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5th IEEE International electrical and Energy Conference, CIEEC 2022

作者： Wang, Yixuan Liu, Dan Wei, Xiaoguang Qi, Lei Wang, Xinyin Lin, Zhiguang North China Electric Power University State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources Beijing China Hubei Electric Power Research Institute State Grid Corporation of China Wuhan China State Grid Smart Grid Research Institute Co. Ltd State Grid Corporation of China Beijing China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

The existing hybrid modular multilevel fast equivalent modeling based on Thevenin does not consider insufficient capacitor voltage, resulting in incorrect simulation results of electromagnetic transient simulation when the capacitor voltage is insufficient. Therefore, a hybrid modular multilevel fast equivalent modeling is proposed in this paper. Specifically, the transformer is T-shaped equivalent, the components of each sub module are discretized by trapezoidal integral method. The single port Thevenin equivalent of half bridge sub module and the double port Thevenin equivalent of hybrid sub module are obtained by Stepwise calculation of Thevenin equivalent of local circuit. Then the equivalent model of hybrid modular multilevel converter is established. The validity and accuracy of the model are verified in MATLAB Simulink. © 2022 IEEE.

关键词： power converters

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Robust Voltage Control Considering Uncertainties of Renewable Energies and Loads via Improved Generative Adversarial Network

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Journal of Modern power systems and Clean Energy 2020年第6期8卷 1104-1114页

作者： Qianyu Zhao Wenlong Liao Shouxiang Wang Jayakrishnan Radhakrishna Pillai the Key Laboratory of Smart Grid of Ministry of Education and Tianjin Key Laboratory of Power System Simulation and Control Tianjin UniversityTianjinChina the Department of Energy Technology Aalborg UniversityAalborgDenmark

The fluctuation of output power of renewable energies and loads brings challenges to the scheduling and operation of the distribution *** this paper,a robust voltage control model is proposed to cope with the uncertainties of renewable energies and loads based on an improved generative adversarial network(IGAN).Firstly,both real and predicted data are used to train the IGAN consisting of a discriminator and a *** noises sampled from the Gaussian distribution are fed to the generator to generate a large number of scenarios that are utilized for robust voltage control after scenario ***,a new improved wolf pack algorithm(IWPA)is presented to solve the formulated robust voltage control model,since the accuracy of the solutions obtained by traditional methods is *** simulation results show that the IGAN can accurately capture the probability distribution characteristics and dynamic nonlinear characteristics of renewable energies and loads,which makes the scenarios generated by IGAN more suitable for robust voltage control than those generated by traditional ***,IWPA has a better performance than traditional methods in terms of convergence speed,accuracy,and stability for robust voltage control.

关键词： Robust voltage control uncertainty generative adversarial network wolf pack algorithm

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Low-Frequency Offshore Wind power Transmission system with Dual-End grid-Forming Control

Low-Frequency Offshore Wind Power Transmission System with D...

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International Conference on Renewable Energy and power Engineering (REPE)

作者： Nan Fu Bao Liu Yunfei Xu Sitong Zhu Kui Wang Yongdong Li State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Beijing China Electric Power Research Institute of State Grid Liaoning Electric Power Co. Ltd. Shenyang China

ISBN: (数字)9798350375558

ISBN: (纸本)9798350375565

The offshore wind power has been gaining increasing attention in recent years. Low-frequency alternating current (LFAC) transmission is emerging as a promising technology with specific advantages for offshore wind power transmission. This paper discusses the structure and control of the offshore wind power transmission system based on LFAC. In order to enhance the support for the power system, grid-forming control can be implemented on both sides of the modular multilevel matrix converter (M3C) used in LFAC. Additionally, the capacitor voltage control of M3C is briefly introduced. Furthermore, power reserve control is utilized to enable wind turbines to participate in primary frequency regulation. Finally, the effectiveness of the designed control system is verified through simulation using PSCAD/EMTDC, further demonstrating the efficacy of the strategy.

关键词： Current control Capacitors Wind power generation Wind farms Control systems Wind turbines Voltage control Matrix converters Frequency control grid forming

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A Storage and Transmission Joint Planning Method for Centralized Wind power Transmission

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Computers, Materials & Continua 2021年第7期68卷 1081-1097页

作者： Xiuyu Yang Qi Guo Jianzhong Gui Renyong Chai Xueyuan Liu Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology(Northeast Electric Power University) Jilin132012China Electrical Engineering-PHD program at the University of Idaho Idaho83843America State Grid Jiangxi Power Supply Company Xinyu338025China

Centralized delivery has become the main operation mode under the scaled development of wind *** channels are usually the guarantee of out-delivered wind power for large-scale wind *** configuration of transmission capacity,which has the features of low utilization and poor economy,is hardly matching correctly due to the volatility and low energy density of *** usage of energy storage can mitigate wind power fluctuations and reduce the requirement of out-delivery transmission capacity,but facing the issue of energy storage cost ***,it is necessary to optimize the allocation of energy storage while considering the problem of wind power *** paper studies the joint optimization of large-scale wind power transmission capacity and energy storage,reveals the mechanism of energy storage in order to reduce the power fluctuation of wind power base and slow down the demand of ***,analyze the multi-functional cost-sharing mode of energy storage,improve the efficiency of energy storage cost *** the coordination optimization configuration model to deal with the problem of large-scale wind power transmission capacity and energy storage,and realizes the transmission capacity optimization coordination and optimization with energy *** proposed method is verified by a wind base located in Northeast China.

关键词： Wind farm group energy storage configuration transmission capacity coordination and optimization

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Data-driven Transient Stability Assessment Model Considering Network Topology Changes via Mahalanobis Kernel Regression and Ensemble Learning

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Journal of Modern power systems and Clean Energy 2020年第6期8卷 1080-1091页

作者： Xianzhuang Liu Xiaohua Zhang Lei Chen Fei Xu Changyou Feng State Grid Corporation of China State Grid Jibei Electric Power Company the State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical EngineeringTsinghua University

Transient stability assessment(TSA)is of great importance in power system operation and *** of the usual tasks in TSA is to estimate the critical clearing time(CCT)of a given fault under the given network topology and pre-fault power ***-driven methods try to obtain models describing the mapping between these factors and the CCT from a large number of ***,the influence of network topology on CCT is hard to be analyzed and is often ignored,which makes the models inaccurate and *** this paper,a novel data-driven TSA model combining Mahalanobis kernel regression and ensemble learning is proposed to deal with the *** model is a weighted sum of several *** sub-model only uses the data of one topology to construct a kernel *** weights are determined by both the topological similarity and numerical similarity between the *** similarities are decided by the parameters in Mahalanobis distance,and the parameters are to be *** reduce the model complexity,sub-models within the same topology category share the same *** estimating CCT,the model uses not only the sub-model which the sample topology belongs to,but also other ***,it avoids the problem that there may be too few data under some *** also efficiently utilizes information of data under all the ***,its decision-making process is clear and understandable,and an effective training algorithm is also *** results on both the IEEE 10-machine 39-bus and a real system verify the effectiveness of the proposed model.

关键词： Transient stability assessment critical clearing time network topology change Mahalanobis kernel regression ensemble learning data-driven

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A review of PETT oscillation's characteristics, mechanism, and suppression methods in the IGBT device

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power Electronic Devices and Components 2023年 4卷

作者： Feng, Ganyu Li, Xuebao Tang, Xinling Wei, Xiaoguang Zhao, Zhibin State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing102206 China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China

In practical application, there are many parallel insulated gate bipolar transistor (IGBT) chips and anti-parallel fast recovery diode (FRD) chips in the IGBT devices. Because of the interactions between parasitic inductance and chip capacitance, plasma extraction transit time (PETT) oscillation might raise during the operation of IGBT device. The PETT oscillation, whose frequency ranges from 1 MHz to 700 MHz, may induce interference on driver circuits, and then cause the device failure. Moreover, the electromagnetic disturbance will affect the secondary devices. Therefore, it should be seriously considered in the design of the packaging to suppress PETT oscillation. The mechanism of PETT oscillation is complex, and its electrical characteristics are sensitive to the chip's parameters, load current, and DC link voltage. Hence, PETT oscillation is an important problem to be solved in device packaging design. In this paper, the characteristics, mechanism, and suppression methods of PETT oscillation are summarized. Based on the systematic summary, various suppression methods are compared and analyzed. Furthermore, the future research issues are prospected. © 2022 The Author(s)

关键词： Capacitance

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Damping Torque Analysis of the PLL Low-Frequency Components for grid Following VSG

Damping Torque Analysis of the PLL Low-Frequency Components ...

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2022 International Conference on Cyber-Physical Social Intelligence, ICCSI 2022

作者： Zhou, Yichen Li, Sha Sun, Jiahui Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Electrical and Electronic Engineering North China Electric Power University Jilin China Guangdong Power Grid Corporation Dongguan Power Supply Bureau China Southern Power Grid Guangdong Dongguan China North China Electric Power University Electrical and Electronic Engineering Hebei Baoding China

ISBN: (数字)9781665498357

ISBN: (纸本)9781665498357

Phase-locked loop (PLL) is the key tool for the grid-connected inverter to track the frequency and phase of the grid voltage when synchronizing with the power grid. Therefore, the stability of PLL is particularly important. This paper proposes a damping torque analysis method to study the stability of the low-frequency component of PLL for the grid following a virtual synchronous generator (VSG). Firstly, the small signal model is established for the grid following VSG with a dual-loop structure. Secondly, the damping torque analysis method is provided especially for the stability analysis of PLL low-frequency components. And the corresponding stability criterion is constructed. Finally, significant factors that affect the stability of PLL low-frequency components are studied by the test system and the corresponding mechanism is revealed, including the influence of line reactance, PLL control parameters, and virtual damping. Results show that the stability of PLL is greatly dominated by the low-frequency component, whose stability can be improved by adopting a smaller integral coefficient of PLL, smaller virtual inertia, and larger virtual damping D. © 2022 IEEE.

关键词： Stability criteria

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A Data-Driven Method for Fast Calculation of Electromagnetic Radiation Field of Flexible HVDC Converter Valves

A Data-Driven Method for Fast Calculation of Electromagnetic...

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Frontiers of power and Energy (ACFPE), Asian Conference on

作者： Haijun Tang Minhua Xie Qin Qin Shuncheng Wang Wei Bao Minghui Su State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China Beijing Key Laboratory of DC Grid Technology and Simulation State Grid Smart Grid Research Institute Co. Ltd. Beijing China State Grid Shanghai Electric Power Research Institute State Grid Shanghai Municipal Electric Power Company Shanghai China Department of Electrical Engineering North China Electric Power University Baoding China

ISBN: (数字)9798350367676

ISBN: (纸本)9798350378467

In order to solve the problem of time-consuming computation of electromagnetic radiation field on specific planes of flexible HVDC converter valves, this paper proposes a fast calculation method which combines Proper Orthogonal Decomposition (POD) and Radial Basis Function Response Surface method with Linear Polynomial(RBFLP) to improve the calculation efficiency. To validate the accuracy and practicality of this method, a three-phase MMC converter valve antenna model was constructed. The excitation of the antenna model are the spectral quantities of the MMC valve currents and voltages transformed from the time domain. And the calculation results on any field plane will be predicted from the known simulation results on discrete planes from available software. The results show that the maximum absolute error in the test conditions between the reduced-order prediction data and the available software simulation data is 1.1326. And the absolute error gradually decreases as the distance increases. Therefore, this method is suitable for fast calculation of electromagnetic radiation field where efficiency is necessary more than accuracy. Since the results are needed for only a few discrete planes, the simulation of all the needed planes is avoided, especially if there are many needed planes, which is convenient and efficient.

关键词： Accuracy HVDC transmission simulation Electromagnetic radiation Predictive models Valves Software Reduced order systems Response surface methodology Time-domain analysis

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Transient Voltage Stability Assessment Method based on gcForest

Transient Voltage Stability Assessment Method based on gcFor...

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2021 International Conference on electrical, Electronics and Computing Technology, EECT 2021

作者： Zhiyuan, Sun Mingpo, L.I. Jie, Zhang Binjiang, Hu Guo, Qi Yihua, Zhu Guangxi Power Grid Electrical Power Research Institute China State Key Laboratory of HVDC Electric Power Research Institute CSG China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System China CSG Key Laboratory of Power System Simulation

Aiming at the fact that the traditional method cannot quickly and accurately judge the power system transient voltage stability, and the deep neural network method needs many sample data sets and has a large number of hyperparameters, a power system transient voltage stability assessment method based on deep forest (gcForest) is proposed. gcForest effectively extracts features through ensemble learning, multi-layer feature transformation, and dynamically adjusting the number of model layers. Finally, this method is applied to transient voltage stability assessment of an electrolytic aluminium load-intensive area in Guangxi power grid. The results show that the method has high accuracy, the feasibility and effectiveness of this method are verified. This method can assist dispatchers to judge the transient voltage stability of the power grid. © Published under licence by IOP Publishing Ltd.

关键词： Deep neural networks

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High Temperature and Electric Field Dependence of Resistivity in Impregnated Polypropylene Film

High Temperature and Electric Field Dependence of Resistivit...

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electrical Engineering and Automation (IFEEA), International Forum on

作者： Xinghui Zhang Fanqiu Zeng Shaowei Guo Zhaoliang Xing Chong Zhang Chunjia Gao Bo Qi Huize Cui State Key Laboratory of Advanced Power Transmission Technology (State Grid Smart Grid Research Institute Co. Ltd.) State Grid Corporation of China Beijing China State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources North China Electric Power University Beijing China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China State Key Laboratory of Advanced Power Transmission Technology (State Grid Smart Grid Research Institute Co. Ltd.) State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources North China Electric Power University Beijing China

Biaxially oriented polypropylene film (BOPP) and benzyltoluene are the dominant insulating media in high-voltage capacitors. In order to investigate the electrical performance of impregnated film materials, this paper builds a polypropylene film volume resistivity test platform, which conducts tests for five thicknesses of the film to obtain the change rules of impregnated film in different temperature and field strength. Test result shows that: 1) Volume resistivity decreased after impregnation. At room temperature, the volume resistivity of 13 μm impregnated film decreases from 1.83×10 16 Ω m to 1.71×10 16 Ω m. 2) Impregnated film is significantly affected by high temperature and electric field. When field strength increases from 10 MV/m to 100 MV/m at room temperature, volume resistivity of the impregnated film decreases from 7% to 17% compared with the dry film. When temperature increases to 353 K and field strength increases to 300 MV/mm, volume resistivity of the impregnated film decreases by more than 30%. 3) The variation of volume resistivity of polypropylene film with temperature and field strength can be described by hopping model. At room temperature, the electron hopping distance increases from 1.3 nm to 1.4 nm, and at 353 K, impregnation makes electron hopping distance increase from 1.8 nm to 2.8 nm. The study of the change rules of the impregnated film at high temperatures and fields can help to establish a more accurate capacitor electro-thermal model.

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