Calculation of load current of self-excited voltage inverter by harmonic analysis

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Abstract

BACKGROUND. The paper discusses a single-phase bridge self-excited inverter operating into active inductive load. The load voltage is generated by switching the key circuit elements; the current shape is determined by the load parameters and characterized by the higher harmonic spectrum. In practice, the calculations are often focused on the effective inverter load current of a non-sinusoidal shape; its determination is associated with known computational difficulties.

AIM. To develop a method to calculate the effective value load current of a self-excited inverter that does not require decomposition of the current curve into a harmonic series and its subsequent summation.

METHODS. The effective inverter load current was calculated using the theory of residues.

RESULTS. The load current of a self-excited inverter calculated based on expressions obtained using the theory of residues allows to reduce the amount of computation and ensures high accuracy, which is confirmed by experimental studies.

About the authors

Boris A. Trifonov

Emperor Alexander I St.-Petersburg State Transport University

Email: trifoboba45@gmail.com
ORCID iD: 0000-0002-5816-3473
SPIN-code: 2262-9246

Cand. Sci. (Engineering), Associate Professor

Russian Federation, Saint-Petersburg

Gennady E. Sereda

Emperor Alexander I St.-Petersburg State Transport University

Author for correspondence.
Email: gennady.sereda@mail.ru
ORCID iD: 0000-0003-0754-6682
SPIN-code: 9682-8744

Cand. Sci. (Engineering), Associate Professor

Russian Federation, Saint-Petersburg

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2. Fig. 1. The shape of the load current curves of a single-phase bridge autonomous voltage inverter: a – R=194 Ohm, L=0.397 H; b – R=194 Ohm, L=0.2 H; c – R=194 Ohm, L=0.051 H

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3. Fig. 2. Results of the experimental study and calculations for the effective value of the load current (solid lines – calculation by harmonics and expression (15), dashed lines – experiment): 1 – R=47 Ohm; 2 – R=107 Ohm; 3 – R=194 Ohm

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Copyright (c) 2025 Trifonov B.A., Sereda G.E.

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This work is licensed under a Creative Commons Attribution 4.0 International License.

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