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Expansion control set-based forecast flux linkage control method of permanent-magnet synchronous motor

A permanent magnet synchronous motor and extended control technology, which is applied in the direction of controlling generators, controlling electromechanical brakes, controlling electromechanical transmissions, etc., can solve problems such as difficulty in fixing weight coefficients, large torque fluctuations, sector misjudgments, etc., and achieve good results. Effects of control performance, suppression of steady-state fluctuations, and expansion of control degrees of freedom

Active Publication Date: 2019-11-12
萤火科技发展(天津)有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to realize the simultaneous adjustment of torque and flux linkage, in the case of different dimensions of torque and flux linkage, it is necessary to carefully design the weight coefficient in the cost function. The selection of this coefficient requires a large amount of experimental data as support
In addition, due to the variation of rotor speed and load torque, the fixed weight coefficients determined under off-line conditions are difficult to apply under different working conditions
Especially the speed step change or the load torque change will lead to misjudgment of the sector, and then produce a large torque fluctuation

Method used

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  • Expansion control set-based forecast flux linkage control method of permanent-magnet synchronous motor
  • Expansion control set-based forecast flux linkage control method of permanent-magnet synchronous motor
  • Expansion control set-based forecast flux linkage control method of permanent-magnet synchronous motor

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Embodiment 1

[0052] The embodiment of the present invention adopts the stator flux vector as the control variable, which can avoid the sector misjudgment problem in the traditional extended control set model predictive torque control strategy, and also avoids the process of weight coefficient adjustment; in the construction of the cost function In the process, the influence of different control sets on the flux linkage trajectory in the whole sampling period is considered, and the average stator flux fluctuation is calculated by the integral method, which can further suppress the steady-state fluctuation of torque and stator flux; through the optimal stator voltage vector The cascaded synthesis process can directly obtain the duty cycle signal without the need of the space vector pulse width modulation process. Embodiments of the present invention are described through the following parts:

[0053] 101: Mathematical modeling of the controlled object, namely the permanent magnet synchronous...

Embodiment 2

[0059] The scheme in Embodiment 1 is further introduced below in conjunction with specific calculation formulas, examples, and accompanying drawings, see the following description for details:

[0060] 1. Modeling of permanent magnet synchronous motor

[0061] The mathematical model of the permanent magnet synchronous motor is established under the two-phase static coordinate system. The embodiment of the present invention uses vectors to represent variables, and the vector variables are bolded. For example: the stator flux vector can be expressed as ψ s = ψ sα +jψ sβ , where ψ sα is the α-axis stator flux vector component, ψ sβ is the flux vector component of the β-axis stator. The stator voltage equation and flux linkage equation can be expressed as:

[0062]

[0063] In the formula, R s and L s Represents stator resistance and inductance; V s and i s Indicates the stator voltage vector and current vector; ψ s and ψ r Represent the stator flux vector and the pe...

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Abstract

The invention discloses an expansion control set-based forecast flux linkage control method of a permanent-magnet synchronous motor. The expansion control set-based forecast flux linkage control method comprises the steps of performing mathematical modeling on the permanent-magnet synchronous motor; acquiring a virtual voltage vector of a terminal point arranged on a boundary of a space voltage vector hexagonal plane with regard to a stator voltage vector in a mathematical model, wherein the virtual voltage vector and a basic voltage vector form an expansion control set; acquiring an expansioncontrol set-based forecast flux linkage control model, employing a stator flux linkage vector as a control variable, and building a cost function according to influence of different control sets on stator flux linkage track within a sampling period, wherein an average value of the stator flux linkage reference track and actual track error which are calculated within the sampling period by an integral method is quantized by the cost function; determining optimal sector by cost function optimal dissolving, seeking optimal expansion voltage vector in the optimal sector, and performing amplitudeoptimization on the optimal expansion voltage vector.

Description

technical field [0001] The invention relates to the field of motor systems and controls, in particular to a method for predicting flux linkage control of permanent magnet synchronous motors based on extended control sets. Background technique [0002] Permanent magnet synchronous motors (PMSMs) have attracted extensive attention in motion control systems due to their high power density, high energy efficiency, compact structure, and high torque-to-current ratio. Its control algorithms have been extensively studied in the past decades. Since its first application in the field of power electronics and motor drives more than two decades ago, model predictive control strategies are still popular today. Due to its remarkable advantages such as simple implementation, fast dynamic response, and high flexibility in combining multiple control objectives with various constraints, model predictive control, especially its finite set predictive control branch, has been proved to be a ra...

Claims

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Application Information

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IPC IPC(8): H02P21/05H02P21/14H02P6/34H02P25/022
CPCH02P6/34H02P21/05H02P21/14H02P25/022
Inventor 宋战锋王亚琦
Owner 萤火科技发展(天津)有限责任公司
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