Harmonics and Sideband Frequencies in Cycloconverters Beyond 5th, 7th, 11th, and 13th Orders

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Resource Overview

Addressing the primary characteristics of cycloconverters, which generate not only 5th, 7th, 11th, and 13th order harmonics but also sideband frequencies resulting in rich harmonic content, a filter device solution was selected. The filter type was determined, and engineering design calculations were performed for filter parameters. The TCR+FC type SVC compensates for the imbalance in the rolling mill system by independently controlling phase-to-phase adjustments to regulate capacitive and inductive reactance in the three-phase power supply, thereby reducing losses in the 35KV power grid. Code implementation involves real-time harmonic analysis algorithms and dynamic control logic for reactive power compensation.

Detailed Documentation

To address the issues of 5th, 7th, 11th, and 13th order harmonics and sideband frequencies generated by cycloconverters, we conducted a selection process for filter device solutions and determined the appropriate filter type. Additionally, we performed engineering design calculations for the filter parameters. Furthermore, we implemented a TCR+FC type SVC to compensate for imbalances in the rolling mill system. Through independent phase-to-phase control, this system adjusts the capacitive and inductive reactance of the three-phase power supply, effectively reducing losses in the 35KV power grid. These measures incorporate harmonic detection algorithms and control logic implemented in programmable controllers to dynamically mitigate harmonic content, thereby enhancing system stability and reliability.

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