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Motor control method for predicting voltage vector sequence

A technology of voltage vector and motor control, which is applied in the fields of power electronic control, permanent magnet synchronous motor control, motor speed regulation, and motor control. The effect of reducing the number of sorting, improving computing efficiency, and reducing motor loss

Active Publication Date: 2018-11-30
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when the voltage vectors are applied in different orders, the motor's stator flux vector, electromagnetic torque and other state quantities will run on different trajectories, that is, different flux linkage and torque fluctuations will be generated.
The multi-vector predictive torque control currently applied in the permanent magnet synchronous motor system aims at the optimal control performance of the motor at the end of each control cycle, that is, to ensure that the running trajectory of the stator flux vector, electromagnetic torque and other state quantities are in each cycle. It is sufficient to meet the control requirements at the end of a control cycle, and does not consider the influence of the electromagnetic torque and stator flux fluctuations when the applied voltage vectors are arranged in different orders

Method used

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  • Motor control method for predicting voltage vector sequence
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  • Motor control method for predicting voltage vector sequence

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A motor control method for predicting voltage vector sequences, seefigure 1 , the method includes the following steps:

[0049] 101: Through quantitative analysis of the influence of all voltage vector sorting in the two-level voltage source inverter on the fluctuation of the stator flux vector, all voltage vector sorts that are conducive to optimizing the control performance of the stator flux vector are screened out;

[0050] 102: Incorporate all voltage vector sorting into the control set of predictive control, and establish a new voltage vector sequence control set; use the effective value of the fluctuation amount of the stator flux vector in one control cycle as the evaluation index;

[0051] 103: Evaluate the stator flux vector error at each voltage vector switching moment in each control cycle, and construct an evaluation function;

[0052] 104: Calculate the action time of each basic voltage vector through the two-step method of first confirming the phase angle...

Embodiment 2

[0055] Combine below Figure 2-Figure 7 1. The specific calculation formula further introduces the scheme in Embodiment 1, see the following description for details:

[0056] 1. Establish the mathematical model of permanent magnet synchronous motor:

[0057] exist figure 2 In the two-level voltage source inverter, the switching states of the upper and lower arm IGBTs are complementary, so the S A , S B and S C Respectively represent the switching states of the upper and lower arm IGBTs of the three-phase (A, B, and C) level voltage source inverter, and "1" indicates that the upper arm IGBT is in the on state and the lower arm IGBT is in the off state , "0" indicates that the upper bridge arm IGBT is in the off state, and the lower bridge arm IGBT is in the on state.

[0058] There are 8 switch combinations in the level voltage source inverter, and the output phase voltages corresponding to these 8 switch combinations are converted into space vector form, and 6 effective ...

Embodiment 3

[0149] Combined with the specific experimental data, Figure 8-Figure 10 , and the simulation waveforms are used to verify the feasibility of the schemes in Examples 1 and 2, see the following description for details:

[0150] The embodiment of the present invention is verified experimentally in a 6.0kW permanent magnet synchronous motor system. The motor parameters are shown in Table 3. In the experimental test platform, the digital signal processor (DSP) TMS320F28335 implements the algorithm, and the load is provided by an induction motor of 11.2kW, and the induction motor is controlled by S120 produced by Siemens.

[0151] table 3

[0152]

[0153] 1. Transient performance verification

[0154] Figure 8 The experimental waveform of the transient performance of the algorithm proposed by the example of the present invention is given. During the experiment, the motor speed was 100r / min, and the load was 50Nm. Then, the given speed of the motor suddenly changed to 200r...

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Abstract

The invention discloses a motor control method for predicting a voltage vector sequence. The motor control method comprises the following steps that by quantitatively analyzing the influence of all voltage vector sequences in a two-level voltage source inverter on fluctuation of a stator flux vector, and 12 kinds of voltage vector sequences favorable for optimizing the control performance of the stator flux vector are screened out; the 12 kinds of voltage vector sequences are incorporated into a control set of predictive control, and a novel voltage vector sequence control set is established;the effective value of fluctuation quantity of the stator flux vector in one control cycle is taken as an evaluation index; the stator flux vector error at each voltage vector switching moment in eachcontrol cycle is evaluated, and an evaluation function is constructed; and the action time of each basic voltage vector is obtained by a two-step method of first confirming a phase angle and then confirming the amplitude. The motor control method reduces torque fluctuation and flux linkage fluctuation of a permanent magnet synchronous motor, so that the motor can operate more smoothly.

Description

technical field [0001] The invention relates to the field of permanent magnet synchronous motor control, in particular to a permanent magnet synchronous motor system suitable for feeding power from a two-level voltage source inverter, and in particular to taking into account the operating performance of the motor in the case of predictive torque control field of motor control. The invention can be applied to the fields of motor speed regulation, power electronic control and the like. Background technique [0002] Permanent magnet synchronous motors are widely used in elevator traction, CNC machine tools, railway traction systems and other fields due to their advantages such as simple structure, high power density, and wide speed range. The finite control set predictive torque control has the advantages of flexible implementation, easy implementation in multivariable systems, and fast dynamic response. With the continuous development of microprocessor technology, finite con...

Claims

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Application Information

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IPC IPC(8): H02P6/10H02P27/12
CPCH02P6/10H02P27/12H02P2207/05
Inventor 夏长亮李晨周湛清阎彦史婷娜
Owner TIANJIN UNIV
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