scholarly journals Dynamic Phasor Modelling of LCC-HVDC System Based on a Practical Project

2021 ◽  
Vol 256 ◽  
pp. 01034
Author(s):  
Huan Li ◽  
Kang Qin
Keyword(s):  
Block Modeling ◽  
Electromagnetic Transient ◽  
Hvdc System ◽  
Modeling Process ◽  
Practical Project ◽  
Dc Line ◽  
Simulation Results ◽  
Dynamic Phasor

This paper presents a detailed dynamic phasor modeling process of a line-commutated converter-based HVDC (LCC-HVDC) system. Firstly, the dynamic phasor models of the single-ended LCC rectifier station, inverter station and the DC line are established, respectively. Secondly, LCC-HVDC is an AC-DC-AC system. The interfaces are explained to connect the converter stations with the DC line. Through block modeling, it is helpful to simplify the process and verify the accuracy of each block. Finally, based on a practical project, the model is compared with the electromagnetic-transient (EMT) simulation results in PSCAD/EMTDC to verify the accuracy of the dynamic phasor model.

Study of HVDC System and Subsynchronous Oscillation

2015 ◽  
Vol 1092-1093 ◽  
pp. 356-361
Author(s):  
Peng Fei Zhang ◽  
Lian Guang Liu
Keyword(s):  
Power Plant ◽  
Time Domain ◽  
Simulation Method ◽  
Time Domain Simulation ◽  
Stable Convergence ◽  
Turbine Generator ◽  
Plant Model ◽  
Subsynchronous Oscillation ◽  
Hvdc System ◽  
Simulation Results

With the application and development of Power Electronics, HVDC is applied more widely China. However, HVDC system has the possibilities to cause subsynchronous torsional vibration interaction with turbine generator shaft mechanical system. This paper simply introduces the mechanism, analytical methods and suppression measures of subsynchronous oscillation. Then it establishes a power plant model in islanding model using PSCAD, and analyzes the effects of the number and output of generators to SSO, and verifies the effect of SEDC and SSDC using time-domain simulation method. Simulation results show that the more number and output of generators is detrimental to the stable convergence of subsynchronous oscillation, and SEDC、SSDC can restrain unstable SSO, avoid divergence of SSO, ensure the generators and system operate safely and stably

Research on SSO Caused by HVDC Based on Eigenvalue Analysis

2011 ◽  
Vol 383-390 ◽  
pp. 4792-4798
Author(s):  
Dan Zhang ◽  
Xiang Ning Xiao ◽  
Lin Yang ◽  
Ben Feng Gao
Keyword(s):  
Eigenvalue Analysis ◽  
Small Signal ◽  
Analysis Method ◽  
Subsynchronous Oscillation ◽  
Electromagnetic Transient ◽  
Hvdc System ◽  
Electromagnetic Transient Simulation ◽  
Linearized Model ◽  
Oscillation Characteristics ◽  
Oscillation Characteristic

Subsynchronous Oscillation problems caused by HVDC system are studied and analyzed intensively in this paper based on eigenvalue analysis method. By establishing the small signal linearized model of a typical HVDC system, subsynchronous oscillation characteristics of the system with or without SSDC are obtained. Further more, the influence of SSDC parameters to the system subsynchronous oscillation characteristic can be illustrated clearly. This is significant for SSDC design in order to achieve a satisfied restraining effect. Comparing with more accurate electromagnetic transient simulation results, the consistency of the two methods is verified and it can be demonstrated that eigenvalue analysis method is adequate for studying subsynchronous oscillations.

An adaptive DC line fault recovery strategy for LCC-HVDC system based on voltage gradient

2022 ◽  
Vol 135 ◽  
pp. 107558
Author(s):  
Jing Ma ◽  
Ruifeng Wang ◽  
Chen Liu ◽  
Jiaming Zhang ◽  
A.G. Phadke
Keyword(s):  
Voltage Gradient ◽  
Fault Recovery ◽  
Recovery Strategy ◽  
Hvdc System ◽  
Dc Line

A Wavelet Based Directional Algorithm for UHVDC Line Protection

2015 ◽  
Vol 713-715 ◽  
pp. 950-953
Author(s):  
Ya Jie Li ◽  
Jian Cheng Tan ◽  
Shu Xian Zhang
Keyword(s):  
High Frequency ◽  
High Voltage Direct Current ◽  
Protection Scheme ◽  
High Impedance ◽  
Internal Fault ◽  
Current Transmission ◽  
Dc Line ◽  
Simulation Results ◽  
High Impedance Faults ◽  
Transmission Line Protection

When fault distance is greater than a certain value, attenuation of high frequency fault signal over the line is greater than what the DC line boundary is subject to. To sensitively detect a fault and improve the reliability of UHVDC (Ultra High Voltage Direct Current) transmission line protection, a new protection scheme based on wavelet based direction element is proposed, where directional element and attenuation of high frequency energy are used to identify an internal fault. Extensive simulation results show that the proposed protection scheme is able to sensitively detect high impedance faults, identify the faulty pole.

The analysis on a successive forced outage in Chu-Sui HVDC system caused by DC line fault

PES T&D 2012 ◽  
2012 ◽  
Author(s):  
Taoxi Zhu ◽  
Hongyang Zhou ◽  
Jiang Yu ◽  
Jiayi Huang
Keyword(s):  
Hvdc System ◽  
Dc Line

scholarly journals Influence of Inverter Controller Parameters on the Small-signal Stability of LCC-HVDC System Based on a Practical Project

2021 ◽  
Vol 256 ◽  
pp. 01031
Author(s):  
Huan Li ◽  
Kang Qin
Keyword(s):  
Oscillation Mode ◽  
Stability Margin ◽  
Switching Function ◽  
Small Signal ◽  
Small Signal Stability ◽  
Hvdc System ◽  
High Voltage Direct Current ◽  
Eigen Analysis ◽  
Practical Project ◽  
The Impact

Unreasonable control parameters of the Line Commutated Converter based High Voltage Direct Current (LCC-HVDC) system may induce small-signal instability. This paper studies the impact of inverter controller parameters on steady response of the LCC-HVDC system under weak AC grid condition. Firstly, according to a practical project, the small-signal model of LCC-HVDC system is established based on the switching function. Then, the eigen-analysis method is adopted to study the impact of the controller parameters on the inverter side on the oscillation mode and damping characteristics of the LCC system, and the correctness of results is verified by PSCAD/EMTDC simulation. The conclusion shows that reasonable controller parameters can improve the stability margin of the system.

Cosimulation of Shifted-Frequency/Dynamic Phasor and Electromagnetic Transient Models of Hybrid LCC-MMC DC Grids on Integrated CPU–GPUs

2020 ◽  
Vol 67 (8) ◽  
pp. 6517-6530 ◽  
Author(s):  
Dewu Shu ◽  
Yingdong Wei ◽  
Venkata Dinavahi ◽  
Keyou Wang ◽  
Zheng Yan ◽  
...  
Keyword(s):  
Electromagnetic Transient ◽  
Dynamic Phasor ◽  
Transient Models

Hot breaking-down of large-sized pipe stocks

2021 ◽  
Vol 2021 (12) ◽  
pp. 7-11
Author(s):  
Andrey Pasynkov ◽  
Boris Yakovlev
Keyword(s):  
Titanium Alloy ◽  
Large Format ◽  
Modeling Process ◽  
Simulation Results ◽  
The Impact

The generalized results of breaking-down modeling process of large-format pipe stocks made of titanium alloy VT6 are presented. Based on the simulation results of this operation, a static study has been undertaken, according to its results regression dependencies have been obtained, which contribute to assess the impact of a various parameter complex of this technology on the efficacy of the process.

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