首页|Harmonic State Space Based Impedance Modeling and Virtual Impedance Based Stability Enhancement Control for LCC-HVDC Systems

Harmonic State Space Based Impedance Modeling and Virtual Impedance Based Stability Enhancement Control for LCC-HVDC Systems

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Line commutated converter based high-voltage di-rect-current(LCC-HVDC)transmissions are prone to harmonic oscillation under weak grids.Impedance modeling is an effec-tive method for assessing interaction stability.Firstly,this paper proposes an improved calculation method for the DC voltage and AC currents of commutation stations to address the com-plex linearization of the commutation process and constructs an overall harmonic state-space(HSS)model of an LCC-HVDC.Based on the HSS model,the closed-loop AC impedances on the LCC-HVDC sending and receiving ends are then derived and verified.The impedance characteristics of the LCC-HVDC are then analyzed to provide a physical explanation for the harmon-ic oscillation of the system.The effects of the grid strength and control parameters on system stability are also analyzed.To im-prove the impedance characteristics and operating stability of the LCC-HVDC system,a virtual impedance based stability en-hancement control is proposed,and a parameter design method is considered to ensure satisfactory phase margins at both the sending and receiving ends.Finally,simulation results are pre-sented to verify the validity of the impedance model and virtual impedance based stability enhancement control.

Line commutated converter based high-voltage direct-current(LCC-HVDC)transmissionharmonic state spacestability analysisharmonic oscillationvirtual impedance

Yifeng Liu、Xiaoping Zhou、Quan Chen、Hanhang Yin、Lerong Hong、Hao Tian、Ying Chen、Siyuan Li

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College of Electrical and Information Engineering,Hunan University,Changsha 410082,China

Zhejiang Magtron Intelligent Technology Limited Cooper-ation,Jiaxing 314000,China

State Grid Qianjiang Electric Power Company,Qianjiang 433100,China

National Natural Science Foundation of ChinaMajor Special Project of Hunan ProvinceInnovation Young Talents Program of Changsha Science and Technology Bureau

U21666022020GK1010kq2107005

2024

10.35833/MPCE.2022.000722

现代电力系统与清洁能源学报(英文版)

现代电力系统与清洁能源学报(英文版)

ISSN：
年,卷(期)：2024.12(1)
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