An Improved dq-120 Algorithm Considering Decaying DC Component and Its Application in Hybrid Simulation

doi:10.3969/j.issn.1000-7229.2016.06.007

Abstract

Abstract:

This paper analyzes the error forming principle of traditional dq-120 algorithm when the fault current containing decaying DC component and its display form. On this basis， an improved dq-120 algorithm is proposed combined with Prony algorithm. The improved algorithm can reduce the model order for the dq-120 calculation results of fault current based on the assumption that the fault current contains DC component， simplify the calculation of traditional Prony algorithm and improve the immune level of dq-120 algorithm to the DC component. With using PSCAD/EMTDC simulation software， we build an electromechanical-electromagnetic hybrid transient simulation model of IEEE 39-node system with a DC link. The simulation result shows that， compared with traditional dq-120 algorithm， the improved algorithm improves the phasor extraction accuracy of current during fault， so as to improve the accuracy of electromechanical-electromagnetic hybrid transient simulation during fault as well as the whole simulation process.

Key words: decaying DC component, dq-120, Prony algorithm, hybrid simulation, PSCAD

CLC Number:

TM 743

YANG Yang， XIAO Xiangning， TAO Shun， CHEN Pengwei. An Improved dq-120 Algorithm Considering Decaying DC Component and Its Application in Hybrid Simulation[J]. Electric Power Construction, 2016, 37(6): 43-48.

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