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6th International Conference on Renewable Power Generation

作者： Tan, Yong Chen, Rong Wang, Meng Zhang, Min Hou, Mingguo NARI Group Corporation State Grid Electric Power Research Institute Nanjing21106 China NARI Technology Development Co. Ltd. Nanjing211061 China State Key Laboratory of Smart Grid Protection and Control Nanjing210061 China School of Rail Transportation Soochow University Suzhou215131 China

With the rapid development of renewable energy power generations, AC/DC transmissions and static compensations etc., power electronic technology has been widely applied in power system. As traditional power equipment is replaced by a large number of power electronic devices, the disturbances such as harmonic interference and sub-synchronous oscillation are more frequently. In order to detect the subsynchronous oscillation in power system in time, and take measures to ensure the safety and stability of power system, this article analyses the algorithm principle of the phasor measurement unit (PMU) and the communication architecture of wide area measurement system (WAMS)/ PMU system. According to the IEEE Std C37.118-2011 standard, it elaborates the problems and the limitations existing in the monitoring of sub-synchronous and super-synchronous harmonic parameters on WAMS. On the basis of the above, a method of online identification and alarm for the sub-synchronous and super-synchronous harmonic parameters on PMU device is proposed. Combined with the fast Fourier transform spectrum correction theory, the high-accuracy identification method of distributed sub-synchronous and super-synchronous harmonic parameter is realised. The feasibility and accuracy of the method is verified by simulation experiments. © 2017 Institution of Engineering and Technology. All Rights Reserved.

关键词： Fast Fourier transforms

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Research on the grabcut image segmentation method based on superpixel

Research on the grabcut image segmentation method based on s...

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International Conference on Intelligent System and Knowledge Engineering, ISKE

作者： Yang Liu Ningning Zhou Guofang Huang School of Computer Nanjing University of Posts and Telecommunications Nanjing China Nanjing University of Posts and Telecommunications Nanjing China State Key Laboratory of Smart Grid Protection and Control Nanjing China

In order to overcome the Excessive time complexity of bad quality when the disposing the picture whose foreground is similar to background of grabcut method, a grabcut method based on superpixel is proposed in this paper. This method, firstly, extracting the superpixel block of the picture. And then, split the picture which is extracted. The experimental results show that this method is effective to improve the speed of segmentation. What's more, this method can solve the problem of bad quality when the disposing the image whose foreground is similar to background in a certain extent. This paper has certain advantage in disposing those image whose size are too big and foreground is similar to background.

关键词： Image segmentation Image color analysis Algorithm design and analysis Clustering algorithms Feature extraction Partitioning algorithms Time complexity

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Frequency Characteristic of New-type Load Considering Power Electronics Technology

Frequency Characteristic of New-type Load Considering Power ...

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IEEE International Conference on Cyber Technology in Automation, control, and Intelligent Systems

作者： Qian Chen Meng Jiang Ping Ju Xin Shan Bo Wang Yi Wang Fangzhao Yu Lin Xu Chuan Qin College of Energy and Electrical Engineering Hohai University Nanjing China NARI Group Corporation State Key Laboratory of Smart Grid Protection and Control Nanjing China

ISBN: (纸本)9781538604915

Power electronics based load equipment has now more and more used in power grid these years. Their frequency characteristic is worthy of study in detail for it is very different from that of traditional load equipment, and the regular load model may not be suitable such as in the security and stability analysis of modern power system. Firstly, so much these new-type load equipment are classified in several typical categories. Then, response curves are obtained from physical experiment. Thereafter, the static frequency characteristic of new-type loads is discussed and the trend of parameters is predicted. Finally, compared with the recording curves of a real bulk power grid during large frequency disturbs, the change of parameter is verified and the potential impact on power grid is analyzed.

关键词： Power grids Reactive power Motor drives Power system stability Switches Power supplies Load modeling

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Modelling and control of doubly fed variable-speed pumped storage units for grid power regulation

Modelling and control of doubly fed variable-speed pumped st...

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6th International Conference on Renewable Power Generation

作者： Guopeng, Zhao Qiang, Zhao Jiyun, Ren Xiaofang, Song Minxiao, Han State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing102206 China School of Electrical and Electronic Engineering North China Electric Power University Beijing102206 China State Key Laboratory of Smart Grid Protection and Control Nanjing Jiangsu Province211006 China

With the expending scale of the power grid and the substantial development of renewable energy generation system, the demand for power quality is becoming more and more significant. The doubly fed pumped storage can be an effective method to control the power of the power grid and restrain the power grid fluctuation caused by renewable energy generation. First, this study introduces the structure of doubly fed pumped storage unit, and analyses the mathematical model of reversible hydraulic pump turbine, doubly fed induction generator (DFIG) and control strategy of the converter. On the basis of the model of reversible hydraulic pump turbine and DFIG, control strategies of the dq decoupling and synchronous rotating coordinate system are studied to output the active and reactive power. Second, the models of generating mode and pumping mode for the doubly fed pumped storage unit are established. Third, for the grid power regulation, active power and speed control strategy in generating mode, pumping mode are put forward. Finally, the model of doubly fed pumped storage unit of 300 MW is established in MATLAB/Simulink. The proposed control strategy is verified by the simulation results. © 2017 Institution of Engineering and Technology. All Rights Reserved.

关键词： Renewable energy resources

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Active Distribution Network Secondary Coordinated Voltage control Based on Multi-Objective Linear Programming

Active Distribution Network Secondary Coordinated Voltage Co...

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“紫金论电”2017智能电网保护和运行控制国际学术研讨会

作者： LU Wen TU Mengfu DING Qia DU Hongwei NARI Group Corporation(State Grid Electrical Power Research Institute) NanjingChina211106 NARI Technology Co. Ltd.Nanjing211106 State Key Laboratory of Smart Grid Protection and Control NanjingChina211106

Distribution network with a large number of distributed generators(DG)puts forward higher requirements for coordinated control of voltage and reactive *** coordinated voltage control is an effective method to improve distribution network voltage level under the condition of high permeable *** on the basic principle of the secondary coordinated voltage control,multi-objective linear programming method is used to solve the contradiction between the safety and the economy of the distribution network,and the optimization goal construction,control strategy selection and control process realization are introduced *** simulation results show that the secondary coordinated voltage control based on multi-objective programming can be used to solve distributed network voltage stability,but also can improve the efficiency of ADN.

关键词： Active distribution network Secondary voltage control Multi-objective linear programming

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High accurate estimation method of sub-synchronous oscillation parameters on PMU

High accurate estimation method of sub-synchronous oscillati...

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“紫金论电”2017智能电网保护和运行控制国际学术研讨会

作者： TAN Yong WANG Meng SHEN Jian ZHANG Min HOU Mingguo Nari Group Corporation(State Grid Electric Power Research Institute) Nanjing 21106China NARI Technology Development Co.Ltd Nanjing 211061China State Key Laboratory of Smart Grid Protection and Control Nanjing 210061China

With the rapid development of renewable energy power generations,AC/DC transmissions and static compensations etc,power electronic technology has been widely applied in power *** traditional power equipment is replaced by a large number of power electronic devices,the disturbances such as harmonic interference and sub-synchronous oscillation are more *** order to detect the sub synchronous oscillation in power system in time,and take measures to ensure the safety and stability of power system,this article analyses the algorithm principle of the PMU and the communication architecture of WAMS/PMU *** to the IEEE Std C37.118-2011 standard,it elaborates the problems and the limitations existing in the monitoring of sub-synchronous and super-synchronous harmonic parameters on *** the basis of the above,a method of on-line identification and alarm for the sub-synchronous and super-synchronous harmonic parameters on PMU device is *** with FFT spectrum correction theory,the high accuracy identification method of distributed sub synchronous and super synchronous harmonic parameter is *** feasibility and accuracy of the method is verified by simulation experiments.

关键词： sub-synchronous oscillation amplitude ratio method phasor measurement unit(PMU) FIR Filters

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Ultra-short-term wind speed forecasting method based on spatial and temporal correlation models

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The Journal of Engineering 2017年第13期2017卷 1071-1075页

作者： Zhou Haiqiang Xue Yusheng Guo Jizhu Chen Jiehui Energy and Electrical Engineering School Hohai University Nanjing 211100 Jiangsu Province People's Republic of China NARI Group Corporation (State Grid Electric Power Research Institute) Nanjing 211106 People's Republic of China State Key Laboratory of Smart Grid Protection and Control Nanjing 211106 People's Republic of China

An ultra-short-term wind speed forecasting method based on spatial and temporal correlation models is proposed. Firstly, the temporal correlation model was studied. The generalised distance of wind speed time series is defined based on the dynamic time warping distance and correlation coefficient. Samples with similar wind dynamic patterns are classed into the same group. Time series in one group are depicted with a representative time series which is modelled by an autoregressive moving average (ARMA) model. For time series which cannot be classed to any of these groups, a special group was defined. It was modelled by artificial neural network (ANN). Secondly, the spatial correlation between the target wind farm and the reference wind farm was investigated with the meteorological data taking into consideration. The grey prediction method is utilised to predict the wind speed. Finally, the combined ultra-short-term wind speed forecasting method is proposed. It takes into account the inherent time correlation of the target wind speed and its spatial correlation with reference wind farm. The wind speed prediction of wind farms in northwest USA verifies the effectiveness and feasibility of the proposed method.

关键词： wind neural nets time series grey systems autoregressive moving average processes wind power plants power engineering computing ultra-short-term wind speed forecasting method wind farms wind speed prediction target wind speed inherent time correlation ultra-short-term wind speed combination forecasting method corresponding spatial correlation model grey prediction method reference wind farm target wind farm ARMA model representative time series similar wind dynamic patterns sliding time window correlation coefficient dynamic time warping distance wind speed time series temporal correlation model temporal correlation models spatial correlation models

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Global Status Event-Based Iterative Co-Simulation Framework for Power and Communication

Global Status Event-Based Iterative Co-Simulation Framework ...

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IEEE Power and Energy Society General Meeting

作者： Heqin Tong Jianbo Luo Ming Ni Yuecen Li Yusheng Xue Yanhong Wei NARI Group Corporation NARI Technology Co. Ltd. State Key Laboratory of Smart Grid Protection and Control Nanjing China Sunshine Energy Property Management Group Inc. Xinyi China

ISBN: (纸本)9781538622131;9781538622124

Power system security and stability control is heavily dependent on the reliability of communication network. The communication interruption and latency may cause security and stability issues in power system. Thus, studying the dynamic procedure of the interaction between power system and communication network in fault situation becomes more and more important. In this paper, by analyzing the weakness of the existing co-simulation frameworks, a new co-simulation framework, Global Status Event-Based Iterative Co-simulation Framework, is proposed, in which a global event scheduler manages the communication simulator and power simulator, and power simulator will run iterative simulation as a new event is identified and added to the global event scheduler. Then, a co-simulation platform based on the proposed framework is introduced which integrates the power system simulator and communication network simulator. Finally, a case is studied and reveals the procedure of the cascading failures in both power system and communication network, which cannot be captured by the simulation of a single system.

关键词： Indexes Synchronization

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

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

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“紫金论电”2017智能电网保护和运行控制国际学术研讨会

作者： Shan Xin Li Jun Xu Xi Lu Jinjun NARI Group Corporation(State Grid Electric Power Research Institute) NanjingJiangsu Province211000China NARI Technology Co. Ltd.NanjingJiangsu Province211000China State Key Laboratory of Smart Gird Protection and Control NanjingJiangsu Province211000China

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 *** existing monitoring and control model based on the system model data cannot meet the requirements for the development of UHV power *** 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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High-accurate estimation method of sub-synchronous and super-synchronous harmonic parameters on PMU

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The Journal of Engineering 2017年第13期2017卷 1275-1279页

作者： Yong Tan Rong Chen Meng Wang Min Zhang Mingguo Hou Nari Group Corporation (State Grid Electric Power Research Institute) Nanjing 21106 People's Republic of China NARI Technology Development Co. Ltd Nanjing 211061 People's Republic of China State Key Laboratory of Smart Grid Protection and Control Nanjing 210061 People's Republic of China School of Rail Transportation Soochow University Suzhou 215131 People's Republic of China

With the rapid development of renewable energy power generations, AC/DC transmissions and static compensations etc., power electronic technology has been widely applied in power system. As traditional power equipment is replaced by a large number of power electronic devices, the disturbances such as harmonic interference and sub-synchronous oscillation are more frequently. In order to detect the sub-synchronous oscillation in power system in time, and take measures to ensure the safety and stability of power system, this article analyses the algorithm principle of the phasor measurement unit (PMU) and the communication architecture of wide area measurement system (WAMS)/PMU system. According to the IEEE Std C37.118-2011 standard, it elaborates the problems and the limitations existing in the monitoring of sub-synchronous and super-synchronous harmonic parameters on WAMS. On the basis of the above, a method of online identification and alarm for the sub-synchronous and super-synchronous harmonic parameters on PMU device is proposed. Combined with the fast Fourier transform spectrum correction theory, the high-accuracy identification method of distributed sub-synchronous and super-synchronous harmonic parameter is realised. The feasibility and accuracy of the method is verified by simulation experiments.

关键词： phasor measurement fast Fourier transforms power electronics IEEE standards power system harmonics electrical safety power system parameter estimation power system stability distributed sub-synchronous harmonic parameter fast Fourier transform spectrum correction theory online alarm online parameter identification IEEE Std C37.118-2011 standard WAMS-PMU system communication architecture phasor measurement unit power system safety wide area measurement system power system stability high-accurate estimation method super-synchronous harmonic parameter sub-synchronous oscillation power electronic devices

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