Correction: Xia, C.; Hou, X.; Chen, F. Flux-Angle-Difference Feedback Control for the Brushless Doubly Fed Machine. Energies 2018, 11, 71

The authors wish to make the following corrections to this paper [1] due to an accidental mistake when uploading the last manuscript:

On page 6, Equation (17) should be changed from:

$$\frac{d\delta }{dt}=\frac{d{\theta }_c}{dt}-\frac{d{\theta }_p}{dt}=\frac{\left|{u^{\prime }}_{cs}^{\alpha \beta }\right|\sin {\theta }_{us}}{\left|{{\psi }^{\prime }}_{cs}^{\alpha \beta }\right|}-\left[{\omega }_p-\left(p_p+p_c\right){\omega }_r\right]$$

(17)

To the following correct version:

$${u^{\prime }}_{cs}^{\alpha \beta }=\frac{2}{3}{V}_{bus}{e}^{j\left(\pi /3\left(n-1\right)\right)}$$

(17)

The authors would like to apologize for any inconvenience caused to the readers due to this mistake and the subsequent changes.