Optimization control method for dynamic performances of active power filter of microgrid

Abstract

The invention discloses an optimization control method for dynamic performances of an active power filter of a microgrid. A harmonic current detection link employs a combined filter of a specific subharmonic wave trap and a low-pass filter, wherein the specific subharmonic wave trap filters low-order harmonics, and the low-pass filter is wider in frequency band and filters high-order harmonics, thereby effectively overcoming the conflict between the bandwidth and response time of a conventional filter. A current control link carries out the independent control of a fundamental current and a harmonic current in a dq synchronous rotation system, thereby solving a problem that a DC side voltage drops during load varying. According to a control strategy, an AC side current and a DC side voltage are better in dynamic response and stability, and the method is suitable for the active power filter of the microgrid. The method is higher in harmonic detection speed, and is better in dynamic performance.

Description

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AI Technical Summary

Benefits of technology

This technology improves upon existing filters by combining two different techniques - one uses a special type called an LF (low pass) filter with certain frequency components that help detect interference signals better than other types like SAW or CMOS sensors. Another technique involves controlling both AC signal power and noise levels individually for faster responses without affecting their accuracy.

Problems solved by technology

This patented technical problem addressed in this patent relates to improving the efficiency at detecting fast harmons from electrical systems due to their complex nature. Traditional methods have limitations including slow response times or imprecise phase correction values. An improved approach called Active Power Filter Control System (APCF), described in detail below, provides a solution through advanced mathematical techniques like partial integrals and quaternions. However, APFC also faces challenges related to stability issues caused by adding higher pass filters during filtering process.

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