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2nd IEEE International Conference on Electronics Technology, ICET 2019

作者： Cao, Yongji Xu, Qingwen Zhang, Hengxu Yu, Qingbin Gao, Song Li, Jun Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Shandong University Jinan250061 China State Grid Shandong Electric Power Company State Grid Shandong Electric Power Research Institute Jinan250002 China

ISBN: (纸本)9781728116181

Considering the adequate energy capacity and lower price of retired electric vehicle traction batteries, the second-life battery energy storage system (SLBESS) is of great significance for active distribution network (ADN) to enhance sustainable energy accommodation and decrease investment capital costs. This paper proposes a comprehensive assessment approach to quantify the operation performance of SLBES in the ADN. A multi-level comprehensive assessment framework is established, which incorporates both the operation benefits and electrical features. As for the SLBES operation benefits, the amount and volatility of exchanging power between the ADN and utility grid are adopted. Moreover, the voltage volatility, three-phase unbalance and harmonic content at the point of common coupling are taken as the main quantitative indices of electrical features. Furthermore, the analytic hierarchy process method is utilized to determine the relative weights of intra-level indices, and then the comprehensive assessment index is obtained via the linear weighted summing of sub-level quantitative indices orderly. A case study is conducted to demonstrate the effectiveness of the proposed assessment approach. © 2019 IEEE.

关键词： Analytic hierarchy process

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Modeling and simulation of large power system with inclusion of bipolar MTDC grid

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INTERNATIONAL JOURNAL OF ELECTRICAL power & ENERGY systemS 2020年 116卷

作者： Li, Guanqun Ye, Hua Gao, Shilin Liu, Yutian Gao, Lei Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ 17923 Jingshi Rd Jinan 250061 Shandong Peoples R China China Elect Power Res Inst 15 Xiaoying East Rd Beijing 100192 Peoples R China

This paper presents an electromechanical transient modeling and simulation method for large power system with inclusion of bipolar multi-terminal direct current (MTDC) grid. First, the dynamic model of a modular multilevel converter (MMC) is presented. The dynamic model of the bipolar DC grid is then established by using the companion circuit method. In particular, the inductances of DC lines are carefully modeled to ensure the simulation accuracy when a DC fault occurs. Second, the electromechanical transient simulation procedure for a power system with inclusion of an MTDC grid is presented. The AC and DC grids are solved alternately. Due to the difference between time constants of AC and DC grids, the multi-rate scheme is used to ensure the simulation efficiency. Third, the proposed method is employed to simulate a real-life large power system with inclusion of a bipolar MTDC grid. The simulation results validate the correctness and the effectiveness of the proposed method. Unique interaction characteristics between AC and DC grids are also revealed by the results.

关键词： Bipolar multi-terminal direct current (MTDC) Companion circuit method Electromechanical transient modeling power system simulation

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Distributed power Service Restoration Method of Distribution Network with Soft Open Point

Distributed Power Service Restoration Method of Distribution...

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

作者： Shoujing Sun Wei Cong Yaru Sheng Ming Chen Zhen Wei Key Laboratory of Power System Intelligent Dispatch and Control (Shandong University) Jinan China Key Laboratory of Smart Grid of Ministry of Education (Tianjin University) Tianjin China Qingdao Power Supply Company Shandong Electric Power Company State Grid Qingdao China

ISBN: (数字)9781728143033

ISBN: (纸本)9781728143040

Soft open point (SOP) is applied to the power service restoration of the distribution network because of the advantages of flexible control mode and optimizing the operation of the distribution network. Taking advantage of parallel collaborative between independent peer smart terminals unit (STU) in distribution network and information interaction ways of working, distributed power service restoration method of distribution network considering soft open point is put forward, which brings the superiority of SOP in the aspect of power service restoration into full play and avoids the problem of large information collection and calculation in the centralized power service restoration method. Firstly, the structure, control mode and power service restoration model of SOP are introduced, and then the distributed power service restoration method of distribution network with SOP is described, which mainly includes distributed network topology search and the expression and calculation of constraint conditions. Finally, a numerical simulation is carried out to verify the effectiveness of the proposed method.

关键词： Switches power supplies Network topology Topology Impedance Voltage control Switching circuits

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An Eight-Switch Five-Level Current Source Inverter

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IEEE TRANSACTIONS ON power ELECTRONICS 2019年第9期34卷 8389-8404页

作者： Wang, Weiqi Gao, Feng Yang, Yongheng Blaabjerg, Frede Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250061 Shandong Peoples R China Shandong Univ Sch Elect Engn Jinan 250061 Shandong Peoples R China Aalborg Univ Dept Energy Technol DK-9220 Aalborg Denmark

This paper proposes an eight-switch, three-phase, five-level current source inverter (CSI), which employs only one traditional H6 inverter and two shunt branches at the dc side to realize the five-level switching. The corresponding space-vector-modulation (SVM) strategy for the proposed CSI topology is also presented, which uses the two shunt-connected power switches to add certain special modulation-state segments to ensure the switching instants completed under lower current stresses and lower power dissipation. Compared with the state-of-the-art CSI solutions, the proposed topology has a comparable hardware cost as the three-level H6 CSI, while outputs five-level currents. The low-output total harmonic distortion (THD) may help to reduce the sizes of the passive components in the system, and the modulation scheme reduces the switching and conduction losses of the semiconductor switching devices in the H6 CSI module, which can make it possible to increase the output current rating of the system in a certain degree. Simulation and experimental results verified the performance of the proposed CSI.

关键词： Current source inverter (CSI) modulation multilevel converter

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Fault Cause Identification Method Based on Multi-Source Information Fusion for UHVDC Transmission Lines 8

Fault Cause Identification Method Based on Multi-Source Info...

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8th IEEE International Conference on Advanced power system Automation and Protection, APAP 2019

作者： Fan, Rongqi Li, Jing Ge, Ning Li, Kuan Wang, Zhiyuan Yin, Huanhuan State Grid Shandong Electric Power Company Jinan China State Grid Shandong Electric Power Research Institute Jinan China Shandong University Ministry of Education Key Laboratory of Power System Intelligent Dispatch and Control Jinan China

ISBN: (纸本)9781728117225

This paper proposes a fault cause identification method based on multi-source information for UHVDC transmission lines. The multi-source fault information used in this paper includes voltage, current,weather, season, time period, terrain and historical fault information. Firstly, the method analyzes multi-source fault information to extract fault features. Then, the BP neural network is used to fuse the multi-source fault feature. The output of the BP neural network is the probability of failure causes. This method selects the fault type with the highest probability. The effectiveness and feasibility of the method in identifying different types of fault causes are demonstrated by case tests. © 2019 IEEE.

关键词： Electric lines

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Application Case of Transient Energy Method in Location of Single Phase to Ground Fault

Application Case of Transient Energy Method in Location of S...

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

作者： Xie Wei Wang Xuewen Zhang Hengxu Shi Fang Xing Xiaodong Sun Baicong Fang Chen State Grid Shanghai Municipal Electric Power Company Shanghai China Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Shandong University Jinan China State Grid Shanghai Electric Power Research Institute Shanghai China

ISBN: (数字)9781728143033

ISBN: (纸本)9781728143040

The distribution networks in China and many other countries are mostly neutral inefficiently grounding systems (NIGS), and more than 80% of the faults in the distribution networks are single phase to ground (SPG) faults. Due to the weak fault current and imperfect detection equipment configuration, the faulted line section location methods of the SPG fault in NIGS has not been effectively resolved. The development and application of μM-PMU provides more comprehensive fault information support for fault diagnosis of distribution network. When a SPG fault occurs, the transient energy of the faulted line section is greater than the sum of the transient energy of other line sections. A faulted line section location algorithm based on transient energy is proposed. The algorithm is implemented and embedded in the master station, and the corresponding interface is designed. A field test plan was designed and implemented in a 35kV distribution network. The test results show that the algorithm can locate the faulted line section efficiently.

关键词： Transient analysis Circuit faults Grounding Resonant frequency Cutoff frequency Fault currents

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Toward intelligent Inertial Frequency Participation of Wind Farms for the Grid Frequency control

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IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS 2020年第11期16卷 6772-6786页

作者： Kheshti, Mostafa Ding, Lei Bao, Weiyu Yin, Minghui Wu, Qiuwei Terzija, Vladimir Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan 250061 Peoples R China Nanjing Univ Sci & Technol Sch Automat Nanjing 210094 Peoples R China Tech Univ Denmark Ctr Elect & Energy Dept Elect Engn DK-2800 Lyngby Denmark Shandong Univ Sch Elect Engn Jinan 250061 Peoples R China Univ Manchester Sch Elect & Elect Engn Manchester M13 9PL Lancs England

Evolving dynamics of modern power systems caused by high penetration of renewable energy sources increased the risk of failures and outages due to declining power system inertia. Large-scale wind farms must participate in frequency control that responds optimally in due time and adaptively in case of detecting power imbalance in the grid. Existing research studies have shown interest on stepwise inertial control (SIC) on wind turbines (WTs). However, the adequate power increment and time duration of WTs using SIC are the key questions that have not yet been fully addressed. This paper proposes an intelligent learning-based control system for WTs participation in frequency control, as well as for mitigating negative effects of the SIC. First, an appropriate optimization model for grid frequency control is defined. Then, the model is solved using lightning flash algorithm (LFA), imperialist competitive algorithm, and particle swarm optimization to control the WTs in a wind farm. The obtained dataset by LFA are applied to an artificial neural network that is trained with the Levenberg-Marquardt algorithm and LFA. The proposed control system optimally adjusts the power increment and duration time of participation for each WT in the farm. Analyses on a 100 MW wind farm has been integrated into the IEEE 9-bus system and experimental tests have proved the efficacy of the proposed approach.

关键词： Wind farms Frequency control Silicon carbide Rotors power systems Wind turbines Artificial neural networks (ANNs) intelligent control optimal frequency control stepwise inertial control (SIC) wind farm

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Abnormal Time Synchronization Detection of Substation IED based on Frequency Deviation 3

Abnormal Time Synchronization Detection of Substation IED ba...

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3rd IEEE International Electrical and Energy Conference (CIEEC)

作者： Liu, Shiming Zhu, Xisong Zhao, Guochao Zhang, Yuhao Wu, Jukun Shandong Univ Key Lab Syst Intelligent Dispatch & Control Jinan Shandong Peoples R China State Grid Jibei Elect Power Co Zhangjiakou Zhangjiakou Hebei Peoples R China

ISBN: (数字)9781728116754

ISBN: (纸本)9781728116754

The occurrence of abnormal time synchronization in smart substation will cause the clock pulse deviation of secondary system to normal time synchronization, affecting the normal operation of secondary equipment, especially relay protection devices. But there is still lack of efficient algorithms for detecting abnormal time synchronization. To improve the accuracy and speed of abnormal time synchronization detection, at first, the signal frequency is calculated by matrix-pencil filter quickly and accurately and frequency deviation is obtained by subtracting the actual value of signal frequency. Then the relationship between the clock pulse intervals of the substation, the sampling interval and the signal frequency are studied and the calculation formula of the time synchronization deviation is derived. On this basis, a substation abnormal time synchronization detection algorithm based on frequency deviation is proposed. When the deviation is larger than the set threshold value, the abnormal time synchronization can he accurately detected and the time synchronization deviation will be calculated, which can provide necessary information for the calibration of the secondary device and locking of relay protection. It is verified by simulation that this algorithm can accurately detect abnormal time synchronization in a time window of 1ms in case of time synchronization deviation is larger than. It has high detection accuracy and precision, and can meet the requirements of relay protection for high precision of time synchronization.

关键词： abnormal time synchronization frequency deviation time synchronization deviation matrix-pencil filter smart substation

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Combined Heat and power Optimal dispatch Considering Wind power Uncertainty

Combined Heat and Power Optimal Dispatch Considering Wind Po...

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International Symposium on power Electronics and control Engineering (ISPECE)

作者： Chen, Chunlong Han, Xueshan Li, Wenbo Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan Shandong Peoples R China State Grid Shandong Elect Power Res Inst Jinan 250003 Shandong Peoples R China

Large-scale integration of wind power is a clean alternative to power generation, but the uncertainty of wind power has become a huge dispatch challenge, which is much more serious in the northeast of China. For this reason, heat storage is configured to decouple thermoelectric constraint of CHP unit, releasing its flexibility and improving its peak-shifting ability. A random variable is introduced to represent wind power deviations firstly, then a chance constraint economic dispatch model of an aggregation unit containing wind power and CHP unit is established to explain the standby effect of heat storage on wind power uncertainty. Finally, a case study is conducted to verify the performance of the heat storage. The example results show that when configured with heat storage, the CHP unit have broadened its adjustable electrical output range, so more reserve capacity is released to cope with wind power uncertainty.

关键词： Heat storage

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Frequency Security Assessment for Receiving-end system Based on Deep Learning Method

Frequency Security Assessment for Receiving-end System Based...

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

作者： Changhui Ma Liang Wang Chenhao Gai Dong Yang Pengfei Zhang Hengxu Zhang Changgang Li State Grid Shandong Electric Power Company Electric Power Research Institute Jinan Shandong China State Grid Shandong Electrical Power Company Dispatch and Control Center Jinan Shandong China Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Shandong University Jinan Shandong China State Grid International Development Limited Beijing China

ISBN: (数字)9781728143033

ISBN: (纸本)9781728143040

For hours-ahead assessment of power systems with a high penetration level of renewable generation, a large number of uncertain scenarios should be checked to ensure the frequency security of the system after the severe power disturbance following HVDC blocking. In this situation, the full time-domain simulation is unsuitable as a result of the heavy calculation burden. To fulfill the quick assessment of the frequency security, the online frequency security assessment framework based on deep learning is proposed in this paper. The Deep Belief Network (DBN) method is used to establish the framework. The sample generation method is researched to generate representative samples for the purposed of higher assessment accuracy. A large-scale AC-DC interconnected power grid is adopted to verify the validity of the proposed assessment method.

关键词： Industrial power systems Asia Conferences

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