Abstract
This article presents a non-AC-side voltage sensor control method applied to More Electric Aircraft rectifiers. The control strategy can operate properly over a wide range of frequencies. This strategy calculates the AC supply frequency through an instantaneous phase-locked loop and feeds it back to a dual low-pass filter. The reconstructed rectifier-side voltage is filtered using two low-pass filters with different scale factors. Then, the values of the two filter outputs are subtracted and the effect of the DC bias due to the initial value of the integration is eliminated. The subtracted value is amplitude-phase compensated to calculate the virtual flux value. The phase angle can then be calculated from the virtual flux value. This phase angle is used for the implementation of the voltage-oriented vector control and as an input to the instantaneous phase-locked loop. Simulation and experimental results show that the use of dual low-pass filters under different frequency conditions improves the speed and accuracy of virtual flux estimation and eliminates DC-side bias errors.
Highlights
Some commercial transport aircraft use main generators connected directly to the jet engines via gearboxes to generate electricity
Compared with a constant frequency AC power supply, it has the following characteristics: firstly, the application of a variable frequency AC starter improves the disadvantage that constant speed and constant frequency AC power cannot start an aero-engine; secondly, the efficiency of the power generation system is increased from 70% to 90% of the constant speed and constant frequency AC power supply, which creates the conditions for increasing the power capacity
In order to solve the problem of the DC bias and amplitude-phase errors of virtual flux linkage under broadband conditions, a virtual flux voltage-oriented vector control strategy based on dual low-pass filters is proposed in this article
Summary
Some commercial transport aircraft use main generators connected directly to the jet engines via gearboxes to generate electricity. The researchers in [20] proposes a frequency-adaptive virtual flux linkage estimation method which configures a second-order generalized integrator as a quadrature signal generator This method can operate under the condition of frequency variation or grid imbalance, but its structure is complex, and using the parameters of the PI controller will affect the accuracy. In order to solve the problem of the DC bias and amplitude-phase errors of virtual flux linkage under broadband conditions, a virtual flux voltage-oriented vector control strategy based on dual low-pass filters is proposed in this article. A virtual flux voltage-oriented vector control method of wide frequency active rectifiers based on the dual low-pass filter is designed in this paper for More Electric Aircraft.
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