Title :
A hybrid derivative feedback control for VSG-based VSC to improve dynamic response characteristic
Author :
Fang Liu ; Xing Zhang ; Rongliang Shi ; Haizhen Xu ; Lei Tao
Author_Institution :
Sch. of Electr. Eng. & Autom., Hefei Univ. of Technol., Hefei, China
Abstract :
With high power Virtual Synchronous Generator (VSG)-based Voltage Source Converter (VSC) and low switching frequency, time delay has become a big issue affecting VSC stability and dynamic response in islanded mode. In this paper, effect of time delay on output impedance is analyzed and a hybrid derivative feedback control is proposed to improve system stability and dynamic response. First step, derivative feedback compensator of control variable is adopted to improve system stability and then, derivative feedback equation of state variable is adopted to improve dynamic response. Time delay is also discussed and compensated to improve dynamic response furthermore. The control method is verified by both analytical model, time simulations and experiment results.
Keywords :
delays; distributed power generation; dynamic response; electric impedance; power system control; power system stability; switching convertors; synchronous generators; VSG-based VSC; derivative feedback equation; dynamic response characteristic improvement; high power virtual synchronous generator-based voltage source converter; hybrid derivative feedback compensator control variable; islanded mode; low switching frequency; output impedance; power system stability improvement; time delay; Delay effects; Feedback control; Impedance; Power system stability; Pulse width modulation; Stability analysis; Voltage control; VSG; dynamic response; hybrid derivative feedback control; time delay;
Conference_Titel :
Electronics and Application Conference and Exposition (PEAC), 2014 International
Conference_Location :
Shanghai
DOI :
10.1109/PEAC.2014.7038032
