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作者： Guo, Shan Shan Dong, Ze Hebei Engineering Research Center of Simulation and Optimized Control for Power Generation North China Electric Power University Baoding China

ISBN: (纸本)9783038351382

The paper studies on wet flue gas desulfurization process and the factors of affecting the desulfurization efficiency, and analyses the control system of the absorber slurry pH value. The conventional PID control is difficult to achieve satisfactory control effect, so it puts forward the predictive control scheme based on Dynamic Matrix control (DMC) algorithm to identify and control the change of pH value. simulation results show that under the control of DMC algorithm, the slurry pH value has a good tracking for setting input and its changes, reflecting a high degree of adaptability. The control with low overshoot and good accuracy is better than conventional PID control and meets the requirements of real-time control. © (2014) Trans Tech Publications, Switzerland.

关键词： Three term control systems

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research on a new feedforward controller of main steam temperature system

Research on a new feedforward controller of main steam tempe...

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2014 IEEE International Conference on Information and Automation, ICIA 2014

作者： Fei, Deng Yongjie, Zhai Hebei Engineering Research Center of Simulation and Optimized Control for Power Generation North China Electric Power University Hebei Province Baoding China

ISBN: (纸本)9781479941001

Main steam temperature is an important parameter in thermal system of the coal-fired power unit, whose control quality directly affects the safety and efficiency of the whole thermal power unit. It has large time delay, big inertia, time varying and nonlinear characteristics which make it difficult to get effect perfectly. This paper uses principle component analysis to ensure the main variables of effective the main steam temperature, then considers the relationship among these variables and the impact characteristics, to designed a novel feedforward control strategy combine SVM and conventional PID. Through the simulation of this control method and analysis on the control quality, the result shows that this control method has feasibility and better control effect which overcomes the effect of the load disturbance big range ability and frequent to main steam temperature.

关键词： Abstracts Automation Conferences Decision support systems Feedforward neural networks Indexes Support vector machines SVM feedforward control main steam temperature principle component analysis

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The design of emergency management system for thermal power plant based on B/S architecture

The design of emergency management system for thermal power ...

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2014 International Conference on Energy research and power engineering, ERPE 2014

作者： Zhang, Li Fang Sun, Hai Rong Jia, Hao Dong, Ze Hebei Engineering Research Center of Simulation and Optimized Control for Power Generation North China Electric Power University Baoding 071003 China

ISBN: (纸本)9783038351603

The thermal power has a large proportion in China's energy structure, thus, the thermal power plants can be said to be the foundation of our national economy. However, the industry characteristics of thermal power plant themselves make it to be accident-prone. In this paper, we aim at the suddenness and rapidity of emergency, combine the principle of "both prevention and response, combined with the normal and abnormal", relay on the B/S architecture, run through the four stages of emergency management which are prevention, preparedness, response and recovery, in order to propose the overall design scheme of emergency management system for thermal power plant. © (2014) Trans Tech Publications, Switzerland.

关键词： Risk management

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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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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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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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Physical parameters consistency based 3D temperature field reconstruction for combustion flame

Physical parameters consistency based 3D temperature field r...

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2014 International Conference on Energy research and power engineering, ERPE 2014

作者： Wang, Xu Guang Zhang, Hai Peng School of Control and Computer Engineering North China Electric Power University Baoding 071003 China Hebei Engineering Research Center of Simulation and Optimized Control for Power Generation Baoding 071003 China

ISBN: (纸本)9783038351603

We present a novel solution to accurately recover 3D dynamic flame temperature field based on physical parameters consistency. First, a new optical model is proposed to establish the relationship between the flame radiation and the radiance field, this model fully considers refractive effect caused by refraction index changing;Second, high dynamic range (HDR) cameras are used to take flame images, a lookup table is employed calculate temperature from radiance;Third, an algorithm is put forward to reconstruct the flame temperature field. Experimental results on real flame accord with physical facts, which demonstrate that our solution is validate. © (2014) Trans Tech Publications, Switzerland.

关键词： Table lookup

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research on simulation and scheme of the double reheat steam temperature control system

Research on simulation and scheme of the double reheat steam...

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2013 International Conference on Future Energy, Environment, and Materials, FEEM 2013

作者： Dong, Ze Chai, Jialin Sun, Ming Wang, Dongfeng Wan, Hui Hebei Engineering Research Center of Simulation and Optimized Control for Power Generation North China Electric Power University Baoding China Guodian Science and Technology Research Institute Nanjing China

ISBN: (纸本)9781845648572

The secondary reheat steam temperature system was designed and researched for the double reheat power unit. A simulator adopting modular modelling is chosen as the research platform to construct an ultra-supercritical double reheat unit. According to the analysis of the double reheat thermal system, the double reheat steam temperature control system is designed. The main control approach is surface type attemperator, which adopts cascade control loop and affiliates with spray type attemperator. After adding mathematical model of the second reheat steam temperature system into LN algorithm library, the system model is set up. According to the simulation results, the feasibility, advantages, and disadvantages of the surface type attemperator control is analyzed. © 2014 WIT Press.

关键词： Temperature control

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Smart substation advanced application software adapted for two-level distributed smart dispatch and control

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Dianli Xitong Zidonghua/Automation of Electric power Systems 2015年第1期39卷 233-240页

作者： Sun, Hongbin Mu, Jianan Sheng, Tongtian Li, Qingxin Wang, Jing Wang, Bin Wang, Xuran Ji, Guoqiang Wu, Wenchuan Guo, Qinglai Li, Yalou Wang, Dexing 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 China Electric Power Research Institute Beijing100192 China East China Electric Power Dispatching and Control Sub-Center of State Grid Shanghai200120 China

The development of smart grid has posed a challenge to the traditional centralized dispatch mode. The basic contradiction between distributed autonomy and centralized coordination is reexamined, and an architecture of smart substation advanced application software system is proposed, including such advanced applications as modeling, state estimation, intelligent alarming, voltage stability assessment and control, automatic voltage control, risk assessment modeling, etc. This facilitates a change from centralized dispatch and control mode to a more reliable, agile substation-control center two-level distributed smart dispatch and control mode. The features, functions and realization of the proposed advanced application software are described, some field engineering application cases demonstrated, and certain practical aspects of implementation discussed. Finally, the prospect for future development of the smart substation advanced application software is displayed.

关键词： State estimation

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Synchronization of uncertain fractional-order chaotic systems with disturbance based on a fractional terminal sliding mode controller

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Chinese Physics B 2013年第4期22卷 178-184页

作者：王东风张金营王晓燕 Hebei Engineering Research Center of Simulation & Optimized Control for Power Generation (North China Electric Power University)

This paper provides a novel method to synchronize uncertain fractional-order chaotic systems with external disturbance via fractional terminal sliding mode control. Based on Lyapunov stability theory, a new fractional-order switching manifold is proposed, and in order to ensure the occurrence of sliding motion in finite time, a corresponding sliding mode control law is designed. The proposed control scheme is applied to synchronize the fractional-order Lorenz chaotic system and fractional-order Chen chaotic system with uncertainty and external disturbance parameters. The simulation results show the applicability and efficiency of the proposed scheme.

关键词： fractional-order chaotic system synchronization terminal sliding mode control uncertainty disturbance

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