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1. (WO2017041428) MODELLING METHOD AND SYSTEM FOR DIODE CLAMPED CASCADED MULTI-LEVEL CONVERTER

Pub. No.:    WO/2017/041428    International Application No.:    PCT/CN2016/073510
Publication Date: Fri Mar 17 00:59:59 CET 2017 International Filing Date: Fri Feb 05 00:59:59 CET 2016
IPC: H02M 7/483
H02M 7/5387
G06F 17/50
Applicants: ELECTRIC POWER RESEARCH INSTITUTE. CHINA SOUTHERN POWER GRID
南方电网科学研究院有限责任公司
Inventors: ZHOU, Yuebin
周月宾
RAO, Hong
饶宏
XU, Shukai
许树楷
LI, Xiaolin
黎小林
HUANG, Ying
黄莹
Title: MODELLING METHOD AND SYSTEM FOR DIODE CLAMPED CASCADED MULTI-LEVEL CONVERTER
Abstract:
A modelling method and system for a diode clamped cascaded multi-level converter. All corresponding diodes of each bridge arm are equivalent to an auxiliary diode; all corresponding capacitors of each bridge arm are equivalent to a controlled voltage source; and power modules of each bridge arm are connected in series to be equivalent to an equivalent module, the equivalent module comprising a loss resistor and a composite equivalent model connected to the loss resistor. Since a plurality of components, at the same positions, in each power module of each bridge arm of the diode clamped cascaded multi-level converter are equivalent to a component, the node voltage equation order can be reduced, the simulation efficiency is improved, and the simulation efficiency cannot be reduced with the increase in the number of power modules. By means of modelling according to the modelling method and system, the demands for flexible direct current power transmission engineering parameter design, control strategy verification and the like of a long-distance, high-capacity and overhead line occasion can be satisfied.