Predictive current control of saturated cross-coupled permanent magnet synchronous machines

Abstract

Abstract-Highly utilized permanent magnet synchronous machines show magnetic saturation and cross-coupling effects. These phenomena are described by nonlinear differential equations and make feedback current control of the machine challenging. State of the art current control methods usually ignore these effects and hence do not produce optimal results in transient operation or in operation at the inverter voltage limit. Therefore, this paper presents a method to design a current controller taking into account saturation and dynamic crosscoupling. Feed forward calculation of transient quantities in realtime enables complete decoupling and dead-beat behavior which is experimentally validated by test bench measurements. With this approach, strongly nonlinear, highly utilized synchronous machines can be successfully controlled achieving best control quality in all operational conditions.

Predictive current control and online parameter identification of interior permanent magnet synchronous machines

“…This is possible because the cross-saturation inductances L dq , L qd are a lot smaller than the self-inductances L dd , L qq in IPMSMs. For the machine under test they are at least five times smaller in the typical operational area [2].…”

“…The electromagnetic behavior of the machine has to be known to allow dynamic, stable and accurate control of these machines. Precise machine models with parameter lookup tables (LUT) are applied for that purpose [1,2,3]. The parameters are given by the flux linkages, the inductances and the stator resistance and have to be identified before control is possible.…”

Dynamic control of generalized electrically excited synchronous machines using predictive flux control

“…The second drawback is that conventional controllers such as the PI-controller yield poorer dynamics compared to predictive controllers [19]. Regarding EESMs, this is of major concern as the inductance of the rotor winding is often much greater than the stator inductance [13], [14].…”

FPGA-based real-time simulation of nonlinear permanent magnet synchronous machines for power hardware-in-the-loop emulation systems

“…3) is a DSP from Texas Instruments (TMS320C6748) which executes the machine controller with a control frequency of f c = 8 kHz. The HIL simulator is controlled by a nonlinear current controller for saturated crosscoupled PMSMs described in [13]. Since the current hardware setup is only designed for low-level signals, the machine controller pulses a small signal six-pulse bridge, realized with bipolar transistors, to generate the required pulsed output voltage for the A/D-converter of the signal processing unit.…”