Pub Date : 2020-11-02DOI: 10.1109/eGRID48559.2020.9330652
J. Saat, Raphael Bleilevens, D. Mildt, Jens Priebe, Niklas Wehbring, A. Moser
The use of DC distribution grids for medium and low voltage level is debated in current research. In order to support future investigations on the planning and operation of medium and low voltage DC distribution grids, this paper summarizes identified recommendations and open research questions regarding the systemic design of medium and low voltage DC distribution grids. The considered design aspects include the relevant grid equipment, the grid concepts to be used, the neutral point handling, the grid protection as well as the preferred structural design and rated voltages.
{"title":"Design Aspects of Medium and Low Voltage DC Distribution Grids - An Overview","authors":"J. Saat, Raphael Bleilevens, D. Mildt, Jens Priebe, Niklas Wehbring, A. Moser","doi":"10.1109/eGRID48559.2020.9330652","DOIUrl":"https://doi.org/10.1109/eGRID48559.2020.9330652","url":null,"abstract":"The use of DC distribution grids for medium and low voltage level is debated in current research. In order to support future investigations on the planning and operation of medium and low voltage DC distribution grids, this paper summarizes identified recommendations and open research questions regarding the systemic design of medium and low voltage DC distribution grids. The considered design aspects include the relevant grid equipment, the grid concepts to be used, the neutral point handling, the grid protection as well as the preferred structural design and rated voltages.","PeriodicalId":296524,"journal":{"name":"2020 5th IEEE Workshop on the Electronic Grid (eGRID)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124848713","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 : 2020-11-02DOI: 10.1109/eGRID48559.2020.9330664
Yuai Wei, A. Mantooth
Wide soft switching operation range, high frequency operation, and simple control strategy are the main characteristics for LLC converter. Thus, it has been widely used in industry. In particular, renewable energy systems, like photovoltaic (PV) and fuel cell, require wide voltage gain range application, which is challenging for traditional LLC converters since wide switching frequency variation range is necessary. To narrow down the switching frequency operation range, in this paper, the topology morphing control strategies for full-bridge LLC converter are investigated. The traditional full-bridge LLC converter can operate as half-bridge mode or frequency doubler operation mode by simply modifying the gate signals. Then, the converter voltage gain is doubled when compared with traditional full-bridge converter, and only half of the switching frequency operation range is required to cover the same voltage gain range. Operational principles, comparative analysis, and experimental validation are presented.
{"title":"Topology Morphing Control Strategies for Full-bridge LLC Converter","authors":"Yuai Wei, A. Mantooth","doi":"10.1109/eGRID48559.2020.9330664","DOIUrl":"https://doi.org/10.1109/eGRID48559.2020.9330664","url":null,"abstract":"Wide soft switching operation range, high frequency operation, and simple control strategy are the main characteristics for LLC converter. Thus, it has been widely used in industry. In particular, renewable energy systems, like photovoltaic (PV) and fuel cell, require wide voltage gain range application, which is challenging for traditional LLC converters since wide switching frequency variation range is necessary. To narrow down the switching frequency operation range, in this paper, the topology morphing control strategies for full-bridge LLC converter are investigated. The traditional full-bridge LLC converter can operate as half-bridge mode or frequency doubler operation mode by simply modifying the gate signals. Then, the converter voltage gain is doubled when compared with traditional full-bridge converter, and only half of the switching frequency operation range is required to cover the same voltage gain range. Operational principles, comparative analysis, and experimental validation are presented.","PeriodicalId":296524,"journal":{"name":"2020 5th IEEE Workshop on the Electronic Grid (eGRID)","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124978214","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 : 2020-11-02DOI: 10.1109/eGRID48559.2020.9330366
R. G. Iturra, P. Thiemann
The capability of an active damper to suppress resonances in a wide range of harmonics frequencies and its stability depends heavily on the tracking performance of its inner current controller. Even though nowadays most of the current controllers are implemented digitally in a microcontroller or DSP, the conventional current controller design is still done in the continuous frequency domain. Later on, the current controller discretization is carried out using transformation techniques (e.g. Tustin transformation, forward rule, etc). The disadvantage of such methodology it that the current controller bandwidth is restricted to be ten times smaller than the PWM sampling frequency. This fact affects negatively the performance of the active damper and its stability especially at small values of the emulated resistance. In this paper, we present a current controller design that is carried out directly in the discrete domain using the Ragazzini method. The result is a current closed loop with a bandwidth three times higher than the bandwidth achieved by current controllers designed with traditional methods. The achieved higher bandwidth boosts the effectiveness of the active damper and pushes its stability limit forward.
{"title":"Discrete Current Controller Design using Ragazzini Method for Active Damper","authors":"R. G. Iturra, P. Thiemann","doi":"10.1109/eGRID48559.2020.9330366","DOIUrl":"https://doi.org/10.1109/eGRID48559.2020.9330366","url":null,"abstract":"The capability of an active damper to suppress resonances in a wide range of harmonics frequencies and its stability depends heavily on the tracking performance of its inner current controller. Even though nowadays most of the current controllers are implemented digitally in a microcontroller or DSP, the conventional current controller design is still done in the continuous frequency domain. Later on, the current controller discretization is carried out using transformation techniques (e.g. Tustin transformation, forward rule, etc). The disadvantage of such methodology it that the current controller bandwidth is restricted to be ten times smaller than the PWM sampling frequency. This fact affects negatively the performance of the active damper and its stability especially at small values of the emulated resistance. In this paper, we present a current controller design that is carried out directly in the discrete domain using the Ragazzini method. The result is a current closed loop with a bandwidth three times higher than the bandwidth achieved by current controllers designed with traditional methods. The achieved higher bandwidth boosts the effectiveness of the active damper and pushes its stability limit forward.","PeriodicalId":296524,"journal":{"name":"2020 5th IEEE Workshop on the Electronic Grid (eGRID)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126631734","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 : 2020-11-02DOI: 10.1109/eGRID48559.2020.9330644
Niklas Wehbring, Raphael Bleilevens, J. Saat, M. Rose, A. Moser
Technological progress in the field of power electronics enables DC applications in distribution grids to improve grid operation and enhance power flow control. One of several options is the implementation of DC back-to-back stations in HV grids as a first step towards a more flexible grid. In cooperation with a German DSO, this paper presents results of computer-assisted simulations regarding the implementation of a DC back-to-back station in a real 110-kV HV grid. The benefit of the implementation is assessed for two relevant use cases: First, the possibility to relieve the overlaying transmission grid by minimizing the power exchange with the HV grid. And second, the reduction of grid expansion measures by better exploiting unused hosting capacities. The results show that a DC back-to-back station might be beneficial depending on converter prices and the development of the supply task for the latter case.
{"title":"Benefit of a HVDC Back-to-Back Station in a Real Distribution Grid","authors":"Niklas Wehbring, Raphael Bleilevens, J. Saat, M. Rose, A. Moser","doi":"10.1109/eGRID48559.2020.9330644","DOIUrl":"https://doi.org/10.1109/eGRID48559.2020.9330644","url":null,"abstract":"Technological progress in the field of power electronics enables DC applications in distribution grids to improve grid operation and enhance power flow control. One of several options is the implementation of DC back-to-back stations in HV grids as a first step towards a more flexible grid. In cooperation with a German DSO, this paper presents results of computer-assisted simulations regarding the implementation of a DC back-to-back station in a real 110-kV HV grid. The benefit of the implementation is assessed for two relevant use cases: First, the possibility to relieve the overlaying transmission grid by minimizing the power exchange with the HV grid. And second, the reduction of grid expansion measures by better exploiting unused hosting capacities. The results show that a DC back-to-back station might be beneficial depending on converter prices and the development of the supply task for the latter case.","PeriodicalId":296524,"journal":{"name":"2020 5th IEEE Workshop on the Electronic Grid (eGRID)","volume":"1 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120892673","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 : 2020-11-02DOI: 10.1109/eGRID48559.2020.9330668
Laura Arce, M. Chamana, I. Osman, B. Ren, Qing-Chang Zhong, S. Bayne
This work proposes the large-scale adoption of self-synchronized universal droop controller (SUDC)-based inverters to enable ancillary services for different modes of distribution system operations. The IEEE 123 bus system was modeled on a real-time simulator to study the performance of large-scale adoption of SUDC inverters in a distribution system. The resulting data collected shows that the voltage and the frequency were regulated within ranges, such as less than 5% for voltage and less than 0.5% for frequency, under different load variations and grid operations. Also, the black start was achieved within 0.4 s without any voltage overshoot. Through the simulation and validation on a small microgrid and the IEEE 123 bus distribution system, it can be concluded that the SUDC was successfully adopted to regulate the voltage and the frequency within the given ranges, and black start achieved within 1 s without voltage overshoot for different modes of distribution system operations.
{"title":"Large-Scale Adoption of Self-Synchronized Universal Droop Controller-Based Inverters to Enable Ancillary Services for Different Modes of Distribution System Operations","authors":"Laura Arce, M. Chamana, I. Osman, B. Ren, Qing-Chang Zhong, S. Bayne","doi":"10.1109/eGRID48559.2020.9330668","DOIUrl":"https://doi.org/10.1109/eGRID48559.2020.9330668","url":null,"abstract":"This work proposes the large-scale adoption of self-synchronized universal droop controller (SUDC)-based inverters to enable ancillary services for different modes of distribution system operations. The IEEE 123 bus system was modeled on a real-time simulator to study the performance of large-scale adoption of SUDC inverters in a distribution system. The resulting data collected shows that the voltage and the frequency were regulated within ranges, such as less than 5% for voltage and less than 0.5% for frequency, under different load variations and grid operations. Also, the black start was achieved within 0.4 s without any voltage overshoot. Through the simulation and validation on a small microgrid and the IEEE 123 bus distribution system, it can be concluded that the SUDC was successfully adopted to regulate the voltage and the frequency within the given ranges, and black start achieved within 1 s without voltage overshoot for different modes of distribution system operations.","PeriodicalId":296524,"journal":{"name":"2020 5th IEEE Workshop on the Electronic Grid (eGRID)","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127256871","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 : 2020-11-02DOI: 10.1109/eGRID48559.2020.9330677
E. Gümrükcü, Harshvardhan Samsukha, F. Ponci, A. Monti, G. Guidi, S. D'arco, J. Suul
This paper investigates the vehicle-to-grid (V2G) potential of the large scale electric vehicle (EV) charging infrastructures where the grid-side interface is based on a Modular Multilevel Converter (MMC). In this topology, each phase of the grid-side interface consists of two arms, each of which accommodates a number of bidirectional EV chargers. Heterogeneous connection and disconnection of EVs with different State-of-Charge (SOC) may lead to unbalanced power flow among the MMC arms. Although the studied MMC topology can tolerate limited unbalances in the loading, extreme unbalances must be prevented to limit the internal current amplitudes and avoid increased losses. Due to such unbalance limitations, the feasible V2G potential of the overall system can be smaller than the summation of individual discharge potentials of the participating EV batteries. The algorithm presented in this paper estimates the feasible V2G potential of the MMC-based system over a time window by the help of a mathematical optimization model. This model maximizes the aggregated discharge potential of the overall system by scheduling the discharge profiles of individual EV batteries while respecting the unbalance constraints of the MMC topology. Furthermore, this model is able to schedule the discharging activities in such a way that the priorities of the EV users in this regard are considered while the entire feasible V2G potential of the overall system is utilized.
{"title":"V2G Potential Estimation and Optimal Discharge Scheduling for MMC-based Charging Stations","authors":"E. Gümrükcü, Harshvardhan Samsukha, F. Ponci, A. Monti, G. Guidi, S. D'arco, J. Suul","doi":"10.1109/eGRID48559.2020.9330677","DOIUrl":"https://doi.org/10.1109/eGRID48559.2020.9330677","url":null,"abstract":"This paper investigates the vehicle-to-grid (V2G) potential of the large scale electric vehicle (EV) charging infrastructures where the grid-side interface is based on a Modular Multilevel Converter (MMC). In this topology, each phase of the grid-side interface consists of two arms, each of which accommodates a number of bidirectional EV chargers. Heterogeneous connection and disconnection of EVs with different State-of-Charge (SOC) may lead to unbalanced power flow among the MMC arms. Although the studied MMC topology can tolerate limited unbalances in the loading, extreme unbalances must be prevented to limit the internal current amplitudes and avoid increased losses. Due to such unbalance limitations, the feasible V2G potential of the overall system can be smaller than the summation of individual discharge potentials of the participating EV batteries. The algorithm presented in this paper estimates the feasible V2G potential of the MMC-based system over a time window by the help of a mathematical optimization model. This model maximizes the aggregated discharge potential of the overall system by scheduling the discharge profiles of individual EV batteries while respecting the unbalance constraints of the MMC topology. Furthermore, this model is able to schedule the discharging activities in such a way that the priorities of the EV users in this regard are considered while the entire feasible V2G potential of the overall system is utilized.","PeriodicalId":296524,"journal":{"name":"2020 5th IEEE Workshop on the Electronic Grid (eGRID)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122269909","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 : 2020-11-02DOI: 10.1109/eGRID48559.2020.9330362
G. Govaerts, L. Hallemans, J. Driesen, W. Martínez
DC grids offer many advantages in terms of efficiency, cost and ease of implementation. The protection of these grids, however, still raises many questions. Furthermore, no standardized testing procedures for testing low voltage DC grid protection systems exist. This paper proposes the design for a fault emulator capable of creating consistent faults in low voltage bipolar DC grids. The use of a fault emulator aids in the design of DC grid protection systems and supplements DC grid simulations as not all phenomena are visible in simulations. First, an overview of the design considerations is given followed by an overview of the topology. Tests are conducted determining a set of specifications for the fault emulator. Finally, a fault will be created and an explanation of the DC grid fault behavior is given.
{"title":"Design of a Bipolar DC Grid Fault Emulator","authors":"G. Govaerts, L. Hallemans, J. Driesen, W. Martínez","doi":"10.1109/eGRID48559.2020.9330362","DOIUrl":"https://doi.org/10.1109/eGRID48559.2020.9330362","url":null,"abstract":"DC grids offer many advantages in terms of efficiency, cost and ease of implementation. The protection of these grids, however, still raises many questions. Furthermore, no standardized testing procedures for testing low voltage DC grid protection systems exist. This paper proposes the design for a fault emulator capable of creating consistent faults in low voltage bipolar DC grids. The use of a fault emulator aids in the design of DC grid protection systems and supplements DC grid simulations as not all phenomena are visible in simulations. First, an overview of the design considerations is given followed by an overview of the topology. Tests are conducted determining a set of specifications for the fault emulator. Finally, a fault will be created and an explanation of the DC grid fault behavior is given.","PeriodicalId":296524,"journal":{"name":"2020 5th IEEE Workshop on the Electronic Grid (eGRID)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117268416","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 : 2020-11-02DOI: 10.1109/eGRID48559.2020.9330636
J. Morris, F. Ebe, Jennifer Pichl, Shuo Chen, G. Heilscher, Jan-Gerrit Leeser
With the ongoing digitalization in the energy transition and the rollout of intelligent measuring systems (iMSys) in Germany, new opportunities arise in communicating with distributed energy systems. For monitoring and telecontrolling the increasing number of distributed energy resources (DER) as well as flexible loads, the use of controlling systems in the distribution grid is gaining more importance. Therefore, different applications have been developed and basic functionalities tested in a laboratory and field environment. As a part of this progress the presented contribution focuses on the implementation of a test bench for monitoring and controlling systems named Controllable Local System (CLS) gateways. Based on the Controller Hardware-In-the-Loop (CHIL) respectively Power Hardware-In-the-Loop (PHIL) method, the test bench validates the bidirectional communication functionalities of a CLS Gateway, which is coupled with a photovoltaic inverter. The implemented test bench features a test automation which enables the conduction of multiple test scenarios concerning functionality, stability as well as resilience of a test object. Mainly this aims at investigating the suitability of such CLS gateways for field operation. Aside of the implemented test bench first test results are presented in this work. The investigated test CLS gateway has revealed a reliable transmission of measurement and control data during long-term examination. Also, frequent power interruptions can lead to failure of functionalities.
{"title":"Implementation of an automated test bench for monitoring and controlling systems of decentralized energy systems through Controller Hardware-In-the-Loop and Power Hardware-In-the-Loop methodology","authors":"J. Morris, F. Ebe, Jennifer Pichl, Shuo Chen, G. Heilscher, Jan-Gerrit Leeser","doi":"10.1109/eGRID48559.2020.9330636","DOIUrl":"https://doi.org/10.1109/eGRID48559.2020.9330636","url":null,"abstract":"With the ongoing digitalization in the energy transition and the rollout of intelligent measuring systems (iMSys) in Germany, new opportunities arise in communicating with distributed energy systems. For monitoring and telecontrolling the increasing number of distributed energy resources (DER) as well as flexible loads, the use of controlling systems in the distribution grid is gaining more importance. Therefore, different applications have been developed and basic functionalities tested in a laboratory and field environment. As a part of this progress the presented contribution focuses on the implementation of a test bench for monitoring and controlling systems named Controllable Local System (CLS) gateways. Based on the Controller Hardware-In-the-Loop (CHIL) respectively Power Hardware-In-the-Loop (PHIL) method, the test bench validates the bidirectional communication functionalities of a CLS Gateway, which is coupled with a photovoltaic inverter. The implemented test bench features a test automation which enables the conduction of multiple test scenarios concerning functionality, stability as well as resilience of a test object. Mainly this aims at investigating the suitability of such CLS gateways for field operation. Aside of the implemented test bench first test results are presented in this work. The investigated test CLS gateway has revealed a reliable transmission of measurement and control data during long-term examination. Also, frequent power interruptions can lead to failure of functionalities.","PeriodicalId":296524,"journal":{"name":"2020 5th IEEE Workshop on the Electronic Grid (eGRID)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131669730","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 : 2020-11-02DOI: 10.1109/eGRID48559.2020.9330643
Raphael Bleilevens, A. Moser
The use of DC distribution grids for medium and low voltage level is debated in current research. One important aspect is the short circuit current calculation, whereby for practical grid planning a simplified short circuit current calculation method is desired. Thus, this paper presents a simplified short circuit current calculation method based on a superposition approach using approximated current courses. The results demonstrate that the calculation of any desired partial short circuit current is not possible. Nevertheless, the results also highlight that a rough estimation of dimensioning relevant short circuit current characteristics for current-carrying grid equipment is possible, whereas a few restrictions are given. Therefore, we cannot guarantee a general applicability of the simplified method. Thus, further development of the promising calculation method is required. However, we recommend using transient calculations for DC distribution grids until a sufficient applicability of the simplified calculation method can be guaranteed.
{"title":"Simplified Short Circuit Current Calculation for DC Distribution Grids based on a Superposition Approach using Approximated Current Courses","authors":"Raphael Bleilevens, A. Moser","doi":"10.1109/eGRID48559.2020.9330643","DOIUrl":"https://doi.org/10.1109/eGRID48559.2020.9330643","url":null,"abstract":"The use of DC distribution grids for medium and low voltage level is debated in current research. One important aspect is the short circuit current calculation, whereby for practical grid planning a simplified short circuit current calculation method is desired. Thus, this paper presents a simplified short circuit current calculation method based on a superposition approach using approximated current courses. The results demonstrate that the calculation of any desired partial short circuit current is not possible. Nevertheless, the results also highlight that a rough estimation of dimensioning relevant short circuit current characteristics for current-carrying grid equipment is possible, whereas a few restrictions are given. Therefore, we cannot guarantee a general applicability of the simplified method. Thus, further development of the promising calculation method is required. However, we recommend using transient calculations for DC distribution grids until a sufficient applicability of the simplified calculation method can be guaranteed.","PeriodicalId":296524,"journal":{"name":"2020 5th IEEE Workshop on the Electronic Grid (eGRID)","volume":"201 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131918748","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 : 2020-11-02DOI: 10.1109/eGRID48559.2020.9330634
Yuqi Wei, A. Mantooth
In this article, we proposed a simple transformer secondary average voltage based resonant frequency tracking technique for LLC converter with DC transformer operation. It was found out that the transformer secondary side average voltage is lees than the output voltage in below resonant frequency operation region, which can be adopted to achieve resonant frequency tracking for LLC converter. Nevertheless, the proposed method fails to track the resonant frequency in above resonant frequency operation region since the transformer secondary voltage is always clamped by the output voltage in both at resonant frequency operating point and above resonant frequency operation region. Experiment results with different scenarios are presented to validate the effectiveness of the proposed method. Low cost, simple, and high noise immunity are the main advantages of the proposed method.
{"title":"A Simple Resonant Frequency Tracking Technique for DC Transformer Operation","authors":"Yuqi Wei, A. Mantooth","doi":"10.1109/eGRID48559.2020.9330634","DOIUrl":"https://doi.org/10.1109/eGRID48559.2020.9330634","url":null,"abstract":"In this article, we proposed a simple transformer secondary average voltage based resonant frequency tracking technique for LLC converter with DC transformer operation. It was found out that the transformer secondary side average voltage is lees than the output voltage in below resonant frequency operation region, which can be adopted to achieve resonant frequency tracking for LLC converter. Nevertheless, the proposed method fails to track the resonant frequency in above resonant frequency operation region since the transformer secondary voltage is always clamped by the output voltage in both at resonant frequency operating point and above resonant frequency operation region. Experiment results with different scenarios are presented to validate the effectiveness of the proposed method. Low cost, simple, and high noise immunity are the main advantages of the proposed method.","PeriodicalId":296524,"journal":{"name":"2020 5th IEEE Workshop on the Electronic Grid (eGRID)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122550535","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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