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Design Aspects of hybrid hvdc System

CSEE Journal of Power and Energy Systems 2021年第3期7卷 644-653页

作者： Hong Rao Yuebin Zhou Changyue Zou Shukai Xu Yan Li Liu Yang Weihuang Huang Electric Power Research Institute of China Southern Power Grid Guangzhou 510663China

hybrid high voltage direct current transmission(hybrid hvdc)is a new type of hvdc technology developed in recent *** combines the characteristics of large-capacity and low cost of the line commutated converters(LCC)and non-commutation failure and dynamic reactive power support of the voltage sourced converters(VSCs)in one hvdc *** has technical advantages in the fields of unidirectional power transmission and in the application of improving the stability of multi-infeed hvdcs,giving it broad application *** paper defines the basic form of hybrid hvdc first and discusses the characteristics and challenges of different hybrid ***,it analyzes the matching characteristics between LCC and VSC in the station-station hybrid hvdc,studies the key technologies,such as VSC topologies and control strategies for clearing the DC overhead line faults,and introduces the key technologies for analyzing and suppressing the high-frequency resonances between VSC and the power *** this paper,using the Wudongde UHV multi-terminal hvdc as an example,the proposed key technologies are analyzed and verified.

关键词： DC overhead lines high frequency resonance hybrid hvdc LCC VSC

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Single-ended protection method for hybrid hvdc transmission line based on transient voltage characteristic frequency band

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Protection and Control of Modern Power Systems 2023年第2期8卷 207-217页

作者： Hongchun Shu Shixin Wang Shunguang Lei Yunnan Key Laboratory of Green Energy Electric Power Measurement DigitalizationControl and ProtectionKunming University of Science and TechnologyKunming 650500Yunnan ProvinceChina School of Electrical Engineering and Automation Harbin Institute of TechnologyHarbin 150001Heilongjiang ProvinceChina

hybrid high-voltage direct current(hvdc)transmission has the characteristic of long transmission distance,complex corridor environment,and rapid fault evolution of direct current(DC)*** high fault current can easily cause irreversible damage to power devices,rapid and reliable line protection and isolation are necessary to improve the security and reliability of hybrid hvdc transmission *** address such requirement,this paper proposes a single-ended protection method based on transient voltage frequency band ***,the frequency characteristics of the smoothing reactor,DC filter,and DC line are analyzed,and the characteristic frequency band is defined.A fault criterion is then constructed based on the voltage characteristic frequency band energy,and faulty pole selection is performed according to the fault voltage characteristic frequency band energy *** proposed protection method is verified by simulation,and the results show that it can rapidly and reliably identify internal and external faults,accurately select faulty poles without data communication synchronization,and has good fault-resist-ance and anti-interference performance.

关键词： Boundary frequency characteristics Characteristic frequency band hybrid hvdc Single-end protection Transient voltage

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The On-site Verification of Key Technologies for Kunbei-Liuzhou-Longmen hybrid Multi-terminal Ultra hvdc Project

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CSEE Journal of Power and Energy Systems 2022年第5期8卷 1281-1289页

作者： Hong Rao Changyue Zou Shukai Xu Xipeng Cai Yan Li Xiaobin Zhao Yuebin Zhou Yu Yang Wei Wei Jun Chen Tianliu Wei Research Institute China Southern Power GridHuangpu DistrictGuangzhou 510080China China Southern Power Grid Huangpu DistrictGuangzhou 510080China

hybrid high voltage direct current transmission(hybrid hvdc)is a new type of hvdc technology developed in recent *** combines the characteristics of large-capacity and low cost of the line commutated converters(LCC)and non-commutation failure and dynamic reactive power support of voltage sourced converters(VSCs)in one hvdc *** has technical advantages in the fields of unidirectional power transmission and in the application of improving the stability of multi-infeed hvdcs,giving it broad application *** Kunbei-Liuzhou-Longmen(KBL)project is the first hybrid ultra hvdc *** was put into service on Dec.27th,*** paper introduces the KBL project,analyzes the operation characteristics of hybrid hvdc system,and provides on-site verification of KBL project,including operation of LCC-VSC hybrid system,ultra-high voltage VSC technology using the series of two valve groups,the DC fault ride-though of hybrid VSC without using DC breaker,the connection and disconnection of a third station,and etc.

关键词： DC overhead lines hybrid hvdc LCC-hvdc VSC-hvdc VSC topology on-site commissioning

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