IET Renewable Power Generation最新文献_第5页

Control strategy of frequency and DC voltage for interfacing converter of hybrid AC/DC microgrid based on improved virtual synchronous generator

IF 2.6 4区工程技术

IET Renewable Power Generation Pub Date : 2025-01-11 DOI: 10.1049/rpg2.13190

Sina Ashrafi, Seyed Ali Mousavi-Rozveh, Amir Khorsandi, Seyed Hossein Hosseinian

{"title":"Control strategy of frequency and DC voltage for interfacing converter of hybrid AC/DC microgrid based on improved virtual synchronous generator","authors":"Sina Ashrafi, Seyed Ali Mousavi-Rozveh, Amir Khorsandi, Seyed Hossein Hosseinian","doi":"10.1049/rpg2.13190","DOIUrl":"https://doi.org/10.1049/rpg2.13190","url":null,"abstract":"Integrating renewable resources in microgrids (MGs) poses a substantial challenge: ensuring stability with low inertia. This paper provides control techniques for the AC frequency and the DC voltage for an isolated/islanded hybrid AC/DC MG using intelligent virtual synchronous generators (VSGs) and intelligent virtual capacitors (VCs). The suggested approaches take advantage of VSG's adaptive damping coefficient and VC's adaptive virtual resistance as defined by intelligent controls. The controllers operate independently, relying solely on local DC voltage and AC frequency measurements without additional communication infrastructure. Compared to the traditional VSG and VC, the hybrid MG with intelligent VSG and VC controls performs better in suppressing AC frequency and DC voltage deviations, regardless of operating mode (rectifier or inverter). Simulation studies in MATLAB/Simulink validate these findings, showing that the artificial neural network (ANN) approach reduces DC voltage deviation by 34.4% and AC frequency deviation by 26.3%, while the fuzzy logic control (FLC) approach further reduces these deviations, particularly DC voltage deviation by 41.9% and AC frequency deviation by 23.2%. ANN excels in reducing deviations for AC frequency, while FLC is more effective in lowering deviations for DC voltage. The proposed controllers' positive impact on system stability is assessed using small-signal stability analysis.","PeriodicalId":55000,"journal":{"name":"IET Renewable Power Generation","volume":"19 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/rpg2.13190","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143114291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamic event-triggered-based adaptive frequency control of microgrids under cyber-attacks via adaptive dynamic programming

IF 2.6 4区工程技术

IET Renewable Power Generation Pub Date : 2025-01-04 DOI: 10.1049/rpg2.13187

Zemeng Mi, Hanguang Su, Qiuye Sun, Yuliang Cai, Zhongyang Ming

{"title":"Dynamic event-triggered-based adaptive frequency control of microgrids under cyber-attacks via adaptive dynamic programming","authors":"Zemeng Mi, Hanguang Su, Qiuye Sun, Yuliang Cai, Zhongyang Ming","doi":"10.1049/rpg2.13187","DOIUrl":"https://doi.org/10.1049/rpg2.13187","url":null,"abstract":"The increasing penetration of renewable energy sources (RES) and the development of the cyber-physical microgrids (CPMs) make greater demands for frequency control of microgrids. The common approach for frequency control is controlling the micro-turbine to compensate for frequency deviations, with energy storage systems serving as an auxiliary approach. This article proposes an online adaptive frequency control method to control the governor and energy storage to realize the frequency recovery of microgrid, subject to the external unknown disturbances caused by wind turbine, power load and false data injection (FDI) attacks. First, the non-zero sum (NZS) games of the considered system are modeled in this work, where the unknown disturbances are also taken into account. For the sake of estimating the unknown disturbances, a disturbance observer (DOB) for the microgrid system is introduced. Then, on the basis of the estimated results of the applied DOB, the disturbance compensation input is derived to offset the interference of the unknown disturbance. Meanwhile, the adaptive dynamic programming (ADP) approach is employed to derive the adaptive optimal control input for the NZS games of microgrid system. Besides, the dynamic event-triggered (DET) control is introduced, reducing the occupation of computing resources. By utilizing the Lyapunov's method, the stability of the closed-loop system, the convergence of the estimation weight, the estimation disturbances and the system state are guaranteed. The effectiveness of the proposed method is ultimately verified by the simulation results.","PeriodicalId":55000,"journal":{"name":"IET Renewable Power Generation","volume":"19 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/rpg2.13187","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143111986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Droop control strategy in inverter-based microgrids: A brief review on analysis and application in islanded mode of operation

IF 2.6 4区工程技术

IET Renewable Power Generation Pub Date : 2025-01-03 DOI: 10.1049/rpg2.13186

Ghazanfar Shahgholian, Mohammadreza Moradian, Arman Fathollahi

{"title":"Droop control strategy in inverter-based microgrids: A brief review on analysis and application in islanded mode of operation","authors":"Ghazanfar Shahgholian, Mohammadreza Moradian, Arman Fathollahi","doi":"10.1049/rpg2.13186","DOIUrl":"https://doi.org/10.1049/rpg2.13186","url":null,"abstract":"Droop control is at the first level of the control hierarchy and does not require communication. Having high reliability, is usually used in inverter-based microgrids. The microgrid can operate as an island, and it can also be connected to the main or auxiliary grid. By reviewing the extensive literature on the role of the controller in inverter-based microgrids for the island mode of operation, in this study, the droop regulation strategy has been covered briefly and compactly. Droop regulation is an example of decentralized regulation in basic control, and its importance is revealed in the island mode of operation when it is possible to share power in all facilities without needing to communicate with other units. Disadvantages of common droop control, such as slow transient dynamics and low energy quality for non-linear and unbalanced loads, have limited its use in advanced microgrids. Therefore, various methods to improve the common droop control have been investigated so far, some of which have been mentioned. This study highlights the application of droop control strategies in order to coordinate distributed generation units in the microgrid. About 180 published studies in this field have been reviewed, classified and indexed for quick reference.","PeriodicalId":55000,"journal":{"name":"IET Renewable Power Generation","volume":"19 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/rpg2.13186","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143111485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exergy analysis of isochoric and isobaric adiabatic compressed air energy storage

IF 2.6 4区工程技术

IET Renewable Power Generation Pub Date : 2025-01-03 DOI: 10.1049/rpg2.13184

Edward Barbour, Maury M. Oliveira Jr, Bruno Cardenas, Daniel Pottie

{"title":"Exergy analysis of isochoric and isobaric adiabatic compressed air energy storage","authors":"Edward Barbour, Maury M. Oliveira Jr, Bruno Cardenas, Daniel Pottie","doi":"10.1049/rpg2.13184","DOIUrl":"https://doi.org/10.1049/rpg2.13184","url":null,"abstract":"Adiabatic compressed air energy storage (ACAES) is an energy storage technology that has the potential to play an important role in the transition to a predominantly renewables-driven net-zero energy system. However, it has not yet achieved the performance necessary to be widely deployed. This paper undertakes an exergy analysis of isobaric and isochoric ACAES systems, tracking lost work through the components and exploring the influences of different design choices. Three different configurations are modelled: (1) 3 compression and 3 expansion stages; (2) 4 compression and 2 expansion stages; and (3) 2 compression and 4 expansion stages. These results illustrate that isobaric systems are likely to have higher round-trip efficiency and significantly higher energy density, at the cost of achieving isobaric storage. Exergy analysis reveals that most of the losses arise in the compressors, compressor aftercoolers and expanders. Losses in aftercoolers are exaggerated when compressors operate with high-pressure ratios, emphasizing that the choice of TES is a key system variable. With pressurised water as the coolant and TES fluid, it seems likely that the best system will have more compression than expansion stages. Increasing the number of compression stages decreases the off-design penalty when the system is isochoric.","PeriodicalId":55000,"journal":{"name":"IET Renewable Power Generation","volume":"19 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/rpg2.13184","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143111486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Determination of optimal island regions with simultaneous DG allocation and reconfiguration in power distribution networks

IF 2.6 4区工程技术

IET Renewable Power Generation Pub Date : 2025-01-03 DOI: 10.1049/rpg2.12942

Murat Cikan, Nisa Nacar Cikan, Bedri Kekezoglu

{"title":"Determination of optimal island regions with simultaneous DG allocation and reconfiguration in power distribution networks","authors":"Murat Cikan, Nisa Nacar Cikan, Bedri Kekezoglu","doi":"10.1049/rpg2.12942","DOIUrl":"https://doi.org/10.1049/rpg2.12942","url":null,"abstract":"The rising demand for electric energy and environmental pollution concerns have led to using renewable energy-based distributed generators (DGs) in power distribution networks (PDN). However, the power flow may become bidirectional (non-radial) by introducing the DGs into the system, which may cause instability in the system's operation. System instability causes an increase in system losses and implies a rising in costs. This paper proposes a methodology using Moth Flame Optimizer and Equilibrium Optimizer to reconfigure the PDN, optimizing the siting, sizing, and power factor of multiple DGs to maintain radial mode operation. Determining DGs' allocation within a radial system by optimizing multi-parameters simultaneously leads to minimizing losses, enhancing reliability, and improving the stability of the network. Thus, the number of affected customers in a catastrophic power outage or emergency blackout scenarios can be minimized. The method has been tested on a 33-bus distribution system where four different scenarios with three cases for each are studied to show the performance of the proposed method. The method's effectiveness is demonstrated by minimizing power loss, enhancing the voltage stability index, assuring reliability, and improving the voltage profile. Moreover, the accuracy of reliability index calculation results is confirmed with the commercial software ETAP.","PeriodicalId":55000,"journal":{"name":"IET Renewable Power Generation","volume":"19 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/rpg2.12942","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143111487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reactive power valuation for DFIGs based on power loss and power capacity limitations

IF 2.6 4区工程技术

IET Renewable Power Generation Pub Date : 2025-01-02 DOI: 10.1049/rpg2.13189

Fazel Pourmirzaei Deylami, Ahmad Darabi

引用次数: 0

The question of thermoelectric devices (TEDs) in/efficiency—A practical research considering thermoelectric generators (TEGs)

IF 2.6 4区工程技术

IET Renewable Power Generation Pub Date : 2024-12-23 DOI: 10.1049/rpg2.13185

Nganyang Paul Bayendang, Vipin Balyan, Mohamed Tariq Kahn

{"title":"The question of thermoelectric devices (TEDs) in/efficiency—A practical research considering thermoelectric generators (TEGs)","authors":"Nganyang Paul Bayendang, Vipin Balyan, Mohamed Tariq Kahn","doi":"10.1049/rpg2.13185","DOIUrl":"https://doi.org/10.1049/rpg2.13185","url":null,"abstract":"Thermoelectricity is a versatile clean energy technology; however, its in/efficiency has been a question of debate. Thus, this practical study focuses on thermoelectric devices' (TEDs') performance when operated as thermoelectric generators (TEGs). Sixteen identical TEDs (TEC-12706 of the same made and model) were operated as TEGs under the same experimental setup and test modalities with a hotside temperature between ∼20°C and ∼100°C and a coldside temperature of ∼20°C, to practically and comparatively examine the TEGs voltage production and energy conversion in/efficiency. The findings revealed that, while it's already common knowledge that a TEG output voltage is proportional to its temperature difference as evident in all the TEGs used in the study; however, as the TEGs temperature difference proportionally increases, some of the TEGs relatively produced less, the same and more output voltages at certain temperature differences compared to others. For example, TEG1 and TEG3 produced almost the same output voltages throughout; however, at ∼100°C hotside temperature, TEG3 produced 3.16 V, whereas TEG1 produced 2.90 V. While such widespread TEGs discrepancies can be mostly attributed to bad manufacturing/poor workmanship, they are usually misconstrued by some as a generic inherent thermoelectricity technology limitations which this study highlights.","PeriodicalId":55000,"journal":{"name":"IET Renewable Power Generation","volume":"19 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/rpg2.13185","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143118510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparison of frequency domain models for assessing the harmonic emissions of low voltage photovoltaic systems

IF 2.6 4区工程技术

IET Renewable Power Generation Pub Date : 2024-12-18 DOI: 10.1049/rpg2.13152

Antonio Bracale, Adam J. Collin, Muhammad Ishaq, Roberto Langella

引用次数: 0

The long-term influence of wind and temperature on performance and degradation within an utility-scale photovoltaic plant

IF 2.6 4区工程技术

IET Renewable Power Generation Pub Date : 2024-12-16 DOI: 10.1049/rpg2.13182

Francisca Muriel Daniel-Durandt, Arnold Johan Rix

{"title":"The long-term influence of wind and temperature on performance and degradation within an utility-scale photovoltaic plant","authors":"Francisca Muriel Daniel-Durandt, Arnold Johan Rix","doi":"10.1049/rpg2.13182","DOIUrl":"https://doi.org/10.1049/rpg2.13182","url":null,"abstract":"An inverter-level analysis of a large photovoltaic (PV) plant is evaluated over four years to investigate the long-term performance and degradation caused by wind and temperature effects. The multi-megawatt utility-scale PV plant is located in a semi-arid region in South Africa. The degradation rate is determined using the performance ratio as a comparison metric between the different inverters. The degradation from the first year of operation up to the fourth year shows that different areas of the PV plant have varying degradation rates. The spatial degradation analysis indicates that inverter blocks operating at higher ambient temperatures and lower wind frequency measurements show higher rates of degradation compared to inverter groups operating at lower temperatures and higher wind frequency. Notably, the lowest degradation rates correlate positively with wind direction and frequency from the North and North-East, indicative of a cooling influence on the PV modules. The weather-corrected performance analysis indicates that the most prominent wind direction (North) has the highest mean performance ratio, further supporting the claims that the cooling effect of wind improves performance and efficiency. The widening gap between the best- and worst-performing inverters annually underscores the premise that specific inverters' PV modules degrade at disparate rates within the PV plant. The results of this work present future designs of PV plants that could potentially be optimised to take advantage of wind as a cooling tool, which may further enhance the longevity and sustainability of large PV installations.","PeriodicalId":55000,"journal":{"name":"IET Renewable Power Generation","volume":"19 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/rpg2.13182","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143115546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Large disturbance stability analysis method for DC microgrid with virtual DC motor control

IF 2.6 4区工程技术

IET Renewable Power Generation Pub Date : 2024-12-13 DOI: 10.1049/rpg2.13179

Fengzhan Zhao, Ting Liu, Yuntao Ju, Hong Li

{"title":"Large disturbance stability analysis method for DC microgrid with virtual DC motor control","authors":"Fengzhan Zhao, Ting Liu, Yuntao Ju, Hong Li","doi":"10.1049/rpg2.13179","DOIUrl":"https://doi.org/10.1049/rpg2.13179","url":null,"abstract":"Mixed potential theory is frequently employed for analysing large-disturbance stability. The precision of the current stability criterion for DC microgrids controlled by virtual DC motors (VDCM), which relies on mixed potential theory, is inadequate. This is primarily because the criterion does not account for the control parameters of the DC bus voltage control link and the virtual DC motor link. To address these issues, the paper initially formulates the control aspect of the VDCM using a controlled current source. Subsequently, it derives the system's mixed potential function from the model, enabling the development of a stability criterion that includes the control parameters of the DC bus voltage control link, the virtual DC motor link, and the current tracking link. It also clarifies how parameters not directly included in the criterion affect system stability. Through simulations and experimental validations, it is demonstrated that the proposed stability criterion effectively captures the impact of control parameters on system stability and precisely delineates the system's power stability boundary, offering insights for system parameter optimization.","PeriodicalId":55000,"journal":{"name":"IET Renewable Power Generation","volume":"18 S1","pages":"4689-4706"},"PeriodicalIF":2.6,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/rpg2.13179","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143252588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0