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Research on Signal Extraction and control Strategy of Single-Phase PWM Rectifier in d-q Coordinate Frame

Research on Signal Extraction and Control Strategy of Single...

引用

International Conference on Wireless power Transfer, ICWPT 2022

作者： Gong, Lieqian Fu, Guanggang Wang, Xin Tang, Mengyang Liao, Wu Miao, Yiru State Grid Wenzhou Power Supply Company Limited Wenzhou325000 China College of Electrical and Information Engineering Hunan University Changsha410082 China Key Laboratory of Smart Grid and Intelligent Control in Nanchong Southwest Petroleum University Nanchong637001 China Chengdu Guojia Electriacal Engineering Co. Ltd. Chengdu611756 China

ISBN: (纸本)9789819906307

There are some AC time-varying physical quantities in single-phase PWM rectifier, as a result, it is difficult to design control system. a current inner loop-voltage outer loop control strategy is implemented by establishing the math model in d-q synchronous frame. The grid voltage contains abundant harmonics, which seriously affects the detection accuracy of the voltage phase, and the virtual component of grid-side current cannot be directly sampled, so a discrete extraction method for the fundamental component of the grid voltage without phase-locked loop is proposed. Simulation and experimental results show that under different loads, the output voltage of the rectifier can accurately follow the given, and the dynamic performance is good. The grid-side current and electromotive force maintain unit power factor operation, which proves the virtual current detection method and control strategy proposed in this paper is feasibility and correctness. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Extraction

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power System Small-signal Stability Assessment Model Based on Residual Graph Convolutional Networks 5

Power System Small-signal Stability Assessment Model Based o...

引用

2021 5th International Conference on Electrical, Automation and Mechanical Engineering, EAME 2021

作者： Su, Yinsheng Guo, Mengxuan Yao, Haicheng Guan, Lin Huang, Jiyu Zhu, Siting Zhong, Zhi Department of Power System Operation China Southern Power Grid Guangzhou China School of Electric Power South China University of Technology Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China

Small-signal stability (SSA) is important to power system security. A data-driven approach is established for rapid prediction of the power system oscillation characteristics. The key of the approach is the Graph Convolution Networks (GCN) with residual mechanism, which works to aggregate features from high-dimension steady-state operation information and is denoted as ResGCN (RESidual GCN) in the paper. The residual mechanism helps to overcome the network degradation phenomenon. Both the oscillation frequency and damping ratio of multiple modes can be predicted by the proposed model. The performance of the proposed scheme as well as its adaptability to the power system topological changes is verified on the IEEE 39 Bus system. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Convolution

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Adaptability Study on Out-of-Step Separation Devices of Complex Multiinfeed AC/ DC power Systems

Adaptability Study on Out-of-Step Separation Devices of Comp...

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2021 International Conference on power System Technology, powerCON 2021

作者： Chen, Yong Chang, Dongxu Zhu, Yihua Zhu, Yukun Guo, Hengdao Li, Shengnan Electric Power Research Institute Ltd. of Yunnan Power Grid Co. KunMing China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China China Southern Power Grid State Key Laboratory of HVDC Electric Power Research Institute Guangzhou China

ISBN: (纸本)9781665407373

The power flow distribution of the GuangxiGuangdong AC transmission section (GX-GD section) has changed greatly as Kunliulong and Lugaozhao three-terminal HVDC projects have been put into operation, and it is necessary to study on the adaptability of out-of-step separation devices. Based on the real primary system, an equivalent system model is proposed in this paper which can accurately locate the oscillation center and calculate the minimum voltage at the measuring point. Dynamic real-time simulation is carried out for various types and different principles of out-of-step separation devices. Typical problems such as unreliable out-of-step locking criterion in the fault process and device refusing to move when the oscillation center is located at the device installation point are found and solved At the same time, based on the power grid panoramic simulation test technology and the actual configuration of out-of-step separation devices, the problems in the coordination of out-of-step devices near the GX-GD section are comprehensively studied, and the suggestions of putting the wide area out-of-step separation system into operation as soon as possible are put forward. The improvement and optimization measures proposed in this paper have been applied in the real system. © 2021 IEEE.

关键词： Electric load flow

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Distance protection Setting Scheme for the Loss of Main protection in High-Voltage power grid

Distance Protection Setting Scheme for the Loss of Main Prot...

引用

International Conference on power System Technology (powerCON)

作者： Yongjie Zhang Wei Cong Yi Tang Yudun Li Congcong Li Anning Wang Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Jinan China State Grid Shandong Electric Power Company Jinan China State Grid Shandong Electric Power Research Institute Jinan China

With the continuous construction and development of high-voltage power grids, strategies such as dual redundancy configuration of main protection have been proposed successively to ensure reliable operation of the protection. However, certain abnormal conditions, such as loss of communication power supply, failure of both main protection channels, total station DC power loss (due to fire, etc.), theoretically cannot be completely ruled out in terms of their potential occurrence. According to the power system operation regulations, when the main protection is lost, it is necessary to trip the line, which affects the normal operation of the power grid and disrupts production and daily life. Therefore, a distance protection setting scheme for the loss of main protection in high-voltage power grids has been proposed. When abnormal operating conditions occur, the proposed scheme defines the emergency protection boundary and identifies the protective devices that require protection value modifications. Following the proposed principles, necessary adjustments will be made to the setting values of these protective devices. Using PSCAD/EMTDC to construct a simulation model, the simulation results demonstrate that the proposed distance protection setting scheme in this paper does not require additional protective devices and effectively ensures the safe operation of the power grid under abnormal operating conditions.

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Research on protection Method of Medium Voltage DC Distribution Network 5

Research on Protection Method of Medium Voltage DC Distribut...

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5th IEEE Conference on Energy Internet and Energy System Integration, EI2 2021

作者： Li, Shengwen Wang, Jinhao Chen, Xiaoqian Qin, Wenping Liu, Yizhao Wang, Zhongjie Yang, Yang Ren, Yong Power Grid Technology Center Electric Power Research Institute of State Grid Shanxi Electric Power Company Taiyuan China Shanxi Key Laboratory of Power System Operation and Control Taiyuan University of Technology Taiyuan China

ISBN: (纸本)9781665434256

DC line protection is a key issue in the development of DC distribution networks. The biggest challenge is to identify fault sections quickly and reliably. In order to ensure the reliable operation of the DC grid, this paper takes a typical four-port ring medium voltage distribution network as an example to propose a DC protection network fault protection strategy based on DC inductors. Since the parameters involved in this criterion are all implemented by local measurements, it has the characteristics of real-time communication independent of off-site signals. The MMC-based four-port DC distribution network was modelled using a real-time digital simulator (RTDS), and a number of simulation experiments were performed to verify the effectiveness of the proposed protection scheme. The simulation results show that the proposed protection method not only can detect faults quickly and accurately, but also has a certain effect on detecting high-impedance faults. © 2021 IEEE

关键词： Fault detection

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Optimization of Robot End-Effector Load Gravity Compensation for Unmanned Live Work in Electric power Distribution Networks Based on Improved PSO Algorithm

Optimization of Robot End-Effector Load Gravity Compensation...

引用

2023 China Automation Congress, CAC 2023

作者： Chen, Jinge Chen, Xin Hu, Chenyu Huang, Guangxian Sun, Shu Jian, Xu School of Automation China University of Geosciences Wuhan430074 China Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems Wuhan430074 China Ministry of Education Engineering-Research Center of Intelligent Technology for Geo-Exploration Wuhan430074 China State Grid Hubei Electric Power Co. Ltd. Xianning Power Supply Company Distribution Department Xianning437000 China State Grid Hubei Electric Power Co. Ltd. Electric Power Science Research Institute Equipment Technology Center Wuhan430077 China

ISBN: (纸本)9798350303759

In the field of electric power distribution network operation, most tasks involve contact operations. A key technology to enable the flexible operation of robots in live distribution network tasks is the installation of six-dimensional force sensors on the robot's end flange. These sensors allow the robot to perceive external environmental contact forces. However, the presence of the end load interferes with the accurate perception of external forces. Aiming at the gravity compensation of robot end load, an optimization algorithm of gravity compensation based on particle swarm optimization is proposed. In this method, the optimal solution model is established with the objective of minimum sum of squared errors, and the particle swarm optimization algorithm is used to estimate the mounting declination angle of the force sensor and improve the precision of gravity compensation. The experiments show that the proposed method can effectively reduce the maximum gravity compensation error and the average gravity compensation error in each direction after optimization, in which the maximum gravity compensation error of the resultant force is reduced by 9.11% and the average gravity compensation error of the resultant force is reduced by 12.34%. © 2023 IEEE.

关键词： Error compensation

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Developing Characteristics of Oil-immersed Transformer Internal Fault with Dignostic Method Using Convergence Patterns of Free Gas 2

Developing Characteristics of Oil-immersed Transformer Inter...

引用

2nd IEEE China International Youth Conference on Electrical Engineering, CIYCEE 2021

作者： Zhang, Yucheng Hao, Zhiguo Zheng, Yuping Pan, Shuyan Li, Boyu Xue, Zhongxin Deng, Jinzhao Xi'An Jiaotong University School of Electrical Engineering Xi'an712000 China State Key Laboratory of Smart Grid Protection and Operation Control Nanjing210000 China

ISBN: (纸本)9781665400640

Light gas protection only operates when gas within the transformer collection chamber reaches threshold volume. Such criterion failed to reflect transformer conditions accurately due to the lack of understanding for defect developing process and corresponding gas generation- convergence pattern, which has led to lower protection reliability and has caused several transformer explosions. To address current problem, an experimental tank with structure resembling that of a power transformer is set up, inside which the needle-plate oil-pressboard breakdown model is planted. Experimental results indicate that throughout fault development, voltage drops became more frequent until arcing occurs, so is HFCT signal;meanwhile gas generation rate increases through slight partial discharge, spark discharge and arcing stage, the collected gas volume corresponds with patterns above. The purpose of this study is to clarify the defect developing process and the gas generation-convergence pattern for oil-immersed transformer internal fault in guidance for a more reliable protection method. © 2021 IEEE.

关键词： Partial discharges

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Analysis on Participation Strategy of Independent Energy Storage Station in Electricity Spot Market

Analysis on Participation Strategy of Independent Energy Sto...

引用

power and Electrical Engineering (ACPEE), 5th Asia Conference on

作者： Daning You Guoqiang Zhang Shihang Song Hanghang Liu Yanbin Cai Yuanyuan Wang Li Zhang Power Dispatching Control Center State Grid Shandong Electric Power Company Jinan China Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Jinan China Dongying Power Supply Company State Grid Shandong Electric Power Company Dongying China

To implement the carbon peaking and carbon neutrality goals, improving market mechanism to maximize the utilization of energy storage is attracting more and more attention. This paper addresses the trading strategy of independent energy storage station participating in both energy market and frequency regulation market. A restrictive coefficient of available capacity of energy storage participating in frequency regulation market is introduced, which characterizes the constraints of the energy storage between the two markets. Consequently, the market optimization model with the restrictive coefficient is constructed. Then, different strategies are set based on the capacity allocation of energy storage in the two markets, and the energy storage station’s role and revenue are analyzed. Simulations under different participation strategies are done, the results show that with the increase of renewable energy connected to the grid, taking the energy storage more as an excellent frequency regulation resource is beneficial to renewable energy consumption and system operation.

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Optimization and Scheduling of Wind-Photovoltaic-Integrated Energy System Based on ISSA

Optimization and Scheduling of Wind-Photovoltaic-Integrated ...

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Clean Energy Storage and power Engineering (CESPE), International Conference on

作者： Shunyu Wu Xiangyu Kong Shuai Luo Yang Wang Yi Gao Tianchun Xiang Tianjin Key Laboratory of New Energy Power Conversion Transmission and Intelligent Control Tianjin University of Technology Tianjin China Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin China Economic and Technical Research Institute of State Grid Tianjin Electric Power Company Tianjin China China State Grid Tianjin Electric Power Company Tianjin China

ISBN: (数字)9798331511708

ISBN: (纸本)9798331511715

A multi-objective scheduling model of the park integrated energy system (PIES) with an improved Sparrow Search Algorithm (ISSA) is proposed for the problem of economy, stability, and environmental protection of PIES containing photovoltaic cells, wind turbines, and batteries. PIES includes three kinds of electricity, heat, and gas loads, as well as coal-fired units, gas units, wind, and photovoltaic power generation units. Aiming at the economic dispatching problem of PIES by dispatching model of PIES of the park is carried out. Economic cost and utilization rate of clean energy are taken as objective functions. The ISSA algorithm is used to solve the multi-objective function, and the example analysis shows that the proposed model is conducive to reducing the total cost of system operation. The result of the example verifies the feasibility, superiority, and applicability of ISSA in solving the multi-objective optimal scheduling store.

关键词： Green energy Costs Spirals Systems operation Optimal scheduling Wind power generation Dispatching Stability analysis Wind turbines Load modeling

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Analysis of the Impact of Urban and Electric power Big Data Economy on Pollution Reduction and Carbon Reduction Based on Benchmark Regression Model

Analysis of the Impact of Urban and Electric Power Big Data ...

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Clean Energy Storage and power Engineering (CESPE), International Conference on

作者： Zixuan Qi Xiangyu Kong Yang Wang Yi Gao Shuai Luo Tianchun Xiang Tianjin Key Laboratory of New Energy Power Conversion Transmission and Intelligent Control Tianjin University of Technology Tianjin China Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin China China State Grid Tianjin Electric Power Company Tianjin China Economic and Technical Research Institute of State Grid Tianjin Electric Power Company Tianjin China

ISBN: (数字)9798331511708

ISBN: (纸本)9798331511715

Currently, in promoting ecological civilization construction in China, the coordinated governance of pollution and carbon reduction is regarded as the core strategy and implementation focus. As a new economic transformation and upgrading model, the Electric power big data economy is becoming essential in promoting this process. The entropy method is used to construct evaluation indicators for the Electric power big data economy, pollution reduction, and carbon reduction. Subsequently, a benchmark regression model was built for testing based on carefully considering other variables that may affect pollution reduction and carbon reduction through benchmark regression analysis. Finally, exploring the diversity and specificity of the impact of the Electric power big data economy on pollution reduction and carbon reduction from different dimensions - regional economic differences, Electric power size classification, and specific backgrounds of each city's development stage aims to provide targeted strategic recommendations for policymakers, ensuring the coordinated promotion of the healthy development of Electric power big data economy and environmental protection goals.

关键词： Economics Analytical models Pollution Biological system modeling Urban areas Carbon dioxide Big Data Benchmark testing Data models power systems

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