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Dynamic modeling and practical verification of a photovoltaic and thermal composite module system

IOP Conference Series: Materials Science and Engineering 2019年第3期612卷

作者： Jiyong Li Min Chen Jigang Wang College of Electrical Engineering Guangxi University Nanning 530004 China Guangxi Key Laboratory of Power System Optimization and Energy Technology Guangxi University Nanning 530004 China

In order to further improve the prediction accuracy of PV/T module temperature, this paper conducts dynamic modeling of PV/T module heat transfer mechanism based on lumped parameter method. The accuracy of the dynamic model was verified by experiments on typical sunny and cloudy days. The experimental results show that the maximum relative errors of the predicted values in sunny and cloudy weather are 7.8% and 7.6% respectively. The average relative errors were 4.31% and 4.37% respectively. The average absolute error is 2.04°C, 1.94°C. Compared with the existing neural network prediction methods, the mathematical model has higher prediction accuracy and shorter prediction period. This model can be used for PV/T system to formulate accurate control strategy in advance according to the temperature change situation, so as to optimize the energy saving during system operation. It can also be used for establishing the overall energy transfer model of PV/T system, realizing the coordinated control of thermal energy and electric energy and the cascade utilization of solar energy.

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Dynamic Simulation Test for Traveling Wave Fault Positioning system in Distribution Network

Dynamic Simulation Test for Traveling Wave Fault Positioning...

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China International electrical and energy Conference (CIEEC)

作者： Chao Zhuo Yanru Ni Xiangjun Zeng Yang Leng Yunkun Xiang Guangxi Key Laboratory of Power System Optimization and Energy Technology Guangxi University Nanning Guangxi Zhuang Autonomous Region China Collaborative Innovation Center of Clean Energy and Electric Power Technology Changsha University of Science and Technology Changsha Hunan Province China State Grid Hunan Energy Conservation Service Company State Grid Hunan Electric Power Company Changsha Hunan Province China

ISBN: (纸本)9781538653937

Fault positioning system based on traveling wave has been widely used in engineering application, but the test technology still needs further study. The research status of test methods was introduced in this paper, and the reason of existing test technology is not suitable for fault location system was researched. Then the idea of dynamic simulation test system was put forward, including simulation methods of distribution lines, fault signal and traveling wave signal acquisition. Thus, a 10kV distribution network dynamic simulation test model was built, and dynamic simulation test scheme for fault positioning system was designed, introducing the fault setting method and the system function test project in detail. The experimental results showed that the dynamic simulation test platform is close to the actual operation environment of the distribution network, which can effectively estimate technical indicators of the voltage traveling wave positioning system into operation.

关键词： power system dynamics Fault location power cables Transient analysis Circuit faults

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Reconfiguration of distribution network based on Jordan frames with energy storage system

Reconfiguration of distribution network based on Jordan fram...

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IEEE Conference on energy Internet and energy system Integration (EI2)

作者： Zhiwei Cui Xiaoqing Bai Peijie Li Yiqi Cao Zhewei Diao Key Laboratory of Guangxi Electric Power System Optimization and Energy-saving Technology Guangxi University Nanning China

ISBN: (纸本)9781538614280

Considering the problem that the wind energy is unadjustable to the distribution network reconfiguration, this paper proposes a mixed-integer second order cone optimization model based on Jordan frames for the minimum losses distribution network reconfiguration with storage problem. The exact solutions of the model can be obtained efficiently. In addition, the proposal model can be solved to global optimality using available optimization solvers, such as Gurobi. Numerical results on two test networks including distributed generations show that the proposed model based on Jordan frames with storage is effective in reducing the network losses for network reconfiguration.

关键词： Mathematical model Numerical models energy storage optimization Reactive power Distributed power generation Wind power generation

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A Wide Area Service Oriented Architecture Design for Plug and Play of power Grid Equipment

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Procedia Computer Science 2018年 129卷 353-357页

作者： Dapeng Li Zhenyu Chen Zhaoyun Deng Wenying Huang Jihong Tang Fangchun Di Xingyu Gao Qiaoyun Xie Li Liu Xinfan Jiang Beijing Key Laboratory of Research and System Evaluation of Power Dispatching Automation Technology Beijing 100192 China China Electric Power Research Institute Beijing 100192 China State Key Laboratory of Power Grid Security and Energy Saving Beijing 100192 China State Grid Fujian Electric Power Company Fuzhou Fujian 350003 China State Grid Hunan Electric Power Company Changsha Hunan 410007 China Institute of Microelectronics Chinese Academy of Sciences Beijing 100029 China

In this paper, we propose a wide-area service-oriented architecture design for plug and play power grid equipment, which adopts the service proxy mechanism to manage and control the service domain accessed to the wide area network through the domain management center. Accordingly, the service management center controls the service registration, the targeting (discovery) and the service information in the service domain. It also provides the functions of maintenance-free access and communication, service object management, service subscription and distribution between service providers and service consumers in wide-area interactions. Subsequently, our proposed architecture is able to achieve the servitization interaction of power grid applications, and enhance the level of information sharing and the capacity of business collaboration between the main station of dispatch and control and intelligent electric substation. It also can provide the practical guidance for automatic access of substation equipment, the function improvement of the main control station and the service transformation of its applications.

关键词： Wide-area Service Oriented Architecture (WSOA) power grid equipment plug play

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A Parallel Approach for Optimal power Flow With Transient Stability Constraints

A Parallel Approach for Optimal Power Flow With Transient St...

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IEEE Conference on energy Internet and energy system Integration

作者： Yude Yang Anjun Song Hui Liu Zhijun Qin Jun Deng Guangxi Key Laboratory of Power System Optimization and Energy Technology Guangxi University State Grid Shaanxi Electric Power Research Institute

ISBN: (纸本)9781538614280

Based on the Optimal power Flow with Transient Stability Constraints (OTS) model, this paper presents a parallel method to solving the shortcoming of current method on large calculation. Meanwhile, according to the swing curves of generator rotor and the characteristics of transient stability analysis, a simple and credible criteria to determine transient stability is proposed. The parallel method improved the accuracy and calculation speed of the stability assessment. Numerical results on three test systems, the NE-39 system, the IEEE 300-bus system and 703-bus systems, show that the OTS model based on parallel computation is effective in reducing the computing time.

关键词： power system Transient Stability Optimal power Flow Parallel Computing

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Dynamic Simulation Test for Traveling Wave Fault Location system in Distribution Network

Dynamic Simulation Test for Traveling Wave Fault Location Sy...

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2017 International electrical and energy Conference (CIEEC 2017)

作者： Chao Zhuo Yanru Ni Xiangjun Zeng Yang Leng Yunkun Xiang Guangxi Key Laboratory of Power System Optimization and Energy Technology Guangxi University Collaborative Innovation Center of Clean Energy and Electric Power Technology Changsha University of Science and Technology

Fault location system based on traveling wave has been widely used in engineering application,but the test technology still needs further *** research status of test methods was introduced in this paper,and the reason of existing test technology is not suitable for traveling wave fault location system was *** the idea of dynamic simulation test system was put forward,including simulation methods of distribution lines,fault signal and traveling wave signal ***,a 10 kV distribution network dynamic simulation test model was built,and dynamic simulation test scheme for traveling wave fault location system was designed,introducing the fault setting method and the system function test project in *** experimental results showed that the dynamic simulation test system is close to the actual operation environment of the distribution network,which can effectively estimate technical indicators of the traveling wave fault location system into operation.

关键词： dynamic simulation test distribution network fault location traveling wave

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Model Management and Service Based power Grid Multi -Agent Dispatcher Training Simulator

Model Management and Service Based Power Grid Multi -Agent D...

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IEEE Conference on energy Internet and energy system Integration (EI2)

作者： Xiaolin Qi Zhenyu Chen Dapeng Li Zhihong Li Yunhao Huang Yifei Yang Linpeng Zhang Xingyu Gao Liyue Chen Zhengping Chen Beijing Key Lab of Research and System Evaluation of Power Dispatching Automation Technology Beijing China State Key Laboratory of Power Grid Security and Energy Saving Beijing China State Grid Beijing Electric Power Company Beijing China Institute of Microelectronics Chinese Academy of Sciences Beijing China State Grid Zhejiang Electric Power Company Hangzhou Zhejiang China State Grid Fujian Electric Power Company Fuzhou Fujian China

The joint anti-accident exercises in multi-level dispatching and control systems using dispatcher training simulator (DTS)are distributed interactive simulation. It has many problems, such as wide cross domain, tedious training preparation, and complex communication etc. Based on model management service, DTS of multi-level and multi-area becomes reality. It is an effective way to study the distributed complex system such as DTS based on multi-agent theory. In this paper, the application of agent in DTS is divided into three stages. The first stage is part-role agent. The second stage is whole-roles agent. The last stage is functional-module agent. This paper puts forwards the simulation model of agent in three stages. The purpose is achieving two kinds of conversion, one is transforming dispatcher training into agent training, the other is transforming dispatcher from being evaluated into a decision maker. The new DTS with agent technology is verified feasibly and effectively comparing with the traditional DTS system.

关键词： Training Dispatching Monitoring power grids Control systems Data models

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A Parallel Approach for Multi-Contingency Transient Stability Constrained Optimal power Flow

A Parallel Approach for Multi-Contingency Transient Stabilit...

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IEEE power and energy Society General Meeting

作者： Yude Yang Wentai Liu Jun Deng Hui Liu Hua Wei Tingting Wang Department of Electrical Engineering Guangxi University State Grid Shanxi Electric Power Research Institute Guangxi Key Laboratory of Power System Optimization and Energy Technology

ISBN: (纸本)9781538622131;9781538622124

Large-scale multi-contingency transient stability optimal power flow (TSCOPF) is a hard problem due to its high computational intensity. This paper presents a new contingency-level parallel approach to solve TSCOPF on multi-core infrastructure. By utilizing the recursive reduced-order decoupling algorithm, the proposed parallel implementation makes each contingency being handled independently on CPU cores. The approach is implemented in client-workers parallelism and reliefs computation burden by decomposing contingencies. Case studies show that this parallel approach reduces computational time and expands with ease as the number of contingencies increases.

关键词： Mathematical model power system stability Generators Thermal stability Transient analysis Numerical stability

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Forecasting of Dissolved Gases in Oil-immersed Transformers Based upon Wavelet LS-SVM Regression and PSO with Mutation

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energy Procedia 2016年 104卷 38-43页

作者： Y.Y. Zhang H. Wei Y.D. Yang H.B. Zheng T. Zhou J. Jiao Guangxi Key Laboratory of Power System Optimization and Energy Technology Guangxi University Nanning Guangxi 530004 China State Grid Henan Electric Power Research Institute Zhengzhou Henan 450052 China

An approach combing wavelet technique with least square support vector machine (LS-SVM) for forecasting of dissolved gases in oil-immersed transformers was proposed in the paper. The algorithm of particle swarm optimization (PSO) with mutation is employed to optimize the hyper-parameters of constructed wavelet LS-SVM regression (W-LSSVR). Evaluation of forecasting performance is based upon the measures of squared correlation coefficient and mean absolute percentage error. On the basis of the proposed approach, experimental results show that the approach is capable of forecasting the dissolved gas contents accurately. In addition, two types of forecasting approaches, the back propagation neural network (BPNN), the radial basis function neural network (RBFNN), are used to compare with W-LSSVR. The comparisons confirm that the W-LSSVR based upon PSO with mutation has a better generalization capability and is more effective than the others.

关键词： wavelet technique least squares support vector machine dissolved gases oil-immersed transformers particle swarm optimization.

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Fractal Analysis of Complex power Load Variations Through Adaptive Multiscale Filtering

Fractal Analysis of Complex Power Load Variations Through Ad...

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International Conference on Behavior, Economic and Socio-cultural Computing

作者： Aihua Jiang Jianbo Gao Guangxi key Laboratory of Power System Optimization and Energy Technology Guangxi University Institute of Complexity Science and Big Data Technology Guangxi University

ISBN: (纸本)9781509061655

power load analysis is important for optimizing resource allocation, planning the production of electricity, and predicting power markets. Yet, it is challenging, since load data exhibit both periodic and stochastic features, and is affected by a multitude of factors including social, economic, political, and climatic factors, as well as industrial structure, living standards, and user behaviors. In this paper, we employ a multiscale framework to systematically analyze load data from two electric utilities in two cities of different size in China. The low frequency trend signals in both load data sets are quite irregular. The detrended data of the load time series are further denoised to remove high frequency noise. Fourier spectral analysis of the original and filtered data shows that the load time series has very strong spectral peaks corresponding to a period of one day. Using adaptive fractal analysis, which can best extract fractal behaviors from signals with strong oscillatory trends, we further show that load time series has long-range correlations. Amazingly, maxima of the temporal variations of the long-range correlations correspond well with temperature minima, highlighting that long-range correlations are stronger in winter than in summer.

关键词： power load variation Fractals Multiscale analysis

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