Secure Implementation of Active Power Filters Using a Dual Cascaded Second-Order Time-Delay Filter

Active power filters (APFs) play a crucial role in improving power quality in grid networks. They mitigate load's harmonic and reactive currents, ensuring unity power factor grid operation with sinusoidal currents. However, the accuracy of compensation provided by APFs can be compromised due to the vulnerability of their control parameters to adversarial manipulations. In this letter, we investigate, detect and mitigate such vulnerabilities within the framework of a recently proposed dual cascaded second-order time-delay filter for APFs. Our findings reveal that if exploited, these vulnerabilities can lead to increased power losses in APFs and significant degradation in the grid power factor. This study emphasizes the critical need to integrate security considerations into APF design, thereby enhancing their resilience against events such as adversarial parameter manipulation attacks.