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2024 1st International Conference on Smart Grids and power systems, ICSGPS 2024

作者： Rana, Zuraiz Meng, Runquan Ali, Kashif Haseeb, Rashid Shanxi Key Lab of Power System Operation and Control Taiyuan University of Technology Shanxi China

High power density is an advance in power electronics. Third generation wide-bandgap semiconductor devices (WBG SICs) offer significantly improved performance compared to standard silicon devices. SIC MOSFET is commonly used in power electronic equipment such as converters due to its low resistance, excellent thermal stability, and rapid switching speed. Increasing the switching frequency effectively reduces the circuit size. This article uses SIC MOSFET and STM32 single-chip MCU to design a high power density and higher frequency buck boost converter and establish a simulation model in LTspice. The driving circuit designed for SIC MOSFET is intended to maximize the converter's reliability. Synchronous rectification applies to enhance the converter efficiency. Compared to other types of converters, the size of the converter is reduced, achieving the goals of lightweight and high power density of DC/DC converters. © 2024 Published under licence by IOP Publishing Ltd.

关键词： Silicon carbide

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Integrated Train Ground Radio Communication system Based TD-LTE

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Chinese Journal of Electronics 2016年第4期25卷 740-745页

作者： ZHAO Hongli CAO Yuan ZHU Li XU Wei National Engineering Research Center of Rail Transportation Operation and Control System Beijing Jiaotong University State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University National Mobile Communications Research Lab. Southeast University

In existing metro systems,the train ground radio communication system for different applications are deployed *** and constructing the communication infrastructures repeatedly wastes substantial social resources,and it brings difficulties to maintain all these *** present the communication Quality of service(Qo S) requirement for different train ground radio *** integrated TD-LTE based train ground radio communication system for the metro system(LTE-M) is designed *** order to test the LTEM system performance,an indoor testing environment is set *** channel simulator and programmable attenuators are used to simulate the real metro *** test results show that the designed LTE-M system performance satisfies metro communication requirements.

关键词： Communication based train control(CBTC) Train control LTE-M Performance test

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Study of improved active-clamped phase shift full bridge converter 3

Study of improved active-clamped phase shift full bridge con...

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3rd International Conference on Electrical Engineering and control Science, IC2ECS 2023

作者： He, Xin Meng, Runquan Li, Ruishu Taiyuan University of Technology Shanxi Key Lab of Power System Operation and Control Taiyuan China

ISBN: (纸本)9798350382426

Aiming at the drawbacks of the conventional phase-shifted full-bridge topology in terms of high voltage stress in the synchronous rectifier switches and high switching loss of the primary-side switch under low load conditions, a phase-shifted full-bridge circuit with improved control of an active clamp circuit is proposed. The converter utilizes the resonance of the switch parasitic capacitance with the primary-side resonant inductor to achieve ZVS (Zero- Voltage-Switch) under light load, and effectively improves the efficiency under heavy load by zeroing the primary-side current in the circulating current stage. In this paper, the topology, operating principle and operating characteristics of the proposed scheme are described in detail, and the feasibility of the scheme is verified by simulation in PLECS platform. © 2023 IEEE.

关键词： Active clamp component LC resonance Phase-shifted full bridge Switched capacitor Zero-voltage switching

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Optimization of CRM Totem Pole PFC Based on Inductor Current Zero-Crossing Prediction Strategy 7

Optimization of CRM Totem Pole PFC Based on Inductor Current...

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7th International Conference on power and Energy Applications, ICPEA 2024

作者： Liu, Xin Ren, Chunguang Taiyuan University of Technology Shanxi Key Lab of Power System Operation and Control Taiyuan China

ISBN: (纸本)9798350356113

The totem-pole bridgeless PFC circuit based on GaN devices is currently a research hotspot. To achieve full-range ZVS (Zero Voltage Switching), it is necessary to select a reasonable ZCD (Zero Current Detection) sampling scheme and dead time for the inductor current in CRM (Critical Conduction Mode). Addressing the issues of large computational burden and poor reliability in current inductor current zero-crossing prediction strategies, this paper proposes optimizing the turn-off time of the freewheeling diode and the adaptive dead time to improve the reliability of inductor current zero-crossing prediction and the realization of full-range ZVS. Finally, leveraging the powerful computational capability of a high-performance DSP, the proposed method was validated through reasonable software design and the establishment of an experimental platform. © 2024 IEEE.

关键词： Gallium nitride

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Regional optimal scheduling of distribution network based on soft open point 10

Regional optimal scheduling of distribution network based on...

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10th IEEE International power Electronics and Motion control Conference, IPEMC 2024 ECCE Asia

作者： Zhang, Jiamei Sun, Kai Tsinghua University State Key Lab of Power System Operation and Control Beijing100084 China

ISBN: (纸本)9798350351330

The proliferation of distributed photovoltaics and electric vehicles in distribution network (DN) has led to differentiation of the same region, which may result in voltage exceeding the limits and unbalanced branch flow. At the same time, soft open point (SOP) is replacing traditional interconnect switches with greater flexibility and controllab.lity. This paper proposes a SOP based regional balanced optimization scheduling method for distribution networks. In the optimal model, the distribution network division method is proposed based on the sensitivity analysis and system general controllab.e capability index. An optimization model is constructed to minimize the operation costs within the region while the voltage is within the safe range based on the active and reactive power control of SOPs. The nonlinear factors are converted into linearized based on piecewise linearization and second-order cone optimization methods. The superiority of the proposed method is proved through comparative case analysis. © 2024 IEEE.

关键词： Electric power distribution

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State Identification of power system Based on Visual Geometric Group Network 4

State Identification of Power System Based on Visual Geometr...

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2022 4th International Conference on New Energy system and Electrical Engineering, NESEE 2022

作者： Yang, Jing Meng, Runquan Shanxi Key Lab of Power System Operation and Control Taiyuan University of Technology Taiyuan030024 China

Accurate and timely identification of power system operation states are requisite for taking control strategies and ensuring power system security. With the high grid penetration of renewable energy generation and wide application of power electronic equipment, power system is becoming more complicated and facing more uncertainties. Traditional model based power system state identification methods are faced with challenges and data driven methods have great prospects. This paper proposes a new data-driven method for identifying power system operating states based on visual geometric group network VGG16 (16-layer Visual Geometry Group (VGG16). Firstly, the Lasso algorithm is used to select the operating state features of the power system to realize the features dimensionality reduction. Then, the weights of the loss functions are adjusted according to the difficulty of model for identifying power system states. Finally, the IEEE39 node system is used as an example, the effectiveness and robustness of the proposed method is verified. © Published under licence by IOP Publishing Ltd.

关键词： Geometry

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Study on Wind Speed Model Considering Flow Around the Tower and Its Impact on Output power of Wind Turbine

Study on Wind Speed Model Considering Flow Around the Tower ...

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2019 IEEE Sustainable power and Energy Conference, iSPEC 2019

作者： Chang, Xiao Li, Huipeng An, Qi Liu, Yizhao Li, Shengwen Wang, Hao Taiyuan University of Technology State Grid Shanxi Electric Power Research Institute Shanxi Key Lab of Power System Operation and Control Taiyuan China Taiyuan University of Technology State Grid Jinzhong Power Supply Company Shanxi Key Lab of Power System Operation and Control Jinzhong China

ISBN: (纸本)9781728149301

A downstream wind turbine experiences a decrease in power output due to wind speed weakening caused by the shelter of tower. In order to calculate the effect on WTG's output power quantitatively caused by the shelter of tower, a wind speed variation model of tower is proposed. The presented model is used to evaluate the effect of the flow around the tower on WTG's output power, which takes into account the wake effect, mountain terrain and random wind direction. The output power of wind turbines is calculated by using simulation method with considering the flow around the tower effect. Results are compared with the actual monitoring data of a wind farm in Shanxi, and it shows that the influence of flow around the tower on WTG cannot be ignored in some specific conditions. Therefore, the research can provide theoretical guidance for micro site selection of wind turbine, which means that it's necessary to evaluate the influence of the flow around the tower on power output model of WTG. © 2019 IEEE.

关键词： Wind turbines

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Risk assessment of cascading failures in power grid based on complex network theory 14

Risk assessment of cascading failures in power grid based on...

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14th International Conference on control, Automation, Robotics and Vision, ICARCV 2016

作者： Yanbing, Jia Ruiqiong, Liu Shanxi, Han Xiaoqing Peng, Wang Key Lab. of Power System Operation and Control Taiyuan University of Technology Taiyuan China School of Electrical and Electronic Engineering Nanyang Technological University Singapore Singapore

ISBN: (纸本)9781509035496

Cascading failure is an intrinsic threat of power grid to cause enormous cost of society, and it is very challenging to be analyzed. The risk of cascading failure depends both on its probability and the severity of consequence. It is impossible to analyze all of the intrinsic attacks, only the critical and high probability initial events should be found to estimate the risk of cascading failure efficiently. To recognize the critical and high probability events, a cascading failure analysis model for power transmission grid is established based on complex network theory (CNT) in this paper. The risk coefficient of transmission line considering the betweenness, load rate and changeable outage probability is proposed to determine the initial events of power grid. The development tendency of cascading failure is determined by the network topology, the power flow and boundary conditions. The indicators of expected percentage of load loss and line cut are used to estimate the risk of cascading failure caused by the given initial malfunction of power grid. Simulation results from the IEEE RTS-79 test system show that the risk of cascading failure has close relations with the risk coefficient of transmission lines. The value of risk coefficient could be useful to make vulnerability assessment and to design specific action to reduce the topological weakness and the risk of cascading failure of power grid. © 2016 IEEE.

关键词： Risk assessment

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Reliability evaluation of transmission system based on vulnerability analysis

Reliability evaluation of transmission system based on vulne...

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2016 International Conference on Probabilistic Methods Applied to power systems, PMAPS 2016

作者： Yanbing, Jia Haidan, He Xiaoqqing, Han Peng, Wang Shanxi Key Lab. of Power System Operation and Control Taiyuan University of Technology Taiyuan China School of Electrical and Electronic Engineering Nanyang Technological University Singapore

ISBN: (纸本)9781509019700

Reliability evaluation combines the concept of severity of the accident consequence and the likelihood of it occurring. The severity of the accident consequence caused by transmission lines malfunction has rarely been considered in the existing contingency screening technique. This paper proposed a fast contingency filtering technique for transmission system reliability evaluation based on vulnerability analysis. The influence of faulty transmission lines on the severity of accident consequence is described by functional factors based on the vulnerability analysis. The sequence of transmission lines is ordered by the severity coefficients determined by state probabilities or functional factors of the faulty lines or both of them. Contingency states are searched and ranked based on the sequence of transmission lines. Three severity coefficients for a line are defined and examined based on reliability and functional factors. The merits of the proposed techniques and severity coefficients are validated by evaluating the IEEE-RTS79 test system. © 2016 IEEE.

关键词： Electric lines

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Directional Beamforming for High-Speed Railway Communications with Frequency Offset Precorrection

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Chinese Journal of Electronics 2014年第1期23卷 163-168页

作者： CAO Yuan WEN Yinghong XU Wei XIE Xin School of Electronics and Information Engineering National Engineering Research Center of Rail Transportation Operation and Control System Beijing Jiaotong University State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University National Mobile Communications Research Lab. Southeast University

This paper considers a multi-antenna transmission strategy for high speed railway communications. In order to achieve better performance than conventional space-frequency block coding schemes, we propose a directional beamforming strategy for the High-speed railway(HSR) communication by exploiting some characteristic of the railway system including predetermined moving tracks and real-time positioning information. Moreover,for alleviating the effect of Doppler shift due to the moving train, a frequency offset precorrection method is also incorporated with direction beamforming. Theoretical Signalto-noise ratio(SNR) gain of the proposed beamforming scheme over traditional HSR communication schemes is also derived for illustrating the performance *** results verify the effectiveness of our proposed scheme even with some kind of imperfect position information availab.e at the transmitter.

关键词： Multiple-input multiple-output(MIMO) Directional beamforming High-speed railway communications Frequency offset precorrection

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