Pub Date : 2020-07-01DOI: 10.1109/ICHQP46026.2020.9177872
A. Castellanos-Escamilla, N. Watson, R. Langella
As measurement and communication technology improves algorithms are being developed to get more useful information from the recorded data. One such technique is transient state estimation (TSE) which estimates the node voltages at unmonitored location from current and voltage waveforms measurements recorded during a transient event. This is useful for determining the sources of disturbances. One of the previous limitations was the lumped representation of transmission lines which limited its application to distribution systems. This paper presents a new distributed parameter transmission line model using numerical integrator substitution approach for modelling the travelling wave transmission line model. The accuracy of the model is investigated for different scenarios. To do so, the proposed algorithm is applied to two test transmission systems. The results show that a good estimation is obtained with the proposed algorithm when long transmission lines are present in the system being estimated.
{"title":"Transient State Estimation for Transmission Systems","authors":"A. Castellanos-Escamilla, N. Watson, R. Langella","doi":"10.1109/ICHQP46026.2020.9177872","DOIUrl":"https://doi.org/10.1109/ICHQP46026.2020.9177872","url":null,"abstract":"As measurement and communication technology improves algorithms are being developed to get more useful information from the recorded data. One such technique is transient state estimation (TSE) which estimates the node voltages at unmonitored location from current and voltage waveforms measurements recorded during a transient event. This is useful for determining the sources of disturbances. One of the previous limitations was the lumped representation of transmission lines which limited its application to distribution systems. This paper presents a new distributed parameter transmission line model using numerical integrator substitution approach for modelling the travelling wave transmission line model. The accuracy of the model is investigated for different scenarios. To do so, the proposed algorithm is applied to two test transmission systems. The results show that a good estimation is obtained with the proposed algorithm when long transmission lines are present in the system being estimated.","PeriodicalId":436720,"journal":{"name":"2020 19th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132947272","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 : 2020-07-01DOI: 10.1109/ICHQP46026.2020.9177895
J. David, V. Gosbell, D. Robinson, S. Perera, S. Elphick
A key component to management of harmonic voltage levels in MV and LV distribution systems is the allocation of harmonic emissions to MV and LV customers. The principals of harmonic emission allocations outlined in IEC Technical Report 61000-3-6 are relatively straight forward to apply when both the capacity of the network and the extent of all future load connections are known. However, allocations are made more complex when distributed generation, typically power electronic based, are added to the mix of customer connections. This added complexity is due to distributed generation potentially impacting the hosting capacity of the network, i.e. enabling more customer connections, and the uncertainty for network planners in quantifying the likelihood of future distributed generation connections, given the prolific growth of renewables. This paper introduces a tapered probabilistic approach for network planners to undertake harmonic emission allocations for MV and LV networks which are likely to host significant levels of renewable based distribution generation. The method is demonstrated using a simplified network model.
{"title":"Harmonic Allocation Allowing for Uncertainty of Distributed Generation in MV/LV Power Systems","authors":"J. David, V. Gosbell, D. Robinson, S. Perera, S. Elphick","doi":"10.1109/ICHQP46026.2020.9177895","DOIUrl":"https://doi.org/10.1109/ICHQP46026.2020.9177895","url":null,"abstract":"A key component to management of harmonic voltage levels in MV and LV distribution systems is the allocation of harmonic emissions to MV and LV customers. The principals of harmonic emission allocations outlined in IEC Technical Report 61000-3-6 are relatively straight forward to apply when both the capacity of the network and the extent of all future load connections are known. However, allocations are made more complex when distributed generation, typically power electronic based, are added to the mix of customer connections. This added complexity is due to distributed generation potentially impacting the hosting capacity of the network, i.e. enabling more customer connections, and the uncertainty for network planners in quantifying the likelihood of future distributed generation connections, given the prolific growth of renewables. This paper introduces a tapered probabilistic approach for network planners to undertake harmonic emission allocations for MV and LV networks which are likely to host significant levels of renewable based distribution generation. The method is demonstrated using a simplified network model.","PeriodicalId":436720,"journal":{"name":"2020 19th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121783326","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 : 2020-07-01DOI: 10.1109/ICHQP46026.2020.9177924
Dilini Darmawardana, S. Perera, D. Robinson, Jan Meyer, U. Jayatunga
In addition to the low order harmonics, power electronic systems tend to emit high frequency emissions (HF) in the range of 2 - 150 kHz where photovoltaic (PV) inverters play an important role. The recent high penetration of PV inverters in electricity distribution networks has necessitated the development of PV inverter models suitable for HF studies. Some of the major concerns associated with this work include selecting a suitable modelling approach, building experimental setups and achieving a compromise between the simplicity and the accuracy of the model. Based on research undertaken using commercially available single-phase PV inverters, this paper presents in detail how the aforementioned concerns can be handled to develop inverter models that are suitable for HF emission studies.
{"title":"Important Considerations in Development of PV Inverter Models for High Frequency Emission (Supraharmonic) Studies","authors":"Dilini Darmawardana, S. Perera, D. Robinson, Jan Meyer, U. Jayatunga","doi":"10.1109/ICHQP46026.2020.9177924","DOIUrl":"https://doi.org/10.1109/ICHQP46026.2020.9177924","url":null,"abstract":"In addition to the low order harmonics, power electronic systems tend to emit high frequency emissions (HF) in the range of 2 - 150 kHz where photovoltaic (PV) inverters play an important role. The recent high penetration of PV inverters in electricity distribution networks has necessitated the development of PV inverter models suitable for HF studies. Some of the major concerns associated with this work include selecting a suitable modelling approach, building experimental setups and achieving a compromise between the simplicity and the accuracy of the model. Based on research undertaken using commercially available single-phase PV inverters, this paper presents in detail how the aforementioned concerns can be handled to develop inverter models that are suitable for HF emission studies.","PeriodicalId":436720,"journal":{"name":"2020 19th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"119 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113944725","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 : 2020-07-01DOI: 10.1109/ICHQP46026.2020.9177901
O. Lennerhag, A. Dernfalk, P. Nygren
This paper presents measurements in the supraharmonic range at a 70 kV busbar feeding four static frequency converters used in the Swedish railway system. The voltage distortion was analyzed for different operational states of the feeding network and four distinct characteristics were identified. It was found that variations in the operational scenario mainly affected the waveform distortion up to about 5 kHz. As the number of converters in operation increased, a noticeable impact could be seen on the frequency characteristics above 10 kHz. Aside from steady-state measurements, several events were analyzed, and it was found that the waveform following disconnection contained significant distortion, albeit for a short period of time.
{"title":"Supraharmonics in the presence of static frequency converters feeding a 16 ⅔ Hz railway system","authors":"O. Lennerhag, A. Dernfalk, P. Nygren","doi":"10.1109/ICHQP46026.2020.9177901","DOIUrl":"https://doi.org/10.1109/ICHQP46026.2020.9177901","url":null,"abstract":"This paper presents measurements in the supraharmonic range at a 70 kV busbar feeding four static frequency converters used in the Swedish railway system. The voltage distortion was analyzed for different operational states of the feeding network and four distinct characteristics were identified. It was found that variations in the operational scenario mainly affected the waveform distortion up to about 5 kHz. As the number of converters in operation increased, a noticeable impact could be seen on the frequency characteristics above 10 kHz. Aside from steady-state measurements, several events were analyzed, and it was found that the waveform following disconnection contained significant distortion, albeit for a short period of time.","PeriodicalId":436720,"journal":{"name":"2020 19th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"385 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125853233","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 : 2020-07-01DOI: 10.1109/ICHQP46026.2020.9177910
Huaying Zhang, Hongxin Li, Qing Wang, Jingwen Ai, Yan Li
In order to improve competitiveness, the utility began to develop different premium power supply strategies for users. To identify investment value of users is the primary task. This paper proposes five indexes to assess the investment value of the users, including the voltage sag level of the grid, the process immunity level of the equipment, the acceptable level of users, the credit of users and the power demand level of users. The comprehensive parameter immunity time curve area is proposed to analyze the immunity of the users’ equipment to voltage sag. The entropy weight method is used to qualify the demand of premium power of users, and the investment value of premium power supply of sensitive users can be depicted based on the coordinate axis. Lastly, the proposed method is used to identify the investment value of five sensitive high-tech users, the identification results prove the correctness and the feasibility of the proposed method.
{"title":"A New Method to Identify the Investment Value of Premium Power Supply of Sensitive Users","authors":"Huaying Zhang, Hongxin Li, Qing Wang, Jingwen Ai, Yan Li","doi":"10.1109/ICHQP46026.2020.9177910","DOIUrl":"https://doi.org/10.1109/ICHQP46026.2020.9177910","url":null,"abstract":"In order to improve competitiveness, the utility began to develop different premium power supply strategies for users. To identify investment value of users is the primary task. This paper proposes five indexes to assess the investment value of the users, including the voltage sag level of the grid, the process immunity level of the equipment, the acceptable level of users, the credit of users and the power demand level of users. The comprehensive parameter immunity time curve area is proposed to analyze the immunity of the users’ equipment to voltage sag. The entropy weight method is used to qualify the demand of premium power of users, and the investment value of premium power supply of sensitive users can be depicted based on the coordinate axis. Lastly, the proposed method is used to identify the investment value of five sensitive high-tech users, the identification results prove the correctness and the feasibility of the proposed method.","PeriodicalId":436720,"journal":{"name":"2020 19th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123948920","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 : 2020-07-01DOI: 10.1109/ICHQP46026.2020.9177931
T. D. Kahingala, S. Perera, A. Agalgaonkar, U. Jayatunga
Voltage unbalance (VU) emission assessment is a challenging task due to the complex interactions between the sources of voltage unbalance. Consequently, to account for transferred voltage unbalance from neighbouring busbars, IEC/TR 61000-3-13 has introduced influence and transfer coefficients in the VU allocation and emission assessment process. However, no generalised practical approaches exist to evaluate these coefficients where as IEC guidelines suggest some approximations based on simulations and field measurements. As an alternative, this paper proposes a sensitivity analysis of network VU to unbalanced installations that can be employed in VU emission assessment. The proposed methodology uses readily available inputs and utilises a linearised approach to determine the network wide sensitivity of VU to unbalanced installations which makes it feasible for practical implementation.
{"title":"Sensitivity of Network Wide Voltage Unbalance Levels to Variations in Unbalanced Installations","authors":"T. D. Kahingala, S. Perera, A. Agalgaonkar, U. Jayatunga","doi":"10.1109/ICHQP46026.2020.9177931","DOIUrl":"https://doi.org/10.1109/ICHQP46026.2020.9177931","url":null,"abstract":"Voltage unbalance (VU) emission assessment is a challenging task due to the complex interactions between the sources of voltage unbalance. Consequently, to account for transferred voltage unbalance from neighbouring busbars, IEC/TR 61000-3-13 has introduced influence and transfer coefficients in the VU allocation and emission assessment process. However, no generalised practical approaches exist to evaluate these coefficients where as IEC guidelines suggest some approximations based on simulations and field measurements. As an alternative, this paper proposes a sensitivity analysis of network VU to unbalanced installations that can be employed in VU emission assessment. The proposed methodology uses readily available inputs and utilises a linearised approach to determine the network wide sensitivity of VU to unbalanced installations which makes it feasible for practical implementation.","PeriodicalId":436720,"journal":{"name":"2020 19th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"616 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133918465","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 : 2020-07-01DOI: 10.1109/ICHQP46026.2020.9177937
Soheil Mohseni, A. Brent, Daniel Burmester
This paper proposes a novel multi-objective optimization modelling framework for the optimal design of stand-alone micro-grids (MGs) with high wind power penetration in the presence of nonlinear loads. The key objective of the proposed modelling framework is to facilitate decisionmaking regarding the optimal sizes of the components of windpowered MGs under both the source-end voltage and load current harmonics, which deteriorate the power quality of the system. The problem is formulated as a bi-objective optimization model to minimize the whole-life cost of the system, whilst minimizing the whole system harmonics distortion level, and is solved using the elitist non-dominated sorting genetic algorithm (NSGA-II). The utopia point on Pareto optimal frontier is also determined using a fuzzy decision-making approach. The applicability and effectiveness of the proposed modelling framework are demonstrated on a representative stand-alone wind-powered MG conceptualized for Stewart Island, New Zealand. The simulation results indicate that the proposed model can effectively address the power quality issues in the planning phase of wind-powered sustainable energy systems serving typical nonlinear residential loads.
{"title":"Power Quality Considerations in the Planning Phase of Stand-Alone Wind-Powered Micro-Grids","authors":"Soheil Mohseni, A. Brent, Daniel Burmester","doi":"10.1109/ICHQP46026.2020.9177937","DOIUrl":"https://doi.org/10.1109/ICHQP46026.2020.9177937","url":null,"abstract":"This paper proposes a novel multi-objective optimization modelling framework for the optimal design of stand-alone micro-grids (MGs) with high wind power penetration in the presence of nonlinear loads. The key objective of the proposed modelling framework is to facilitate decisionmaking regarding the optimal sizes of the components of windpowered MGs under both the source-end voltage and load current harmonics, which deteriorate the power quality of the system. The problem is formulated as a bi-objective optimization model to minimize the whole-life cost of the system, whilst minimizing the whole system harmonics distortion level, and is solved using the elitist non-dominated sorting genetic algorithm (NSGA-II). The utopia point on Pareto optimal frontier is also determined using a fuzzy decision-making approach. The applicability and effectiveness of the proposed modelling framework are demonstrated on a representative stand-alone wind-powered MG conceptualized for Stewart Island, New Zealand. The simulation results indicate that the proposed model can effectively address the power quality issues in the planning phase of wind-powered sustainable energy systems serving typical nonlinear residential loads.","PeriodicalId":436720,"journal":{"name":"2020 19th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131967724","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 : 2020-07-01DOI: 10.1109/ICHQP46026.2020.9177884
N. Westin, C. A. Guerrero, J. Filho, N. Pereira, P. M. Silveira, T. C. Oliveira
Voltage Sags are random occurrence events in distribution networks and, due to the difficulty in providing measurement equipment at many places, capturing associated parameters become a hard task. Besides being random, they are phenomena of low frequency of occurrence within a small time window and cause severe impacts in sensitive loads. In this scenario, fault simulation methodologies such as State Enumeration and Monte Carlo Simulation come to be interesting to estimate the behavior of Voltage Sags. The challenge is to find an optimal pair of values for fault location and fault impedance discretization in State Enumeration Method, and the minimum emulation horizon to be considered for Monte Carlo Simulation. Thus, this paper compares the voltage sags impact estimated by both short circuit simulation methodologies in distribution systems. An IEEE 34 bus modified test feeder was used to assess the behavior of these methodologies. The algorithms were implemented in MATLAB®registered and the fault simulation in DistriView®registered.
{"title":"Comparison between Voltage Sag Simulation Methodologies in Distribution Systems","authors":"N. Westin, C. A. Guerrero, J. Filho, N. Pereira, P. M. Silveira, T. C. Oliveira","doi":"10.1109/ICHQP46026.2020.9177884","DOIUrl":"https://doi.org/10.1109/ICHQP46026.2020.9177884","url":null,"abstract":"Voltage Sags are random occurrence events in distribution networks and, due to the difficulty in providing measurement equipment at many places, capturing associated parameters become a hard task. Besides being random, they are phenomena of low frequency of occurrence within a small time window and cause severe impacts in sensitive loads. In this scenario, fault simulation methodologies such as State Enumeration and Monte Carlo Simulation come to be interesting to estimate the behavior of Voltage Sags. The challenge is to find an optimal pair of values for fault location and fault impedance discretization in State Enumeration Method, and the minimum emulation horizon to be considered for Monte Carlo Simulation. Thus, this paper compares the voltage sags impact estimated by both short circuit simulation methodologies in distribution systems. An IEEE 34 bus modified test feeder was used to assess the behavior of these methodologies. The algorithms were implemented in MATLAB®registered and the fault simulation in DistriView®registered.","PeriodicalId":436720,"journal":{"name":"2020 19th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132021017","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 : 2020-07-01DOI: 10.1109/ICHQP46026.2020.9177919
Firuz Zare, J. Yaghoobi, K. Gharani, D. Kumar
Harmonic emissions have been changed in distribution networks, with respect to frequency range and magnitude, due to penetration of modern power electronics systems such as Active Front End (AFE) technology utilised in renewable energy systems such as solar and wind farms. This paper presents current harmonics generated by parallel AFE inverters in distribution networks for the frequency range of 0-2 kHz to address harmonic limits in IEC 61000-3-16 standard. In this paper a comprehensive review and analysis of phase angles of all harmonics generated by grid connected power electronics systems have been carried out. The impact of phase angle for harmonic cancellation at a system level depends on the phase angle variation over a large time period. The outcome of this investigation identifies harmonic emission and behaviour of parallel grid connected inverters with AFE technology at a system level in low voltage distribution networks.
{"title":"Harmonic Cancellations in Parallel Active Front End Inverters in Distribution Networks: IEC 61000-3-16 and Phase-Angles","authors":"Firuz Zare, J. Yaghoobi, K. Gharani, D. Kumar","doi":"10.1109/ICHQP46026.2020.9177919","DOIUrl":"https://doi.org/10.1109/ICHQP46026.2020.9177919","url":null,"abstract":"Harmonic emissions have been changed in distribution networks, with respect to frequency range and magnitude, due to penetration of modern power electronics systems such as Active Front End (AFE) technology utilised in renewable energy systems such as solar and wind farms. This paper presents current harmonics generated by parallel AFE inverters in distribution networks for the frequency range of 0-2 kHz to address harmonic limits in IEC 61000-3-16 standard. In this paper a comprehensive review and analysis of phase angles of all harmonics generated by grid connected power electronics systems have been carried out. The impact of phase angle for harmonic cancellation at a system level depends on the phase angle variation over a large time period. The outcome of this investigation identifies harmonic emission and behaviour of parallel grid connected inverters with AFE technology at a system level in low voltage distribution networks.","PeriodicalId":436720,"journal":{"name":"2020 19th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115691318","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 : 2020-07-01DOI: 10.1109/ICHQP46026.2020.9177887
P. Kuwałek
Voltage fluctuation indices are parameters describing the power quality in the power grid. These indices consist of two quantities, the amplitude $delta U$ and the rate f of voltage changes. These indices are determined from changes in the rms values of voltage at time U(t). Voltage fluctuation indices allow statistical evaluation of voltage variation, also considering flicker assession. In addition, voltage fluctuation indices allow recreation of voltage changes caused by disturbing loads that changes its operating state with a frequency of up to 20 Hz. The recreation of voltage changes allows recalculation of voltage fluctuation indices to other parameters describing voltage variations, and allows determination of parameters associated with sources of voltage fluctuations. The paper has been proposed a new method for determining voltage fluctuation indices that allows for the recreation of voltage changes, considering disturbing loads that change their operating state with a frequency greater than 20 Hz. The need to change the method of determining voltage fluctuation indices is justified by the increasing number of power electronics devices, which are the source of this type of disturbances. The quality of the proposed solution was verified by simulation and experimental studies with the use of the short-time flicker indicator Pst.
{"title":"Increase of Diagnostic Capabilities of Voltage Fluctuation Indicies","authors":"P. Kuwałek","doi":"10.1109/ICHQP46026.2020.9177887","DOIUrl":"https://doi.org/10.1109/ICHQP46026.2020.9177887","url":null,"abstract":"Voltage fluctuation indices are parameters describing the power quality in the power grid. These indices consist of two quantities, the amplitude $delta U$ and the rate f of voltage changes. These indices are determined from changes in the rms values of voltage at time U(t). Voltage fluctuation indices allow statistical evaluation of voltage variation, also considering flicker assession. In addition, voltage fluctuation indices allow recreation of voltage changes caused by disturbing loads that changes its operating state with a frequency of up to 20 Hz. The recreation of voltage changes allows recalculation of voltage fluctuation indices to other parameters describing voltage variations, and allows determination of parameters associated with sources of voltage fluctuations. The paper has been proposed a new method for determining voltage fluctuation indices that allows for the recreation of voltage changes, considering disturbing loads that change their operating state with a frequency greater than 20 Hz. The need to change the method of determining voltage fluctuation indices is justified by the increasing number of power electronics devices, which are the source of this type of disturbances. The quality of the proposed solution was verified by simulation and experimental studies with the use of the short-time flicker indicator Pst.","PeriodicalId":436720,"journal":{"name":"2020 19th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120954068","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}
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