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2019 4th Asia Conference on power and Electrical Engineering, ACPEE 2019

作者： Xu, Bo Zhang, Yumin Sun, Kongming State Grid Energy Research Institute Co. Ltd. Beijing China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Shandong Province Jinan250061 China State Grid Shandong Electric Power Research Institute Shandong Province Jinan250003 China

This paper investigates the impact of opportunistic maintenance strategy on power equipment maintenance scheduling under economic dependence. The model focuses on power equipment with two types of failures: random failure and deterioration failure. Unlike previous research which didn't consider opportunistic maintenance between different failures modes, opportunistic maintenance strategy is proposed in this paper. In the opportunistic maintenance strategy, whenever random failure occurs, decision has to be made on whether deterioration failure is preventively maintained based on the degree of equipment deterioration and economic dependence. Firstly, Markov process is used to describe equipment state-space diagram. And then, in order to determine the optimal inspection rate, preventive maintenance threshold and opportunistic maintenance threshold of power equipment, the analytical expressions of inspection cost, maintenance cost, repair cost and outage cost are quantified. Finally, the total cost is minimized to get the optimal maintenance strategy. Case studies demonstrate the feasibility of the proposed model. © Published under licence by IOP Publishing Ltd.

关键词： Deterioration

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A Method for system Reliability Evaluation Based on Inexact Interval Probability 2

A Method for System Reliability Evaluation Based on Inexact ...

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2019 2nd International Conference on Advanced Algorithms and control Engineering, ICAACE 2019

作者： Li, Chen Wang, Li Yu, Qiao Li, Meng Wang, Bolun Zhou, Yingjian Zhang, Zhewen State Grid Qingdao Power Supply Company Qingdao Shandong Province266000 China State Grid Jiangsu Electric Power Co. Ltd Research Institute Nanjing Jiangsu Province210000 China Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Shandong University Jinan Shandong Province250061 China

With a large number of new components and new technologies widely used in power system, the method of power equipment outage probability based on law of large number will no longer be applicable due to the lack of statistical data. This paper considers the high order uncertainty of component failure probability under the condition of small sample size and uses interval values to represent the reliability parameters of the component when carrying out the risk assessment of power system, and propose Belief Universal Generating Function by combining Universal Generating Function with Belief Function Theory. This method can effectively avoid over estimation in interval arithmetic and get a more accurate interval value of power system risk assessment index. © 2019 IOP Publishing Ltd. All rights reserved.

关键词： Risk assessment

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Frequency control Strategy of DFIGs based on Improved Virtual Inertia Method

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IOP Conference Series: Earth and Environmental Science 2021年第1期838卷

作者： Zhimin Gao Yongji Cao Hengxu Zhang Hao Qin Dong Yang Huan Ma Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Shandong University Jinan China State Grid Shandong Electric Power Research Institute State Grid Shandong Electric Power Company Jinan China

The DFIGs can participate in frequency control by virtual inertia method. After exiting the frequency control, secondary frequency drop will occur inevitably. The current study of the problem mostly focused on the rotor speed recovery strategy and PD control parameter optimization problems, which cannot eliminate the phenomenon of secondary frequency drop in essence. This paper proposes a frequency control strategy based on the improved virtual inertia control method. When the DFIG exits the frequency modulation process, the supplementary control component based on the turbine speed is added to avoid the sudden drop of output power, so as to suppress the secondary frequency drop. Finally, a simulation model is built in Matlab/Simulink, and the feasibility of the proposed strategy is verified in two case studies of power system frequency reduction and load fluctuation.

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A Method for Multi-HVDC Grouping Based on Spectral Clustering

A Method for Multi-HVDC Grouping Based on Spectral Clusterin...

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IEEE/IAS Industrial and Commercial power system Asia (I&CPS Asia)

作者： Xiaohui Wang Yu Bai Yadong Gao Dong Liu Yan Zhang Zhidong Wang Feng Gao Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Jinan China Zhejiang Huayun Electric Power Engineering Design & Consulting Co. Ltd Hangzhou China State Grid Corporation of China (SGCC) State Grid Economic and Technological Research Institute Co. Ltd Beijing China

ISBN: (数字)9781728143033

ISBN: (纸本)9781728143040

To satisfy the increasing power demands in load center, multiple HVDCs have been integrated into the receiving grid in China. The reality raises the coordination issues of HVDCs. A HVDC grouping method for optimizing the management of multiple HVDCs is proposed in this paper. Several kinds of relationship in coordination and complementarity between HVDCs are analyzed and quantified. Based on graph theory, HVDC grouping is transformed into a graph-cut problem and solved by spectral clustering algorithm. The proposed method is implemented on a practical multi-HVDC grid, and the results show its feasibility and effectiveness.

关键词： HVDC transmission Voltage control Reactive power Couplings Indexes Clustering algorithms Converters

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Dynamic reconfiguration of three-phase unbalanced distribution networks

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INTERNATIONAL JOURNAL OF ELECTRICAL power & ENERGY systemS 2018年 99卷 1-10页

作者： Zhai, H. F. Yang, M. Chen, B. Kang, N. Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250061 Shandong Peoples R China Argonne Natl Lab Energy Syst Div Argonne IL 60439 USA

The increasing penetration of distributed generations (DGs) and variable loads introduces significant power fluctuations to distribution networks, rendering conventional reconfiguration strategies ineffective. In the context of an active distribution network (ADN), remote control switches can be operated in real time through a centralized control scheme. Therein the distribution network topology can be configured in a flexible and dynamic manner capable of adapting to time-varying load demand and DG output. This paper presents a dynamic reconfiguration approach for a three-phase unbalanced distribution network. The ADN topology is optimized for the look-ahead time periods and is adaptive to the time-varying load demand and DG output while minimizing the daily power loss costs. To improve the calculation efficiency, several linearization methods are introduced to formulate the dynamic reconfiguration as a mixed-integer linear programming problem, which can be effectively solved using off-the-shelf solvers. The effectiveness of the proposed approach is verified by the test results obtained on a modified IEEE 34 node test feeder.

关键词： Distributed generation Mixed-Integer linear programming Reconfiguration Unbalanced distribution network

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A Transformer Fault Diagnosis Method Based on Bayesian Network 2

A Transformer Fault Diagnosis Method Based on Bayesian Netwo...

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2019 2nd International Conference on Advanced Algorithms and control Engineering, ICAACE 2019

作者： Zhe-Wen, Zhang Yong, Wang Ding, Ying Lei, Tian Ying-Jian, Zhou Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan Shandong Province250061 China State Grid of China Technology College Jinan Shandong Province250002 China State Grid Shandong Electric Power Company Finance Department Jinan Shandong Province250001 China

This paper summarizes the fault types and fault hazards of the transformer, and combs the corresponding relationship between the transformer fault types and the fault symptoms, which provides reference for the transformer fault diagnosis and state maintenance. Based on the analysis of the existing transformer fault diagnosis, the transformer fault diagnosis based on Bayesian network is mainly studied. Bayesian network has advantages in machine learning, data reasoning and so on. It has been widely applied in the field of fault diagnosis. In this paper, the QMR model of transformer fault diagnosis is established by using the principle of Bayesian network and the relationship between fault type and fault feature, and the model is used to diagnose the specific fault. Then the paper further analyzes the result of fault diagnosis in order to prove the correctness and validity of Bayesian network. © 2019 Published under licence by IOP Publishing Ltd.

关键词： Bayesian networks

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Multi-time scale optimal dispatch in ADN based on MILP

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INTERNATIONAL JOURNAL OF ELECTRICAL power & ENERGY systemS 2018年 102卷 393-400页

作者： Zou, Guibin Ma, Yuwei Yang, Jingjing Hou, Meiyi Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan Shandong Peoples R China State Grid Weifang Elect Power Co Weifang Shandong Peoples R China

With the development of active distribution network (ADN) and the increase of penetration rate of new energy such as wind power and photovoltaic, the optimal operation problem of ADN is facing challenges. So, this paper proposes a multi-time scale optimal dispatch method based on mixed-integer linear programming to improve the calculation speed of the traditional dispatching model. First, the linear branch power flow of distribution network is introduced, and the main elements in ADN are modeled, meanwhile, the linearization method is used to simplify the non-linear components. Then, the day-ahead dispatch model is established by considering the active and reactive power coordination. In addition, in order to reduce the influence of the stochastic power from DG and FL on dispatch results, taking the results of day-ahead dispatch as reference, an auxiliary short-term dispatch model is also constructed to maximize the consumption of wind and photovoltaic (PV) power. Finally, the validity and reliability of the proposed method are verified by a modified IEEE 33-node distribution system.

关键词： Active distribution network Day-ahead dispatch Mixed-integer linear programming (MILP) Multi-time scale Short-term dispatch

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Mechanism and Mitigation Strategy of Sub-synchronous Oscillation Caused by Grid-connected DFIG with Series Compensation

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Journal of Physics: Conference Series 2021年第1期2125卷

作者： Jing Yang Yong Sun Ladier Fa Shuhan Zhang Zhihao Wang Limin Mei Key Laboratory of Wind Power Technology of Zhejiang Province Zhejiang Windey Co. Ltd Hangzhou Zhejiang 310000 China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan Shandong 250000 China

power systems are at risk of sub-synchronous oscillation (SSO) when connecting doubly-fed induction generator (DFIG)-based wind turbines to transmission lines with series compensation. This paper focuses on the mechanism and mitigation strategy of SSO. Firstly, the mechanism of SSO is studied from two aspects: induction generator effect (IGE) and sub-synchronous control interaction (SSCI). An equivalent circuit is developed to illustrate the negative resistance effect. Based on the result of the analysis, the SSO mitigation strategy using notch filter and virtual resistance control is proposed. In order to verify the result of analysis and the effectiveness of mitigation strategy, time-domain simulations are carried out based on powerFactory DIgSILENT.

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Research on power Grid Fault Diagnosis Based on Bayesian Information Fusion

Research on Power Grid Fault Diagnosis Based on Bayesian Inf...

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International Conference on Advanced power system Automation and Protection (APAP)

作者： Zhiyuan Wang Zhanjun Gao Huanhuan Yin Jianlei Zhang Cunzheng Shang Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Ministry of Education Jinan China Qilu Normal University Jinan China

ISBN: (数字)9781728117225

ISBN: (纸本)9781728117232

This paper proposes a power grid fault diagnosis method based on cluster analysis. The method uses multi-source fault information to determine faulty components, and it can get accurately result in the absence of information. The multi-source fault information used in this paper includes wide-area system measurement information, fault recorder information and protection action information. The method firstly uses multi-level information analysis method to analyze the power grid fault information, extracts the fault features, and determines the suspicious fault component set through the clustering result and the switch action information. Then using the improved Bayesian probability model to fuse fault information and identify faulty components. Finally, this paper verifies the effectiveness and feasibility of the proposed method through concrete examples.

关键词： Circuit faults Bayes methods Fault diagnosis Switches Voltage measurement Correlation Wide area measurements

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Fault Ride Through Testing Method Based on DVR for Offshore Wind Turbines 44

Fault Ride Through Testing Method Based on DVR for Offshore ...

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44th Annual Conference of the IEEE Industrial-Electronics-Society (IECON)

作者： Jiang, Zimin Liu, Yutian Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan Peoples R China

ISBN: (纸本)9781509066841

To ensure the operation reliability of offshore wind turbines (WTs) during grid faults, it is essential to perform the on-site fault ride through (FRT) test before integrated into the grid. Taking account of the accessibility limitation and harsh sea conditions, the existing testing method applying the impedance-based fault emulating device is hardly to be adopted. This paper proposes a testing method combining high and low voltage ride through based on dynamic voltage restorer (DVR) for offshore WTs. The series connected DVR is controlled to compensate the voltage deviation from the required voltage sags or swells. Firstly, the FRT testing requirements and the system configuration are introduced. Then the control strategy for DVR is presented to maintain required voltage sags or swells. Finally, simulation results show that the voltage disturbances generated by the proposed method satisfy the testing requirements.

关键词： dynamic voltage restorer (DVR) fault ride through (FRT) offshore wind turbine test

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