Jifeng Song

About Jifeng Song

Jifeng Song, With an exceptional h-index of 12 and a recent h-index of 11 (since 2020), a distinguished researcher at North China Electric Power University, specializes in the field of solar.

His recent articles reflect a diverse array of research interests and contributions to the field:

State of charge estimation for lithium-ion battery based on improved online parameters identification and adaptive square root unscented Kalman filter

Cloud detection method using ground-based sky images based on clear sky library and superpixel local threshold

Strain Relaxation Characterization on Lithium‐ion Batteries at Different States of Charge and Charging Rates

A Method for Rapid Measurement of Cloud Base Height From a Pair of Sky Imagers

Concentration performance evaluation of sunlight concentrators: Fresnel lens, plano-convex lens, and parabolic mirrors for daylighting application

Analysis and comparison of daylighting technologies: Light pipe, optical fiber, and Heliostat

Cloud detection method based on clear sky background under multiple weather conditions

Study on thermal protection and temperature of PMMA plastic optical fiber for concentrated sunlight transmission in daylighting

Jifeng Song Information

University

North China Electric Power University

Position

___

Citations(all)

430

Citations(since 2020)

327

Cited By

220

hIndex(all)

12

hIndex(since 2020)

11

i10Index(all)

17

i10Index(since 2020)

14

Email

University Profile Page

North China Electric Power University

Jifeng Song Skills & Research Interests

solar

Top articles of Jifeng Song

State of charge estimation for lithium-ion battery based on improved online parameters identification and adaptive square root unscented Kalman filter

Authors

Xingtao Liu,Wenlong Xia,Siyuan Li,Mingqiang Lin,Ji Wu

Journal

IEEE Transactions on Transportation Electrification

Published Date

2023/9/12

Electric vehicles (EVs) are instrumental in driving the transition towards transportation electrification, achieving carbon peak targets, and striving for carbon neutrality. Within the EV ecosystem, battery packs serve as vital energy storage systems. However, existing research has primarily concentrated on modeling and estimating the state of individual battery cells, posing challenges when applying these models directly to battery packs due to their inherent complexity and the variability among cells within them. Consequently, limited efforts have been made to explore alternative models and methods to improve estimation accuracy while reducing complexity. Here, we propose a novel data-driven and filter-fused algorithm for estimating battery packs’ state of charge (SOC). Firstly, representative cells are selected to minimize data redundancy and system complexity while accurately representing the pack’s state. Then …

Cloud detection method using ground-based sky images based on clear sky library and superpixel local threshold

Authors

Yinsen Niu,Jifeng Song,Lianglin Zou,Zixuan Yan,Xilong Lin

Journal

Renewable Energy

Published Date

2024/4/5

In the intra-hour time scale, shielding of solar radiation by clouds is the main reason for the fluctuation of photovoltaic, so cloud parameters are important for intra-hour solar irradiance and photovoltaic power forecasting. Extracting cloud regions from cloud images provides a basis for quantifying cloud size and shape. It is difficult to detect clouds in these three cases, such as clouds in circumsolar region, clouds in haze weather and thin clouds at cloud edge. Aiming at such problems, this study firstly establishes a clear sky library based on pixel-level sun positions and haze conditions to deal with the complex changes of sky brightness. Then this study proposes a cloud detection method for ground-based images, which performs two segmentations on the cloud image. The initial segmentation process is a combination method that uses clear sky library method when the sun is visible and uses adaptive threshold …

Strain Relaxation Characterization on Lithium‐ion Batteries at Different States of Charge and Charging Rates

Authors

Jifeng Song,Tao Ren,Yuanlong Li,Juntao Wang,Zhengye Yang,Kashif Ali

Journal

Energy Technology

Published Date

2024/4/3

The strain on the cell casing can serve as an indicator of the internal state of the cell. Monitoring strain during the charging and discharging processes aids in determining optimal charging and discharging operations, thereby maximizing the lifespan and performance of the battery. Herein, strain dynamic curves are obtained for lithium‐ion batteries at low, medium, and high charge and discharge rates by affixing strain gauges to individual cells. The investigation delves into parameters such as strain relaxation time, maximum strain, and residual strain at various charge rates and states of charge. The experimental findings reveal distinctive patterns, indicating that the strain curve during high‐rate charging resembles a second‐order function, exhibiting more pronounced fluctuations as the rate increases. This stands in stark contrast to the strain exponential decay observed during conventional medium and low‐rate …

A Method for Rapid Measurement of Cloud Base Height From a Pair of Sky Imagers

Authors

Lianglin Zou,Jifeng Song,Yisen Niu,Zixuan Yan,Xilong Lin

Journal

IEEE Geoscience and Remote Sensing Letters

Published Date

2024/2/26

Cloud base height, a crucial spatial parameter of cloud clusters, plays a significant role in the field of photovoltaics and other domains. In order to obtain the cloud base height information of the whole sky, the cloud base height measurement technology based on binocular vision technology has been developed. However, the current global matching method yields a single value, while the computational efficiency of the local matching technique remains inadequate. This letter proposes a fast measurement method for determining cloud base height using a semi-local matching technique. First, the ground-based cloud image is segmented to reduce the calculation amount of cloud base height. Subsequently, the individual cloud blocks are divided into clusters through clustering. Finally, matching points are identified for each individual cloud section using feature detection and matching, allowing for the computation of …

Concentration performance evaluation of sunlight concentrators: Fresnel lens, plano-convex lens, and parabolic mirrors for daylighting application

Authors

Jifeng Song,Bizuayehu Bogale Dessie

Journal

International Journal of Green Energy

Published Date

2024/2/11

This study investigates the concentration performance of three concentrator types – Fresnel lens, plano-convex lens, and parabolic mirrors in focusing sunlight onto a 1.5 mm diameter plastic optical fiber. The evaluation uses TracePro ray tracing software for simulation and analysis, considering visible light and infrared bands. Results show that parabolic mirrors achieved the highest concentration ratio at 7720 suns, followed by the Fresnel lens at 6400 suns, and the plano-convex lens at 2750 suns for a wavelength of 535 nm, surpassing geometric concentration values of 1202 suns. Efficiency measurements revealed that the Fresnel lens achieved 86% efficiency, the parabolic mirrors reached 97% efficiency, and the plano-convex lens achieved 93% efficiency. Additionally, the parabolic mirror demonstrated potential for creating the smallest concentration spot size due to its ability to focus light on a single point …

Analysis and comparison of daylighting technologies: Light pipe, optical fiber, and Heliostat

Authors

Jifeng Song,Bizuayehu Bogale Dessie,Longyu Gao

Journal

Sustainability

Published Date

2023/7/14

This article analyzes and compares three daylighting technologies: light pipes, optical fibers, and heliostats. This work aims to evaluate their efficiency, sustainability, and cost-effectiveness in providing natural light to indoor spaces. The analysis includes a review of the principles behind each technology, the design and development of the prototypes and experiments carried out by our research team, their advantages and disadvantages, and their applications in different settings. The comparison is based on several criteria, such as installation, cost, efficiency, output spectrum, and hybrid system. The results indicate that each technology has its unique features and is suited to specific applications. Light pipes are effective for short distances, and they can be easily integrated into existing buildings. Optical fibers are suitable for long distances and offer flexibility in design, but they require more maintenance. Heliostats are ideal for large spaces, but they are expensive to install and operate. Overall, this study provides valuable insight into the strengths and weaknesses of three daylighting technologies and helps designers and architects make informed decisions when selecting the most appropriate solution for future work.

Cloud detection method based on clear sky background under multiple weather conditions

Authors

Jifeng Song,Zixuan Yan,Yisen Niu,Lianglin Zou,Xilong Lin

Journal

Solar Energy

Published Date

2023/5/1

This paper deals with an image processing methodology based on a clear sky library for cloud detection. It is a part of a project which aims at using the detection results of ground-based cloud images in combination with solar irradiation data to complete power forecasts for solar power plants at ultra-short-term horizons (15 min). This paper focuses on the implementation of the cloud detection process. To overcome the problem of detection failure caused by uneven background brightness distribution in the sky, detection work is achieved by building a library of clear sky background images for various weather conditions at different solar zenith angles and combining background elimination methods through image rotation and image matching algorithms. A hybrid algorithm is proposed for detection failure when the sun is blocked by the cloud to achieve secondary processing. The test results show that this method …

Study on thermal protection and temperature of PMMA plastic optical fiber for concentrated sunlight transmission in daylighting

Authors

Kai Wang,Qian Wang,Lianglin Zou,Ying Su,Kunhao Liu,Wei Li,Kexin Zhang,Haiyu Wang,Jifeng Song

Journal

Solar Energy

Published Date

2023/3/15

Daylighting system by concentrating and transmitting sunlight through optical fiber is an emerging technology of direct utilization of solar energy. In this work, a sunlight concentrating and transmitting system via plastic optical fibers was developed and investigated. This study addressed the overheating problem of plastic optical fibers under highly concentrated light irradiation. Polymethylmethacrylate (PMMA) plastic fibers have a strong absorption in the infrared band. The PMMA plastic fiber generates serious heat under highly concentrated light transmission, which leads to its overheating and burning. In this study, an incident light filtering method based on the combination of infrared filter and insulating glass is proposed. By filtering out the infrared band light with significant thermal effect, the PMMA plastic optical fibers are guaranteed to be within a safe working temperature range. Experiments demonstrated that …

Measurement and Analysis of Light Leakage in Plastic Optical Fiber Daylighting System

Authors

Kunhao Liu,Lianglin Zou,Yuanlong Li,Kai Wang,Haiyu Wang,Jifeng Song

Journal

Sustainability

Published Date

2023/2/9

The daylighting systems via polymethylmethacrylate (PMMA) plastic optical fibers have obvious cost advantages and have been widely studied. However, there is light leakage when PMMA optical fibers transmit concentrated sunlight, resulting in a transmission efficiency lower than the theoretical value. This research aims to quantitatively study the light leakage effect of PMMA optical fibers. Concentrated sunlight was used as the sunlight source instead of a monochromatic laser. An adjustable diaphragm was used to adjust the angle of the incident light, and the infrared filter and heat-absorbing glass were used to solve the overheating problem of PMMA fibers. The results show that when the incident angle is greater than 13°, the relative transmission efficiency of the fibers drops rapidly, which means that the light leakage deteriorates. The data also show that the angle of the output beam of PMMA optical fibers is ±30°, which is independent of the angle of the incident beam. Based on this conclusion, a PMMA optical fiber daylighting system with an incident angle of 13° was developed, which has higher transmission efficiency than previously developed systems. This study indicates that the angle effect of light leakage should be considered in the design of a plastic optical fiber daylighting system.

Highly concentrated solar flux of large fresnel lens using CCD camera-based method

Authors

Kexin Zhang,Ying Su,Haiyu Wang,Qian Wang,Kai Wang,Yisen Niu,Jifeng Song

Journal

Sustainability

Published Date

2022/9/5

Fresnel lens is a kind of lens that can concentrate sunlight up to a level of thousands of suns with small space occupation which is widely used in the research of sunlight concentration and transmission systems via optical fiber. Most studies on the concentrated flux of lenses use experimental methods to measure the flux distribution on the receiver of parabolic trough solar concentrators, solar power towers, and parabolic dish concentrators, while for Fresnel lenses, especially large-aperture Fresnel lenses such as the one in this manuscript, the simulation approach was mostly used. In response to this problem, this study has developed an experimental system for measuring the concentrated flux density of Fresnel lenses. A charge-coupled device (CCD) camera was used to capture the image of spot of large-aperture (968 mm) Fresnel lenses in the CCD camera-based method, and a heat flow meter was used to calibrate the spot brightness image obtained by the CCD camera. Experimental data show that the peak flux of concentrated spot can reach 4.06 MW/m2. This method confirms the simulation results of previous studies that using the rays tracing method, that is, the flux level of the Fresnel lenses can reach 5000 suns. The experimental results demonstrated the CCD camera-based method combined with a heat flow meter is competent in measuring the intensity of flux with a level of 5000 suns.

A note of quantitative diagnosis of compound errors in trough concentration system

Authors

Jifeng Song,Haiyu Wang,Kunhao Liu,Lianglin Zou,Kai Wang,Ying Su,Qian Wang,Zubing Zou

Journal

Solar Energy

Published Date

2022/7/15

In practice, there are multiple optical errors existing in parabolic trough concentrator, which respectively have a unique effect on the flux distribution on the wall of the absorber, causing it to deviate from the ideal operating condition. Diagnosis for multiple errors is difficult. The effect of combined optical errors on the flux distribution can be modelled using convolution operations. In this study, the flux patterns under multiple types of optical errors are traversed and combined, and the actual flux distribution profiles of the parabolic trough concentrator measured by a camera-based method are compared to identify the Gaussian slope error, gravity deformation error and alignment error of the concentrator. This indicates that it is feasible to invert the flux profile on the absorber wall and diagnose the types and values of the corresponding optical errors of the concentrator.

Performance analysis and capacity optimization of a solar aided coal-fired combined heat and power system

Authors

Zeyu Ding,Hongjuan Hou,Liqiang Duan,Eric Hu,Nan Zhang,Jifeng Song

Journal

Energy

Published Date

2022/1/15

Solar aided (coal-fired) combined heat and power (SACHP) system can realize the heat-power decoupling and maximize the utilization of renewable energy over the normal CHP system. The problems regarding the operation strategy and capacity optimization of such a SACHP system during the design process are addressed in this study. According to different heat and power demands, different operation strategies are proposed. A 330 MWe SACHP system with a 50 MWe wind farm attached is studied. Daily and annual performances are evaluated in terms of wind power accommodation, standard coal consumption (SCC), solar-to-power efficiency, and economic performance. Results show that compared with the 330 MWe CHP system, the SACHP system can increase wind power consumption (202.69 MWh) and reduce SCC (80.23t) during a heating season day. During a non-heating season day, the solar-to …

Influence of sunshape and optical error on spillover of concentrated flux in solar thermal power tower plant

Authors

Jifeng Song,Genben Yang,Haiyu Wang,Yisen Niu,Hongjuan Hou,Ying Su,Qian Wang,Zubing Zou

Journal

Energy

Published Date

2022/10/1

It is important to calculate and evaluate the spillover of flux reflected by heliostats on the heat shields for the construction, operation and optimization of solar thermal power tower plant. By establishing a concentrated flux distribution model of power tower plant based on the real sunshape and taking haze, optical error, shadowing and blocking effect into consideration, the authors calculated the flux density distribution on the receiver and heat shields under various conditions. The results show that the radiation energy on heat shields can reach about 15–45 MW under typical conditions, accounting for 1%–8% of the total received energy of the system. The flux density on heat shields is between 30 and 70 kW/m2, which is equivalent to the flux level of trough solar concentrator system. The calculations and fitting results show that the energy proportion on heat shields is positively correlated with circumsolar ratio(CSR …

Thermal performance study of tower solar aided double reheat coal-fired power generation system

Authors

Yue Jiang,Liqiang Duan,Liping Pang,Jifeng Song

Journal

Energy

Published Date

2021/9/1

In this paper, a novel tower solar aided coal-fired power generation (TSACPG) system with double reheat ultra-supercritical boiler is proposed. Part of the steam at the primary reheater inlet of the boiler is heated by tower solar collector and returned to the primary reheater according to the principle of energy grade matching. The thermal performances of the TSACPG system under different operation loads are studied. The maximum steam extraction mass flow of the boiler first reheater and the utilization rate of solar energy are obtained. The results show that the maximum steam extraction mass flow rates of the boiler are 70 kg/s in 100% THA, 75 kg/s in 80% THA and 87 kg/s in 60% THA load, respectively. And the standard coal consumption rates are decreased by 4.85 g/kWh, 8.79 g/kWh and 18.55 g/kWh, respectively. The boiler exergy efficiency ascends significantly and the thermal efficiency of the TSACPG …

A calculation method of precise direct normal irradiance based on measured CSR

Authors

Yisen Niu,Zhaoxuan Wu,Kexin Zhang,Jifeng Song

Journal

IOP Conference Series: Earth and Environmental Science

Published Date

2021

Radiation from the circumsolar region called circumsolar radiation is part of direct solar radiation, but not all circumsolar radiation can be received by concentrating solar power (CSP). Circumsolar ratio (CSR) reflects the proportion of circumsolar normal irradiance in direct normal irradiance (DNI). CSR is related to the radial distribution of solar brightness (sunshape) and it is influenced by atmospheric turbidity and air mass (AM). Performance of CSP is affected by CSR, which should be considered in the CSP simulation and analysis. This work introduces a method of measuring CSR with a CCD camera and filters. Also a calculation method of DNI for different field of view based on the measured CSR is proposed.

A note on solution to overheating damage of plastic optical fibers in daylighting system

Authors

Juntao Wang,Zhaoxuan Wu,Genben Yang,Yisen Niu,Liqiang Duan,Jifeng Song

Journal

Energy and Buildings

Published Date

2021/12/15

Due to low cost and flexibility, Polymethylmethacrylate (PMMA) plastic optical fibers were widely used in the daylighting system. However, the overheating damage caused by infrared thermal effects has seriously affected the safety of PMMA optical fibers. To solve this problem, this work experimented three configurations in Tibet, which include homogenizer, infrared light filter, and liquid water. The analysis showed that the infrared light filter and liquid water are complementary in filtering infrared light, which filter infrared light in the range of 780–1100 nm and 1100–2500 nm respectively. The experimental results demonstrated that the PMMA optical fibers can transmit high solar flux safely under the combined protection of homogenizer, infrared light filter, and liquid water.

Application of highly concentrated sunlight transmission and daylighting indoor via plastic optical fibers with comprehensive cooling approaches

Authors

Jifeng Song,Zhaoxuan Wu,Juntao Wang,Kexin Zhang,Kai Wang,Kunhao Liu,Liqiang Duan,Hongjuan Hou

Journal

Renewable Energy

Published Date

2021/12/1

Sunlight Concentrated and transmission for daylighting via optical fibers is a booming technology of direct utilization of solar energy. It uses optical fibers to introduce sunlight deep into building interior. In this work, a sunlight concentrating and transmitting system via plastic optical fibers was developed and tested. This study addressed the cooling problem of the plastic optical fibers under highly irradiation. Polymethylmethacrylate (PMMA) plastic fibers have a strong absorption effect on infrared light, which means that plastic fibers heat up so much when they transmit focused sunlight that they burn. In this study, a comprehensive cooling approach was developed to solve the overheating problem of plastic optical fibers, which consists of an infrared filter, cooling water and a homogenizer. The transmission efficiency of the system was measured to be about 15%. Experiments show that the comprehensive cooling …

A note of optical error diagnosis of parabolic trough concentrator based on flux image

Authors

Jifeng Song,Wenmo Wang,Yisen Niu,Juntao Wang,Hai Yu

Journal

Solar Energy

Published Date

2020/2/1

In practical applications, there are many optical errors in the parabolic trough concentrators (PTC), such as mirror slope errors and tracking errors. Image detection is a no contact technique that has a potential to diagnose the optical errors at large plants in use. In this study, a CCD (Charge Coupled Device) camera was used to directly observe the absorber, and the images of the flux peaks were successful obtained. The CCD image showed two bright peaks on the outer wall of the tubular absorber. By comparing the CCD image with the simulation results, the concave deformation of the parabolic mirror was diagnosed, and the slope error of the parabolic mirror was figured out. The images also revealed that sun tracking errors can cause a synchronous shift in the flux. The flux image method does not influence the normal operation of PTC and is an on-line method, which facilitates the field application.

See List of Professors in Jifeng Song University(North China Electric Power University)

Jifeng Song FAQs

What is Jifeng Song's h-index at North China Electric Power University?

The h-index of Jifeng Song has been 11 since 2020 and 12 in total.

What are Jifeng Song's top articles?

The articles with the titles of

State of charge estimation for lithium-ion battery based on improved online parameters identification and adaptive square root unscented Kalman filter

Cloud detection method using ground-based sky images based on clear sky library and superpixel local threshold

Strain Relaxation Characterization on Lithium‐ion Batteries at Different States of Charge and Charging Rates

A Method for Rapid Measurement of Cloud Base Height From a Pair of Sky Imagers

Concentration performance evaluation of sunlight concentrators: Fresnel lens, plano-convex lens, and parabolic mirrors for daylighting application

Analysis and comparison of daylighting technologies: Light pipe, optical fiber, and Heliostat

Cloud detection method based on clear sky background under multiple weather conditions

Study on thermal protection and temperature of PMMA plastic optical fiber for concentrated sunlight transmission in daylighting

...

are the top articles of Jifeng Song at North China Electric Power University.

What are Jifeng Song's research interests?

The research interests of Jifeng Song are: solar

What is Jifeng Song's total number of citations?

Jifeng Song has 430 citations in total.

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