KR20160130598A

KR20160130598A - Ship electric propulsion system

Info

Publication number: KR20160130598A
Application number: KR1020150062548A
Authority: KR
Inventors: 박제욱; 권순도; 김상준
Original assignee: 대우조선해양 주식회사
Priority date: 2015-05-04
Filing date: 2015-05-04
Publication date: 2016-11-14

Abstract

An electric propulsion ship system according to an embodiment of the present invention includes a generator for supplying electric power generated by producing electric power to a motor, an AC-DC converter connected to a generator, a DC-AC inverter connected to an AC-DC converter, And a power buffer module connected to the AC inverter and connected to the AC-DC converter to monitor the power consumed by the motor and to supply power to the motor.

Description

Electric propulsion ship system {Ship electric propulsion system}

The present invention relates to an electric propulsion ship system, and more particularly, to an electric propulsion ship system including a supercapacitor to quickly respond to a power load.

The power of offshore structures, including ships, drillships, etc., is produced by generators driven by diesel engines, gas turbines or steam turbines, and most of the power is consumed by electric engines or motors for propellers and thrusters. Power station overload, large power fluctuations, or shutdown may occur in an offshore structure if the system causes sudden and fluctuating power consumption in a dynamic positioning (DP) system for station maintenance or operation.

Power overload situations, referred to as black-out, are very dangerous and can cause equipment damage and serious accidents or shipwrecks to the ship. Therefore, it is required to test or monitor the interaction of the DP control system, the power generation system and the power management system or the marine automation system part in order to prevent blackouts, unavoidable power fluctuations, and the like.

On the other hand, in order to improve the ship's power system, the development of technologies using renewable energy, which is alternative energy, has been making research and development of solar-powered vessels around the world. However, the ships being developed are designed as large ships using large-capacity, large-area flat-panel type solar cell modules, and the actual users of these vessels are very limited due to the large maintenance cost and high cost of manufacturing the vessels. In addition, since it is impossible to generate light in shadows and shadows, it is possible to generate solar power only on a clear day. Therefore, there is a problem that the battery must be charged to an external power source by docking the ship for a long time for smooth operation. In addition, when a flat-type solar cell module is used for a small ship, the size of the ship is small, so that the number of modules for the generated power required for the operation of the planar solar cell module can not be installed, .

Korean Registered Patent No. 10-1278179 (Jun. 18, 2013)

The present invention has an object to compensate for a rapidly changing power load in an electric propulsion ship system.

The present invention aims at quickly responding to a rapidly changing load by integrally connecting motors of an electric propulsion ship system to share electric power.

An object of the present invention is to secure a time for a generator to increase its output in an emergency situation of an electric propulsion ship system.

An electric propulsion ship system according to an embodiment of the present invention includes a generator that generates electric power and supplies electric power to the motor, an AC-DC converter connected to the generator, a dc-ac inverter connected to the AC- A motor connected to the dc-ac inverter, and a power buffer module connected to the AC-DC converter to monitor power consumed in the motor and supply power to the motor.

The power buffer module may include a supercapacitor to charge or discharge power in the supercapacitor.

The power buffer module includes a control unit for monitoring an amount of power consumed in the motor, and the control unit can control power supplied from the supercapacitor to the motor according to the monitored amount of power.

The control unit may supply power from the supercapacitor to the motor when the amount of power consumed by the motor is equal to or greater than a reference value.

The power buffer module may include a DC-DC converter and be connected to the AC-DC converter.

A method for operating an electric propulsion vessel system according to an embodiment of the present invention includes monitoring a power consumed in a motor supplied with electric power from a generator, And a control step of controlling power supply to the motor from a discharging supercapacitor.

The control step may supply power from the supercapacitor to the motor when the monitored amount of power in the monitoring step is equal to or greater than a reference value.

The present invention has the effect of compensating for a rapidly changing power load in an electric propulsion ship system.

According to the present invention, motors of an electric propulsion ship system are integrally connected to share electric power, thereby rapidly responding to a rapidly changing load.

The present invention has the effect of securing a time for increasing the output of the generator in an emergency situation of the electric propulsion vessel system.

1 is a circuit diagram schematically showing an electric propulsion ship system according to an embodiment of the present invention.
2 is a circuit diagram schematically showing an electric propulsion ship system according to another embodiment of the present invention.
3 is a flowchart schematically illustrating an operation method of an electric propulsion ship system according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. Prior to the description, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and should be construed in accordance with the technical concept of the present invention.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between. Other expressions that describe the relationship between components, such as "between" and "between" or "neighboring to" and "directly adjacent to" should be interpreted as well.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings.

1 is a circuit diagram of an electric propulsion ship system according to an embodiment of the present invention. Referring to FIG. 1, an electric propulsion ship system according to an embodiment of the present invention includes a generator 110 that supplies electric power produced by generating electric power to a motor, and includes an AC-DC converter 110 connected to the generator 110, AC inverter 130 that includes a DC-AC inverter 130 connected to an AC-DC converter 120 and a power buffer module 130 connected to a DC-AC inverter 130. The DC-

It is preferable that a plurality of generators 110 are disposed. Each of the plurality of generators 110 generates electric power and supplies the produced electric power to the ship. The power generated by the generator 110 is supplied to the AC-DC converter 120 to supply the generated power to the ship.

A plurality of AC-DC converters 120 are arranged and connected to the plurality of generators 110, respectively. The AC-DC converter 120 converts the AC voltage supplied from the generator 110 into a DC voltage.

A plurality of DC-AC inverters 130 are arranged and connected to these AC-DC converters 120, respectively. The DC-AC inverter 130 converts the DC voltage into an AC voltage and supplies it to the motor 150.

At this time, the AC-DC converter 120 is connected to the power buffer module 140. The power buffer module 140 is arranged to share power to immediately respond to load fluctuations of the very fast motor 150. The power buffer module 140 includes a supercapacitor 141 having a very fast charging and discharging characteristic so that the motor 150 receives power from the supercapacitor 140 when a load fluctuation occurs in the motor 150. The AC-DC converter 120 converts the alternating current (AC) voltage generated by the generator 110 into a direct current (DC) voltage. The power buffer module 140 is connected to the AC-DC converter 120 and stores a voltage converted into a direct current (DC) voltage in the supercapacitor 141. [

The supercapacitor 141 is an energy storage device having a much higher capacitance than a capacitor or an electrolyte capacitor with a very high capacity capacitor. Unlike a battery using a chemical reaction, the supercapacitor uses a simple phenomenon of ion transfer to the electrode and electrolyte interface or a charging phenomenon by a surface chemical reaction. Supercapacitors are capable of rapid charging and have high charge / discharge efficiency and semi-permanent cycle life characteristics. The power quality can be ensured by absorbing or discharging the difference between the developed power and the load power with slow load response characteristics.

The power buffer module 140 includes a control unit 141 for monitoring the amount of power consumed in the motor 150. [ The control unit 141 controls the power supplied from the supercapacitor 142 to the motor 150 according to the monitored amount of power. The power buffer module 140 also includes a DC-DC converter 143 and is connected to the AC-DC converter 120.

The DC-DC converter 143 converts the DC voltage to another DC voltage. The DC-DC converter 143 converts the DC voltage into a DC voltage suitable for charging or discharging the supercapacitor 142. The DC stage of each motor 150 and the DC-DC converter 143 are connected to each other.

When the amount of power consumed by the motor 150 is equal to or greater than the reference value, the control unit 141 supplies power from the supercapacitor 142 to the motor 150. When the amount of power consumed by the motor 150 is less than the reference value, the control unit 141 receives the power supplied from the generator 110 to the motor 150 and stores the power in the received supercapacitor 142.

The power buffer module 140 minimizes variations in the load factor of the main AC system so as to provide stable power supply. The electric propulsion ship system of the present invention including the super capacitor 142 can secure a change time according to the output of the main AC system. In addition, the main AC system composed of the generator 110 and the auxiliary DC system composed of the supercapacitor 142 can be operated in parallel.

2 is a circuit diagram schematically showing an electric propulsion ship system according to another embodiment of the present invention. Referring to FIG. 2, an AC-DC converter 144 is included in the power buffer module 140 of the electric propulsion ship system according to another embodiment of the present invention. The power buffer module 140 of FIG. 2 may directly connect the supercapacitor 142 and the AC-DC converter 144 to eliminate unnecessary redundancy.

The motors 150 connected to the failed generators 111 and 112 may be connected to the generators 113 and 114 not connected to the generators 113 and 114 or the supercapacitors 142 As shown in Fig. The control unit 141 causes the generators 113 and 114 and the AC-DC converter 144 to be connected to each other so that the electric power generated by the generators 113 and 114 is transmitted to the respective motors 150.

3 is a flowchart schematically showing a method of operating an electric propulsion ship system according to an embodiment of the present invention. Referring to FIG. 3, a method for operating an electric propulsion vessel system according to an embodiment of the present invention includes a monitoring step S210 for monitoring power consumed in a motor supplied with power from a generator, and a monitoring step S210, And controlling the power supply from the supercapacitor 142, which is included in the power buffer module 140 to charge and discharge electric power, to the motor 150 according to the control signal S220. At this time, the control step S220 supplies power from the supercapacitor 142 to the motor 150 when the monitored amount of power in the monitoring step S210 is equal to or greater than the reference value.

Thus, those skilled in the art will appreciate that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive.

110, 111, 112, 113, 114: generator
120: AC-DC converter
130: AC-DC inverter
140: Power buffer module
141:
142: supercapacitor
143: DC-DC converter
144: AC-DC converter
150: motor

Claims

A generator for generating electric power and supplying electric power to the motor;
An AC-DC converter connected to the generator;
A DC-AC inverter connected to the AC-DC converter;
A motor connected to the DC-AC inverter; And
A power buffer module connected to the AC-DC converter to monitor power consumed by the motor and supply power to the motor;
Wherein the electric propulsion vessel system comprises:

The method according to claim 1,
The power buffer module includes:
Wherein the supercapacitor includes a supercapacitor to charge or discharge power in the supercapacitor.

3. The method of claim 2,
The power buffer module includes:
And a controller for monitoring an amount of power consumed by the motor, wherein the controller controls power supplied from the supercapacitor to the motor in accordance with the monitored amount of power.

The method of claim 3,
Wherein,
And supplies power from the supercapacitor to the motor when the amount of power consumed by the motor is equal to or greater than a reference value.

The method according to claim 1,
The power buffer module includes:
DC converter including a DC-DC converter and is connected to the AC-DC converter.

A monitoring step of monitoring power consumed in a motor supplied with power from the generator;
A control step of controlling power supply to the motor from a supercapacitor that is included in the power buffer module and charges and discharges power according to the amount of power monitored in the monitoring step;
Wherein said method comprises the steps of:

The method according to claim 6,
Wherein the control step comprises:
Wherein power is supplied from the supercapacitor to the motor when the monitored amount of power is greater than or equal to a reference value.