Small-signal instability and supplementary coordinated damping-control of LCC-HVDC system with STATCOM under weak AC grid conditions

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.

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Small-signal dynamics and control parameters optimization of hybrid multi-infeed HVDC system

International Journal of Electrical Power & Energy Systems ◽

10.1016/j.ijepes.2017.12.009 ◽

2018 ◽

Vol 98 ◽

pp. 409-418 ◽

Cited By ~ 24

Author(s):

Chunyi Guo ◽

Wei Liu ◽

Chengyong Zhao ◽

Xiaojun Ni

Keyword(s):

Parameters Optimization ◽

Small Signal ◽

Control Parameters ◽

Hvdc System ◽

Dynamics And Control ◽

And Control

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Minimum Short Circuit Ratio Requirement for MMC-HVDC Systems Based on Small-Signal Stability Analysis

Energies ◽

10.3390/en12173283 ◽

2019 ◽

Vol 12 (17) ◽

pp. 3283 ◽

Cited By ~ 1

Author(s):

Zheren Zhang ◽

Liang Xiao ◽

Guoteng Wang ◽

Jian Yang ◽

Zheng Xu

Keyword(s):

Reactive Power ◽

Short Circuit ◽

Small Signal ◽

Small Signal Stability ◽

Ratio Requirement ◽

Planning Stage ◽

Hvdc System ◽

Hvdc Transmission ◽

High Voltage Direct Current ◽

Signal Stability

This paper determines the minimum short circuit ratio (SCR) requirement for a modular multilevel converter based high-voltage direct current (MMC-HVDC) transmission systems. Firstly, a simplified model of MMC is introduced; the MMC is represented by its AC and DC side equivalent circuit. Next, by linearizing the MMC subsystem and the DC network subsystem, the deduction of the small-signal models of MMC subsystem, the small-signal model of the DC network and MMC-HVDC are carried out successively. Thirdly, the procedure for determining the minimum SCR requirement of MMC-HVDC is described. Finally, case studies are performed on a two-terminal MMC-HVDC system under four typical control schemes. The results show that the restraint factors for the rectifier MMC is predominantly the voltage safety limit constraint, and the restraint factors for the inverter MMC are mainly the phase locked loop (PLL) or the outer reactive power controller. It is suggested that the minimum SCR requirement for the sending and the receiving systems should be 2.0 and 1.5 in the planning stage.

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Analysis and Damping Control of Small-Signal Oscillations for VSC Connected to Weak AC Grid During LVRT

IEEE Transactions on Energy Conversion ◽

10.1109/tec.2019.2915680 ◽

2019 ◽

Vol 34 (3) ◽

pp. 1667-1676 ◽

Cited By ~ 4

Author(s):

Xuewei Wang ◽

Jun Yao ◽

Jinxin Pei ◽

Peng Sun ◽

Hailin Zhang ◽

...

Keyword(s):

Small Signal ◽

Damping Control

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A modal analysis of a two area system integrated with wind power through a VSC-HVDC system for small-signal stability improvement

2020 IEEE PES/IAS PowerAfrica ◽

10.1109/powerafrica49420.2020.9219828 ◽

2020 ◽

Author(s):

James Muriuki ◽

Chistopher Muriithi

Keyword(s):

Modal Analysis ◽

Wind Power ◽

Small Signal ◽

Small Signal Stability ◽

Hvdc System ◽

Signal Stability

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

E3S Web of Conferences ◽

10.1051/e3sconf/202125601031 ◽

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.

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