DC-link current estimation for load-side converter of brushless doubly-fed generator in the current feed-forward control

被引:15
|
作者
Wang, Xingwei [1 ]
Lin, Hua [1 ]
机构
[1] Huazhong Univ Sci & Technol, State Key Lab Adv Electromagnet Engn & Technol, Wuhan, Peoples R China
关键词
brushless machines; electric current control; machine control; AC-DC power convertors; PWM power convertors; voltage control; stability; DC generators; load-side converter; brushless doubly-fed generator; current feed-forward control; BDFG control system; back-to-back converter; machine-side converter; MSC; LSC; three-phase AC-DC pulse width modulation converter; double-loop control strategy; outer voltage loop; inner current loop; load disturbance; complex harmonic spectrum; DC-link current estimation algorithm; equivalent circuit; CONTROL SCHEME; PWM CONVERTER; EQUIVALENT-CIRCUIT; INVERTER SYSTEM; FED MACHINES; PERFORMANCE; RECTIFIER; MODEL; CAPACITOR;
D O I
10.1049/iet-pel.2015.0910
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
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.
引用
收藏
页码:1703 / 1710
页数:8
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