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检索条件"机构=Key Laboratory of Control and Simulation of Power Systems and Generation Equipment"

共 547 条记录，以下是221-230 订阅

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Consensus-Based Distributed Economic Dispatch with Optimized Transition Matrix

Consensus-Based Distributed Economic Dispatch with Optimized...

引用

IEEE power and Energy Society General Meeting

作者： Xinfei Yan Haiwang Zhong Jianxiao Wang Zhenfei Tan State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Beijing China

With an increasing penetration of distributed energy resources (DERs) in Energy Internet, there is a surge of interest in distributed economic dispatch (DED) problems. The existing literature mainly focuses on average consensus algorithms, the convergence of which remains a bottleneck in practical applications. To improve the convergence rate of DED, this paper proposes a consensus algorithm based on optimized transition matrix (TM) of Markov chain. A DED model is firstly developed under a consensus-based information exchange architecture, in which a generator only communicates with its neighbors. Thus DED is implemented in an iterative manner with generators exchanging information according to a predefined TM. In contrast to the aver-agely weighted TM, we minimize the Frobenius norm (F-norm) of the TM in order to limit the eigenvalues that greatly influence the convergence rate of DED. Additionally, a virtual power method is introduced to meet generators' power limits by reformulating the power allocation ratio. Case studies verify the effectiveness and efficiency of the proposed algorithm.

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Commutation Failure Mitigation Method Based on Improved Commutation Area in HVDC system

Commutation Failure Mitigation Method Based on Improved Comm...

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International Conference on Advanced power System Automation and Protection (APAP)

作者： Haozong Wang Xinzhou Dong State Key Lab of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Beijing China

ISBN: (数字)9781728117225

ISBN: (纸本)9781728117232

Commutation failure (CF) is one of the major concerns in high-voltage direct current (HVDC) transmission system. Of many methods to mitigate CF, advancing firing angle is preferred one since it can be easily implemented in current HVDC controllers without extra hardware modification. However, methods in previous works either lack for quantitative analysis or based on much strong hypothesis. In this paper, we propose a novel CF mitigation method based on improved commutation area. The salient feature of proposed strategy is that DC current is not considered as a constant under fault conditions. simulations on PSCAD/EMTDC software demonstrate the good performance of proposed method.

关键词： HVDC transmission Circuit faults Mathematical model Firing Valves Inverters Resistance

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A Novel Digital Active Gate Driver For High-power IGBT To Reduce Switching Losses And Stresses

A Novel Digital Active Gate Driver For High-Power IGBT To Re...

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IEEE Energy Conversion Congress and Exposition

作者： Yatao Ling Zhengming Zhao Yicheng Zhu State key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China

This paper proposes a novel digital active gate drive method, aiming to optimize high-power IGBT's switching losses and stresses. Compared to common voltage-source gate driver, the proposed method can reduce switching losses while being able to suppress IGBT current and voltage overshoots during switching transients. The proposed method is described in detail and is experimentally verified under various operating points. Additionally, since parasitic inductances in the commutation and gate loop are critical to gate driver's stability analysis and online calculations of collector current and current slope, an extraction principle is proposed and verified by experiments.

关键词： Insulated gate bipolar transistors Logic gates Switches Field programmable gate arrays Delays Switching loss

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An Adaptive Restart Method for DC Transmission Line in LCC-HVDC System

An Adaptive Restart Method for DC Transmission Line in LCC-H...

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International Conference on Advanced power System Automation and Protection (APAP)

作者： Jing CAI Xinzhou DONG State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China

ISBN: (数字)9781728117225

ISBN: (纸本)9781728117232

DC-line fault recovery sequence (DFRS) is widely implemented in LCC-HVDC system to realize fast recovery in case of temporary fault. When permanent fault occurs, restart still happens several times as preset, resulting in repeated impacts and reducing the stability and reliability of the system. An adaptive restart for DC line fault is studied in this paper to deal with this problem. Firstly, the converter valves states and DC voltage characteristics under temporary fault and permanent fault are analyzed respectively. Then, a method based on DC voltage control is proposed to distinguish different fault states. Current DFRS strategy is improved by adding this process, through which the fault pole will only restart after the temporary fault disappearing, while directly blocked when a permanent fault is recognized. Fault handling time can be shortened and negative effects of DC line fault are minimized. The simulation results verify feasibility and effectiveness of proposed method.

关键词： Firing HVDC transmission Inverters Voltage control Valves Rectifiers Thyristors

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Discrete State Event-Driven Approach for High-power Converter simulations

Discrete State Event-Driven Approach for High-Power Converte...

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IEEE Energy Conversion Congress and Exposition

作者： Bochen Shi Zhengming Zhao Yicheng Zhu Zhujun Yu Jiahe Ju Liqiang Yuan Kainan Chen State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China

Demands for high-power converters are increasing rapidly. Nevertheless, due to their complex structures and multi-time-scale features, accurate and efficient simulation of such systems has long been a huge obstacle. Aiming at improving the unacceptably slow simulation speed of high-power converters, this paper improves Discrete State Event-Driven (DSED) approach by implementing a decoupling method. Taking a 10kV 1MW electric energy router as an example, this paper evaluates the effectiveness of DSED with the proposed decoupling method in high-power applications. In the studied case, compared with commercially available tool for power electronics simulation, PLECS, DSED can achieve an up to 1000-fold improvement in simulation speed under the same accuracy: PLECS takes 6 hours while DSED only takes 18 seconds. DSED provides a powerful simulation tool for analysis, design and control of high-power converters.

关键词： event-driven simulation numerical algorithm circuit partitioning high-power converter electric energy router solid-state transformer

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An Explicit MPC Based on Galerkin Method for AGC Considering Volatile generations

An Explicit MPC Based on Galerkin Method for AGC Considering...

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IEEE power and Energy Society General Meeting

作者： Yiwei Qiu Jin Lin Feng Liu Yonghua Song State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Beijing China The University of Macau Macau China

Imbalance of generation and load caused by volatile generations poses challenges on frequency regulation. AGC is required to respond to the generation fluctuations without violating operational and security constraints. While explicit model predictive control (EMPC) provides an approach, the partition number of the piecewise affine control laws grows exponentially with the number of constraints and prediction/control horizons, which hinders its application in large systems. In this paper, we propose an EMPC approach for AGC by approximating the control laws using Legendre polynomial series expansions, thus entirely eliminating the partition issue. Galerkin method is applied to the KKT conditions of EMPC's multiparametric quadratic programming (mp-QP) problem to compute the approximations. Case study in New England 39-bus system verifies the performance and efficiency of the proposed controller.

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A Voltage-fed control Method with Automatic Bidirectional power Switching Capability for CLLC and SR Buck Based Two Stage Converters

A Voltage-fed Control Method with Automatic Bidirectional Po...

引用

International Conference on power Electronics and Motion control (IPEMC)

作者： Huan Chen Hongsheng Chong Kai Sun You Zhou Hang Zhou John Fletcher State Key Lab of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Beijing China Nation Institute of Clean and Low Carbon Energy Beijing China School of Electrical Engineering and Telecommunications University of New South Wales Sydney Australia

ISBN: (数字)9781728153018

ISBN: (纸本)9781728153025

The CLLC converter is widely used in bidirectional power conversion systems. The conventional control method for CLLC converter is pulse frequency modulation (PFM) method. However, PFM method can not realize smooth bidirectional power switching, because the driver signals for the primary and the secondary side switches are asymmetric. This paper proposed a voltage-fed control method for CLLC and Synchronous Rectified (SR) Buck two stage converters, which can realize the automatic and smooth bidirectional power switching for CLLC stage. In the proposed control method, the PWM signals for both the primary and the secondary switches are the same. The effectiveness of the proposed voltage-fed control method is verified by experiments.

关键词： Prototypes Switches Pulse width modulation control systems Automatic voltage control power electronics Transient analysis

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Development and test research of 10kv DC circuit breaker based on the principle of coupled negative voltage

Development and test research of 10kv DC circuit breaker bas...

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The 16th IET International Conference on AC and DC power Transmission (ACDC 2020)

作者： W. Li B. Liu F. Xiao H. Wang Y. Wang W. Xie Z. Yu Shandong Taikai High-Voltage Switchgear Co. Ltd. Tai’an China China Electric Power Research Institute Beijing China Tsinghua University State Key Laboratory of Control and Simulation of Power System and Generation Equipment (Department of Electrical Engineering Beijing China

With the increase of multi-terminal flexible DC distribution network projects, medium-voltage DC circuit breaker, as the key equipment to remove DC short-circuit fault, plays a key role in the operation reliability of the whole DC distribution network. In order to meet the engineering needs of DC distribution network, a 10kV hybrid DC circuit breaker based on the coupling negative voltage principle is developed in this paper. Firstly, the topology and working principle of the DC circuit breaker are introduced. Furthermore, the design scheme of key components including fast mechanical switch, power electronic switch and coupling negative voltage device is given. Finally, a 10kV hybrid DC circuit breaker prototype is developed and tested. The results show that the 10kV hybrid DC circuit breaker can break 15kA short circuit current within 2ms, and has the characteristics of low loss and high reliability.

关键词： circuit breakers short-circuit currents DC distribution systems power distribution faults power distribution reliability

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power Output Monitoring and Anomaly Identification of Photovoltaic systems Using Graphical Modeling

Power Output Monitoring and Anomaly Identification of Photov...

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International Conference on Sensing, Diagnostics, Prognostics, and control (SDPC)

作者： Yonghua Chen Xiaochen Zhang Gang Liu Rui Wu Chao Liu Dongxiang Jiang NARI Technology Co. Ltd. NARI Group Corporation (State Grid Electric Power Research Institute) Nanjing China Tsinghua University Beijing China State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China

ISBN: (数字)9781728170503

ISBN: (纸本)9781728170510

Photovoltaic cells are being increasingly installed worldwide as a type of important renewable resource for power generation. Among the installed photovoltaic systems, data are collected from the control and monitoring system, and the anomaly detection researches are mostly based on the individual photovoltaic cells and the systematic behavior in a group of photovoltaic systems is not well studied. Based on the assumption that the photovoltaic cells installed in the same location are with very close solar radiation, the power output of each subsystem is considered in this work for monitoring the operating status of the subsystem and identifying the anomalous subsystem, where spatiotemporal pattern network, a probabilistic graphical modeling approach, is applied. The results show that the presented framework is able to detect the anomaly and locate the anomalous subsystem.

关键词： Photovoltaic systems Fault diagnosis Photovoltaic cells Data models Spatiotemporal phenomena Monitoring Anomaly detection

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Review on Pumped Storage power Station in High Proportion Renewable Energy power System

Review on Pumped Storage Power Station in High Proportion Re...

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IEEE Student Conference on Electric Machines and systems

作者： Bingxin Sun Shuping Tian Jiang He Liande Liu Zhiqiang Wang Jiawei Guo Fei Xu Te Cheng Junhui Li Inner Mongolia Hohhot Pumped-Storage Power Generation Co LTD Hohhot China State Key Lab of Power Systems Tsinghua University Beijing China Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education (Northeast Electric Powe University) Jilin China

ISBN: (数字)9781728156224

ISBN: (纸本)9781728156231

Large scale renewable energy, represented by wind power and photovoltaic power, has brought many problems for the safe and stable operation of power system. Firstly, this paper analyzes the main problems brought by large-scale wind power and photovoltaic power integration into the power system. Secondly, the paper introduces the basic principle and engineering construction of pumped storage power station. Thirdly, the paper expounds in detail the current application of pumped storage power station in power system, and finally points out the main problems faced by the development of Pumped Storage power Station and the development trend, so as to provide reference for the construction and operation of pumped storage power station.

关键词： Photovoltaic systems Renewable energy sources Conferences Pumps Wind power generation Market research power systems

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