Open AccessDC‐link current estimation for load‐side converter of brushless doubly‐fed generator in the current feed‐forward control
Author(s) -
Wang Xingwei,
Lin Hua
Publication year - 2016
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2015.0910
Subject(s) - control theory (sociology) , voltage , current (fluid) , converters , harmonic , pulse width modulation , three phase , generator (circuit theory) , direct current , power factor , computer science , power (physics) , engineering , electrical engineering , control (management) , physics , quantum mechanics , artificial intelligence
In the stand‐alone brushless doubly‐fed generator (BDFG) control system, there are two back‐to‐back converters composed of the machine‐side converter (MSC) and the load‐side converter (LSC). The LSC is a three‐phase AC–DC pulse width modulation converter which usually adopts the double‐loop control strategy with outer voltage loop and inner current loop. The introduction of the DC‐link current feed‐forward for improving the dynamic performance of the LSC can reduce the effect of the load disturbance to the system. However, the DC‐link current has a complex harmonic spectrum with the MSC connected to the DC side, so its average value is not convenient to measure. This study presents a DC‐link current estimation algorithm for the current feed‐forward control in the LSC of the stand‐alone BDFG. With the help of the equivalent circuit of the BDFG and the power balance, the rapid calculation of the average DC‐link current can be estimated as well. With this estimation of the current instead of the actual DC‐link current, the DC‐link voltage and AC side current of the LSC can achieve stability quickly. The effectiveness and correction is validated by the simulation and experiments.