KR101880986B1 - Dc distribution board with power management module - Google Patents

Abstract

The present invention relates to a marine DC switchboard having a power management module. One embodiment of the present invention provides a technique for the marine DC switchboard having a power management module. For example, a switchboard according to one embodiment comprises: a DC bus; a plurality of DC lines; a plurality of breakers; and a power management module. The power management module includes: a plurality of DC line sensing modules; a plurality of input/output circuits; and a monitoring module. With the above configuration, states in the switchboard can be monitored, and the configuration inside the switchboard and the configurations outside the switchboard can be controlled.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a DC power distribution board having a power management module,

This embodiment relates to an electric distribution board. More particularly, the present invention relates to an electric distribution panel applied to direct current distribution of a ship.

DC distribution is known as a highly efficient power distribution system in that it does not require a separate power converter when supplying power to the load.

However, since a large number of electronic devices currently commercialized and sold include power conversion devices internally, it is not easy to supply DC distribution to a general area - home or office. In order to increase the efficiency of DC distribution, electronic devices must be driven by DC power directly. In the case of an electronic device including an AC-DC power conversion device internally, DC power must be DC-AC converted and supplied There is a problem that the efficiency is lowered by the dual power conversion process.

However, unlike the general area, it is relatively easy to construct a DC distribution network in case of a ship using an isolated grid and designing the entire system together. For example, in the case of a ship, when designing a system, it is possible to select a load that is directly supplied with DC power, such as a lighting load, a control device load, etc., and a different AC power network - Since it is not necessary to consider linkage with macrogrid, it is relatively easy to construct DC distribution.

Although there is a high possibility that DC distribution will be used for marine transportation, there are few practical examples, and there are many problems to be solved in order to commercialize DC distribution because the research period is not long.

Among the challenges of DC distribution, the most urgent problem to solve is the safety of DC distribution. In the case of AC power, due to the swing of the voltage, even if incomplete contact occurs, the occurrence of overcurrent and the recurrence of the overcurrent do not lead to rapid accidents such as fire. However, in the case of DC power, since the voltage is fixed, when an incomplete contact or the like occurs, the problems such as the overcurrent are continuously maintained without interruption, and the accident is rapidly developed.

However, the countermeasures against such safety problems need to be prepared in the switchboard. In the present technology level, the switchboard used in the AC distribution is used as it is in the DC switchboard of the ship, so measures against the above- It is a fact that it does not become.

In this context, it is an object of the embodiments to provide a technique for a marine DC switchboard comprising a power management module. And, the embodiments are intended to provide various functions (e.g., safety functions) not presented in the conventional switchboard through such a power management module.

To achieve the above-mentioned object, one embodiment includes a DC bus; A first DC line for delivering main power supplied from a fossil fuel generator to the DC bus via a first circuit breaker; A second DC line for transferring charge / discharge power of the energy storage device to the DC bus via a second circuit breaker; A third DC line branching from the DC bus and delivering power formed on the DC bus to the at least one DC load via a third circuit breaker; A fourth DC line branching from the DC bus and delivering power formed on the DC bus to the at least one propulsion motor via a fourth circuit breaker; A plurality of DC line sensing modules each sensing current and voltage of the first DC line, the second DC line, the third DC line and the fourth DC line; A plurality of digital signal input modules for receiving contact signals of the first circuit breaker, the second circuit breaker, the third circuit breaker, and the fourth circuit breaker; A plurality of digital signal output modules for controlling on / off operations of the first circuit breaker, the second circuit breaker, the third circuit breaker, and the fourth circuit breaker; A plurality of analog signal input modules for receiving analog sensing signals; A plurality of analog signal output modules for outputting analog control signals; A memory for storing a line sensing value of the plurality of DC line sensing modules, a contact signal recognition value of the plurality of digital signal input modules, and an analog sensing value of the plurality of analog signal input modules; A monitoring module for transmitting the line sensing value, the contact signal recognition value, and the analog sensing value to an external power control device and transmitting a control command of the power control device to the digital signal output module or the analog signal output module; And a communication line connecting the plurality of digital signal input modules, the plurality of digital signal output modules, the plurality of analog signal input modules, and the plurality of analog signal output modules to the monitoring module .

The energy storage device includes a battery and a bidirectional DC / DC converter, and the amount of power generated by the fossil fuel generator may be controlled according to a state-of-charge (SOC) of the battery.

Wherein the plurality of analog signal input modules receive the analog sensing signal indicating the state of a specific device or a specific space disposed in the ship, and the plurality of analog signal output modules change the state of the specific device or the specific space Can be included in the analog control signal and output to the ship control apparatus.

Further comprising a display device for displaying input / output values of the plurality of digital signal input modules, the plurality of digital signal output modules, the plurality of analog signal input modules, and the plurality of analog signal output modules, Output value, and may display trace data for the input / output value.

Wherein the first circuit breaker, the second circuit breaker, the third circuit breaker, and the fourth circuit breaker are DC breakers, and the abnormal current or abnormal voltage of the first circuit breaker, the second circuit breaker, the third circuit breaker, The circuit breaker corresponding to the detected DC line can be opened.

The fossil fuel generator is connected to the first DC line through a PFC (Power Factor Correction) device, the energy storage device is connected to the second DC line through a bidirectional DC / DC converter included therein, One or more direct current loads may be connected to the third direct current line without a power conversion device, and the at least one propulsion motor may be connected to the fourth direct current line through a DC / AC inverter.

According to the above-described embodiments, various functions (for example, safety functions) not provided by the conventional switchboard can be provided through the power management module.

1 is a configuration diagram of a marine microgrid system according to an embodiment.
2 is a diagram illustrating a detailed configuration of a marine microgrid system according to an embodiment.
3 is a configuration diagram of an electric distribution board according to an embodiment.
4 is a flowchart of an exemplary method of opening a circuit breaker in accordance with one embodiment.
5 is a flow diagram of another exemplary method of opening a circuit breaker in accordance with one embodiment.

Hereinafter, embodiments will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the embodiments, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention unclear.

In describing the components of the embodiments, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected."

1 is a configuration diagram of a marine microgrid system according to an embodiment.

1, the microgrid system 100 includes a generator 10, a converter 112, a distribution board 20, a DC / AC inverter 118, an energy storage device 116, loads 32 and 34, etc. . ≪ / RTI >

The generator 10 may be a device for producing electric power, such as a fossil fuel generator, a fuel cell generator, a renewable energy generator, and the like.

Fossil fuel generators are devices that generate electricity by burning fossil fuels, such as diesel generators and gas generators. Fuel cell generators are power generation devices that supply electricity generated by combining hydrogen or ethanol-based materials with oxygen.

Renewable energy generators are not fuel-consuming power generators, solar generators are a target, and other examples include wind generators, geothermal generators, and small hydro generators.

A fossil fuel generator such as a diesel generator is generally used in the micro grid system 100, but the present embodiment is not limited thereto. For example, the microgrid system 100 may use a fuel cell generator as a main generator. The microgrid system 100 may also include a plurality of generators, for example, the microgrid system 100 may include both a diesel generator and a fuel cell generator, or may include a plurality of diesel generators . When the micro grid system 100 includes a plurality of generators, a converter 112 may be disposed for each generator, and one converter 112 may convert the outputs of the plurality of generators to DC power. Hereinafter, 'converter', 'inverter', 'power conversion device', etc. may be used in common, and each of them may be the same device in terms of power conversion. The apparatus for converting into AC power may be specifically referred to as an 'inverter'. However, depending on the implementation of the embodiment, a device represented by a 'power conversion device' may also be a device that converts AC power. DC power may be referred to as a " converter ", but in some embodiments, a device represented by a " power conversion device " Also, in the case of a DC / AC bidirectional power converter, it may be referred to as an 'inverter' in one aspect and a 'converter' in another aspect. It should not be understood that the function of converting DC power is excluded. In the following, it is not necessary to interpret the "converter", "inverter", and "power conversion device" for a specific purpose and understand its function according to the contents described and the city form of the drawing.

When the generator 10 produces AC power, the converter 112 may be an AC / DC converter. At this time, the AC / DC converter can transmit the electric power generated by the generator 10 as a unidirectional converter to the DC bus (DCB) disposed in the switchboard 20.

In the case where the generator 10 produces DC power - for example, when the generator 10 is a solar generator or a fuel cell generator, the converter 112 may be a DC / DC converter. At this time, the DC / DC converter can transmit power generated by the generator 10 to the DC bus (DCB) as a unidirectional converter.

The energy storage device 116 may include at least one battery and may be powered by a DC bus (DCB) or from a DC bus (DCB).

The energy storage device 116 can store the power of the difference when the power generated by the generator 10 is larger than the power used at the load. Conversely, when the power generated by the generator 10 is less than the power used in the load, the energy storage device 116 can output the difference power to the DC bus (DCB).

The microgrid system 100 can use the energy storage device 116 to reduce fuel consumption of the generator 10, e.g., a diesel generator. For example, the microgrid system 100 can reduce the fuel consumption by stopping the operation of the generator 10 when the amount of power stored in the energy storage device 116 is sufficient.

The DC / AC inverter 118 converts the power formed on the DC bus DCB into AC power and outputs the converted AC power to the DC bus DCB. The DC / AC inverter 118 may be a bi-directional converter. Accordingly, the DC / AC inverter 118 can supply AC power to the outside, and also can receive AC power from the outside and transfer it to the inside.

In the vessel, a plurality of micro grid systems 100 may be connected to each other in the form of a star or a ring bus. At this time, the star-shaped or ring bus-type distribution can be an AC power network (ACB). The DC / AC inverter 118 is able to supply the power formed in the AC power grid ACB to the DC bus (DCB), located between the DC bus (DCB) and the AC power grid (ACB). Then, the DC / AC inverter 118 can transmit the power formed on the DC bus DCB to the external micro grid system through the AC power network ACB.

The DC / AC inverter 118 may be connected to a commercial power grid. When the ship is at anchor, the ship may be connected to a commercial power grid, where the DC / AC inverter 118 may convert the power of the commercial grid and supply it to the DC bus (DCB).

At the time when the DC / AC inverter 118 is connected to the commercial power grid, the generator 10 is not operated and the loads 32 and 34 can use the power supplied from the commercial power grid. Also, at this time, the energy storage device 116 can charge the battery to the maximum set value.

The DC / AC inverter 118 may be connected to the AC load 32. The largest AC load 32 on the ship may be a propulsion motor. The DC / AC inverter 118 can convert the electric power formed on the DC bus (DCB) and supply it to the propulsion motor.

The DC load 34 disposed in the vessel can be directly connected to the DC bus (DCB) in the switchboard 20. The DC load 34 may also include a DC / DC converter or regulator internally, but the power conversion efficiency may be as high as 98%.

2 is a diagram illustrating a detailed configuration of a marine microgrid system according to an embodiment.

Referring to FIG. 2, a plurality of diesel generators 11 may be included in the micro grid system 200.

The plurality of diesel generators 11 can supply electric power to the switchboard 20 through the converters 212a and 212b, respectively. The converters 212a and 212b may be PFC (Power Factor Correction) devices. In the case of the PFC type converters 212a and 212b, AC power can be converted into DC power and the power factor of the generator can be controlled.

The converters 212a and 212b may be controlled in parallel. For example, the first converter 212a and the second converter 212b may be connected to one generator and controlled in parallel with each other. When the first converter 212a and the second converter 212b are controlled in parallel to each other, the lifetime of each of the converters 212a and 212b can be increased by sharing the power processing amount. When the first converter 212a and the second converter 212b are operated in an interleaved manner in parallel control, the voltage ripple of the DC bus DCB disposed in the switchboard 20 may be reduced .

Converters 212a and 212b may share inputs through a switch (first switch SW1). For example, the input of the first converter 212a and the input of the second converter 212b may be connected through a first switch SW1, and when the first switch SW1 is turned on, the first converter 212a And the second converter 212b are controlled in parallel and the first converter 212a and the second converter 212b can operate independently of each other when the first switch SW1 is turned off.

The energy storage device 216 may include at least one battery 232 and a bi-directional DC / DC converter 234 and the like.

The battery 232 may be coupled to a bi-directional DC / DC converter 234.

The bidirectional DC / DC converter 234 can supply power stored in the battery 232 to the DC bus while being connected to the DC bus in the switchboard 20. The bidirectional DC / DC converter 234 can use the electric power formed on the DC bus as the electric power for charging the battery 232.

The bidirectional DC / DC converter 234 can determine the state-of-charge (SOC) of the battery 232. The SOC of the battery 232 can be grasped by a method of summing the input and output currents or can be grasped through the voltage of the battery 232.

The bidirectional DC / DC converter 234 may send the identified SOC to the power control device 220. [

The power control device 220 can control the operation of the generator according to the SOC of the battery 232. [ For example, if the SOC of the battery 232 exceeds the upper limit value (e.g., 80%), the generator may be shut down. Conversely, when the SOC of the battery 232 becomes lower than a lower limit value (for example, 30%), the generator can be restarted.

The DC / AC inverters 218a and 218b may be bi-directional converters.

The DC / AC inverters 218a and 218b can convert the power of the DC bus in the switchboard 20 and transmit it to the AC load 32. [

The outputs of the plurality of DC / AC inverters 218a, 218b may be interconnected. For example, the output of the first DC / AC inverter 218a and the output of the second DC / AC inverter 218b may be connected to each other.

The circuit breaker CB may be located between the load and the DC / AC inverters 218a, 218b. The circuit breaker (CB) can block the line connected to the load if over current flows to the load or if there is a problem with the load.

Switches SW2, SW3, SW4, and SW5 may be placed between the DC / AC inverters 218a and 218b and the output terminal. The DC / AC inverters 218a and 218b may be connected to the AC load 32 or may be disconnected from the AC load 32 according to the connection of the switches SW2, SW3, SW4 and SW5.

The communicable components 212a, 212b, 216, 218a, 218b of the microgrid system 200 may be connected to the power control device 220 via the control lines D1, D2. The control lines D1 and D2 may be two or more. Each of the control lines D1 and D2 may be used for different purposes, for example, a transmission line, a reception line, or may be used in redundancy.

3 is a configuration diagram of an electric distribution board according to an embodiment.

3, the switchboard 20 includes a DC bus DCB, a plurality of DC lines L1 to L4, a plurality of breakers CB1 to CB4, a plurality of DC line sensing modules (DPC) A plurality of digital signal input modules (DICs), a plurality of digital signal output modules (DOCs), a plurality of analog signal input modules (AIC), a plurality of analog signal output modules : Analog Output Coupling), a memory (MMR: Memory), a monitoring module (DPM: DC Power Monitor), and a communication line (CL: Communication Line).

The first DC line L1 can deliver the main power supplied from the fossil fuel generator, for example, a diesel generator, to the DC bus (DCB) via the first circuit breaker CB1.

The DC line sensing module (DPC) can sense the current and voltage of the first DC line (L1). When the first direct current line L1 is connected to one fossil fuel generator, the current flowing in the first direct current line L1 and the voltage formed in the first direct current line L1 are substantially the same as those of the first direct current line L1, Output current and the input / output voltage of the fossil fuel generator connected to the inverter.

The DC line sensing module (DPC) may transmit the line sensing value of the current and voltage of the first DC line (L1) to the monitoring module (DPM). The monitoring module (DPM) can store the line sensing value in the memory (MMR) and transmit the same to an external power control device.

The second DC line L2 can transfer the charge / discharge power of the energy storage device to the DC bus (DCB) via the second circuit breaker CB2.

The DC line sensing module (DPC) can sense the current and voltage of the second DC line (L2). When the second direct current line L2 is connected to one energy storage device, the current flowing in the second direct current line L2 and the voltage formed in the second direct current line L2 are substantially the same as those of the second direct current line L2, Output current and input / output voltage of the energy storage device connected to the power storage device.

The DC line sensing module (DPC) may transmit the line sensing value of the current and voltage of the second DC line (L2) to the monitoring module (DPM). The monitoring module (DPM) can store the line sensing value in the memory (MMR) and transmit the same to an external power control device.

The third DC line L3 branches from the DC bus DCB and can transfer the power formed on the DC bus DCB to the at least one DC load via the third circuit breaker CB3.

The DC line sensing module (DPC) can sense the current and voltage of the third DC line (L3).

The DC line sensing module (DPC) may transmit the line sensing value of the current and voltage of the third DC line (L3) to the monitoring module (DPM). The monitoring module (DPM) can store the line sensing value in the memory (MMR) and transmit the same to an external power control device.

The fourth DC line L4 branches from the DC bus DCB and can transfer the power formed on the DC bus DCB to the at least one propelling motor via the fourth circuit breaker CB4.

The DC line sensing module (DPC) can sense the current and voltage of the fourth DC line (L4).

The DC line sensing module (DPC) may transmit the line sensing value of the current and voltage of the fourth DC line (L4) to the monitoring module (DPM). The monitoring module (DPM) can store the line sensing value in the memory (MMR) and transmit the same to an external power control device.

The digital signal input module DIC can receive contact signals of various contacts including the breakers CB1 to CB4. For example, the plurality of digital signal input modules DIC receive the contact signals of the first, second and third circuit breakers CB1, CB2, CB3 and CB4, Alternatively, the state of engagement according to the engagement signal can be stored in the memory (MMR) through the monitoring module (DPM) and transmitted to the power control device.

The digital signal output module (DOC) can control various digital settings and on / off operations. For example, a plurality of digital signal output modules (DOCs) can control the on-off operation of the first, second, and third circuit breakers CB1, CB2, CB3, and CB4 . The digital signal output module (DOC) receives a control signal from the power control device via the monitoring module (DPM), and can output a digital setting signal or an on-off operation signal according to the control signal.

The analog signal input module (AIC) can receive the analog sensing signal. The analog sensing signal may be, for example, a signal of 4 to 20 mA, which may correspond to pressure, temperature, humidity, and the like. Various sensors may be arranged in the vessel, and the output of these sensors may be an analog sensing signal. For example, a temperature sensor may be attached to a specific device in a ship, a generator, etc. The analog sensing signal output by the temperature sensor is received via an analog signal input module (AIC) Stored in the memory (MMR) and transmitted to the power control device.

The analog signal output module AOC can output an analog control signal. The analog control signal is a signal transmitted to the control circuit of various devices in the ship, for example, a signal input to one terminal of a PID (Proportional Integral Derivative) circuit, for example, a reference terminal, a gain terminal, - can be. The analog signal output module AOC receives a control signal from the power control device via the monitoring module (DPM), and can output an analog control signal according to the control signal.

The memory (MMR) may store various signals generated in the power management module 300. The power management module 300 includes a plurality of DC line sensing modules DPC, a plurality of digital signal input modules DIC, a plurality of digital signal output modules DOC, a plurality of analog signal input modules AIC, A signal output module (AOC), and the like, and the memory (MMR) can store various signals generated in this circuit.

For example, the memory (MMR) may include a line sensing value of a plurality of DC line sensing modules (DPC), a contact signal of a plurality of digital signal input modules (DIC), an analog sensing value of a plurality of analog signal input modules Can be stored. The values stored in the memory (MMR) can be used to display trace data. For example, an administrator may want to track changes over time of a particular signal. Trace data, which displays values stored in memory (MMR) over time, is used by an administrator to track the history of a particular device Can help.

The monitoring module (DPM) manages and controls the respective components included in the power management module 300, and can participate in data transmission / reception with the power control device.

For example, the monitoring module (DPM) transmits a line sensing value, a contact signal recognition value, and an analog sensing value to an external power control device and transmits a control command of the power control device to a digital signal output module (DOC) (AOC).

The configurations in the power management module 300 may be connected through a communication line CL. For example, a plurality of digital signal input modules (DIC), a plurality of digital signal output modules (DOC), a plurality of analog signal input modules (AIC), and a plurality of analog signal output modules (AOC) And can be connected via a communication line CL.

On the other hand, a plurality of analog signal input modules (AIC) may be connected to a specific device (e.g., a generator, an energy storage device, a load, etc.) or a specific space And a plurality of analog signal output modules (AOC) receive a setting change value for changing the state of this specific device or a specific space to an analog It can be output to a ship control device (for example, a temperature / humidity control device, a pressure control device, etc.) by including it in a control signal.

Although not shown in the drawing, the switchboard 20 may further include a display device. The display device can display input / output values of a plurality of digital signal input modules (DIC), a plurality of digital signal output modules (DOC), a plurality of analog signal input modules (AIC), and a plurality of analog signal output modules (AOC) . The display device may display an alarm for input / output values exceeding a reference value, and may display trace data for the input / output values.

The first circuit breaker CB1, the second circuit breaker CB2, the third circuit breaker CB3 and the fourth circuit breaker CB4 are DC circuit breakers and the first circuit breaker CB1, the second circuit breaker CB2, CB3) and the fourth circuit breaker (CB4), the circuit breakers corresponding to the DC lines (L1 to L4) for detecting the abnormal current or the abnormal voltage may be opened.

4 is a flowchart of an exemplary method of opening a circuit breaker in accordance with one embodiment.

The control of FIG. 4 may be performed by a power management module, or may be performed by a control-monitoring module of a power control device. In the following, it is assumed that the control of Fig. 4 is performed by the power control apparatus.

Referring to FIG. 4, the power control apparatus can confirm the voltage Vdcb of the DC bus (S400).

The DC bus is connected to a power supply device (for example, a generator, an energy storage device, etc.), and a power consuming device (for example, a load, an energy storage device, etc.) is connected. When the supply of power and the consumption of power in the system are balanced, a constant voltage is formed on the DC bus, but when the supply of power is increased, the voltage (Vdcb) of the DC bus increases, The voltage Vdcb of the DC bus is reduced.

If the voltage Vdcb of the DC bus is higher than the first voltage reference value (YES in S402), the power control device compares the voltage Vdcb of the DC bus with the first voltage reference value (S402) The current Idl can be confirmed (S404). If a failure occurs in a device connected to a particular DC line or if a particular DC line fails - for example, a short fault, the current will increase in the corresponding DC line, causing the voltage (Vdcb) Can be increased.

The power control device compares the DC line current Idl with the first current reference value to check the DC line causing the problem (S406). If the DC line current Idl exceeds the first current reference value ( YES in S406), the circuit breaker of the corresponding DC line can be opened (S408).

Here, the first current reference value may be lower than the cutoff current value set in the breaker. The circuit breaker may be set to cut off if a current of more than a certain level flows itself, and the first current reference value mentioned above may be a value lower than this value. The first current reference value may be understood as a current value that is not large enough to cause the circuit breaker to operate, but causes a problem throughout the system.

5 is a flow diagram of another exemplary method of opening a circuit breaker in accordance with one embodiment.

Referring to FIG. 5, the power control apparatus can confirm the voltage Vdcb of the DC bus (S500) and compare the voltage Vdcb of the DC bus with the second voltage reference value. As the power consumption increases due to a problem with a specific load, the voltage (Vdcb) of the DC bus decreases. The power control device can monitor the voltage (Vdcb) of the DC bus to isolate this problem load from the system have.

If the voltage Vdcb of the DC bus is smaller than the second voltage reference value (YES in S502), the power control apparatus can confirm the DC line current Idl for each DC line (S504).

If the DC line current Id1 exceeds the second current reference value (YES in S506), the power control device compares the DC line current Id1 with the second current reference value (S506) (S508).

Here, the second current reference value may be lower than the cutoff current value set in the breaker. The circuit breaker may be set to be cut off when a current of more than a certain level flows itself, and the second current reference value mentioned above may be a value lower than this value. The second current reference value is not a current large enough to cause the breaker to operate but can be understood as a current value causing a problem throughout the system.

According to the embodiment described above, it is possible to provide various functions (for example, safety functions) not provided by the conventional switchboard through the power management module.

It is to be understood that the terms "comprises", "comprising", or "having" as used in the foregoing description mean that the constituent element can be implanted unless specifically stated to the contrary, But should be construed as further including other elements. All terms including technical or scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiments belong, unless otherwise defined. Commonly used terms, such as predefined terms, are to be interpreted as being consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless explicitly defined in the embodiments.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (6)

DC bus;
A first DC line for delivering main power supplied from a fossil fuel generator to the DC bus via a first circuit breaker;
A second DC line for transferring charge / discharge power of the energy storage device to the DC bus via a second circuit breaker;
A third DC line branching from the DC bus and delivering power formed on the DC bus to the at least one DC load via a third circuit breaker;
A fourth DC line branching from the DC bus and delivering power formed on the DC bus to the at least one propulsion motor via a fourth circuit breaker;
A plurality of DC line sensing modules each sensing current and voltage of the first DC line, the second DC line, the third DC line and the fourth DC line;
A plurality of digital signal input modules for receiving contact signals of the first circuit breaker, the second circuit breaker, the third circuit breaker, and the fourth circuit breaker;
A plurality of digital signal output modules for controlling on / off operations of the first circuit breaker, the second circuit breaker, the third circuit breaker, and the fourth circuit breaker;
A plurality of analog signal input modules for receiving analog sensing signals;
A plurality of analog signal output modules for outputting analog control signals;
A memory for storing a line sensing value of the plurality of DC line sensing modules, a contact signal recognition value of the plurality of digital signal input modules, and an analog sensing value of the plurality of analog signal input modules;
A monitoring module for transmitting the line sensing value, the contact signal recognition value, and the analog sensing value to an external power control device and transmitting a control command of the power control device to the digital signal output module or the analog signal output module; And
A communication line connecting the plurality of digital signal input modules, the plurality of digital signal output modules, the plurality of analog signal input modules, and the plurality of analog signal output modules to the monitoring module,
/ RTI >
Wherein the first circuit breaker, the second circuit breaker, the third circuit breaker, and the fourth circuit breaker are DC breakers, and the abnormal current or abnormal voltage of the first circuit breaker, the second circuit breaker, the third circuit breaker, The circuit breaker corresponding to the sensed DC line is opened
DC switchboard for ships. The method according to claim 1,
The energy storage device includes a battery and a bi-directional DC / DC converter,
Wherein the power generation amount of the fossil fuel generator is controlled according to a state-of-charge (SOC) of the battery. The method according to claim 1,
Wherein the plurality of analog signal input modules receive the analog sensing signal indicating the state of a specific device or a specific space disposed in the ship,
Wherein the plurality of analog signal output modules include a setting change value for changing the state of the specific device or the specific space to the analog control signal and output to the ship control device. The method according to claim 1,
Further comprising a display device for displaying input / output values of the plurality of digital signal input modules, the plurality of digital signal output modules, the plurality of analog signal input modules, and the plurality of analog signal output modules,
Wherein the display device displays an alarm for the input / output value exceeding a reference value and displays trace data for the input / output value. delete DC bus;
A first DC line for delivering main power supplied from a fossil fuel generator to the DC bus via a first circuit breaker;
A second DC line for transferring charge / discharge power of the energy storage device to the DC bus via a second circuit breaker;
A third DC line branching from the DC bus and delivering power formed on the DC bus to the at least one DC load via a third circuit breaker;
A fourth DC line branching from the DC bus and delivering power formed on the DC bus to the at least one propulsion motor via a fourth circuit breaker;
A plurality of DC line sensing modules each sensing current and voltage of the first DC line, the second DC line, the third DC line and the fourth DC line;
A plurality of digital signal input modules for receiving contact signals of the first circuit breaker, the second circuit breaker, the third circuit breaker, and the fourth circuit breaker;
A plurality of digital signal output modules for controlling on / off operations of the first circuit breaker, the second circuit breaker, the third circuit breaker, and the fourth circuit breaker;
A plurality of analog signal input modules for receiving analog sensing signals;
A plurality of analog signal output modules for outputting analog control signals;
A memory for storing a line sensing value of the plurality of DC line sensing modules, a contact signal recognition value of the plurality of digital signal input modules, and an analog sensing value of the plurality of analog signal input modules;
A monitoring module for transmitting the line sensing value, the contact signal recognition value, and the analog sensing value to an external power control device and transmitting a control command of the power control device to the digital signal output module or the analog signal output module; And
A communication line connecting the plurality of digital signal input modules, the plurality of digital signal output modules, the plurality of analog signal input modules, and the plurality of analog signal output modules to the monitoring module,
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The fossil fuel generator is connected to the first DC line through a PFC (Power Factor Correction)
The energy storage device is connected to the second DC line via a bidirectional DC / DC converter included therein,
Wherein the at least one DC load is connected to the third DC line without a power converter,
Wherein the at least one propulsion motor is connected to the fourth DC line via a DC / AC inverter.

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