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10th IEEE International power Electronics and Motion Control Conference, IPEMC 2024 ECCE Asia

作者： Chen, Qi Xu, Yunfei Zhao, Guoliang Qi, Lei Ding, Chao State Grid Smart Grid Research Institute Co. Ltd State Key Laboratory of Advanced Power Transmission Technology Beijing China North China Electric Power University State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources Beijing China State Grid Zhejiang Electric Power Co. Ltd Research Institute Hangzhou China

ISBN: (纸本)9798350351330

The modular multi-level matrix converter (M3C) is a crucial component of the flexible low-frequency transmission system. However, during AC-AC frequency conversion, the power of the AC system on both sides, with different frequencies, is directly coupled in the inverter. The converter bridge arm is subjected to two different frequencies of AC currents simultaneously, resulting in irregular thermal cycling on the power semiconductor device, which causes the IGBT junction temperature fluctuation to be more violent and complex, thereby accelerating its aging and reducing the overall reliability of the converter. In this paper, simulations based on thermal network and electro-thermal models are built to calculate the junction temperature of the IGBTs within the submodules on each bridge arm of the M3C, and their waveform characteristics are analysed, and then the rain-flow counting method is used to extract the thermal load of the IGBTs in one cycle, which contains three important parameters used for the life analysis. © 2024 IEEE.

关键词： Junction temperature

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Flexible linear clock-based distributed self-triggered active power-sharing secondary control of AC microgrids

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Global Energy Interconnection 2024年第6期7卷 786-797页

作者： Yulin Chen Xing Huang Guangxin Zhi Shaohua Yang Hongxun Hui Donglian Qi Yunfeng Yan Fengkai Gao Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology Ministry of Education(Northeast Electric Power University)Jilin132012P.R.China Hainan Institute Zhejiang UniversitySanya572000P.R.China College of Electrical Engineering Zhejiang UniversityHangzhou310027P.R.China State Key Laboratory of Internet of Things for Smart City University of MacaoMacao999078P.R.China

Traditional active power sharing in microgrids,achieved by the distributed average consensus,requires each controller to continuously trigger and communicate with each other,which is a wasteful use of the limited computation and communication resources of the secondary *** enhance the efficiency of secondary control,we developed a novel distributed self-triggered active power-sharing control strategy by introducing the signum function and a flexible linear *** continuous communication–based controllers,the proposed self-triggered distributed controller prompts distributed generators to perform control actions and share information with their neighbors only at specific time instants monitored by the linear ***,this approach results in a significant reduction in both the computation and communication ***,this design naturally avoids Zeno ***,a modified triggering condition was established to achieve further reductions in computation and *** simulation results confirmed that the proposed control scheme achieves distributed active power sharing with very few controller triggers,thereby substantially enhancing the efficacy of secondary control in MGs.

关键词： Active power sharing Distributed secondary control Self-triggered mechanism AC microgrid Control efficiency

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Arm Inductor and Modulation Index Design of Full-bridge Modular Multilevel Converters for Capacitor Voltage Ripples Reduction 10

Arm Inductor and Modulation Index Design of Full-bridge Modu...

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10th Renewable power Generation Conference, RPG 2021

作者： Zhang, Wei Zhong, Ming Lian, Jie Minfu, A. Inner Mongolia Power Research Institute Inner Mongolia Enterprise Key Laboratory of Smart Grid Simulation of Electrical Power System Hohhot China

ISBN: (纸本)9781839536069

In case of over-modulation operations, the full-bridge submodule (FBSM) capacitance of FBSM-based modular multilevel converters (FB-MMCs) can be reduced significantly. However, the filter inductance, including the arm inductance and the leakage inductance of a transformer, has a great impact on the FBSM voltage fluctuations. This paper analyzes the FBSM voltage ripples characterization of the FB-MMC with consideration of the filter inductance, and the analysis results show that the fundamental frequency component, which is dominant in the FBSM voltage fluctuations, can almost be completely eliminated by selecting appropriate arm inductor and modulation index. Furthermore, the optimal arm inductor and modulation index are also derived in order to reduce the energy storage requirements. simulation results on a ±160 kV/1000 MW FB-MMC verify the validity of the proposed design method. © The Institution of Engineering and Technology.

关键词： Inductance

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Energy Storage system to Improve Flexible and Stable Operation of Microgrid in grid-connected and Islanding Mode 6

Energy Storage System to Improve Flexible and Stable Operati...

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6th International Conference on power and Renewable Energy, ICPRE 2021

作者： Yuqiang, Wang Rong, Zhu Yue, Mi Dongwei, Jia Pingping, Yun Yongfeng, Ren Inner Mongolia Power Research Institute Inner Mongolia Enterprise Key Laboratory of Smart Grid Simulation of Electrical Power System Hohhot China

ISBN: (纸本)9781665449618

This paper analyzes the wind and solar storage microgrid system including 2 MW wind turbines, 1 MW photovoltaic power generation system and 500 kWh energy storage battery system, and gives a control strategy for the energy management system to follow the load demand response to control the output of the energy storage battery system under grid-connected and islanded operation of the microgrid. The response characteristics of the microgrid subsystem under grid-connected operation and islanding operation are simulated and analyzed in MATLAB/Simulink environment. The results show that the control strategy proposed in this paper can maintain the power balance of the microgrid and realize the flexible and safe operation of the wind and solar storage microgrid. © 2021 IEEE.

关键词： Energy management systems

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An Inertia Adjustment Control Strategy of grid-Forming Electric Vehicle for V2G Application

An Inertia Adjustment Control Strategy of Grid-Forming Elect...

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2022 IEEE Transportation Electrification Conference and Expo, Asia-Pacific, ITEC Asia-Pacific 2022

作者： Li, Hang Han, Junfei Yu, Chaoyu Yin, Zhini Wang, Yuqiang Chen, Min Jiang, Feng Zhang, Yifan Inner Mongolia Electric Power Research Institute Inner Mongolia Enterprise Key Laboratory of Smart Grid Simulation of Electrical Power System Hohhot China Zhejiang University Polytechnic Institute Hangzhou China Zhejiang University College of Electrical Engineering Hangzhou China

ISBN: (数字)9781665492065

ISBN: (纸本)9781665492065

Electric vehicles have gradually become the mainstream means of transportation. As a way of energy storage, electric vehicles can participate in the flexible regulation of grid frequency. However, when a great quantity of electric vehicles are connected to the grid, the stability of the power system will be affected. On the one hand, the way grid-forming electric vehicles output the active power when they participate in grid frequency modulation is introduced. On the other hand, the inertia adjustment strategy is applied to the control of grid-forming electric vehicles, which limits the frequency change rate of inverters and optimizes the dynamic characteristics. Finally, an example of multiple grid-forming electric vehicles participating in power grid regulation is established to verify the control strategy. © 2022 IEEE.

关键词： Vehicle-to-grid

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Control Strategy of Direct-Driven PMSM Wind Turbines Participating in Fast Frequency Response of power grid 6

Control Strategy of Direct-Driven PMSM Wind Turbines Partici...

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6th International Conference on Energy, electrical and power Engineering, CEEPE 2023

作者： Yan, Heming Ji, Feng Pang, Hui Jia, Wenxuan Lin, Chang Pei, Xiangyu State Grid Smart Grid Research Institute Co. Ltd. State Key Laboratory of Advanced Power Transmission Technology Beijing China The College of Electrical and Electronic Engineering North China Electric Power University Beijing China State Grid Smart Grid Research Institute Co. Ltd. Beijing Key Laboratory of DC Grid Technology and Simulation Beijing China

ISBN: (纸本)9798350348279

The large-scale grid connection of wind power brings challenges to the frequency stability of the power system, the system inertia decreases, the frequency regulation capability deteriorates, and the traditional wind turbine is difficult to meet the frequency regulation demand of the system. To address the problem of slow response of existing wind turbines participating in frequency regulation, this paper proposes a control method for permanent magnet direct-driven wind turbines participating in fast frequency response of the grid, based on power electronic converters equipped with electromagnetic level control speed to rapidly change the electromagnetic torque of the wind turbine rotor according to the system frequency change, increase or decrease the wind turbine speed to fully utilize the stored or released rotational inertia and achieve fast power regulation of the wind turbine. The results of the frequency step simulation of the permanent magnet direct-driven synchronous wind power system show that the fast frequency regulation response time of the control method proposed in this paper can reach the millisecond level. © 2023 IEEE.

关键词： Frequency response

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High Temperature and Electric Field Dependence of Resistivity in Impregnated Polypropylene Film 10

High Temperature and Electric Field Dependence of Resistivit...

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10th International Forum on electrical Engineering and Automation, IFEEA 2023

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

ISBN: (纸本)9798350309379

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 1.83×1016 Ω m to 1.71×1016 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. © 2023 IEEE.

关键词： Biaxially oriented polypropylene film impregnation volume resistivity

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Design and Testing of Flexible Security and Stability Control in Industrial power grid 9th

Design and Testing of Flexible Security and Stability Contro...

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9th Frontier Academic Forum of electrical Engineering, FAFEE 2020

作者： Yang, Zaixin Tao, Jun Gao, Chen Inner Mongolia Enterprise Key Laboratory of Smart Grid Simulation of Electrical Power System Inner Mongolia Power Research Institute Hohhot010020 China

ISBN: (纸本)9789813366084

Analyzing the security and stability control of the industrial power grid under large disturbance is of significant importance for industrial production. In this study, a system for flexible security and stability control (FSSC) is designed with active power emergency control and frequency-voltage coordination function. Fast transfer performance, in terms of industrial comprehensive load model, is analyzed by comparison. A system-level dynamic test platform based on real-time digital simulator (RTDS) is used. The results show that not only the function and operation of the flexible stability controller and fast transfer are verified, but also the industrial system response and transient characteristics are demonstrated stability. The FSSC system ensures the stability of the second defense line for the industrial power grid and provides technical support for engineering applications. © 2021, Beijing Oriental Sun Cult. Comm. CO Ltd.

关键词： Electric power system control

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A Low-Cost Resonant Circuit Breaker Employing Variable Oscillation Frequency with Low di/dt Interruption in Mechanical Switch 4

A Low-Cost Resonant Circuit Breaker Employing Variable Oscil...

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4th International Symposium on electrical, Electronics and Information Engineering, ISEEIE 2024

作者： Zhang, Bei Li, Pengzhi Zhou, Qihao Zhang, Xiangyu Qi, Lei North China Electric Power University State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources Beijing China State Grid Smart Grid Research Institute Co. Ltd. Beijing China State Grid Inner Mongolia Eastern Power Co. Ltd. Neimenggu China

ISBN: (纸本)9798350355772

DC circuit breakers (DCCBs) play a critical role in maintaining the security and stability of DC systems. In recent times, resonant DC circuit breakers (RCBs) have attracted substantial interest, primarily due to their capability to produce several zero-crossing points for mechanical switches (MSs), which in turn, amplifies their dependability. For RCBs, higher oscillation frequencies allow for lower capacitance and inductance values, reducing overall cost and size. However, with increasing interruption capacity, the di/dt faced by mechanical switches during arc extinction at high oscillation frequencies becomes substantial, making arc extinction challenging. To address the aforementioned issues, this paper proposes a low-cost resonant circuit breaker that employs variable oscillation frequency and achieves low di/dt interruption in mechanical switch (VOF-RCB). Initially, a high oscillation frequency is selected for rapid oscillation to the fault current value. Subsequently, an inductance is introduced to lower the oscillation frequency to a range within which the MS can successfully extinguish the arc. This method significantly enhances oscillation efficiency through rapid initial oscillation, enabling the selection of lower capacitance values. Hence, this leads to a significant reduction in the cost and size of capacitors, as well as the total cost and volume. Initially, the topology structure and operational principle of the VOF-RCB are delineated, succeeded by a comprehensive parameter optimization design methodology. An 80 kV/25 kA simulation model is developed to validate the interruption performance of the proposed topology and the precision of the parameter design criteria. © 2024 IEEE.

关键词： Capacitance

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Research on control strategy and dynamic test of multi-port electric energy router 3

Research on control strategy and dynamic test of multi-port ...

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2021 3rd International Conference on Electronic Engineering and Informatics, EEI 2021

作者： Yang, Zaixin Jian, Xusheng Ya, Sitai Inner Mongolia Enterprise Key Laboratory of Smart Grid Simulation of Electrical Power System Inner Mongolia Power Research Institute Hohhot010020 China

Researching an electric energy router and analyzing the control and operation characteristics are of significant importance for bi-high power system. In this study, a multi-modal two-level coordinated control strategy of multi-port electric energy router is proposed to achieve fast and flexible regulation of power flow. a prototype of multi-port energy router is trial-produced with an energy storage system, a sending-end power grid and a receiving-end power grid. Furthermore, a comprehensive dynamic test for the prototype of multi-port energy router is completed. The results show that the dynamic performance of the multi-port energy router in power step test is found to conform to the test standard. The charging and discharging modes of the energy storage unit under multi-modal control strategy are switched correctly. During the energy exchange process, multi-port AC/DC voltage operates stably. It can be applied to multi-port, multi-cascade, multi-flow distribution network. © Published under licence by IOP Publishing Ltd.

关键词： Energy storage

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