Abstract
An inertial response emulated control strategy of doubly-fed induction generators (DFIGs) is able to arrest their frequency decline following a severe frequency event. Nevertheless, the control coefficient is unchanged, so as to limit the benefit potentiality of improving the inertial response capability for various disturbances and provide less of a benefit for boosting the frequency nadir. This paper addresses an enhanced inertial response emulated control scheme for a DFIG to improve the maximum frequency deviation and maximum rate of change of frequency for various disturbances. To this end, the control coefficient is coupled with the system frequency deviation so as to regulate the control coefficient according to the system frequency deviation (i.e., sizes of the disturbance). Results clearly indicate that the proposed inertial response emulated control strategy provides better performance in terms of improving the maximum rate of change of frequency and maximum frequency deviation under various sizes of disturbance and random wind speed conditions.
Highlights
The wind generation has been continuously growing to reduce the issues of air pollutants and energy shortages [1,2]
This paper addresses an enhanced inertial response emulated control scheme for a doubly-fed induction generators (DFIGs) to enhance the maximum df/dt and frequency deviation for various disturbances
The control coefficient is coupled with the system frequency deviation so as to regulate the control coefficient according to the variation of the system frequency deviation
Summary
The wind generation has been continuously growing to reduce the issues of air pollutants and energy shortages [1,2]. The unchanged control coefficient of the inertial response emulated control scheme restricts the benefit of improving the inertial response capability. It has a large possibility for causing over-deceleration (stalling). This paper addresses an enhanced inertial response emulated control scheme for a DFIG to enhance the maximum df/dt and frequency deviation for various disturbances. To this end, the control coefficient is coupled with the system frequency deviation so as to regulate the control coefficient according to the system frequency deviation (sizes of the disturbance). The benefits of the proposed inertial response emulated control scheme are indicated with various disturbances and speed conditions
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