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  5. Device for controlling autonomous voltage inverter with sinusoidal law of pulse-width modulation, invariant to system engine start error

Device for controlling autonomous voltage inverter with sinusoidal law of pulse-width modulation, invariant to system engine start error

V. Bashinskyi, A. Denisov, A. Bursala, O. Bursala, O. Shapovalоv
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Description: For the system for launching an aircraft engine of a military transport aircraft, in which the power supply to the asynchronous starter-generator is carried out from an autonomous inverter with a sinusoidal law of pulse-width modulation of the output voltage, the need for correction of the system error signal during the transient process is shown. The form of the error signal for the launch of the gas turbine engine of the aircraft, which includes the exponential and trigonometric components, is established. They are superimposed on a sinusoidal signal (the law of modulation) and distort its shape. As a result, there is an increase of higher harmonics at the output of the autonomous voltage inverter, which feeds an asynchronous starter-generator, which leads to an increase in electromagnetic power losses in it and electromagnetic interference. In order to reduce the effect of the error signal form on the sinusoidal law of pulse-wide modulation, it is proposed to add blocks of correction of the error signal form to the autonomous inverter control system. To do this, the error of the current circuit passing through its regulator is directed to the input of the non-recursive digital filter and then to the multiplier. At its output, there is a product of a sinusoidal function and corresponding value of the lattice function from output of the digital filter. The analysis showed that during the transition process, in the absence of the correction of the waveform signal, the ampli-tudes of the higher harmonics of the voltage at the output of the autonomous inverter by (8…10) % exceeds their values in steady state. In this case, the highest amplitudes have pair harmonics, which are not in steady state. When activated in the control unit of autonomous inverter correctional units, the harmonic coefficient of its output voltage at the launching aviation engine is reduced by (5…20) % depending on the switching frequency. As a result, the electromagnetic power losses in the asynchronous starter-generator will be reduced.


Keywords: system engine start error, digital filter, zero order lock, multiplier, transition process, harmonic coefficient, autonomous voltage inverter

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Reference:
 Bashynskyi, V.H., Denysov, O.I., Bursala, O.L., Bursala, O.O. and Shapovalov, O.L. (2019), “Prystrii upravlinnia avtonomnym invertorom napruhy z synusoidalnym zakonom shyrotno-impulsnoi moduliatsii, invariantnym do pomylky systemy zapusku aviadvyhuna” [Device for controlling autonomous voltage inverter with sinusoidal law of pulse-width modulation, invariant to system engine start error], Systems of Arms and Military Equipment, No. 1(57), pp. 7-14. https://doi.org/10.30748/soivt.2019.57.01.