The rapid technological improvements concerning the renewable energy sources and the energy policy of the European Union, and the National Energy Strategy are leading to a rapid increase in the number of intermittent renewable power plants. Thus, new challenges emerge in the operation of the distribution system. To operate the system efficiently, the use of innovative technologies must be considered, because conventional network development strategies cannot always provide an optimal solution for the problem. This paper analyses the effects of largescale wind power generation on a medium voltage system and a solution of the problems faced through a case study of a serial voltage regulator. The difference between the profiles of generation and loads causes the residential transformers at the end of the line to encounter large, more than 8% voltage fluctuation. To assess the site’s voltage profile, time series symmetrical load flow calculations were performed. After the thorough analysis of the circumstances a serial voltage regulator device was implemented at 3 different nodes of the system and a placement analysis was carried out with statistical tools. The results showed a 3% decrease in the voltage fluctuation at the end of the line even when the device was far from these nodes; and with an optimal placement, the device could halve the largest voltage fluctuation on the line.
{"title":"The use of innovative tools in the medium voltage grid development, a case study of series voltage regulator","authors":"B. Tőzsér, I. Táczi, A. Torok","doi":"10.24084/repqj21.409","DOIUrl":"https://doi.org/10.24084/repqj21.409","url":null,"abstract":"The rapid technological improvements concerning the renewable energy sources and the energy policy of the European Union, and the National Energy Strategy are leading to a rapid increase in the number of intermittent renewable power plants. Thus, new challenges emerge in the operation of the distribution system. To operate the system efficiently, the use of innovative technologies must be considered, because conventional network development strategies cannot always provide an optimal solution for the problem. This paper analyses the effects of largescale wind power generation on a medium voltage system and a solution of the problems faced through a case study of a serial voltage regulator. The difference between the profiles of generation and loads causes the residential transformers at the end of the line to encounter large, more than 8% voltage fluctuation. To assess the site’s voltage profile, time series symmetrical load flow calculations were performed. After the thorough analysis of the circumstances a serial voltage regulator device was implemented at 3 different nodes of the system and a placement analysis was carried out with statistical tools. The results showed a 3% decrease in the voltage fluctuation at the end of the line even when the device was far from these nodes; and with an optimal placement, the device could halve the largest voltage fluctuation on the line.","PeriodicalId":21076,"journal":{"name":"Renewable Energy and Power Quality Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82807066","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}
Z. Mokrani, Djamila Rekioua, N. Mebarki, A. Oubelaid, K. Kakouche, T. Rekioua
This paper is presented in regard to the interesting continuous interest attributed to photovoltaic energy systems (PESs). To this aim, a study of an isolated photovoltaic system with hybrid storage (HS) is presented. Supercapacitors (SCs) are typically used because of their high specific power density.. Combining batteries and supercapacitors is a solution to maximize their benefits. In this work, the HS is a combinaison of batteries and supercapacitors. The goal of this work is to build a new management algorithm. This aforementioned technique will ensure the control of energy flow between system power sources. Furthermore, it will regulate the charge/discharge cycles of the proposed HS by maintaining their state of charge (SOC) between a desired minimum and maximum values. The proposed method is simple, efficient and it is not computationally heavy. The obtained simulation results are satisfactory and show the interest and effectiveness of the proposed management strategy.
{"title":"Power management strategy for photovoltaic system with hybrid storage (Batteries/Supercapacitors)","authors":"Z. Mokrani, Djamila Rekioua, N. Mebarki, A. Oubelaid, K. Kakouche, T. Rekioua","doi":"10.24084/repqj21.343","DOIUrl":"https://doi.org/10.24084/repqj21.343","url":null,"abstract":"This paper is presented in regard to the interesting continuous interest attributed to photovoltaic energy systems (PESs). To this aim, a study of an isolated photovoltaic system with hybrid storage (HS) is presented. Supercapacitors (SCs) are typically used because of their high specific power density.. Combining batteries and supercapacitors is a solution to maximize their benefits. In this work, the HS is a combinaison of batteries and supercapacitors. The goal of this work is to build a new management algorithm. This aforementioned technique will ensure the control of energy flow between system power sources. Furthermore, it will regulate the charge/discharge cycles of the proposed HS by maintaining their state of charge (SOC) between a desired minimum and maximum values. The proposed method is simple, efficient and it is not computationally heavy. The obtained simulation results are satisfactory and show the interest and effectiveness of the proposed management strategy.","PeriodicalId":21076,"journal":{"name":"Renewable Energy and Power Quality Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86153905","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}
C. Andrada-Monrós, E. Peñalvo-López, I. Valencia-Salazar, J. Cárcel-Carrasco
Initiatives have been launched by the EU to address climate change, including those aimed at islands and municipalities. Analysing the impact of the energy transition through modelling is essential for the strategic decision-making process to move forward to the ET. The new energy model requires municipalities to be key drivers, although their needs are very specific and depend on external factors such as their own governance. In the case of municipalities located on tourist islands, the need for tools and support for the creation of energy and sustainable transition plans is even more evident. Currently, methods and models have been developed for energy planning or for the assessment of different energy scenarios, but there is no model that integrates a multidimensional approach at the municipal level, enhances the decisions of policymakers, integrates a knowledge base specifically focused on islands and monitors the progress of local measures through energy indicators. This paper reviews the state of existing decisionmaking models and energy tools, specifically those aimed at islands and policymakers, and identifies the gaps to generate added value to facilitate the path to ET for island tourist municipalities and monitor their progress.
{"title":"Review of the Energy transition assessment methods in touristic municipalities","authors":"C. Andrada-Monrós, E. Peñalvo-López, I. Valencia-Salazar, J. Cárcel-Carrasco","doi":"10.24084/repqj21.348","DOIUrl":"https://doi.org/10.24084/repqj21.348","url":null,"abstract":"Initiatives have been launched by the EU to address climate change, including those aimed at islands and municipalities. Analysing the impact of the energy transition through modelling is essential for the strategic decision-making process to move forward to the ET. The new energy model requires municipalities to be key drivers, although their needs are very specific and depend on external factors such as their own governance. In the case of municipalities located on tourist islands, the need for tools and support for the creation of energy and sustainable transition plans is even more evident. Currently, methods and models have been developed for energy planning or for the assessment of different energy scenarios, but there is no model that integrates a multidimensional approach at the municipal level, enhances the decisions of policymakers, integrates a knowledge base specifically focused on islands and monitors the progress of local measures through energy indicators. This paper reviews the state of existing decisionmaking models and energy tools, specifically those aimed at islands and policymakers, and identifies the gaps to generate added value to facilitate the path to ET for island tourist municipalities and monitor their progress.","PeriodicalId":21076,"journal":{"name":"Renewable Energy and Power Quality Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80661010","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}
The paper presents the possibility of the output voltage control of an OVT inverter. The idea of the OVT inverter construction is based on the orthogonal space vectors theory. The OVT inverter is built of two components two-level three-phase inverters: the main inverter (MI) and the auxiliary one (AI). The output voltage of the OVT inverter takes the shape of a stepped voltage analogous to the voltage generated by multilevel inverters. The paper demonstrates possible control methods of the output voltage frequency and amplitude. The results obtained during simulation studies prove that the output voltage essential parameters may be a function of the DC voltage and the control circuitry permits easy defining a selection of voltage/frequency characteristics.
{"title":"Output voltage control of the OVT inverter","authors":"J. Iwaszkiewicz, A. Muc","doi":"10.24084/repqj21.456","DOIUrl":"https://doi.org/10.24084/repqj21.456","url":null,"abstract":"The paper presents the possibility of the output voltage control of an OVT inverter. The idea of the OVT inverter construction is based on the orthogonal space vectors theory. The OVT inverter is built of two components two-level three-phase inverters: the main inverter (MI) and the auxiliary one (AI). The output voltage of the OVT inverter takes the shape of a stepped voltage analogous to the voltage generated by multilevel inverters. The paper demonstrates possible control methods of the output voltage frequency and amplitude. The results obtained during simulation studies prove that the output voltage essential parameters may be a function of the DC voltage and the control circuitry permits easy defining a selection of voltage/frequency characteristics.","PeriodicalId":21076,"journal":{"name":"Renewable Energy and Power Quality Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83284299","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}
Pablo Horrillo-Quintero, Pablo García-Triviño, Raúl Sarrias-Mena, C. García-Vázquez, Luis M. Fernández‐Ramírez
In recent years, Quasi-Z-source cascaded H-bridge multilevel inverters (qZS-CHBMLIs) have become an interesting solution for integrating renewable energy into the utility grid. The possibility of performing power conversion in a single stage, without an additional DC/DC converter, and a higher voltage gain, are their main advantages over traditional inverters. In addition, individual control of the maximum power point tracking (MPPT) can be achieved for each PV plant. Owing to the intermittent nature of PV power plants, battery energy storage systems (BESS) are commonly used to smooth out PV power fluctuations. This paper presents a control system for the active and reactive power delivered to the grid according to the system operator references and an EMS for an ES-qZS-CHBMLI. The BESS is coordinated through an energy management system (EMS) based on the state of charge (SOC) The system is evaluated under two different operation modes. One of them, where the PV power plants operate according to their MPP and the other in which the MPPT faults and thus, the PV power is decreased. A MATLAB-Simulink simulation is used to validate the proposed control system for a grid-connected single-phase configuration based on a qZSCHBMLI with three cascade qZSI, each connected to a 4.8 kW PV power plant and a BESS.
{"title":"Power Sharing Control for a Microgrid with PV Power Plants, Batteries and Quasi-Z-source Cascaded H-bridge Multilevel Inverter","authors":"Pablo Horrillo-Quintero, Pablo García-Triviño, Raúl Sarrias-Mena, C. García-Vázquez, Luis M. Fernández‐Ramírez","doi":"10.24084/repqj21.457","DOIUrl":"https://doi.org/10.24084/repqj21.457","url":null,"abstract":"In recent years, Quasi-Z-source cascaded H-bridge multilevel inverters (qZS-CHBMLIs) have become an interesting solution for integrating renewable energy into the utility grid. The possibility of performing power conversion in a single stage, without an additional DC/DC converter, and a higher voltage gain, are their main advantages over traditional inverters. In addition, individual control of the maximum power point tracking (MPPT) can be achieved for each PV plant. Owing to the intermittent nature of PV power plants, battery energy storage systems (BESS) are commonly used to smooth out PV power fluctuations. This paper presents a control system for the active and reactive power delivered to the grid according to the system operator references and an EMS for an ES-qZS-CHBMLI. The BESS is coordinated through an energy management system (EMS) based on the state of charge (SOC) The system is evaluated under two different operation modes. One of them, where the PV power plants operate according to their MPP and the other in which the MPPT faults and thus, the PV power is decreased. A MATLAB-Simulink simulation is used to validate the proposed control system for a grid-connected single-phase configuration based on a qZSCHBMLI with three cascade qZSI, each connected to a 4.8 kW PV power plant and a BESS.","PeriodicalId":21076,"journal":{"name":"Renewable Energy and Power Quality Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90901584","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}
In the Hungarian electricity system, as well as in other European countries, the share of renewable based production is increasing. These power generating modules do not contain rotating masses like those of traditional synchronous power generating modules which creates new challenges on the electric grid with respect to system stability and frequency control. The distribution system operators (DSOs) of the different countries need to cope with this problem and set frequency, voltage thresholds and robustness requirements for the electricity generating power plants. This project aims to create specific requirements for the Hungarian generators considering the former implementations of other countries (UK, Germany, Denmark and Finland). The different requirements of these foreign areas are introduced in a benchmark study, which is the first essential part of the whole project. Such implementations are only partially defined for Hungary; therefore, in some cases it is necessary to use the implementations of other foreign countries which have similar grid characteristics and are dealing with the same control and operation challenges. Another important milestone of this work besides the benchmark study is to present a validation guide for the Hungarian transmission system operator (TSO) that can be sent directly to the operators of electric power generating modules with six different types. These guides contain compliance tests for the power plants to examine whether they meet the requirements of grid connection or not.
{"title":"A Benchmark and Validation Guide for the Hungarian Implementation of the Common European Requirements for Electricity Generators","authors":"I. Vokony","doi":"10.24084/repqj21.288","DOIUrl":"https://doi.org/10.24084/repqj21.288","url":null,"abstract":"In the Hungarian electricity system, as well as in other European countries, the share of renewable based production is increasing. These power generating modules do not contain rotating masses like those of traditional synchronous power generating modules which creates new challenges on the electric grid with respect to system stability and frequency control. The distribution system operators (DSOs) of the different countries need to cope with this problem and set frequency, voltage thresholds and robustness requirements for the electricity generating power plants. This project aims to create specific requirements for the Hungarian generators considering the former implementations of other countries (UK, Germany, Denmark and Finland). The different requirements of these foreign areas are introduced in a benchmark study, which is the first essential part of the whole project. Such implementations are only partially defined for Hungary; therefore, in some cases it is necessary to use the implementations of other foreign countries which have similar grid characteristics and are dealing with the same control and operation challenges. Another important milestone of this work besides the benchmark study is to present a validation guide for the Hungarian transmission system operator (TSO) that can be sent directly to the operators of electric power generating modules with six different types. These guides contain compliance tests for the power plants to examine whether they meet the requirements of grid connection or not.","PeriodicalId":21076,"journal":{"name":"Renewable Energy and Power Quality Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83928484","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}
Nowadays, the use of inverters is increasing in more and more applications. Environmental awareness is becoming a trend, so more and more people install solar energy systems on their houses, which also require the use of inverters. Higher power levels have led to the emergence of three-level inverters which has opened up new challenges, such as the issue of midpoint voltage balancing. This paper discusses voltage balancing and voltage ripple reduction techniques for three-level inverters with Neutral-Point Clamped (NPC) topology. The balancing is based on injecting zero-sequence voltage component in carrierbased modulation. The viability of the modulation techniques are verified by computer simulation and then tested on hardware.
{"title":"Development and testing midpoint voltage balance algorithms of three-level inverters","authors":"L. Stranyóczky, A. Balogh, Z. Sütő, I. Varjasi","doi":"10.24084/repqj21.382","DOIUrl":"https://doi.org/10.24084/repqj21.382","url":null,"abstract":"Nowadays, the use of inverters is increasing in more and more applications. Environmental awareness is becoming a trend, so more and more people install solar energy systems on their houses, which also require the use of inverters. Higher power levels have led to the emergence of three-level inverters which has opened up new challenges, such as the issue of midpoint voltage balancing. This paper discusses voltage balancing and voltage ripple reduction techniques for three-level inverters with Neutral-Point Clamped (NPC) topology. The balancing is based on injecting zero-sequence voltage component in carrierbased modulation. The viability of the modulation techniques are verified by computer simulation and then tested on hardware.","PeriodicalId":21076,"journal":{"name":"Renewable Energy and Power Quality Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78109171","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}
Together with the daily variation of load demand in power grids, the continuous integration of offshore and onshore wind farms to feed the grid with green energy has recently led to a severe frequency stability issue due to the extra variation in the generation side. Hence, wind turbines (WTs), among other renewable energy units are required to regulate their output power to mitigate the fluctuation in generated power and support frequency stability. In this paper, model predictive control (MPC) is implemented in an adaptive way to operate WT in de-loading mode under wind disturbances. In addition, to get comprehensive operation of WTs and meet grid code requirements; we present a new grid-forming controller in the WT rotor side converter to emulate the inherent synchronizing and load sharing property of conventional generators. The limitations of rotor speed and rotor side converter are considered in the proposed control approach.
{"title":"Optimal active power control of wind turbines in grid-forming mode","authors":"Bashar Mousa Melhem, Steven Liu","doi":"10.24084/repqj21.220","DOIUrl":"https://doi.org/10.24084/repqj21.220","url":null,"abstract":"Together with the daily variation of load demand in power grids, the continuous integration of offshore and onshore wind farms to feed the grid with green energy has recently led to a severe frequency stability issue due to the extra variation in the generation side. Hence, wind turbines (WTs), among other renewable energy units are required to regulate their output power to mitigate the fluctuation in generated power and support frequency stability. In this paper, model predictive control (MPC) is implemented in an adaptive way to operate WT in de-loading mode under wind disturbances. In addition, to get comprehensive operation of WTs and meet grid code requirements; we present a new grid-forming controller in the WT rotor side converter to emulate the inherent synchronizing and load sharing property of conventional generators. The limitations of rotor speed and rotor side converter are considered in the proposed control approach.","PeriodicalId":21076,"journal":{"name":"Renewable Energy and Power Quality Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80344110","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}
F. Nuñez, G. Magallanes, L. Pacheco, N. Luo, J. Vila
The PWRLINKCAR (Power Link Caribbean) is a research project that has the aim of promoting the renewable energies in the Caribbean area. The use of a submarine cable is proposed for the union of the electric markets of Greater and Lesser Antilles. The goal of the project is to extend the renewable energies to the markets of the Caribbean Area by studying, designing, and modelling the interconnectivity of the markets. It is proposed the use of direct current in order to transmit the electricity energy power using HVDC (High Voltage Direct Current) and HVAC (High Voltage Alternating Current) through submarine cables. Regulatory provisions of the different markets are considered. Energy stocks and electricity price reduction are benefits expected by implementing the power link proposed in this work. Moreover, the power link can include optical cable for promoting telecommunications possibilities in the Caribbean area.
PWRLINKCAR (Power Link Caribbean)是一个旨在促进加勒比地区可再生能源发展的研究项目。建议为大安的列斯群岛和小安的列斯群岛的电力市场联合使用海底电缆。该项目的目标是通过研究、设计和模拟市场的互联性，将可再生能源扩展到加勒比地区的市场。提出利用直流技术，通过海底电缆传输HVDC (High Voltage direct current)和HVAC (High Voltage Alternating current)的电能。考虑了不同市场的监管规定。能源库存和电价下降是实施本工作提出的电力链路预期的效益。此外，电力连接可以包括光缆，以促进加勒比地区的电信可能性。
{"title":"The Power Link Caribbean Project","authors":"F. Nuñez, G. Magallanes, L. Pacheco, N. Luo, J. Vila","doi":"10.24084/repqj21.318","DOIUrl":"https://doi.org/10.24084/repqj21.318","url":null,"abstract":"The PWRLINKCAR (Power Link Caribbean) is a research project that has the aim of promoting the renewable energies in the Caribbean area. The use of a submarine cable is proposed for the union of the electric markets of Greater and Lesser Antilles. The goal of the project is to extend the renewable energies to the markets of the Caribbean Area by studying, designing, and modelling the interconnectivity of the markets. It is proposed the use of direct current in order to transmit the electricity energy power using HVDC (High Voltage Direct Current) and HVAC (High Voltage Alternating Current) through submarine cables. Regulatory provisions of the different markets are considered. Energy stocks and electricity price reduction are benefits expected by implementing the power link proposed in this work. Moreover, the power link can include optical cable for promoting telecommunications possibilities in the Caribbean area.","PeriodicalId":21076,"journal":{"name":"Renewable Energy and Power Quality Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90823297","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}
The classic energy supply system is mainly based on the stabilising properties of electromechanical synchronous generators. The structural change of the electrical energy supply system towards a decentralised grid structure means that ancillary services must now also be provided at the distribution grid level. The Virtual Synchronous Machine (VISMA) was developed at the Institute of Electrical Power Engineering at the Clausthal University of Technology with the aim of making a decentralised generation unit in the grid behave like a real synchronous machine and thus actively provide relevant ancillary services. The VISMA is based on a three-phase inverter that can comply with grid requirements by adding an energy storage device in the DC link and using a special control algorithm. The focus of the investigations shown here is on the uninterrupted transition from grid-parallel operation of the VISMA to island grid operation and the subsequent stable continued operation of this island grid. A controller changeover, as most feed-in inverters would require in order to change the operating mode, is not necessary here. It is shown that the transients have subsided after 5 ms, which means that the VISMA has completely taken over the
{"title":"Verification of the uninterrupted transition from grid parallel to island grid operation of the Virtual Synchronous Machine in a microgrid","authors":"Steven Reineke, D. Turschner, I. Hauer, H. Beck","doi":"10.24084/repqj21.236","DOIUrl":"https://doi.org/10.24084/repqj21.236","url":null,"abstract":"The classic energy supply system is mainly based on the stabilising properties of electromechanical synchronous generators. The structural change of the electrical energy supply system towards a decentralised grid structure means that ancillary services must now also be provided at the distribution grid level. The Virtual Synchronous Machine (VISMA) was developed at the Institute of Electrical Power Engineering at the Clausthal University of Technology with the aim of making a decentralised generation unit in the grid behave like a real synchronous machine and thus actively provide relevant ancillary services. The VISMA is based on a three-phase inverter that can comply with grid requirements by adding an energy storage device in the DC link and using a special control algorithm. The focus of the investigations shown here is on the uninterrupted transition from grid-parallel operation of the VISMA to island grid operation and the subsequent stable continued operation of this island grid. A controller changeover, as most feed-in inverters would require in order to change the operating mode, is not necessary here. It is shown that the transients have subsided after 5 ms, which means that the VISMA has completely taken over the","PeriodicalId":21076,"journal":{"name":"Renewable Energy and Power Quality Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90205896","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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