Abstract
This paper proposes an extended structure of a programmable low-pass filter (PLPF) for direct filtering of three-phase variables in automotive AC drives. The PLPF adjusts its cut-off frequency according to the synchronous frequency of the AC motors. Moreover, it compensates gain attenuation and phase delay of the fundamental component signal. The conventional PLPF can only be applied to variables in the stationary reference frame. In order to obtain filtered three-phase variables, an inverse reference frame transformation is required. However, the extended structure, which includes reference frame transformations, can be directly applied to three-phase variables and remove the noise in the earlier stage before transformation. The extended PLPF is more useful for making signal flows clear and intuitive when organizing an algorithm that directly requires three-phase variables. The extended PLPF requires a moderate computational load corresponding with that of the conventional PLPF because its formula is simplified by use of Kirchhoff’s law. The reduction in the execution time is critical for implementing the filter based on low-cost microcontrollers. Using case studies, dead-time compensations and open-phase fault detection for AC drives show the effectiveness of the extended PLPF.
Highlights
Accurate rotor position information is indispensable for high-performance alternating current (AC) electric drives in automotive applications
Novel algorithms thatbeen directly that directly three-phase variables without variable transformation have deuse three-phase variables without variable transformation haveopen-loop been developed for varveloped for various purposes in closed-loop and cases, e.g., inious purposes in closed-loop butaalso open-loop e.g.,currents inverter[13,14], dead-time verter dead-time compensation based on polarity check cases, of phase and compensation based on a polarity check of phase currents [13,14], and inverter open-switch inverter open-switch fault detection based on measurements of phase voltages fault Use detection based on measurements of phase voltages of the conventional programmable low-pass filter (PLPF) and inverse transforms to obtain filtered three-phase
This paper proposes an extended structure of a programmable low-pass filter (PLPF) and compares it with the conventional PLPF
Summary
Accurate rotor position information is indispensable for high-performance alternating current (AC) electric drives in automotive applications. In contrast with the general LPF, the PLPF adjusts its cut-off frequency according to the synchronous frequency of the AC motors It compensates for gain attenuation and phase delay of the fundamental component signal [7]. In order to obtain filtered three-phase variables, an inverse reference frame transfortransformation is required. Fault Use detection based on measurements of phase voltages of the conventional PLPF and inverse transforms to obtain filtered three-phase. PLPF andflows inverse transforms to obtain filteredvariables three-phase variables results in complicated signal that include both three-phase and variables results in complicated signal flows that include both three-phase variables and variables in the stationary reference frame. This in paper proposes an extended structure of a programmable low-pass filter (PLPF). Intuitive when organizing an algorithm that directly requires three-phase variables
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