Open AccessResearch on small‐signal stability of hybrid multi‐terminal HVDC system and control system parameter design
Author(s) -
Hailin Zhang,
Shujun Yao,
Peng Zhan
Publication year - 2017
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2017.0760
Subject(s) - root locus , voltage source , high voltage direct current , control theory (sociology) , transmission system , modular design , waveform , small signal model , inverter , rectifier (neural networks) , signal (programming language) , computer science , transmission line , control system , voltage , direct current , electronic engineering , engineering , transmission (telecommunications) , control (management) , electrical engineering , telecommunications , stochastic neural network , artificial intelligence , machine learning , recurrent neural network , artificial neural network , programming language , operating system
By combining the advantages of both line commutated converter (LCC) and voltage source converter (VSC), the hybrid high‐voltage direct current (HVDC) transmission system has extensive application prospects. Firstly, this study presents the small‐signal model of hybrid multi‐terminal high‐voltage direct current transmission (HMT–HVDC) system whose rectifier is LCC and inverter is VSC under the d and q rotating coordinate system. This article adopts the modular modelling; the system can be divided into four parts: converter, control system, AC system, and DC lines. Those modules connect each other by the input and output relations, which helps analyse the modules separately if necessary. At the same time, the corresponding detailed electromagnetic transient (EMT) model is also established based on PSCAD/EMTDC. Then two models are compared under the small disturbances in time‐domain in details. The simulation results show that the output waveform of the two models is almost completely overlap, which prove the small‐signal model is correct. Then, this study analysis the influence of control parameters on the stability of VSC–MTDC based on the small‐signal model by using the root locus method.