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International Conference on power Electronics and Motion control (IPEMC)

作者： Nianzhou Liu Mingqi Zhang Jupeng Pang Pengfei Xie Changqing Qiu Kui Wang Yongdong Li State Key Laboratory of Electromagnetic Energy Wuhan China Department of Electrical Engineering State Key Laboratory of Power System Operation and Control Tsinghua University Beijing China

ISBN: (数字)9798350351330

ISBN: (纸本)9798350351347

This paper analyzes the device voltage overshoot in the symmetrical hybrid five-level converter. Owing to the presence of stray inductance, the voltage that the power devices need to withstand during switching operations may exceed their rated values. To address this issue, a device voltage overshoot suppression method suitable for the topology is proposed in this paper. This method suppresses SiC MOSFET voltage overshoot through adjustment of switching speed and the utilization of snubber capacitance, and it employs the design of RC and dual-RCD snubber circuits to suppress Si IGBT voltage overshoot. Simulation and experimental results certificate the effectiveness of the proposed method in suppressing device voltage overshoot.

关键词： Insulated gate bipolar transistors MOSFET Silicon carbide Snubbers Switches Silicon Topology

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STDHL: Spatio-Temporal Dynamic Hypergraph Learning for Wind power Forecasting

arXiv

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arXiv 2024年

作者： Dong, Xiaochong Zhang, Xuemin Yang, Ming Mei, Shengwei State Key Laboratory of Power System Operation and Control Department of Electrical Engineering Tsinghua University Beijing100084 China Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Jinan250061 China

Leveraging spatio-temporal correlations among wind farms can significantly enhance the accuracy of ultra-short-term wind power forecasting. However, the complex and dynamic nature of these correlations presents significant modeling challenges. To address this, we propose a spatio-temporal dynamic hypergraph learning (STDHL) model. This model uses a hypergraph structure to represent spatial features among wind farms. Unlike traditional graph structures, which only capture pair-wise node features, hypergraphs create hyperedges connecting multiple nodes, enabling the representation and transmission of higher-order spatial features. The STDHL model incorporates a novel dynamic hypergraph convolutional layer to model dynamic spatial correlations and a grouped temporal convolutional layer for channel-independent temporal modeling. The model uses spatio-temporal encoders to extract features from multi-source covariates, which are mapped to quantile results through a forecast decoder. Experimental results using the GEFCom dataset show that the STDHL model outperforms existing state-of-the-art methods. Furthermore, an in-depth analysis highlights the critical role of spatio-temporal covariates in improving ultra-short-term forecasting accuracy. Copyright © 2024, The Authors. All rights reserved.

关键词： Wind forecasting

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Topology Optimization for Harmonic Excitation Structures with Minimum Length Scale control Using the Discrete Variable Method

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Computer Modeling in engineering & Sciences 2023年第6期135卷 1941-1964页

作者： Hongliang Liu Peijin Wang Yuan Liang Kai Long Dixiong Yang Key Laboratory of Liaoning Province for Composite Structural Analysis of Aerocraft and Simulation College of Aerospace EngineeringShenyang Aerospace UniversityShenyang110136China State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering MechanicsDalian University of TechnologyDalian116023China State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing102206China

Continuumtopology optimization considering the vibration response is of great value in the engineering structure *** aimof this studyis toaddress the topological designoptimizationof harmonic excitationstructureswith minimumlength scale control to facilitate *** topology design based on discrete variables is proposed to avoid localized vibration modes,gray regions and fuzzy boundaries in harmonic excitation topology *** topological design model and sensitivity formulation are *** requirement of minimum size control is transformed into a geometric constraint using the discrete ***,thin bars,small holes,and sharp corners,which are not conducive to the manufacturing process,can be eliminated from the design *** present optimization design can efficiently achieve a 0–1 topology configuration with a significantly improved resonance frequency in a wide range of excitation ***,the optimal solution for harmonic excitation topology optimization is not necessarily symmetric when the load and support are symmetric,which is a distinct difference fromthe static optimization ***,one-half of the design domain cannot be selected according to the load and support *** examples are presented to demonstrate the effectiveness of the discrete variable design for excitation frequency topology optimization,and to improve the design manufacturability.

关键词： Discrete variable topology optimization harmonic excitation minimumlength scale control geometric constraint manufacturability

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control and Stability of Large-scale power system with Highly Distributed Renewable Energy Generation:Viewpoints from Six Aspects

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CSEE Journal of power and Energy systems 2023年第1期9卷 8-14页

作者： Qing-Hua Wu Anjan Bose Chanan Singh Joe H.Chow Gang Mu Yuanzhang Sun Zhaoxi Liu Zhigang Li Yang Liu School of Electric Power Engineering South China University of TechnologyGuangzhou 510640China School of Electrical Engineering&Computer Science Washington State UniversityPullmanWA 99164USA Department of Electrical and Computer Engineering Texas A&M UniversityCollege StationTX 77843USA Department of Electrical Computer and Systems EngineeringRensselaer Polytechnic Institute(RPI)TroyNYUSA Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology Ministry of Education(Northeast Electric Power University)Jilin 132012China School of Electrical Engineering and Automation Wuhan UniversityWuhan 430072China

power systems are moving toward a low-carbon or carbon-neutral future where high penetration of renewables is *** conventional fossil-fueled synchronous generators in the transmission network being replaced by renewable energy generation which is highly distributed across the entire grid,new challenges are emerging to the control and stability of large-scale power *** analysis and control methods are needed for power systems to cope with the ongoing *** the CSEE JPES forum,six leading experts were invited to deliver keynote speeches,and the participating researchers and professionals had extensive exchanges and discussions on the control and stability of power ***,potential changes and challenges of power systems with high penetration of renewable energy generation were introduced and explained,and advanced control methods were proposed and analyzed for the transient stability enhancement of power grids.

关键词： Distributed energy resources high converter penetration power system control renewable energy generation stability control transient stability

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Fault Diagnosis of Rotor Inter-turn Short-Circuit in Pumped-Storage Generator Motor Based on No-Load Characteristic Curve 17th

Fault Diagnosis of Rotor Inter-turn Short-Circuit in Pumped-...

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17th Annual Conference of China Electrotechnical Society, CES 2022

作者： Li, Deqi Li, Yonggang Qi, Peng Chu, Wencong State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources Department of Electrical Engineering North China Electric Power University Baoding071003 China

ISBN: (纸本)9789819903566

A large proportion of rotor inter-turn short-circuit faults occur in large motors, which can pose a threat to the safe and stable operation of the unit if they are not detected and dealt with in time. A fault diagnosis method based on reverse no-load curve fitting is proposed for the rotor winding inter-turn short circuit problem of pumped storage power generation motors. Firstly, a mathematical model of the excitation electromotive force is established based on the vector relationship of the synchronous motor, using the motor’s own parameters and basic operating data. Based on this model, the reverse no-load curve is used to find the excitation current under normal operating conditions corresponding to the excitation electromotive force. The calculated excitation current is then compared with the actual excitation current, and the severity of the short circuit is judged according to the magnitude of the relative change. The method is independent of the motor’s operating condition and, without the need for additional sensing devices, can be monitored online in real time. Finally, real-time data and simulation models of the pumped storage generator are used to verify the correctness of the theoretical analysis and the effectiveness of the diagnostic method. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Curve fitting

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Short-Term Photovoltaic Prediction Based on Transfer Learning and LSTM

Short-Term Photovoltaic Prediction Based on Transfer Learnin...

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IEEE Conference on Energy Internet and Energy system Integration (EI2)

作者： Tianyu Zhang Kedi Zheng Qixin Chen Department of Electrical Engineering State Key Laboratory of Power System Operation and Control Tsinghua University Beijing China

With the proposal of carbon peaking and carbon neutrality goals, the proportion of renewable energy generation continues to increase and the number of new photovoltaic power stations is growing rapidly. Accurate photovoltaic power prediction is of great significance for the safe, stable and operation of power system. In order to solve the problem of insufficient historical data of newly constructed PV power plants, this paper proposes a short-term PV power prediction model based on Long Short Term Memory and transfer learning. The model uses meteorological data, numerical weather forecast data and PV power as features. According to the transfer learning theory, the Long Short Term Memory model is pre-trained using the historical data of other previously-built PV power plants, and then a small amount of local operation data is used to fine-adjust the model. Case study based on Hebei open source photovoltaic and meteorological data set proves that the proposed transfer learning model can effectively improve the short-term PV power prediction accuracy, and the MAPE can be improved by up to 15%.

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Optimal Design of Full-Bridge Three-Level LLC Converter Based on Time-Domain Analysis

Optimal Design of Full-Bridge Three-Level LLC Converter Base...

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power Electronics and Application Symposium (PEAS), IEEE International

作者： Zengyang Liu Kai Sun Zheyuan Yi Department of Electrical Engineering State Key Laboratory of Power System Operation and Control Tsinghua University Beijing China

Fully DC wind turbine generator system is a promising substitute for conventional AC one. In the system, the LLC step-up converter plays a key role. Mode analysis and time-domain expressions can provide more accurate estimation of the resonant performance than the conventional First Harmonic Analysis method. The circuit works at different modes as the load rate varies. This paper categorizes these resonant behaviors into four modes, with time-domain expressions of each mode obtained. The variation regular of these modes is given and is applied in the program to realize recognizing the working mode automatically. The simulation and experiment have verified the effectiveness of the proposed method.

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A Parameter Design Strategy Based on operation Mode Analysis Method for LCC Converter Used in High-Voltage DC power Supply

A Parameter Design Strategy Based on Operation Mode Analysis...

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PELS Students and Young Professionals Symposium (SYPS), IEEE

作者： Kai Zhang Hanyu Liu Kai Sun Department of Electrical Engineering State Key Laboratory of Power System Operation and Control Tsinghua University Beijing China

LCC converter has the characteristics of both series resonance and parallel resonance, which is often used as the front stage of high voltage DC power supply. A three-stage boosting circuit using LCC converter, high-frequency transformer and voltage multiplier circuit is applied to a high-voltage source. In order to realize the design of core resonant cavity parameters, firstly, the working process of LCC converter in continuous current mode (CCM) is solved by using the operation mode analysis method. On this basis, considering the integrated design of stray parameters such as stray capacitance and leakage inductance of high-frequency transformer, the resonant cavity design flow of LCC converter is given. Finally, an experimental platform is built to test the LCC converter and the whole boosting circuit, and the voltage transmission ratio of 20V/10kV is verified.

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Sharing Economy in Local Energy Markets

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Journal of Modern power systems and Clean Energy 2023年第3期11卷 714-726页

作者： Zhaoyuan Wu Jianxiao Wang Haiwang Zhong Feng Gao Tianjiao Pu Chin-Woo Tan Xiupeng Chen Gengyin Li Huiru Zhao Ming Zhou Qing Xia School of Economics and Management North China Electric Power UniversityBeijing 102206China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China National Engineering Laboratory for Big Data Analysis and Applications Peking UniversityBeijing 100871China State Key Lab of Power Systems Department of Electrical EngineeringTsinghua UniversityBeijing 100084China Department of Industrial Engineering and Management College of EngineeringPeking UniversityBeijing 100871China China Electric Power Research Institute Beijing 100192China Department of Civil and Environmental Engineering Stanford UniversityPalo AltoCA 94305USA Engineering and Technology Institute Groningen University of Groningen9742 AG Groningenthe Netherlands

With an increase in the electrification of end-use sectors,various resources on the demand side provide great flexibility potential for system operation,which also leads to problems such as the strong randomness of power consumption behavior,the low utilization rate of flexible resources,and difficulties in cost *** the core idea of“access over ownership”,the concept of the sharing economy has gained substantial popularity in the local energy market in recent ***,we provide an overview of the potential market design for the sharing economy in local energy markets(LEMs)and conduct a detailed review of research related to local energy sharing,enabling technologies,and potential *** paper can provide a useful reference and insights for the activation of demand-side flexibility ***,this paper can also provide novel insights into the development and further integration of the sharing economy in LEMs.

关键词： Energy sharing flexibility potential local energy market information and communication technology sharing economy

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Energy Storage Participation in Peak Shaving Market operation Strategy Based on system Supply and Demand Margin 11

Energy Storage Participation in Peak Shaving Market Operatio...

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11th China International Conference on Electricity Distribution, CICED 2024

作者： Qi, Houyu Zhang, Haibo Huang, Songtao Shang, Guozheng Duan, Rui North China Electric Power University Beijing State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources Beijing102206 China State Grid Inner Mongolia Eastern Electric Power Co. Ltd. Dispatching Control Center Hohhot010010 China The State Key Lab of New Energy Power System Department of Electrical Engineering North China Electric Power University Beijing102206 China

ISBN: (纸本)9798350368345

Existing energy storage operation strategies take renewable energy unit consumption as the main goal, and often operate in conjunction with renewable energy projects, resulting in low energy storage utilization rate and insufficient driving force for energy storage operators to develop independent energy storage. However, with the implementation of independent energy storage operation support policies, the regional peak shaving service market gradually expands to include energy storage. Energy storage can have a positive impact on the economy of the power system as well as its utilization rate. According to the historical East Inner Mongolia power Grid operational data, this paper established the annual chronological operation simulation model of peak shaving market participation by energy storage. By analyzing and summarizing the results of energy storage operation state obtained from the annual operation simulation, the energy storage operation strategy of taking part in peak shaving market based on system supply and demand margin was proposed. The two charge and two discharge or three charge and two discharge strategy, which are the most common operation modes of operation simulation, are compared with the proposed operation strategy. It is evident that energy storage's involvement in system peak shaving can lessen thermal units' peak shaving pressure, enhance the benefits of energy storage as a market participant for auxiliary services and the system's overall efficiency in terms of electricity consumption. © 2024 IEEE.

关键词： Charge storage

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