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IEEE International Conference on Networking, Sensing and control

作者： Xiaopeng Lin Peng Li Jian Ma Yi Tian Dawei Su State Key Laboratory of Alternate Electrical Power System Renewable Energy Sources (North China Electric Power University) Baoding China Jiangsu Electric Power Company Research Institute Jiangsu China Jiangsu Electric Power Company Dispatching and Control Center Jiangsu China

ISBN: (纸本)9781479980703

Combined heating and power (CHP) microgrid is conducive to the realization of energy cascade utilization and meeti the users' needs with divers types of energy. With remarkable economic and environmental benefits, CHP microgrid is one of the potential development directions of smart grid. In this paper, a CHP microgrid consists of wind turbines, photovoltaic cells, microturbines, gas-fired boilers, storage batteries, heat load and electric load was selected as research object. In order to evaluate the impact of CO 2 , CO, NO x emission on environment, the conception of gas emission plenty cost was quoted. In consideration of the stochastic nature of renewable energy units and the fluctuation of heat load and electric load, chance constrained programing was introduced to build the model, then Monte Carlo simulation based leapfrog firefly algorithm was proposed to solve the optimization model. The simulation results verified the reasonableness and effectiveness of the model and algorithm proposed.

关键词： Microgrids Cogeneration Resistance heating Load modeling Heuristic algorithms Optimization

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An Improved OPA Model in power system Considering Planning 33

An Improved OPA Model in Power System Considering Planning

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第三十三届中国控制会议

作者： GONG Yuan MEI Shengwei PENG Dong LONG Wangcheng GUO Mingxing Power Systems and Power Generation Equipment Control and Simulation National Key Laboratory Department of Electrical Engineering Tsinghua University State Power Economic Research Institute

ISBN: (纸本)9781479947249

The power system now is a typical complex system, which has inherent characteristics of SOC. Studying on cascading failures are necessary and meaningful to insure the grid's safety, national security and economic development. This paper firstly establishes the indices of power system development diagnosis, which are closely relevant to the trigger of power system evolution. Then a cascading failure model is proposed, considering planning and evolution of the power system. This model is based on OPA model, including both fast dynamics and slow dynamics. The slow dynamic process simulates the evolution of power system, which represents the functions of the planning department, while the fast dynamic process simulates power flow and cascading failures, which takes the effects of dispatch, relay protection and automation into consideration. Moreover, simulations are tested on the case of Kaifeng-Shangqiu power system in Henan Province of China, and evolution results are presented.

关键词： power system evolution,cascading failure,power system diagnosis,power grid complexity,OPA model

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A general test scheme for electrical measurement and control unit and its application

A general test scheme for electrical measurement and control...

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International Conference on Electric Utility Deregulation and Restructuring and power Technologies (DRPT)

作者： Fei Wang Kui Wang Rui Wang Yuanyuan Geng Jing Xiao Key Laboratory of Power System Intelligent Dispatch and Control (Shandong University) Ministry of Education Shandong University Jinan Shandong Province China State Grid Shandong Electric Power Company Maintenance Company Jinan Shandong Province China

ISBN: (纸本)9781467371070

To improve the generality and flexibility of test scheme, a general digital and analog mixed test scheme, which is based on a computerized model and signal generator has been designed in this paper, the test scheme applies simulation software to produce any kind of digital test signal, which is then transferred to analog signal by signal generator to meet input requirements of the device under test. The measurement value of device under test can be compared with original input value to analyze the measurement precision under all conditions. A test example for PMU Light is given to describe the test process, and the test result shows that the test scheme proposed in this paper can produce any kinds of test signals, it is a general and flexible test means for electrical measurement and control unit with high accuracy.

关键词： Phasor measurement units power industry Decision support systems Measurement units Production Transforms

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Longitudinal moment Markov chain model of wind power and its application on ultra-short-term prediction

Longitudinal moment Markov chain model of wind power and its...

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International Conference on Electric Utility Deregulation and Restructuring and power Technologies (DRPT)

作者： Jingwen Sun Zhihao Yun Jun Liang Xiaojuan Yang Libin Yang Xueli Wang Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Jinan China School of Communication Shandong Normal University Jinan China State Grid Qing Hai Electric Power Research Institute Qinghai China State Grid Shandong Electric Power Maintenance Company Jinan China

ISBN: (纸本)9781467371070

In this paper, a longitudinal moment Markov chain model of wind power time series based on the longitudinal time concept is proposed. This model emphasizes the transition characteristics related to different moments by providing a set of transition probabilities matrices. This matrices set, describing the inherent transition information of moments, gives the necessary probabilistic conditions for optimization decision of power systems containing wind farm. Besides of rapid calculation as conventional Markov chain model has, the proposed model makes the transition information more detailed and accurate. To illustrate the effect of improvement, a wind power prediction (WPP) method on ultra-short-term horizon using the longitudinal moment Markov chain model is put forward. The case study based on actual wind power data under multiple time scales shows that the proposed method achieves a higher prediction precision.

关键词： Markov processes Wind power generation Predictive models Data models power systems Time series analysis Wind farms

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Short-circuit Field Tests of Shandong Rongcheng Wind Farms and Measured Data Analysis

Short-circuit Field Tests of Shandong Rongcheng Wind Farms a...

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International Conference on Fuzzy systems and Knowledge Discovery

作者： Chunyi Wang Xiuqing Yi Zenggong Cao Hong Mu Hongtao Wang State Grid Shandong Electric Power Company Institute of Technology Shandong University of Traditional Chinese Medicine Jinan Shandong Province China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan 250061 Shandong Province China

ISBN: (纸本)9781467376839

In order to verify the short-circuit current characteristics of wind farms and the effects on power grids due to the large scale wind farms integration at Rongcheng substation, Shandong Electric power Company organized the three phase and single phase short circuit tests on Jun 12~(th), 2014. By using the field tests data got from the digital fault recorder, the short-circuit current characteristics of different types of wind turbines are compared. The wind turbine's contributions of the Squirrel Cage Induction Generator (SCIG), Doubly Fed Induction Generator (DFIG) and Permanent Magnet Synchronous Generator (PMSG) to the system short-circuit current are analyzed in detail. In addition, the short-circuit current characteristics of wind farms are summarized and deeply understood from the field tests data. With the analysis results, the Shandong Rongcheng wind farms short-circuit field tests will have a very good reference and directive significance to the large scale wind power centralized integration of the actual power grids.

关键词： wind turbine wind farm short-circuit tests short-circuit current characteristics

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Optimal reactive power compensation configuration in distribution power system integrated with small hydro power plant

Optimal reactive power compensation configuration in distrib...

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3rd International Conference on Energy and Environmental Protection, ICEEP 2014

作者： Ma, Hong Liang Ren, Zheng Mou Lu, Wen Xin Han, Yu Xin Wang, Zhao Jian Chen, Lai Jun Shaanxi Regional Electric Power Group Co. Ltd Xi'an 710061 China State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering Tsinghua University 100084 Beijing China

ISBN: (纸本)9783038351368

Hydropower is the most widely used renewable energy for electricity generation in China, and small hydro power plant (SHPP) is a flexible way of electricity generation in water-rich remote area. Voltage at the end of distribution network may be increased over the acceptable range due to the connection of SHPPs. Magnetic control reactor (MCR) is usually used to reduce the voltage by consuming reactive power. A mathematical model for calculation of the optimal capacity of MCR is proposed in this paper, and particle swarm optimization (PSO) is adopted to solve the optimization problem. Two cases based on the IEEE 33-bus test system are used to validate the proposed method. In the given cases, system voltage is adjusted to the acceptable range. © (2014) Trans Tech Publications, Switzerland.

关键词： Reactive power

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Failure analysis of fan mill in thermal power plant 68

Failure analysis of fan mill in thermal power plant

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68th Society for Machinery Failure Prevention Technology Conference: Technology Solutions for Affordable Sustainment, MFPT 2014

作者： Liu, Chao Jiang, Dongxiang Chu, Fulei Department of Mechanical Engineering Tsinghua University Beijing100084 China State Key Laboratory of Control and Simulation of Power System and Generation Equipments Department of Thermal Engineering Tsinghua University Beijing100084 China

Fan mill is an important device in thermal plants, which supply coal power to boiler. Crack failures recently occurred in pulverizing wheels of fan mills in a power plant in China. The cracks happens in quite a few pulverizing wheels and they affect the normal operation. To find out the root cause of the cracks, Finite Element Analysis (FEA) of the pulverizing wheel is carried out in this work. The assembly with real dimensions is modelled to calculate the concentrated stress and strain with centrifugal load, driving load, and operational temperature taken into account. Contact effects are included in the finite element model as well as nonlinear material property. Based on the analysis, the crack causes are determined: (i) the initial stress exceeds the yield limit in normal operational condition, resulting low safety coefficient;(ii) the stress increases significantly in the worn pulverizing wheel, where the risk of failure is greatly increased.

关键词： Cracks

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control of hybrid AC/DC microgrid under islanding operational conditions

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Journal of Modern power systems and Clean Energy 2014年第3期2卷 223-232页

作者： Guangqian DING Feng GAO Song ZHANG Poh Chiang LOH Frede BLAABJERG Key Laboratory of Power System Intelligent Dispatch and Control(Shandong University) Ministry of EducationJinan 250061China State Grid of China Technology College JinanChina Department of Energy Technology Aalborg UniversityAalborgDenmark

This paper presents control methods for hybrid AC/DC microgrid under islanding operation *** control schemes for AC sub-microgrid and DC sub-microgrid are investigated according to the power sharing requirement and operational *** addition,the key control schemes of interlinking converter with DC-link capacitor or energy storage,which will devote to the proper power sharing between AC and DC sub-microgrids to maintain AC and DC side voltage stable,is *** the specific control methods developed for AC and DC sub-microgrids with interlinking converter,the whole hybrid AC/DC microgrid can manage the power flow transferred between sub-microgrids for improving on the operational quality and efficiency.

关键词： Microgrid Islanding operation Distributed generation Hybrid AC/DC microgrid Inverter power flow

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Design of grounding system for wind-photovoltaic-energy storage Hybrid power station 4

Design of grounding system for wind-photovoltaic-energy stor...

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2014 4th International Conference on High Voltage Engineering and Application, ICHVE 2014

作者： Lin, Cheng Sen, Wang Zhizhong, Li Jing, Wang Bo, Zhang Weidong, Shi Power Grid Grounding Engineering Laboratory of State Grid Corporation of China Xi'an Shaanxi710049 China State Key Laboratory of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing100084 China China Electric Power Research Institute Beijing100192 China

ISBN: (纸本)9781479966134

Based on the Chinese demonstration project of Zhangbei wind-photovoltaic-energy storage (W-PV-ES) hybrid generation, which is the world's biggest and Chinese first new energy utilization platform, the design of grounding system for W-PV-ES Hybrid power station was studied in this paper. Firstly according to the soil resistivity of that power station, measured by the Wenner four-electrode method, the soil constitution, that is three-level layer in summer and is four-level layer including an 1.5m high and 2000·m permafrost in winter, was got, and grounding grid models of W-PV-ES hybrid generation was studied. Then grounding system of that W-PV-ES station was designed, that was the single wind turbine uses concentric bicyclic earth electrode, whose radius are 7m and 10m, and the PV-ES power station uses one horizontal earth electrode every 10m in one direction, every 50m in another direction, and there are 2.5m long vertical grounding rods every 10m around the PV-ES station. For the substation, we adopt the horizontal grounding grid with a 10m interval between conductors and 0.8m burial depth. On the condition that earth current is 10KA, the earth's surface potential, contact potential, and step potential were simulated. After that safety of 35kV system and secondary system were analyzed, when there was short trouble. Finally influence on earth resistance by different grounding materials was studied, galvanized flat steel and copper material was presented as two kinds of selection schemes of grounding materials for considering economic considerations. © 2014 IEEE.

关键词： Energy storage

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Consistency analysis of DFIG wind generation models in PSS/E and PSASP

Consistency analysis of DFIG wind generation models in PSS/E...

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International Conference on Electric Utility Deregulation and Restructuring and power Technologies (DRPT)

作者： Tao Fu Hengxu Zhang Changgang Li Qingwen Xu Xiaoming Liu Ji Zhang Chao Qi Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education School of Electrical Engineering of Shandong University Jinan China School of Electrical and Electronic Engineering Shandong University of Technology Zibo China Economic&Technology Research Institute State Grid Shandong Electric Power Company Jinan China

ISBN: (纸本)9781467371070

With rapid increase of wind power installed capacity, the operation mode of power system has changed greatly, it is necessary to include modeling and simulation based on wind turbines and farms. Numerical simulation plays a unique role in power system operation and control, and its accuracy turns out to be the focus of electric industry. PSASP and PSS/E, as two main sorts of simulation analysis software at home and abroad respectively, both enable wind turbines electromechanical transient simulation. In this paper, Detailed comparisons are made between Doubly-fed induction generator (DFIG) in PSS/E and PSASP. Finally, simulative results of power system including the models are compared and analyzed.

关键词： control systems power industry Numerical simulation Induction generators Numerical models Frequency conversion

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