Dual three-phase permanent magnet synchronous motor current harmonic minimum pulse width modulation method and system
A dual-phase permanent magnet, synchronous motor technology, applied in the control system, motor control, vector control system and other directions, can solve the problem of less dual-phase motor, achieve the suppression of stator current harmonics, reduce the total harmonic distortion rate , the effect of improving system performance
Active Publication Date: 2021-06-11
长沙牛米驱动科技有限公司
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Problems solved by technology
At present, there are many studies on three-phase motors at low carrier ratios, but there are few control methods or modulation strategies for dual three-phase motors to suppress current harmonics at low switching frequencies
Method used
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[0038] figure 1 It is a schematic diagram of the drive system structure of the existing dual-three-phase permanent magnet synchronous motor, assuming that the dual-three-phase windings are symmetrically distributed in space, and the air-gap magnetic potential is sinusoidally distributed in space, ignoring magnetic circuit saturation and core loss, eddy current and Hysteresis loss is negligible. Then the voltage equation of the dual three-phase permanent magnet synchronous motor can be expressed as:
[0039]
[0040]
[0041]
[0042] In the above formula, is the stator voltage vector, R is the stator resistance, is the stator current vector, is the stator flux vector, ψ d1 ,ψ q1 ,ψ d2 and ψ q2 is the flux linkage in the double dq coordinate system of the double three-phase permanent magnet synchronous motor, i d1 ,i q1 ,i d2 and i q2 Respectively, the current in the double dq coordinate system, L dq is the inductance matrix, ψ f is the rotor permanent ...
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The invention discloses a dual three-phase permanent magnet synchronous motor current harmonic minimum pulse width modulation method and system. The method comprises the following steps: calculating an instruction voltage, and calculating an instruction voltage angle and a modulation ratio m according to the instruction voltage and a DC bus voltage Udc; carrying out load angle calculation according to the rotor position angle theta r and the instruction voltage angle to obtain an instruction load angle delta*; and obtaining a corresponding optimal switching angle P (delta*, m, N) from a preset lookup table according to the load angle delta*, the modulation ratio m and the switching angle times N, and generating a six-phase pulse according to the optimal switching angle P (delta *, m, N) of the voltage angle and the frequency f to control the dual three-phase permanent magnet synchronous motor. The stator current harmonic waves under the low-carrier-ratio working condition can be suppressed, the total harmonic distortion (THD) rate of the stator current is reduced, and the system performance is improved.
Description
technical field [0001] The invention relates to the control technology of a double-three-phase permanent magnet synchronous motor, in particular to a method and system for modulating the minimum pulse width of the current harmonic of a double-three-phase permanent magnet synchronous motor. Background technique [0002] Double three-phase permanent magnet synchronous motor has the advantages of small torque ripple, good fault tolerance and high power density, and is widely used in electric vehicles, ship propulsion, high-power locomotive traction and other fields. However, due to the limitation of switching loss and cooling conditions, the switching frequency of the converter is limited within a few hundred hertz in the high-power traction system. Low switching frequency will increase the low-order harmonic content of the output voltage of the inverter, causing load current distortion, current peak value increase, torque ripple and other problems, which have a great impact on...
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IPC IPC(8): H02P29/50H02P21/00H02P25/022H02P25/22
CPCH02P29/50H02P21/0003H02P25/022H02P25/22H02P2207/05Y02T10/72
Inventor 梁戈黄守道廖武黄晟李梦迪罗德荣刘钰冯聪琪
Owner 长沙牛米驱动科技有限公司