Maximum Torque Per Ampere (MTPA) Control for Interior Permanent Magnet Synchronous Machine Drives Based on Virtual Signal Injection

Abstract

This paper introduces a novel virtual signal injectionbased control method for maximum torque per ampere (MTPA) operation of interior permanent magnet synchronous machine (IPMSM) drives. The proposed method injects a small virtual current angle signal mathematically for tracking the MTPA operating point and generating d-axis current command by utilizing the inherent characteristic of the MTPA operation. This method is parameter independent in tracking the MTPA points, and it does not inject any real signal to current or voltage command. Consequently, the problems associated with real high-frequency signal injection, such as increases in copper and iron loss can be avoided. Moreover, it is robust to current/voltage harmonics and motor torque disturbances. The proposed method is verified by simulations and experiments under various operating conditions on a prototype IPMSM drive system. Index Terms-Interior permanent magnet synchronous machine (IPMSM) drives, maximum torque per ampere (MTPA), signal injection, virtual signal injection control (VSIC).

MTPA Control of IPMSM Drives Based on Virtual Signal Injection Considering Machine Parameter Variations

“…The virtual signal injection based control schemes for MTPA operation have been reported in recent years [20]- [22]. This kind of control schemes can track the MTPA points online without injecting any real signals into motor.…”

“…As described in [22], [26], based on Taylor's series expansion, the left hand side of (9) and (10) can be expressed as (14) and (15), respectively. (14) ( 15) According to (14) and (15), and contain the information of and , respectively.…”

A Novel Optimal Current Trajectory Control Strategy of IPMSM Considering the Cross Saturation Effects

“…Hence, the correction point should locate at the intersection of the voltage request line and the current limit circle, which is also the nearest point to the torque request line. The result can be computed as Equation (21). At the start of current trajectory control, the prior criterion is the distance between the origin point and the voltage variation request line LU.…”

“…Hence, the correction point should locate at the intersection of the voltage request line and the current limit circle, which is also the nearest point to the torque request line. The result can be computed as Equation (21).…”

Fuzzy Maximum Torque per Ampere and Maximum Torque per Voltage Control of Interior Permanent Magnet Synchronous Motor Drive

“…(6) A novel virtual signal-injection-based control method for MTPA operation of IPMSM drives is also introduced. (9) Control issues on the conventional proportional-integral-derivative (PID) controller, modelreference adaptive controller (MRAC), sliding-mode controller (SMC), and so forth (10,11) have been studied for many years. The designs of these controllers may rely on the exact machine model and accurate model parameters.…”