Dynamic analysis of current regulators for AC motors using complex vectors

Abstract

Abstract-The analysis and design of current regulators for polyphase ac loads is presented using complex vector notation. The ac motor current regulation problem is analyzed by studying both the command tracking and disturbance rejection capability of the current regulator. The use of complex vector notation and the generalization of classical control tools like root locus, frequency-response functions, and dynamic stiffness functions to complex vectors provide a way of comparing the performance of different controller topologies. Limitations in the performance of the synchronous frame proportional and integral current regulator are outlined, and several ways of improving its performance are suggested and investigated.Index Terms-AC current regulators, complex vector analysis, complex vector controls design.

Fault-Tolerant Control of Five-Phase Induction Motor Under Single-Phase Open

“…Fortunately, PR regulator can realize zero ac current error in the phase frame, because the resonant term has large gain at the target frequency, which can achieve good response in the fault occurrence [21][22].…”

“…Switching state of inverter is set to high or low, depending on its error moving outside of fixed hysteresis width [21] …”

“…The precise matched comparative analysis of different current regulation strategies is discussed in [21], which is in the application of three-phase IM under healthy condition. A theoretical connection between PR and synchronous frame PI regulators is established in [22].…”

“…A theoretical connection between PR and synchronous frame PI regulators is established in [22]. Hysteresis current control is widely used for its simplicity, but it results in much more harmonic current [17][18][21][22]. The simple PI regulator realizes the excellent dc current control.…”

Sensorless control of PMSM drives using a combination of voltage model and HF signal injection

“…4. The current control is implemented as PI-type control in the estimated rotor reference frame, where the cross-coupling terms and the back-emf are decoupled [22]. The current is predicted one sampling period ahead [23], [24].…”