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transient voltage Support Strategy of Grid-forming Medium voltage Photovoltaic Converter in the LCC-HVDC System

CSEE Journal of Power and Energy Systems 2024年第5期10卷 1849-1864页

作者： Hong Lu Xianyong Xiao Guangfu Tang Zhiyuan He Zhiguang Lin Chong Gao Zixuan Zheng College of Electrical Engineering Sichuan UniversityChengdu 610065China State Key Lab of Advance Power Transmission Technology China Electric Power Research InstituteBeijing 100192China College of Electrical Engineering Sichuan UniversityChengdu 610065China.

The participation of photovoltaic(PV)plants in supporting the transient voltage caused by commutation failure in the line-commutated-converter-based high voltage direct current(LCC-HVDC)system is of great significance,as it can enhance the DC transmission ***,it is found that the gridfollowing(GFL)PV converters face the problem of mismatch between reactive power response and transient voltage characteristic when the voltage converts from low voltage to overvoltage,further aggravating the overvoltage ***,this article proposes a transient voltage support strategy based on the gridforming(GFM)medium voltage PV *** proposed strategy takes the advantage of the close equivalent electrical distance between the converter and grid,which can autonomously control the converter terminal voltage through GFM control with adaptive voltage droop *** simulation results show that the proposed strategy can ensure the output reactive power of the PV converter quickly matches the transient voltage characteristic at different stages,indicating that the proposed strategy can effectively support the transient voltage.

关键词： Commutation failure grid-forming(GFM) photovoltaic(PV)converter reactive power response transient voltage

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Detailed Analysis of the transient voltage in a JT-60SA PF Coil Circuit

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Plasma Science and Technology 2013年第2期15卷 148-151页

作者： K. YAMAUCHI K. SHIMADA T. TERAKADO M. MATSUKAWA R. COLETTI A. LAMPASI E. GAIO A. COLETTI L. NOVELLO Japan Atomic Energy Agency 801-1 Mukoyama Naka Ibaraki 311-0193 Japan ENEA 1-00044 Frascati Rome Italy Consorzio RFX Euratom-ENEA Association C.so Stati Uniti 4Padova Veneto 35127Italy Fusion for Energy Boltzmannstr 2Garching Bavaria 85748 Germany

A superconducting coil system is actually complicated by the distributed parameters, e.g. the distributed mutual inductance among turns and the distributed capacitance between adjacent conductors. In this paper, such a complicated system was modeled with a reasonably simplified circuit network with lumped parameters. Then, a detailed circuit analysis was conducted to evaluate the possible voltage transient in the coil circuit. As a result, an appropriate （minimum） snubber capacitance for the Switching Network Unit, which is a fast high voltage generation circuit in JT-60SA, was obtained.

关键词： JT-60SA power supply transient voltage snubber PSIM

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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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Effect of Switching Devices on Power Quality and transient voltage Suppression Using Capacitor Bank Model

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Journal of Power and Energy Engineering 2022年第5期10卷 77-89页

作者： Isaac Kofi Mensah Prah Joseph Cudjoe Attachie Electrical and Electronic Engineering Department University of Mines and Technology Tarkwa Ghana

The main purpose of the electrical power system is to transport and distribute energy generated by the central power plants in a safe and reliable manner to the customer premises. Most of the electrical equipment is exposed within the open which suggests they can be vulnerable to lightning strikes, road dwindling, windstorms, and a few engineering activities with the potential of causing different degrees of damage to the electrical equipment. One of the ways to guard the equipment is to deploy switching devices. However, the operations of most of these switching devices produce oscillatory transient in the electrical transmission and distribution systems which result in voltage, current, and frequency fluctuations in the load. This paper investigates the effect of switching devices on power quality and proposes a positive sequence voltage power transient suppression technique that can spontaneously improve the distorted voltage at the instant of capacitor switching using the capacitor line model as a case study. MATLAB/Simulink software was utilized for the analysis on an electrical network model with bus voltages of 69 kV/12.47 kV and 480 V. The results showed that, during switching operations, the positive sequence voltage power detector block produces ripple-free accurate results.

关键词： Capacitor Banks Inrush Current Laplace Transform Power Quality Posi-tive Sequence Switching transient voltage

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