Analysis and compensation of the rotor position offset error and time delay in field‐oriented‐controlled PMSM drives

Abstract

In high-performance field-oriented control of permanent magnet synchronous machines (PMSMs), an accurate rotor position is indispensable for the key roles in coordinate transformations. However, due to the rotor position offset error and the time delay in digital control systems, it is still challenging to obtain exact rotor position information. In this study, the influence of rotor position error on the control performance of a PMSM drive system is analysed first. Then, two novel compensation technologies, i d regulation and i q = 0 methods, are proposed to accurately compensate for the rotor position for both current and voltage coordinate transformations. The advantage of the proposed scheme is that even without any prior knowledge of the system delay, the rotor position offset and compensation time coefficients can also be precisely calculated. Parameter sensitivity analysis is carried out, and compensation criteria are also provided to improve the compensation accuracy. Experimental results on a 300 kW PMSM drive system demonstrate that compared to the results achieved with conventional methods, the compensation accuracies of the phase angles used for the current and voltage coordinate transformations are increased by 6°a nd 3.1° at 5000 r/min, respectively. Consequently, the control performance and stability margin of the system are efficiently improved.

A novel filtering algorithm for the resolver position signal based on recursive least squares and phase‐locked loop

“…In the experimental study, the control strategy and parameters of the PMSM drive system are designed based on the study results in literature [29,33]. The performance of three position filtering algorithms is evaluated, that is, conventional LUT, advanced type-III ATO [15], and the proposed RLS-PLL-based algorithm.…”

“…In summary, the position error caused by non‐idealities in resolvers mainly contains the DC offset error and the first, second, third and other high‐order harmonics. The DC offset error caused by the non‐orthogonality in resolvers can be compensated by using the regulation method proposed in [29]. This paper mainly studies the elimination method of harmonic components not lower than the first order.…”

Harmonic error observation of permanent magnet synchronous motor and its angle lag compensation method

“…The advantage of this method is that the rotor position offset and the compensation time coefficient can be accurately calculated even if the system delay cannot determine the specific time. 18 Yuan and Wang proposed a kind of direct torque control (DTC) control method, based on composite active vector modulation (CVM), for PMSM. This PMSM control method makes the torque error and flux linkage error fully compensated in the whole control cycle.…”

Neural Adaptive Funnel Dynamic Surface Control with Disturbance-Observer for the PMSM with Time Delays

“…To circumvent this obstacle, a first-order filter combined with the backstepping control approach [ 5 ] is created by Swaroop, called dynamic surface control [ 6 ]. Despite dynamic surface control methods [ 7 , 8 , 9 ], that can reduce computing efforts, various nonlinear factors such as time delays, external disturbances, and physical constraints are ubiquitous in real industrial scenarios [ 10 , 11 ], which may diminish the controlling precision of the PMSM systems. Researchers have proposed proportional integral derivative (PID) control [ 12 ], neural network (NN) [ 5 ], time delay control [ 13 , 14 ], disturbance observer (DO) [ 15 , 16 ], and constraint control [ 17 , 18 ] methods for different nonlinearities to reach satisfying control results.…”