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Design of Rated Power Control Strategy of Wind Turbine Based on Particle Swarm Optimization

IOP Conference Series: Earth and Environmental Science 2018年第1期192卷

作者： YC Yang Y Liu P Song Y Cui Y Bai Department of Control and Computer Engineering North China Electric Power University Beijing 102206 China North China Electric Power Research Institute Co. Ltd. Smart Grid and New Energy Institute Beijing 100045 China Grid-connected Operation Technology for Wind-Solar-Storage Hybrid System State Grid Corporation Key Laboratory

In view of the reduction of wind turbine operating efficiency caused by wind speed measurement errors, this paper proposes a rated power control strategy for wind turbines for practical applications; in order to solve the problem that the pitch PI controller parameters of wind turbines are not easy to calculate and tune in the process of design and optimization, this paper proposes a complete set of methods for parameter tuning of pitch control PI controllers for wind turbines. This paper establishes a Bladed-Matlab co-simulation platform, uses Bladed software to build a complete model of a 2MW wind turbine, and designs a rated power control strategy for wind turbines. After the wind turbine model is linearized at different wind speed points by applying Bladed software, the linearized model for PI parameter tuning is obtained, and then the optimal PI parameters for each wind speed point are set by using particle swarm algorithm. According to the variation law between the PI parameters and the pitch angle obtained before, the PI parameters are adjusted adaptively by variable gain PI control. The simulation results show the superiority of the control strategy and parameter tuning method used in this paper.

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Method of Detection Optimization Based on Vector Electric Field Multi-electrode Gradient Information

Method of Detection Optimization Based on Vector Electric Fi...

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2017中国智能自动化会议(CIAC 2017)

作者： Jianjun Liu Chao Wu Guoyu Cui Zheng Wang Yubo Wang Guofeng Pan Guohua Liu Chengbo Hu Yongling Lu Xujie He State Grid Key Laboratory of Power Industrial Chip Design and Analysis Technology Beijing Smart-Chip Microelectronics Technology Co. Ltd Microelectronics Technology Institute Heibei University of Technology Jiangsu Electric Power Research Institute

1 Introduction In the operation of power system,substation operation and maintenance of the substation bear the operation and maintenance management,switching operation and accident handling and other important work,t... 详细信息

关键词： simulation Method of Detection Optimization Based on Vector Electric Field Multi-electrode Gradient Information Vector

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An engineering applicable dynamic equivalent method for large-scale AC system connected to VSC-HVdc

An engineering applicable dynamic equivalent method for larg...

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IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)

作者： Lin Zhu Xueguang Wu Dong Liu Global Energy Interconnection Research Institute Beijing China State Key Laboratory of Advanced Power Transmission Technology Beijing China Beijing Key Laboratory of DC grid Technology & Simulation Beijing China

ISBN: (纸本)9781509054190

To test the software and hardware functions of VSC-HVdc control and protection device, an efficient way is to carry out the hardware-in-loop (HIL) tests and setup a detailed AC/dc transient model in real-time digital simulator. However, taking into account capability of the simulator and details of the simulation, the large scale AC network outside the converters should be simplified and equivalent. In this paper, based on a principle that the short circuit levels should be consistent before and after equivalent, a new equivalent method to calculate the equivalent generator parameters for large scale AC power system is proposed. Firstly, rated capacity and access reactance of equivalent generators are calculated according to equivalent bus's short-current. Secondly, a new criterion is provided based on short-current contribution ratio, according to short-current and short-reactance of the equivalent bus. Finally, this criterion is used to choose dominate controller of the equivalent generators, and calculate controller parameters. At the same time, the Ward method is improved. The negative line resistance and generator active output are corrected. Finally, the proposed method is used for Xiamen equivalent grid which derived from a large scale of “Sanhua” China power grids and validated by comparison of the bus voltages, power flows, short-circuit levels and the dynamic response characteristics of the equivalent network, the validity of the proposed method is proved.

关键词： Generators Short-circuit currents Power system dynamics Power conversion Power grids

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Fast Fault Detection and Current Limiting Strategy of HVdc Circuit Breaker

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IOP Conference Series: Materials Science and Engineering 2018年第4期394卷

作者： Wei Li Xueguang Wu Dong Liu Bin Chang Le Zou School of Electronic Engineering North China Electric Power University Changping District Beijing 102206 China State Key Lab of Advanced Power Transmission Technology (Global Energy Interconnection Research Institute Co. Ltd.) Changping District Beijing 102209 China Beijing Key Laboratory of DC Grid Technology and Simulation (Global Energy Interconnection Research Institute Co. Ltd.) Changping District Beijing 102209 China Global Energy Interconnection Research Institute Co. Ltd. Changping District Beijing 102209 China

HVdc transmission has become the most valuable engineering technology because of its own advantages. But the rapid detection and isolation of dc side faults has been one of the major technical matters in the development of dc grids. Highvoltage dc circuit breaker is an important equipment to solve this problem, and becomes the current research hotspot. According to the process of HVdc breaker, this paper analyzes the fault detection and current limiting control of HVdc breakers, and proposes a fault detection method based on ROCOV (Rate Of Change Of Voltage) and a current limiting strategy of operation of arresters by sequence. It can reduce the operation time of the circuit breaker and the peak value of the fault current. Finally, simulation analysis is performed on the PSCAD/EMTdc to verify the correctness of the method.

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Research on microgrid protection based on transient polarity comparison

Research on microgrid protection based on transient polarity...

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China International Conference on Electricity Distribution, CICED

作者： Xiaowei Ma Bin Li Qingping Wang Zhiqian Bo Ming Zhang Xiaolin Ma XJ group State Grid Corporation of China Beijing China Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin China Economic and Technology Research Institute State Grid Shandong Electric Power Company Jinan China

ISBN: (纸本)9781467390712

Due to the characteristic of flexible operation mode of distributed power, the fault current between grid connected and islanding way is very different, conventional three-section over-current protection isn't suitable for microgrid power system. A big challenge is brought forward for microgrid protection, to satisfy quick acting and selective requirement. A microgrid protection principle based on transient polarity comparison is proposed in this paper, and it can adapt to the different operation mode. The one-dimensional discrete wavelet transform by Mallat algorithm is researched to extract the fault transient high frequency information, which is used as the basis of fault judgement. It can realize fault location by comparing the polarity of the transient high frequency signal. Furthermore, this realizing scheme of equipment is designed. Finally, the simulation work is carried out by Matlab to verify the correctness of the protection principle.

关键词： power generation protection discrete wavelet transforms distributed power generation fault currents fault location

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A risk assessment method for cascading failure caused by electric cyber-physical system (ECPS) 5

A risk assessment method for cascading failure caused by ele...

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5th IEEE International Conference on Electric Utility Deregulation, Restructuring and Power Technologies, DRPT 2015

作者： Zhao, Ting Wang, Dong Lu, Dongxu Zeng, Yuan Liu, Yanli Computing Technology and Applications Department State Grid Smart Grid Institute Beijing China Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin China

ISBN: (纸本)9781467371063

This paper presents a new risk assessment method for cascading failure caused by electric cyber-physical system (ECPS). The development of a trustworthy smart grid requires a deeper and more specific analysis of potential impacts resulting from failures of ECPS. A probability model is presented to calculate the reliability of ECPS which controls the security and stability control system. Cascading failure due to failures of ECPS is being investigated by risk assessment method in this paper. Two scenes including signal lost and signal transmission error which may lead to cascading failure in power system is considered. IEEE 118-bus system is used as a test system and the simulation results verifies the effectiveness of proposed failure model and risk assessment method. © 2015 IEEE.

关键词： Cyber Physical System

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A risk assessment method for cascading failure caused by electric cyber-physical system (ECPS)

A risk assessment method for cascading failure caused by ele...

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International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT)

作者： Ting Zhao Dong Wang Dongxu Lu Yuan Zeng Yanli Liu Computing Technology & Applications Department State Grid Smart Grid Institute Beijing China Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin China

关键词： Risk management Power system faults Power system protection Control systems Security Stability analysis Power industry

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dc-dc modular multilevel converter with high frequency transformer for transportation applications

DC-DC modular multilevel converter with high frequency trans...

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IEEE Conference and Expo Transportation Electrification Asia-Pacific (ITEC Asia-Pacific)

作者： Yuqing Cui Yu Chen Yingzhuo Chen Yong Kang Xiaoguang Wei Xinying Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology (AEET) Huazhong University of Science and Technology (HUST) Wuhan China State Grid Smart Grid Research Institute Beijing China

This paper proposes the design considerations of a high-voltage-high-power dc-dc modular multilevel converter (MMC), which is consist of the half-bridge submodules and an isolation transformer. To adapt the power density requirements of the transportation applications, a modulation method with low switching frequency for submodules but high-frequency ac voltage for transformer is proposed, aiming to reduce the size of the transformer, the inductors and the dc-capacitors of the submodules. The voltage fluctuation at the dc-capacitor in such a modulation is also estimated. Finally, a design example with 10kV to 20kV voltage and 1MW rating power is given. The analysis and simulation results are matched, which shows the validity of the analysis.

关键词： Modulation Reactive power Optimization Voltage control Capacitors Harmonic analysis Switching frequency

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High-fundamental-frequency modulation for the dc-dc modular multilevel converter (MMC) with low switching frequency and predicted-based voltage balance strategy

High-fundamental-frequency modulation for the DC-DC modular ...

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IEEE Conference and Expo Transportation Electrification Asia-Pacific (ITEC Asia-Pacific)

作者： Yu Chen Yuqing Cui Yupu Tao Yong Kang Xiaoguang Wei Xinying Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology (AEET) Huazhong University of Science and Technology (RUST) Wuhan China State Grid Smart Grid Research Institute Beijing China

This paper proposes the high-fundamental-frequency modulation of the dc-dc MMC-transformer-MMC topology, which is a potential candidate for the HVdc and transportation applications. With the proposed modulation, the MMC arms generate a high-fundamental-frequency ac voltage applying on the transformer, the size of the transformer, as well as the inductors and capacitors of the MMC arms, can be reduced. On the other hand, the proposed modulation ensures all the MMC submodules strictly working at the same fundamental frequency, and the switching losses of all the submodules are approximately balanced. Besides, the capacitor voltage balance strategy under the proposed modulation strategy is presented, and the current stresses of the submodules are also analyzed. Finally, the proposed modulation method is verified by a 10 kV/20 kV/1 MW simulation.

关键词： Modulation Capacitors Switches Switching frequency Stress Sorting Topology

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Tests on electromagnetic environment of ultra HVdc transmission lines in high altitude region

Tests on electromagnetic environment of ultra HVDC transmiss...

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Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC)

作者： Zhanqing Yu Rong Zeng Min Li Ruihai Li Lei Liu Bo Zhang Zheng Zhang Huaying Zhang State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing China Technology Research Center China Southern Power Grid Company Limited China

ISBN: (纸本)9781424456215

The Ultra High Voltage dc power transmission technique is developed quickly in China but used barely in the world. Corona phenomenon in high altitude region is more serious, and corresponding electromagnetic environment is more severe as well. A UHVdc test lines are completed for tests in Kunming, China, with an altitude of 2100 m. An automotive electromagnetic environment testing system was installed under the line. Measurement of electromagnetic environment was carried out. Radio interference, audible noise, resultant electric field and ion current density at ground level were measured at different voltage from ±800kV to ±1000kV, and atmosphere conditions including sunny, rainy and cloudy weather. The measured result show some difference with those acquired at sea level and is significant for further studies of corona mechanism under high altitude condition. Measured results were compared with the calculated results.

关键词： HVdc transmission Atmospheric measurements Sea measurements Electromagnetic measurements Voltage Corona Power transmission Automotive engineering System testing Electromagnetic interference

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