Open AccessResearch on transient stability control method for LCC‐HVDC receiving‐end system based on the gradient of dynamic energy
Author(s) -
Ma Jing,
Zhang Jiaming,
Wang Xucheng,
Ma Ruichen,
Shen Yaqi
Publication year - 2022
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/gtd2.12435
Subject(s) - control theory (sociology) , transient (computer programming) , controller (irrigation) , inverter , fault (geology) , energy (signal processing) , computer science , voltage , engineering , electrical engineering , mathematics , control (management) , statistics , artificial intelligence , seismology , geology , agronomy , biology , operating system
A new transient stability control strategy for the Line‐Commutated‐Converter based High‐Voltage‐Direct‐Current (LCC‐HVDC) receiving‐end system based on the gradient of dynamic energy is proposed to deal with this problem. Firstly, in the whole process from fault occurrence to fault removal, a dynamic energy function representing the stability of the system is constructed. On this basis, considering the influence of Direct Current (DC) inverter side controller, the dynamic energy gradient expression under three‐phase and single‐phase short‐circuit fault scenarios is deduced in detail. The influence of control parameters on dynamic energy accumulation or consumption is analytically described. Then, the function term related to the inverter side controller is extracted from the dynamic energy gradient expression, the trigger pulse on the inverter side is controlled to keep the dynamic energy gradient of the DC port at the minimum. Finally, the hardware in the loop test is carried out on RT‐LAB. The test results show that in the process of receiving end fault, the DC port will inject dynamic energy to the receiving end system, making the system tend to be unstable. This method is able to reduce the dynamic energy accumulation rate of system and increase the critical clearing time of system.