IET Renewable Power Generation最新文献

{"title":"DRU-HVDC for offshore wind power transmission: A review","authors":"Lujie Yu,&nbsp;Ziyu Fu,&nbsp;Rui Li,&nbsp;Jiebei Zhu","doi":"10.1049/rpg2.13045","DOIUrl":"10.1049/rpg2.13045","url":null,"abstract":"<p>The rapid development of offshore wind farms (OWFs) calls for economical and reliable power transmission technology. This review paper focuses on the diode-rectifier-unit based high voltage direct current (DRU-HVDC) transmission systems. The main technical features of DRU-HVDC are highlighted and the comparisons with MMC-HVDC and LCC-HVDC are conducted. Considering the uncontrollability of DRU and the necessity of offshore wind turbines (WTs) to establish offshore network, the existing decentralized and centralized control strategies are reviewed in detail. For the fully-grid-forming converter, the operation principle of the <i>P</i>–<i>V</i> and <i>Q</i>–<i>f</i> power control is explained from the OWF-DRU level and the WT level, respectively. For the partial-grid-forming converter, why the voltage control loop can be eliminated is analysed. Focusing on the start-up issue caused by the unidirectional-power-flow characteristic of DRU, several start-up solutions are reviewed, including medium voltage alternative current (MVAC) umbilical cable, auxiliary MMC, energy storage for WTs, auxiliary low voltage DC cable. Then considering different fault locations, the fault characteristic and protection of the DRU-HVDC system is presented, including the offshore AC faults, DRU faults, HVDC faults and onshore AC faults. Finally, the future research topics worth exploring for DRU-HVDC system are identified.</p>","PeriodicalId":55000,"journal":{"name":"IET Renewable Power Generation","volume":"18 13","pages":"2080-2101"},"PeriodicalIF":2.6,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/rpg2.13045","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141827532","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}

{"title":"Impact of translator mass and buoy choice on a power absorption of point absorbing wave energy converter linear generator with linear generator power take off","authors":"Tatiana Potapenko,&nbsp;Cecilia Boström,&nbsp;Irina Temiz","doi":"10.1049/rpg2.13046","DOIUrl":"10.1049/rpg2.13046","url":null,"abstract":"<p>Ocean waves have the potential to contribute to future renewable electricity production. A wave energy converter (WEC) is a technology developed to absorb the energy of the wave and convert it to another form of energy. The Uppsala University WEC (UU WEC) is a point absorber with a direct drive permanent magnet synchronous linear generator power take off. Among other parameters affecting the value of absorbed power for UU WEC are the buoy size, mass of the system consisting of the buoy and translator, and available wave energy at the site of interest. This study reviews the earlier static model that considered only static forces as the buoyancy and gravity forces and neglected all dynamic forces. The static model was proposed to simplify the early-stage design decision. Although the static model was applied to two UU WECs of different dimensions, the present study shows that the static model is not held for certain buoy and translator dimensions. As an alternative, the dynamic model which accounts for the impact of hydrodynamic forces and various translator masses is proposed. The dynamic model is based on Cummins' equation and the linear potential flow theory, and the damping force is approximated as a viscous damper with the constant damping coefficient optimizing the absorbed mechanical power under a particular sea condition. The dynamic model is applied to four fixed buoy geometries of two shapes (cylinder and cylinder with a moonpool), each of two different dimensions, but the method can be extended to other buoy shapes and dimensions. In addition, the impact of translator mass was assessed for two sites located on the west coast of Sweden and near Gran Canaria, Spain. A translator of 10–11 t promotes 16.8% higher annual average power absorption for a cylindrical buoy compared to a translator of 6 t for the same buoy. However, heavier translators up to 15 t provide only 1.1% increase in average annual absorbed power.</p>","PeriodicalId":55000,"journal":{"name":"IET Renewable Power Generation","volume":"18 11","pages":"1832-1845"},"PeriodicalIF":2.6,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/rpg2.13046","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141650081","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}

{"title":"Model-free predictive rotor current control of DFIGs based on an adaptive ultra-local model under nonideal power grids","authors":"Tao Jiang,&nbsp;Yongchang Zhang,&nbsp;Shengan Zhang,&nbsp;Shengnan Li","doi":"10.1049/rpg2.13053","DOIUrl":"10.1049/rpg2.13053","url":null,"abstract":"<p>The traditional control method of doubly fed induction generators (DFIGs) has poor robustness due to the excessive use of machine parameters, and does not fully consider the control conditions of nonideal power grids, resulting in serious fluctuations in current and power under grid disturbances. To solve these problems, model-free predictive rotor current control (MFPRCC) based on an ultra-local model is proposed in this article. The ultra-local model is adaptive because it can accurately emulate the overall structure of the system and estimate the total disturbance of the system in real time. Under a nonideal grid, the cascaded delayed signal cancellation (CDSC) modules are connected in series behind the outer power loop to extract the fundamental component of the rotor current reference. The proposed method is compared with the traditional model predictive rotor current control (MPRCC) method, and the effectiveness of the proposed method is verified on a 1.5 kW DFIG experimental platform.</p>","PeriodicalId":55000,"journal":{"name":"IET Renewable Power Generation","volume":"18 12","pages":"1986-1996"},"PeriodicalIF":2.6,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/rpg2.13053","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141653584","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}

{"title":"Research on integrated energy system planning based on the correlation between wind power and photovoltaic output","authors":"Xiaoming Zhang,&nbsp;Chonglei Ding,&nbsp;Guangzhe Liang,&nbsp;Peihong Yang,&nbsp;Xiang Wang","doi":"10.1049/rpg2.13054","DOIUrl":"10.1049/rpg2.13054","url":null,"abstract":"<p>The research on the randomness and volatility of wind power (WP) and photovoltaic (PV) output of the integrated energy system (IES) has emerged as a pivotal concern, commonly dealt with by clustering techniques. However, traditional clustering techniques often fall short of capturing the comprehensive characteristics of the original scenery data. This paper presents an enhanced clustering logic to improve WP and PV output correlation scenarios. Utilizing the Frank-Copula function, the complex relationship between WP and PV is accurately described. The Kendall rank correlation coefficient (Kendall′s tau) is used as a metric to study the correlation between these two renewable energy sources. The original scenes' correlation coefficients are then clustered using the K-means algorithm, which forms the basis for scene reduction. On the basis, a two-phase robust optimization method is employed to conduct a planning study for a real IES, with the total cost of the system as the optimal objective. This approach ensures that the planning results are better aligned with the specific local conditions during the operation cycle.</p>","PeriodicalId":55000,"journal":{"name":"IET Renewable Power Generation","volume":"18 11","pages":"1771-1782"},"PeriodicalIF":2.6,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/rpg2.13054","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141658452","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}

{"title":"ADRC-based symmetric phase-locked loop structure for improving low-frequency stability of grid-connected inverters","authors":"Yuan Zhu,&nbsp;Kazuhiro Ohyama","doi":"10.1049/rpg2.13043","DOIUrl":"10.1049/rpg2.13043","url":null,"abstract":"<p>With a small short-circuit ratio (SCR), the grid-connected inverter is prone to low-frequency oscillation instability due to the dynamic interaction between the phase-locked loop (PLL) and the weak grid. To this end, an active-disturbance-rejection-controller-based symmetric PLL (ADRC-based SyPLL) is proposed in this article to simplify the system modelling and improve the low-frequency stability of the inverter system. Specifically, the ADRC technique is applied to phase-regulated feedback control of a PLL, where an extended state observer (ESO) is used to estimate the lumped disturbance of the controlled system. A control loop symmetric to the <i>q</i>-axis is further designed on the <i>d</i>-axis of the PLL, and the <i>d</i>-axis information is then added at the reference generation side to eliminate the coupled frequency term in the small-signal model. A simple and accurate single-input single-output (SISO) model is thus obtained. The impedance stability analysis for grid-connected inverters shows that the proposed ADRC-based SyPLL can significantly improve the low-frequency stability margin of the system compared with the conventional PI-regulated PLL. Finally, the experimental results validate the effectiveness and superiority of the proposed method.</p>","PeriodicalId":55000,"journal":{"name":"IET Renewable Power Generation","volume":"18 11","pages":"1819-1831"},"PeriodicalIF":2.6,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/rpg2.13043","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141664450","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}

{"title":"Optimized allocation of microgrids’ distributed generations and electric vehicle charging stations considering system uncertainties by clustering algorithms","authors":"Mohammad-Reza Yaghoubi-Nia,&nbsp;Hamed Hashemi-Dezaki,&nbsp;Abolfazl Halvaei Niasar","doi":"10.1049/rpg2.13038","DOIUrl":"10.1049/rpg2.13038","url":null,"abstract":"<p>The reliability-oriented optimized sizing and placement of electric vehicle (EV) charging stations (EVCSs) has received less attention. In addition, the literature review shows that a research gap exists regarding a clustering-based method to optimize the allocation of DGs and EVCSs, considering the system uncertainties. This article tries to fill such a knowledge gap by proposing a new clustering-based method to optimize the allocation of DGs and EVs simultaneously, considering the uncertainties of EV behaviours and stochastic behaviours of renewable DGs. Developing a new stochastic model for EVs using the clustering algorithm is one of the essential contributions. The uncertain parameters, e.g. EV charging loads based on EV owners’ behaviours (arrival time, departure time, and driving distance) and renewable DGs, would be clustered. The proposed method could solve the execution time challenges of Monte Carlo simulation-based approaches to concern the stochastic behaviours of smart grids. The simultaneously reliability-oriented optimal allocation of EVCSs, DGs, and protection equipment, using the proposed clustering-based algorithm is another main contribution. The IEEE 33-bus test system is studied to examine the introduced method. Simulation results imply that a 1.45% accuracy improvement could be obtained compared to available analytical ones, while its execution time is appropriate.</p>","PeriodicalId":55000,"journal":{"name":"IET Renewable Power Generation","volume":"18 11","pages":"1798-1818"},"PeriodicalIF":2.6,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/rpg2.13038","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141664525","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}

{"title":"Fault ride through enhancement of large-scale solar plants using distributed converters","authors":"Seyed Mohammad Hasan Mousavi,&nbsp;Teymoor Ghanbari,&nbsp;Ebrahim Farjah,&nbsp;Abbas Mehraban","doi":"10.1049/rpg2.13031","DOIUrl":"10.1049/rpg2.13031","url":null,"abstract":"<p>The grid-connected photovoltaic plants (GCPVPs) encounter various types of anomalies during fault occurrence in the main grid. During a fault occurrence on the grid side, the voltage of the point of common coupling (PCC) drops, causing the DC connection voltage to become too high for power balancing. This high DC voltage may damage the inverter and DC link equipment, which necessitates a reliable control scheme with low voltage passage requirements. These requirements, which obligate the GCPVP to remain connected to the main grid during abnormal conditions are generally known as low voltage ride-through (LVRT). Herein, a developed LVRT method in the control approach that injects maximum rated current during a sag is proposed to rectify the shortcomings in single and multi-inverter grid topologies. The proposed approach utilizes a current limiter combined with a DC braking chopper to guarantee the GCPVP's continuous participation in the power supply. Different scenarios including low and high power generations as well as two-phase and three-phase severe faults to the ground are considered. The results show that the proposed approach not only improves the performance in the single-inverter system but also remedies the defects aggravated in the case of a GCPVP with several inverters.</p>","PeriodicalId":55000,"journal":{"name":"IET Renewable Power Generation","volume":"18 11","pages":"1758-1770"},"PeriodicalIF":2.6,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/rpg2.13031","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141667364","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}

{"title":"On the optimal game control in the DC microgrid systems","authors":"Zahra Mokhtarnejad,&nbsp;Jalal Nazarzadeh","doi":"10.1049/rpg2.13023","DOIUrl":"10.1049/rpg2.13023","url":null,"abstract":"<p>This paper introduces static and dynamic competitive optimal control of DC/DC converters in DC microgrids based on game theory considering mutual effects. Using static and dynamic game theories, the conditions for competitive optimal control of DC/DC converters in Nash equilibrium with static and dynamic states are determined. Also, to reduce the complexity in the design of competitive optimal control of DC/DC converters due to the bilinear dynamic model of the system, generalized objective functions are considered. The competitive optimal controls using the Lyapunov and Riccati equations are determined to track the system trajectory to Nash equilibrium. Also, the numerical and experimental results are presented and compared in several cases. The results show that the competitive optimal control of the DC/DC converters in the DC microgrids can effectively improve the performance of the system.</p>","PeriodicalId":55000,"journal":{"name":"IET Renewable Power Generation","volume":"18 11","pages":"1711-1722"},"PeriodicalIF":2.6,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/rpg2.13023","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141668811","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}

{"title":"Analysis of protection blinding in active distribution grids","authors":"Amit Dilip Patil,&nbsp;Abdorasoul Ghasemi,&nbsp;Hermann de Meer","doi":"10.1049/rpg2.13037","DOIUrl":"https://doi.org/10.1049/rpg2.13037","url":null,"abstract":"<p>Protection blinding is a challenging issue in renewables-penetrated distribution grids and refers to a situation where a circuit breaker may not trip due to fault current contribution from distributed generation. This research addresses how the distributed generation location and capacity impact the operation of the circuit breaker in terms of the response time of the circuit breakers. The relative electrical distances of the faults and distributed generation to the circuit breakers are considered. The impact of distributed generation capacity considering the fault location is characterized using a new index called the heterogeneity index. The electrical distance between distributed generations and circuit breakers and the electrical distance between fault and circuit breaker is considered by a second new index called the electrical distance ratio. Data analysis on simulation results shows that these indices capture the phenomena of protection blinding caused by distributed generation. Results show that a higher distributed generation penetration and faults that are electrically further away from a circuit breaker show severe cases of protection blinding captured by the indices. Furthermore, it is demonstrated how these indices can identify the worst impacted locations in the distribution grid. A key result is that protection blinding does not necessarily occur solely due to the presence of distributed generation between a circuit breaker and a fault, but is dependent on factors such as distributed generation location in the distribution grid, fault level, fault level distribution across the generation units and fault location.</p>","PeriodicalId":55000,"journal":{"name":"IET Renewable Power Generation","volume":"18 11","pages":"1783-1797"},"PeriodicalIF":2.6,"publicationDate":"2024-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/rpg2.13037","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141967495","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}

{"title":"Improvement of LVRT capability of grid-connected wind-based microgrid using a hybrid GOA-PSO-tuned STATCOM for adherence to grid standards","authors":"Muhammad Zubair Yameen,&nbsp;Zhigang Lu,&nbsp;Muhammad Amir Akram Rao,&nbsp;Alsharef Mohammad,&nbsp; Nasimullah,&nbsp;Waqar Younis","doi":"10.1049/rpg2.13036","DOIUrl":"https://doi.org/10.1049/rpg2.13036","url":null,"abstract":"<p>The increase in wind power-based microgrids emphasizes the importance of addressing stability challenges during low-voltage ride-through (LVRT) events in weak AC grid-connected doubly fed induction generator systems. Compliance with grid standards, notably LVRT capabilities, is critical as wind power plants integrate increasingly into power systems, raising concerns about generation loss and post-fault oscillations in microgrids. Previously, researchers have utilized techniques like fuzzy logic, ant colony, and genetic algorithms for static synchronous compensator (STATCOM) tuning to enhance microgrid stability during fault scenarios. This study uses the grasshopper optimization algorithm (GOA), particle swarm optimization (PSO), and a novel hybrid GOA-PSO. On the main grid, the power system is subject to both symmetrical and asymmetrical faults. The proposed novel technique aims to improve LVRT, minimize generation loss during faults, and reduce after-fault oscillations by optimizing reactive power flow between the point of common coupling and the microgrid while adhering to the LVRT grid code. MATLAB/Simulink is utilized to evaluate the LVRT performance of a 16 MW DFIG-based microgrid operating in grid-connected mode. The performance of the GOA-PSO-tuned STATCOM is evaluated by comparing it with conventional, PSO, and GOA-tuned STATCOM in three fault scenarios. The comparison shows that GOA-PSO-tuned STATCOM improves grid stability and reliability.</p>","PeriodicalId":55000,"journal":{"name":"IET Renewable Power Generation","volume":"18 15","pages":"3218-3238"},"PeriodicalIF":2.6,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/rpg2.13036","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142674187","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}