Pub Date : 2018-05-01DOI: 10.1109/ICHQP.2018.8378908
R. Langella, A. Testa, J. Caicedo, A. Romero, H. Zini, Jan Meyer, N. Watson
The use of Fourier descriptors (FD) for the assessment of frequency coupling matrices (FCM) of power electronic devices is considered. After some recalls on FDs, FCM approach is discussed showing how the matrices elements can be built basing on the use of maximum two FDs under linearity hypothesis. Then, a non-linearity index that allows to check the validity of the assumed “linearity hypothesis” and to quantify the obtainable accuracy is introduced. Numerical simulations on two very simple non linear circuits are performed to show the sensitivity of the FCM elements to magnitude and phase angle variation of the background harmonic distortion using FDs and the usefulness and the behavior of the non linearity index.
{"title":"On the use of fourier descriptors for the assessment of frequency coupling matrices of power electronic devices","authors":"R. Langella, A. Testa, J. Caicedo, A. Romero, H. Zini, Jan Meyer, N. Watson","doi":"10.1109/ICHQP.2018.8378908","DOIUrl":"https://doi.org/10.1109/ICHQP.2018.8378908","url":null,"abstract":"The use of Fourier descriptors (FD) for the assessment of frequency coupling matrices (FCM) of power electronic devices is considered. After some recalls on FDs, FCM approach is discussed showing how the matrices elements can be built basing on the use of maximum two FDs under linearity hypothesis. Then, a non-linearity index that allows to check the validity of the assumed “linearity hypothesis” and to quantify the obtainable accuracy is introduced. Numerical simulations on two very simple non linear circuits are performed to show the sensitivity of the FCM elements to magnitude and phase angle variation of the background harmonic distortion using FDs and the usefulness and the behavior of the non linearity index.","PeriodicalId":6506,"journal":{"name":"2018 18th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"41 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85907177","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 : 2018-05-01DOI: 10.1109/ICHQP.2018.8378870
Lulu Li, Jing Yong
the dielectric loss factor (tanδ) can reflect the insulation condition of power cables effectively. Existing methods for online tanδ monitoring require high precision synchronized phase angle data, creating difficulty in practical application. This paper proposes a new on-line cable tanδ monitoring method without the need of phase angle information. The proposed method employs a device with an adjustable impedance to generate compensative current that has the same amplitude as the capacitive component of the cable leakage current, but opposite phase angle. By doing so, the resistive and capacitive components of the cable leakage current can be separated for tanδ calculation. Simulation studies of four different cable insulation conditions are conducted for verifying the effectiveness of the proposed approach.
{"title":"A new method for on-line cable tanδ monitoring","authors":"Lulu Li, Jing Yong","doi":"10.1109/ICHQP.2018.8378870","DOIUrl":"https://doi.org/10.1109/ICHQP.2018.8378870","url":null,"abstract":"the dielectric loss factor (tanδ) can reflect the insulation condition of power cables effectively. Existing methods for online tanδ monitoring require high precision synchronized phase angle data, creating difficulty in practical application. This paper proposes a new on-line cable tanδ monitoring method without the need of phase angle information. The proposed method employs a device with an adjustable impedance to generate compensative current that has the same amplitude as the capacitive component of the cable leakage current, but opposite phase angle. By doing so, the resistive and capacitive components of the cable leakage current can be separated for tanδ calculation. Simulation studies of four different cable insulation conditions are conducted for verifying the effectiveness of the proposed approach.","PeriodicalId":6506,"journal":{"name":"2018 18th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"1 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89929750","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 : 2018-05-01DOI: 10.1109/ICHQP.2018.8378868
H. Shadmehr, R. Chiumeo, F. Belloni
In this work, the algorithms Exact Model Order Estimation of Signal Parameters via Rotational Invariance (EMO-ESPRIT) and Sliding-Window Exact Model Order-ESPRIT (SW-EMO-ESPRIT) are analyzed in order to detect the frequency components of a distorted signal in the 2-500 kHz frequency range, with the aim of providing a possible measurement solution effective for all-over the frequency range of interest. Indeed, some standards, like IEC 61000-4-7 and IEC 61000-4-30, deal with measurement methods which are suitable for only part of that frequency range (e.g., IEC 61000-4-7: 2-9 kHz and IEC 61000-4-30: 2–150 kHz), and suggest to apply FFT algorithm on a measured rectangular window with 200 ms duration (50/60 Hz power systems). The previously mentioned methods and the method suggested by the standards are tested here on both simulated synthetic signals and experimental measured signals and the obtained results are then compared to find their “pros and cons”.
{"title":"Beyond FFT algorithm in analyzing harmonics at frequency range of 2 kHz to 500 kHz","authors":"H. Shadmehr, R. Chiumeo, F. Belloni","doi":"10.1109/ICHQP.2018.8378868","DOIUrl":"https://doi.org/10.1109/ICHQP.2018.8378868","url":null,"abstract":"In this work, the algorithms Exact Model Order Estimation of Signal Parameters via Rotational Invariance (EMO-ESPRIT) and Sliding-Window Exact Model Order-ESPRIT (SW-EMO-ESPRIT) are analyzed in order to detect the frequency components of a distorted signal in the 2-500 kHz frequency range, with the aim of providing a possible measurement solution effective for all-over the frequency range of interest. Indeed, some standards, like IEC 61000-4-7 and IEC 61000-4-30, deal with measurement methods which are suitable for only part of that frequency range (e.g., IEC 61000-4-7: 2-9 kHz and IEC 61000-4-30: 2–150 kHz), and suggest to apply FFT algorithm on a measured rectangular window with 200 ms duration (50/60 Hz power systems). The previously mentioned methods and the method suggested by the standards are tested here on both simulated synthetic signals and experimental measured signals and the obtained results are then compared to find their “pros and cons”.","PeriodicalId":6506,"journal":{"name":"2018 18th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"59 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88890206","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 : 2018-05-01DOI: 10.1109/ICHQP.2018.8378916
Denisa Galzina
This article briefly shows the problems related to power quality mitigation. It is not just technical problem, but more a financial and legal problem, because of the number of customers affected by the same disturbance. A decision making flow chart is proposed to ease the understanding of the problem.
{"title":"Economic approach to power quality mitigation","authors":"Denisa Galzina","doi":"10.1109/ICHQP.2018.8378916","DOIUrl":"https://doi.org/10.1109/ICHQP.2018.8378916","url":null,"abstract":"This article briefly shows the problems related to power quality mitigation. It is not just technical problem, but more a financial and legal problem, because of the number of customers affected by the same disturbance. A decision making flow chart is proposed to ease the understanding of the problem.","PeriodicalId":6506,"journal":{"name":"2018 18th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"2020 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78663317","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 : 2018-05-01DOI: 10.1109/ICHQP.2018.8378888
Onder Polat, M. Selim, Sezgin Kahraman Yumak, O. Gul, Rukiye Unal
Voltage sag is the most common power quality problem, which has significant consequences for industrial customers. In industrial facilities, microprocessors and semiconductor-based automated equipment is widely used. These devices are extremely vulnerable to deviations in supply voltage. Consequently, the voltage sag performance of industrial facilities needs to be assessed by measurement studies to determine root causes, characteristics and the size of the problem. In consultation with ÅF Consult Turkey, Trakya Electricity Distribution Company conducted an R&D project funded by the Turkish Energy Market Regulatory Authority to characterize and analyze voltage sag events in electrical distribution networks. In this study, power quality measurement with an IEC 61000-4-30 Class A monitoring device was performed in a textile facility in the Thrace region. The event records were evaluated using sag indices according to IEEE Std. 1564-2014 and voltage waveforms were analyzed. Furthermore, the root causes, the cost of voltage sag events and possible mitigation methods were explored.
{"title":"Assessment of voltage sag events based on measurement studies in an industrial facility","authors":"Onder Polat, M. Selim, Sezgin Kahraman Yumak, O. Gul, Rukiye Unal","doi":"10.1109/ICHQP.2018.8378888","DOIUrl":"https://doi.org/10.1109/ICHQP.2018.8378888","url":null,"abstract":"Voltage sag is the most common power quality problem, which has significant consequences for industrial customers. In industrial facilities, microprocessors and semiconductor-based automated equipment is widely used. These devices are extremely vulnerable to deviations in supply voltage. Consequently, the voltage sag performance of industrial facilities needs to be assessed by measurement studies to determine root causes, characteristics and the size of the problem. In consultation with ÅF Consult Turkey, Trakya Electricity Distribution Company conducted an R&D project funded by the Turkish Energy Market Regulatory Authority to characterize and analyze voltage sag events in electrical distribution networks. In this study, power quality measurement with an IEC 61000-4-30 Class A monitoring device was performed in a textile facility in the Thrace region. The event records were evaluated using sag indices according to IEEE Std. 1564-2014 and voltage waveforms were analyzed. Furthermore, the root causes, the cost of voltage sag events and possible mitigation methods were explored.","PeriodicalId":6506,"journal":{"name":"2018 18th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"57 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75256457","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 : 2018-05-01DOI: 10.1109/ICHQP.2018.8378911
S. Elphick, M. Crawford, S. Perera, P. Ciufo
Assessing the impact of power quality disturbances on induction motors connected to the distribution network is important because it is part of the process for determining what constitutes an appropriate disturbance level without unduly impacting the utility and customer from a technical and economic perspective. Detailed modelling is quite often the chosen method for assessment. However, simulation does not capture the nuances of design one might find across a wide range of devices connected to the power distribution network. In the current research, several common motor designs have been selected for detailed experimental analyses. The investigation involved assessing the impact of several key power quality disturbances on the operating parameters such as current and temperature rise. The results obtained indicate that changes to performance are more significant in single-phase motors compared to three-phase motors. It is quite likely that accelerated aging will occur for single-phase devices as a consequence of changes in operating temperature. Although the devices selected are indicative of a base of common induction motor designs, further experimental work should be undertaken in order to further quantify the impact of power quality disturbances on the operating parameters of these typical devices.
{"title":"Laboratory investigation of the impact of PQ on induction motor performance","authors":"S. Elphick, M. Crawford, S. Perera, P. Ciufo","doi":"10.1109/ICHQP.2018.8378911","DOIUrl":"https://doi.org/10.1109/ICHQP.2018.8378911","url":null,"abstract":"Assessing the impact of power quality disturbances on induction motors connected to the distribution network is important because it is part of the process for determining what constitutes an appropriate disturbance level without unduly impacting the utility and customer from a technical and economic perspective. Detailed modelling is quite often the chosen method for assessment. However, simulation does not capture the nuances of design one might find across a wide range of devices connected to the power distribution network. In the current research, several common motor designs have been selected for detailed experimental analyses. The investigation involved assessing the impact of several key power quality disturbances on the operating parameters such as current and temperature rise. The results obtained indicate that changes to performance are more significant in single-phase motors compared to three-phase motors. It is quite likely that accelerated aging will occur for single-phase devices as a consequence of changes in operating temperature. Although the devices selected are indicative of a base of common induction motor designs, further experimental work should be undertaken in order to further quantify the impact of power quality disturbances on the operating parameters of these typical devices.","PeriodicalId":6506,"journal":{"name":"2018 18th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"189 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77361574","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 : 2018-05-01DOI: 10.1109/ICHQP.2018.8378886
A. Bagheri, M. Bollen
This paper proposes a method for monitoring of voltages in three-phase systems using parameters of the ellipse, correspondent to the space phasor model of three-phase voltages. Three main parameters, semi-minor axis, semi-major axis and rotating angle of the ellipse are calculated as single-cycle characteristics. Once these characteristics exceed predefined threshold values, different voltage events are detected. Given whole event data the parameters of the corresponding ellipse are calculated as ‘single-event characteristics’. The proposed method is applied to different measured voltage waveforms. The simulation results confirm that the ellipse parameters are a good basis for both detecting and characterizing voltage events.
{"title":"Space phasor model based monitoring of voltages in three phase systems","authors":"A. Bagheri, M. Bollen","doi":"10.1109/ICHQP.2018.8378886","DOIUrl":"https://doi.org/10.1109/ICHQP.2018.8378886","url":null,"abstract":"This paper proposes a method for monitoring of voltages in three-phase systems using parameters of the ellipse, correspondent to the space phasor model of three-phase voltages. Three main parameters, semi-minor axis, semi-major axis and rotating angle of the ellipse are calculated as single-cycle characteristics. Once these characteristics exceed predefined threshold values, different voltage events are detected. Given whole event data the parameters of the corresponding ellipse are calculated as ‘single-event characteristics’. The proposed method is applied to different measured voltage waveforms. The simulation results confirm that the ellipse parameters are a good basis for both detecting and characterizing voltage events.","PeriodicalId":6506,"journal":{"name":"2018 18th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"55 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81016743","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 : 2018-05-01DOI: 10.1109/ICHQP.2018.8378930
J. Loncarski, Deepak E. Soman, E. Frontoni
Direct-driven point absorber type tubular wave energy converters, reflect the random nature of wave energy input to its output voltage waveform. The better conditions in the generator output stage are the first step that allows the reduction in the need of complicated power conversion system. This work presents the preliminary analysis and comparison of two important interconnection strategies of WEC-rectifier units. Two different interconnection strategies are considered based on how they build up the DC-link, i.e. parallel (well- known and used by many researchers in wave area) and cascaded (less considered) configuration of WEC-rectifier units. Conventional two-level AC/DC/AC power conversion system is used in both cases. Matlab/Simulink based system simulation is used to compare the different interconnection strategies. Various results are presented and discussed, together with the voltage ripple calculations of the DC-link voltage and output phase voltage and current, being it important for the sizing and the cost of the system.
{"title":"Interconnection strategies of point absorber type wave energy converters and rectifier units","authors":"J. Loncarski, Deepak E. Soman, E. Frontoni","doi":"10.1109/ICHQP.2018.8378930","DOIUrl":"https://doi.org/10.1109/ICHQP.2018.8378930","url":null,"abstract":"Direct-driven point absorber type tubular wave energy converters, reflect the random nature of wave energy input to its output voltage waveform. The better conditions in the generator output stage are the first step that allows the reduction in the need of complicated power conversion system. This work presents the preliminary analysis and comparison of two important interconnection strategies of WEC-rectifier units. Two different interconnection strategies are considered based on how they build up the DC-link, i.e. parallel (well- known and used by many researchers in wave area) and cascaded (less considered) configuration of WEC-rectifier units. Conventional two-level AC/DC/AC power conversion system is used in both cases. Matlab/Simulink based system simulation is used to compare the different interconnection strategies. Various results are presented and discussed, together with the voltage ripple calculations of the DC-link voltage and output phase voltage and current, being it important for the sizing and the cost of the system.","PeriodicalId":6506,"journal":{"name":"2018 18th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"19 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88068170","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 : 2018-05-01DOI: 10.1109/ICHQP.2018.8378913
S. Meliopoulos, Jiahao Xie, G. Cokkinides
Geomagnetic disturbances influence the operation of transmission systems by injecting dc like electric currents into the system causing half cycle saturation of iron core magnetic circuits, generation of harmonic currents and excessive heating. Main harmonic generating devices are directly grounded transformers. The level of the half-cycle saturation depends of the level of geomagnetically induced currents and system parameters. GIC induced harmonics will flow to other devices in the system, depending on system topology and parameters and can influence system protection and operation. Accurate computation of these effects is of paramount importance. The paper proposes a high fidelity time domain modeling approach for analysis of the waveform distortion due to GIC and the propagation of the waveform distortion throughout the system. The high fidelity model incorporates the non-linear characteristics of iron core transformers, frequency dependent characteristics of transmission lines and grounding systems and other components of the power system. While GIC does not typically enters generator circuits by virtue of their grounding practice, generators are affected by GIC as harmonics propagate into generating units via the step up transformers.
{"title":"Power system harmonic analysis under geomagnetic disturbances","authors":"S. Meliopoulos, Jiahao Xie, G. Cokkinides","doi":"10.1109/ICHQP.2018.8378913","DOIUrl":"https://doi.org/10.1109/ICHQP.2018.8378913","url":null,"abstract":"Geomagnetic disturbances influence the operation of transmission systems by injecting dc like electric currents into the system causing half cycle saturation of iron core magnetic circuits, generation of harmonic currents and excessive heating. Main harmonic generating devices are directly grounded transformers. The level of the half-cycle saturation depends of the level of geomagnetically induced currents and system parameters. GIC induced harmonics will flow to other devices in the system, depending on system topology and parameters and can influence system protection and operation. Accurate computation of these effects is of paramount importance. The paper proposes a high fidelity time domain modeling approach for analysis of the waveform distortion due to GIC and the propagation of the waveform distortion throughout the system. The high fidelity model incorporates the non-linear characteristics of iron core transformers, frequency dependent characteristics of transmission lines and grounding systems and other components of the power system. While GIC does not typically enters generator circuits by virtue of their grounding practice, generators are affected by GIC as harmonics propagate into generating units via the step up transformers.","PeriodicalId":6506,"journal":{"name":"2018 18th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"64 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91079796","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 : 2018-05-01DOI: 10.1109/ICHQP.2018.8378934
D. Schwanz, M. Bollen, A. Larsson
The connection of new installations, as wind power plants, into the public grid requires that some conditions are fulfilled. Their aim is among others to ensure a proper power quality in the grid and to ensure a high probability of electromagnetic compatibility. The harmonic emission of individual sources is one of the power quality concerns, because they can damage and increase heating in devices. However, as there are other power electronics loads are connected, the correct assessment of the harmonic emission from one specific source is not straightforward. in this paper, a review of the most used methods for harmonic emission determination is presented and some considerations are discussed regarding their use in wind power plants harmonic contribution. Depending on the application, one method is more suitable than the other. However, assumptions are necessary with any method, especially for the harmonic impedances. For wind power plants not all the presented methods are suitable. Also, further investigations are needed to determine the harmonic impedance of the wind power plant and public grid, especially around resonant frequencies.
{"title":"Some methods for harmonic emission determination in wind power plants","authors":"D. Schwanz, M. Bollen, A. Larsson","doi":"10.1109/ICHQP.2018.8378934","DOIUrl":"https://doi.org/10.1109/ICHQP.2018.8378934","url":null,"abstract":"The connection of new installations, as wind power plants, into the public grid requires that some conditions are fulfilled. Their aim is among others to ensure a proper power quality in the grid and to ensure a high probability of electromagnetic compatibility. The harmonic emission of individual sources is one of the power quality concerns, because they can damage and increase heating in devices. However, as there are other power electronics loads are connected, the correct assessment of the harmonic emission from one specific source is not straightforward. in this paper, a review of the most used methods for harmonic emission determination is presented and some considerations are discussed regarding their use in wind power plants harmonic contribution. Depending on the application, one method is more suitable than the other. However, assumptions are necessary with any method, especially for the harmonic impedances. For wind power plants not all the presented methods are suitable. Also, further investigations are needed to determine the harmonic impedance of the wind power plant and public grid, especially around resonant frequencies.","PeriodicalId":6506,"journal":{"name":"2018 18th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"87 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90605205","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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