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Optimal Decomposition of Stochastic Dispatch Schedule for Renewable Energy Cluster

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Journal of Modern power Systems and Clean Energy 2021年第4期9卷 711-719页

作者： Yue Yang Wenchuan Wu Bin Wang Mingjie Li Tao Zhu State Key Laboratory of power Systems Department of Electrical EngineeringTsinghua UniversityBeijing 100084China National electric power Control Center of State Grid corporation of China BeijingChina Kunming electric power Supply Company of Yunnan power Grid corporation KunmingChina

The correlated renewable energy farms are usually aggregated as a cluster in economic dispatch to relieve computational *** strategy can also achieve better performance since the precision of predicting the power generation of a cluster can be higher than those of individual *** paper proposes an optimal decomposition method to allocate dispatch schedules among renewable energy farms(REFs)in the cluster under existing stochastic optimization *** proposed model takes advantage of probabilistic characteristics of renewable generation to minimize the curtailment and ensure the feasibility of dispatch schedule of the *** tractable formulation and efficient solution method are the proposed to solve the proposed *** tests show that the proposed method achieves the optimal decomposition of dispatch schedule among REFs and facilitates the utilization of renewable generation.

关键词： Renewable energy stochastic optimization economic dispatch decomposition of dispatch schedule

Hygrothermal ageing performance of high temperature vulcanised silicone rubber and its degradation mechanism

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High Voltage 2023年第6期8卷 1196-1205页

作者： Yu Deng Bo Peng Zheyuan Liu Yujun Du Songsong Zhou Jinghua Liu Xinzhe Yu Jun Zhou State Key Laboratory of power Grid Environmental Protection(China electric power Research Institute) BeijingChina State Grid corporation of China BeijingChina

High temperature vulcanised silicone rubber(SR)has excellent hydrophobicity and thus is widely applied both in indoor and outdoor *** to the analysis of different experimental ageing tests and field investigation of SR,temperature and humidity are considered to be the fundamental factors during *** ageing was proposed in this study to simulate the chalking state of the SR,finally leading to the irreversible degradation far below the thermal decomposition *** variation of morphology,hardness and polydimethylsiloxane(PDMS)content was quantified during the yearlong hygrothermal ageing *** is implied that the gradual process of whitening and hardening are accompanied by the decline of the PDMS ***,ageing delamination in SR and its degradation mechanism were proposed.

关键词： thermal mechanism rubber

Excitation and Detection of Shear Horizontal Waves with Electromagnetic Acoustic Transducers for Nondestructive Testing of Plates

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Chinese Journal of Mechanical Engineering 2014年第2期27卷 428-436页

作者： MA Qingzeng JIAO Jingpin HU Ping ZHONG Xi WU Bin HE Cunfu electric power Research Institute of Guangdong power Grid corporation College of Mechanical Engineering and Applied Electronics Technology Beijing University of Technology

The fundamental shear horizontal（SH0） wave has several unique features that are attractive for long-range nondestructive testing（NDT）. By a careful design of the geometric configuration, electromagnetic acoustic transducers（EMATs） have the capability to generate a wide range of guided wave modes, such as Lamb waves and shear-horizontal（SH） waves in plates. However, the performance of EMATs is influenced by their parameters. To evaluate the performance of periodic permanent magnet（PPM） EMATs, a distributed-line-source model is developed to calculate the angular acoustic field cross-section in the far-field. Numerical analysis is conducted to investigate the performance of such EMATs with different geometric parameters, such as period and number of magnet arrays, and inner and outer coil widths. Such parameters have a great influence on the directivity of the generated SH0 waves that arises mainly in the amplitude and width of both main and side lobes. According to the numerical analysis, these parameters are optimized to obtain better directivity. Optimized PPM EMATs are designed and used for NDT of strip plates. Experimental results show that the lateral boundary of the strip plate has no perceivable influence on SHO-wave propagation, thus validating their used in NDT. The proposed model predicts the radiation pattern ofPPM EMATs, and can be used for their parameter optimization.

关键词： electromagnetic acoustic transducers shear-horizontal waves strip plate nondestructive testing

Hierarchical protection control system of smart substations

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Journal of Modern power Systems and Clean Energy 2014年第3期2卷 282-288页

作者： Yuping ZHENG Delin WANG Zexin ZHOU Tuanjie CAO NARI Group corporation Nanjing 211106China National electric power Dispatching Control Center Beijing 100031China China electric power Research Institute Beijing 100192China

This paper analyzes the problems of the relay protections and secondary circuits of traditional substations,and introduces the hierarchical protection and control system of smart substations based on the technologies like IEC 61850 Standard,electronic instrument transformer,process level network,and wide area optical fiber communication network,*** hierarchical protection and control system includes three levels:local area protection,substation area protection and control,and wide area protection and *** three levels are combined to solve the problems of the relay protections in traditional substations,thus improving protection performance and control capability of the system.

关键词： Smart substation Relay protection Hierarchical protection and control system Local area protection Substation area protection and control Wide area protection and control

Architecture,Key Technologies and Applications of Load Dispatching in China power Grid

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Journal of Modern power Systems and Clean Energy 2022年第2期10卷 316-327页

作者： Yu Dong Xin Shan Yaqin Yan Xiwu Leng Yi Wang State Grid corporation of China Beijing 100031China NARI Group corporation(State Grid electric power Research Institute) Nanjing 211000China

With the development of renewable energy and the changes in the characteristics of power grid,it is becoming increasingly difficult to balance power supply and demand in space and *** addition,the requirement for improved dispatching capability of power grid is ***,the potential of flexible load dispatching should be realized,which can promote the large-scale consumption of renewable energy and the construction of new power *** on the analysis of existing load dispatching studies and the differences in the characteristics of domestic and foreign load dispatchings,a technical architecture and several key technologies are proposed for load resources to participate in power grid dispatching under the new situation,i.e.,the autonomous collaborative control system of load *** system implements the multi-layer coordinated control of main,distribution and micro grids(load aggregators).Adjustable load resources are aggregated through an aggregator operation platform and connected with a dispatcher load regulator platform to realize real-time data interaction with dispatching agencies as well as the monitoring,con-trol,and marketing of *** supports the load resources to participate in network-wide dispatching optimization via continuous power *** key technologies such as the control mode,load modeling,dispatching strategy,and safety protection are also *** the closed-loop control of orderly charging piles and energy storage clusters in the North China power Grid,the feasibility of the proposed architecture and key technologies is *** route has successively supported multiple adjustable load aggregators to partici-pate in the ancillary services market of North China power Grid for ***,the technical challenges of load resources participating in power grid dispatching under the dual carbon goals are discussed and prospected.

关键词： Automatic power control(APC) load modeling load dispatching renewable energy accommodation situation awareness.

Dynamic Response of Tension Plate for UHVDC Transmission Lines Under Ice Shedding Loads

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CSEE Journal of power and Energy Systems 2022年第3期8卷 952-962页

作者： Jiajun Si Lixian Zhou Kuanjun Zhu Hongyan Zhao Bin Liu Xiaoming Rui Shengchun Liu China electric power Research Institute Beijing 100192China North China electric power University Beijing 102206China beijing Institute of Astronautical Systems Engineering Beijing 100075China electric power Research Institute Beijing 100192China

Ice shedding problems have severely threatened the safety of overhead transmission lines and caused enormous ruptures or failures of the conductors and their *** is of great importance to study the dynamic properties of the transmission lines under ice shedding *** perform such analysis,the dynamic behavior of two typical strain sections for UHVDC transmission lines under different ice shedding conditions were simulated in this ***,the dynamic response of the key tension plate as well as its buckling properties was analyzed based on the extacted ice shedding ***,laboratory tests were conducted at the China electric power Research Institute to assess the critical value of the buckling of the tension *** results show that the key tension plate studied in this paper is primarily influenced by the loads along the transmission lines after taking its dynamic response and buckling properties under synthetic ice shedding conditions into *** short-term fluctuation of the tension should be the major focus in tension plate designs.

关键词： Dynamic response ice shedding effect nonlinear buckling tension plate UHVDC transmission lines

Integrated Distribution Management System:Architecture,Functions,and Application in China

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Journal of Modern power Systems and Clean Energy 2022年第2期10卷 245-258页

作者： Wenchuan Wu Penghua Li Bin Wang Yingshang Liu Tao Xu Hongwei Du Yan He the State Key Laboratory of power Systems Department of Electrical EngineeringTsinghua UniversityBeijing 100084China the electric power Control Center of China Southern power Grid corporation GuangzhouChina the National electric power Control Center of State Grid corporation of China BeijingChina NARI Technology Co. Ltd.NanjingChina beijing Guoke Hengtong Technology Co. Ltd.BeijingChina

As massive distributed energy resources(DERs)are integrated into distribution networks(DNs)and the distribution automation facilities are widely deployed,the DNs are evolving to active distribution networks(ADNs).This paper introduces the architecture and main function modules of an integrated distribution management system(IDMS)and its applica-tions in *** system consists of three subsystems,including the real-time operation and control system(OCS),outage management system(OMS),and operator training simulator(OTS).The OCS has a hierarchical architecture with three levels,including the local controller for DER clusters,the optimization of DNs incorporated with multi-clusters,and the coordina-tion operation of integrated transmission&distribution(T&D)*** OMS is developed based on the geographical information system(GIS)and coordinated with *** in the OTS,both the ADN and its host transmission network(TN)are simulated to make the simulation results more *** main functions of the three subsystems and their interaction data flows are described and some typical application scenarios are also presented.

关键词： Active distribution network(ADN) integrated distribution management system(IDMS) operation and control system(OCS) outage management system(OMS) operator training simulator(OTS) geographical information system(GIS).

Model predictive control and improved low-pass filtering strategies based on wind power fluctuation mitigation

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Journal of Modern power Systems and Clean Energy 2019年第3期7卷 512-524页

作者： Yushu SUN Xisheng TANG Xiaozhe SUN Dongqiang JIA Zhihuang CAO Jing PAN Bin XU Institute of electrical Engineering Chinese Academy of SciencesBeijing 100190China Sinopec Oilfield Service Shengli corporation Tarim Branch Company Korla 841000China State Grid beijing electric power Company electric power Research Institute Beijing 100075China State Grid Anhui electric power Company Hefei 230000China

The rapid development of renewable energy sources such as wind power has brought great challenges to the power grid. Wind power penetration can be improved by using hybrid energy storage(ES) to mitigate wind power fluctuation. We studied the strategy of smoothing wind power fluctuation and the strategy of hybrid ES power distribution. Firstly, an effective control strategy can be extracted by comparing constant-time low-pass filtering(CLF), variable-time low-pass filtering(VLF), wavelet packet decomposition(WPD), empirical mode decomposition(EMD) and model predictive control algorithms with fluctuation rate constraints of the identical grid-connected wind power. Moreover, the mean frequency of ES as the cutoff frequency can be acquired by the Hilbert Huang transform(HHT), and the time constant of filtering algorithm can be obtained. Then, an improved low-pass filtering algorithm(ILFA) is proposed to achieve the power allocation between lithium battery(LB) and supercapacitor(SC), which can overcome the over-charge and over-discharge of ES in the traditional low-pass filtering algorithm(TLFA). In addition, the optimized LB and SC power are further obtained based on the SC priority control strategy combined with the fuzzy control(FC) method. Finally, simulation results show that wind power fluctuation can be effectively suppressed by LB and SC based on the proposed control strategies, which is beneficial to the development of wind and storage system.

关键词： Wind power fluctuation mitigation Control strategies Model predictive control algorithm Hybrid energy storage(ES) Improved low-pass filtering algorithm(ILFA) Fuzzy control(FC) Strategy

Economic optimization for configuration and sizing of micro integrated energy systems

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Journal of Modern power Systems and Clean Energy 2018年第2期6卷 330-341页

作者： Haibo YU Chao ZHANG Zuqiang DENG Haifeng BIAN Chenjun SUN Chen JIA NARI Group corporation (State Grid electric powerResearch Institute) beijing NARI Dianyan Huayuan electric power TechnologyCo. Ltd. State Grid Hebei electric power Company

Based on analysis of construction and operation of micro integrated energy systems(MIES), this paper presents economic optimization for their configuration and sizing. After presenting typical models for MIES, a residential community MIES is developed by analyzing residential direct energy consumption within a general design procedure. Integrating with available current technologies and local resources, the systematic design considers a prime mover, fed by natural gas, with wind power, photovoltaic generation, and two storage devices serving thermal energy and power to satisfy cooling, heating and electricity demands. Control strategies for MIES also arepresented in this study. Multi-objective formulas are obtained by analyzing annual cost and dumped renewable energy to achieve optimal coordination of energy supply and demand. According to historical load data and the probability distribution of distributed generation output,clustering methods based on K-means and discretization methods are employed to obtain typical scenarios representative of uncertainties. The modified non-dominated sorting genetic algorithm is applied to find the Pareto frontier of the constructed multi-objective formulas. In addition, aiming to explore the Pareto frontier, the dumped energy cost ratio is defined to check the energy balance in different MIES designs and provide decision support for the investors. Finally, simulations and comparision show the appropriateness of the developed model and the applicability of the adopted optimization algorithm.

关键词： Micro integrated energy system(MIES) Economic optimization Uncertainties Non-dominated sorting genetic algorithm(NSGA-II)