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Sustainable power and Energy Conference (iSPEC)

作者： Chao Luo Qi Guo Xiangning Xiao A.M Gole Mengjun Liao State Key Laboratory of HVDC Electric Power Research Institute State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing China Electrical and Computer Engineering Department University of Manitoba Winnipeg Canada

ISBN: (纸本)9781728149318

Subsynchronous Resonance (SSR) is a potential threat for long distance power transmission from doubly fed induction generator (DFIG) based wind farms with fixed series compensation (FSC). In this paper, subsynchronous resonance damping control (SSRDC) strategy based on shunt voltage source converter is proposed. Taking account of different series compensation levels and wind speeds, several potential inputs to the SSRDC are investigated. SSRDC control parameters are determined via root locus techniques to ensure the system stability of subsynchronous modes. Considering implementation feasibility in practical project and stability of supersynchronous modes, an enhanced SSRDC is proposed. Impact of transmission line and DFIG parameters and the reactive power compensation to the mitigation effect is investigated. Time domain simulation using PSCAD/EMTDC are carried out to validate the effectiveness of the SSRDC.

关键词： Doubly fed induction generator (DFIG) fixed series capacitor compensation (FSC) Subsynchronous Resonance (SSR) voltage source converter (VSC) Subsynchronous Resonance damping controller Wind farms subsynchronous resonance damped control system stability power transmission reactive compensation series compensation double-fed induction generator TIME-DOMAIN Transmission Lines Compensation depth

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Unreasonable reactive power flow of traditional SVC and a novel SVC model against it

Unreasonable reactive power flow of traditional SVC and a no...

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2019 IEEE PES Innovative Smart Grid Technologies Asia, ISGT 2019

作者： Ge, Huaichang Chen, Tianhua Chen, Hao Ding, Haoyin Guo, Qinglai Wang, Bin Xu, Fengda State Key Laboratory of Power Systems Department of Electrical Engineering Tsinghua University Beijing100084 China NARI Group Corporation State Grid Electric Power Research Institute Nanjing211106 China NARI Technology Co. Ltd. Nanjing211106 China State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China East China Grid Corporation No. 882 Pudong South Road Shanghai200120 China

ISBN: (纸本)9781728135205

Recent years, various types of reactive power resources are installed in the power grid. Both of the complexity of and demand for better voltage regulation are increasing. AVC system is the most famous system-wide Q/V control system which consists of PVC, SVC and TVC. SVC controls the voltages of buses within a control zone by sending individual set-point values to PVCs belonging to the control zone. Traditional SVC assumes that PVCs within a control zone is decoupled and each PVC can reach the set-point value during a control period. However, the proof in this paper reveals the fact that if there are strongly coupled PVCs in a control zone, the competition between those PVCs will cause unreasonable reactive power flow. PVCs can't reach their set-points so a deviation of Q output is induced. In this paper, a novel SVC model is proposed so as to eliminate the Q deviation. Simulation work verified the proof and demonstrated the effectiveness of the proposed SVC model. © 2019 IEEE.

关键词： Electric load flow

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Flexible unbalanced control with peak current limitation for virtual synchronous generator under voltage sags

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Journal of Modern power systems and Clean Energy 2018年第1期6卷 61-72页

作者： Tianwen ZHENG Laijun CHEN Yan GUO Shengwei MEI State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Department of Electrical Engineering Tsinghua University Qinghai Key Lab of Efficient Utilization of Clean Energy New Energy Photovoltaic Industry Research Center Qinghai University

Virtual synchronous generator(VSG)is gridfriendly for integrating distributed generations(DGs)since it can emulate the operation mechanism of traditional synchronous generator(SG).However,the traditional VSG control strategy,which is mainly suitable for balanced voltage conditions,may lead to power oscillations,current unbalance and even overcurrent under unbalanced voltage *** overcome this difficulty,a flexible unbalanced control with peak current limitation for VSG under unbalanced operating conditions is *** on the basic VSG control algorithm,the control strategy integrates two novel control modules,which are current reference generator(CRG)and power reference generator(PRG).The proposed control strategy can flexibly meet different operation demands,which includes current balancing,constant active or reactive *** the injected currents are kept within safety values for a better utilization of the VSG power ***,the experimental platform is *** results demonstrate the validness and effectiveness of the proposed control strategy.

关键词： Virtual synchronous generator Unbalanced control Current reference generator power reference generator Voltage sags

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Online Optimal power control of an Offshore Oil-Platform power system

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Technology and Economics of Smart Grids and Sustainable Energy 2018年第1期3卷 1-13页

作者： Xie, Xiaorong Zhong, Jianliang Sun, Yingyun Wang, Jianfeng Wei, Che State Key Laborarory of Power System Department of Electrical Engineering Tsinghua University Haidian District Beijing100084 China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Source North China Electric Power University Changping District Beijing102206 China China National Offshore Oil Corporation Research Institute Chaoyang District Beijing100033 China

Offshore oil-platform power systems are important infrastructure for the exploitation of maritime oil and gas. However, its current energy management system, with relatively simple control scheme and low-level automation, can hardly operate the system in a secure and economic manner to match the rapid progress of offshore oil and gas exploitation. To address this issue, an online multi-objective optimal power control strategy is proposed and implemented based on the existing SCADA system. By incorporating network loss, gas consumption and voltage deviation into a synthesized objective function and taking the various operational constraints into account, the power-control task is formulated into a mixed-integer nonlinear optimized problem. And then an efficient procedure that combines the interior point method and the fast branch and bound method is developed to solve the problem. Consequently the optimal control strategy can be obtained online and either system security or operational efficiency is achieved. The developed control system has been put into practical use in the Weixinan offshore oil-platform power system (China’s first of its kind). Field test results show that it can coordinate active and reactive power for online optimal control as per the changes of operating conditions. The improved safety, efficiency and power quality of the power system will definitely promote exploitation of offshore oil and gas in the respect of both security and efficiency. © 2018, Springer Nature Singapore Pte Ltd.

关键词： Branch and bound method

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Vertically integrated outdoor in-site line protection based on SoC technique

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Global Energy Interconnection 2018年第2期1卷 179-186页

作者： Tonghua Wu Yuping Zheng Yutao Qiu Xiaoping Zhang Gang Yao Jimin Chai Xiaofan Hou College of Energy and Electrical Engineering Hehai University NARI Group Corporation/State Grid Electric Power Research Institute State Key Laboratory of Smart Grid Protection and Control State Grid Zhejiang Electric Power Corporation Electrical and System Engineering University of Birmingham

By focusing on the problems of speed, reliability, operation and maintenance in the practical application of line protection in conventional and smart substations, we propose system architecture and a technical scheme for in-site(similar in meaning to on-site or near-process) line protection based on vertical integration and outdoor installation. The functions of the single-bay merging unit, relay protection, and intelligent terminal are vertically integrated to reduce the number and types of devices, simplify the configuration, reduce signal transmission, and shorten the protection action time. In addition, this vertically integrated device is applied to provide data acquisition and control execution support for substation-area protection, security and stability of devices, and other substation-area devices. The vital performance outputs are tested and compared. Finally, the experimental results verify that the proposed scheme is feasible and the technology is advanced.

关键词： Line protection In-site relay protection Merging unit Vertical integration

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Research on Optimization Matching of Wind/Solar/Hydro/Storage Flexibility Resource system Considering Electric Vehicle Access

Research on Optimization Matching of Wind/Solar/Hydro/Storag...

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2019 4th Asia Conference on power and electrical engineering (ACPEE 2019)

作者： Chunhui Qu Wenwen Sun Siyu Tao Qingshan Xu Bo Yang State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute College of Electrical Engineering Southeast University State Grid Liaoning Electric Power Company Limited Economic Research Institute

With the development of distributed generation technology and the requirement of power system flexibility,the research on multiple flexible resource optimization is carried *** on the traditional optimal configuration of wind-solar-hydro-storage system,this paper takes electric vehicle into ***,the model of each flexible resource is ***,a comprehensive evaluation index system is *** the flexible resources in a city on the eastern coast of China as a case,multi-objective grey wolf optimization algorithm and entropy weight method are applied to do the optimization and *** simulation result shows that in the optimal configuration,not only the renewable resources can be effectively utilized,but also the requirement of load in different period can be ***,the total investment can be greatly *** addition,the participation of electric vehicles can not only improve the performance of the hybrid system,but also increase the income of EV holders.

关键词： Research on Optimization Matching of Wind/Solar/Hydro/Storage Flexibility Resource system Considering Electric Vehicle Access

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Travelling waves-based fault location scheme for feeders in power distribution network

Travelling waves-based fault location scheme for feeders in ...

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作者： Shi, Shenxing Lei, Aoyu He, Xin Mirsaeidi, Sohrab Dong, Xinzhou State Key Laboratory on Power System Department of Electrical Engineering Tsinghua University Beijing100084 China Power Dispatching and Control Center Guiyang550000 China

Fault location in distribution systems is difficult for multiple discontinuities, such as branch and junction points on feeders. This paper proposes a scheme for fault location in distribution systems using network topology information and circuit breaker reclosure-generating travelling waves. Based on the topology information, the circuit breaker closure-generating travelling waves can be got through analysis. When a permanent fault occurs, the circuit breaker reclosure-generating travelling waves contain the information on fault position. In this paper, the difference between the pre-fault travelling waves and post-fault travelling waves induced by the breaker reclosing in a feeder, defined as reclosing superimposed travelling waves, is calculated. For the reclosing superimposed travelling waves, the initial travelling wave reflects the fault distance. Subsequently, wavelet transform is applied to extract the travelling wave reflected from the fault point. Finally, the time difference between the reclosing instant and the arrival instant of the reflected travelling wave is employed to calculate the fault distance. In order to verify the effectiveness of the proposed scheme, several simulations were carried out using ATP-EMTP software. The simulation results indicated that the proposed scheme can be effective in fault location for distributed feeders, regardless of grounding system type. © Institution of engineering and Technology. All rights reserved.

关键词： Wavelet transforms

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Cluster-based Relevance Analysis Between Construction Mode and BCR for Optimizing the DAS

Cluster-based Relevance Analysis Between Construction Mode a...

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Data Driven control and Learning systems (DDCLS)

作者： Jiran Zhu Hua Leng Haiguo Tang Min Fan Yaling Liu Qing Yang College of Electronic and Information Engineering Tongji University Jiading Shanghai China State Grid Corporation of Hunan Electric Power corporation research institute Changsha Hunan China College of Electrical and Information Engineering Hunan University Changsha Hunan China School of Automation Chongqing University Chongqing Key Laboratory of Complex System Safety and Control (Ministry of Education) Chongqing University Chongqing China

ISBN: (数字)9781728159225

ISBN: (纸本)9781728159232

Distribution automation system (DAS) is the key of intelligent power distribution. With the construction and operation of DAS, studying on the optimization of DAS has received much attention from both academia and industry. This study proposed cluster-based relevance analysis between construction mode and benefit-cost ratio (BCR) for optimizing the DAS. This method clusters the DASs of different cities, and analyzes the clustering results. Then, the method analyzes BCR of DAS in different categories and uses comparative analysis, grey relational analysis (GRA) and sensitivity analysis to analyze the relevance between the construction mode and BCR of typical city's DAS and determine the major factors affecting the BCR comprehensively. Finally, it integrates all analysis results to make optimization suggestions for DAS. The case study shows that the method is effective and feasible, which can provide direction and reference basis for the optimization of DAS in cities of different scale.

关键词： Urban areas Principal component analysis Investment Optimization Sensitivity analysis power distribution Automation

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Algorithm of DFT Phasor Measurement based on Frequency Tracking 2

Algorithm of DFT Phasor Measurement based on Frequency Track...

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2nd IEEE International electrical and Energy Conference, CIEEC 2018

作者： Guo, Hehong Yan, Xiaohong Guo, Zun Zhao, Qingsheng Zhang, Jie Wang, Xuping Lvliang Electric Power Company Lvliang033000 China School of Electrical and Electronic Engineering North China Electric Power University Beijing102206 China Shanxi Key Laboratory of Power System Operation and Control College of Electrical and Power Engineering Taiyuan University of Technology Taiyuan030024 China

ISBN: (纸本)9781538653913

In the case of power signal frequency deviation, traditional discrete Fourier transform (discrete Fourier transformation, DFT) is used to realize synchronous phasor measurement, which will cause fence effect and spectrum leakage, and seriously reduce the accuracy of the calculation. For this reason, an improved modified DFT algorithm for phasor measurement is proposed in this paper. Firstly, the frequency tracking algorithm is introduced, which is used to calculate fundamental frequency. Then the DFT error mechanism in the non-synchronous sampling is analyzed. The functional relation between the amplitude and phase errors and frequency deviation is obtained. A method of reducing spectrum leakage is proposed and the amplitude and phase errors expressions are improved. Finally the performance of the algorithm is tested by different signal models and actual data. The simulation results show that the proposed algorithm meets the accuracy requirements of synchronized phasor measurement. © 2018 IEEE.

关键词： Phasor measurement units

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Multipriority Hierarchical Reactive power and Voltage Optimization Strategy for a Large-scale New Energy Island system Delivered by VSC-HVDC

Multipriority Hierarchical Reactive Power and Voltage Optimi...

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China International electrical and Energy Conference (CIEEC)

作者： Man Xu Ruifang Zhang Linlin Wu Shangqiang Li Ying Qiao Grid-connected Operation Technology for Wind-Solar-Storage Hybrid System State Grid Corporation Key Laboratory Electric Power Research Institute State Grid Jibei Electric Power Co. Ltd Beijing China Department of Electrical Engineering Tsinghua University Beijing China

ISBN: (数字)9781728116754

ISBN: (纸本)9781728116761

VSC-HVDC plays an important role in transmitting large-scale new energy power. The fast reactive power regulation of the converter station and the unique topology of new energy cluster require special reactive power and voltage control strategy. This paper has proposed a multipriority hierarchical reactive power and voltage optimization strategy for a large-scale new energy island system delivered by VSC-HVDC. This strategy takes objectives of the dynamic reactive power margin of converter station, voltage safety margin of PCC point, reactive power coordination factor of each new energy station and system power loss into consideration, and has been verified based on the planning of Zhangbei VSC-HVDC project. The strategy can keep the dynamic reactive power margin and voltage safety margin at high level with acceptable power loss, and improve resolving speed at the same time.

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