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IEEE Conference on Energy Internet and Energy System Integration

作者： Weihong Yang Lin Cheng Ning Qi Yanru Liu Xuyang Wang State Power Economic Research Institute State Grid Corporation of China Beijing China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Beijing China

With the rapid development of active distribution network and demand-side response, the effective utilization of large-scale flexible load is one of the main trends of the future distribution network development. In this paper, Energy Internet demonstration park has become the focus of international academy and industry. In this paper, shortcomings of the existing methods and new methods in load forecasting, power, and energy balance and planning evaluation are proposed, which emphasize mostly on the impact of flexible load on the distribution network. Then, the planning optimization method considering flexible load is discussed, and the relevant theoretical results are summarized from the aspect of uncertainty, multi-objective and multi-agent. Finally, the relevant technologies of future distribution network planning are prospected.

关键词： Distribution network planning Flexible load Active distribution network Planning method

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Generalized Variational Merging of Multi-source Precipitation Data Based on the Non-Gaussian Model

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Meteorological and Environmental Research 2017年第6期8卷 20-26页

作者： Jin Shuanglong Wang Gen State Key Laboratory of Operation and Control of Renewable Energy&Storage Systems China Electric Power Research InstituteBeijing 100192China Anhui Meteorological Information Centre Anhui Key Lab of Atmospheric Science and Satellite Remote SensingHefei 230031China The Institute of Atmospheric Environment China Meteorological AdministrationShenyang 110016China

Different from other domestic and foreign research in which the optimum interpolation(OI) merging algorithm is commonly used,this paper constructs the non-Gaussian model for generalized variational precipitation data merging research based on the non-Gaussianity of precipitation data. For CMORPH data correction,the probability density function( PDF) matching method is adopted,during which the GAMMA function fitting is utilized,and the generalized variational merging based on non-Gaussian model is used to merge corrected CMORPH precipitation data and station ground observation precipitation data. Meanwhile,we carry out an experiment on CMORPH precipitation data correction and the merging of multisource precipitation data based on non-Gaussian model. By measuring the structural similarity between the merged field and the reference field,we get a merging method that can better retain useful " outliers" which represent weather phenomena. The experimental results accord with our expectations.

关键词： CMORPH GAMMA function PDF corrections Non-Gaussian model Generalized variational merging

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Enhancing N-1 Security via Building Thermostatic Load control Strategy

Enhancing N-1 Security via Building Thermostatic Load Contro...

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International Conference on the European Energy Market

作者： Xin Jia Haiwang Zhong Qing Xia Molin Huo Xingyang Zhu Chongqing Kang Department of Electrical Engineering State Key Lab of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Beijing China State Grid (Suzhou) City & Energy Research Institute Jiangsu China

With the increase of distributed energy resources (DER), energy network's uncertainty is growing continuously, and grid operations is encountering severe challenges. Conventionally, the N-1 security criteria is satisfied mainly via adjusting generators' output. But in some cases, it is not effective because of the complex network constraints and the generators' limited dispatch range. With the development of smart buildings, there are lots of thermostatic controlled loads inside the buildings. The flexibility of building energy consumption is underutilized in the past. Therefore, a new method is proposed in this paper to enhance N-1 security via building thermostatic load control. A three-stage model is formulated. An energy-consumption simulation software termed EnergyPlus is utilized to calculate the relationship between indoor temperature settings and thermostatic loads of buildings. Case studies based on the modified IEEE-30 bus system with building thermostatic load validate the effectiveness of the proposed control method.

关键词： EnergyPlus N-1 security Smart building Thermostatic load Three-stage model

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Wide Area control Framework Design Considering Different Feedback Time Delays

Wide Area Control Framework Design Considering Different Fee...

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IEEE power and Energy Society General Meeting

作者： Gang Chen Yuanzhang Sun Vaithianathan "Mani" Venkatasubramanian Lin Cheng Jin Lin Anjan Bose Weixing Zhao Cheng Lin State Key Lab. of Power Systems Dept. of Electrical Engineering Tsinghua University Beijing 100084 China School of Electrical Engineering and Computer Science Washington State University Pullman WA 99164-2752 USA Guizhou Electric Power Grid Dispatching and Control Center Guiyang Guizhou 550002 China

ISBN: (纸本)9781467327275

In this paper, a framework for a real-time wide area controller is established for damping small-signal instability related events in interconnected power systems. Offline designing is performed to design the centralized controller for each inter-area mode of the power system. Residue approach is used to select the most effective stabilizing signals and controller locations. Different constant time delays are taken into controller parameters design. Thus an offline controller database is formed, including different controllers of each mode. The parameters of each controller are different for various ranges of time delay. The damping and other mode information will be identified by online multi-Prony analysis. When an inter-area mode is detected with weak or negative damping, say less than 3%, the corresponding controller for the detected mode will be initiated and deployed for enhancing the damping of the problematic mode. The time delay, which is used to select a suitable set of parameters for a chosen controller, could be calculated online, using the time stamps of the actuator and feedback signal. The paper proposes the framework of the controller with preliminary discussions on the various components of the controller, including: 1) the offline controller database, 2) the online detection of undamped oscillations, and 3) the online corrective control actions at the actuator. The 4-machine 2-area case study results demonstrated the advantage of the proposed method.

关键词： Small signal stability phasor measurement units (PMUs) power system stabilizer (PSS) wide area control damping controller time delay controllers timestamp time delay undamped oscillations central controller OFF LINE Frameworks actuators

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Period distribution analysis of some linear maps

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Communications in Nonlinear Science and Numerical simulation 2012年第10期17卷 3848-3856页

作者： Fei Chen Xiaofeng Liao Kwok-wo Wong Qi Han Yang Li State Key Lab. of Power Transmission Equipment and System Security College of Computer Science Chongqing University Chongqing 400044 PR China Department of Electronic Engineering City University of Hong Kong Hong Kong PR China Department of Automatic Control and Systems Engineering The University of Sheffield UK

This paper discusses period properties of some linear maps which are employed in various applications such as image encryption, public key cryptography and watermarking. Conditions for the bijectiveness of such maps and the existence of a period are presented. Period structure is also given. Then, the recurrence equation theory is adopted to address the period distribution problem. Finally, a framework to solve the problem is proposed with a demonstration of its effectiveness and efficiency into some applications.

关键词： Linear map Period distribution Periodic orbit Dynamical system Cat map

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Impact of "Coal to Electricity" Policy on Air Quality During Heating Period Over Beijing−Tianjin−Hebei Region in China by Wrf-Chem Model

SSRN

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SSRN 2022年

作者： Zhang, Ruting Chen, Chuanmin Liu, Songtao Wu, Huacheng Zhou, Weiqing Li, Peng Jia, Wenbo Cao, Yue Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control Department of Environmental Science and Engineering North China Electric Power University Baoding071003 China Jibei Electric Power Research Institute State Grid Jibei Electric Power Co. Ltd. North China Electric Power Research Institute Company Limited Beijing100045 China The Key Laboratory of Resources and Environmental Systems Optimization

To improve the quality of the atmospheric environment, the Chinese government has issued guidance on alternative energy and formulated a series of control measures such as "coal to electricity" policy, but impacts of the implementation of "coal to electricity" policy on air quality cannot be accurately quantified. In this study, by conducting basic scenario and emission reduction scenario simulation experiments, we find that the daily PM2.5 decreased by 0.2−5.6 μg/m3 due to the policy while the decreases in PM2.5 concentrations varied from 1−6% in Beijing, Tianjin, Baoding, Shijiazhuang during the heating period. During the heavy pollution process on December 15, 2018, the hourly average concentration of PM2.5 decreased by 1.02−7.53 μg/m3 in most Beijing−Tianjin−Hebei (BTH) region. The implementation of the policy has different degrees of reduction effects on BTH region under various air quality index (AQI) levels, and the policy also affected the AQI level in BTH region. In the heating period, the number of days that AQI level changes in the BTH region accounts for up to 13%. For other pollutants, the average reduction of PM10, CO, SO2 and NO2 concentration over BTH region in December 2018 ranged from 0.42−11.47, 0.01−0.77, 0.39−24.18, 0.76−2.91 μg/m3, respectively. Even if the "coal to electricity" policy replaced part of the residential sector of emission sources, it plays an important role in improving air quality over BTH region. We suggest that policies should be formulated and improved according to the actual situation to further complete energy transformation such as coal substitution. © 2022, The Authors. All rights reserved.

关键词： Coal

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Fast and Safe Heating-Up control of a Planar Solid Oxide Cell Stack: A Three-Dimensional Model-in-The-Loop Study

SSRN

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SSRN 2022年

作者： Chi, Yingtian Li, Peiyang Lin, Jin Mu, Shujun Song, Yonghua State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing100087 China Tsinghua-Sichuan Energy Internet Research Institute Chengdu610213 China National Institute of Clean-and-Low-Carbon Energy Changping District Beijing102211 China State Key Laboratory of Internet of Things for Smart City University of Macau 999078 China

A fast heating-up rate generally conflicts with the temperature homogeneity of solid oxide cell (SOC) stacks. This study designs an adaptive model predictive controller (MPC) to regulate the heating-up process of SOC stacks. The controller solves an optimization problem in real time to obtain optimal control that shortens the heating-up time by fully using the safety limit. The controller is verified with a three-dimensional (3D) hotbox-stack model calibrated with experiments. 3D model-in-the-loop (MiL) simulations show that the controller is effective under two heating modes despite of model deviations. Under the electrical heating mode, the controller achieves a 33% acceleration compared with a reference control strategy. Comparisons of electrical and gas heating reveal that the former is 63% faster but the latter consumes 41.6% less energy if the waste heat is fully recovered. The hotbox heat capacity is a major limiting factor for the heating-up process, particularly under the gas heating mode. An 80% reduction in the hotbox heat capacity, which can be achieved by reducing the thickness of the insulation layer, improves the heating-up time and the net energy consumption by 69% and 65% under the gas heating mode, respectively. © 2022, The Authors. All rights reserved.

关键词： Model predictive control

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A Corrective Security-Constrained Optimal power Flow Method for AC/DC Hybrid systems Based on MMC-HVDC

A Corrective Security-Constrained Optimal Power Flow Method ...

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IEEE Conference on Energy Internet and Energy System Integration

作者： Yi Lin Yu-chen Tang Liu-qing Qiu Ming-ye Zhang Yu-tao Ju State Grid Fujian Power Economic Research Institute State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Tsinghua University College of Information and Electrical Engineering China Agricultural University

ISBN: (纸本)9781538614280

This paper presents an optimal power flow (OPF) model for AC/DC meshed networks with Modular Multilevel Converter based High Voltage Direct Current (MMC-HVDC) system. The OPF problem is formulated to minimize the total network loss of the whole AC/DC grids by adjusting generators and modular multilevel converters considering N-1 constraints and post-contingency corrective control. A practical method is proposed to handle N-1 static security constraints and corrective control with OPF more effectively. simulations are conducted on IEEE 39-bus testing system and a practical power grid. The results demonstrate the effectiveness of the approach.

关键词： Modular Multilevel Converter HVDC Optimal power flow Interior point method N-1 static security constraints Corrective control

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Nanosecond-pulse Dielectric Barrier Discharge Using Magnetic Compression Solid-state Pulsed power

Nanosecond-pulse Dielectric Barrier Discharge Using Magnetic...

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IEEE International power Modulator and Hogh Voltage Conference

作者： Tao Shao Yang Yu Cheng Zhang Zheng Niu Dongdong Zhang Jue Wang Yaohong Sun Ping Yan Yuanxiang Zhou Institute of Electrical Engineering Chinese Academy of Sciences State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Electrical Engineering Department Tsinghua University

ISBN: (纸本)9781424471317

Dielectric barrier discharge excitated by unipolar pulsed power is a promising approach for producing non-thermal plasma at atmospheric pressure. A magnetic compression solid-state pulse power generator is used to produce dielectric barrier discharge (DBD). The generator is capable of providing repetitive pulses with the voltage of up to 30 kV and duration of 70 ns at a 300 Ω resistive load. This paper illustrates electrical characteristic and luminous emissions of DBD excitated by repetitive unipolar nanosecond-pulses in atmospheric air. Different from common DBD excitated by high-voltage AC sources, discharge current of DBD in the experimental investigation can be on an order of tens of amperes. When the DBD is created using two liquid electrodes, the luminous emissions from the obverse and flank sides of liquid electrodes show that no filament is observed and the discharge is homogeneous and diffuse in the whole discharge regime.

关键词： Dielectric barrier discharge Pulsed power Magnetic compression Repetitive nanosecond pulses Atmospheric pressure air Gas discharge Homogeneous discharge

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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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