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20th International Conference on AC and DC power Transmission 2024 (ACDC 2024)

作者： Yongqing Yang Hua Ye Guanqun Li Jialun Yang Yujing Zhao Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University 17923 Jingshi Road Jinan People's Republic of China State Grid Jinan Power Supply Company Jinan People's Republic of China

ISBN: (数字)9781837241552

Existing research on high-frequency oscillation indicates that the high-frequency oscillation during no-load charging of modular multilevel converter (MMC) station is primarily linked to time delay and the ground capacitance of AC lines. Nevertheless, a high-frequency oscillation around 2000 Hz has been observed in Rudong high voltage direct current project even when the AC lines are not connected. Except time delay, there still exists another key factor of the high-frequency oscillation, i.e., the transformer stray capacitance. This paper delves into the interaction among the dynamics of MMC station and the transformer. And the mechanism of high-frequency oscillation under no-load charging condition is determined. Firstly, the harmonic state space (HSS) model of MMC station considering the effect of stray capacitance is established. By plotting the eigenvalue trajectory, the essentiality of taking into account stray capacitance is elucidated. Subsequently, a simplified model is obtained by neglecting the dynamics of elements with low participation in the oscillation modes. Next, the mechanism of high-frequency oscillation is clarified according to impedance characteristics. Finally, the impact of proportional gain and shear frequency on small signal stability is revealed. The correctness and accuracy are identified by electromagnetic transient simulations.

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On the Feasibility of Harmonic Adaptability Remote Testing Method

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IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT 2020年第10期69卷 8156-8166页

作者： Jiang, Zimin Liu, Yutian Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan 250061 Peoples R China

As a significant part of grid code compliance verification, harmonic adaptability (HA) capability on-site testing is indispensable for offshore wind turbines. Although the HA remote testing method having no restrictions of harsh environment and resulting access limitation is regarded as an alternative to the existing testing method, the application scope and condition are not indicated explicitly, which enormously reduces its practicability in real testing. This article investigates the feasibility of the HA remote testing method. Based on the analysis of its working principle and a comprehensive caparison, two dominating factors affecting the feasibility are identified: the capacity of the applied active power filter and the power transmission capability of submarine cable. An assessment method comprising two indicators, i.e., the maximum resonance amplitude that can be suppressed and the feasible testing distance, is developed for the feasibility study. The application scope of the HA remote testing method is obtained with the proposed corresponding algorithm for the derived indicators. Extensive simulation results show that the HA remote testing method is viable and promising within the specified scope.

关键词： Testing Harmonic analysis power cables power system harmonics Underwater cables Harmonic distortion Cable feasibility grid code compliance harmonic adaptability (HA) offshore wind turbine (WT) remote testing

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Voltage Stability Evaluation Considering Successive Commutation Failure Risk

Voltage Stability Evaluation Considering Successive Commutat...

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2023 IEEE International Conference on control, Electronics and Computer Technology, ICCECT 2023

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

ISBN: (纸本)9798350399028

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. © 2023 IEEE.

关键词： Deep learning

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Optimization of the Tie Lines in Urban Distribution Network Based on Two-Tie Connection Mode 4

Optimization of the Tie Lines in Urban Distribution Network ...

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4th Asia Energy and Electrical Engineering Symposium (AEEES)

作者： Sun, Huazhong Li, Zongxuan Fang, Zhen Wang, Mingqiang Cui, Juan Weifang Power Supply Co State Grid Shandong Elect Power Co Weifang Peoples R China Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Jinan Peoples R China Shandong Univ Jinan Peoples R China Weifang Vocat Coll Weifang Peoples R China

ISBN: (纸本)9781665479141

Urban distribution network planning is a combinatorial optimization issue that requires consideration of many actual factors to make the planning more practical. It is difficult and time-consuming to artificially determine the feeder routing for a new urban area. In this paper, the tie line optimization model for urban distribution network based on the two-tie connection mode is researched. Firstly, we analysis the commonly used connection mode in current urban distribution network, and then present the planning strategy considering street layout to realize the optimization of tie lines in distribution network based on the two-tie connection mode units. Finally, we develop a mixed integer linear programming model for the optimization of tie lines which can be solved analytically. The validity and effectiveness of the proposed model are illustrated on a real 39-block district distribution system.

关键词： urban distribution network planning practical two-tie connection mode tie lines mixed integer linear programming model

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Operation and optimal sizing of combined P2G-GfG unit with gas storage for frequency regulation considering curtailed wind power

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INTERNATIONAL JOURNAL OF ELECTRICAL power & ENERGY systemS 2022年 141卷

作者： Zhang, Feng Salimu, Athuman Ding, Lei Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control 17923 Jingshi Rd Jinan 250061 Peoples R China

The increase in penetration of wind turbines in the power system has caused curtailment of wind power due the stochastic nature of wind, which results in loss of revenue. Consequently, power to gas (P2G) has emerged a device which can utilize curtailed wind power through the electrolysis of water to hydrogen or further processing to obtain methane. In addition, due to technical, economic and environmental benefits, the share of gas fired generating (GfG) units in power systems has been rising by replacing fossil fuel fired generating units. This paper proposes a coordinated operation and novel optimal sizing of a combined P2G-GfG system (CPGS) with gas storage tank (GST) for participating in frequency regulation. Firstly, the coordination operation of CPGS presented in which P2G utilizes the curtailed wind power to facilitate the methanation process to produce methane. The methane is stored in a gas storage tank, then a GfG unit is supplied with the gas to participate frequency regulation. Secondly, a novel optimization model using particle swarm optimization is presented considering the operating strategy and operation constraints to maximize net benefit when CPGS participates frequency regulation market. Finally, case studies were conducted to verify the proposed coordinated operation and optimal sizing strategy considering actual AGC commands and curtailed wind power data.

关键词： P2G Gas storage tank GfG unit Optimal sizing Frequency regulation

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Soft-Switched Three-Port DC-DC Converter With Simple Auxiliary Circuit

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IEEE ACCESS 2021年 9卷 66738-66750页

作者： Faraji, Rasoul Ding, Lei Rahimi, Tohid Kheshti, Mostafa Islam, Md. Rabiul Shandong Univ Minist Educ Sch Elect Engn Key Lab Power Syst Intelligent Dispatch & Control Jinan 250061 Peoples R China Univ Wollongong Sch Elect Comp & Telecommun Engn Wollongong NSW 2522 Australia

In this paper, a new high efficiency soft-switching non-isolated three-port converter (TPC) is proposed. In the conventional TPC, three switches are required to process power in different directions between inputs and output. Providing soft-switching condition for all switches using a low number of auxiliary components is a challenging task. In this paper, the conventional TPC topology is modified by changing its structure and adding a simple auxiliary circuit such that all switches operate under soft-switching condition in all operating modes. To reduce the volume of the converter, the magnetic components are integrated using a coupled inductor in the auxiliary soft-switching cell. In this paper, various converter operating modes are presented, and design considerations are discussed. Finally, a prototype 200 W, 100 V converter is implemented in the laboratory, and the theoretical analysis is validated by the experimental results.

关键词： Switches Batteries Inductors Zero voltage switching Clamps Topology Soft switching Distributed energy systems dc-dc converters soft-switching hybrid power systems multi-input converter

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Time Integration-Based IGD Methods for Eigen-Analysis of Large Delayed Cyber-Physical power system

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IEEE TRANSACTIONS ON power systemS 2020年第2期35卷 1376-1388页

作者： Ye, Hua Li, Tairan Liu, Yutian Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250061 Peoples R China

Two spectral discretization methods based on linear multistep and implicit Runge-Kutta discretization of infinitesimal generator (IGD-LMS/IRK) are presented in this paper for eigen-analysis of large delayed cyber-physical power system (DCPPS) with large time delays. First, the whole delay interval is partitioned into several sub-intervals by time delays in the system. The piecewise partitioning allows the avoidance of interpolations in evaluating system states at the delay points. Second, two time integration methods, i.e., LMS and IRK, are utilized to discretize infinitesimal generator on each sub-interval, resulting in highly structured and sparse discretization matrices. Third, IGD-LMS/IRK are efficiently implemented to compute the system's electromechanical oscillation modes. The shift-invert preconditioning technique is used and the sparsity in augmented system state matrices is exploited to guarantee the efficiency and scalability of IGD-LMS/IRK in dealing with large DCPPS. Numerical results on the two-area four-machine test system and a real-life large transmission grid validate the improved efficiency and accuracy of the proposed methods in analyzing DCPPS with large time delays.

关键词： Cyber-physical power system eigen-analysis low frequency oscillation small signal stability spectral discretization time delay wide-area damping control wide-area measurement system

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Enabling Highly Efficient Eigen-Analysis of Large Delayed Cyber-Physical power systems by Partial Spectral Discretization

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IEEE TRANSACTIONS ON power systemS 2020年第2期35卷 1499-1508页

作者： Mou, Qianying Ye, Hua Liu, Yutian Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250061 Peoples R China

The existing spectral discretization-based methods (SDMs) are capable of accurately computing critical eigenvalues of large power systems when time delays in wide-area damping control loops are considered. However, SDMs suffer from huge dimension of the discretized matrices of spectral operators, which is usually dozens of times of actual system states. To resolve the problem, an idea of partial spectral discretization (PSD) is proposed in this paper where only the retarded state variables instead of all system states are discretized. Following the PSD idea, a partial and explicit infinitesimal generator discretization (PEIGD) method is presented for highly efficient eigen-analysis of large closed-loop delayed cyber-physical power system (DCPPS). In contrast to the original EIGD method, the order of the resultant discretized matrix of the infinitesimal generator is greatly reduced and close to the number of actual state variables. The computational burden of PEIGD can be an order of magnitude less than that of EIGD and nearly the same as eigen-analysis of a system without time delay. Moreover, PEIGD is endowed with exactly the same accuracy as EIGD in capturing critical oscillation modes. Both theoretical analyses and intensive tests on the 16-generator 68-bus test system as well as a 516-bus and a 33028-bus real-life large power systems verify the accuracy and efficiency of the presented method.

关键词： Cyber-physical power system eigen-analysis order reduction small signal stability spectral discretization time delay wide-area damping control wide-area measurement system

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Localization Approach for Forced Oscillation Source Based on Synchrosqueezed Wavelet

Localization Approach for Forced Oscillation Source Based on...

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IEEE International Conference on Electrical Engineering, Big Data and Algorithms (EEBDA)

作者： Xu, Bosong Cao, Yongji Zhang, Hengxu Wang, Yuehan Ruan, Jiacheng Zhao, Kang Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan Peoples R China Tech Univ Denmark Dept Elect Engn Lyngby Denmark State Grid Shandong Elect Power Co State Grid Shandong Elect Power Res Inst Jinan Peoples R China

ISBN: (纸本)9781665416061

The localization of forced oscillation sources is of great significance for power system stability. This paper proposes a localization approach based on synchrosqueezed wavelet. First, the wide-area measurement data is processed by synchrosqueezed wavelet to extract oscillation mode parameters. Moreover, the dissipated energy flow of each generator is calculated based on the extracted mode parameters. In addition, according to the direction of dissipated energy flow, the forced oscillation source is localized. Finally, the WECC 240-bus system is used to verified the effectiveness of the proposed approach.

关键词： forced oscillation disturbance source location synchrosqueezed wavelet dissipating energy flow

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Bi-Level control Strategy for EV Charging in Active Distribution Network Based on Wavelet Decomposition

Bi-Level Control Strategy for EV Charging in Active Distribu...

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IEEE International Conference on Electrical Engineering, Big Data and Algorithms (EEBDA)

作者： Cao, Yongji Xu, Qingwen Zhang, Hengxu Xu, Bosong Ruan, Jiacheng Yang, Dong Tech Univ Denmark Dept Elect Engn Lyngby Denmark Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan Peoples R China State Grid Shandong Elect Power Co State Grid Shandong Elect Power Res Inst Jinan Peoples R China

ISBN: (纸本)9781665416061

Considering the increasing integration of distributed renewable energies (DREs), the active distribution network (ADN) is facing challenges to maintain generation-load balance. Meanwhile, since the electric vehicles (EVs) are usually charged together in time and space, the EV charging is typical impulsive load and may further aggravate power imbalance. A bi-level EV charging strategy is proposed to reduce the adverse impacts of DRE power fluctuation and EV power impulse on ADN. In the outer level, a multi-objective optimization model is provided based on the predicted DRE power. With the objectives of minimizing net power fluctuations and EV charging power changes, the optimal Pareto solution set is obtained through the multi-objective particle swarm optimization algorithm, on which a basic EV charging scheme in the large time scale is determined. Then, in the inner level, the wavelet decomposition is utilized to extract the high-frequency power prediction errors. According to the high-frequency components and the state of charge of EVs, the charging scheme is adjusted in a small-time scale.

关键词： active distribution network bi-level optimization EV charging wavelet decomposition

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