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A grid-forming Control Method of Modular Multilevel Converter with Integrated Distributed Photovoltaic and Battery Energy Storage System

A Grid-forming Control Method of Modular Multilevel Converte...

引用

IEEE/IAS Industrial and Commercial Power System Asia (I&CPS Asia)

作者： Hong Lu Xianyong Xiao Guangfu Tang Zhiguang Lin Zhiyuan He Chong Gao School of Electrical Engineering Sichuan University Chengdu China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China

With the construction of large-scale photovoltaic (PV) stations, the capacity and voltage level of photovoltaic converters need to be improved. This paper presents a novel configuration of grid-connected PV system based on modular multilevel converter, which is capable of integrating multiple PV submodules (PVSM) and battery submodules (BSM). The dc side of PVSM and BSM is coupled, and all PVSMs operate at the maximum power point. A grid forming control is proposed for the converter, which can suppress the PV power fluctuation and provide frequency support for the grid using the energy in the BSMs. The circulating current suppression strategy is adopted to realize the energy balance of the converter and ensure the power quality of output voltage and current. The effectiveness and accuracy of the proposed control method are verified by the simulation results in PSCAD/EMTdc.

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Analysis and Modeling of Electrothermal Characteristics of SiC Power Module Based on Planar Interconnection

Analysis and Modeling of Electrothermal Characteristics of S...

引用

International Conference on (ICEPT) Electronic Packaging technology

作者： Liang Wang Yu Liang Mingzhi Zhao Tongyu Zhang Yuchen Wang J Jin Zhang State Key Laboratory of Advanced Power Transmission Technology(State Grid Smart Grid Research Institute Co.Ltd.) Beijing China School of Electrical Engineering Xi'an Jiaotong University Xi'an China

The research in this paper is based on a silicon carbide power module based on the planar interconnect structure. Combined with the structure of the original design module, this paper make an experimental samples for experimental testing. In this paper, the switching performance of the module is tested by double pulse test, and then the junction temperature of the device is measured by power experiment under certain working conditions. On the basis of experiments, the electrical and thermal characteristics of silicon carbide half-bridge power module based on planar interconnection structure are modeled, and the electrical network model and the transient thermal network model are established. Finally, the electro-thermal coupling mechanism of the planar interconnection power module was analyzed in this paper. Then, based on the modeling of the electrical and thermal characteristics of the module, the electro-thermal coupling simulation was completed by using MATLAB, and the simulation results were compared with the power experiment results under the same working conditions to verify the accuracy of the electro-thermal coupling model.

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Design and Application of Trigger Switch Scheme for dc Controllable Lightning Arrester

Design and Application of Trigger Switch Scheme for DC Contr...

引用

IEEE International Conference on Power and Power and Renewable Energy (ICPRE)

作者： Jiang Zhe Li Zhibing Liu Shan Deng Weihua Zhang Ran Han Naizheng State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Beijing China China Electric Power Research Institute Co. Ltd Beijing China

During the AC side fault crossing process of the Baihetan to Jiangsu ± 800 kV hybrid dc transmission project, controllable lightning arresters need to be installed to limit the absorption of redundant energy by overvoltage on the flexible busbar. In order to achieve 1 ms rapid input of controllable lightning arresters, it is necessary to develop a high-voltage dc trigger switch. According to the engineering requirements, a topology structure of trigger switch using trigger gap parallel fast mechanical switch was designed, and a fast trigger strategy is developed to clarify the design scheme and key technical parameters of trigger gap and fast mechanical switch. After verification of the trigger switch debugging waveform in the application of the Baijiang Project, the response speed and key technical indicators of the trigger switch fully meet the requirements of the Baijiang Project.

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Evaluation of Electromagnetic Shielding Performance for the Monitoring Unit Shield of an Ultra-High Voltage Converter Valve

Evaluation of Electromagnetic Shielding Performance for the ...

引用

HVdc (HVdc), International Conference on

作者： Guangxin Jiang Jin Liu Jianan Zhang Lin Zheng Qiang Zhao Tianshu Sun State Grid Inner Mongolia East Electric Power Co. Ltd. Hohhot China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China State Grid Inner Mongolia East Electric Power Co. Ltd. Inner Mongolia EHV And UHV Branch Tongliao China

ISBN: (数字)9798350387759

ISBN: (纸本)9798350387766

UHVdc transmission technology is an important means for the power grid to achieve large-scale power transmission. The performance of its core equipment, the converter valve, is closely related to the operational reliability of the dc transmission project. In order to achieve reliable triggering, protection, and monitoring functions for the converter valve, the circuit board of the online monitoring unit in the valve tower plays a key role. However, due to the circuit board being directly installed near the thyristors inside the converter valve module, it often operates in a harsh environment with high potential, strong electromagnetic fields, and intense heat. If the electromagnetic compatibility performance of the monitoring unit does not meet the requirements, it may lead to issues such as reduced measurement accuracy, high communication error rates, and communication errors. Therefore, this study focuses on the research of electromagnetic protection for the monitoring unit circuit board. First, based on the ± 800kV converter valve structure, a full-circuit simulation model of the converter valve was established. Then, the calculation method of the electromagnetic field during the operation of the converter valve was analyzed. Combining the frequency-domain finite integration method and circuit time-domain calculation, the level of disturbance caused by the switch-off voltage and turn-on current on the PCB board of the TTM were evaluated. Additionally, the shielding performance of the shield cover on the PCB for far-field and near-field disturbances was assessed. The study concludes that the shield cover can effectively protect against the near-field disturbances generated by the valve module, providing theoretical support for the electromagnetic protection design of the online monitoring unit of the converter valve.

关键词： HVdc transmission Frequency-domain analysis Printed circuits Poles and towers Valves Electromagnetic fields Protection Integrated circuit reliability Time-domain analysis Monitoring

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Design of a Configurable dc/dc Converter for High Voltage High Power IGBT Driver

Design of a Configurable DC/DC Converter for High Voltage Hi...

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Electrical Engineering and Control Science (IC2ECS), International Conference on

作者： Jinkun Ke Zhaoliang Guan Jiancheng Bai Yuan Chen Ping Chen State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China Nanjing Linkwah Technologies Inc. Nanjing China

In response to the characteristics of high voltage and high power IGBT drive applications, a configurable dc/dc converter is designed using 0.18 µm BCD technology. The paper analyzes the operational principles of the circuit and elaborates on the functions and topology design of each sub module. The circuit employs a unique two-stage voltage regulation structure, eliminating output voltage fluctuations caused by pulse output characteristics. Test results indicate that parameters such as circuit startup time, shutdown time, and output voltage accuracy meet the design requirements.

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Maximum Turn-Off Current of SiC MOSFET-Based Solid state Circuit Breaker

Maximum Turn-Off Current of SiC MOSFET-Based Solid State Cir...

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Electrical, Electronics and Information Engineering (ISEEIE), International Symposium on

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

ISBN: (数字)9798350355772

ISBN: (纸本)9798350355789

Nowadays, solid-state circuit breakers(SSCB) are widely adopted in direct current (dc) microgrid because of their advantages such as interruption without arc and faster turn-off speed. The SSCB primarily operates at high temperature. Traditional Si based devices cannot meet requirements for high-temperature operation. Due to their advantages of low conduction losses and high-temperature resistance, SiC MOSFETs present extensive prospects for high-temperature applications within SSCBs. In SSCBs, one of the key properties of power semiconductors is their ability to turn off pulsed overcurrent. Therefore, it is necessary to research on the maximum turn-off capability of SiC MOSFETs under various temperature conditions. The simulation of SiC MOSFET single pulse circuit in L Tspice is used to understand the turn-off current waveform of SiC MOSFET. Based on the study of single failure waveforms and Foster thermal network model, the desaturation voltage of SiC MOSFET is taken as the basis of maximum turn-off current. The final experimental results show that the maximum turn-off current of SiC MOSFET can reach 4–5 times of the rated current under various temperature conditions. This research provides crucial insights for the better application and optimization of SiC MOSFET in SSCBs.

关键词： Temperature measurement Semiconductor device modeling MOSFET Voltage measurement Temperature Silicon carbide Logic gates Solid state circuits Integrated circuit modeling Optimization

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Stability Improvement Strategy of Distribution Network Based on grid-Forming Mode Switching

Stability Improvement Strategy of Distribution Network Based...

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IEEE Asia Power and Energy Engineering Conference (APEEC)

作者： Xiaobin Mu Guofu Chen Tailin Huang Xiang Wang Xiaoyu Zhang Fei Rong State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Beijing China College of Electric and Information Engineering Hunan University Changsha China

Distributed photovoltaic is generally connected to the distribution network through grid-following inverter, which may cause a series of stability problems when the connection ratio is high. The dual-mode inverter with grid-following and grid-forming can ensure the stable access to the grid of distributed photovoltaic by mode switching. Nowadays, the research mainly focuses on the switching strategy of grid-following/islanding, and there is little research on how to choose the optimal switching scheme when the distributed photovoltaic is connected to multiple points. In this regard, this paper focuses on the distribution system with dual-mode inverter access, and proposes a mode switching strategy that integrates the stability margin and voltage deviation requirements of the system to improve the power quality and stable operation when the system parameters change. The simulation results verify the effectiveness of the proposed mode switching strategy.

关键词： Photovoltaic systems simulation Power quality Switches Distribution networks Voltage Power system stability

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A Generic grid-forming Control Structure for Modular Multilevel Converters

A Generic Grid-forming Control Structure for Modular Multile...

引用

Power Electronics and Power System Conference (PEPSC)

作者： Renxin Yang Gang Shi Qi Liu Xu Cai State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Beijing China Key Laboratory of Control of Power Transmission and Conversion Shanghai Jiao Tong University Shanghai China

The grid-forming control is recognized as an effective method to cope with the power grid stability problems with high renewable power penetration. The application of grid-forming control in modular multilevel converter-based high-voltage direct-current (MMC-HVdc) transmission systems is a promising trend. However, the MMC usually needs to switch between different control modes, such as dc voltage control, active power control, AC voltage control, etc. Conventional grid-forming control structures are hard to meet the above requirements. To solve this problem, a generic grid-forming control structure is proposed in this paper. The stored energy in the submodule capacitors of the MMC is utilized to construct the grid-synchronization mechanism. On this basis, a multi-variable control structure is applied on the dc side, making it easy to switch between different operation modes. Finally, simulation results in PSCAD/EMTdc show the effectiveness of the proposed control structure.

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Evaluation of Phase-Locked Loop Stability Considering Electromagnetic Transient Process

Evaluation of Phase-Locked Loop Stability Considering Electr...

引用

smart Power & Internet Energy Systems (SPIES), International Conference on

作者： Xiaoge Liu Chaobo Dai Zhichang Yang Zhanfeng Deng Guoliang Zhao State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Beijing China

grid-following converters may experience loss of synchronization, especially when power system becomes weak or grid fault occurs. So far, it has been found that this phenomenon is associated with Phase-Locked Loop (PLL) dynamics and several methods to analyze such issues have been proposed. However, it seems that the impact of electromagnetic transient process caused by converter current variation or grid voltage drop is not well investigated in these methods. In this article, a systematic method considering such electromagnetic transients for PLL stability assessment is presented. According to the proposed approach, the PLL performance involving the electromagnetic transient process is derived by using differential equations in time domain. Moreover, based on the nonlinear system theory, a scheme for PLL stability evaluation is designed. The effect of the electromagnetic transients on the stability of PLL system is also discussed. The accuracy of the proposed method is validated through simulation.

关键词： Systematics Power system dynamics Voltage Power system stability Stability analysis Synchronization Phase locked loops

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Logistic-Chebyshev Cascaded Chaotic Space Vector Pulse Width Modulation for Common-Mode EMI Suppression in Motor Drive System

Logistic-Chebyshev Cascaded Chaotic Space Vector Pulse Width...

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China Power Supply Society Electromagnetic Compatibility Conference (CPEMC)

作者： Hong Li Yanjun Li Zuoxing Wang Minglei Zhou Bo Zhang Zhichang Yang School of Electrical Engineering Beijing Jiaotong University Beijing China School of Electric Power Engineering Beijing Jiaotong University Beijing China School of Electric Power Engineering South China University of Technology Guangzhou China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institutey Beijing China

ISBN: (数字)9798331509552

ISBN: (纸本)9798331509569

Space vector pulse width modulation (SVPWM) is widely used in motor drive systems, and chaotic SVPWM can effectively suppress common-mode voltage spikes at the switching frequency and its multiples on the EMI spectrum by varying the switching frequency randomly within a certain range. However, the current discrete chaotic mappings commonly used to realize chaotic SVPWM suffer from uneven probability density distribution and poor randomness under limited computational precision, reducing the EMI suppression effect. This paper analyzes the generation mechanism of common-mode EMI in motor drive systems and identifies shortcomings in traditional chaotic SVPWM. Then proposes a Logistic-Chebyshev cascaded chaotic SVPWM to enhance randomness and improve the probability density distribution of mappings, aiming to improve the effectiveness of chaotic SVPWM in suppressing common-mode EMI spikes in motor drive systems. The proposed method's effectiveness is validated through MATLAB/Simulink simulations. This method provides a new approach for suppressing common-mode EMI suppression in motor drive systems.

关键词： Space vector pulse width modulation Motor drives Chaotic mapping Power supplies Switching frequency simulation Electromagnetic interference Voltage Vectors MATLAB

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