Voltage difference envelope line-based harbor ship shore power connection system and method

Abstract

The invention discloses a voltage difference envelope line-based harbor ship shore power connection system. The system comprises a shore power transformer, a first switch, a voltage difference envelope line detection apparatus and a control assembly; the shore power transformer is connected to ship power through the first switch; the voltage difference envelope line detection apparatus is connected with the first switch in parallel and converts an obtained voltage difference envelope line signal between shore power and ship power into a periodical positive pulsation signal to transmit to the control assembly; the control assembly takes the lowest point of the periodical positive pulsation signal as a datum point, T time is taken before and after the datum point separately, and the 2T timeis set to be a butt joint time frame; a switch-on signal is transmitted to the first switch within the butt joint time frame to control the first switch to be switched on; and shore power is connectedthrough the shore power transformer, so that seamless butt joint between shore power and ship power is realized, thereby ensuring normal operation of the equipment. Meanwhile, the invention also discloses a voltage difference envelope line-based harbor ship shore power connection method.

Description

technical field [0001] The invention relates to the technical field of ship power consumption, in particular to a system and method for connecting a port ship to shore power based on a voltage difference envelope. Background technique [0002] Ship shore power technology means that the ship connects to the power grid at the dock side during the berth, and obtains the power required for its water pumps, communications, ventilation, lighting and other facilities from the shore power supply, thereby turning off its own diesel generator. After the ship is connected to the shore power, it can effectively reduce the emission of exhaust gas. It has the remarkable advantages of energy saving and environmental protection. It can reduce the noise pollution generated by the operation of the generator set and reduce the cost. Therefore, the government and its transportation departments, shipping companies, and port companies are vigorously promoting shore power. usage of. [0003] Howe...

AI Technical Summary

Problems solved by technology

[0003] However, the existing ship shore power connection technology usually adopts the method of stopping the ship power first and then connecting the shore power and first disconnecting the shore power and then starting the marine generator. Many equipment on the ship will take a long time and trouble to reset after power failure, causing many ships to be reluctant to connect to the shore. Electricity

Although there are some methods of continuous power connection to shore power in the existing technology, such as the use of high-voltage frequency conversion shore power technology, this method has a large investment cost and is only applicable to special ships and special wharves

In addition, when continuous power is connected to shore power, it is necessary to perform short-term parallel operation of the two power systems when the characteristics of the ship's power, phase, and frequency are less different from the shore power, so as to perform load transfer operations. The voltage of the ship's power is It is rather confusing. If the electrical characteristics of shore power and ship power are too different, the circulation generated when ship power is connected to shore power is likely to cause damage to shore power transformer equipment, ship generators, and ship equipment, affecting shore power, Normal operation of ship generators and ship equipment

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