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

作者： Jianying Li Mingqiang Wang Zhen Fang Zhixin Wang Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education (Shandong University) Jinan China

ISBN: (数字)9781728143033

ISBN: (纸本)9781728143040

Spinning reserve is the unused capacity of synchronized units and it is used to address the unforeseen events during power system operations. This paper proposes a spinning reserve optimization method under the multiple time resolution unified unit commitment and economic dispatch model. Finer time resolution and detailed modeling will be used during the first few hours of the scheduling cycle, while coarser time resolution and simplified modeling will be used during the remaining hours. The spinning reserve is determined by minimizing the running cost, start-up cost, shut-down cost, reserve cost and the expected interruption cost. In order to overcome the computation intractability introduced by EENS, EENS is formulated as linear function of the system spinning reserve. It is found that the multiple time resolution model is fit for determining multiple type of reserves rather than single type of reserve. The efficiency and validity of the proposed method is verified using the IEEE-RTS system.

关键词： Uncertainty Optimization Energy resolution power systems Computational modeling Synchronization Spinning

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PMU-based Real-time Distribution system State Estimation Considering Anomaly Detection, Discrimination and Identification

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INTERNATIONAL JOURNAL OF ELECTRICAL power & ENERGY systemS 2023年 148卷

作者： Veerakumar, Nidarshan Cetenovic, Dragan Kongurai, Krit Popov, Marjan Jongepier, Arjen Terzija, Vladimir Delft Univ Technol Fac EEMCS Mekelweg 4 NL-2628 CD Delft Netherlands Univ Manchester Dept Elect & Elect Engn Manchester England Univ Kragujevac Fac Tech Sci Cacak Svetog Save 65 Cacak 32000 Serbia Stedin Grp BV Blaak 8 NL-3011 TA Rotterdam Netherlands Shandong Univ Sch Elect Engn Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan 250061 Peoples R China

In this paper, a real-time state estimation platform for distribution grids monitored by Phasor Measurement Units (PMUs) is developed, tested, and validated using Real Time Digital Simulator (RTDS). The developed platform serves as a proof-of-concept for potential implementation in an existing 50 kV ring network of the Dutch distribution utility Stedin medium voltage distribution grid located in the southwest (Zeeland area) of the Netherlands. To catch up with the fast sampling rates of PMUs, the platform incorporates computationally efficient techniques for state estimation and detection, discrimination and identification of anomalies like bad data and sudden load changes. Forecasting Aided State Estimation has been utilized to enable measurement innovations needed for fast anomaly detection, discrimination, and identification, whilst the Extended Kalman Filter (EKF) algorithm is selected to provide fast state forecasting and filtering. The platform has been tested under various normal and abnormal operating conditions considering different statistical properties of measurement noise as well as different bad data and sudden load change scenarios. To demonstrate advantages and disadvantages for embedding EKF into the platform, EKF is compared with Unscented Kalman Filter (UKF) in terms of estimation accuracy, computational efficiency, and compatibility with the module for anomaly detection, discrimination, and identification. The results of extensive simulations provide good hints about the feasibility of PMU-based real-time state estimation for the Stedin distribution grid.

关键词： Anomaly detection Discrimination and identification Bad data Extended kalman filter Forecasting-aided state estimation Real time digital simulator Sudden load change

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Economic dispatch Considering Flexibility Provided by Load Static Voltage Characteristics 3

Economic Dispatch Considering Flexibility Provided by Load S...

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3rd IEEE Conference on Energy Internet and Energy system Integration, EI2 2019

作者： Wu, Yuqian Wang, Mingqiang Song, Yichen Zhang, Xiuping Shandong University Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Jinan China

ISBN: (数字)9781728131375

ISBN: (纸本)9781728131375

With the increase of proportion of renewable energy in the power system, the uncertainty in the power system is significantly increase, and the system's renewable energy consumption is facing more challenges. In traditional economic dispatch module, the load is often expressed by constant power, which cannot reflect the impact of static load voltage regulation on system operation. This paper proposes a new economic dispatching model in which the static load voltage regulation is respected. The proposed model can fully exert the automatic adjustment ability of load and provide some flexibility for the system. The results of the example show that considering the precise load model in scheduling helps to enhance the system to accommodate more renewable energy and improve the economics of system operation. © 2019 IEEE.

关键词： Renewable energy resources

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Faulty feeder selection and segment location method for SPTG fault in radial MMC-MVDC distribution grid

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IET GENERATION TRANSMISSION & DISTRIBUTION 2020年第2期14卷 223-233页

作者： Zeng, Yu Zou, Guibin Zhang, Xin Wei, Xiuyan Jiang, Lingtong Sun, Chenjun Nanyang Technol Univ Sch Elect & Elect Engn 50 Nanyang Ave Singapore 639798 Singapore Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan Peoples R China State Grid Hunan Maintenance Co Changsha Peoples R China State Grid Hebei Power Supply Co Shijiazhuang Hebei Peoples R China

As a modular multilevel converter-based medium-voltage direct current (MMC-MVDC) distribution grid mostly utilises small current grounding modes, the weak fault current for single-pole-to-ground (SPTG) fault is very difficult to detect especially in the case of noises and fault resistance. Therefore, this study proposes a fast and accurate faulty feeder selection and segment location method. For SPTG fault, the transient current fault component is the charge-discharge current of distributed capacitance on the DC feeder. Analysis indicates that the waveforms of current fault component of positive and negative poles are negatively correlated for a faulty feeder;while they are positively correlated for a non-faulty feeder. According to these characteristics, a faulty feeder selection criterion using Pearson correlation coefficient (PCC) is constructed. Then, utilising the energies difference between the current fault components of two poles, the faulty pole can be verified. In addition, the faulty segment is located by the PCC of the current fault component on both sides of each segment. Finally, simulation results confirm the validity of the proposed faulty feeder selection and segment location method.

关键词： power distribution protection fault location earthing power grids power convertors power distribution faults DC distribution systems power system transients Pearson correlation coefficient PCC fast faulty feeder selection criterion nonfaulty feeder negative poles positive poles DC feeder transient current fault component fault resistance single-pole-to-ground fault weak fault current current grounding modes modular multilevel converter-based medium-voltage direct current distribution grid radial MMC-MVDC distribution grid SPTG fault

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Fault location of HVDC transmission line based on improved genetic algorithm 8

Fault location of HVDC transmission line based on improved g...

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

作者： Zhang, Jianlei Gao, Zhanjun Xie, Xiufang Yin, Huanhuan Wang, Zhiyuan Shandong University Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Jinan China

ISBN: (纸本)9781728117225

Aiming at the problem that the current time domain fault location method has low accuracy under the change of line parameters, this paper takes line parameter errors and fault location results as variables to participate in the calculation, forming a multi-variables optimization problem. The standard genetic algorithm is optimized to realize the non-linear adaptive adjustment of crossover rate and mutation rate according to fitness, which effectively improves the search ability and convergence speed of the algorithm. PSCAD simulation software and MATlab are used to verify the algorithm. The simulation results show that the method is not affected by fault location and transitional resistance, and can achieve accurate fault location in the whole transmission line. © 2019 IEEE.

关键词： Genetic algorithms

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Robust Decentralized Coordination of Transmission and Active Distribution Networks

Robust Decentralized Coordination of Transmission and Active...

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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： Peng Li Ming Yang Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Shandong University Jinan China

ISBN: (数字)9781728171920

ISBN: (纸本)9781728171937

In this paper, a novel robust decentralized dispatch approach is presented, which can efficiently coordinate the transmission network and connected active distribution networks (ADN). The concept of allowable power exchange interval (APEI) is introduced in the coordination of the integrated networks so that the transmission network can receive reserve capacity support from connected ADNs, which further exploits the flexibility in ADNs. Meanwhile, the risk of accommodating wind power has also been considered in the optimization to make a trade-off between the operational risk and costs and a tradeoff between the transmission network and ADNs. Besides, the alternating direction method of multipliers (ADMM) is adopted to decompose the centralized robust coordinated dispatch model for the integrated transmission network and ADNs into several dispatch sub-models. To efficiently release the computational burden, a new affine policy is adopted to transform the resulting nonlinear sub-models into linear optimization sub-problems that can be optimized effectively and globally with off-the-shelf solvers. The effectiveness and efficiency of the proposed robust decentralized approach was validated using two test systems.

关键词： Transforms Wind power generation power markets Computational efficiency Active distribution networks Reliability Optimization

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Research on Modeling and Application of MagnetoOptical Measurement Technology

Research on Modeling and Application of MagnetoOptical Measu...

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IEEE Student Conference on Electric Machines and systems

作者： Bo Wang Shiming Liu Yongsen Zhao Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Ministry of Education Jinan China

ISBN: (数字)9781728156224

ISBN: (纸本)9781728156231

This paper analyzes the magneto-optical measurement technology based on the Faraday magneto-optical effect. First, the principle of magneto-optical measurement technology is introduced, and the functional relationship between the photoelectric conversion voltage V and the magnetic induction intensity B is derived. Then the model of the magneto-optical measurement technology is realized by using experimental data and nonlinear fitting algorithms. Finally, it lists the applications based on magneto-optical measurement technology, and focuses on the application in transmission lines. This paper proposes to use the phase of the photoelectric conversion voltage waveform to reflect the phase of the current in the transmission line to achieve phase differenctial protection. This method is applying for a patent.

关键词： Voltage measurement Magnetic field measurement Current measurement Transmission line measurements Data models Software measurement Magnetooptic effects

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A calculation method of electrical distance considering operation mode

A calculation method of electrical distance considering oper...

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International Seminar on Computer Science and Engineering Technology (SCSET)

作者： Peng, Peiqi Chen, Kai Xu, Taoyang Li, Changgang Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan Shandong Peoples R China

An electrical distance calculation method considering operation mode is proposed. Based on line impedance, Phase-angle difference between buses is taken into account to characterize strength of electrical connections. Derivation of electrical distance considering operation mode is introduced. Comparing with traditional impedance electrical distance calculation method, rationality of this method was verified. Electrical distance of IEEE 39 example system is calculated. To explain effect of operating mode on the electrical distance, electrical zone division of power system under different operation modes are compared.

关键词： Electric connectors

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Renewable energy sources planning considering approximate dynamic network reconfiguration and nonlinear correlations of uncertainties in distribution network

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INTERNATIONAL JOURNAL OF ELECTRICAL power & ENERGY systemS 2022年 139卷 107791-107791页

作者： Wang, Wei Huang, Yifan Yang, Ming Chen, Changyue Zhang, Yumin Xu, Xingming Shandong Univ Sci & Technol Coll Intelligent Equipment Tai An 271019 Shandong Peoples R China Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250061 Peoples R China Shandong Univ Finance & Econ Dongfang Coll Sch Publ Educ Tai An 271000 Shandong Peoples R China Shandong Univ Sci & Technol Coll Elect Engn & Automat Qingdao 266590 Peoples R China

With the development and application of renewable energy sources (RESs) into distribution networks, how to handle the correlations of uncertainties and the network reconfiguration in the RESs planning procedure is a significant challenge. Different from the conventional methods which assume that the uncertainties are linear correlation, the nonlinear correlations of uncertainties are modeled by applying copula theory. The joint probability density functions (PDFs) of wind speed-load and irradiance-load are developed. Based on the scenarios generated by Monte Carlo sampling (MCS), a chance constrained RESs planning model is established. The approximate dynamic network reconfiguration (ADNR) instead of static network reconfiguration is incorporated in the particle swarm optimization (PSO)-based solution algorithm process, which can get a better solution. Numerical simulations on an actual distribution network show the superiority of the proposed algorithm over the existing methods.

关键词： Renewable energy sources (RESs) planning Distribution network Copula theory Particle swarm optimization (PSO) Approximate dynamic network reconfiguration (ADNR)

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Continuous Under-Frequency Load Shedding Scheme for power system Adaptive Frequency control

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IEEE TRANSACTIONS ON power systemS 2020年第2期35卷 950-961页

作者： Li, Changgang Wu, Yue Sun, Yanli Zhang, Hengxu Liu, Yutian Liu, Yilu Terzija, Vladimir Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250061 Peoples R China Univ Tennessee Dept Elect Engn & Comp Sci Knoxville TN 37996 USA Univ Manchester Sch Elect & Elect Engn Manchester M60 1QD Lancs England

Frequency drop due to loss of massive generation is a threat to power system frequency stability. Under-frequency load shedding (UFLS) is the principal measure to prevent successive frequency declination and blackouts. Based on traditional stage-by-stage UFLS scheme, a new continuous UFLS scheme is proposed in this paper to shed loads proportional to frequency deviation. The characteristic of the proposed scheme is analyzed with a closed-form solution of frequency dynamics. Frequency threshold and time delay are added to make the proposed scheme practical. A line-by-line scheme based on precise load control is introduced to implement the continuous scheme for systems without enough continuously controllable loads. The load shedding scale factor of the proposed scheme is tuned with an analytical method to achieve adaptability to different operating conditions. The adaptability of the proposed scheme is validated with 39-bus New England model and simplified Shandong power Grid of China.

关键词： power systems frequency stability under-frequency load shedding (UFLS) continuous control precise load control

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