Charging system, charging method, and program

Abstract

To provide a charging system that can improve charging of a capacitor in a direct current micro grid when a bus tie capacitor exists.SOLUTION: A charging system has a charging circuit that is connected between both terminals of at least one capacitor at an input of a plurality of power converters, and charges the capacitor when first and second switching elements are in an OFF state.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a charging system, a charging method, and a program.

Background Art

[0002] In a limited space such as a ship, it is required to effectively utilize energy. As a related technique, Patent Document 1 discloses a technique related to a marine electric propulsion device capable of obtaining an energy saving effect.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in a limited space such as a ship, it is desired that the power flux between DC microgrids is large. On the other hand, in a DC microgrid, a large-capacity bus tie capacitor is often used. In that case, since the capacitor in the DC microgrid is not energized, the DC microgrid may not operate properly due to the failure to reach an appropriate bias state. On the other hand, when charging the capacitor in the DC microgrid via the bus tie capacitor, it takes time to charge due to the large capacity of the bus tie capacitor. Therefore, there is a need for a technology that can improve the charging of the capacitor in the DC microgrid when there is a bus tie capacitor.

[0005] The present disclosure has been made to solve the above problems, and an object thereof is to provide a charging system, a charging method, and a program that can improve the charging of a capacitor in a DC microgrid when there is a bus tie capacitor.

Means for Solving the Problem

[0006] To solve the above problems, the charging system according to the present disclosure includes a first fuse to which a positive electrode wiring of a bus connected to another DC microgrid to be coordinated is connected to a first terminal, and a plurality of power converters are connected to a second terminal via a plurality of fuses. The positive electrode wiring of the bus is connected, a second fuse to which the negative electrode wiring of the bus connected to the other DC microgrid is connected to the first terminal, and a plurality of power converters are connected to the second terminal via a plurality of fuses. The negative electrode wiring of the bus is connected, a first capacitor having a capacitance capable of cutting at least one of the first fuse and the second fuse, the first terminal is connected to the positive electrode wiring of the bus to which the other DC microgrid is connected, and the second terminal is connected to the negative electrode wiring of the bus to which the other DC microgrid is connected. The first capacitor is provided, and each of the plurality of power converters includes a bridge circuit that generates AC power from DC power supplied by the positive electrode wiring of the bus to which the plurality of power converters are connected and the negative electrode wiring of the bus to which the plurality of power converters are connected, and is provided in parallel with the input terminals of the bridge circuit. A second capacitor for smoothing the DC power, a first switching element provided between the positive electrode wiring of the bus to which the plurality of power converters are connected and the bridge circuit, and a second switching element provided in parallel with the first switching element. A first path having a resistor connected in series with the second switching element, and a charging circuit that charges the second capacitor when the first switching element and the second switching element are in an off state is further provided between both terminals of at least one of the plurality of power converters and the second capacitor.

[0007] The charging method according to the present disclosure includes: a positive electrode wiring of a bus to which another DC microgrid to be coordinated is connected is connected to a first terminal, and a first fuse to which the positive electrode wiring of the bus to which a plurality of power converters are connected via a plurality of fuses is connected is connected to a second terminal; a negative electrode wiring of the bus to which the another DC microgrid is connected is connected to the first terminal, and a second fuse to which the negative electrode wiring of the bus to which a plurality of power converters are connected via a plurality of fuses is connected is connected to the second terminal; a first capacitor having a capacitance capable of disconnecting at least one of the first fuse and the second fuse, with a first terminal connected to the positive electrode wiring of the bus to which the another DC microgrid is connected and a second terminal connected to the negative electrode wiring of the bus to which the another DC microgrid is connected; each of the plurality of power converters includes a bridge circuit that generates AC power from DC power supplied by the positive electrode wiring of the bus to which the plurality of power converters are connected and the negative electrode wiring of the bus to which the plurality of power converters are connected, a second capacitor provided in parallel with input terminals of the bridge circuit to smooth the DC power, a first switching element provided between the positive electrode wiring of the bus to which the plurality of power converters are connected and the bridge circuit, a first path having a second switching element provided in parallel with the first switching element and a resistor connected in series with the second switching element; a charging system is connected between both terminals of the second capacitor of at least one of the plurality of power converters, and charges the second capacitor when the first switching element and the second switching element are in an off state.

[0008] The program according to the present disclosure is such that the positive electrode wiring of the bus to which another DC microgrid to be linked is connected is connected to the first terminal, and the positive electrode wiring of the bus to which a plurality of power converters are connected via a plurality of fuses is connected to the second terminal. A first fuse, the negative electrode wiring of the bus to which the other DC microgrid is connected is connected to the first terminal, and the negative electrode wiring of the bus to which a plurality of power converters are connected via a plurality of fuses is connected to the second terminal. A second fuse, a first terminal is connected to the positive electrode wiring of the bus to which the other DC microgrid is connected, a second terminal is connected to the negative electrode wiring of the bus to which the other DC microgrid is connected, and at least one of the first fuse and the second fuse is provided. A first capacitor having a capacitance capable of being cut off, each of the plurality of power converters includes a bridge circuit that generates AC power from DC power supplied by the positive electrode wiring of the bus to which the plurality of power converters are connected and the negative electrode wiring of the bus to which the plurality of power converters are connected, and is provided in parallel with the input terminals of the bridge circuit. A second capacitor for smoothing the DC power, a first switching element provided between the positive electrode wiring of the bus to which the plurality of power converters are connected and the bridge circuit, and a second switching element provided in parallel with the first switching element. A first path having a resistor connected in series with the second switching element, and is connected between both terminals of at least one of the second capacitors of the plurality of power converters. When the first switching element and the second switching element are in an off state, the second capacitor is charged.

Effect of the Invention

[0009] According to the charging system, charging method, and program according to the present disclosure, it is possible to improve the charging of the capacitor in the DC microgrid when the bus capacitor exists.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Mode for Carrying Out the Invention

[0011] <Embodiment> Hereinafter, embodiments will be described in detail with reference to the drawings. A charging system according to an embodiment of the present disclosure will be described.

[0012] (Configuration of Charging System) FIG. 1 is a diagram showing an example of the configuration of a charging system 1 according to an embodiment of the present disclosure. As shown in FIG. 1, the charging system 1 includes DC microgrids 10a and 10b, loads 20a and 20b, a charging circuit 30, an onshore power source 40, an in-ship AC system 50, switching elements 60 and 70, and a host device 80. The charging system 1 is a system used, for example, in a ship. In the charging system 1, the DC microgrids 10a and 10b cooperate with each other. The charging system 1 is a system capable of improving the charging of capacitors in a DC microgrid when a bus tie capacitor exists.

[0013] As shown in FIG. 1, the DC microgrid 10a includes bus tie fuses 101p (an example of a first fuse) and 101n (an example of a second fuse), a plurality of fuses 102p and 102n, a plurality of power converters 103, a control device 104, an initial charging sequence 105, a capacitor 106 (an example of a first capacitor), and a voltage sensor 107. Note that the number of each of the fuses 102p and 102n is the same as the number of the power converters 103, and is three in the example shown in FIG. 1.

[0014] The bus tie fuse 101p is a fuse provided in the positive electrode wiring P of the bus in the charging system 1. The bus tie fuse 101n is a fuse provided in the negative electrode wiring N of the bus in the charging system 1.

[0015] As shown in FIG. 1, each of the plurality of fuses 102p is provided between the positive electrode wiring P and one of the plurality of power converters 103. As shown in FIG. 1, each of the plurality of fuses 102n is provided between the negative electrode wiring N and one of the plurality of power converters 103.

[0016] As shown in FIG. 1, each of the plurality of power converters 103 is connected to the positive electrode wiring P via one fuse 102p. As shown in FIG. 1, each of the plurality of power converters 103 is connected to the negative electrode wiring N via one fuse 102n. As shown in FIG. 1, each of the plurality of power converters 103 is connected to the load 20a.

[0017] As shown in FIG. 1, each of the plurality of power converters 103 includes a bridge circuit 103a, a capacitor 103b (an example of a second capacitor), a switching circuit 103c, and a voltage sensor 103d.

[0018] The bridge circuit 103a is a circuit that generates three-phase AC power from DC power. The bridge circuit 103a is configured using, for example, transistors. Examples of transistors include power semiconductor devices such as SiCMOSFET (Silicon Carbide Metal Oxide Semiconductor Field Effect Transistor) and IGBT (Insulated Gate Bipolar Transistor).

[0019] The capacitor 103b smoothes the DC voltage input to the bridge circuit 103a. The switching circuit 103c is a circuit that switches the connection between the bridge circuit 103a and the positive electrode wiring P of the bus. As shown in FIG. 1, the switching circuit 103c includes a resistor 103c1, and switching elements 103c2 and 103c3. The resistor 103c1 and the switching element 103c2 are connected in series. The switching element 103c3 is connected in parallel to the resistor 103c1 and the switching element 103c2 connected in series. Examples of the switching elements 103c2 and 103c3 include power semiconductor devices such as SiCMOSFET and IGBT, and physical switches. The voltage sensor 103d detects the potential difference between both ends of the capacitor 103b provided in each power converter 103.

[0020] The control device 104 controls the power converter 103 under the control of the upper-level device 80. The initial charging sequence 105 controls the charging state in the initial operation of the generator G in the load 20a. The capacitor 106 accumulates charges capable of disconnecting the bus tie fuses 101p and 101n. The voltage sensor 107 detects the potential difference between the positive electrode wiring P and the negative electrode wiring N of the bus, that is, the potential difference across both ends of the capacitor 106. Note that each of the plurality of power converters 103 may be provided with a control device 104, and the control device 104 may control each process in the power converter 103.

[0021] As shown in FIG. 1, the load 20a includes a generator 201, a charging device 202, and a voltage conversion device 203. The generator 201 generates electric power. As shown in FIG. 1, the charging device 202 includes a DCL 202a, a switching circuit 202b, and a battery 202c. As shown in FIG. 1, the switching circuit 202b includes a resistor 202b1, switching elements 202b2, 202b3. The resistor 202b1 and the switching element 202b2 are connected in series. The switching element 202b3 is connected in parallel to the resistor 202b1 and the switching element 202b2 connected in series. Examples of the switching elements 103c2 and 103c3 include power semiconductor elements such as SiCMOSFET and IGBT, and physical switches.

[0022] As shown in FIG. 1, the voltage conversion device 203 includes a filter 203a, an AC-AC (Alternative current to Alternative current) converter 203b, and a switching element 203c. The filter 203a includes a reactor 203a1 and a capacitor 203a2. The filter 203a removes high-frequency components. The AC-AC converter 203b converts an AC voltage into an AC voltage with a different voltage amplitude. Examples of the AC-AC converter 203b include a transformer and the like. The switching element 203c determines whether or not to connect to the onshore power supply 40. Specifically, when the switching element 203c is in the on state, the load 20a is connected to the onshore power supply 40. Also, when the switching element 203c is in the off state, the load 20a is not connected to the onshore power supply 40.

[0023] As shown in FIG. 1, the charging circuit 30 includes AC-AC converters 30a and 30e, a generator 30b, switching elements 30c and 30d, and a rectifier circuit 30f.

[0024] The AC-AC converter 30a converts an AC voltage into an AC voltage with a different voltage amplitude. Examples of the AC-AC converter 30a include a transformer and the like. This AC-AC converter 30a steps down the voltage output by the onshore power supply 40 to the voltage output by the generator 30b.

[0025] The generator 30b generates electric power. The generator 30b is, for example, a portable generator or a small generator.

[0026] The switching elements 30c and 30d are elements for selecting whether the power source used for charging in the charging circuit 30 is the generator 30b or the onshore power source 40. When the switching element 60 is in the off state and the switching elements 30c and 30d are in the on state, it means that the power source used for charging in the charging circuit 30 is the generator 30b. Also, when the switching element 60 is in the on state, the switching element 30c is in the off state, and the switching element 30d is in the on state, it means that the power source used for charging in the charging circuit 30 is the onshore power source 40.

[0027] The AC-AC converter 30e converts an AC voltage into an AC voltage with a different voltage amplitude. Examples of the AC-AC converter 30a include a transformer and the like. This AC-AC converter 30e is common to both the generator 30b and the onshore power source 40.

[0028] The rectifier circuit 30f rectifies the AC voltage output by the AC-AC converter 30e and charges at least one of the capacitors 103b provided in the plurality of power converters 103. This charging continues until the voltage sensor 103d detects a predetermined voltage.

[0029] The onshore power source 40 is a power source provided onshore. For example, when a ship equipped with the charging system 1 docks, power is supplied from the onshore power source 40 to the ship. The in-ship AC system 50 is a terminal capable of inputting and outputting power connected to the AC power system on the ship. The switching element 60 is an element that determines whether to connect the onshore power source 40 to any one of the load 20a, the charging circuit 30, and the in-ship AC system 50. The switching element 70 is an element that determines whether to connect the in-ship AC system 50 to any one of the load 20a, the charging circuit 30, and the onshore power source 40. The upper device 80 overall manages the information of the entire charging system 1, acquires the information of the DC microgrids 10a, 10b, the loads 20a, 20b, the charging circuit 30, the onshore power source 40, the in-ship AC system 50, the switching elements 60, 70 respectively, and outputs commands to the DC microgrids 10a, 10b, the loads 20a, 20b, the charging circuit 30, the onshore power source 40, the in-ship AC system 50, the switching elements 60, 70 respectively.

[0030] The DC microgrid 10b has the same configuration as the DC microgrid 10a. The load 20b is a load connected to each of the power converters 103 of the DC microgrid 10b. Note that the load 20b may have the same configuration as the load 20a, or the configurations of the load 20b and the load 20a may be different.

[0031] (Processing performed by the charging system) Next, with reference to FIGS. 2 to 11, the processing performed by the charging system 1 will be described.

[0032] (Processing for charging the capacitor 103b) First, with reference to FIGS. 2 to 4, the process of charging the capacitor 103b of the power converter 103 at the start of operation of the charging system 1 will be described. Here, it is assumed that the switching elements described below are directly or indirectly controlled by the upper device 80. Specifically, the switching elements in the DC microgrid 10a are controlled by the control device 104 under the control of the upper device 80, and the load 20a, the charging circuit 30, and the switching elements 60 and 70 are directly controlled by the upper device 80.

[0033] FIG. 2 is a diagram showing an example of a first processing flow of the charging system 1 according to an embodiment of the present disclosure. FIG. 3 is a first diagram for explaining the charging of the capacitor 103b in an embodiment of the present disclosure. FIG. 4 is a second diagram for explaining the charging of the capacitor 103b in an embodiment of the present disclosure. As shown in FIG. 3, the charging circuit 30 is connected to both ends of at least one capacitor 103b. In the example shown in FIG. 3, the charging circuit 30 is connected to three capacitors 103b.

[0034] As shown in FIG. 3, under the control of the upper device 80, the control device 104 controls the switching elements 103c2 and 103c3 in the DC microgrid 10a to be in the off state, and the upper device 80 controls the switching elements 30c and 203c to be in the off state and the switching elements 30d, 60, and 70 to be in the on state, respectively (step S1). Or, as shown in FIG. 4, under the control of the upper device 80, the control device 104 controls the switching elements 103c2 and 103c3 in the DC microgrid 10a to be in the off state, and the upper device 80 controls the switching elements 60, 70, and 203c to be in the off state and the switching elements 30c and 30d to be in the on state, respectively (step S1).

[0035] In this case, current flows from the charging circuit 30 to the capacitor 103b, and the capacitor 103b is charged. The host device 80 acquires the potential difference between both ends of the capacitor 103b detected by each voltage sensor 103d, that is, the voltage of the capacitor 103b. The host device 80 determines whether the acquired voltage is within a predetermined voltage (step S2). When the host device 80 determines that the voltage of the capacitor 103b for which the acquired voltage is not within the predetermined voltage (NO in step S2), it returns to the process of step S2. Further, when the host device 80 determines that the voltage of the capacitor 103b for which the acquired voltage is within the predetermined voltage (YES in step S2), it ends the charging process of the capacitor 103b. The above is the process of charging the capacitor 103b performed by the charging system 1.

[0036] (Process of charging capacitor 106) Next, the process of charging the capacitor 106 of the power converter 103 at the start of operation of the charging system 1 will be described with reference to FIGS. 5 to 8.

[0037] FIG. 5 is a diagram showing an example of a second processing flow of the charging system 1 according to an embodiment of the present disclosure. FIG. 6 is a first diagram for explaining the charging of the capacitor 106 in an embodiment of the present disclosure. FIG. 7 is a second diagram for explaining the charging of the capacitor 106 in an embodiment of the present disclosure. FIG. 8 is a third diagram for explaining the charging of the capacitor 106 in an embodiment of the present disclosure. Here, since the charging of the capacitor 103b is completed, it is assumed that the switching elements 30c and 30d are controlled to be in the off state.

[0038] The charging of the capacitor 106 is performed by supplying power from the load. First, the charging of the capacitor 106 when the load shown in FIG. 6 is the voltage conversion device 203 will be described. When the load is the voltage conversion device 203, the host device 80 controls the switching elements 60, 70, and 203c to be in the on state (step S11). Also, under the control of the host device 80, the control device 104 controls the switching element 103c2 in the power converter 103 where the load is the voltage conversion device 203 to be in the on state and the switching element 103c3 to be in the off state (step S11).

[0039] In this case, even when the switching element 103c2 is in the on state, the discharge of the charge stored in the capacitor 103b by the resistor 103c1 is slight, and the voltage of the capacitor 103b is maintained at a predetermined voltage. Therefore, it becomes possible to flow a current from the terrestrial power supply 40 to the DC microgrid 10a through the load voltage conversion device 203. In this case, the current flows through the resistor 103c1, the fuse 102p, the bus tie fuse 101p, and then through the capacitor 106. That is, the capacitor 106 is charged. The host device 80 acquires the potential difference between both ends of the capacitor 106 detected by the voltage sensor 107, that is, the voltage of the capacitor 106. The host device 80 determines whether the acquired voltage is within a predetermined voltage (step S12). If the host device 80 determines that the acquired voltage is not within the predetermined voltage (NO in step S12), it returns to the process of step S12. Also, if the host device 80 determines that the acquired voltage is within the predetermined voltage (YES in step S12), it ends the process of charging the capacitor 106.

[0040] Next, the charging of the capacitor 106 when the load shown in FIG. 7 is the charging device 202 will be described. When the load is the charging device 202, the host device 80 controls the switching elements 60, 70, 202b3, and 203c to be in the off state, and controls the switching element 202b2 to be in the on state (step S11). Also, under the control of the host device 80, the control device 104 controls the switching element 103c2 in the power converter 103 where the load is the charging device 202 to be in the on state and the switching element 103c3 to be in the off state (step S11).

[0041] In this case, even when the switching element 103c2 is in the on state, the discharge of the charge stored in the capacitor 103b due to the resistor 103c1 is slight, and the voltage of the capacitor 103b is maintained at a predetermined voltage. Therefore, it becomes possible to flow a current from the onshore power supply 40 to the DC microgrid 10a via the charging device 202 which is the load. In this case, the current flows through the resistor 103c1, the fuse 102p, the bus tie fuse 101p, and through the capacitor 106. That is, the capacitor 106 is charged. The host device 80 acquires the potential difference between both ends of the capacitor 106 detected by the voltage sensor 107, that is, the voltage of the capacitor 106. The host device 80 determines whether or not the acquired voltage is within a predetermined voltage (step S12). When the host device 80 determines that the acquired voltage is not within the predetermined voltage (NO in step S12), it returns to the process of step S12. Also, when the host device 80 determines that the acquired voltage is within the predetermined voltage (YES in step S12), the charging process of the capacitor 106 is terminated.

[0042] Next, the charging of the capacitor 106 when the load shown in FIG. 8 is the generator 201 will be described. When the load is the generator 201, the host device 80 controls the switching elements 60, 70, 202b2, 202b3, and 203c to be in the off state (step S11). Also, under the control of the host device 80, the control device 104 controls the switching element 103c2 in the power converter 103 where the load is the generator 201 to be in the on state and the switching element 103c3 to be in the off state (step S11).

[0043] In this case, even when the switching element 103c2 is turned on, the discharge of the charge stored in the capacitor 103b due to the resistor 103c1 is slight, and the voltage of the capacitor 103b is maintained at a predetermined voltage. Therefore, it becomes possible to flow a current from the onshore power supply 40 to the DC microgrid 10a via the load, i.e., the generator 201. In this case, the current flows through the resistor 103c1, the fuse 102p, the bus tie fuse 101p, and then through the capacitor 106. That is, the capacitor 106 is charged. The host device 80 acquires the potential difference between both ends of the capacitor 106 detected by the voltage sensor 107, i.e., the voltage of the capacitor 106. The host device 80 determines whether the acquired voltage is within a predetermined voltage (step S12). If the host device 80 determines that the acquired voltage is not within the predetermined voltage (NO in step S12), it returns to the process of step S12. Also, when the host device 80 determines that the acquired voltage is within the predetermined voltage (YES in step S12), it ends the charging process of the capacitor 106. The above is the process of charging the capacitor 106 performed by the charging system 1. Note that, at this stage, the charging of the capacitors 103b and 106 is completed.

[0044] (Processing after capacitor charging) Next, the processing after charging the capacitors 103b and 106 of the charging system 1 will be described with reference to FIGS. 9 to 11.

[0045] FIG. 9 is a diagram showing a first example of the processing performed by the charging system 1 according to an embodiment of the present disclosure. FIG. 10 is a diagram showing a second example of the processing performed by the charging system 1 according to an embodiment of the present disclosure. FIG. 11 is a diagram showing a third example of the processing performed by the charging system 1 according to an embodiment of the present disclosure.

[0046] First, the process performed by the charging system 1 shown in FIG. 9 will be described. FIG. 9 is a process of flowing a current from the onshore power source 40 to the DC microgrid 10a via the voltage conversion device 203 as a load and charging the battery 202c with that current. In this case, the upper device 80 controls the switching elements 60, 70, 202b3, and 203c to be in the on state and controls the switching element 202b2 to be in the off state. Also, under the control of the upper device 80, the control device 104 controls the switching element 103c2 in the power converter 103 where the load is the voltage conversion device 203 to be in the on state and the switching element 103c3 to be in the off state. Further, under the control of the upper device 80, the control device 104 controls the switching element 103c2 in the power converter 103 where the load is the charging device 202 to be in the off state and the switching element 103c3 to be in the on state. As a result, a current flows from the onshore power source 40 to the battery 202c via the voltage conversion device 203 and the DC microgrid 10a. Due to this current, the battery 202c is charged.

[0047] Next, the process performed by the charging system 1 shown in FIG. 10 will be described. FIG. 10 is a process of flowing a current from the charging device 202 to the in-ship AC system 50 via the voltage conversion device 203 as a load. In this case, the upper device 80 controls the switching elements 70 and 202b2 to be in the on state and controls the switching elements 60 and 202b3 to be in the off state. Also, under the control of the upper device 80, the control device 104 controls the switching element 103c2 in the power converter 103 where the load is the charging device 202 to be in the on state and the switching element 103c3 to be in the off state. Further, under the control of the upper device 80, the control device 104 controls the switching element 103c2 in the power converter 103 where the load is the voltage conversion device 203 to be in the off state and the switching element 103c3 to be in the on state. As a result, a current flows from the battery 202c to the in-ship AC system 50 via the DC microgrid 10a and the voltage conversion device 203. That is, power can be supplied to the in-ship AC system 50.

[0048] Next, the processing performed by the charging system 1 shown in FIG. 10 will be described. FIG. 10 is a process of flowing a current from the charging device 202 to the in-ship AC system 50 via the voltage conversion device 203 which is a load. In this case, the host device 80 controls the switching elements 70 and 202b2 to be in the on state, and controls the switching elements 60 and 202b3 to be in the off state. Further, under the control of the host device 80, the control device 104 controls the switching element 103c2 in the power converter 103 where the load is the charging device 202 to be in the on state and the switching element 103c3 to be in the off state. Further, under the control of the host device 80, the control device 104 controls the switching element 103c2 in the power converter 103 where the load is the voltage conversion device 203 to be in the off state and the switching element 103c3 to be in the on state. As a result, a current flows from the battery 202c to the in-ship AC system 50 via the DC microgrid 10a and the voltage conversion device 203. That is, power can be supplied to the in-ship AC system 50.

[0049] Next, the processing performed by the charging system 1 shown in FIG. 11 will be described. FIG. 11 is a process of flowing a current from the generator 201 to the in-ship AC system 50 via the voltage conversion device 203 which is a load and charging the battery 202c in the charging device 202. In this case, the host device 80 controls the switching elements 70, 202b3, and 203c to be in the on state, and controls the switching elements 60 and 202b2 to be in the off state. Further, under the control of the host device 80, the control device 104 controls the switching element 103c3 in the power converter 103 where the load is the charging device 202 to be in the on state and the switching element 103c2 to be in the off state. Further, under the control of the host device 80, the control device 104 controls the switching element 103c2 in the power converter 103 where the load is the voltage conversion device 203 to be in the off state and the switching element 103c3 to be in the on state. As a result, a current flows from the generator 201 to the battery 202c via the DC microgrid 10a. Also, as a result, a current flows from the generator 201 to the in-ship AC system 50 via the DC microgrid 10a and the voltage conversion device 203. That is, power can be supplied to the in-ship AC system 50.

[0050] (Function and Effect) As described above, the charging system 1 according to one embodiment of the present disclosure has been described. In the charging system 1, the positive electrode wiring P of the bus to which another DC microgrid 10b to be coordinated is connected is connected to the first terminal, and the positive electrode wiring P of the bus to which a plurality of power converters 103 are connected via a plurality of fuses 102p is connected to the second terminal. A first fuse 101p, the negative electrode wiring N of the bus to which the other DC microgrid 10b is connected is connected to the first terminal, and the negative electrode wiring N of the bus to which a plurality of power converters are connected via a plurality of fuses 102n is connected to the second terminal. A second fuse 101n, a first terminal is connected to the positive electrode wiring P of the bus to which the other DC microgrid 10b is connected, a second terminal is connected to the negative electrode wiring N of the bus to which the other DC microgrid 10b is connected, and at least one of the first fuse 101p and the second fuse 101n is provided. A first capacitor 106 having a capacitance that can be cut off, and each of the plurality of power converters 103 includes a positive electrode wiring P of the bus to which the plurality of power converters 103 are connected and a negative electrode wiring N of the bus to which the plurality of power converters 103 are connected. A bridge circuit 103a that generates AC power from the supplied DC power, a second capacitor 103b that is provided in parallel with the input terminals of the bridge circuit 103a and smoothes the DC power, and a first capacitor 103b that is provided between the positive electrode wiring P of the bus to which the plurality of power converters 103 are connected and the bridge circuit 103a. A first switching element 103c3, a second switching element 103c2 provided in parallel with the first switching element 103c3, and a first path having a resistor 103c1 connected in series with the second switching element 103c2. A charging circuit 30 that is connected between both terminals of at least one of the second capacitors 103b of the plurality of power converters 103 and charges the second capacitor 103b when the first switching element 103c3 and the second switching element 103c2 are in an off state is further provided.

[0051] As a result, in the charging system 1, the first capacitor 106 is charged, enabling cooperation between the DC microgrid 10a and the load 20a. Therefore, it is also possible to charge the capacitor 106 in the DC microgrid 10a from the load 20a. As a result, it is possible to improve the charging of the capacitors 103b and 106 in the DC microgrid 10a when the bus tie capacitor 106 is present.

[0052] <Modification of the Embodiment> FIG. 12 is a diagram showing an example of the configuration of the charging system 1 according to a modification of the embodiment of the present disclosure. In the charging system 1 according to the modification of the embodiment of the present disclosure, the first terminal and the second terminal of the first capacitor 106 may be connected via a bus tie fuse 101n (second fuse 101n) as shown in FIG. 12. Further, in the charging system 1 according to the modification of the embodiment of the present disclosure, the voltage sensor 107 may acquire the potential difference between both ends of the capacitor 106 (i.e., the voltage of the capacitor 106) detected by the voltage sensor 107 via the bus tie fuse 101n.

[0053] Note that the order of processing in the embodiment of the present disclosure may be changed as long as appropriate processing is performed.

[0054] Each of the storage units and storage devices (including registers and latches) in the embodiment of the present disclosure may be provided anywhere as long as appropriate information transmission and reception are performed. Further, a plurality of storage units and storage devices may exist and store data in a distributed manner as long as appropriate information transmission and reception are performed.

[0055] Although embodiments of the present disclosure have been described, the above-described charging system 1, DC microgrids 10a, 10b, upper device 80, control device 104, initial charging sequence 105, and other control devices may have a computer system inside. And, the processes described above are stored in a computer-readable recording medium in the form of a program, and the above processes are performed by the computer reading and executing this program. Specific examples of the computer are shown below.

[0056] FIG. 13 is a schematic block diagram showing the configuration of a computer according to at least one embodiment. As shown in FIG. 13, the computer 5 includes a CPU 6, a main memory 7, a storage 8, and an interface 9. For example, each of the above-described charging system 1, DC microgrids 10a, 10b, upper device 80, control device 104, initial charging sequence 105, and other control devices is implemented in the computer 5. And, the operations of the above-described respective processing units are stored in the storage 8 in the form of a program. The CPU 6 reads the program from the storage 8 and expands it in the main memory 7, and executes the above processes according to the program. Further, the CPU 6 secures a storage area corresponding to each of the above-described storage units in the main memory 7 according to the program.

[0057] Examples of the storage 8 include HDD (Hard Disk Drive), SSD (Solid State Drive), magnetic disk, magneto-optical disk, CD-ROM (Compact Disc Read Only Memory), DVD-ROM (Digital Versatile Disc Read Only Memory), semiconductor memory, and the like. The storage 8 may be an internal medium directly connected to the bus of the computer 5, or may be an external medium connected to the computer 5 via the interface 9 or a communication line. Further, when this program is distributed to the computer 5 via a communication line, the computer 5 that has received the distribution may expand the program in the main memory 7 and execute the above processing. In at least one embodiment, the storage 8 is a non-transitory tangible storage medium.

[0058] Also, the above program may implement a part of the functions described above. Further, the above program may be a file, so-called differential file (differential program), that can implement the above-described functions in combination with a program already recorded in the computer system.

[0059] Although some embodiments of the present disclosure have been described, these embodiments are examples and do not limit the scope of the disclosure. These embodiments may be subject to various additions, various omissions, various replacements, and various changes without departing from the gist of the disclosure.

[0060] <Appendix> The charging system 1, charging method, and program described in each embodiment of the present disclosure are understood as follows, for example.

[0061] (1) The charging system (1) according to the first aspect is connected to the positive electrode wiring (P) of the bus to which another DC microgrid (10b) to be coordinated is connected to the first terminal, and the first fuse (101p) to which the positive electrode wiring (P) of the bus to which a plurality of power converters (103) are connected via a plurality of fuses (102p) is connected to the second terminal, and The negative electrode wiring (N) of the busbar to which the other DC microgrid (10b) is connected is connected to the first terminal, and the second fuse (101n) to which the negative electrode wiring (N) of the busbar to which a plurality of power converters (103) are connected via a plurality of fuses (102n) is connected, and The first terminal is connected to the positive electrode wiring (P) of the busbar to which the other DC microgrid (10b) is connected, the second terminal is connected to the negative electrode wiring (N) of the busbar to which the other DC microgrid (10b) is connected, and a first capacitor (106) having a capacitance capable of cutting at least one of the first fuse (101p) and the second fuse (101n); is provided, Each of the plurality of power converters (103) A bridge circuit (103a) that generates AC power from DC power supplied by the positive electrode wiring (P) of the busbar to which the plurality of power converters (103) are connected and the negative electrode wiring (N) of the busbar to which the plurality of power converters (103) are connected; A second capacitor (103b) provided in parallel with the input terminals of the bridge circuit (103a) to smooth the DC power; A first switching element (103c3) provided between the positive electrode wiring (P) of the busbar to which the plurality of power converters (103) are connected and the bridge circuit (103a); A first path having a second switching element (103c2) provided in parallel with the first switching element (103c3) and a resistor (103c1) connected in series with the second switching element (103c2); is provided, A charging circuit (30) that is connected between both terminals of the second capacitor (103b) of at least one of the plurality of power converters (103) and charges the second capacitor (103b) when the first switching element (103c3) and the second switching element (103c2) are in an off state is further provided. is provided.

[0062] In this charging system (1), in the charging system (1), the first capacitor (106) is charged, enabling cooperation between the DC microgrid (10a) and the load (20a). Therefore, it is also possible to charge the capacitor (106) in the DC microgrid (10a) from the load (20a). As a result, it is possible to improve the charging of the capacitors (103b, 106) in the DC microgrid (10a) when the bus tie capacitor (106) is present.

[0063] (2) The charging system (1) according to the second aspect is the charging system (1) of (1), The first terminal and the second terminal of the first capacitor (106) may be connected via the second fuse (101n).

[0064] Thereby, the charging system (1) can improve the charging of the first capacitor (106) with various connections.

[0065] (3) The charging system (1) according to the third aspect is the charging system (1) of (1) or (2), When the charging of the second capacitor (103b) is completed, the load of the power converter (103) that charges the first capacitor (106) via the first path may be provided.

[0066] Thereby, the charging system (1) can improve the charging of the first capacitor (106).

[0067] (4) The charging system (1) according to the fourth aspect is the charging system (1) of (3), When the charging of the first capacitor (106) is completed, based on the control by the host device (80), the load may execute a predetermined process.

[0068] Thereby, the charging system (1) can immediately execute normal operation.

[0069] (5) The charging method according to the fifth aspect is Connected to the positive electrode wiring (P) of the bus to which another DC microgrid (10b) to be coordinated is connected to the first terminal, and connected to the positive electrode wiring (P) of the bus to which a plurality of power converters (103) are connected via a plurality of fuses (102p) to the second terminal. The first fuse (101p), and Connected to the negative electrode wiring (N) of the bus to which the other DC microgrid (10b) is connected to the first terminal, and connected to the negative electrode wiring (N) of the bus to which a plurality of power converters (103) are connected via a plurality of fuses (102n) to the second terminal. The second fuse (101n), and The first terminal is connected to the positive electrode wiring (P) of the bus to which the other DC microgrid (10b) is connected, the second terminal is connected to the negative electrode wiring (N) of the bus to which the other DC microgrid (10b) is connected, and at least one of the first fuse (101p) and the second fuse (101n) A first capacitor (106) having a cuttable capacitance, and Comprising Each of the plurality of power converters (103) A bridge circuit (103a) that generates AC power from DC power supplied by the positive electrode wiring (P) of the bus to which the plurality of power converters (103) are connected and the negative electrode wiring (N) of the bus to which the plurality of power converters (103) are connected, and A second capacitor (103b) provided in parallel with the input terminals of the bridge circuit (103a) to smooth the DC power, and A first switching element (103c3) provided between the positive electrode wiring (P) of the bus to which the plurality of power converters (103) are connected and the bridge circuit (103a), and A first path having a second switching element (103c2) provided in parallel with the first switching element (103c3), and a resistor (103c1) connected in series with the second switching element (103c2), and A charging system (1) comprising Connected between both terminals of at least one of the plurality of power converters (103), when the first switching element (103c3) and the second switching element (103c2) are in an off state, the second capacitor (103b) is charged.

[0070] In this control method, in the charging system (1), the first capacitor (106) is charged, and the DC microgrid (10a) and the load (20a) can be coordinated. Therefore, it is also possible to charge the capacitor (106) in the DC microgrid (10a) from the load (20a). As a result, the charging of the capacitors (103b, 106) in the DC microgrid (10a) when the bus tie capacitor (106) exists can be improved.

[0071] (6) The program according to the sixth aspect is Connected to the positive electrode wiring (P) of the bus to which another DC microgrid (10b) to be coordinated is connected to the first terminal, and connected to the positive electrode wiring (P) of the bus to which a plurality of power converters (103) are connected via a plurality of fuses (102p) to the second terminal. The first fuse (101p), Connected to the negative electrode wiring (N) of the bus to which the other DC microgrid (10b) is connected to the first terminal, and connected to the negative electrode wiring (N) of the bus to which a plurality of power converters (103) are connected via a plurality of fuses (102n) to the second terminal. The second fuse (101n), The first terminal is connected to the positive electrode wiring (P) of the bus to which the other DC microgrid (10b) is connected, the second terminal is connected to the negative electrode wiring (N) of the bus to which the other DC microgrid (10b) is connected, and at least one of the first fuse (101p) and the second fuse (101n) can be cut. The first capacitor (106) having capacitance, Comprising Each of the plurality of power converters (103) A bridge circuit (103a) that generates AC power from DC power supplied by a positive electrode wiring (P) of the bus to which the plurality of power converters (103) are connected and a negative electrode wiring (N) of the bus to which the plurality of power converters (103) are connected; A second capacitor (103b) provided in parallel with the input terminals of the bridge circuit (103a) for smoothing the DC power; A first switching element (103c3) provided between the positive electrode wiring (P) of the bus to which the plurality of power converters (103) are connected and the bridge circuit (103a); A first path having a second switching element (103c2) provided in parallel with the first switching element (103c3) and a resistor (103c1) connected in series with the second switching element (103c2); In a charging circuit (30) of a charging system (1) comprising: Connected between both terminals of at least one of the second capacitors (103b) of the plurality of power converters (103), and when the first switching element (103c3) and the second switching element (103c2) are in an off state, charging the second capacitor (103b). To execute.

[0072] In this program, in the charging system (1), the first capacitor (106) is charged, and the DC microgrid (10a) and the load (20a) can cooperate. Therefore, the load (20a) can also charge the capacitor (106) in the DC microgrid (10a). As a result, the charging of the capacitors (103b, 106) in the DC microgrid (10a) when the bus tie capacitor (106) exists can be improved.

Description of Reference Numerals

[0073] 1... Charging system 5... Computer 6... CPU 7... Main memory 8... Storage 9... Interface 10a, 10b... DC Microgrid 20a, 20b... Load 30... Charging Circuit 30b... Generator 30a, 30e... AC-AC Converter 30c, 30d, 60, 70, 103c2, 103c3, 202b2, 202b3, 203c... Switching Element 101p, 101n, 102p, 102n... Fuse 103... Power Converter 103a... Bridge Circuit 103b, 106... Capacitor 103c1, 202b1... Resistor

Claims

1. The positive electrode wiring of the busbar to which another DC microgrid to be coordinated is connected is connected to the first terminal, and the first fuse to which the positive electrode wiring of the busbar to which a plurality of power converters are connected via a plurality of fuses is connected is connected to the second terminal, and The negative electrode wiring of the busbar to which the other DC microgrid is connected is connected to the first terminal, and the second fuse to which the negative electrode wiring of the busbar to which a plurality of power converters are connected via a plurality of fuses is connected is connected to the second terminal, and The first terminal is connected to the positive electrode wiring of the busbar to which the other DC microgrid is connected, the second terminal is connected to the negative electrode wiring of the busbar to which the other DC microgrid is connected, and the first capacitor having a capacitance capable of cutting at least one of the first fuse and the second fuse, and Comprising, Each of the plurality of power converters, A bridge circuit that generates AC power from DC power supplied by the positive electrode wiring of the busbar to which the plurality of power converters are connected and the negative electrode wiring of the busbar to which the plurality of power converters are connected, and A second capacitor provided in parallel with the input terminals of the bridge circuit for smoothing the DC power, and A first switching element provided between the positive electrode wiring of the busbar to which the plurality of power converters are connected and the bridge circuit, and A first path provided in parallel with the first switching element and having a second switching element and a resistor connected in series with the second switching element, and Comprising, A charging circuit that is connected between both terminals of the second capacitor of at least one of the plurality of power converters and charges the second capacitor when the first switching element and the second switching element are in an off state, and A charging system comprising.

2. The first terminal and the second terminal of the first capacitor are Connected via the second fuse, The charging system according to claim 1.

3. When the charging of the second capacitor is completed, the load of the power converter that charges the first capacitor via the first path, The charging system according to claim 1 or claim 2 comprising.

4. When the charging of the first capacitor is completed, based on control by a host device, the load executes a predetermined process, The charging system according to claim 3.

5. The positive electrode wiring of the bus to which another DC microgrid to be coordinated is connected is connected to the first terminal, and the first fuse to which the positive electrode wiring of the bus to which a plurality of power converters are connected via a plurality of fuses is connected is connected to the second terminal, The negative electrode wiring of the bus to which the other DC microgrid is connected is connected to the first terminal, and the second fuse to which the negative electrode wiring of the bus to which a plurality of power converters are connected via a plurality of fuses is connected is connected to the second terminal, The first terminal is connected to the positive electrode wiring of the bus to which the other DC microgrid is connected, the second terminal is connected to the negative electrode wiring of the bus to which the other DC microgrid is connected, and the first capacitor having a capacitance capable of cutting at least one of the first fuse and the second fuse, is provided with, Each of the plurality of power converters, A bridge circuit that generates AC power from DC power supplied by the positive electrode wiring of the bus to which the plurality of power converters are connected and the negative electrode wiring of the bus to which the plurality of power converters are connected, A second capacitor provided in parallel with the input terminals of the bridge circuit for smoothing the DC power, A first switching element provided between the positive electrode wiring of the bus to which the plurality of power converters are connected and the bridge circuit, A first path provided in parallel with the first switching element and having a second switching element and a resistor connected in series to the second switching element, A charging system provided with, Connected between both terminals of the second capacitor of at least one of the plurality of power converters, when the first switching element and the second switching element are in an off state, charging the second capacitor Charging method.

6. The positive electrode wiring of the bus to which another DC microgrid to be coordinated is connected is connected to the first terminal, and the first fuse to which the positive electrode wiring of the bus to which a plurality of power converters are connected via a plurality of fuses is connected is connected to the second terminal, The negative electrode wiring of the bus to which the other DC microgrid is connected is connected to the first terminal, and the second fuse to which the negative electrode wiring of the bus to which a plurality of power converters are connected via a plurality of fuses is connected is connected to the second terminal, A first terminal is connected to the positive electrode wiring of the bus to which the other DC microgrid is connected, a second terminal is connected to the negative electrode wiring of the bus to which the other DC microgrid is connected, and a first capacitor having a capacitance capable of cutting at least one of the first fuse and the second fuse; comprising; each of the plurality of power converters; a bridge circuit that generates AC power from DC power supplied by the positive electrode wiring of the bus to which the plurality of power converters are connected and the negative electrode wiring of the bus to which the plurality of power converters are connected; a second capacitor provided in parallel with the input terminals of the bridge circuit for smoothing the DC power; a first switching element provided between the positive electrode wiring of the bus to which the plurality of power converters are connected and the bridge circuit; a first path provided in parallel with the first switching element and having a second switching element and a resistor connected in series with the second switching element; in a charging circuit of a charging system comprising; connected between both terminals of at least one of the second capacitors of the plurality of power converters, and charging the second capacitor when the first switching element and the second switching element are in an off state; a program for executing.

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