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Secondary voltage control considering rapid dynamic reactive power compensation

Dianli Xitong Zidonghua/Automation of Electric power systems 2015年第2期39卷 53-60页

作者： Wang, Xuran Guo, Qinglai Sun, Hongbin Wang, Bin Zhang, Mingye Zhang, Boming Department of Electrical Engineering Tsinghua University Beijing100084 China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Tsinghua University Beijing100084 China

This paper presents a secondary voltage control system considering rapid dynamic var compensators, such as static var compensator/static synchronous compensator (SVC/STATCOM). In order to take full advantage of the rapid adjustment feature of SVC/STATCOM in static voltage control and transient voltage stability, two independent control stages are dealt with. In the first stage, SVC/STATCOM and conventional var compensators are incorporated in the coordinate secondary voltage control model to bring the rapid adjustment feature of SVC/STATCOM into full play. In the second stage, a quadratic programming model is designed to do the optimal control of the dynamic reactive power reserves. The reactive power compensation of the slow dynamic var compensators is substituted for that of SVC/STATCOM, and the dynamic reactive power reserves level is improved. Through coordination between sequence and space, all kinds of reactive power compensators are made full use of in the secondary voltage control and transient voltage stability prevention control. Nordic system test results show that the system can greatly improve the response speed of traditional secondary voltage control while avoiding the conflict between SVC/STATCOM and the traditional reactive power compensators. At the same time, the system is able to carry out effective preventive control of transient voltage stability and improve the recovery effect of system voltage after the disturbance. ©, 2015 State Grid Electric power Research Institute Press.

关键词： Reactive power

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Operation optimization of integrated power and heat energy systems and the benefit on wind power accommodation considering heating network constraints

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2015年第14期35卷 3596-3604页

作者： Gu, Zepeng Kang, Chongqing Chen, Xinyu Bai, Jianhua Cheng, Lu State Key Lab of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Haidian District Beijing100084 China State Grid Energy Research Institute Changping District Beijing102209 China

With the continuous growth of the installed capacity of wind power in China, the ability of integrating wind power becomes the bottleneck of its development. The electricity generation is determined by the heat supply in the heating period, so that the peak shaving capacity of the combined heat and power (CHP) units is limited by the heat demand, which restricts the wind power integration. Breaking this traditional operation mechanism and interacting the power system with the heating system is the key to alleviate the problem of wind power curtailment. This paper considered the heating network constraints and built up the model of the heating network which could be used in integrated energy systems. Based on it, an operation optimization model of the integrated power and heat energy systems which considered the heating network constraints and thermal unit commitment was proposed. Using this model, this paper proved that coordination the power system with the heating system could play an active role in the promotion of wind power integration. Besides, the impacts of the transmission capacity, the transmission delay and the transmission loss of the heating network were analyzed. © 2015 Chinese Society for Electrical Engineering.

关键词： Wind power

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Design and engineering application of automatic discovery system for critical flowgates and security operation rules in power grids

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Dianli Xitong Zidonghua/Automation of Electric power systems 2015年第1期39卷 117-123页

作者： Zhao, Feng Sun, Hongbin Huang, Tianen Guo, Qinglai Wu, Wenchuan Wen, Bojian Department of Electrical Engineering Tsinghua University Beijing100084 China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Tsinghua University Beijing100084 China Guangdong Power Grid Power Dispatching Control Center Guangzhou510600 China

The framework of an automatic discovery system for critical flowgates and security operation rules in the power grid is designed. Based on the real-time operation data of the power grid, the system is able to automatically find the critical flowgates adapted to the online operation state of the grid. By using the automatic learning method, the system can find the fine rules of critical flowgates as the security operation knowledge of the grid. The functions of the core modules of the system are described, including online automatic discovery of critical flowgates, online calculation of limit transmission capacity of critical flowgates, online generation of mass simulation samples, feature selection, automatic discovery of security operation rules of the power grid. The online application of the system has been realized in Guangdong power grid. The application effect shows that the system is able to generate the security operation knowledge fast enough and refresh it every 15 minutes for online application as required. Meanwhile, the knowledge is capable of not only covering the existing security operation knowledge formulated by experts offline, but also finding new knowledge adapted to the online power grid operation mode, while improving the power grid security and economy.

关键词： Electric power transmission networks

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Short-term prediction model of module temperature for photovoltaic power forcasting based on support vector machine

Short-term prediction model of module temperature for photov...

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International Conference on Renewable power generation, RPG 2015

作者： Sun, Yujing Wang, Fei Mi, Zengaiang Sun, Hongbin Liu, Chun Wang, Bo Lu, Jing Zhen, Zhao Li, Kangping State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Baoding Hebei Province071003 China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Haidian District Beijing100084 China China Electric Power Research Institute Haidian District Beijing100192 China

ISBN: (纸本)9781785610400

To improve the prediction accuracy of photovoltaic (PV) power generation, the temperature of PV modules and its prediction is very important. A short-term step-wise temperature prediction model for PV module based on Support Vector Machine (SVM) is proposed in this paper. Firstly, the primary impact factors of PV module temperature are determined in terms of the PV module physical characteristics and the correlation coefficient between each factor and module temperature. Secondly, two kinds of prediction models, direct and step-wise models, are built to predict module temperature respectively. For direct model, the prediction model is based on SVM using the historical data. For step-wise one, the prediction models of the primary impact factors are built at the first step and then the mapping models between module temperature and the impact factors are established. In the end, the deviations of two different kinds of prediction models are analyzed and discussed based on actual operation data. The results indicate that the stepwise prediction model has better accuracy than the direct prediction model if other things are equal.

关键词： Forecasting

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Photovoltaic plant Operating Statuses Identification model based on support vector machine using loss quantity of electricity feature parameters

Photovoltaic plant Operating Statuses Identification model b...

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International Conference on Renewable power generation, RPG 2015

作者： Li, Kangping Wang, Fei Zhen, Zhao Sun, Yujing Mi, Zengqiang Sun, Hongbin Liu, Chun Wang, Bo Lu, Jing State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Baoding Hebei Province071003 China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Haidian District Beijing100084 China China Electric Power Research Institute Haidian District Beijing100192 China

ISBN: (纸本)9781785610400

Operating Statuses Identification (OSI) can help operators to find fault timely and minimize the loss. So it is of great significance for optimal operation of photovoltaic (PV) plants. The loss quantity of electricity (LQOE) is defined as that should have been generated but actually not, which is caused by inverter fault, PV modules fault, dust stratification or combinations of them. Firstly, mathematical models of PV cells are proposed to figure out the LQOE of each PV module. Secondly, after analysing the relation between LQOE and operating statuses, an index set of LQOE describing the distinction of different operating statuses are defined including four statistical feature parameters and a user-defined index. Thirdly, Support Vector Classification models for OSI (OSI-SVC) are built with input features extracted from the index set. Lastly, simulations are carried out to verify the effectiveness and evaluate the performance of the OSI-SVC models. The results indicated that the operating statuses can be effectively recognized by the proposed model.

关键词： Support vector machines

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Cloud identification model for sky images based on Otsu

Cloud identification model for sky images based on Otsu

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International Conference on Renewable power generation, RPG 2015

作者： Li, Hongping Wang, Fei Ren, Hui Sun, Hongbin Liu, Chun Wang, Bo Lu, Jing Zhen, Zhao State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Baoding Hebei Province071003 China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Haidian District Beijing100084 China China Electric Power Research Institute Haidian District Beijing100192 China

ISBN: (纸本)9781785610400

Irradiance changes caused by clouds movement are the mam factors, which lead to mutation of photovoltaic power. In order to increase the accuracy of the ultra-short-term photovoltaic power prediction, based on of clouds images, the cloud identification for sky images is one of the primary aspects for improving photovoltaic power accuracy. A cloud identification model for sky images is established based on Otsu. Firstly, a series of sky images are collected by Total Sky Imager (TSI) with the regions of clouds and sky are distinguished. Secondly, the color features (based on RGB values) of pixels in sample images and the spectral and texture features of the whole image are extracted;Finally, we established a cloud identification model for sky images based on Otsu according to the clouds' and sky areas' division and the general characteristics featured by pixels and images. The simulated results show that the model in this paper can identify the clouds in a sky images effectively.

关键词： Pixels

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Real-time economic dispatch model with prohibited zones considering maximum wind power injection

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2015年第4期35卷 759-765页

作者： Ding, Tao Sun, Hongbin Bo, Rui Yao, Zhengyi State Key Lab of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Haidian District Beijing100084 China Midwest ISO Street Paul MN55108 United States Baoji Power Supply Bureau BaojiShaanxi Province721004 China

Due to the physical limitations of the generator, the vibrations in a shaft bearing may be amplified at a certain operation regimes, the prohibited zones are needed which leads to a disjoint power generation instead of continuous output. Besides, the reservation for each generator should also be considered to face with the stochastic integrated generation of large-scale wind power into power grid, which actually reduces the total reservation of the grid. Therefore, the economic dispatch with the multiple objective of minimized cost and maximized wind power integration, as well as the prohibited zones, was set up, and a standard mixed integer quadratic programming was formulated. Furthermore, the test system with six, fifteen and multiple generators were simulated respectively. The results show that the proposed method can be applied to the real-time system. ©2015 Chin. Soc. for Elec. Eng.

关键词： Real time systems

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Fault Line Identification of Single Line to Ground Fault for Non-Effectively Grounded Distribution Networks with Double-Circuit Lines

Fault Line Identification of Single Line to Ground Fault for...

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IEEE power and Energy Society General Meeting

作者： Bo Jiang Xinzhou Dong Shenxing Shi Bin Wang State Key Lab. Of Control and Simulation of Power System and Generation Equipment Dept. of Electrical Engineering Tsinghua University Beijing 100084 China

ISBN: (纸本)9781467380416

Single Line to Ground (SLG) faults in non-effectively grounded networks are difficult to detect. Immune to neutral point grounding type, load conditions and system operation conditions, traveling-wave based method is an effective fault line identification method. However, due to the strong coupling between the double-circuit lines, the wavefront magnitude of them are the same, and the polarity of them are opposite. Thus, the mal-identification will be resulted under such condition. This paper analyzed the traveling wave characteristics of double-circuit lines, and proposed an improved fault line identification method based on the initial process of zero sequence currents and voltage traveling waves. Tests show that, the proposed method has high effectiveness in fault line identification of double-circuit lines in distribution networks.

关键词： distribution networks double-circuit fault line identification non-effectively grounded traveling wave Double circuit power grids line down Earth faults traveling waves single line

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Transmission expansion planning modelfacilitating low-carbon power sources' development

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Dianwang Jishu/power System Technology 2015年第10期39卷 2725-2730页

作者： Du, Ershun Sun, Yanlong Zhang, Ning Chen, Songsong He, Guixiong Kang, Chongqing State Key Lab of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing100084 China China Electric Power Research Institute Haidian District Beijing100192 China

power planning oriented to low-carbon can relief 'carbon lock' effect and facilitate to achieve low-carbon power system. For tapping low-carbon potential of power grid, this paper comprehensively analyzes corresponding low-carbon elements and proposes a novel transmission planning model for promoting low-carbon power sources' development. These analyses include facilitation of integration and accommodation of renewable power, life cycle carbon emission process and reduction of grid loss. Based on multi-scenario technique, the proposed model minutely simulates system operation process considering both typical and extreme operation constrains. Through inequality separation and piecewise linearization, original model is converted into a large scale mixed integer linear programming (MILP) model. Case study of Jiangsu provincial grid verifies validity of the proposed model. ©, 2015, power System Technology Press. All right reserved.

关键词： Life cycle

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Method of coordination among strongly coupled power plants for automatic voltage control

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Dianli Xitong Zidonghua/Automation of Electric power systems 2015年第12期39卷 165-171页

作者： Wang, Bin Guo, Qinglai Sun, Hongbin Tang, Lei Zhang, Boming Tian, Junjie Department of Electrical Engineering Tsinghua University Beijing100084 China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Tsinghua University Beijing100084 China Dispatching and Communication Center of State Grid Shanxi Electric Power Corporation Taiyuan030001 China

To solve the problem of reactive power non-coordination among strongly coupled plants, a coordinating method for strongly coupled plants for automatic voltage control (AVC) is proposed. The coupling coefficient among plants is introduced, and the plant coordinating group is generated as the coordinating unit. The reactive power unbalanced index among strongly coupled plants is defined. And the current operation state of power grid is determined. In the event the pilot bus voltage is not controlled in place, the control strategy of voltage regulation and reactive power tracking control is adopted so that the pilot bus voltage will be enabled to guarantee that the reactive power unbalanced index between strongly coupled plants will meet the control requirement while tracking optimal settings. If the pilot bus voltage is already in place, reactive correction control based on the objective of plant-to-plant coordination will be carried out to reduce the deviation in reactive load while ensuring that the pilot bus voltage is maintained within the range of control dead zone. Reactive regulating commands will be added to the traditional voltage regulating commands to suppress possible irrational reactive power distribution or reactive fluctuation between strongly coupled plants. Application of the proposed method in a number of regional and provincial grids in China shows that the proposed method is able to reduce irrational reactive power distribution between strongly coupled plants. © 2015 State Grid Electric power Research Institute Press.

关键词： Reactive power

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