A Hybrid SVPWM Method for Torque Ripple Optimization of PMSM Powered by Four-Switch Inverter
A technology of torque ripple and inverter, which is applied in the field of fault-tolerant control of permanent magnet synchronous motors, can solve the problems that sector division is affected by motor parameters, sector division is complicated, and PMSM torque ripple suppression cannot be optimized, etc., to achieve Reduce the calculation intensity, simplify the division of sectors, and reduce the effect of PMSM torque ripple
Active Publication Date: 2021-10-15
HEBEI UNIV OF TECH
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The document "Hybrid SpaceVector Modulation Strategy for Torque Ripple Minimization in Three-PhaseFour-Switch Inverter-Fed PMSM Drives." draws on the ideas of the previous two documents, uses the two modulation methods alternately, and proposes a "five-stage" hybrid The SVPWM method reduces PMSM torque ripple, but the sector division of this modulation method is more complicated, and the sector division is affected by the motor parameters. When the motor parameters change, the PMSM torque ripple suppression cannot be optimized.
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[0064] Specific examples of the present invention are given below. The specific embodiments are only used to further describe the present invention in detail, and do not limit the protection scope of the claims of the present application.
[0065] The invention provides a kind of hybrid SVPWM method (abbreviation method) of PMSM torque pulsation optimization of four switches inverter power supply, it is characterized in that the method comprises the following steps:
[0066] The first step is to propose two modulation methods for the three-phase four-switch inverter:
[0067] The voltage vector distribution of the three-phase four-switch inverter in the α-β coordinate system is as follows: figure 1 shown, including V 1 , V 2 , V 3 and V 4 Four voltage vectors, the four voltage vectors have different amplitudes, and they are symmetrical in pairs; at the same time, they do not contain zero vectors, and two voltage vectors in opposite directions need to be used to equivalen...
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The invention discloses a novel hybrid SVPWM method for optimizing torque ripple of a PMSM powered by a four-switch inverter. This method alternately uses two different modulation methods in different sectors, and introduces a new method for deriving the effective value of torque ripple, so that sector division is not affected by motor parameters. At the same time, a novel sector division method is proposed to make sector division easier. This new hybrid SVPWM method improves the original modulation method, which can effectively reduce the calculation intensity of the digital signal processor and has engineering application value; and when the motor parameters change, it can still effectively reduce the PMSM torque ripple.
Description
technical field [0001] The invention relates to the technical field of fault-tolerant control of permanent magnet synchronous motors, in particular to a hybrid SVPWM method for torque ripple optimization of a PMSM powered by a four-switch inverter. Background technique [0002] Permanent magnet synchronous motor (PMSM) has the advantages of high torque inertia and high power factor, and has been widely used in electric vehicles, aerospace and military fields. However, the inverter is the link most prone to failure in the PMSM control system, so the system must have fault-tolerant operation capability. To solve this problem, one method is to adopt an inverter structure with redundant switching devices, and put the redundant devices into operation immediately after the normal operating switching device fails, but this will increase the system cost; another method It is to reconfigure the system into a three-phase four-switch form after a fault. This method has the advantages ...
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IPC IPC(8): H02P21/14H02P21/18H02P21/20H02P21/22H02P25/022H02P6/10H02P27/12
CPCH02P6/10H02P21/14
Inventor 董砚张豪荆锴张现磊刘学奥
Owner HEBEI UNIV OF TECH