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第37届中国控制会议

作者： Xiao Buqiong Li Yan STATE GRID Tibet Electric Power Company Limited State Key Laboratory of Operation and Control of Renewable Energy Storage Systems

PV power and other clean energy have different characteristics, including PV power is intermittent, random characteristics, unpredictable, unable to participate in the power balance. At the same time, PV power needs the support of solar radiation. The capability of PV power increases with the increase of solar radiation, so it can only generate electricity dur ing the daytime and can not generate electricity at night, and the power generation rate in rainy and snowy days is lower. The power of PV power is greatly affected by the weather and changes faster than the normal load of the power grid. When there is cloud cover in the sky, the PV power capacity will be reduced rapidly by almost 70%. Therefore, analyzing the impact of large-scale PV grid-connected system and its countermeasures is an urgent problem to be solved in the development of PV power. Corresponding research needs to be carried out to ensure the reliable operation of large-scale grid-connected PV grid. In order to ensure the safe and stable operation of the system, the PV power station must meet the corresponding requirements in terms of power grid quality, active power control, voltage regulation, low voltage ride through, frequency stability and safety protection. Based on the influence of cloud cover and sudden changes of weather, this paper studies the situation that the output of PV power will plunge and then rise sharply, based analyzes the time series output characteristics of grid-connected PV power station. The influence of the fluctuation of grid voltage fluctuation and line load rate caused by the change of PV power on the power flow is simulated and analyzed.

关键词： PV Connection to grid power Flow Time Series Output Characteristics

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Day-ahead optimal scheduling of integrated energy system with electric heat pump

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IOP Conference Series: Earth and Environmental Science 2020年第1期431卷

作者： Nianchu Zhang Qi Wang Ming Ni Manli Li Zheng Zhang Nanjing Normal University (College of Electrical and Automation Engineering) Nanjing China NARI Group Corporation (State Grid Electric Power Research Institute) Nanjing China NARI Technology Co. Ltd. Nanjing China State Key Laboratory of Smart Grid Protection and Control Nanjing China

The regional integrated energy system is an effective way to realize energy cascade utilization and improve the flexibility and economy of the load side operation. Combine cooling heating and power (CCHP) system is a typical form of integrated energy systems. However, due to heat-load-based operation mode, the peak modulation capacity of CCHP units and the accommodation of renewable energy are limited. This paper explores methods of increasing the flexibility and economy of the system. An optimal scheduling model is proposed for integrated energy systems containing an electric heat pump, considering heating network characteristics. Simulation results show that the electric heat pump can help the system realize heat-and-power decoupling, improve the flexibility of the system and reduce the operating cost of the system.

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A new information publishing system for mobile terminal by location-based services based on iot 5th

A new information publishing system for mobile terminal by l...

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5th International Conference on Geo-Spatial Knowledge and Intelligence, GSKI 2017

作者： Zhu, Li Ma, Guoguang Hubei Collaborative Innovation Center for High-Efficient Utilization of Solar Energy Hubei University of Technology Wuhan China Hubei Key Laboratory for High-Efficiency Utilization of Solar Energy and Operation Control of Energy Storage System Hubei University of Technology Wuhan China Hubei Power Grid Intelligent Control and Equipment Engineering Technology Research Center Wuhan China Network Technology Company Limited Xiamen China

ISBN: (纸本)9789811308956

In this paper, a new information publishing system based on Internet of things is proposed. It mainly consists of three parts: the screen side, the service side and the client side. And all of them connect each other by network. The screen side has realized the internet of screens in which geographically dispersed independent screens are connected to the internet by the customized set-top boxes. The server cluster provides high performance application services and manages the promptly increasing multimedia publishing information to users on the service side. Meanwhile MQTT protocol is deployed to implement a lightweight broker-based publish and subscribe messaging mechanism in our constrained environments to solve the bandwidth bottleneck. On the client side, the mobile terminal user can release information with dedicated software by location-based services. The paper has realized a prototype SzIoScreen, and give some related test results. © Springer Nature Singapore Pte Ltd. 2018.

关键词： Location based services

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Comprehensive Evaluation of Microgrid Planning Scheme based on AHP- Entropy method

Comprehensive Evaluation of Microgrid Planning Scheme based ...

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Sustainable power and Energy Conference (iSPEC)

作者： Jun HE XiaoLing YANG Yi LIU WenTao HUANG Jun CHEN DaHu LI Hubei Key Laboratory for High-efficiency Utilization of Solar Energy and Operation Control of Energy Storage System Hubei University of Technology Wuhan P. R. China School of Electrical and Electronic Engineering Hubei University of Technology WuHan China Hubei University of Technology WuHan China State Grid Hubei Electric Power Co. Ltd WuHan China

Microgrid has the advantages of low carbon, energy saving and economy. The development direction of distribution network is distribution network with microgrid. In order to evaluate the rationality of microgrid planning comprehensively and scientifically, this paper establishes a comprehensive evaluation index system of microgrid from four aspects: economy, reliability, basic structure of planning and environmental protection. In order to overcome the subjectivity of simple Analytic hierarchy process (AHP), AHP- entropy method is introduced to configure the weights of microgrid indexes, and a comprehensive evaluation method of microgrid planning scheme based on AHP- entropy method is proposed for the first time. Finally, an example of an island microgrid in Zhuhai is taken to verify the feasibility of the proposed method.

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Research on double-loop circulating current suppressing strategy based on nonideal PR controller for modular mulitlevel converter

Research on double-loop circulating current suppressing stra...

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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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Development of Live Working Robot for Distribution Network

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IOP Conference Series: Earth and Environmental Science 2019年第6期237卷

作者： Yu Yan Lanlan Liu Zhanfan Zhou Ying Fan State Grid of Hunan Electric Power Company 410100 China Hunan Province Key Laboratory of Intelligent live working Technology and Equipment (Robot) 410100 China State Grid Corporation Laboratory of Live-working Inspection an Intelligent Operation Technology 410100 China

The distribution network is the key link to ensure the continuous power supply. The live working of the distribution network has become an important means to ensure the reliability of power supply and improve the reliability of power supply. This article designs a suitable application according to the task of live working of the distribution network and the analysis of the working objects. A live working robot which is used for distribution network with a voltage level of 10 kV or less. The robot is composed of a mobile insulation platform, a robot body, a working end, an insulation protection system, and a control system, where in the robot body includes a control box, a work robot, and a work tool transfer device. The end of the operation includes a grip end, a wire stripping end, and a clip mounting end. The results show that the robot can replace the manual task of charging and disconnecting wires, reduce the labor intensity of the operators and ensure the safety of the operators.

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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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A review of stability control technologies for power systems in China

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IOP Conference Series: Earth and Environmental Science 2019年第3期227卷

作者： Jianbo Luo Xijian Dong Feng Xue Yanhong Wei Bijun Li Jie Pan Xiaodan Cui Nan Liu NARI Group Corporation(State Grid Electric Power Research Institute) Nanjing 211106 China State Key Laboratory of Smart Grid Protection and Operation Nanjing 211106 China Guizhou Jinzhou Electric Power Co. Ltd Jinzhou 562400 China State Grid Shanxi Electric Power Company Taiyuan 030001 China State Grid Baoding Electric Power Supply Company Baoding 071027 China

During the transitional period of UHV network construction, the power grid's characteristics of 'Strong DC and Weak AC' are prominent. Moreover, the high penetration of renewable energies has made the characteristics of power systems profoundly changed facing high operation risks. The security and stability control technologies need to be reviewed considering current development situations and combine the characteristics of the grid to make innovation. This paper analyses the development and status quo of stability control technologies from the security and stability control systems which belong to the second defense line. Moreover, frequency and voltage emergency control devices and out-of-step separation devices which belong to the third defense line, as well as features of the security and stability control devices are investigated. According to the planning and development of the future power grid, the development directions of the security control technology is pointed out.

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Short-term wind power probabilistic forecasting considering spatial correlation

Short-term wind power probabilistic forecasting considering ...

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

作者： Wang, Junxiong Han, Xueshan Jiang, Jiayin Li, Wenbo Ma, Yanfei Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China State Grid Shandong Electric Power Rresearch Institute Jinan China State Grid Jinan Power Supply Company Jinan China

ISBN: (纸本)9781538614273

Wind power probabilistic forecasting is of great significance to the operation and dispatch of the power system. However, most researches have focused on how to predict wind power using local information rather than spatial correlation information of multiple wind farms in a region. In this paper a short-term wind power probabilistic forecasting approach considering spatial correlation is proposed. Originally, a set of explanatory variables highly correlated with the target variable is selected by calculating mutual information. Next, the principal component analysis can help to reconstruct the data and reduce the dimension of the explanatory variables. Finally, the conditional kernel density estimation is introduced to predict the short-term wind power of the target wind farm. Case studies on the dataset of Global Energy Forecasting Competition 2014 verify that the proposed approach can achieve better performance than traditional approach. © 2017 IEEE.

关键词： Principal component analysis

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Design of Obstacle Avoidance Mechanism of Magnetic Levitation Type Inspection Robot for High Voltage Lines

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IOP Conference Series: Earth and Environmental Science 2019年第3期237卷

作者： Yu Yan Xianjin Xu Xi Peng Wen Li State Grid Hunan Electric Power Co. Ltd. Overhaul Company 430205 Live Inspection and Intelligent Operation Technology State Grid Corp Laboratory 430205 Hunan Key Laboratory of Intelligent Live Working Technology and Equipment(Robot) 430205 Department of Mechanical Engineering Hubei University of Technology 430068

An obstacle avoidance mechanism is designed for the operation mode and the overall structure of high-voltage power lines inspection robot based on magnetic levitation principle. The mechanism is composed of a planar linkage mechanism and a screw nut mechanism with two degrees of freedom. Through the control of two of the original, the robot has a function of opening the shell and obstacle avoidance. The mechanism is simple and occupies less space with flexible movement, compact structure, to meet the requirements of obstacle avoidance to avoid vibration hammer, clamp, straight line towers and other obstacles effectively which solved the contradiction between the small space in the robot and the obstacle avoidance requirements. Two prime bar linkage relationships is obtained according to static analysis of the mechanism. Finally, by means of Kinematics simulation of the obstacle process through Pro/E software, the feasibility of the institution obstacle scheme is verified.

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