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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Chen Zhang Hua Ye Yanling Du Haitao Liu Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education (Shandong University) Ji'nan China State Grid Jibei Electric Power Company Beijing China

The main inner unbalanced current constituents of the modular multilevel converter (MMC) are the direct current (DC) components and the even circuiting components. Among of them, the inner circulating current will increase the power loss of converters, and reduce the utilization of bridge arm capacities inevitably. Even worse, the current distortion of the bridge arm will be intensified, which will endanger the safe operation of the system. Therefore, it is necessary to take effective measures to suppress the inner circulating current. This paper proposes a novel double-loop circulating current suppressing strategy based on the nonideal proportional resonant (PR) controller, which separately controls the DC components and the circulating components of the inner unbalanced current. Additionally, the circulating components are attached to the feedback signal of the DC component control loop. Meanwhile, by tuning the controller parameters, the closed-loop zeroes and poles can be relocated, and the circulating current suppressing ability as well as the system stability can be enhanced significantly. Furthermore, the double-loop circulating current suppressing controller is designed, followed by the principles of controller parameter tuning. A detailed three-phase MMC model is established in PSCAD/EMTDC simulation environment. The correctness and effectiveness of the proposed strategy get verified.

关键词： Tuning Resonant frequency Mathematical model Gain Bridge circuits Transfer functions

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Prediction of line failure fault based on weighted fuzzy dynamic clustering and improved relational analysis

Prediction of line failure fault based on weighted fuzzy dyn...

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作者： Xiaocheng Meng Renfei Che Shi Gao Juntao He Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education School of Electrical Engineering Shandong University State Grid Hebei Maintenance Branch

With the advent of large data age, power system research has entered a new stage. At present, the main application of large data in the power system is the early warning analysis of the power equipment, that is, by collecting the relevant historical fault data information, the system security is improved by predicting the early warning and failure rate of different kinds of equipment under certain relational factors. In this paper, a method of line failure rate warning is proposed. Firstly, fuzzy dynamic clustering is carried out based on the collected historical information. Considering the imbalance between the attributes, the coefficient of variation is given to the corresponding weights. And then use the weighted fuzzy clustering to deal with the data more effectively. Then, by analyzing the basic idea and basic properties of the relational analysis model theory, the gray relational model is improved by combining the slope and the Deng model. And the incremental composition and composition of the two sequences are also considered to the gray relational model to obtain the gray relational degree between the various samples. The failure rate is predicted according to the principle of weighting. Finally, the concrete process is expounded by an example, and the validity and superiority of the proposed method are verified.

关键词： Prediction of line failure fault based on weighted fuzzy dynamic clustering and improved relational analysis

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Research and Application of Trans-Regional Cooperative Disposal of UHV Interconnected power grid 3

Research and Application of Trans-Regional Cooperative Dispo...

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2017 3rd IEEE International Conference on control Science and Systems Engineering (ICCSSE)

作者： Shan Xin Jiang Yefeng Wu Li Jin Yiding Wang Yiyu Lu Jinjun NARI Group Corporation NARI Technology Co.Ltd State Key Laboratory of Smart Gird Protection and Control Jiangsu Electric Power Company of State Grid of China National Electric Power Dispatching and Control Center State Grid Corporation of China

ISBN: (纸本)9781538604854

With the rapid construction of UHV AC/DC power grid, the integration characteristics of power grid are becoming more and more prominent, and real-time operation control of dispatching is significantly becoming more and more difficult. The existing monitoring and control model based on the system model data cannot meet the requirements for the development of UHV power grid. Based on the existing achievements of dispatching automation system, the general goal and framework of the trans-regional cooperative disposal of UHV interconnected power grid are put forward, and the key technologies are analyzed in four aspects: situation awareness, fault location, joint disposal and cooperative control to provide reference and example for follow-up construction for real-time control and support system for the dispatching of UHV power grid.

关键词： UHV situation awareness cooperative disposal source grid load wide area graphic browsing DC fault diagnosis

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Sub-synchronous torsional interaction with VSC-HVDC affected by feed-forward compensations in current controllers

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The Journal of Engineering 2018年第13期2017卷 2140-2145页

作者： Huafeng Zhou Jiale Chen Qixing Liu Yaping Hu Jianhang Zhu Electric Power Dispatching Control Center of China Southern Power Grid Co. Ltd Guangzhou Guangdong 510623 People's Republic of China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 People's Republic of China

The sub-synchronous torsional interaction (SSTI) behaviour between turbine-generator units and the high-voltage direct current (HVDC) systems has been a vital research content in power systems. In the past, the characteristics of SSTI with line-commutated-converter (LCC)-HVDC have already been well studied. With the development of voltage source converter (VSC)-based HVDC, some researchers have found that different control parameters of the converter have an impact on the electrical damping of the connected synchronous generator system. However, the existing results did not show the specific mechanism of SSTI. In this study, SSTI with VSC-HVDC affected by voltage feed-forward (VVF) compensations in the AC current controllers is investigated. The effects of the asymmetric VVF in both d - and q -axes on electrical damping are paid special attention. First, a general output impedance model of VSC-HVDC concentrated on AC current controllers is developed. Then the influence of compensation factor ( k d/q ) and filter bandwidth ( α f d/q ) on the bandwidth of the converter and the electrical damping is studied. Finally, an SSTI suppression scheme based on the former analysis is given. Simulation studies are carried out in PSCAD/EMTDC, and simulated results validate the analytical results and proposed suppression scheme.

关键词： HVDC power transmission HVDC power convertors voltage-source convertors electric current control voltage control turbogenerators synchronous generators power system stability power transmission control PSCAD-EMTDC SSTI suppression scheme converter bandwidth filter bandwidth compensation factor general output impedance model asymmetric VVF AC current controllers synchronous generator system electrical damping voltage source converter LCC-HVDC systems line-commutated-converter high-voltage direct current systems turbine-generator units SSTI behaviour voltage feed-forward compensations VSC-HVDC systems sub-synchronous torsional interaction

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A Hierarchical Optimal Operation Strategy of Hybrid Energy Storage System in Distribution Networks with High Photovoltaic Penetration

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ENERGIES 2018年第2期11卷 389页

作者： Chen, Jian Li, Jiaqi Zhang, Yicheng Bao, Guannan Ge, Xiaohui Li, Peng Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250061 Shandong Peoples R China Nanyang Technol Univ Sch Elect & Elect Engn Singapore 639798 Singapore State Grid Shandong Elect Power Dispatching & Con Jinan 250001 Shandong Peoples R China State Grid Zhejiang Elect Power Co LTD Elect Power Res Inst Hangzhou 310014 Zhejiang Peoples R China

In this paper, a hierarchical optimal operation strategy for a hybrid energy storage system (HESS) is proposed, which is suitable to be utilized in distribution networks (DNs) with high photovoltaic (PV) penetration to achieve PV power smoothing, voltage regulation and price arbitrage. Firstly, a fuzzy-logic based variable step-size control strategy for an ultracapacitor (UC) with the improvement of the lifetime of UC and tracking performance is adopted to smooth PV power fluctuations. The impact of PV forecasting errors is eliminated by adjusting the UC power in real time. Secondly, a coordinated control strategy, which includes centralized and local controls, is proposed for lithium-ion batteries. The centralized control is structured to determine the optimal battery unit for voltage regulation or price arbitrage according to lithium-ion battery performance indices. A modified lithium-ion battery aging model with better accuracy is proposed and the coupling relationship between the lifetime and the effective capacity is also considered. Additionally, the local control of the selected lithium-ion battery unit determines the charging/discharging power. A case study is used to validate the operation strategy and the results show that the lifetime equilibrium among different lithium-ion battery units can be achieved using the proposed strategy.

关键词： hybrid energy storage system (HESS) hierarchical operation strategy photovoltaic (PV) fuzzy-logic lifetime equilibrium

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A Novel Method for Economic Dispatch with Across Neighborhood Search: A Case Study in a Provincial power grid, China

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COMPLEXITY 2018年第1期2018卷

作者： Xiong, Guojiang Zhang, Jing Yuan, Xufeng Shi, Dongyuan He, Yu Yao, Yao Chen, Gonggui Guizhou Univ Guizhou Key Lab Intelligent Technol Power Syst Coll Elect Engn Guiyang 550025 Guizhou Peoples R China Huazhong Univ Sci & Technol State Key Lab Adv Electromagnet Engn & Technol Wuhan 430074 Hubei Peoples R China Guizhou Elect Power Grid Dispatching & Control Ct Guiyang 550002 Guizhou Peoples R China Chongqing Univ Posts & Telecommun Minist Educ Key Lab Network Control & Intelligent Instrument Chongqing 400065 Peoples R China

Economic dispatch (ED) is of cardinal significance for the power system operation. It is mathematically a typical complex nonlinear multivariable strongly coupled optimization problem with equality and inequality constraints, especially considering the valve-point effects. In order to effectively solve the problem, a simple yet very young and efficient population-based algorithm named across neighborhood search (ANS) is implemented in this paper. In ANS, a group of individuals collaboratively navigate through the search space for obtaining the optimal solution by simultaneously searching the neighborhoods of multiple superior solutions. Four benchmark test cases with diverse complexities and characteristics are firstly employed to comprehensively verify the feasibility and effectiveness of ANS. The experimental and comparison results fully demonstrate the superiority of ANS in terms of the final solution quality, convergence speed, robustness, and statistics. In addition, the sensitivities of ANS to variations of population size and across-search degree are studied. Furthermore, ANS is applied to a practical provincial power grid of China. All the comparison results consistently indicate that ANS is highly competitive and can be used as a promising alternative for ED problems.

关键词： Sensitivity analysis

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A routing optimization model for EMS of power systems considering cyber-physical interdependence

A routing optimization model for EMS of power systems consid...

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

作者： Xu, Luo Guo, Qinglai Sun, Hongbin Su, Zhuo State Key Laboratory of Power Systems Department of Electrical Engineering Tsinghua University Beijing100084 China Guangdong Province Power Dispatching and Control Center China Southern Power Grid China

ISBN: (纸本)9781538614273

The development of smart grids makes the dependence of power systems on information systems increasing. However, the optimal routing of power communication networks does not mean the routing for power systems is optimal. Besides, power communication networks are different from ordinary, public communication networks, as the secondary system of power systems, the primary purpose is to ensure the reliability of power systems. Based on the cyber-physical sensitivity analysis, the importance of information flow can be evaluated. Then, a dynamic CPS optimal routing model distinguishing the importance of information flow is proposed to configure more reliable and shorter path to higher importance information flow. Case study on different scenarios of a modified IEEE 14-bus system demonstrates the validity of the proposed routing optimization model. © 2017 IEEE.

关键词： Cyber Physical System

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Hexagon-Shaped Screw Recognition and Positioning System Based on Binocular Vision

Hexagon-Shaped Screw Recognition and Positioning System Base...

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第37届中国控制会议

作者： Fang Wang Xin Chen Chang Tan Jinbin Li Yaodong Zhang School of Automation China University of Geoscience Hubei key Laboratory of Advanced Control and Intelligent Automation for Complex Systems State Grid Hubei Electric Power Research Institute

Traditional artificial live work asks for a high standard with operator’s mental state and technical level in high-voltage and strong-magnetic environment,which not only reduces the efficiency of modern production and living but also causes potential threats to the safety of ***,developing robot live work has great significance for both academic research and industrial applications.A key problem of the live work for an industrial robot is recognition and positioning of the hexagonshaped screw in substation with high *** solve this problem,this article designs a hexagon-shaped screw recognition and positioning system based on binocular vision in transformer substation.A method for stereo matching including 3 steps is proposed:edge noise of the target is reduced by median filter at the beginning;then the target can be obtained through the image segmentation method of adjusting threshold;further moments are used to express the centers of hexagons in 2 images which work as stereo matching *** depth information can be obtained due to visual geometric relationships based on stereo model and camera calibration parameters based on camera *** experiment results show that the binocular system designed in this article can accurately identify the target with good stability,and the measurement error is controlled in 4%.

关键词： Binocular stereo vision Image segmentation Stereo matching Depth information

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Optimal Consensus control of Unknown Nonlinear Multi-Agent Systems Using Adaptive Dynamic Programming via MRAC

Optimal Consensus Control of Unknown Nonlinear Multi-Agent S...

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第37届中国控制会议

作者： Hao Fu Xin Chen Wei Wang Jinbin Li Yaodong Zhang School of Automation China University of Geosciences Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems State Grid Hubei Electric Power Research Institute

This paper introduces an optimal consensus control scheme for nonlinear multi-agent systems with completely unknown dynamics. In general, it is difficult to solve the coupled Hamilton-Jacobi-Bellman（HJB） equations, which the optimal consensus control relies on in multi-agent systems, especially unknown nonlinear systems. For the purpose of solving the problem, we propose an optimal consensus control approach based on the model reference adaptive control（MRAC） and adaptive dynamic programming（ADP）. Using the structure of the diagonal recurrent neural network, the identifier and controller are devised to achieve MRAC for every plant of the unknown nonlinear systems, i.e. the reference model serves as a dynamic model of each individual agent. Then, according to reference models of distributed agents, an adaptive dynamic programming（ADP）is introduced to approximate the solution of the coupled HJB equations.

关键词： Multi-agent systems optimal consensus model reference adaptive control adaptive dynamic programming

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A future outlook for cyber-physical power system

A future outlook for cyber-physical power system

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

作者： Su, Zhuo Xu, Luo Xin, Shujun Li, Weijian Shi, Zhan Guo, Qinglai Guangdong Province Power Dispatching and Control Center China Southern Power Grid China State Key Laboratory of Power Systems Department of Electrical Engineering Tsinghua University Beijing100084 China

ISBN: (纸本)9781538614273

The energy management system (EMS) is an indispensable advanced information system for smart grids. EMS makes the power system efficient and safe operation, but also makes the power system more dependent on it. This paper analyzes the related research of CPS modeling and CPS assessment for power systems. Besides, with the development of smart grid and Energy Internet, integrated energy management system (IEMS), distributed EMS and cloud EMS are developed. Meanwhile, the research on information masking algorithm for data protection of cloud EMS is analyzed. Finally, a future outlook for cyber-physical power system in CPS modeling, assessment and information protection is given. © 2017 IEEE.

关键词： Energy management systems

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