Discrete time model based multiple paths full feedforward control for three‐phase inverter with output transformer

Abstract In a high‐power three‐phase voltage source inverter, a step‐up transformer may be used at the output of the LC filter to achieve higher output voltage, improve electromagnetism compatibility and serve as output inductor under parallel operation. However, under standalone operation, the performance of the inverter is degraded since the feedback control does not include the output voltage of the transformer. This paper proposes a multiple paths load current full feedforward control designed in discrete time domain to improve the performance of the inverter. The proposed full feedforward controller has a concise expression due to multiple feedforward paths, and it is easy to fit in other control structures. Additionally, direct analysis in discrete time domain offers an accurate approach to investigate the relationships of the variables, and the improper fractions in the full feedforward controller can be handled with fewer trade‐offs. A lower output impedance is achieved eventually. MATLAB/Simulink is used to present the handling of advance operator z, ringing phenomenon and transformer dynamic. Experiments of a TMS320F28335 processor based 75 kVA three‐phase inverter with output transformer prove that the proposed controller can further improve the dynamic and steady‐state performance of the inverter under linear and nonlinear loads.

Abstract licence: CC BY-ND

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