Abstract
In the last decade, many new structures of Impedance Source Networks have been presented and applied to a variety of powering systems. Electromagnetic Compatibility (EMC) testing is a required procedure, when introducing a new product to the market, in order to confirm that a particular device meets the required standards. The novelty presented in this article are the results of research on the conducted disturbance and radiated emission on five selected Impedance Source Networks (ISN) structures that were performed in a certified EMC chamber along with a discussion of these results. The description of the results will help designers to select the appropriate structure, and will help to determine the level of additional electromagnetic disturbances that can be expected by using the selected structure with respect to an inverter that does not use an impedance network structure. As yet, the research on radiated emission and conducted disturbances for Voltage Source Inverter (VSI) with ISN has neither been described nor analysed. The article concerns five Impedance Source Networks (ISN) structures.DOI: http://dx.doi.org/10.5755/j01.eie.23.3.18333
Highlights
Using a Z-Source type of an Impedance Source Network (ISN) [1] to step-up the input DC voltage is a solution that has been used for the past ten years to increase the output voltage of a Voltage Source Inverter (VSI)
The influence on the control transfer function determines affects the dynamic characteristics of a VSI with impedance networks [7], [8]
The entire range was split into two zones for the analysis, which – as in the case of the conducted disturbances – were divided into compartments that had the characteristics of the higher and lower volatility levels that were recorded for the radiated emission
Summary
Using a Z-Source type of an Impedance Source Network (ISN) [1] to step-up the input DC voltage is a solution that has been used for the past ten years to increase the output voltage of a Voltage Source Inverter (VSI). The authors of [14] presented a method of a control algorithm for inverter Hbridge switches that influenced the registered radiated emission and conducted disturbance. The basic method of control, which is called a Constant Boost Control, was used in this work In this solution, the dZ coefficient (“shoot through” state) is constant, and its influence on the results that are obtained are limited. The energy is stored in the inductance in a “shoot through” state, which is implemented by switches in the H-bridge inverter in its zero states (when the input voltage of the output filter LFCF is zero). One disadvantage of an impedance network is the large power losses in the “shoot through” state – an additional current impulse goes through the switches in the H-bridge inverter.
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