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8th IEEE International Conference on Advanced power System Automation and Protection, APAP 2019

作者： Cui, Xin Wang, Bin Dong, Xinzhou Liu, Kun Tsinghua University Key Lab of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Beijing China Key Lab for Power System Protective Relaying Real Time Digital Simulation of Guangdong Power Grid Dispatching and Controlling Center of Guangdong Power Grid Guangzhou China

ISBN: (纸本)9781728117225

The problem of high resistance grounding fault detection in resonant grounding system is always the pain point and difficulty in the field of power system research. To solve the problem, based on PSCAD software, this paper firstly establishes a typical distribution system model, and analyzes the relationship between the transient component, traveling wave component and the fault initial angle, transition resistance value and arc. Secondly, this paper analyzes the effect of the main fault detection methods such as transient methods and travelling wave method, and gives the effective domain of different detection methods. Above analysis establishes a complete systematic test scheme for the high resistance grounding fault detection, and provides an effective test support for the subsequent effectual fault detection method for high resistance grounding fault. © 2019 IEEE.

关键词： Fault detection

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The research of synchronized phasor measurement units in smart substations

The research of synchronized phasor measurement units in sma...

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2011 International Conference on Advanced power System Automation and Protection, APAP 2011

作者： Xu, Yong Zhang, Dao-Nong Yu, Yuehai Status Key Lab. of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China China Electric Power Research Institute Haidian District Beijing 100085 China North China Power Engineering Co. Ltd. Beijing 100120 China State Grid Electric Power Research Institute Nanjing 210061 China

ISBN: (纸本)9781424496198

Smart substation is the base of smart grid and it is made up of a lot of IEDs (intelligent electric device). Synchronized phasor measurement unit (PMU) plays a very important role in the smart grid, and a great deal of PMUs have been installed in China. The requirement of PMU in the smart substation is different from traditional substation. This paper introduces that the PMU is suitable for smart substation, there are several details that need to be complemented in IEC 61850 standards, and the paper gives some suggestion to improve it. © 2011 IEEE.

关键词： Phasor measurement units

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Ultra-short-term solar power forecasting based on a modified clear sky model

Ultra-short-term solar power forecasting based on a modified...

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第三十九届中国控制会议

作者： Yuan Ma Xuemin Zhang Shengwei Mei Zhao Zhen Rui Gao Zijie Zhou State Key Lab of Control and Simulation of Power Systems and Generation Equipments （Dept of Electrical Engineering Tsinghua University）

The ultra-short-term prediction of photovoltaic power system is of great significance to the safe operation of power ***,the daily and annual periodicity of solar radiation brings strong non-stationary to the photovoltaic power series,which makes it difficult to predict the photovoltaic power *** order to overcome the problem that the detailed clear sky model relies on a large number of plant parameters,this paper proposes a prediction algorithm based on a modified clear sky ***,historical data and geographical location of a certain site are utilized to build a modified clear sky model,then the theoretical clear sky power curve fitted by the modified clear sky model are divided by the actual historical power output to get a stabilized time series,finally the method of "online update" is adopted to forecast PV plant power output in the ultrashort-term time horizon（0-4 h）.The test results of a photovoltaic power station in Ningxia show that the proposed model can reduce the prediction error of the 4 th hour to about 3%.

关键词： Clear sky model stabilization photovoltaic power generation ultra-short-term prediction

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Study on High Impedance Grounding Fault Protection for Personal Safety Guard in Distribution Grid 8

Study on High Impedance Grounding Fault Protection for Perso...

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8th IEEE International Conference on Advanced power System Automation and Protection, APAP 2019

作者： Liu, Kun Cui, Xin Wang, Bin Dong, Xinzhou Key Lab for Power System Protective Relaying Real Time Digital Simulation of Guangdong Power Grid Dispatching and Controlling Center of Guangdong Power Grid Guangzhou China Tsinghua University Key Lab of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Beijing China

ISBN: (纸本)9781728117225

In recent years, human electric shock accident caused by line fault of distribution system has happened all over the world. This kind of problem of high resistance grounding fault safety is becoming more and more the attention of the researchers. In this paper, typical arc high resistance grounding fault model is established to simulate the human electric shock accident and the line fell to the ground condition. The transient- state and steady-state fault characteristics of high resistance grounding fault are analyzed in the neutral point grounded through a small resistance grounding system and the resonant grounding system. The above analysis has laid a good foundation for the establishment of an effective fault detection method for high resistance grounding and the realization of human electric shock protection. © 2019 IEEE.

关键词： Fault detection

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A corrective security-constrained optimal power flow method for AC/DC hybrid systems based on MMC-HVDC

A corrective security-constrained optimal power flow method ...

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2017 IEEE Conference on Energy Internet and Energy System Integration, EI2 2017

作者： Lin, Yi Tang, Yu-Chen Qiu, Liu-Qing Zhang, Ming-Ye Ju, Yu-Tao State Grid Fujian Power Economic Research Institute Fuzhou China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Tsinghua University Beijing China College of Information and Electrical Engineering China Agricultural University Beijing China

ISBN: (纸本)9781538614273

This paper presents an optimal power flow (OPF) model for AC/DC meshed networks with Modular Multilevel Converter based High Voltage Direct Current (MMC-HVDC) system. The OPF problem is formulated to minimize the total network loss of the whole AC/DC grids by adjusting generators and modular multilevel converters considering N-1 constraints and post-contingency corrective control. A practical method is proposed to handle N-1 static security constraints and corrective control with OPF more effectively. simulations are conducted on IEEE 39-bus testing system and a practical power grid. The results demonstrate the effectiveness of the approach. © 2017 IEEE.

关键词： Electric load flow

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Implications of COVID-19 for the Electricity Industry: A Comprehensive Review

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CSEE Journal of power and Energy systems 2020年第3期6卷 489-495页

作者： Haiwang Zhong Zhenfei Tan Yiliu He Le Xie Chongqing Kang Department of Electrical Engineering the State Key Lab of Control and Simulation of Power Systems and Generation EquipmentInstitute for National Governance and Global GovernanceTsinghua UniversityBeijing 100084China Department of Electrical and Computer Engineering Texas A&M UniversityCollege StationTX 77843 USA

As COVID-19 sweeps through the whole world,human activities have been changed *** such circumstances,the electricity sector is deeply affected and faced with great *** paper provides a comprehensive review of the impacts that the pandemic has caused on the electricity *** demand has dropped sharply as governments around the world executed lockdown restrictions,while the load composition and daily load profile have also *** share of renewable generation has increased against the decline of the total electricity *** power balance situation and increased uncertainty of demand have posed higher pressure on system operators,along with voltage violation issue and challenges for system maintenance and *** electricity market is also substantially influenced,while longterm investment in clean energy is expected to be *** externality such as emission reduction is also discussed.

关键词： COVID-19 electricity industry energy market pandemic power system

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Repeated Strike Process During Disconnector Operation in Ultra-High Voltage Gas-Insulated Switchgear

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Plasma Science and Technology 2016年第3期18卷 247-253页

作者：关永刚蔡元纪陈维江刘卫东李志兵岳功昌张俊民 State Key Lab of Control and Simulation of Power System and Generation Equipments Department of Electrical EngineeringTsinghua UniversityBeijing 100084China State Grid Corporation of China Beijing 100031China China Electric Power Research Institute Beijing 100192China School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China

Very fast transient over-voltage （VFTO）, induced by disconnector operations in gas- insulated switchgears, has become the limiting dielectric stress at ultra-high voltage levels. Much work has been done to investigate single-strike waveforms of VFTO. However, little study has been carried out investigating the repeated strike process, which would influence VFTO significantly. In this paper, we carried out 450 effective experiments in an ultra-high voltage test circuit, and conducted calculations through the Monte Carlo simulation method, to investigate the repeated strike process. Firstly, the mechanism of the repeated strike process is proposed, based on the ex- perimentai results. Afterwards, statistical breakdown characteristics of disconnectors are obtained and analyzed. Finally, simulations of the repeated strike process are conducted, which indicate that the dielectric strength recovery speed and polarity effect factor have a joint effect on VFTO. This study enhances the understanding of the nature of VFTO, and may help to optimize the disconnector designed to minimize VFTO.

关键词： disconnector （DS） repeated strike process discharge statistical breakdowncharacteristics ultra-high voltage （UHV） very fast transient over-voltage （VFTO）

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Virtual flux based direct power control for three-level PWM rectifier 17

Virtual flux based direct power control for three-level PWM ...

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2014 17th International Conference on Electrical Machines and systems, ICEMS 2014

作者： Yingchao, Zhang Liping, Jin Yongchang, Zhang Ting, Lu Zhengming, Zhao Key Lab. of Special Power Supply of PLA Chongqing Communication Institute China North China University of Technology Power Electronics and Motor Drive Engineering Research Center China State Key Lab. of Control and Simulation of Power System and Generation Equipments Tsinghua University China

ISBN: (纸本)9781479951611

This paper presents a new control strategy for three-level neutral point clamped (NPC) pulse width modulated (PWM) rectifier without power source voltage sensors. The relationship between instantaneous power and voltage vectors is derived mathematically. Virtual flux is estimated and used to calculate the phase of the power source voltage and instantaneous power. On these bases, a direct power control (DPC) scheme for three-level PWM rectifier is presented. An optimal switching table is established, vector switching scheme and balance strategy for the neutral point potential are discussed. Variable switching frequency and dynamic process of the startup are also analyzed. Experimental results have verified the theoretical approach and the three-level PWM rectifier with proposed DPC based on virtual flux exhibits several advantages, such as simple algorithm, low costs and excellent dynamic performance. © 2014 IEEE.

关键词： Electric rectifiers

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A schedule power flow auto generating technology in day-ahead security validation

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Dianli Xitong Zidonghua/Automation of Electric power systems 2012年第20期36卷 68-73页

作者： Lin, Yi Sun, Hongbin Wu, Wenchuan Yu, Jun Zhang, Boming State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Tsinghua University Beijing 100084 China National Electric Power Dispatching and Communication Center Beijing 100031 China

Formulation of day-ahead operation schedule for large-scale power grid requires security validation, including static security, dynamic and transient stability. It is an important and basic task for day-ahead security validation to generate an AC power flow that satisfies the demand of the schedule. A new method of generating the day-ahead schedule power flow is proposed, which consists in dividing the problem into two subproblems-the active subproblem and the reactive subproblem. The inconsistency of various kinds of schedule data is coordinated by solving the active subproblem, while a rational voltage distribution is achieved by solving the reactive subproblem. Both of the two problems are formulated as optimization models with constraints satisfied and are solved with an interior point algorithm. Numerical test results on the testing system and real power systems show that the method is capable of providing rational day-ahead schedule power flow. © 2012 State Grid Electric power Research Institute Press.

关键词： Numerical methods

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Ultra-short-term wind power prediction based on variational mode decomposition and clustering method

Ultra-short-term wind power prediction based on variational ...

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第三十八届中国控制会议

作者： Liu Chenyu Zhang Xuemin Mei Shengwei Huang Shaowei State Key Lab of Control and Simulation of Power Systems and Generation Equipments (Dept. of Electrical Engineering Tsinghua University)

Wind power ultra-short-term prediction plays a key role in day scheduling of power systems and cross-provincial power trading. However, the randomness and non-stationary nature of wind power, and the mismatch between the training data and the predicted data have become the main obstacles for the improvement of prediction accuracy. This paper proposes a prediction algorithm based on variational mode decomposition(VMD) and clustering. Firstly, the original non-stationary sequence is transformed into several relatively stationary modes utilizing VMD. Secondly, key features can be conveniently selected for each mode, which has a central frequency. Then the k-means clustering method is used to cluster each mode into several typical patterns based on correlation coefficient based distance definition. Finally, the method of "offline training, online matching" is adopted to perform training and prediction process. The actual data of a wind farm in Jilin Province was used to verify the results. The results show that the proposed method can improve the accuracy of ultra-short-term in multi-step prediction of wind power.

关键词： wind power ultra-short-term prediction variational mode decomposition stationary

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