Normalization of non-sinusoidality indicators of magnetoelectric generator under an autonomous mode of operation

The object of this study is a magnetoelectric generator with an excitation system based on permanent magnets and an additional magnetic system in the form of ferromagnetic shunts. This paper considers the task of non-sinusoidal voltage in a local electrical network with a magnetoelectric generator. This phenomenon negatively affects the operation of consumers and reduces the energy efficiency of the system. The work investigates the causes of harmonic distortion and proposes a method for reducing their impact. This helps ensure stable and high-quality operation of consumers in the electrical network. The generated voltage was studied in terms of non-sinusoidality for a magnetoelectric generator at different load levels in isolated operation. The non-compliance of the generated voltage with the requirements of the current standard in terms of the relative voltage of individual harmonics and the total harmonic distortion factor (THDU) was established. The dependences of the relative voltage of harmonics on the generator load level in the range from idle to nominal load were determined. The parameters of single-frequency resonant filters were calculated, which enable the normalization of the generated voltage according to the non-sinusoidality indicators under the conditions of isolated operation of the generator with a rated load. A feature of the results is the design of adaptive voltage non-sinusoidality filters that take into account the specificity of operation of the magnetoelectric generator in the local network. Analysis of the generator output voltage revealed that under an isolated operation mode, it is necessary to install filters of the 3rd, 5th, 9th, 21st, and 23rd harmonics in the entire generator load range. The absence of harmonic resonance phenomena is shown if filters with fixed parameters are used in the generator load range from idle to rated load