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453 results on '"Han, Pingping"'

64. Research on Source-Network Coordination Voltage Control Strategy of Photovoltaic Power Plant Considering the Stability of Inverter Port Voltage

Author

Ma Jinhui, Ye Haifeng, Li Zhi, Han Pingping, Lin Zihao, and Shi Jianxiong

Subjects
Environmental sciences, GE1-350
Abstract

At present, the reactive power distribution method considering the reactive power adjustment capacity of the inverter in the photovoltaic (PV) power plant will lead to the output voltage of the inverter exceeding the limit. In particular, the PV inverter adopts the constant reactive power control to support the voltage at point of common coupling (PCC), which has a good effect in the steady-state operation. However, when the system is subject to transient disturbance, the PV inverter cannot flexibly support the voltage level of the system by changing the reactive power output. Therefore, this paper proposes a source-network coordination control strategy aiming at the stability of bus voltage at PCC and inverter port voltage. Firstly, the paper introduced the advantages of constant voltage control of PV inverter. Then, the voltage and reactive power control objectives of the PV Inverter in the PV power plant were calculated by considering the PCC voltage, tie lines, power collection lines, the power of transformers and the voltage loss to realize the voltage and reactive power balance control between the inverters. Finally, an actual PV power plant simulation model was built to analyse the PCC voltage under the two conditions of PV output fluctuation and system fault to verify the effectiveness of the control strategy proposed in this paper. The proposed strategy has engineering application value for the realization of closed-loop voltage control between the power grid and PV power plant and the improvement of the active response ability to the PCC voltage.

Published
2020
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73. Participation Factors Instability and Analysis of Direct-Drive Wind Farms with VSC-HVDC Systems

Author

Shao, Bingbing, Meng, Xiaoxiao, Han, Pingping, Yang, Yongheng, Wu, Hongbin, Chen, Zhe, and Blaabjerg, Frede

Subjects
Eigenvalues and eigenfunctions, Sensitivity, Wind farms, Analytical models, Perturbation methods, Damping
Abstract

This paper reveals a new phenomenon that when there are close eigenvalues in direct-drive wind farms with VSC-HVDC systems, participation factors may change significantly under a small parameter perturbation. In light of this, the phenomenon is defined as participation factors instability, which is theoretically proved. Besides, as participation factors affect the optimal location of damping controllers, the participation factors sensitivities against key parameters are analyzed to guide the design of damping controllers. PSCAD/EMTDC simulations of a three-machine model are performed to verify the theoretical analysis.

Published
2022

79. Pleiotropic architectures of porcine immune and growth trait pairs revealed by a self‐product‐based transcriptome method.

Author

Han, Pingping, Wang, Chao, Zhang, Wei, Wu, Yalan, Wang, Daoyuan, Zhao, Shuhong, and Zhu, Mengjin

Subjects
*GENOME-wide association studies, *PHENOMENOLOGICAL biology, *TRANSCRIPTOMES, *SWINE breeding
Abstract

Pleiotropy is an important biological phenomenon with complicated genetic architectures for multiple traits. To date, pleiotropy has been mainly identified by multi‐trait genome‐wide association studies, but this method has its disadvantages, and new developments for pleiotropy detection methods are needed. Here we define a novel metric, self‐product, to measure individual‐level co‐variation of two traits, and develop a novel self‐product‐based transcriptome method to detect pleiotropic genes (PGs). Our method was tested using four immune–growth trait pairs and four immune–immune trait pairs in pigs. Comparative transcriptome analyses identified hundreds of candidate PGs related to eight trait pairs from two tails of self‐product distribution. Gene Ontology enrichment analysis indicated that most of identified PGs were involved in immune‐ or growth‐related biological processes. We established PG interaction networks to exhibit core genes shared by eight trait pairs, of which CCL5 and IL‐10 genes were the hub genes. Genetic association analyses showed that SmaI‐polymorphisms of CCL5 and IL‐10 genes had significant associations with phenotypic co‐variations of multiple trait pairs, indicating that the variants in pleiotropic genes were also pleiotropic variants. Taken together, the validity of our proposed method was preliminarily verified, and our findings provide new insights into the genetic basis of pleiotropic architectures of immune and growth trait pairs in pigs. [ABSTRACT FROM AUTHOR]

Published
2023
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92. Investigation into the Phase–Activity Relationship of MnO 2 Nanomaterials toward Ozone‐Assisted Catalytic Oxidation of Toluene (Small 50/2021)

Author

Yang, Ruijie, primary, Guo, Zhongjie, additional, Cai, Lixin, additional, Zhu, Rongshu, additional, Fan, Yingying, additional, Zhang, Yuefeng, additional, Han, Pingping, additional, Zhang, Wanjian, additional, Zhu, Xiangang, additional, Zhao, Qitong, additional, Zhu, Zhenye, additional, Chan, Chak Keung, additional, and Zeng, Zhiyuan, additional

Published
2021
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93. Antibody response to BNT162b2 mRNA vaccine in gingival crevicular fluid.

Author

Han, Pingping, Moran, Corey S., Sulugodu Ramachandra, Srinivas, Walsh, Laurence J., and Ivanovski, Sašo

Abstract

Background: This prospective cohort study aimed to evaluate the antibody responses in non-invasive gingival crevicular fluid (GCF) and unstimulated whole saliva to the SARS-CoV-2 Spike unit 1 receptor-binding domain (S1-RBD) protein following administration of the mRNA BNT162b2 vaccine.Methods: This longitudinal study recruited 37 participants with no prior COVID-19 exposure (eight people recruited prior to the COVID-19 pandemic - labeled pre-COVID, 16 vaccinated and 13 non-vaccinated participants). An enzyme-linked immunosorbent assay (ELISA) was used to determine antibody levels against S1-RBD in saliva (n=90) and GCF (n=80) samples obtained at 1 and 3 weeks after dose 1, and 3 days, 7 days, and 3 weeks after dose 2. To determine previous SARS-CoV-2 infection status, anti-nucleocapsid (N) Ig levels were determined in samples from the pre-COVID (saliva as reference), non-vaccinated (saliva and GCF), and vaccinated (saliva and GCF) participants at 1-week post-dose 1 using ELISA.Results: Salivary levels of anti-N antibodies measured in samples from vaccinated and nonvaccinated participants were comparable to those in pre-COVID saliva samples collected between October 2018 and September 2019, thus confirming that all study participants had no prior SARS-CoV-2 infection. Overall, the levels of anti-S1-RBD antibodies peaked at 3 weeks after dose 2 in both saliva and GCF for all three immunoglobulin isotypes. Notably, the concentration of anti-S1-RBD antibodies in GCF was significantly higher than in saliva at all time points.Conclusion: This study establishes GCF and saliva as viable alternative non-invasive sources to monitor levels of antibodies following vaccination, with GCF demonstrating feasibility as a biofluid source for the detection of antibodies against SARS-CoV-2 S1-RBD antigen. [ABSTRACT FROM AUTHOR]

Published
2023
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