表贴式PMSM预测转矩控制的无权重代价函数设计方法研究

doi:10.19595/j.cnki.1000-6753.tces.220952

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Abstract With the advantages of high efficiency, high power density and reliable operation, permanent magnet synchronous motors are widely used in electric vehicles, wind power generation and high performance servo. The research of PMSM high performance control technology is the necessary way to improve the performance of PMSM system. Compared with the two traditional control strategies of field oriented control (FOC) and direct torque control (DTC), model predictive control (MPC) has the advantages of fast dynamic response, flexible objective function configuration, and easy to handle nonlinear constraints. MPC can be divided into model predictive current control (MPCC) and model predictive torque control (MPTC), which can achieve direct control of torque and magnetic chain by introducing torque and magnetic chain into the objective function. However, MPTC adds a weighting factor to the magnetic chain term in the cost function to regulate the degree of influence of Flux linkage term on the value of the cost function, and different weighting factors have a great impact on the control performance of the motor. The currently proposed methods based on fuzzy, particle swarm and cascade sorting all suffer from the problems of high computational power and complex implementation process. To solve this problem, A conversion method based on the cost function of the torque chain is proposed, which unifies the magnitudes of the two, and carries out simulation and experimental verification.
Firstly, the discrete current equation, torque equation and flux linkage equation of PMSM are derived. After the torque equation is substituted into the current equation and the inverse Park transformation is performed on it, the torque cost function is converted into a distance expression from the end point of the voltage vector to a moving line. Similarly, the cost function of the flux linkage is converted into the expression of the distance from the end point of the voltage vector to a moving circle, so the cost function composed of torque and flux linkage is replaced by the distance cost function, which avoids the weighting coefficient design due to the non-uniformity of dimensions. Finally, the design method of PI controller of outer speed loop is presented.
Finally, both simulation and experiment are carried out the compare the steady and dynamic performances of the three methods, namely NWF-PTC proposed in this paper, traditional predictive torque control (CPTC) and model predictive flux control (MPFC) proposed in [17]. NWF-PTC can give consideration to the steady state performance of the torque and flux linkage, and achieve the minimum current harmonic distortion without setting the weight coefficient. Under the two dynamic conditions of sudden change of torque or the command value of the speed, the overshoot and adjustment time of NWF-PTC are also slightly lower than those of the other two methods.
The feasibility and correctness of the proposed method can be certified by the simulation and experimental results, and the following two conclusions are formed as
1) The cost function of the torque and flux can be equivalent to the expression of the distance from the end point of the voltage vector to a moving line and a moving circle respectively, so the unification of the dimensions is realized;
2) On the premise of not deteriorating the dynamic performance, the proposed method can give consideration to the steady-state performance of torque and flux, and improve the waveform quality of the stator current.

Key words： Permanent magnet synchronous motor（PMSM） predictive torque control cost function weighting factor

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TM341

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	Miao Yiru
	Song Pengyun
	Lyu Mingcheng
	Liu Xiao
	Huang Shoudao

Cite this article:

Miao Yiru,Song Pengyun,Lyu Mingcheng等. Design of Cost Function without Weighting Factor for Predictive Torque Control of Surface-Mounted Permanent Magnet Synchronous Motor[J]. Transactions of China Electrotechnical Society, 0, (): 27-27.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.220952 OR https://dgjsxb.ces-transaction.com/EN/Y0/V/I/27

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