Research content
Active damping (AD) strategy is an economical and efficient method to solve the resonant problem of the permanent magnet synchronous motor (PMSM) drive system with LC sine wave filter. In this article, the AD methods used in PMSM drive system are classified as inherent damping (ID), state variable feedback, and digital filter. Based on this, the purpose of this article is to provide an overview and analysis of the AD methods on PMSM drive system in recent years, and to comprehensively review, compare, and summarize the stability, dynamic performance, robustness, and algorithm complexity. Furthermore, a new expansion of AD method based on capacitor current feedback with high-pass filter (HPF-CCF) is studied to ensure the effectiveness when the resonant frequency is around sixth of the sampling frequency. The simulation and experimental results validate the effectiveness of theoretical analysis.
The research results and their significance
(1) This article summarizes and analyzes the implementation methods of active damping corresponding to various virtual resistor placement positions, and provides suggestions for simplifying the design of active damping based on this.
(2) The existing active damping strategies in the field of PMSM control with LC filter were extended and an active damping strategy based on high pass filter capacitor current feedback (HPF-CCF) is studied. Through theoretical analysis, simulation, and experimental verification, the advantages of HPF-CCF method in dynamic performance and robustness were demonstrated, and it can effectively overcome the resonance suppression problem when the resonance frequency approached one sixth of the sampling frequency.
Future outlook
Future Developments FOR LC-filtered PMSM Drives
Topics
Challenges
Expansion of the state variable feedback in
Table I
Reasonable simplification of higher-order items is required
AD methods under ICF
The inverter side currents need to be compensated to accurately control the motor currents
Employ state observers to reduce the use of measurement sensors
The influence of the observer on the design of AD parameters needs to be considered
Expansion of some methods in grid-connection inverters
AD parameters need to be redesigned
Consider parameter identification to mitigate the impact of system parameter variations on the effectiveness of AD
The parameters of the LC sine wave filter require identification
The complete study is accessible Via DOI: 10.30941/CESTEMS.2025.00028
CES Transactions on Electrical Machines and Systems
Experimental study
Not applicable
Review and New Expansion of the Active Damping Strategy of the PMSM Drive System with LC Sine Wave Filter
25-Sep-2025