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Dynamic Security Assessment Method of power system Based on Improved XGBoost

Journal of Physics: Conference Series 2021年第1期1750卷

作者： Jihong Ren Key Laboratory of Modern Power System Simulation and Control and Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin Jilin132012 China Department of Electrical Engineering Northeast Electric Power University Jilin Jilin 132012 China

With the deployment of wide-area measurement systems (WAMS) equipment, dynamic security assessment (DSA) based on artificial intelligence (AI) has more and more advantages. For the power system, the number of transient stable cases is much larger than that of unstable cases, which leads to insufficient learning of unstable cases and affects the evaluation effect of the model. In addition, during the stability assessment process of the power system, the misjudgment cost of unstable case is much higher than that of stable case. Based on the above two points, we proposed a DSA method of power system based on improved XGBoost. The proposed method introduces the weight adjustment factor into the loss function to balance the quantity variance of two type cases and the difference of misjudgment cost, which greatly reduces the misjudgment rate of unstable samples. The test results on IEEE 16-machine 68-bus test system and IEEE 50-machine 145-bus test system show that the proposed method can have higher recognition of the unstable samples and can be applied to DSA.

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Short-term Optimized Operation of Multi-energy power system Based on Complementary Characteristics of power Sources

Short-term Optimized Operation of Multi-energy Power System ...

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2019 IEEE PES Innovative Smart Grid Technologies Asia, ISGT 2019

作者： Xiao, Bai Zheng, Jia Yan, Gangui Shi, Yonggang Jiao, Mingxi Wang, Yao Dong, Ling Wang, Maochun Yang, Hongzhi Key Laboratory of Modern Power System Simulation and Control Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin China Tonghua Power Supply Company State Grid Jilin Electric Power Co. Ltd. Tonghua China Changchun Power Supply Company State Grid Jilin Electric Power Co. Ltd. Changchun China State Grid Qinghai Electric Power Company Xining China

ISBN: (纸本)9781728135205

Aiming at the problem that uncertain power sources bring fluctuation to power system and cause lots of wind and photovoltaic curtailment, a short-term optimized operation method of multi-energy power system based on complementary characteristics of power sources is presented. The complementary mechanism of multi-energy power system is established. Based on the complementary mechanism, mathematical models of complementary objectives and complementary demands are established. Define renewable energy complementary power source. To minimize complementary demands, the capacity matching ratio of hydropower in renewable energy complementary power source is determined. According to the complementary objectives, a hierarchical optimal operation strategy for multi-energy power system is proposed. Particle swarm optimization is used to solve the optimization objective function. Taking a provincial power grid in northwest China as an example, the results show that the strategy makes full use of the complementarity of power sources and has the benefit of energy saving. © 2019 IEEE.

关键词： energy conservation

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The Influence of Positive Temperature Coefficient Material on the DC Electric Field within Epoxy Composites

The Influence of Positive Temperature Coefficient Material o...

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Conference on Electrical Insulation and Dielectric Phenomena, (CEIDP)

作者： Chenyuan Teng Yuanxiang Zhou Ling Zhang Yunxiao Zhang Xuewei Wang Zixia Cheng Meng Huang China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Beijing China The Wind Solar Storage Division of State Key Laboratory of Power System and Generation Equipment School of Electrical Engineering Xinjiang University Urumqi China School of Electrical Engineering Zhengzhou University Zhengzhou China The State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing China

ISBN: (纸本)9781728195728;9781728195735

Negative temperature (NT) coefficient electrical resistivity of insulating materials causes the distortion of DC electric field, increasing the design and manufacture difficulty of HVDC equipment. The ceramic with positive temperature coefficient (PTC) electrical resistivity was doped into epoxy resin to weaken its temperature dependence of electrical resistivity (0~35 wt%). The electric field and temperature distribution under temperature gradient were simulated. The PTC effect of fillers is able to mitigate the distortion of electric field under temperature gradient, which is through the synergistic optimization of both electrical resistivity-temperature characteristic and thermal conductivity. The optimization of electric field distribution within insulation via BT60/epoxy composites has potential to be used in HVDC electrical equipment.

关键词： Temperature sensors Temperature distribution Temperature dependence Thermal resistance HVDC transmission Conductivity Thermal conductivity

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Improved active damping control strategy and closed-loop parameter design for LCL grid-connected inverter

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Journal of Physics: Conference Series 2021年第1期2030卷

作者： Qi Chen Hongbo Liu Qingxiang Hao Yikun Yin Yuanhong Li Key Laboratory of Modern Power System Simulation and Control and Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin 132012 China Zaozhuang Power Supply Company State Grid Shandong Electric Power Company Zaozhuang 277000 China Changchun Institute of Technology ChangChun 130012 China

In this paper, an active damping control strategy based on capacitance and voltage feedback is proposed to solve the resonance problem of three-phase LCL inverter grid-connected system. To solve the problem that the parameters of active damping control strategy are complicated and need to be adjusted repeatedly, a parameter design method is proposed in this paper, which is simple to implement and does not need to be adjusted repeatedly. Finally, the effectiveness of the control strategy and parameter design method is verified by experiments.

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Design of Slot Coupled Microstrip Bandpass Filter Based on Defected Ground Structure (DGS)

Design of Slot Coupled Microstrip Bandpass Filter Based on D...

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International Conference on Optical Communications and Networks (ICOCN)

作者： Xuemei ZHENG Xudong WANG Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education(Northeast Electric Power University) Jilin China College of Electrical Engineering Northeast Electric Power University Jilin China

In this paper, a slot-coupled microstrip line filter based on Defected Ground Structure (DGS) is designed. It is a band-pass filter. It is simulated by HFSS software. At the same time, the equivalent circuit of the designed filter is extracted by ADS software. The performance of the filter is verified by comparing the simulation results of the two filters.

关键词： Band-pass filters Microstrip filters Microwave filters Resonator filters Optical filters power harmonic filters Equivalent circuits

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Design of Metamaterial Microstrip Array Antenna

Design of Metamaterial Microstrip Array Antenna

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International Conference on Optical Communications and Networks (ICOCN)

作者： Xuemei ZHENG Zhiqi RONG Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education (Northeast Electric Power University) Jilin China College of Electrical Engineering Northeast Electric Power University Jilin China

In this paper, a new type of metamaterial structure based on open resonant ring is proposed. On this basis, a microstrip array antenna based on metamaterial is designed and simulated by HFSS.

关键词： Microstrip antenna arrays Microstrip antennas Metamaterials Microstrip Magnetic materials

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Feasibility Analysis of Single-end Equivalent Modeling to LCC-HVDC Transimission system

Feasibility Analysis of Single-end Equivalent Modeling to LC...

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

作者： Bin Wang Zhizhong Li Qi Guo Zhijiang Liu Shuyong Li Liu Cui Tsinghua University Beijing China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System State Key Laboratory of HVDC (Electric Power Research Institute China Southern Power Grid) Guangzhou China National Energy Power Grid Technology R&D Centre State Key Laboratory of HVDC (Electric Power Research Institute China Southern Power Grid) Guangzhou China China Southern Power Grid State Key Laboratory of HVDC (Electric Power Research Institute China Southern Power Grid) CSG Key Laboratory for Power System Simulation Electric Power Research Institute Guangzhou China

ISBN: (数字)9781728196060

ISBN: (纸本)9781728196077

The commutation failures seriously threaten the safe operation of hybrid AC/DC grid. Considering that commutation failure occurs only on the inverter side, it is very important to study the voltage controlled current source model of LCC HVDC single terminal measurement information with high equivalent accuracy, which is very important for the practicality of real-time electromagnetic transient simulation of LCC HVDC dynamic phasor model. In order to this problem, this paper further discusses the single terminal equivalent model of LCC HVDC system which does not depend on the measurement information of DC sending end AC system, and explores the estimation method of single terminal fast transient response of complex AC/DC coupling faults induced by AC side fault of LCC HVDC inverter station and participation of DC control separation. The error distribution of single terminal equivalent calculation is quantitatively analyzed to lay a foundation for the follow-up protection and control technology research.

关键词： Analytical models Solid modeling Voltage measurement HVDC transmission Estimation Inverters Voltage control

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Economic Optimal Dispatch of Grid-connected Microgrid Based on Improved Genetic Algorithm 2

Economic Optimal Dispatch of Grid-connected Microgrid Based ...

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2nd International Conference on energy, Electrical and power Engineering, CEEPE 2019

作者： Sun, Li Zhao, Shujian Ma, Chenglian Chen, Naixin Yao, Tianliang Key Laboratory of Modern Power System Simulation and Control and Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin Jilin132012 China Power Research Institute of State Grid Jilin Electric Power Co. Ltd. Changchun Jilin130021 China Changchun Power Supply Company State Grid Jilin Electric Power Co. Ltd. Changchun Jilin130000 China Gansu Electric Power Design Institute Limited Company of China Energy Construction Group Lanzhou730050 China

Nowadays, the demand for energy is expanding, the fossil resources are on the verge of exhaustion, and the ecological environment is getting worse and worse. In this form, this paper studies the economic optimal dispatch of microgrid under the background of energy saving and emission reduction. Firstly, the mathematical model of microgrid composed of distributed power, energy storage devices and loads is established. Secondly, under the background of energy saving and emission reduction, the objective function of multi-objective optimal operation of microgrid is established considering both economic and environmental aspects. Finally, the improved Genetic Algorithm is used to solve the objective function. The results of optimization can reduce microgrid system generation cost. © 2019 IOP Publishing Ltd. All rights reserved.

关键词： Genetic algorithms

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Research on Parameter Identification Method of Generator Excitation system Based on Differential Evolution Algorithm

Research on Parameter Identification Method of Generator Exc...

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作者： Nan Li Yuqun Liu Bin Geng Key Laboratory of Modern Power System Simulation and Control and Renewable Energy Technology Ministry of Education Northeast Electric Power University College of Electrical Engineering Northeast Electric Power University Jilin Electric Power Co. Ltd.

In order to solve the problem of large parameter identification error caused by nonlinear links of excitation system being triggered easily when transient stability is under fault state, an improved differential evolution algorithm for system parameter identification is proposed by using the characteristic of artificial intelligence algorithm that the nonlinear link is approximated infinitely through optimization. The improvement of the algorithm solves the problems of slow convergence speed, poor fine optimization ability and easily to produce local optimum when classical artificial intelligence algorithm identifies the parameters of non-linear links. At the same time, in order to solve the problem of inaccurate parameters in the whole identification, a decomposition link identification strategy is proposed. The example analysis shows that the algorithm improves the convergence speed, avoids local optimum and improves the convergence accuracy. According to the proposed parameter identification strategy, the excitation system is decomposed and identified, which improves the accuracy of generator excitation system parameter identification, and provides an accurate model and method for power system stability analysis

关键词： Research on Parameter Identification Method of Generator Excitation system Based on Differential Evolution Algorithm

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Construction of an example system for AC/DC hybrid power grid with high-proportion renewable energy

Construction of an example system for AC/DC hybrid power gri...

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作者： Zhao, Dawei Ma, Jin Qian, Minhui Zhu, Lingzhi Yao, Liangzhong Ding, Kun Han, Hualing State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Changping District Beijing China State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems Jiangsu Engineering Technology Research Center for Energy Storage Conversion and Application China Electric Power Research Institute Gulou District Nanjing China Wind Power Technology Center of Gansu Electric Power Company Qilihe District Lanzhou China

Large-scale wind and solar power generations have got rapid development in recent years in China and abroad. They always connect to load centres through high-voltage direct current (HVDC) transmission or ultra HVDC (UHVDC) transmission lines. Such systems are so large and it is necessary to make appropriate equivalence according to the purpose of different research. At present, the analysis model of this kind of real system is few, and simplified single-machine infinite-bus system or IEEE example system is adopted most of the time, which may affect the accuracy of analysis results. Here, the UHVDC project from a practical renewable energy base to load centres in China is chosen as an example, the actual structure and parameters are used to establish a typical example system for AC/DC hybrid power grid with high-proportion renewable energy. The new-generation synchronous condenser with large capacity and the supporting synchronous generators are all considered. First, the installed power generation, power grid structure, and load configuration of example system are introduced. Then the load flow distribution and transient stability characteristics are analysed by using DIgSILENT powerFactory software. Finally, the feasibility of the proposed example system is shown by simulation results. © 2019 Institution of Engineering and *** right reserved.

关键词： Electric load flow

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