4 / 2023-07-22 09:56:15

Sensorless Control of Reduced DC-Link Capacitance IPMSM Drives Using Improved Flux Linkage Observer

Interior permanent magnet synchronous motor,reduced dc-link capacitance,sensorless control,flux linkage observer,reduced order quasi resonant filter

7.Electric Machine Design and Control > (2)、Electric machine control

The interior permanent magnet synchronous motor (IPMSM) drives using small capacitance film capacitors has the advantages of long lifespan, low cost, and high-power density. However, the dc-link voltage contains twice the frequency fluctuation of the grid-side voltage, which will cause a lot of harmonics in the back electromotive force (BEMF) and flux linkage. Eventually this will result in a large position estimation error in the sensorless control based on the BEMF model. Aiming at that, this paper proposes a flux linkage observer (FLO) to estimate the rotor position and speed. The characteristics of the reduced dc-link capacitance system is analyzed firstly, and the frequency of harmonics is determined. Secondly, based on the FLO, a novel composite reduced order quasi resonant filter (CROQRF) is designed to realize accurate extraction of the fundamental component of the flux linkage. In addition, an orthogonal phase-locked loop (PLL) is added to estimate the rotor position and speed. Finally, the effectiveness of the proposed strategy is verified by experimental results.