Control Strategy for Voltage Source Converter-Based HVDC System Under Unbalanced Voltage Conditions

被引：0
|
作者：
Zhang Mingguang [1 ]
Wang Diaobing [1 ]
Zhang Zhongkuan [1 ]
机构：
[1] Lanzhou Univ Technol, Sch Elect & Informat Engn, Lanzhou 730050, Gansu, Peoples R China
来源：
INDUSTRIAL DESIGN AND MECHANICS POWER II | 2013年 / 437卷
关键词：
Voltage source converter; unbalanced fault; the inner current controller; positive and negative sequence current decomposition; proportional resonant controller; carrier amplitude adjustable;
D O I：
10.4028/www.scientific.net/AMM.437.629
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The mathematical model of voltage source converter-based flexible DC transmission system(VSC-HVDC) and traditional fault control strategy are comprehensively analyzed. The proportional resonant controller in the traditional dual vector current controller is proposed to simplify the structure of traditional inner current controller. The proposed method improves the response speed and control accuracy of the control system. According to the output voltage distortion caused by the DC voltage ripple, the PWM with amplitude-adjustable carrier is adopted, and according to the DC side voltage rise the power setting value is adjusted. Finally, the control strategy is verified by the electromagnetic transient simulation software PSCAD/EMTDC, the simulation results show it can effectively restrain the fault overvoltage, improve the operation ability of the system.
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页码：629 / 633
页数：5
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