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Fault-tolerant control method of permanent-magnet synchronous motor driving system

A technology for permanent magnet synchronous motors and drive systems, which is applied in motor control, motor generator control, electronically commutated motor control, etc., and can solve problems such as the decline in robustness of the control system

Active Publication Date: 2014-06-11
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of the model method is that it depends on more motor parameters, and the robustness of the control system decreases

Method used

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  • Fault-tolerant control method of permanent-magnet synchronous motor driving system
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  • Fault-tolerant control method of permanent-magnet synchronous motor driving system

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Embodiment Construction

[0041] The present invention will be described below with reference to the accompanying drawings.

[0042] The system block diagram of the embodiment of the present invention is as figure 1 As shown, including: rectifier circuit, filter circuit, control system, permanent magnet synchronous motor, position sensor. Among them, the parameters of the permanent magnet synchronous motor are: rated phase voltage U N =220V, number of pole pairs p n =2, stator resistance R s =0.665Ω, direct axis inductance L d =7.623mH, quadrature axis inductance L q =7.623mH, permanent magnet flux linkage ψ f =0.783Wb, rated speed n N =1500r / min; determine the control parameters used in the control process according to the characteristics of the control system, in this embodiment, take the control period T s =50μs, proportional coefficient K p =0.1, integral coefficient K i =1, direct axis current reference value i d_ref = 0, speed reference value ω ref =1000r / min, current controller ring ...

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Abstract

The invention discloses a fault-tolerant control method of a permanent-magnet synchronous motor driving system. Under the normal working conditions of a phase-current sensor, the system adopts a normal current hysteresis control mode. When the phase-current sensor is detected to fail, the system enters a fault-tolerant control mode to perform out-phase check for an original switch signal obtained by the normal current hysteresis control mode, if the original switch signal and a last actual switch signal meet the out-phase principle, then the original switch signal directly serves as the actual switch signal to be outputted, and otherwise, the original switch signal is modified according to a minimum current deviation absolute value method so that the actual switch signal is obtained and outputted. The method has the advantages that a hardware structure of an existing driving system is unchanged, and the method is high in reliability, simple, feasible and the like.

Description

technical field [0001] The invention belongs to the technical field of motor drive and control, and relates to a fault-tolerant control technology of a permanent magnet synchronous motor drive system. Background technique [0002] In order to realize the high-precision and high-dynamic performance operation of the permanent magnet synchronous machine (PMSM), various control methods emerge in an endless stream, among which direct torque control and vector control are the most typical methods. The id=0 control method based on current hysteresis (hereinafter referred to as current hysteresis control) belongs to the category of vector control in essence. Because the current hysteresis control method does not depend on any motor parameters and has a simple structure, it is one of the most widely used PMSM control methods at present. Like the control methods of most PMSMs, the current hysteresis control method requires current sensors to collect three-phase currents. However, on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/00H02P21/16H02P29/028
Inventor 程明王伟张邦富
Owner SOUTHEAST UNIV
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