A kind of electric ship charger multi-machine parallel constant voltage current sharing control method and device

Abstract

The invention discloses a multi-computer parallel constant voltage and current sharing control method for electric ship chargers, which comprises the following steps: obtaining the output voltage and output current of several chargers in the current sampling period and the real-time voltage of the electric ship energy storage components; Calculate the control coefficient of the charger according to the output voltage, output current and real-time voltage of the energy storage component of any charger in the current sampling period; get the output voltage command value of the charger according to the control coefficient, and control the charger according to the output voltage The command value outputs the charging voltage. Also disclosed is a multi-unit parallel constant voltage and current sharing control device for electric ship chargers. By detecting the output voltage and current of several chargers and the battery voltage of the energy storage component of the electric ship, the control coefficient of each charger is obtained, and then the output voltage command value of the charger is adjusted to make the output current of several chargers It tends to the average charging current, avoiding the circulating current and uneven current among several chargers.

Description

technical field [0001] The invention relates to the technical field of electric ship chargers, in particular to a multi-machine parallel constant voltage and current sharing control method and device for an electric ship charger. Background technique [0002] As of the end of 2019, my country had a total of 131,700 transport ships with a total tonnage of 248 million tons. After deducting ocean-going transport ships and cross-sea transport ships, the number of ships focusing on inland lakes and inland rivers was 128,000, with a total tonnage of 210 million tons. undertake heavy transportation tasks. These ships mainly use diesel engines as their power source, so inland ships have also become large energy consumers and important sources of pollution in various places. In order to alleviate the environmental pressure on the developed coastal areas, the Yangtze River Delta water system and the main stream of the Yangtze River, the state has vigorously promoted the electrificatio...

AI Technical Summary

Problems solved by technology

Since the battery capacity of the electric ship is MWh level, the charging power required is large, and multiple chargers can be charged in parallel. However, when multiple chargers are connected in parallel for constant voltage charging, there will be problems of uneven current or even circulating current, which is not conducive to control. charging current, and increase system loss

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