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17th Annual Conference of China Electrotechnical Society, CES 2022

作者： Gu, Qianshuo Cong, Wei Wang, Feng Li, Yiquan Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Jinan250000 China Power Dispatching Control Center of Guangdong Power Grid Co. Ltd. Guangzhou China

ISBN: (纸本)9789819903566

In order to solve the problem of current transformer (CT) reverse connection in power system, this paper proposes a method to judge CT polarity by fitting line parameters with closing transient current. Firstly, the relationship between line parameters and current is studied by deducing the mathematical form of closing current. By using the least square method to fit the sampling values of closing current, the line parameters are obtained. Compare the fitted line parameters with the actual line parameters. If the fitting result is consistent with the actual result, the CT polarity is correct;If the fitting result is contrary to the actual result, the CT polarity is reverse. In order to improve the accuracy of least square fitting, this paper uses matrix pencil algorithm to extract waveform features and realize decoupling among line parameters. Then, the differential equation of closing current is modified, and the remaining parameters are fitted and solved by the least square method. Finally, considering different operating environment and closing angle, the above algorithm is simulated by PSCAD and MATlab. The simulation results show that when some sampling points are offset, the line parameters fitted by the matrix pencil algorithm are still consistent with the actual parameters. Therefore, the matrix pencil algorithm effectively improves the stability of the method and meets the needs of practical engineering. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Differential equations

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Uneven internal time-step adjustment for fast power system dynamic simulations based on Trapezoidal integration of elementary transfer function blocks

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INTERNATIONAL JOURNAL OF ELECTRICAL power & ENERGY systemS 2024年第PartA期155卷

作者： Li, Changgang Hang, Yun Liu, Yutian Terzija, Vladimir Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ 17923 Jingshi Rd Jinan 250061 Peoples R China Newcastle Univ Sch Engn Newcastle Upon Tyne NE1 7RU England

With the development of renewable energy sources, the scale and complexity of power systems are continuously increasing, resulting in a high requirement for the efficiency of dynamic simulation. Increasing the simulation time-step is a possible measure for the fixed time-step (FTS) method to accelerate the simulation, yet also a potential cause for deteriorating the simulation accuracy. To improve the overall power system dynamic simulation speed without jeopardizing the expected accuracy, this paper proposes a novel Uneven Internal Time -Step Adjustment method based on Trapezoidal integration of elementary transfer function blocks (ETFBs). For ETFBs with different time constants, three different integration modes are defined, including single-step integration, multiple-step integration, and static approximation. Each ETFB can select an appropriate integration mode and adjust its internal time-step, automatically expanding the size of the simulation time-step. Implementation of static approximation for ETFBs with small time constants is given. Discussion on the determination of threshold values of internal time-step is provided, which mainly affect the accuracy of the system. The pro-posed method is applied to the open-source Simulation Toolkit for Electrical power systems (STEPS). Different cases are tested to obtain the maximum simulation time-step that can maintain numerical stability and validate the efficiency and accuracy of the proposed method.

关键词： power system Dynamic Simulation time -step Trapezoidal integration

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Mid-Iong Term Photovoltaic power Forecasting Method Considering Periodicity Characterization

Mid-Iong Term Photovoltaic Power Forecasting Method Consider...

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2024 IEEE IAS Industrial and Commercial power system Asia, I and CPS Asia 2024

作者： Zhuo, Minyi Yang, Ming Li, Peng Sun, Yi Liu, Rui Zheng, Zhijie Shi, Bingke Shandong University Key Laboratory of Power System Intelligent Dispatch and Control Jinan China Economic & Technology Research Institute State Grid Shandong Electric Power Company Power Grid Planning Research Department Jinan China

ISBN: (纸本)9798350352290

Accurate forecasting of mid-long term photovoltaic power plays a key role in site planning, operation scheduling and mid-long term plan development for new power system. Meanwhile, the uncertainty in solar power generation is a key factor influencing the precision of its forecasting. This paper proposes a mid-long term PV power forecasting method considering periodic characterization, which first obtains the key meteorological factors through the maximal information coefficient, and extracts the timing features through ARIMA model for mid-long term PV power periodic component prediction. Then the results obtained from above are inputted to the LSTM model, which is trained using raw data to obtain the final PV power prediction results with high accuracy. Validation is carried out through the model's RMSE, MAE and MAPE metrics and the comparison of the model's forecasting results with traditional GRU model. © 2024 IEEE.

关键词： Solar power generation

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Transient Stability of power Synchronization Loop Based Grid Forming Converter

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IEEE TRANSACTIONS ON ENERGY CONVERSION 2023年第4期38卷 2843-2859页

作者： Li, Yujun Lu, Yiyuan Yang, Jialun Yuan, Xiaotian Yang, Rui Yang, Songhao Ye, Hua Du, Zhengchun Xi An Jiao Tong Univ Sch Elect Engn Xian 710049 Peoples R China Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan 250061 Peoples R China

Previous studies regards that the grid-forming (GFM) converter switches from the constant voltage control (CVC) to the current limiting control (CLC) at the point of intersection of the unsaturated and saturated power-angle curves, which might not be held in most situations. This article firstly derives the switching rule of GFM converter between two controls from the current limiting inequality. Accordingly, the conventional algebraic-variable switched model is transferred to the proposed state-variable switched model. Based on Lyapunov Theory, the stability of equilibrium points (EPs) is studied and the stable regions under two controls are further derived. In addition, one necessary stabilizing condition for the power synchronization loop based GFM (PSL-GFM) converter being locked in CLC is derived. As a result, one global stabilization on CVC is proposed by regulating the angle between the saturated current vector and d-axis. Finally, the maximum system boundary of the first swing can be obtained by placing stable equilibrium points (SEPs) under CLC on the right switching line.

关键词： PSL GFM converter switched dynamic system current limiting control saturated current angle

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Synchronization Stability Analysis of Wind Farms Integrated MMC-HVDC system

Synchronization Stability Analysis of Wind Farms Integrated ...

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2023 International Conference on power system Technology, powerCon 2023

作者： Li, Li Qin, Changlong Kan, Changtao Yang, Jialun Li, Guanqun State Grid Jinan Power Supply Company Jinan China Shandong University Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Jinan China

ISBN: (纸本)9798350300222

High-voltage direct current (HVDC) based on modular multilevel converter (MMC) is an efficient way to integrate wind farms. However, following short-circuit fault on transmission line, wind turbines (WTs) may lose synchronization with sending-end MMC. As a result, delivery and consumption of wind power are under risk. This paper investigates the mechanism of synchronous instability of wind farm integrated MMC-HVDC system under the severe grid faults. First, a synchronization stability model of the whole is stablished, the existing of stable equilibrium points (SEPs) and the damping characteristic of the whole system are analyzed. Then, a synchronization stability enhancement strategy is proposed based on the coordination of WT and MMC. Last, the effectiveness of proposed strategy is verified by time-domain simulation. © 2023 IEEE.

关键词： Transient analysis

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A Missing Data Imputation Method for Electricity Consumption Data Based on TCN-Attention with Mask Tokens 4

A Missing Data Imputation Method for Electricity Consumption...

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4th International Conference on Consumer Electronics and Computer Engineering, ICCECE 2024

作者： Mao, Yifeng Yang, Ming Li, Peng Ou, Zhujian Shandong University Key Laboratory of Power System Intelligent Dispatch and Control Jinan China State Grid Nantong Power Supply Company State Grid Jiangsu Electric Power CO. LTD. Nantong China

ISBN: (纸本)9798350384062

With the popularization of smart meters, power companies can collect massive amounts of data from users for non-invasive load detection, electricity theft detection, etc. However, due to faults in smart meters and abnormal communication, the dataset often has missing values, making it difficult for data-driven methods to be widely applied. In this paper, we propose an unsupervised learning method based on TCN-Attention to fill in customers' electricity consumption data. Firstly, we extract electricity consumption features through TCN. In order to improve the feature extraction capability, we introduce a channel attention mechanism to TCN. The attention mechanism makes TCN focus on the effective features in the data by assigning weights. Meanwhile, we use mask tokens to cover a certain proportion of data, forcing the proposed model to learn potential feature representations of the data during the training process. Finally, the features are restored to data through feedforward neural networks. An example is given to verify the effectiveness of the proposed method. © 2024 IEEE.

关键词： Smart meters

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A Pilot Protection Method for Active Distribution Networks Based on Protected Line Model

A Pilot Protection Method for Active Distribution Networks B...

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58th IEEE/IAS Industrial and Commercial power systems Technical Conference Asia (IEEE I and CPS Asia)

作者： Wang, Zeclian Cong, Wei Chai, Qingfa Lv, Jing Chai, Yanan Control Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Jinan Peoples R China

ISBN: (数字)9781665450669

ISBN: (纸本)9781665450669

After Distributed Generations were connected to the distribution network on a large scale, the traditional singleended radial distribution network structure became an active distribution network structure, which affected the sensitivity and reliability of traditional protection methods. Therefore, a new pilot protection method for active distribution network based on the protected line model is proposed in this paper, which determines whether the protected line model is integrity according to whether the waveforms are similar. The protection units on both sides of the line compare the waveform similarity between the respective measured voltages and the referenced voltages, then compare the fault location judgment results on both sides, and then make an accurate judgment on whether the protected line has internal or external faults. Finally, the active distribution network model was built in PSCAD/EMTDC simulation software. The simulation results show that the method proposed in this paper can accurately identify internal and external faults, has high reliability and good applicability, and is less affected by noise.

关键词： active distribution network protected Line model cosine similarity fault detection pilot protection

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Coordinated control strategy for active support of power on multiple scenarios in doubly-fed wind power and synchronous generator bundled delivery system 3

Coordinated control strategy for active support of power on ...

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3rd International Conference on Energy and Electrical power systems (ICEEPS)

作者： Ling, Wuneng Liang, Zhencheng Xiong, Li Liang, Yangdou Wu, Yin Deng, Qiuquan Liang, Zhuohang Li, Chengxiang Guangxi Power Grid Dispatch & Control Ctr Nanning Peoples R China China Southern Power Grid Guangdong Prov Key Lab Intelligent Operat & Contr Elect Power Res Inst Guangzhou Peoples R China

ISBN: (纸本)9798350375145;9798350375138

Aiming at the problem of poor frequency characteristics of the delivery island in the case of large-scale wind power and synchronous generator bundled via Ultra-high-Voltage Direct Current (UHVDC) transmission system, a coordinated control strategy is proposed for doubly-fed wind power and synchronous generator to jointly support the frequency of the delivery system, and The frequency modulation setpoint for doubly-fed wind power is crafted to flexibly switch its active support mechanism in response to different scenarios., and effectively improves the frequency stability of the delivery island system of wind power and synchronous generator bundled with the wind power and the synchronous generator. Using RTlab, we constructed a simulation model integrating large-scale doubly-fed wind power and synchronous generators coupled with a DC transmission system. This model validates the efficacy of the control strategy proposed in this study..

关键词： component Doubly-fed wind turbine Synchronous generator Bundled systems Coordinated control Frequency stability

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Impact assessment for large-scale off-grid of renewable energy on weakly interconnected systems 6

Impact assessment for large-scale off-grid of renewable ener...

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6th IEEE International Electrical and Energy Conference, CIEEC 2023

作者： Li, Li Qin, Changlong Dong, Xin Qiao, Rongfei Yang, Jialun State Grid Jinan Power Supply Company Jinan China Shandong University Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Jinan China

ISBN: (纸本)9798350346671

Under the background of increasingly serious off-grid problems of renewable energy, this paper analyzes the impact of large-scale off-grid of renewable energy and voltage stability in the weakly interconnected system. First, an improved index is proposed based on Simpson formula for assessing transient voltage stability and achieving early warning of instability risk. Then, based on the simulation of a real-life UHV (Ultra-high voltage) weakly interconnected system, two typical cascading failure scenarios are reasonably anticipated. These cascading failures contain a series of renewable energy off-grid and blocking of DC transmission caused by different initial failures, whose voltage stability is evaluated by the proposed index. Besides, the nature of cascading failure evolution is analyzed. Finally, accuracy and efficient of the proposed index are verified. © 2023 IEEE.

关键词： Transients

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Preventive control Method of Improving Transient Voltage Stability for power system Based on the Attention of CNN

Preventive Control Method of Improving Transient Voltage Sta...

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2023 IEEE Sustainable power and Energy Conference, iSPEC 2023

作者： Li, Zhendong Yan, Jiongcheng Liu, Yutian Li, Li Qu, Hanbing The Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China State Grid Jinan Power Supply Company Jinan China

ISBN: (纸本)9798350322699

The widespread integration of renewable generation and the changes in load structure bring significant challenges to the transient voltage stability of large-scale power systems. In order to achieve fast decision of preventive control for improving transient voltage stability, this paper proposes a preventive control method based on the attention of Convolutional Neural Network (CNN). An optimization decision model is established, which not only considers multiple traditional constraints but also introduces the model attention indicator based on Gradient-weighted Class Activation Mapping (Grad-CAM), enabling a more targeted improvement of transient voltage stability. The proposed indicator is capable of extracting the knowledge learned by CNN-based transient voltage assessment model, and utilizing it to guide the optimization decision-making of preventive control. Simulation results of provincial grid of eastern China demonstrate that the optimized control scheme can effectively enhance the transient voltage stability of power systems. © 2023 IEEE.

关键词： model attention indicator power system preventive control transient voltage stability

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