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2017 Chinese Automation Congress, CAC 2017

作者： Xiyun, Yang Dehua, Dong Xue, Ma Na, Geng Jianhua, Zhang School of Control and Computer Engineering North China Electric Power University Beijing China EPRI of Jilin Electric Power Co. Ltd. Jilin China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing China

ISBN: (纸本)9781538635247

With economic and industrial restructuring, the number and size of commercial parks are increasing. The most basic function of energy storage system in commercial parks is to carry out the load side, Which also brings economic benefits and ensures the reliability of power grid. Therefore, it is of practical significance to study the control strategy of energy storage system in business parks. In this paper, a variable parameter power difference control strategy for energy storage system is proposed. Based on the typical daily load of the park, it divides the load interval and the SOC of the energy storage system. Different subspaces are provided with different strategies. Finally, a simulation analysis, taking a Shanghai business park as an actual data sample shows that the proposed method for the energy storage system is effective. © 2017 IEEE.

关键词： Energy storage

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Maintenance Scheduling of power Equipment Considering Opportunistic Maintenance Strategy

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IOP Conference Series: Materials Science and Engineering 2019年第1期486卷

作者： Bo Xu Yumin Zhang Kongming Sun State Grid Energy Research Institute Co. Ltd. Beijing China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan 250061 Shandong Province China State Grid Shandong Electric Power Research Institute Jinan 250003 Shandong Province China

This paper investigates the impact of opportunistic maintenance strategy on power equipment maintenance scheduling under economic dependence. The model focuses on power equipment with two types of failures: random failure and deterioration failure. Unlike previous research which didn't consider opportunistic maintenance between different failures modes, opportunistic maintenance strategy is proposed in this paper. In the opportunistic maintenance strategy, whenever random failure occurs, decision has to be made on whether deterioration failure is preventively maintained based on the degree of equipment deterioration and economic dependence. Firstly, Markov process is used to describe equipment state-space diagram. And then, in order to determine the optimal inspection rate, preventive maintenance threshold and opportunistic maintenance threshold of power equipment, the analytical expressions of inspection cost, maintenance cost, repair cost and outage cost are quantified. Finally, the total cost is minimized to get the optimal maintenance strategy. Case studies demonstrate the feasibility of the proposed model.

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Hidden Failure Prognosis For Navigation Inertial Platform Using Belief Rule Base Expert system

Hidden Failure Prognosis For Navigation Inertial Platform Us...

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2017 9th International Conference on Modelling, Identification and control (ICMIC 2017)

作者： Run-Fan Han Gui-Ming Chen Tian-Jun Liao Xiao-Dong Ling Lei-Lei Chang the High-tech Institute of Xi’an the State Key Laboratory of Complex System Simulation Beijing Institute of System Engineering the China Satellite Maritime Tracking and Control Laboratory

The gyro drift is the main factor in affecting the performance of the inertial platform which is an important unit in the navigation *** belief rule base(BRB) is used to construct the failure prognosis model of the inertial platform which holds the following characteristics:(1) the storage lives are long and working lives are short,(2) a lot of testing data can not be obtained,(3) some expert knowledge may be available,and(4) the failure is *** order to solve the problems,two sub-BRBs are used with one employed to capture the relationship between the external stress and hidden failure and the other to construct the forecasting model of hidden *** experimental case study is examined to demonstrate the implementation and potential applications of the proposed failure prognosis model.

关键词： Belief rule base expert system hidden failure prognosis navigation inertial platform

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Economic Impacts of Wind and Solar Photovoltaic power Development in China

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Energy Procedia 2017年 105卷 3440-3448页

作者： Yanxia Li Wenjia Cai Can Wang Ministry of Education Key Laboratory for Earth System Modeling and Center for Earth System Science Tsinghua University Beijing China State Key Joint Laboratory of Environment Simulation and Pollution Control (SKLESPC) and School of Environment Tsinghua University Beijing China

Recently, wind and solar PV power industries have entered a stage of large-scale development in China. In this study, scenarios and an input-output model are built to assess the economic impacts of wind and solar PV power development in China from 2016-2030. Compared to the reference scenario, more added value is brought about in the development scenario while both scenarios generate the same amount of electricity. In the development scenario, the quantitative analysis implies that the added value brought about by wind and solar PV power industry, directly and directly, is about 5.0 times in 2030 more than that in 2015. During 2016-2030, about 8674 billion RMB (1300 billion dollars) and 6949 billion RMB (1042 billion dollars) added value could be generated respectively by wind power industry and solar PV power industry, accounting for about 0.58% and 0.47% of GDP. In addition, the main interdependent industries stimulated by wind power industry or solar PV power industry are different from those stimulated by coal-fired power industry.

关键词： economic impacts wind power industry solar PV power industry input-output model

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Modeling and simulation of DC micro-grid based on virtual motor control

Modeling and simulation of DC micro-grid based on virtual mo...

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2017 IEEE Transportation Electrification Conference and Expo, Asia-Pacific, ITEC Asia-Pacific 2017

作者： Yi, Wei Yi, Dawei Hu, Xiongwei Wang, Xiangnv Shi, Fang Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Shandong University 17923 Jingshi Road Jinan China National Joint Engineering Laboratory of Power Grid with Electric Vehicles 17923 Jingshi Road Jinan China State Grid Heilongjiang Power Corporation Harbin Electricity Power Supply Company 188 Shangzhi Road Harbin China

ISBN: (纸本)9781538628942

A flexible DC micro-grid model is proposed, which is suitable for grid-connected renewable energy and energy storage. The complete circuit topology and its corresponding control strategy are given, which can make sure energy reliability, and can automatically achieve a reasonable power distribution. In addition, based on the theory of Virtual Generator (VG), a complete control strategy of each interface is proposed, that is, the Virtual DC Generator (VDG) control strategy is adopted in the load and energy storage unit, and the Virtual Synchronous Generator (VSG) control strategy is adopted in the grid connection interface. VSG has the similar active and reactive power adjustment ability to the synchronous generator. The voltage amplitude and frequency of the grid- connected inverter are adjustable. It can simulate the inertia and damping characteristics of the synchronous generator, and overcome the impact of the traditional grid-connected inverter without inertia to the grid, which can effectively enhance the ability of the grid to accept renewable energy. What's more, the model of electric vehicles is considered into the micro-grid to meet the future trend of power grid. simulation and experimental results verify the validity and reliability of the proposed. © 2017 IEEE.

关键词： DC-DC converters

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Scatter factor confidence interval estimate of least square maximum entropy quantile function for small samples

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Chinese Journal of Aeronautics 2016年第5期29卷 1285-1293页

作者： Wu Fuxian Wen Weidong Jiangsu Province Key Laboratory of Aerospace Power System College of Energy and Power Engineering Nanjing University of Aeronautics and Astronautics State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics

Classic maximum entropy quantile function method （CMEQFM） based on the probability weighted moments （PWMs） can accurately estimate the quantile function of random variable on small samples, but inaccurately on the very small samples. To overcome this weakness, least square maximum entropy quantile function method （LSMEQFM） and that with constraint condition （LSMEQFMCC） are proposed. To improve the confidence level of quantile function estimation, scatter factor method is combined with maximum entropy method to estimate the confidence interval of quantile function. From the comparisons of these methods about two common probability distributions and one engineering application, it is showed that CMEQFM can estimate the quantile function accurately on the small samples but inaccurately on the very small samples （10 samples）; LSMEQFM and LSMEQFMCC can be successfully applied to the very small samples; with consideration of the constraint condition on quantile function, LSMEQFMCC is more stable and computationally accurate than LSMEQFM; scatter factor confidence interval estimation method based on LSMEQFM or LSMEQFMCC has good estimation accuracy on the confidence interval of quantile function, and that based on LSMEQFMCC is the most stable and accurate method on the very small samples （10 samples）.

关键词： Confidence intervals Maximum entropy Quantile function Reliability Scatter factor Small samples

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The design and simulation of the 3MW direct drive wind turbine's controller to decrease vibration of the tower 32

The design and simulation of the 3MW direct drive wind turbi...

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32nd Youth Academic Annual Conference of Chinese Association of Automation, YAC 2017

作者： Zhenghou, Yang Guoqiang, Zhang Yuan, Wen Ying, Deng Beijing Huaneng Xinrui Control Technology Co. Ltd. Beijing102209 China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of Renewable Energy North China Electric Power University Beijing102206 China

ISBN: (纸本)9781538629017

Because the environment that the wind turbine runs in is severe, the generating efficiency is low and the vibration of tower is very obvious. The consequence not only causes economic loss but also lead to the reduction of the wind turbine's lifetime. Basing on the traditional PI controlling system, this passage mainly studies to decrease the vibration of the tower by adjusting the controlling PI parameters and adding the tower damper. Establishing the wind turbine's linear, constant, SISO model, selecting the controlling parameters by MATLAB simulation at different isolate wind speed to achieve stable and fast controlling. At different isolate wind speeds, adding the tower damper to decrease the acceleration of tower. At last making global simulation with Bladed to verify and compare the traditional PI strategy with the new strategy. The result of the simulation with Bladed shows the strategy decreases the vibration of the tower and protect the wind turbine. © 2017 IEEE.

关键词： Towers

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Maximum production point tracking of a high-temperature power-to-gas system: A dynamic-model-based study

arXiv

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arXiv 2018年

作者： Xing, Xuetao Lin, Jin Song, Yonghua Hu, Qiang State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing100084 China Department of Electrical and Computer Engineering University of Macau China Department of Electrical Engineering Tsinghua University Beijing100084 China Tsinghua-Sichuan Energy Internet Research Institute Chengdu610213 China

power-to-gas (P2G) can be employed to balance renewable generation because of its feasibility to operate at fluctuating loading power. The fluctuating operation of low-temperature P2G loads can be achieved by controlling the electrolysis current alone. However, this method does not apply to high-temperature P2G (HT-P2G) technology with auxiliary parameters such as temperature and feed rates: Such parameters need simultaneous coordination with current due to their great impact on conversion efficiency. To improve the system performance of HT-P2G while tracking the dynamic power input, this paper proposes a maximum production point tracking (MPPT) strategy and coordinates the current, temperature and feed rates together. In addition, a comprehensive dynamic model of an HTP2G plant is established to test the performance of the proposed MPPT strategy, which is absent in previous studies that focused on steady states. The case study suggests that the MPPT operation responds to the external load command rapidly even though the internal transition and stabilization cost a few minutes. Moreover, the conversion efficiency and available loading capacity are both improved, which is definitely beneficial in the long run. Copyright © 2018, The Authors. All rights reserved.

关键词： Dynamic models

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Voltage balance optimisation among subsystems of wind-photovoltaic-ES hybrid generating system

Voltage balance optimisation among subsystems of wind-photov...

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6th International Conference on Renewable power Generation

作者： Wu, Han Li, Yan Lu, Zongxiang Tang, Haiyan State Key Lab of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing100084 China North China Electric Power Research Institute Co. Ltd Beijing100045 China State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems China Electric Power Research Institute Haidian District Beijing100192 China

Wind-photovoltaic-energy storage (ES) hybrid generating system has numerous reactive power sources. It is crucially important for coordinated control of these reactive power sources. According to the test results, there are unbalanced control problem in subsystem voltage of the hybrid generating system. The problem caused reactive power circulation and loop current. A subsystem voltage balance optimisation strategy is proposed to solve the problem. The case study shows the efficiency of the proposed strategies. © 2017 Institution of Engineering and Technology. All rights reserved.

关键词： Reactive power

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The optimal circuitous communication route search for pilot protection based on ant colony algorithm 13

The optimal circuitous communication route search for pilot ...

引用

13th International Conference on Development in power system Protection 2016, DPSP 2016

作者： Chen, Xin Bo, Zhiqian Dong, Xingzhou Shi, Shenxing Wang, Bin State Key Laboratory of Control and Simulation of Power System and Generation Equipments China Xuji Group Corporation China

ISBN: (纸本)9781785618260

With the development of smart grid, the self-healing ability of protection device becomes much more important. Pilot protection is of good selectivity, but it needs a highly reliable communication network. Once the communication line between two devices is out of work, pilot protection will be forced out of operation. Since there are many ring structures in communication network, circuitous routes can be found to help pilot protection remain operational. In this paper, ant colony algorithm (ACA) are used to find the optimal circuitous route, and simulation results show the method is fast and accurate. To the actual communication network of power system, each node is just connected to a few other nodes, so the search process often come to dead ends. Use penalty functions can reduce the probability of coming to a dead end and improve the algorithm efficiency. The whole route accelerating penalty function is most efficient.

关键词： Timing circuits

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