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IEEE Student Conference on Electric Machines and systems

作者： Chang Liu Lin Xu Wei Wei Yingdong Wei Hua Yang Xueyuan Liu Yi Zhang Ying Wang Electric Power Research Institute of State Grid Sichuan Electric Power Company Chengdu China State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China School of Electrical Engineering and Automation Fuzhou University Fuzhou China College of Electrical Engineering Sichuan University Chengdu China

ISBN: (数字)9781728156224

ISBN: (纸本)9781728156231

A shunt unified power quality controller (S-UPQC) is developed and has been tested in the field in order to confirm its performance at mitigating voltage sags for sensitive power consumers. The S-UPQC keeps the magnitude of the voltage supply for power consumers constant by acting as a voltage source when voltage sags occur in the power grid. In this paper, a smooth switching strategy is designed to smooth the voltage disturbance of power consumers when the power supply switches between the S-UPQC and the grid. simulation results are presented to show its high performance. A prototype of S-UPQC is developed and a field test has been conducted. During its operation, the performance of the SUPQC at mitigating voltage sags within actual power systems is confirmed.

关键词： simulation power quality Prototypes Switches Production Reliability Switching circuits

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Longitudinal Protection Method based on Voltage Waveform Comparison for AC / DC Hybrid system

Longitudinal Protection Method based on Voltage Waveform Com...

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IEEE/IAS Industrial and Commercial power system Asia (I&CPS Asia)

作者： Hongzhe Zhang Wei Cong Hao Kong Ming Chen Zhen Wei Ministry of Education Key Laboratory of Power System Intelligent Dispatch and Control (Shandong University) Jinan China Qingdao Power Supply Company State Grid Shandong Electric Power Company Qingdao China

ISBN: (数字)9781728143033

ISBN: (纸本)9781728143040

When the tie line of the AC/DC hybrid system fails, the change of the electrical quantity on the inverter side is different from that of the traditional infinite AC power source. Sensitivity and reliability of traditional relay protection methods will be affected. A longitudinal protection method for AC / DC hybrid system based on voltage waveform comparison is proposed. The method bases on the conclusion that the waveform characteristics of the reference voltage and the measuring voltage are different in the case of internal and external faults, roughly determine the fault location through the Pearson correlation coefficient. Use longitudinal protection logic to give more accurate judgment results. The simulation results of PSCAD model show that the scheme in this paper can accurately identify the fault of the tie line of the AC/DC hybrid system, and has high reliability and good applicability.

关键词： Voltage measurement Mathematical model Hybrid power systems Inverters Sensitivity Fault location

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A Hybrid Phase-Locked Loop for the Transient Stability Enhancement of Voltage Source Converters

A Hybrid Phase-Locked Loop for the Transient Stability Enhan...

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International Conference on power system Technology (powerCON)

作者： Zijun Wang Kehao Zhuang Hui Liu Xuekun Cheng Shiyao Qin Huanhai Xin Polytechnic Institute of Zhejiang University Zhejiang University Hangzhou P. R. China College of Electrical Engineering Zhejiang University Hangzhou P. R. China Grid-connected Operation Technology For Wind-Solar-Storage Hybrid System State Grid Corporation Key Laboratory State Grid Jibei Electric Power Research Institute Beijing China State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems) China Electric Power Research Institute Beijing China

ISBN: (纸本)9781665407380

Phase-locked loop (PLL) is widely used in voltage source converter (VSC) to synchronize with grid. This paper comprehensively analyzes the transient stability of the PLL-VSC and obtains the VSC’s instability characteristics similar to the synchronous generator. The instability of VSC is mainly caused by insufficient deceleration area and instability without equilibrium point. To improve the transient stability of VSC, a hybrid PLL is proposed. This method dynamically compensates the phase of the PLL to improve the transient stability performance of the system without obtaining the specific parameters of the grid line. The phase compensation of PLL creates new equilibrium points to solve the most problem of insufficient deceleration area or no equilibrium point. Time-domain simulations are given to verify the effectiveness of the theoretical analysis.

关键词： power system dynamics Voltage power system stability Stability analysis Synchronous generators Synchronization Phase locked loops

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Source-Grid-Load Synergized Transmission Planning

Source-Grid-Load Synergized Transmission Planning

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Chinese Automation Congress (CAC)

作者： Donglei Sun Qingzhi Jian Xueliang Li Long Zhao Yiqun Wang Dong Liu Ying Mu Xueshan Han Mingqiang Wang Economic & Technology Research Institute State Grid Shandong Electric Power Company Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China

ISBN: (数字)9781728176871

ISBN: (纸本)9781728176888

A source-grid-load synergized transmission planning method is proposed to deal with the large-scale wind power accommodation problem. Through integration of the optimization of demand side response mechanism and thermal power units' flexibility reformation schemes into transmission planning optimization model, the source-grid-load flexibility resources of power systems are optimized to promote wind power utilization. A joint optimization mathematical model for the thermal power units' flexibility reformation schemes, demand side response mechanism and optimization of transmission network is constructed. The proposed mathematical model is transformed into a mixed-integer linear programming model and solved by mixed-integer linear programming algorithm. Case studies are conducted to illustrate the effectiveness of the proposed source-grid-load synergized transmission planning method, and the numerical results show that the proposed method can guarantee the expected wind power utilization.

关键词： Planning Generators power transmission lines Mathematical model Investment power grids Wind power generation

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Rapid improvement of PM2.5 pollution and associated health benefits in China during 2013–2017

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Science China Earth Sciences 2019年第12期62卷 1847-1856页

作者： Tao XUE Jun LIU Qiang ZHANG Guannan GENG Yixuan ZHENG Dan TONG Zhu LIU Dabo GUAN Yu BO Tong ZHU Kebin HE Jiming HAO Department of Earth System Science Tsinghua UniversityBeijing 100084China College of Environmental Science and Engineering Peking UniversityBeijing 100871China Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China

Exposure to fine particulate matter(PM2.5)is known to harm public *** China,after implementation of aggressive emissions control measures under the Action Plan of Air Pollution Prevention and control(2013-2017),air quality has significantly *** this work,we investigated changes in PM2.5 exposure and the associated health impacts in China for the period *** used an optimal estimator of PM2.5 combining in-situ observations,satellite measurements,and simulations from a chemical transport model to derive the spatial and temporal variations in PM2.5 exposure,and then used welldeveloped exposure-response functions to estimate the premature deaths attributable to PM2.5 *** found that national population-weighed annual mean PM2.5 concentrations decreased from 67.4μgm-3 in 2013 to 45.5μgm-3 in 2017(32%reduction).This rapid decrease in PM2.5 pollution led to a 14%reduction in premature deaths due to long-term *** estimated that,during 2013-2017,the premature deaths attributable to long-term PM2.5 exposure decreased from 1.2 million(95%CI:1.0,1.3;fraction of total mortality:13%)in 2013 to 1.0 million(95%CI:0.9,1.2;10%)in *** the rapid decrease in annual mean PM2.5 concentrations,health benefits associated with reduced long-term exposure were limited,because for many cities,the PM2.5 levels remain at the portion where the exposure-response function is less steeper than that at the lowconcentration *** also found that the deaths associated with acute exposure decreased by 61%during 2013-2017 due to rapid reduction in the number of heavily polluted *** results confirm that clean air policies in China have mitigated the air pollution crisis;however,continuous emissions reduction efforts are required to protect citizens from air pollution.

关键词： Air quality improvement Health impact assessment Action plan of air pollution prevention and control PM2.5 Mortality

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Stability study of electromagnetic SD oscillator vibration isolation system considering nonlinear characteristics of electromagnetic force under state feedback control

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Chaos, Solitons and Fractals 2025年 199卷

作者： Wang, Meiqi Zu, Qian Wang, Ruichen Qin, Chengwei Liu, Pengfei School of Mechanical Engineering Shijiazhuang Tiedao University Shijiazhuang050043 China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang050043 China Hebei Key Laboratory of Mechanical Power and Transmission Control Shijiazhuang Tiedao University Shijiazhuang050043 China CRRC Tangshan Co. Ltd Tangshan064000 China

To enhance the robustness of SD oscillator system, an electromagnet with state feedback control is introduced above the oscillator, considering the nonlinear characteristics of the electromagnetic force. Initially, the system's steady-state amplitude-frequency response, phase-frequency response, and backbone curve are determined using the averaging method. These results are compared with the traditional SD oscillator, analyzing the influence of state feedback parameter on vibration isolation effectiveness and acceleration transmissibility. Subsequently, differences in bifurcation diagrams between the conventional SD oscillator and the electromagnetic SD oscillator are examined, focusing on how parameters affect the system's dynamic bifurcation characteristics. Finally, employing the cell mapping method, the global bifurcation characteristics are analyzed, investigating how parameters influence the number of attractors and the area of their attraction domains. The research indicates that the system exhibits rich nonlinear characteristics, and that appropriate selection of state feedback parameters can effectively suppress chaos and bifurcations induced by external excitation, thereby enhancing the system's stability and vibration isolation performance. © 2025 Elsevier Ltd

关键词： state feedback

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Tertiary regulation of cascaded run-of-the-river hydropower in the islanded renewable power system considering multi-timescale dynamics

arXiv

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arXiv 2020年

作者： Qiu, Yiwei Lin, Jin Liu, Feng Dai, Ningyi Song, Yonghua Chen, Gang Ding, Lijie State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing100087 China State Key Laboratory of Internet of Things for Smart City University of Macau 999078 China State Grid Sichuan Electric Power Research Institute Chengdu610000 China

To enable power supply in rural areas and to exploit clean energy, fully renewable power systems consisting of cascaded run-of-the-river hydropower and volatile energies such as pv and wind are built around the world. In islanded operation mode, the primary and secondary frequency control, i.e., hydro governors and automatic generation control (AGC), are responsible for the frequency stability. However, due to limited water storage capacity of run-of-the-river hydropower and river dynamics constraints, without coordination between the cascaded plants, the traditional AGC with fixed participation factors cannot fully exploit the adjustability of cascaded hydropower. When imbalances between the volatile energy and load occur, load shedding can be inevitable. To address this issue, this paper proposes a coordinated tertiary control approach by jointly considering power system dynamics and the river dynamics that couples the cascaded hydropower plants. The timescales of the power system and river dynamics are very different. To unify the multi-timescale dynamics to establish a model predictive controller that coordinates the cascaded plants, the relation between AGC parameters and turbine discharge over a time interval is approximated by a data-based second-order polynomial surrogate model. The cascaded plants are coordinated by optimising AGC participation factors in a receding-horizon manner, and load shedding is minimised. simulation of a real-life system with real-time pv data collected on site shows the proposed method significantly reduces load loss under pv volatility. Copyright © 2020, The Authors. All rights reserved.

关键词： Electric load shedding

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Distributed power Service Restoration Method of Distribution Network with Soft Open Point

Distributed Power Service Restoration Method of Distribution...

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IEEE/IAS Industrial and Commercial power system Asia (I&CPS Asia)

作者： Shoujing Sun Wei Cong Yaru Sheng Ming Chen Zhen Wei Key Laboratory of Power System Intelligent Dispatch and Control (Shandong University) Jinan China Key Laboratory of Smart Grid of Ministry of Education (Tianjin University) Tianjin China Qingdao Power Supply Company Shandong Electric Power Company State Grid Qingdao China

ISBN: (数字)9781728143033

ISBN: (纸本)9781728143040

Soft open point (SOP) is applied to the power service restoration of the distribution network because of the advantages of flexible control mode and optimizing the operation of the distribution network. Taking advantage of parallel collaborative between independent peer smart terminals unit (STU) in distribution network and information interaction ways of working, distributed power service restoration method of distribution network considering soft open point is put forward, which brings the superiority of SOP in the aspect of power service restoration into full play and avoids the problem of large information collection and calculation in the centralized power service restoration method. Firstly, the structure, control mode and power service restoration model of SOP are introduced, and then the distributed power service restoration method of distribution network with SOP is described, which mainly includes distributed network topology search and the expression and calculation of constraint conditions. Finally, a numerical simulation is carried out to verify the effectiveness of the proposed method.

关键词： Switches power supplies Network topology Topology Impedance Voltage control Switching circuits

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Historical trajectory, current status, and future challenges of powder engines and propellant supply technologies: A comprehensive review

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Defence Technology 2025年

作者： Guanlong Ren Haijun Sun Chunbo Hu Yuxin Yang Chao Li Yihua Xu Rui Xue Xiaoan Hu Jiangxi Key Laboratory of Green General Aviation Power School of Power and Energy Nanchang Hangkong University Nanchang 330063 China State Key Laboratory of Pulp and Paper Engineering South China University of Technology Guangzhou 510640 China National Key Laboratory of Solid Rocket Propulsion Northwestern Polytechnical University Xi’an 710072 China Institute of Xi'an Aerospace Solid Propulsion Technology Xi’an 10025 China Unmanned System Research Institute Northwestern Polytechnical University Xi’an 710072 China State Key Laboratory for Strength and Vibration of Mechanical Structures Shanxi Engineering Laboratory for Vibration Control of Aerospace Structures School of Aerospace Xi'an Jiaotong University Xi'an 710049 China

Powder engine as a novel type of engine using high-energy metal powder as fuel and gas, liquid, or solid as oxidizer. These engines exhibit remarkable adaptability, flexible thrust regulation, and multi-pulse start-stop, which have significant application potentials in the fields of near-Earth space development, space propulsion systems, and deep-sea exploration. The scope of this review encompasses the classification and application of powder engines, the classification of powdered fuel supply systems, and the prospective trajectories and pivotal challenges of powder engines and fuel supply technologies. This work points out that although certain ground-based experimental challenges on powder engines have been solved, the relative technology remains in the nascent stages of feasibility demonstration and testing. The pneumatic and motor-driven piston methods currently dominate as the primary means for supplying fuel, and the structure of the piston and intake should be further optimized in the future to promote fuel fluidization and delivery efficiency. The adaptability of powder engines and powdered fuels under different pre-treatment and loading methods should be evaluated. Furthermore, the stability of powdered fuel delivery across varying operational environments, the accuracy of CFD modeling, and the precision of mass flow rate measurement and prediction technologies necessitate further enhancement and refinement. These advancements are crucial for the maturation of powder engine technology and its integration into practical applications.

关键词： Powder engine Powdered fuel ramjet Multi-pulse ignition Thrust adjustment Mass flow rate regulation Gas-solid two-phase flow

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Research on the Strategy of Energy Storage system Participating in the Secondary Frequency Regulation of power Grid Based on Fuzzy control

Research on the Strategy of Energy Storage System Participat...

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第33届中国控制与决策会议

作者： Ya Zeng Yan Zhao Tieyan Zhang Yuri Wang Qianzhi Shao Yuanzhuo Du School of Electric Power Shenyang Institute of Engineering School of Renewable Energy Shenyang Institute of Engineering Key Laboratory of Regional Multi-energy System Integration and Control Liaoning Province School of Automation and Electrical Engineering Shenyang Ligong University Industrial Branch State Grid Liaoning Electric Power Supply Co.Ltd. Fengman Training Center State Grid Xinyuan Company

The continuous development of science and technology has led to great changes in the demand for loads in the power system,placing higher demands on the grid for frequency *** disadvantages of traditional FM generators such as slow response speed and dead zone in frequency modulation are becoming more and more ***,the energy storage system has timely tracking,reversible charging and discharging,and rapid *** auxiliary grid frequency modulation through the energy storage system helps to maintain the active power balance of the power system,improve and increase *** frequency adjustment capability of the system provides reliable support for the safe and efficient operation of the power *** paper first analyses the mechanism of secondary frequency regulation of energy storage assisted power grid and establishes an equivalent model of secondary frequency regulation of thermal power units assisted by energy storage *** addition,an energy storage system-assisted grid secondary frequency regulation control strategy based on double-layer fuzzy control is designed to address the shortcomings of the existing energy storage assisted grid frequency regulation control ***,the simulation analysis of the frequency regulation effect is carried out to verify the rationality and effectiveness of the proposed control strategy.

关键词： Fuzzy control Energy Storage system Secondary Frequency Modulation

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