Synchronous modulation phase compensation method, medium and electronic equipment

Abstract

The invention discloses a synchronous modulation phase compensation method, a medium and electronic equipment, and the method comprises the steps: calculating an actual wave-transmitting phase of a wave-transmitting phase voltage based on a motor rotor position, a motor d-axis voltage and a motor q-axis voltage; obtaining an expected phase of a first current sampling point of the current period based on the carrier wave ratio; obtaining the phase deviation between the actual wave sending phase and the expected phase of the first current sampling point; on the basis of the phase deviation and a PI control algorithm, obtaining adjusting switching frequency; and obtaining a final switching frequency based on the adjusted switching frequency. Through the phase deviation between the expected phase and the actual phase of the first current sampling point and the PI control algorithm, the adjusting switching frequency is obtained, the final switching frequency (carrier frequency) is further obtained, the carrier frequency is dynamically adjusted, the output harmonic component is reduced, the current loop control phase constant calculation is achieved, and the phase of the current sampling point is further adjusted. Current sampling phases are fixed, and upper and lower half shafts of three-phase current are controlled to be symmetrical.

Description

technical field [0001] The invention belongs to the technical field of automobile control, and more specifically relates to a synchronous modulation phase compensation method, medium and equipment. Background technique [0002] In the current motor controller algorithm, synchronous modulation is realized through segmental frequency conversion, which only ensures that the number of sampling points in a current cycle is fixed, but it cannot guarantee that the current sampling phase is fixed, and the phase of the output voltage waveform changes, making it difficult to guarantee three-phase output. The symmetry of the motor causes the motor to work unsteadily, and the harmonics of the current output also increase, which brings about the problem of increased harmonic loss. In high-power applications, if the switching frequency is too high, the switching loss will increase. Using asynchronous modulation will result in a large number of high-amplitude low-order harmonics. Therefore...

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Problems solved by technology

[0009]The existing segmented frequency conversion control method only realizes that the carrier ratio N in the current cycle in a certain frequency band is constant, but it does not guarantee the current sampling phase Fixed, when the motor speed is increasing / decreasing, the ideal synchronous debugging control effect is as follows Figure 1, the first sampling point of the cycle is at 30 degrees (30°, 60°...360° in sequence), and the first point of actual current sampling is moved to point A Or at point B, the current control phase will change. Different current frequency cycles, the control current phase is not a fixed point, which will lead to the asymmetry of the upper and lower semi-axis of the current waveform of the controller, the increase of the output harmonic component, and the increase of harmonic damage. , the efficiency decreases

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