Multiprocessor PWM carrier synchronization method

Abstract

The invention discloses a multiprocessor PWM carrier synchronization method, and belongs to the field of power electronic converter control. According to the synchronization method, a master processorand a plurality of slave processors are adopted, wherein the master processor is provided with a PWM unit and a carrier synchronization signal generation unit, and the carrier synchronization signalgeneration unit generates a synchronization signal with the same phase as the PWM unit; the plurality of slave processors have the same structure and are provided with carrier synchronization signal phase-locked loop units and PWM units, and the carrier synchronization signal phase-locked loop units track synchronization signals of PWM carriers of the master processor in real time through the PWMunits so as to achieve accurate synchronization of the PWM carriers of the master processor and the PWM carriers of the slave processors. The PWM quasi-synchronization method has the advantages that the PWM quasi-synchronization method is suitable for a PWM carrier synchronization method of multiple processors, does not depend on a hardware synchronization unit, and can achieve PWM wave precise synchronization of the multiple processors without the hardware synchronization unit; the method is not influenced by interrupt response time of various processors, accurate synchronization of PWM wavesof the main processor is achieved, and the performance and stability of parallel operation control of the multi-grid-connected converter are improved.

Description

Technical field [0001] The invention relates to the field of power electronic converter control, in particular to a multi-processor PWM carrier synchronization method. Background technique [0002] Grid-connected converters have a wide range of applications in the field of new energy due to their flexible and advanced grid-connected control functions. They are key equipment for large-scale new energy generation and energy storage and absorption systems. With the rapid development of large-scale new energy technologies around the world, higher requirements have been put forward for the high-power transmission capacity of grid-connected converters. Connecting multiple grid-connected converters in parallel to the grid is to achieve large-scale new energy generation and An effective way to store energy. [0003] The current operation modes of multi-parallel grid-connected converters can be roughly divided into two types: direct parallel-connected converters and isolated parallel-conne...

AI Technical Summary

Problems solved by technology

The document "A Parallel System of Off-grid Inverters and Its High-frequency Carrier Synchronization Method" describes a grid voltage phase-locked loop technology to realize PWM synchronization to reduce circulating currents, but because the grid voltage fluctuates in the actual process, It will cause an error in the angle of the phase-locked loop, and the complete synchronization of the PWM cannot be achieved.

There are also literatures that use various serial buses such as RS485 bus or CAN bus to realize PWM synchronization to reduce the circulation problem. Introduces a large error, making it difficult to achieve precise synchronization

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