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检索条件"机构=Beijing Key Laboratory of DC Grid Technology & Simulation State Grid Smart Grid"

共 331 条记录，以下是31-40 订阅

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Fault Isolation Strategy Based on Diode Groups of All-dc Offshore Wind Power Transmission System 7

Fault Isolation Strategy Based on Diode Groups of All-DC Off...

引用

7th IEEE Conference on Energy Internet and Energy System Integration, EI2 2023

作者： Yuan, Yijia Cheng, Tingting Lin, Zhiguang Su, Pengfei Li, Yuanzhen State Grid Smart Grid Research Institute Co .Ltd State Key Laboratory of Advanced Power Transmission Technology Beijing China

ISBN: (纸本)9798350345094

The All-dc collection and transmission technology for offshore wind power has currently become a research hotspot, due to no need of power frequency transformers with large capacity, avoiding charging power problems of AC cable capacitors and the ability to improve the stability of offshore wind turbines generator (WTG) and converter stations, etc. The equipment of the All-dc wind power transmission system has a large number of power electronic devices and exhibits low-inertia characteristics, thus the rapid development of dc faults will threaten the stable operation of the system. This paper proposes an All-dc wind power transmission topology and fault isolation strategy based on diode groups. The system fault characteristics of dc cable faults on the WTG branch are analyzed. Combined with the unidirectional conductivity of diodes, a topology of connecting diodes on the branch of the series-connected WTGs is proposed, which provides conditions to decouple the faulted and healthy areas structurally. A fault isolation strategy is proposed and verified through simulation analysis. A preliminary study on the engineering application shows obvious economic advantages, thus providing a research basis for the large-scale offshore All-dc wind power transmission scenarios. © 2023 IEEE.

关键词： Diodes

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Characteristic Harmonics Suppression Strategy for LCC-MMC Based HVdc System 20

Characteristic Harmonics Suppression Strategy for LCC-MMC Ba...

引用

20th International Conference on AC and dc Power Transmission 2024, ACdc 2024

作者： Shi, Yang Liu, Dong Li, Yunfeng Zhang, Jialin State Grid Corporation of China Beijing China National Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China National Key Laboratory of Power Grid Disaster Prevention and Reduction Changsha University of Science and Technology School of Electrical & Information Engineering Changsha China

ISBN: (纸本)9781837242672

This paper proposes a characteristic harmonics suppression strategy for the LCC-MMC based HVdc system using the MMC. Firstly, the topology of the LCC-MMC based HVdc system is introduced, in which the sending end converter station adopts the LCC-MMC hybrid converter valves despite of the structure of receiving end converter. Secondly, in the outer voltage loop of the MMC, high pass filters, band pass filters, and notch filters are used to extract the characteristic harmonics of the LCC converter for performance comparison, and they are reverse superimposed onto the reference current. In the inner current loop, a PIR control strategy is proposed to track and compensate for the characteristic harmonics without influence on the fundamental components. Finally, the LCC-MMC based HVdc system is constructed in MATLAB/Simulink to verify the effectiveness of the proposed characteristic harmonics suppression strategy. © The Institution of Engineering & technology 2024.

关键词： Notch filters

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A Transient Voltage Support Strategy Based on Medium Voltage Photovoltaic grid-Connected Converter during Commutation Failure in the LCC-HVdc System 8

A Transient Voltage Support Strategy Based on Medium Voltage...

引用

8th International Conference on Power and Renewable Energy, ICPRE 2023

作者： Lu, Hong Liu, Yali Yuan, Yijia Deng, Weihua Su, Pengfei Jiang, Xirui State Grid Smart Grid Research Institute Co. Ltd. State Key Laboratory of Advanced Power Transmission Technology Sichuan University Chengdu Beijing China State Grid Smart Grid Research Institute Co. Ltd. State Key Laboratory of Advanced Power Transmission Technology Beijing China

ISBN: (纸本)9798350328813

The transient overvoltage caused by commutation failure in the LCC-HVdc system is a key factor limiting the dc transmission capacity. During the commutation failure period, the voltage of the sending AC grid exhibits a characteristic of "first decrease then rise", and the time to transition from low voltage to high voltage is relatively short. The existing photovoltaic (PV) grid-connected converters have the characteristics of long equivalent electrical distance from the grid, small capacity, and weak reactive power support ability, making it difficult to effectively support transient voltage. This article proposes a method of using medium voltage PV grid-connected converters to support the transient voltage caused by commutation failure in the LCC-HVdc system, which actively responds to voltage changes through a grid-forming control strategy and can instantly adjust the reactive power output of the converter. The simulation results show that the proposed method can effectively support the transient voltage and reduce the amplitude of transient overvoltage. © 2023 IEEE.

关键词： commutation failure grid-forming LCC-HVdc photovoltaic grid-connected converter transient voltage support

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A Hybrid Cascaded UHVdc Transmission System at Sending End for High Proportion of Renewable Energy Delivery 7

A Hybrid Cascaded UHVDC Transmission System at Sending End f...

引用

7th IEEE Conference on Energy Internet and Energy System Integration, EI2 2023

作者： Zhou, Jiapei Kou, Longze Li, Fangyuan Gao, Yang Gu, Huaiguang Liu, Dong State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Beijing China

ISBN: (纸本)9798350345094

A scheme of sending end VSC (self-commutation and flexible control)-LCC (low cost, high capacity and strong short-time overload capability) hybrid cascaded UHVdc for delivery of ultra-high-proportion renewable energy had been proposed in this paper. Based on this scheme, the advantages of VSC and LCC can be integrated to realize the multi-time scale dynamic reactive power response and strong virtual inertia response on the sending end as well as the high-frequency wide-range adjustment of active power. The proposed scheme is a possible solution to the issues of static voltage stability, transient over-voltage and low inertia, which are commonly regarded as the main challenges for the delivery of ultra-high-proportion renewable energy with an inevitable weak AC grid. As a result, the capacity requirements of synchronous condenser or STATCOM on sending-end could be reduced significantly with the proposed scheme. The topology and control strategies of this scheme had been explained thoroughly. The superior performance of the proposed scheme has been validated by EMT simulation under various typical operation conditions. © 2023 IEEE.

关键词： Reactive power

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Behavior Modeling and Analysis of High-Voltage SiC MOSFET Considering Temperature Effect 49

Behavior Modeling and Analysis of High-Voltage SiC MOSFET Co...

引用

49th Annual Conference of the IEEE Industrial Electronics Society, IECON 2023

作者： Li, Weiguo Xu, Yunfei Li, Qingping Hao, Yi Zhao, Guoliang Liu, Haijun State Grid Smart Grid Research Institute Co. Ltd State Key Laboratory of Advanced Power Transmission Technology Beijing China State Grid Smart Research Institute Co. Ltd State Key Laboratory of Advanced Power Transmission Technology Beijing China

ISBN: (纸本)9798350331820

Silicon carbide (S iC) MOSFETs have better dynamic characteristics and higher operating temperatures, and are more suitable for high temperature, high-frequency and high-voltage applications due to their fast turn-on and turn-off speeds. Since high-voltage SiC MOSFET devices can effectively reduce circuit system complexity, the application advantages of high-voltage SiC MOSFET devices are highlighted. The lack of fast and accurate simulation models is one of the key problems facing the current development of high-voltage SiC MOSFET device applications. This paper provides a behavior modeling of high-voltage SiC MOSFETs considering the effect of variable temperature. The model further characterizes and fits temperature-sensitive parameters based on the characteristics of the behavior model parameters for the differences in static characteristics of high-voltage SiC MOSFETs under different temperature conditions, and the model optimizes the SiC MOSFET equivalent circuit and considers the internal parasitic parameters of SiC MOSFETs to improve the accuracy of the model fitting. In this paper, the behavior modeling of a 6.5kV/400A SiC MOSFET device developed by state grid smart grid Research Institute Co., Ltd. and verifies the validity and accuracy of the model at different temperatures by comparing the simulation data of the static model at different temperatures with the test results. Furthermore, the accuracy and convergence of the model dynamic characteristics are verified by a double-pulse test circuit and LLC resonance simulation circuit. © 2023 IEEE.

关键词： Silicon carbide

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Modeling and simulation Method of Offshore Power Delivery System with Hydrogen Production 4

Modeling and Simulation Method of Offshore Power Delivery Sy...

引用

4th International Conference on Electrical Engineering and Control Technologies, CEECT 2022

作者： Gu, Huaiguang Zhang, Jian Kou, Longze Zhou, Jiapei State Key Laboratory of Advanced Transmission Technology China Beijing Key Laboratory of Dc Power Grid Technology and Simulation China State Grid Smart Grid Research Institute Co. LTD. Beijing China

ISBN: (纸本)9781665498999

With the depletion of global fossil energy and the worsening of global environmental problems, the development and utilization of renewable clean energy has become an important direction in the world's energy technological change. Hydrogen energy, as a highly clean renewable energy, has become a research hotspot in the world. In this paper, a typical offshore energy system model is proposed. Firstly, according to the thermodynamic phenomena and electrochemical dynamic characteristics of the alkaline electrolyzer, the electromagnetic transient model of hydrogen production unit is established. Then, a grid-connected control scheme based on the direct current of the electrolyzer is proposed to connect the offshore wind farm with the hydrogen production system. Finally, a complete model is built on PSCAD and the electromagnetic transient simulation analysis is carried out. The results show that the system can provide stable and reasonable dc current to hydrogen production system through 60 mw wind farm, which verifies the correctness and effectiveness of the model. © 2022 IEEE.

关键词： Hydrogen production

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Topology and Control Strategy of dc Sending System of Diode Converter with Flywheel Energy Storage for Western Wind Power Generation 6

Topology and Control Strategy of DC Sending System of Diode ...

引用

6th International Conference on Power and Energy technology, ICPET 2024

作者： Yan, Jun Wang, Siyao Wang, Sen Li, Tianxin Pan, Peiyuan State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Beijing China North China Electric Power University Beijing China

ISBN: (纸本)9798350375855

With the strategy of sending electricity from west to east, wind power in the west has ushered in large-scale development. In order to realize long-distance transmission, flexible dc transmission technology is developing rapidly, and the use of diode converter instead of MMC converter can significantly reduce the construction cost. However, the diode converter requires the wind farm AC side to have passive operation capability, this paper adopts flywheel energy storage to provide power support for the diode converter to meet the black start requirements. This paper introduces the topology and operation mode of the diode converter dc sending system with flywheel energy storage, introduces the active and reactive power calculation formula and the three-phase voltage inverter simulation model in the SVPWM control mode in the system operation, and specifically demonstrates the modeling interface of wind speed model, wind power generation system model, charging model of flywheel energy storage system, and discharging model of flywheel energy storage system in the simulation system modeling, and in the last part of the simulation operation section builds a diode converter with flywheel energy storage to provide power support for the wind farm AC side to meet the black start requirements. The simulation operation part builds the wind power generation system with flywheel energy storage, and inputs the simulated wind speed to control the stabilization of grid-connected voltage to verify the feasibility of the proposed dc sending system topology and control principle through simulation analysis. © 2024 IEEE.

关键词： Flywheels

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Research on High Voltage High Capacity Multi-port Energy Router 8

Research on High Voltage High Capacity Multi-port Energy Rou...

引用

8th International Conference on Power and Renewable Energy, ICPRE 2023

作者： Weihua, Deng Lanlan, Ji Yali, Liu Zhe, Jiang Naizheng, Han Zhiguang, Lin State Grid Smart Grid Research Institute Co. Ltd State Key Laboratory of Advanced Power Transmission Technology Beijing China

ISBN: (纸本)9798350328813

Energy routers are key devices that promote the utilization and consumption of new energy resources, as well as achieve energy conversion and routing. This article proposes a new idea of high-voltage and large-capacity energy routers for regional energy management. A 110kV seven-port energy router electrical topology is constructed, consisting of three modular multi-level AC/dc converters, three bidirectional dc/dc transformers, and one dc circuit breaker. A detailed analysis is conducted on four different operating modes and the respective control strategies of the energy router. The VF droop controller is designed, including voltage droop control and frequency droop control. For demonstration engineering applications, an energy router start stop control logic has been designed. Finally, the effectiveness of the control strategy proposed in this paper is verified through the switching test waveforms between the main operation mode and auxiliary operation mode on the demonstration project site. © 2023 IEEE.

关键词： Energy router Engineering application Multi-port New energy resources

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The Research on Cluster dc Voltage Balancing of Star-Connected Cascaded H-bridge STATCOM 14

The Research on Cluster DC Voltage Balancing of Star-Connect...

引用

14th IEEE International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2023

作者： Hu, Kai Zhao, Guoliang Lu, Zhengang Yu, Hongyang Li, Weiguo Dai, Chaobo State Grid Smart Grid Research Institute Co. Ltd State Key Laboratory of Advanced Power Transmission Technology Beijing China

ISBN: (纸本)9798350328233

Star-connected cascaded H-bridge STATCOMs are widely used in power systems due to their modular performance, small output harmonics, and applicability to high voltage. However, the uneven losses of three phases and the unbalanced active power generated by unbalance grid voltages lead to the problem of phase to phase dc voltage unbalance in star-connected cascaded H-bridge STATCOMs. The clustered dc voltage balancing control using zero sequence voltage injection is suitable for star-connected cascaded H-bridge STATCOMs because no zero-sequence current is generated in the three-phase three-wire system. However, the conventional zero-sequence voltage injection method contains many complex operations, such as trigonometric operations, square root and inverse trigonometric operations, etc. These complex operations increase the computational burden of the controller. In order to eliminate the complex operations of the traditional method, this paper proposes an improved phase-to-phase dc voltage equalization control strategy by deriving the active power relationship of the three phases of STATCOM, which has no complex operations such as inverse trigonometric function, and also extracts the unbalanced power directly from the grid voltage as feedforward control, which improves the control effect and dynamic performance of phase-to-phase dc voltage equalization. Finally, the effectiveness of the proposed control method is verified by simulation. © 2023 IEEE.

关键词： Feedforward control

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Optimal Planning of HVdc Converter Stations for AC-dc Mixed Power grid with High Penetration of Renewable Energy 8

Optimal Planning of HVDC Converter Stations for AC-DC Mixed ...

引用

8th International Conference on Power and Renewable Energy, ICPRE 2023

作者： Zhou, Jiapei Kou, Longze Li, Fangyuan Liu, Qi Fan, Zheng Liu, Dong State Grid Smart Grid Research Institute Co. Ltd State Key Laboratory of Advanced Power Transmission Technology Beijing China

ISBN: (纸本)9798350328813

High voltage direct current (HVdc) transmission is the best option to deliver generated power especially from renewable energy, e.g. wind and solar farms that are far away from the load center. However, one of the key challenges in designing the HVdc integrated into the receiving end AC power grid is to optimize the location for HVdc converter stations of different capacities. Optimizing the location of HVdc converter stations has significant impact on the system short circuit capacity, voltage stability and multi-infeed short circuit ratio (MISCR). The optimal sizing and placement problem of HVdc converter stations is formulated as a complex multi-criteria decision making which considers economical efficiency, power system stability, and the power flow distribution of the grid. A case study based on the IEEE 39-bus system with high penetration of renewable energy is performed to evaluate the effectiveness of the proposed method. The ranking of the optimal locations is done by combining grey relational theory and technique for order preference by similarity to ideal solution (TOPSIS). The results demonstrate that the proposed method can locate optimal sites for HVdc stations at different capacities. © 2023 IEEE.

关键词： grey relational theory HVdc converter station optimal location TOPSIS

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