Phase difference detection method for grid-connected marine generator set

Abstract

The invention discloses a ship generator set grid-connected phase difference detection method. The ship generator set grid-connected phase difference detection method comprises the steps of respectively transmitting an exclusive-or square signal to two detection channels of the same timer, wherein one detection channel performs rising edge detection on the exclusive-or square signal to record a rising edge detection moment, and the other detection channel performs falling edge detection on the exclusive-or square signal and records a falling edge detection moment; using the falling edge detection moment to subtract the rising edge detection moment to obtain a calculation result; confirming the grid-connected phase difference if the calculation result is larger than 0, performing complementing calculation on the calculation result according to an exclusive-or wave formation principle and confirming that a calculated value is a grid-connected phase difference value if the calculation result is smaller than 0. By adopting the method, high measurement and processing accuracy can be achieved, the practical demand can be met, and meanwhile the method further has good adaptability and online parameter adjusting capacity which a hardware device does not have.

Description

technical field [0001] The invention belongs to the technical field of power supply of marine generator sets, and in particular relates to a detection method for grid-connected phase difference of marine generator sets. Background technique [0002] The ship power station provides power for various types of ship-borne electrical equipment. It usually consists of more than one generator set. The specific number of units is determined by factors such as the ship's power consumption, power supply reliability requirements, and power supply efficiency requirements. During the operation of the ship, with the increase of power demand and the needs of sailing conditions, it is often necessary for multiple generator sets in the power station to supply power to the grid at the same time. Reliable parallel operation. [0003] When the generator set is connected to the live grid, the frequency, voltage and phase must be consistent with the grid (busbar). Theoretically, the difference i...

AI Technical Summary

Problems solved by technology

However, the phase difference is difficult to detect and calculate in real time due to many influencing factors, periodic changes and high detection frequency requirements.

[0004] The phase difference condition judgment of the traditional marine generator set synchronous grid connection process is realized by hardware. This method is fast and accurate, but has the disadvantages of poor adaptability and difficult adjustment.

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