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Multi-objective Optimal Allocation Strategy for Distributed Energy Storage in Distribution Networks Adapted to High Penetration Distributed Photovoltaics

Multi-objective Optimal Allocation Strategy for Distributed ...

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power and Electrical Engineering (ACPEE), 5th Asia Conference on

作者： Cuiping Li Yanli Wang Yiming Chen Xuesong Qi Yunjing Liu Qian Fang Shengyuan Cui Yuming Wang Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Northeast Electric Power University Jilin China Science and Technology Section State Grid Shanghai South Power Supply Company Shanghai China Power dispatching and control center Jilin Power Supply Company Jilin China Science and Technology Section Jilin Power Supply Company Jilin China Ministry of Science and Technology Jilin Power Supply Company Jilin China

ISBN: (数字)9798350309638

ISBN: (纸本)9798350309645

High percentage of photovoltaic gain connect to the wire line, so that the electricity grid from power distribution of the receiving end of the network into a set of production, storage, distribution of multi-source complex new network, the distribution network security operation and new energy consumption pressure increases. In response to the above, this paper puts forward the distributed ES multi-objective optimization configuration strategy of distribution network adapted to the high penetration rate distributed PV. And through a county power grid practical example to certify that the ES configuration approach proposed can effectively mitigate the impact of a high proportion of PV accessed, and it can reduce the abandonment of light.

关键词： Photovoltaic systems Wires Distribution networks Production power grids Regulation Resource management

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Two-Stage Virtual Inertia control Strategy with Coordination of Energy Storage System

Two-Stage Virtual Inertia Control Strategy with Coordination...

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Electrical Engineering and Mechatronics Technology (ICEEMT), IEEE International Conference on

作者： Yening Lai Zhaohui Qie Yongji Cao Hengxu Zhang Zhimin Gao Hao Qin Jian Zhang Xuening Cao State Grid Electric Power Research Institute NARI Group Corporation Nanjing China Academy of Intelligent Innovation Shandong University Jinan China Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Shandong University Jinan China

To address the lack of effective cooperative control of each inertia support resource, the principles of cooperative inertia control in the power system with a high percentage of renewable energies are studied and the problems of cooperative inertia control are summarized. To make the wind turbine generator (WTG) participate in inertia response based on rotor kinetic energy method and the photovoltaic (PV) unit participate in inertia response based on capacitive energy storage method. The inertia response stage enables the energy storage system (ESS) based on sag control to collaborate with the WTG and PV unit for inertia support, and the frequency recovery stage enables ESS based on fuzzy control to improve the frequency response performance. The fuzzy control rules are formulated to propose a virtual inertia cooperative control method for the WTG, PV unit, and ESS. A case study is conducted to verify the effectiveness of the proposed strategy.

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Risk Map of Rainstorm Induced Outage of Distribution System

Risk Map of Rainstorm Induced Outage of Distribution System

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IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Le Wang Jie Tang Yuanfei Huang Ke Wang Zenghong Jian Electric Power Research Institute Guangxi Power Grid Co. Ltd. Nanning China Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment Nanning China Nanning Power Supply Bureau Co. Guangxi Power Grid Co. Ltd. Nanning China

Extreme rainfall is one of the major adverse climate event that could result in extensive outage of distribution system. There is defect in the code to defend against extremes of rainfall in power utilities. Since distribution terminals (including distribution transformer and etc.) serve users in limited ranges and many of them locate in low-lying areas around the users, numerous distribution terminals fall outage due to extreme rainfall induced flooding. Flood risk of Nanning with extreme rainfall is analyzed with 2-dimensional hydrodynamic FloodArea model. The extreme rainfall of 10-year recurrence interval is estimated with generalized extreme value. Thereafter, geographic information and time series of rainfall are fed to 2-dimensional hydrodynamic model to implement numerical simulation. The range and depth of inundation map are generated for various extreme rainfalls. Moreover, the flood risk map of distribution terminals could be generated based on the inundation map. Simulation results show that the proposed approach could demonstrate risk map of rainfall induced inundation and outage risk map of distribution terminals, which could help harden distribution system against extreme rainfall.

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Two-step Optimal Allocation of Stationary and Mobile Energy Storage Systems in Resilient Distribution Networks

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Journal of Modern power Systems and Clean Energy 2021年第4期9卷 788-799页

作者： Xinyi Jiang Jian Chen Qiuwei Wu Wen Zhang Yicheng Zhang Jie Liu Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong UniversityJinan 250061China Center for Electric Power and Energy(CEE) Department of Electrical EngineeringTechnical University of Denmark(DTU)2800 Kongens LyngbyDenmark Institute for Infocomm Research(I2R) Agency for ScienceTechnology and Research(A*STAR)Singapore State Grid Yantai Power Supply Company YantaiChina

Energy storage systems (ESSs) are acknowledged to be a promising option to cope with issues in high penetration of renewable energy and guarantee a highly reliable power supply. In this paper, a two-step optimal allocation model is proposed to obtain the optimal allocation (location and size) of stationary ESSs (SESSs) and mobile ESSs (MESSs) in the resilient distribution networks (DNs). In the first step, a mixed-integer linear programming (MILP) problem is formulated to obtain the preselected location of ESSs with consideration of different scenarios under normal operation conditions. In the second step, a two-stage robust optimization model is established to get the optimal allocation results of ESSs under failure operation conditions which are solved by column-and-constraint generation (C&CG) algorithm. A hybrid ESS allocation strategy based on the subjective and objective weight analysis is proposed to give the final allocation scheme of SESSs and MESSs. Finally, the proposed two-step optimal allocation model is demonstrated on a modified IEEE 33-bus system to show its effectiveness and merits.

关键词： Resilient distribution network stationary energy storage system mobile energy storage system optimal allocation

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A Novel Bidirectional Converter for Spacecraft Battery Charge and Discharge Systems

A Novel Bidirectional Converter for Spacecraft Battery Charg...

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International Conference on power and Energy Technology (ICPET)

作者： Shuaifei Yang Yang Li Yang Liu Chunyu Wu Shichao Liu Lei Shi Lei Jia State Key Laboratory of Space Power-Sources Technology Shanghai Institute of Space Power-Sources Shanghai China State Grid Lu’an Dispatching and Control Center State Grid Anhui Electric Power Company Anhui China Baotou District for Army Equipment Department The First Military Representative Office Inner Mongolia China

The battery charge and discharge regulator (BCDR) is an important component of space power supply system. The use of bidirectional DC-DC converter instead of traditional dual unidirectional DC-DC converter can make the whole power supply lighter, smaller in size and higher in power density, which meets the development needs of miniaturization and lightweight of space power supply in the future. In this paper, a bidirectional SuperBuck-Boost DC-DC converter integrated charging and discharging circuit topology is proposed, and the operation principle and characteristics of the circuit topology are analyzed, The battery charge and discharge control strategy based on the bidirectional SuperBuck-Boost converter is proposed, and the feasibility of the circuit topology and control strategy is verified by a 500W prototype.

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Accurate comparison method of load data of power outage events of users

Accurate comparison method of load data of power outage even...

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Electrical Engineering and control Science (IC2ECS), International Conference on

作者： Chenying Yi Yangjun Zhou Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment Electric Power Research Institute of Guangxi Power Grid Co.Ltd Nanning China

In this paper, aiming at the problems of low accuracy and difficulty in comparison of existing customer power outage load data, an accurate comparison method of customer power outage load data is proposed, which includes multiple linear regression model and verification, residual diagram auxiliary analysis, F and R test and accurate method comparison. In this paper, multiple linear regression is adopted, considering the influence of daily maximum temperature, daily minimum temperature, daily average temperature, precipitation, humidity and other factors on the load data model of power outages. Every time an independent variable is introduced, the variables already in the equation will be F-tested, and the variables that meet the elimination criteria will be eliminated one by one. In addition, residual diagram auxiliary analysis, F and R tests will ensure the accuracy of the processed load data of power outages and eliminate adverse effects. Error RES and R2 goodness-of-fit test are used for comparison. Compared with traditional methods, many methods are used to ensure the accuracy of data in the process of data processing, which greatly improves the reliability of data comparison.

关键词： Electrical engineering Temperature distribution Precipitation Linear regression Humidity Reliability engineering Data models

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Voltage Characteristic Analysis of Ultra-high Voltage Half-wavelength Transmission System Based on Wave Process Method

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Journal of Modern power Systems and Clean Energy 2020年第1期8卷 150-158页

作者： Hao Tian Yutian Liu Dong Yang Xiaohui Qin Yantao Zhang Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong UniversityJinanChina State Grid Shandong Electric Power Research Institute JinanChina China Electric Power Research Institute BeijingChina

The voltage characteristics of a half-wavelength transmission(HWLT)system lack mechanism explanation and systematic *** this paper,both the steady-state and fault voltage characteristics are analyzed and explained based on the wave process *** analysis model is established for HWLT lines and wave propagation equations with different terminal conditions are *** steady-state conditions,voltage profiles along HWLT lines are depicted and partial overvoltage occurs when there is an overload or low-power *** addition,fault voltage characteristics are analyzed under load-rejection or short-circuit *** series resonance overvoltage will happen when short-circuit faults occur at certain positions and its peak value is influenced by grid strength or fault ***,a refined transmission line model is presented to consider non-ideal factors and simulation results demonstrate that geomorphic conditions and electromagnetic environments influence line voltage characteristics to a certain extent.

关键词： Half-wavelength transmission wave process method steady-state voltage fault voltage non-ideal factor

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Optimized functional design and simulation study of the fault line selection devices for non-solidly earthed network based on RTDS 9

Optimized functional design and simulation study of the faul...

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9th China International Conference on Electricity Distribution, CICED 2021

作者： Haiqing, Cai Qi, Guo Zhida, Huang Shiping, Liu Wencong, Wu Jiang, Yu Libin, Huang Zebing, Shi Shuyong, Li Electric Power Research Institute China Southern Power Grid State Key Laboratory of HVDC China National Energy Power Grid Technology R&D Centre Guangzhou510663 China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou510663 China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou510663 China Electric Power Research Institute of State Grid Jiangxi Electric Power Company Nanchang330096 China CSG Power Dispatch Control Center Guangzhou510663 China

ISBN: (纸本)9781728192291

The action accuracy of the fault line selection device is of great significance for ensuring the safe operation of the power system and personal safety. In view of the current imperfect function and the low accuracy of the small current grounding line selection device, the function of line selection of the device is further optimally designed and studied, and the post-acceleration and wheel-cutting functions are put forward and realized. The RTDS simulation model of non-solidly earthed network is established and connected with the actual grounding line selection device to form a closed-loop real-time simulation testing system. By setting up various test items, different types of ground fault test of non-solidly earthed net-work are carried out. The results of simulation show the accuracy of the line selection function, which provides important technical guidance for the implementation of the fault line selection device. © 2021 IEEE.

关键词： Electric grounding

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Optimal Identification of Unknown Parameters of Photovoltaic Models Using Dual-Population Gaining-Sharing Knowledge-Based Algorithm

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INTERNATIONAL JOURNAL OF intelligent SYSTEMS 2023年第1期2023卷

作者： Xiong, Guojiang Li, Lei Mohamed, Ali Wagdy Zhang, Jing Zhang, Yao Chen, Hao Guizhou Univ Coll Elect Engn Guizhou Key Lab Intelligent Technol Power Syst Guiyang 550025 Peoples R China Minist Educ Key Lab Ind Internet Things & Networked Control Chongqing 400065 Peoples R China Guizhou Power Grid Co Ltd Zunyi Power Supply Bur Zunyi 563000 Peoples R China Cairo Univ Fac Grad Studies Stat Res Operat Res Dept Giza 12613 Egypt Amer Univ Cairo Sch Sci & Engn Dept Math & Actuarial Sci Cairo Egypt Guizhou Elect Power Grid Dispatching & Control Ctr Guiyang 550002 Peoples R China Fujian Prov Key Lab Intelligent Identificat & Cont Quanzhou 362216 Peoples R China

Establishing an accurate equivalent model is a critical foundation to describe the energy conversion characteristics of a photovoltaic system, which can support the research of fault analysis, output power prediction, and performance analysis of the photovoltaic system. However, the widely used equivalent models are highly nonlinear and have many unknown parameters, making it difficult to identify these parameters accurately. Our previous work found that the gaining-sharing knowledge-based algorithm (GSK) shows promising performance in solving this problem. But its efficacy is not enough to achieve accurate parameters within a relatively limited computing resource. In this context, a dual-population GSK algorithm (DPGSK), which introduces a dual-population evolution strategy for more excellent searchability, is proposed to address this issue. In each iteration, the population splits equally and randomly into two subpopulations, one of which performs the junior gaining-sharing phase while the other performs the senior gaining-sharing phase. Then two updated subpopulations merge to form a new population. This allows for a grand reconciliation of convergence speed and population diversity, giving DPGSK powerful optimization performance. Afterward, DPGSK is applied to five photovoltaic models and validated for performance against other advanced metaheuristics. Besides, the impact of different components on DPGSK is also investigated. Results and comparisons show that either component is indispensable to DPGSK, and DPGSK strengthens the convergence and achieves accurate and reliable results, demonstrating its superiority over other algorithms in solving this studied problem.

关键词： Optimization

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Voltage Stability Evaluation Considering Successive Commutation Failure Risk

Voltage Stability Evaluation Considering Successive Commutat...

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control, Electronics and Computer Technology (ICCECT), IEEE International Conference on

作者： Rui Ding Hengtong Wang Zhaohao Jia Yuanzhen Zhu Changgang Li Yongji Cao State Grid Huangdao Power Supply Company State Grid Shandong Electric Power Company Qingdao China State Grid Zibo Power Supply Company State Grid Shandong Electric Power Company Zibo China State Grid Jinan Power Supply Company State Grid Shandong Electric Power Company Jinan China State Grid Shandong Electric Power Company State Grid Shandong Electric Power Research Institute Jinan China Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Shandong University Jinan China Academy of Intelligent Innovation Shandong University Jinan China

In order to evaluate the risk of successive commutation failure caused by voltage drop, a deep learning-based method is proposed in this paper. First, the mechanism of successive commutation failures is analyzed and the minimum second voltage drop value of the commutation bus after short-circuit fault is utilized as the index to quantify the severity of line outage contingencies. Then, to quickly evaluate the impact of multi-line outage failures on DC systems, a deep learning-based assessment network is built, of which the output is the minimum second voltage drop value of the commutation bus and inputs are steady-state features related to network structure. Moreover, a bus impedance matrix formation approach based on Woodbury formula is proposed, which is used in the calculation of input features and search index. Finally, simulation results based on a real-life AC/DC power system demonstrate that the proposed method significantly improves the risk evaluation efficiency of successive commutation failure.

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