Pub Date : 2021-11-08DOI: 10.1109/eGRID52793.2021.9662143
Biqi Wang, R. Burgos, Ye Tang, B. Wen
With the dramatic transition in distribution power systems from centralized fossil-based power plants to distributed energy resources (DERs), the system fault characteristics, especially the fault current profile, is likely to undergo some considerable changes, which may impose a negative effect on the dependable operation of system protective relays and complicate the design and configuration of protection schemes. This paper has studied the impacts of a high penetration level of inverter-based photovoltaic (PV) generations on a 56-bus distribution feeder under short-circuit faults, with the PV inverter control scheme in compliance with the IEEE Standard 1547–2018. The power system fault responses under both the PV inverter grid-following control mode and the grid-forming control mode were discussed. The fault current profile was analyzed under various different fault scenarios, including both three-phase and single-phase faults, under different fault severity and at different DER relative locations. The potential issues in distribution system overcurrent relay caused by the fault current contribution from utility-scale DERs are also stated.
{"title":"Fault Characteristics Analysis on 56-Bus Distribution System with Penetration of Utility-Scale PV Generation","authors":"Biqi Wang, R. Burgos, Ye Tang, B. Wen","doi":"10.1109/eGRID52793.2021.9662143","DOIUrl":"https://doi.org/10.1109/eGRID52793.2021.9662143","url":null,"abstract":"With the dramatic transition in distribution power systems from centralized fossil-based power plants to distributed energy resources (DERs), the system fault characteristics, especially the fault current profile, is likely to undergo some considerable changes, which may impose a negative effect on the dependable operation of system protective relays and complicate the design and configuration of protection schemes. This paper has studied the impacts of a high penetration level of inverter-based photovoltaic (PV) generations on a 56-bus distribution feeder under short-circuit faults, with the PV inverter control scheme in compliance with the IEEE Standard 1547–2018. The power system fault responses under both the PV inverter grid-following control mode and the grid-forming control mode were discussed. The fault current profile was analyzed under various different fault scenarios, including both three-phase and single-phase faults, under different fault severity and at different DER relative locations. The potential issues in distribution system overcurrent relay caused by the fault current contribution from utility-scale DERs are also stated.","PeriodicalId":198321,"journal":{"name":"2021 6th IEEE Workshop on the Electronic Grid (eGRID)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116709803","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 : 2021-11-08DOI: 10.1109/eGRID52793.2021.9662160
N. Muller, Jorge Barria, L. Reyes-Chamorro
Large integration of variable renewable resources into modern power grids, has forced grid operators to look for maximizing the available flexibility that can be provided by generators, storage, and loads. In particular, PV plants can provide flexibility by decreasing their active-power injection, following a grid requirement, by using a Flexible Power Point Tracking (FPPT) method. These methods are capable of tracking an external active-power setpoint, that is usually sent by the grid operator, or of tracking the maximum available PV power when the setpoint is larger than what is capable to inject due to the current irradiance. On the other hand, power optimizers (POs) have been proposed as an alternative to minimize the effects of non-uniform conditions in PV systems, by maximizing the power extraction of each PV module. However, FPPT methods have not been implemented on PV plants with POs, where a portion of the active-power requested by the grid must be allocated to each PO. In this paper, we consider a string-inverter PV configuration where the active-power request is distributed among the POs on each PV module. We propose a power-distribution technique that accounts for the individual restrictions of each PV module and PO, while being capable of following the grid's active-power setpoint. We show the results of this proposal through simulations using PLECS®.
{"title":"Flexible Power Point Tracking for Active Power Regulation in String-Inverter PV Plants with Power Optimizers","authors":"N. Muller, Jorge Barria, L. Reyes-Chamorro","doi":"10.1109/eGRID52793.2021.9662160","DOIUrl":"https://doi.org/10.1109/eGRID52793.2021.9662160","url":null,"abstract":"Large integration of variable renewable resources into modern power grids, has forced grid operators to look for maximizing the available flexibility that can be provided by generators, storage, and loads. In particular, PV plants can provide flexibility by decreasing their active-power injection, following a grid requirement, by using a Flexible Power Point Tracking (FPPT) method. These methods are capable of tracking an external active-power setpoint, that is usually sent by the grid operator, or of tracking the maximum available PV power when the setpoint is larger than what is capable to inject due to the current irradiance. On the other hand, power optimizers (POs) have been proposed as an alternative to minimize the effects of non-uniform conditions in PV systems, by maximizing the power extraction of each PV module. However, FPPT methods have not been implemented on PV plants with POs, where a portion of the active-power requested by the grid must be allocated to each PO. In this paper, we consider a string-inverter PV configuration where the active-power request is distributed among the POs on each PV module. We propose a power-distribution technique that accounts for the individual restrictions of each PV module and PO, while being capable of following the grid's active-power setpoint. We show the results of this proposal through simulations using PLECS®.","PeriodicalId":198321,"journal":{"name":"2021 6th IEEE Workshop on the Electronic Grid (eGRID)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115509434","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 : 2021-11-08DOI: 10.1109/eGRID52793.2021.9662130
J. Motwani, Yaosuo Xue, Arash Nazari, D. Dong, I. Cvetkovic, D. Boroyevich
Power converters have become a key participant within the modern grid, facilitating the grid's interaction with renewable energy sources and various loads, among others. These converters can also interact with each other, creating harmonics that were previously absent in the grid. While some previous research studies have focused on inter-converter interactions, not much focus has been on the role of pulse width modulators in these inter-converter interactions. This paper focuses on the issue and builds upon harmonic state-space modeling (HSS) to observe inter-converter harmonic interactions. A new modulator model is developed, and its implementation within HSS modeling to observe harmonic coupling between multiple inverters is highlighted. A simulation testbench is developed, and to verify the advantages and limitations of the proposed modeling approach, it is compared with two other traditional modeling methods: namely, average and switching models. The proposed method is shown to be significantly more accurate and informative than conventional average modeling methods and has considerably lower computation costs and simulation time than detailed switching models. The results are verified using extensive simulations on MATLAB.
{"title":"Analysis of Inter Converter Interactions using Harmonic State Space Modeling","authors":"J. Motwani, Yaosuo Xue, Arash Nazari, D. Dong, I. Cvetkovic, D. Boroyevich","doi":"10.1109/eGRID52793.2021.9662130","DOIUrl":"https://doi.org/10.1109/eGRID52793.2021.9662130","url":null,"abstract":"Power converters have become a key participant within the modern grid, facilitating the grid's interaction with renewable energy sources and various loads, among others. These converters can also interact with each other, creating harmonics that were previously absent in the grid. While some previous research studies have focused on inter-converter interactions, not much focus has been on the role of pulse width modulators in these inter-converter interactions. This paper focuses on the issue and builds upon harmonic state-space modeling (HSS) to observe inter-converter harmonic interactions. A new modulator model is developed, and its implementation within HSS modeling to observe harmonic coupling between multiple inverters is highlighted. A simulation testbench is developed, and to verify the advantages and limitations of the proposed modeling approach, it is compared with two other traditional modeling methods: namely, average and switching models. The proposed method is shown to be significantly more accurate and informative than conventional average modeling methods and has considerably lower computation costs and simulation time than detailed switching models. The results are verified using extensive simulations on MATLAB.","PeriodicalId":198321,"journal":{"name":"2021 6th IEEE Workshop on the Electronic Grid (eGRID)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124233946","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 : 2021-11-08DOI: 10.1109/eGRID52793.2021.9662141
Hongsheng Chong, K. Sun, Huan Chen
As the penetration rate of renewable energy in the utility grid increases, large-scale energy storage system (ESS) will become an essential infrastructure in the grid. Reversible solid oxide fuel cell (RSOFC) technology is a promising solution for large-scale ESS. However, the wide voltage range and low power of single RSOFC stack electrical characteristics have complicated the interface converter design. It is necessary to connect multiple stacks through a power conversion system to integrate the power because a single stack of RSOFC is small. This paper proposes a power conversion system for large-scale RSOFC ESS. The system consists of a cascaded H-bridge (CHB) converter and multiple multiport converters, and they are connected to a common dc bus. Because of the electrical characteristics of RSOFC, a two-stage CLLC based multiport converter topology is employed to achieve high voltage gain and operate at a wide voltage range. The control strategy of the proposed power conversion system is presented. Simulation tests verify the feasibility and effectiveness of the proposed conversion system
{"title":"A Power Conversion System For Large-Scale Reversible SOFC Energy Storage System","authors":"Hongsheng Chong, K. Sun, Huan Chen","doi":"10.1109/eGRID52793.2021.9662141","DOIUrl":"https://doi.org/10.1109/eGRID52793.2021.9662141","url":null,"abstract":"As the penetration rate of renewable energy in the utility grid increases, large-scale energy storage system (ESS) will become an essential infrastructure in the grid. Reversible solid oxide fuel cell (RSOFC) technology is a promising solution for large-scale ESS. However, the wide voltage range and low power of single RSOFC stack electrical characteristics have complicated the interface converter design. It is necessary to connect multiple stacks through a power conversion system to integrate the power because a single stack of RSOFC is small. This paper proposes a power conversion system for large-scale RSOFC ESS. The system consists of a cascaded H-bridge (CHB) converter and multiple multiport converters, and they are connected to a common dc bus. Because of the electrical characteristics of RSOFC, a two-stage CLLC based multiport converter topology is employed to achieve high voltage gain and operate at a wide voltage range. The control strategy of the proposed power conversion system is presented. Simulation tests verify the feasibility and effectiveness of the proposed conversion system","PeriodicalId":198321,"journal":{"name":"2021 6th IEEE Workshop on the Electronic Grid (eGRID)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115223207","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 : 2021-11-08DOI: 10.1109/eGRID52793.2021.9662152
Johannes Kuprat, Joscha Schaumburg, M. Langwasser, M. Liserre
The increasing number of electric vehicle charging stations and photovoltaic power plants makes the usage of LVdc grids more and more attractive. A Smart Transformer (ST) can provide dc connectivity, however, its multiple conversion stages can impair an efficient operation. To provide higher efficiency by offering different power paths an “interconnected“ architecture for the ST can be utilized for the connection of multiple isolated ac and dc grids. This work proposes a mission-profile based design procedure for a hybrid-grids feeding ST, which shows an inherent opportunity for downsizing of power converter rating and the capability of increased fault tolerance.
{"title":"Mission-Profile Based Design of a Hybrid-Grids Feeding Smart Transformer","authors":"Johannes Kuprat, Joscha Schaumburg, M. Langwasser, M. Liserre","doi":"10.1109/eGRID52793.2021.9662152","DOIUrl":"https://doi.org/10.1109/eGRID52793.2021.9662152","url":null,"abstract":"The increasing number of electric vehicle charging stations and photovoltaic power plants makes the usage of LVdc grids more and more attractive. A Smart Transformer (ST) can provide dc connectivity, however, its multiple conversion stages can impair an efficient operation. To provide higher efficiency by offering different power paths an “interconnected“ architecture for the ST can be utilized for the connection of multiple isolated ac and dc grids. This work proposes a mission-profile based design procedure for a hybrid-grids feeding ST, which shows an inherent opportunity for downsizing of power converter rating and the capability of increased fault tolerance.","PeriodicalId":198321,"journal":{"name":"2021 6th IEEE Workshop on the Electronic Grid (eGRID)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134252309","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 : 2021-11-08DOI: 10.1109/eGRID52793.2021.9662145
Muhammad F. Umar, Mohsen Hosseinzadehtaher, M. Shadmand
This paper presents a control scheme for enforcing coherency in a cluster of grid-forming inverters with heterogenous characteristics. Increasing penetration of distributive generation (DG) drives the conventional grid towards more complex structure and a new concept with heterogenous characteristics known as power electronics dominated grid (PEDG). Thus, it becomes more challenging to optimize and perform various analysis without an accurate model that mimics the large-scale networks dynamics. The aggregated and reduced-order models that accurately represent the full-scale network enables optimal coordination and computationally efficient stability assessment in real-time. However, the heterogenous characteristics of the inverter based DGs due to the different filter model parameters, inverter ratings and control algorithms poses a challenge to derive an accurate aggregated model. This paper proposes to acquire homogenous dynamic characteristics via coherency enforcement control to aggregate the cluster of grid-forming inverters into single equivalent model that can accurately predicts the dynamic of a PEDG cluster. The coherency in the dynamic response of the grid-forming inverters is realized by autonomously identifying and emulating an equivalent inertia. Various case studies are presented in this paper that validates the proposed enforcing coherency control scheme.
{"title":"Homogeneity Realization for Cluster of Heterogeneous Grid-forming Inverters","authors":"Muhammad F. Umar, Mohsen Hosseinzadehtaher, M. Shadmand","doi":"10.1109/eGRID52793.2021.9662145","DOIUrl":"https://doi.org/10.1109/eGRID52793.2021.9662145","url":null,"abstract":"This paper presents a control scheme for enforcing coherency in a cluster of grid-forming inverters with heterogenous characteristics. Increasing penetration of distributive generation (DG) drives the conventional grid towards more complex structure and a new concept with heterogenous characteristics known as power electronics dominated grid (PEDG). Thus, it becomes more challenging to optimize and perform various analysis without an accurate model that mimics the large-scale networks dynamics. The aggregated and reduced-order models that accurately represent the full-scale network enables optimal coordination and computationally efficient stability assessment in real-time. However, the heterogenous characteristics of the inverter based DGs due to the different filter model parameters, inverter ratings and control algorithms poses a challenge to derive an accurate aggregated model. This paper proposes to acquire homogenous dynamic characteristics via coherency enforcement control to aggregate the cluster of grid-forming inverters into single equivalent model that can accurately predicts the dynamic of a PEDG cluster. The coherency in the dynamic response of the grid-forming inverters is realized by autonomously identifying and emulating an equivalent inertia. Various case studies are presented in this paper that validates the proposed enforcing coherency control scheme.","PeriodicalId":198321,"journal":{"name":"2021 6th IEEE Workshop on the Electronic Grid (eGRID)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134579966","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 : 2021-11-08DOI: 10.1109/eGRID52793.2021.9662159
Jeanpierre D. Valentín Acevedo, E. Ortiz-Rivera, R. Darbali-Zamora
With increasing interest in renewable energy sources, there is a growing number of inverter-based devices that are being interconnected into the grid. This creates a challenge in terms of estimating the states of these devices. This paper presents the analysis of an observer for a single-phase inverter using the average model. The objective is to estimate the states (capacitor voltage and inductor current) of a 170 V inverter rated at 1 kVA and with a total harmonic distortion (THD) of less than 5 %. The proposed method uses the linear state-space equations of the inverter to determine if the system is observable. The type of transient response of the system will be determined using the open-loop transfer function. In order to find the values of the observer gain L, which makes the system stable, the Routh Hurwitz stability criterion is used. MATLAB/Simulink is used to simulate the state-space based single-phase inverter model. Simulation results that demonstrate the estimation of the single-phase inverter voltage and current are presented.
{"title":"Observability Analysis for a Single-Phase Inverter Using Linear State-Space Equations","authors":"Jeanpierre D. Valentín Acevedo, E. Ortiz-Rivera, R. Darbali-Zamora","doi":"10.1109/eGRID52793.2021.9662159","DOIUrl":"https://doi.org/10.1109/eGRID52793.2021.9662159","url":null,"abstract":"With increasing interest in renewable energy sources, there is a growing number of inverter-based devices that are being interconnected into the grid. This creates a challenge in terms of estimating the states of these devices. This paper presents the analysis of an observer for a single-phase inverter using the average model. The objective is to estimate the states (capacitor voltage and inductor current) of a 170 V inverter rated at 1 kVA and with a total harmonic distortion (THD) of less than 5 %. The proposed method uses the linear state-space equations of the inverter to determine if the system is observable. The type of transient response of the system will be determined using the open-loop transfer function. In order to find the values of the observer gain L, which makes the system stable, the Routh Hurwitz stability criterion is used. MATLAB/Simulink is used to simulate the state-space based single-phase inverter model. Simulation results that demonstrate the estimation of the single-phase inverter voltage and current are presented.","PeriodicalId":198321,"journal":{"name":"2021 6th IEEE Workshop on the Electronic Grid (eGRID)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127019888","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 : 2021-11-08DOI: 10.1109/eGRID52793.2021.9662129
W. J. Choy, G. Buticchi, A. Marquez, M. Galea, J. I. Leon
The increasing complexity of the embedded power electronics system for automotive applications has pushed engineers towards multiport converters to be able to integrate multiple energy sources into a single converter structure. This paper deals with the optimization of the dc link current for a specific multiport converter realized by an inverter and two dc-dc converters. A simplified model based on an interleaved boost converter and a voltage source inverter is used for the simulations. The selection of the optimal phase-shift between the PWM carriers of each converter allows for a marked decrease of the dc-link current, with obvious benefits in terms of capacitor current stress.
{"title":"Optimized Phase-Shift Control for dc-link Current Minimization in Automotive Multi Converter Applications","authors":"W. J. Choy, G. Buticchi, A. Marquez, M. Galea, J. I. Leon","doi":"10.1109/eGRID52793.2021.9662129","DOIUrl":"https://doi.org/10.1109/eGRID52793.2021.9662129","url":null,"abstract":"The increasing complexity of the embedded power electronics system for automotive applications has pushed engineers towards multiport converters to be able to integrate multiple energy sources into a single converter structure. This paper deals with the optimization of the dc link current for a specific multiport converter realized by an inverter and two dc-dc converters. A simplified model based on an interleaved boost converter and a voltage source inverter is used for the simulations. The selection of the optimal phase-shift between the PWM carriers of each converter allows for a marked decrease of the dc-link current, with obvious benefits in terms of capacitor current stress.","PeriodicalId":198321,"journal":{"name":"2021 6th IEEE Workshop on the Electronic Grid (eGRID)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116755872","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 : 2021-11-08DOI: 10.1109/eGRID52793.2021.9662157
B. Wen, Yuanyuan Rong, Qing Lin, Alok Kumar, B. Fan, Matthias Spieler, V. Centeno, R. Burgos
The flexible combined heat and power (F-CHP) is a concept proposed by the Department of Energy, United States. It enables cogeneration plants in small to mid-size manufacturing facilities as microgrid-controlled distributed energy resources (DER) for operation in local areas with high aggregated renewable energy penetration. This paper showcases a converter featuring modularity, scalability, and grid-support functionalities.
{"title":"A Modular Scalable SiC-based Flexible-Combined Heat and Power System Interface Converter with Small Capacitor and Advanced Grid-Support Functions","authors":"B. Wen, Yuanyuan Rong, Qing Lin, Alok Kumar, B. Fan, Matthias Spieler, V. Centeno, R. Burgos","doi":"10.1109/eGRID52793.2021.9662157","DOIUrl":"https://doi.org/10.1109/eGRID52793.2021.9662157","url":null,"abstract":"The flexible combined heat and power (F-CHP) is a concept proposed by the Department of Energy, United States. It enables cogeneration plants in small to mid-size manufacturing facilities as microgrid-controlled distributed energy resources (DER) for operation in local areas with high aggregated renewable energy penetration. This paper showcases a converter featuring modularity, scalability, and grid-support functionalities.","PeriodicalId":198321,"journal":{"name":"2021 6th IEEE Workshop on the Electronic Grid (eGRID)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116380594","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 : 2021-11-08DOI: 10.1109/eGRID52793.2021.9662153
Matthew Baker, Hassan Althuwaini, M. Shadmand
This paper presents an intelligent predictive control schemes that integrates model and data-driven schemes for enhancing the resiliency of grid-interactive inverters to mitigate the impact of dynamic grid condition on model-based control performance. Conventional model predictive control (MPC) techniques feature several advantages such as fast dynamic response, single loop optimization instead of cascaded control schemes, and several others that are enabled by enhancements in micro-controllers for control of power electronics converters. These inherent features of MPC enable design of control schemes with advance functionalities for grid-interactive inverters. MPC efficacy is highly dependent on prediction accuracy of control variables. The prediction accuracy for a predictive controlled grid-interactive inverter depends on many factors including the controller knowledge on filter model parameters and variation of grid impedance. The variation of grid impedance can impact the current prediction accuracy due to the effect of the equivalent impedance on the effective impedance the inverter experiences at its point of common coupling (PCC). The grid impedance variation is expected in future power electronics dominated grid (PEDG) with multiple point of common coupling (MPCC). The proposed resilient artificial intelligence (AI) inspired MPC scheme addresses these challenges towards improving the performance of grid-interactive inverters in PEDG. This is done through the introduction of a Learned Impedance Factor to the MPC cost formulation equation. In this paper an overview of the proposed integrated data-driven and model-based control scheme is provided, and results demonstrate the proposed controller improves the THD and tracking error compared to conventional MPC that is purely model-based.
{"title":"Resilient Model based Predictive Control Scheme Inspired by Artificial Intelligence Methods for Grid-Interactive Inverters","authors":"Matthew Baker, Hassan Althuwaini, M. Shadmand","doi":"10.1109/eGRID52793.2021.9662153","DOIUrl":"https://doi.org/10.1109/eGRID52793.2021.9662153","url":null,"abstract":"This paper presents an intelligent predictive control schemes that integrates model and data-driven schemes for enhancing the resiliency of grid-interactive inverters to mitigate the impact of dynamic grid condition on model-based control performance. Conventional model predictive control (MPC) techniques feature several advantages such as fast dynamic response, single loop optimization instead of cascaded control schemes, and several others that are enabled by enhancements in micro-controllers for control of power electronics converters. These inherent features of MPC enable design of control schemes with advance functionalities for grid-interactive inverters. MPC efficacy is highly dependent on prediction accuracy of control variables. The prediction accuracy for a predictive controlled grid-interactive inverter depends on many factors including the controller knowledge on filter model parameters and variation of grid impedance. The variation of grid impedance can impact the current prediction accuracy due to the effect of the equivalent impedance on the effective impedance the inverter experiences at its point of common coupling (PCC). The grid impedance variation is expected in future power electronics dominated grid (PEDG) with multiple point of common coupling (MPCC). The proposed resilient artificial intelligence (AI) inspired MPC scheme addresses these challenges towards improving the performance of grid-interactive inverters in PEDG. This is done through the introduction of a Learned Impedance Factor to the MPC cost formulation equation. In this paper an overview of the proposed integrated data-driven and model-based control scheme is provided, and results demonstrate the proposed controller improves the THD and tracking error compared to conventional MPC that is purely model-based.","PeriodicalId":198321,"journal":{"name":"2021 6th IEEE Workshop on the Electronic Grid (eGRID)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127106777","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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