Coordinated Implementation of Control Delay and First-Order Unstable Filter for Capacitor-Voltage-Feedforward-Based Active Damping
摘要
Compared to the capacitor current feedback (CCFB) active damping (AD), the capacitor voltage feedforward (CVFF) AD is more favored due to the lack of the current sensor. However, the relationships between the delay configuration and the phase-lead compensators are overlooked. Therefore, the performance of the CVFF/CCFB with different digital control delay configurations is analyzed first, which reveals that the design rules of the phase compensator should be specially designed. A first-order unstable filter is proposed to realize the phase compensation of the CVFF-AD, which is accompanied by the coordinated implementation of the control delay. The parameter tuning process of the filter is elaborated, which enables the positive damping up to almost Nyquist frequency. Finally, the experimental results verify the effectiveness of the proposed CVFF-AD in damping the resonances.