Direct axis current protection method and device for PMSM (permanent magnet synchronous motor) transmission system
A technology of permanent magnet synchronous motor and direct axis current, which is applied in the direction of emergency protection circuit device, emergency protection circuit device, circuit device, etc. for limiting overcurrent/overvoltage, and can solve system failure and reactive component of PMSM transmission system Large, large loss and other issues
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Embodiment 1
[0103] see image 3 , which is a flow chart of Embodiment 1 of the direct axis current protection method of the permanent magnet synchronous motor drive system provided by the present invention.
[0104] It is understandable that if the hardware acquisition signal is lost (jump phenomenon of current information and position information) or the external working conditions are out of control, the voltage output from the inverter to the motor terminal will be large, resulting in an uncontrollable direct-axis motor. Current information, if the direct-axis current exceeds the limit of the maximum protection value, it will directly cause the system overcurrent to overturn or even cause the permanent magnet to lose its magnetism. Therefore, in the implementation of the present invention, not only the current given value of the direct-axis current is limited, but also the The actual direct axis current produced by the PMSM is predicted and protected.
[0105] The direct axis current ...
Embodiment 2
[0117] The specific implementation process of the method provided by the present invention will be described in detail below in conjunction with specific embodiments.
[0118] see Figure 4 , which is a flow chart of Embodiment 2 of the direct axis current protection method of the permanent magnet synchronous motor drive system provided by the present invention.
[0119] It should be noted that S401 and S301 are the same;
[0120] S401: Estimate the direct-axis current i at the next moment from the current voltage sent to the PMSM terminal of the permanent magnet synchronous motor d (K+1);
[0121] i d ( K + 1 ) = u d ( K ) ( R s + ...
Embodiment 3
[0137] see Figure 5 , which is a schematic diagram of a direct-axis current PI regulator added with an anti-integral saturation part provided by the present invention.
[0138] In this embodiment, when the direct axis current is greater than the maximum protection current at the next moment, the direct axis current is introduced into the direct axis current PI regulator as an anti-integral saturation value to automatically adjust the system and restore the state before the protection occurs.
[0139] The formula of the existing direct-axis current PI regulator is as follows:
[0140] u d _ pi _ Out = ( K p + K i 1 s ) ( i d ...
PUM
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