Phase-controlled rectification switch control method and device

Abstract

In the phase-controlled rectification switch control method, in the capture interruption step, if it is judged that the last switch control step of the previous cycle has not been executed, step A is not executed. The capture time of the latest synchronous signal is taken as the action reference, and each cycle In the last switch control step of , if it is judged that step A will not be executed in the capture interruption step of the next cycle, step K2 will not be executed before the execution time is set for the next switch control step in step K3. . Pre-update the action base, and perform step A instead. The steps in the method can establish functional modules and combine them into a functional module framework, which is mainly realized by computer programs stored in computer-readable storage media. In the functional module architecture, only one switch control function module can be run to realize all the switch control steps, which consumes less resources and can avoid missing execution of the switch control steps caused by updating the action reference.

Description

technical field [0001] The invention relates to a phase-controlled rectification switch control method. The steps in the method can establish functional modules and combine them into a functional module framework, which is mainly realized by computer programs stored in computer-readable storage media. Background technique [0002] Phase-controlled rectification refers to periodically turning on and off the switches in each bridge arm of the rectifier bridge, and controlling the DC voltage output by the rectifier bridge by controlling the phase of the on / off action of the switch in each bridge arm. Taking the three-phase bridge full phase-controlled rectification, that is, the six-pulse phase-controlled rectification as an example, the upper and lower thyristors connected to the A-phase power supply are respectively SCR1 and SCR4, and the upper and lower thyristors connected to the B-phase power supply are respectively SCR3 , SCR6, the upper and lower thyristors connected to ...

AI Technical Summary

Problems solved by technology

[0014] 2. However, in the case of rectifier soft start, for example, it is possible that the six switching controls in one cycle have not all ended before the synchronization signal of the next cycle has been captured, so the sequence of events may become:

[0021] It can be seen that if the synchronization signal is captured before the switch control step five is executed, and the action reference is updated, the switch control step five will mistakenly use the updated action reference to calculate the execution time of the switch control step six, which is equivalent to The action reference of the next cycle is used to calculate the execution time of the switch control step 6, which causes the switch control step 6 to be executed at the time corresponding to the action reference of the next cycle + 300 degrees + the action angle, instead of the action reference of the current cycle + Execute at the time corresponding to 300 degrees + action angle, resulting in the switch control step 6 not being able to be executed within this period

[0022] In order to avoid the missing execution of the switch control steps caused by updating the action reference, the traditional method is to establish the first switch control function module for the switch control steps 1, 2, and 3, and establish the second switch control function module for the switch control steps 4, 5, and 6. Module, the two switch control function modules use different registers to store the action benchmarks, the action benchmarks used in the switch control steps 1, 2, and 3 are updated in the capture interrupt step, and the execution time of the switch control step 1 is set in the capture interrupt , while the action benchmarks used in the switch control steps 4, 5, and 6 are updated in the switch control step 3. The disadvantage of this method is that two different switch control function modules need to be run, which consumes more resources