Mahendrayana, Rahman Azis Prasojo, S. Suwarno, Sinanuri Surawijaya
Asset Wellness Calculation represents a method that combines technical diagnostic with risk assessment into an objective and quantitative value, providing the overall wellness of the asset. In this paper Asset Wellness calculation method of 150-500 KV oil immersed power transformers located in tropic region were discussed. The Asset Wellness method uses various data, not only data from technical test results such as dissolved gas analysis, electric testing, but other important data such as transformer loading data, maintenance data, age, grounding and foundation. The asset wellness method uses the IEEE, IEC, CIGRE criteria limits and limits on diagnostic tools for determining conditions. The Asset Wellness method is a combination of technical conditions with risk assessment based on the weight and criticality criteria of the equipment on the transformers which in total value will determine the health condition of the transformers. The method used in determining the criticality level of transformer equipment uses the SERP (System and Equipment Reliability Prioritization) method developed by EPRI. This method uses an approach based on technical data based on the level of criticality of the equipment combined with an assessment of the level of risk of down time. The Asset Wellness method is one of the tools in managing quantitative assets to determine the condition of the transformer and allows recommendations for the maintenance strategy of asset.
{"title":"Asset Wellness Calculation Method of 150 - 500 KV Oil Immersed Power Transformer Using Combination of Technical Diagnostic and Risk Assessment","authors":"I. G. Ngurah Mahendrayana, Rahman Azis Prasojo, S. Suwarno, Sinanuri Surawijaya","doi":"10.1109/ICHVEPS47643.2019.9011087","DOIUrl":"https://doi.org/10.1109/ICHVEPS47643.2019.9011087","url":null,"abstract":"Asset Wellness Calculation represents a method that combines technical diagnostic with risk assessment into an objective and quantitative value, providing the overall wellness of the asset. In this paper Asset Wellness calculation method of 150-500 KV oil immersed power transformers located in tropic region were discussed. The Asset Wellness method uses various data, not only data from technical test results such as dissolved gas analysis, electric testing, but other important data such as transformer loading data, maintenance data, age, grounding and foundation. The asset wellness method uses the IEEE, IEC, CIGRE criteria limits and limits on diagnostic tools for determining conditions. The Asset Wellness method is a combination of technical conditions with risk assessment based on the weight and criticality criteria of the equipment on the transformers which in total value will determine the health condition of the transformers. The method used in determining the criticality level of transformer equipment uses the SERP (System and Equipment Reliability Prioritization) method developed by EPRI. This method uses an approach based on technical data based on the level of criticality of the equipment combined with an assessment of the level of risk of down time. The Asset Wellness method is one of the tools in managing quantitative assets to determine the condition of the transformer and allows recommendations for the maintenance strategy of asset.","PeriodicalId":6677,"journal":{"name":"2019 2nd International Conference on High Voltage Engineering and Power Systems (ICHVEPS)","volume":"30 1","pages":"276-281"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76695124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-10-01DOI: 10.1109/ICHVEPS47643.2019.9011109
Yuli Astriani, G. Shafiullah, Farhad Shahnia
Imbalance power in an off-grid microgrid highly affecting its voltage variation. As microgrid is usually operated in low voltage, thus, the farthest node in the microgrid will encounter the biggest voltage drop. This paper presents a load shedding scheme for restoring the under-voltage condition at the affected load bus by imitating the droop control method. Using the Newton-Raphson power flow analysis and a simple linear regression formula, the P-V droop constant for each individual load’s bus can be calculated. The amount of active and reactive power adjustment is then retrieved referring the droop gain and the desired voltage magnitude to be corrected, the amount of active and reactive power adjustment can be retrieved. Furthermore, this paper proposes an optimization algorithm to minimize the number of disconnected loads as well as fulfilling the constraint of active and reactive power to be reduced.
{"title":"Optimizing Under-voltage Load-shedding Using Genetic Algorithm in Microgrid","authors":"Yuli Astriani, G. Shafiullah, Farhad Shahnia","doi":"10.1109/ICHVEPS47643.2019.9011109","DOIUrl":"https://doi.org/10.1109/ICHVEPS47643.2019.9011109","url":null,"abstract":"Imbalance power in an off-grid microgrid highly affecting its voltage variation. As microgrid is usually operated in low voltage, thus, the farthest node in the microgrid will encounter the biggest voltage drop. This paper presents a load shedding scheme for restoring the under-voltage condition at the affected load bus by imitating the droop control method. Using the Newton-Raphson power flow analysis and a simple linear regression formula, the P-V droop constant for each individual load’s bus can be calculated. The amount of active and reactive power adjustment is then retrieved referring the droop gain and the desired voltage magnitude to be corrected, the amount of active and reactive power adjustment can be retrieved. Furthermore, this paper proposes an optimization algorithm to minimize the number of disconnected loads as well as fulfilling the constraint of active and reactive power to be reduced.","PeriodicalId":6677,"journal":{"name":"2019 2nd International Conference on High Voltage Engineering and Power Systems (ICHVEPS)","volume":"38 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82067386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-10-01DOI: 10.1109/ICHVEPS47643.2019.9011155
M. Ridwan, J. Hartono, D. F. Dakhlan, Eko Aptono Tri Yuwono
Faulty condition caused by oscillation in a Java-Bali sub-system is investigated in this paper. The faulty condition is simulated by using power system simulation program to represent the real condition. The characteristic result of oscillation is analyzed by using the Prony method. The analysis of oscillation mode is done by decomposing the oscillation waveform into dominant frequency and damping ratio. System reconfigurations are developed by changing the generator supply direction and the setting of Power System Stabilizer (PSS). Each reconfiguration is simulated, and then the result is analyzed and compared to its default condition. Simulation result shows that by reconfiguring the direction of generation units to Middle-Java region and activating PSS of the generation unit can improve system stability.
{"title":"Small Signal Stability Analysis as Impact of System Reconfiguration","authors":"M. Ridwan, J. Hartono, D. F. Dakhlan, Eko Aptono Tri Yuwono","doi":"10.1109/ICHVEPS47643.2019.9011155","DOIUrl":"https://doi.org/10.1109/ICHVEPS47643.2019.9011155","url":null,"abstract":"Faulty condition caused by oscillation in a Java-Bali sub-system is investigated in this paper. The faulty condition is simulated by using power system simulation program to represent the real condition. The characteristic result of oscillation is analyzed by using the Prony method. The analysis of oscillation mode is done by decomposing the oscillation waveform into dominant frequency and damping ratio. System reconfigurations are developed by changing the generator supply direction and the setting of Power System Stabilizer (PSS). Each reconfiguration is simulated, and then the result is analyzed and compared to its default condition. Simulation result shows that by reconfiguring the direction of generation units to Middle-Java region and activating PSS of the generation unit can improve system stability.","PeriodicalId":6677,"journal":{"name":"2019 2nd International Conference on High Voltage Engineering and Power Systems (ICHVEPS)","volume":"33 1","pages":"114-118"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89117234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-10-01DOI: 10.1109/ICHVEPS47643.2019.9011102
M. Zainuddin, Frengki Eka Putra Surusa, Wayan Eka Sastra Wibawa, S. Syafaruddin, S. Manjang
This study aims to analyze the stability response of the synchronous generators that work in parallel with photovoltaic (PV) power plants in a power system. The synchronous generator stability aspects measured are: rotor angle, rotor speed, active and reactive power, terminal current response, excitation current response in the generator, and PV generator responses. All aspects of the stability are simulated based on six conditions of daily solar irradiation, namely 200 W/m2, 400 W/m2, 600 W/m2, 800 W/m2, 1000 W/m2, and the condition of the power system without PV generation. The non-battery PV generator of 10 MWp connected with a transmission line uses an inverter in one of the substations. This research on electricity transmission lines is modeled in a single-line diagram of 7-buses. The existing transmission lines are supplied from two synchronous generator capacities, 100 MVA and 25 MVA. This result of this study shows that the high-penetration level of PV generator is able to increase the attenuation of the power oscillations in the synchronous generators. However, the high-penetration of the PV power is depended on the level of the solar irradiances affecting on any change of the synchronous generator stability.
{"title":"Synchronous Generator Stability Investigation in Power System with High-Penetration Photovoltaics Under Varying Solar Irradiances","authors":"M. Zainuddin, Frengki Eka Putra Surusa, Wayan Eka Sastra Wibawa, S. Syafaruddin, S. Manjang","doi":"10.1109/ICHVEPS47643.2019.9011102","DOIUrl":"https://doi.org/10.1109/ICHVEPS47643.2019.9011102","url":null,"abstract":"This study aims to analyze the stability response of the synchronous generators that work in parallel with photovoltaic (PV) power plants in a power system. The synchronous generator stability aspects measured are: rotor angle, rotor speed, active and reactive power, terminal current response, excitation current response in the generator, and PV generator responses. All aspects of the stability are simulated based on six conditions of daily solar irradiation, namely 200 W/m2, 400 W/m2, 600 W/m2, 800 W/m2, 1000 W/m2, and the condition of the power system without PV generation. The non-battery PV generator of 10 MWp connected with a transmission line uses an inverter in one of the substations. This research on electricity transmission lines is modeled in a single-line diagram of 7-buses. The existing transmission lines are supplied from two synchronous generator capacities, 100 MVA and 25 MVA. This result of this study shows that the high-penetration level of PV generator is able to increase the attenuation of the power oscillations in the synchronous generators. However, the high-penetration of the PV power is depended on the level of the solar irradiances affecting on any change of the synchronous generator stability.","PeriodicalId":6677,"journal":{"name":"2019 2nd International Conference on High Voltage Engineering and Power Systems (ICHVEPS)","volume":"3 1","pages":"316-321"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89922710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-10-01DOI: 10.1109/ICHVEPS47643.2019.9011052
Y. M. Hamdani, U. Khayam
Partial discharge (PD) is a localized dielectric breakdown (which does not completely bridge the space between the two conductors) of a small portion of a solid or fluid electrical insulation system under high voltage stress. While a corona discharge is usually revealed by a relatively steady glow or brush discharge in air, partial discharges within solid insulation system are not visible. PD can occur in a gaseous, liquid or solid insulating medium. It often starts within gas voids, such as voids in solid epoxy insulation or bubbles in transformer oil. Protracted partial discharge can erode solid insulation and eventually lead to breakdown of insulation. One of the PD measurements in oil insulation is using UHF method, by measuring the waves generated by PD using antenna. One of antenna having good characteristics is UWB double layer printed antenna. In this paper the application of circular patch microstrip antenna for partial discharge detection is reported. The application of antenna on PD measurement in oil insulation, shows that the antenna is able to detect PD. The characteristics of PD: PDIV, PD waveform, PD phase pattern are measured using this antenna. The VNA testing of the antenna shows that the antenna bandwidth is 3.39 GHz.
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