WO2024042595A1 - 直流送電システム、および直流送電方法 - Google Patents

直流送電システム、および直流送電方法 Download PDF

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Publication number
WO2024042595A1
WO2024042595A1 PCT/JP2022/031661 JP2022031661W WO2024042595A1 WO 2024042595 A1 WO2024042595 A1 WO 2024042595A1 JP 2022031661 W JP2022031661 W JP 2022031661W WO 2024042595 A1 WO2024042595 A1 WO 2024042595A1
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WIPO (PCT)
Prior art keywords
power
power transmission
transmission system
energy consumption
surplus
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PCT/JP2022/031661
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English (en)
French (fr)
Japanese (ja)
Inventor
慧 関口
裕史 児山
崇裕 石黒
Original Assignee
株式会社東芝
東芝エネルギーシステムズ株式会社
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Application filed by 株式会社東芝, 東芝エネルギーシステムズ株式会社 filed Critical 株式会社東芝
Priority to JP2024542464A priority Critical patent/JPWO2024042595A1/ja
Priority to PCT/JP2022/031661 priority patent/WO2024042595A1/ja
Publication of WO2024042595A1 publication Critical patent/WO2024042595A1/ja

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for DC mains or DC distribution networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers

Definitions

  • Embodiments of the present invention relate to a DC power transmission system and a DC power transmission method.
  • renewable energy power sources such as offshore wind power generation, which generates electricity using wind turbines installed on the sea.
  • Places suitable for installing renewable energy power sources are unevenly distributed and are far from places that consume large amounts of electricity. For this reason, attention is being focused on DC power transmission systems that are suitable for efficient long-distance transmission of power from renewable energy sources.
  • the scale of the AC system on the power transmission side is sufficiently larger than the scale of the renewable energy power supply equipment, so even if power fluctuations occur due to an accident in one of the DC power transmission systems, surplus power generation is possible. Electricity was absorbed by the AC system on the transmission side, and the balance between supply and demand of electricity was adjusted.
  • an energy consumption device is installed to absorb excess generated power in case an accident occurs in the receiving AC system.
  • the energy consuming device is connected to the DC side of a power converter placed on the receiving side of the generated power.
  • the problem to be solved by the present invention is to provide a DC power transmission system and a DC power transmission method that can suitably consume surplus power by an energy consumption device when power fluctuations occur due to an accident or the like. .
  • the DC power transmission system of the embodiment includes at least one DC power transmission line, a power transmission side power converter, a power reception side power converter, an energy consumption device, and a control device.
  • DC power lines transmit DC power.
  • the power transmission side power converter converts AC power supplied to the AC terminal by a renewable energy power source connected to the AC power transmission system on the power transmission side into DC power, and transmits the converted DC power from the DC terminal to the DC power. Output to electric wire.
  • the power receiving side power converter converts the DC power transmitted by the DC transmission line and input into the DC terminal into AC power, and transmits the converted AC power from the AC terminal to the power receiving side including the load connected to the power receiving side. supply to the AC power transmission system.
  • the energy consuming device is connected to a position between the AC power transmission system on the power transmission side and the DC transmission line, and the energy consumption device is configured to reduce the amount of the AC power supplied by the renewable energy power source in response to power fluctuations occurring in any of the components. When the power becomes surplus power, the surplus power is consumed.
  • a control device controls the operation of the energy consuming device.
  • FIG. 1 is a diagram showing an example of the configuration of a DC power transmission system according to a first embodiment.
  • FIG. 3 is a diagram for explaining an example of consumption of surplus power by a DC energy consumption device in the DC power transmission system of the first embodiment.
  • FIG. 7 is a diagram for explaining a first example of consumption of surplus power by an AC energy consumption device in a DC power transmission system according to a second embodiment.
  • FIG. 7 is a diagram for explaining a second example of consumption of surplus power by an AC energy consumption device in the DC power transmission system of the second embodiment.
  • FIG. 7 is a diagram for explaining an example of consumption of surplus power by a DC energy consumption device in a DC power transmission system according to a third embodiment.
  • FIG. 1 is a diagram showing an example of the configuration of a DC power transmission system according to the first embodiment.
  • three-phase AC power supplied from each of two renewable energy power sources (renewable energy power sources RE-A and RE-B) is converted into DC power and transmitted, and then the three-phase AC power is transmitted again.
  • An example of a two-terminal-to-two-terminal DC power transmission system 1 that converts into electric power and supplies it to two AC power transmission systems (AC power transmission systems TS-C and TS-D) is shown.
  • each of the renewable energy power source RE-A and the renewable energy power source RE-B is equipped with a wind power generator installed on the sea, and is a renewable energy source that supplies generated power (AC power). It is an energy power source.
  • the DC power transmission system 1 includes, for example, four AC current interrupting devices 10 (AC current interrupting devices 10-A, 10-B, 10-C, and 10-D) and four power converters 20 (power converters 20-D). -A, 20-B, 20-C, and 20-D), three DC transmission lines LN (DC transmission lines LN-AB, LN-AC, and LN-CD), and six DC current interrupting devices 30. (DC current interrupting devices 30-1 to 30-6) and a DC energy consuming device 40.
  • the DC power transmission system 1 shown in FIG. 1 shows an example of a configuration in which an AC power transmission system TS-B is arranged between a renewable energy power source RE-B and an AC current interrupting device 10-B.
  • FIG. 1 shows a host control device 100 as an example of a control device that controls each component that constitutes the DC power transmission system 1. As shown in FIG.
  • DC power transmission system 1 from the power transmission side of renewable energy power source RE-A and renewable energy power source RE-B, AC power transmission system TS-C and AC power transmission system TS-D are connected via DC power transmission line LN-AC. Power is transmitted to the power receiving side.
  • FIG. 1 shows the direction of power flow that is transmitted (supplied) from the power transmission side to the power reception side. More specifically, power from the renewable energy power source RE-A on the power transmission side is supplied to the DC power transmission line LN-AC side via the AC current interrupting device 10-A and the power converter 20-A, Power is transmitted to the receiving side via the DC transmission line LN-AC.
  • Electric power from the renewable energy power source RE-B on the power transmission side is supplied to the AC power transmission system TS-B, and from the AC power transmission system TS-B via the AC current interrupting device 10-B and the power converter 20-B.
  • the power is supplied to the DC power transmission line LN-AB side, further supplied to the DC power transmission line LN-AC, and then transmitted to the power receiving side by the DC power transmission line LN-AC.
  • the power transmitted by the DC power transmission line LN-AC is supplied to the power receiving side AC power transmission system TS-C via the power converter 20-C and the AC current interrupting device 10-C.
  • the electric power transmitted by the DC transmission line LN-AC is supplied to the DC transmission line LN-CD, and is further connected to the AC power transmission system TS-D on the power receiving side via the power converter 20-D and the AC current interrupting device 10-D. is supplied to
  • the system of the renewable energy power source RE-A on the power transmission side is also referred to as the "transmission side system A”, and the system of the renewable energy power source RE-B on the power transmission side is also referred to as the “power transmission side system B”.
  • the system of AC power transmission system TS-C on the power receiving side is also referred to as “power receiving system C”
  • the system of AC power transmission system TS-D on the power receiving side is also referred to as "power receiving system D”.
  • Each of the renewable energy power sources RE is a power generation facility that generates AC power using a windmill that rotates depending on the strength of the wind.
  • the renewable energy power source RE-A supplies the generated AC power to the AC current interrupting device 10-A.
  • the renewable energy power source RE-B supplies the generated AC power to the AC power transmission system TS-B.
  • Each of the renewable energy power source RE-A and the renewable energy power source RE-B is an example of a "renewable energy power source.”
  • the renewable energy power source RE-A is an example of a "first renewable energy power source” and the renewable energy power source RE-B is an example of a "second renewable energy power source.”
  • Each of the AC power transmission systems TS is a power transmission facility that transmits AC power.
  • Each of the AC power transmission systems TS transmits AC power supplied or transmitted to one end (input end) to the other end (output end).
  • the AC power transmission system TS-B transmits the AC power supplied by the renewable energy power source RE-B to the AC current interrupting device 10-B side.
  • the AC power generated by the renewable energy power source RE-B is supplied to the AC current interrupting device 10-B.
  • the AC power transmission system TS-B includes a power generation source such as a thermal power source other than the renewable energy power source RE-B, and loads of general consumers.
  • Each control device (not shown) of the AC power transmission system TS-B controls the total generated power of the renewable energy power source RE-B and the generated power of other power sources, the power consumed by the load, and the power converter.
  • the frequency of AC power is maintained at a constant value by balancing the total power transmitted from 20-B.
  • the AC power transmission system TS-C transmits AC power through the DC transmission line LN-AC and supplies the AC power by the power converter 20-C via the AC current interrupting device 10-C to the demand existing at the connected end. Transmits power to the house.
  • the AC power transmission system TS-D connects the AC power transmitted by the DC transmission line LN-AC and the DC transmission line LN-CD and supplied by the power converter 20-D via the AC current interrupting device 10-D.
  • Each of the AC power transmission system TS-C and the AC power transmission system TS-D is an example of "an AC power transmission system on the power receiving side that includes a load interconnected to the power receiving side.”
  • Each of the alternating current interrupting devices 10 interrupts the route where the accident occurred when a power fluctuation (hereinafter simply referred to as an "accident") occurs due to an accident or the like in a connected alternating current (AC power) route. It is a circuit breaker.
  • the alternating current interrupting device 10-A is connected to an alternating current transmission line between the renewable energy power source RE-A and the power converter 20-A, and during normal (steady) power transmission in the direct current transmission system 1, the alternating current interrupting device 10-A is AC power supplied by the energy power source RE-A is transmitted to the power converter 20-A.
  • the AC current interrupting device 10-A Electrically cut off (disconnect) the connection point (connection terminal) on the side where the accident occurred.
  • the AC current interrupting device 10-B is connected to the AC power transmission line between the AC power transmission system TS-B and the power converter 20-B, and during steady power transmission in the DC power transmission system 1, the AC current interrupting device 10-B is connected to the AC power transmission line between the AC power transmission system TS-B and the power converter 20-B.
  • AC power supplied by AC power transmission system TS-B and transmitted by AC power transmission system TS-B is transmitted to power converter 20-A.
  • the AC current interrupting device 10-B is configured to connect any one of the AC power transmission system TS-B (which may include the renewable energy power source RE-B), the power converter 20-B and its DC side, and the connected AC power transmission line. When an accident occurs in one or more, the connection terminal on the side where the accident occurred is electrically disconnected.
  • the AC current interrupting device 10-C is connected to an AC power transmission line between the power converter 20-C and the AC power transmission system TS-C, and during steady power transmission in the DC power transmission system 1, the AC current interrupting device 10-C is AC power is supplied by the AC power transmission system TS-C and transmitted to the AC transmission system TS-C.
  • the AC current interrupting device 10-C is designed to prevent an accident when an accident occurs in one or more of the power converter 20-C, its DC side, the AC transmission system TS-C, and the connected AC transmission lines. Electrically disconnect the connection terminal on the side where the problem occurred.
  • the AC current interrupting device 10-D is connected to an AC power transmission line between the power converter 20-D and the AC power transmission system TS-D. AC power supplied by the AC power transmission system TS-D is transmitted to the AC power transmission system TS-D.
  • the AC current interrupting device 10-D is designed to prevent an accident when an accident occurs in one or more of the power converter 20-D, its DC side, the AC transmission system TS-D, and the connected AC transmission lines. Electrically disconnect the connection terminal on the side where the problem occurred.
  • the interrupting operation in each of the alternating current interrupting devices 10 is performed, for example, under control from the host control device 100.
  • the interrupting operation in each of the alternating current interrupting devices 10 may be performed, for example, under control from a control device (not shown) disposed inside or near each alternating current interrupting device 10.
  • Each of the power converters 20 converts AC power (AC current) input into an AC terminal into DC power (DC current) and outputs the same to a DC terminal, or converts DC power input into a DC terminal into AC power.
  • This is an AC/DC converter that converts and outputs to the AC terminal.
  • Each of the power converters 20 is, for example, an alternating current/direct current (AC/DC) converter or a direct current/alternating current (DC/AC) converter.
  • a modular multilevel converter (MMC) having an arm in which a large number of unit converters each having a capacitor are connected in series is used.
  • the power converter 20-A converts the AC power supplied by the renewable energy power source RE-A and transmitted via the AC current interrupting device 10-A into DC power and supplies it to the DC power line LN-AC side. Output.
  • the power converter 20-B converts the AC power supplied by the renewable energy power source RE-B and transmitted via the AC power transmission system TS-B and the AC current interrupting device 10-B into DC power. Output to power transmission line LN-AB side.
  • the power converter 20-C converts the DC power transmitted from the DC power transmission line LN-AC side into AC power and outputs the AC power to the AC current interrupting device 10-C. As a result, the AC power converted by the power converter 20-C is transmitted (supplied) to the AC power transmission system TS-C.
  • the power converter 20-D converts the DC power transmitted from the DC power transmission line LN-CD side into AC power and outputs it to the AC current interrupting device 10-D. As a result, the AC power converted by the power converter 20-D is transmitted (supplied) to the AC power transmission system TS-D.
  • Each of power converter 20-A and power converter 20-B is an example of a "power transmission side power converter”.
  • the power converter 20-A is an example of a "first power transmitting power converter”
  • the power converter 20-B is an example of a "second power transmitting power converter.”
  • Each of power converter 20-C and power converter 20-D is an example of a "power receiving side power converter”.
  • Each of the DC current interrupting devices 30 is a circuit breaker that interrupts the route where the accident occurred when an accident occurs in the connected DC current (DC power) route.
  • the DC current interrupting device 30-1 is connected between the DC transmission line LN-AB and the DC transmission line LN-AC, and during steady power transmission in the DC power transmission system 1, the power is transmitted by the DC transmission line LN-AB. Transmits DC power to the DC transmission line LN-AC side.
  • the DC current interrupting device 30-1 is installed on the side where the accident occurred. Electrically disconnect the connecting terminals.
  • the DC current interrupting device 30-2 is connected between the power converter 20-B and the DC power transmission line LN-AB, and during steady power transmission in the DC power transmission system 1, the DC current interrupting device 30-2 is connected between the power converter 20-B and the DC power transmission line LN-AB.
  • the output DC power is transmitted to the DC transmission line LN-AB side.
  • the DC current interrupting device 30-2 electrically disconnects the connection terminal on the side where the accident occurred.
  • the DC current interrupting device 30-3 is connected between the power converter 20-A and the DC current interrupting device 30-1, and the DC power transmission line LN-AC.
  • the DC power output from the DC terminal of the converter 20-A and/or the DC power output from the DC terminal of the power converter 20-B is transmitted to the DC current interrupting device 30-2, the DC power transmission line LN-AB, and the DC current interrupting device.
  • the DC power transmitted through the device 30-1 is transmitted to the DC power transmission line LN-AC side.
  • the DC current interrupting device 30-3 electrically disconnects the connection terminal on the side where the accident occurred. Separate.
  • the DC current interrupting device 30-4 is connected between the DC power transmission line LN-AC, the power converter 20-C, and the DC current interrupting device 30-5.
  • the DC power transmitted by the power transmission line LN-AC is transmitted to the DC terminal of the power converter 20-C and/or to the DC power transmission line LN-CD side.
  • the DC current interrupting device 30-4 electrically disconnects the connection terminal on the side where the accident occurred. Separate.
  • the DC current interrupting device 30-5 is connected between the DC transmission line LN-AC and the DC transmission line LN-CD, and during steady power transmission in the DC power transmission system 1, power is transmitted by the DC transmission line LN-AC. Transmits DC power to the DC transmission line LN-CD side.
  • the DC current interrupting device 30-5 When an accident occurs in one or more of the DC transmission line LN-AC, the power converter 20-C, and the DC transmission line LN-CD, the DC current interrupting device 30-5 is connected to the side where the accident occurred. Electrically disconnect the connecting terminals.
  • the DC current interrupting device 30-6 is connected between the DC power transmission line LN-CD and the power converter 20-D.
  • the DC power transmitted by the LN-CD is transmitted to the DC terminal of the power converter 20-D.
  • the DC current interrupting device 30-6 electrically disconnects the connection terminal on the side where the accident occurred. Separate.
  • the interrupting operation in each of the DC current interrupting devices 30 is performed under control from the host controller 100, for example.
  • each of the DC current interrupting devices 30 may be performed, for example, under control from a control device (not shown) disposed inside or near each DC current interrupting device 30. Part or all of the DC current interrupting device 30 may be omitted depending on the configuration of the DC power transmission system 1, requirements for continuing operation in the event of an accident, and the like.
  • each renewable energy power source RE which is a power generation facility using wind power, has the inertia of the windmill, so even if an accident occurs on any of the routes that transmit power in the DC power transmission system 1, the accident that occurred will not occur. It is not possible to immediately stop the power generation operation depending on the situation. Therefore, if an accident occurs in any of the routes that transmit power in the DC power transmission system 1, each renewable energy The power generated by the power source RE due to the inertia (rotation) of the windmill may interfere with power transmission in the DC power transmission system 1. For example, the power supply and demand balance of the AC power transmission system TS on the power transmission side may collapse, and the frequency of AC power may fluctuate, leading to a large-scale power outage.
  • the DC energy consumption device 40 is an energy consumption device that consumes (absorbs) surplus DC power (surplus power) at a connected position.
  • the DC energy consumption device 40 connects the connection point on the power transmission side (that is, the connection point between the power transmission side system A and the power transmission side system B) that transmits DC power via the DC transmission line LN-AC, and Connected between electric wire LN and AC. More specifically, the DC energy consumption device 40 connects the DC terminal of the power converter 20-A and the connection terminal on the opposite side of the DC current interrupting device 30-1 to the side to which the DC power transmission line LN-AB is connected.
  • the DC energy consumption device 40 is a renewable energy power source RE-A or/and which becomes redundant when an accident occurs in one or more of the paths for supplying electric power via the DC transmission line LN-AC. And it is consumed by flowing DC power based on the AC power supplied from the renewable energy power source RE-B.
  • the DC energy consumption device 40 is, for example, a so-called DC chopper circuit including a semiconductor switch section and a resistor.
  • FIG. 1 shows a configuration of a semiconductor switch section and a resistor as an example of an equivalent circuit of a DC energy consuming device 40.
  • Control of the DC energy consumption device 40 to a state in which it consumes surplus power is performed when there is an abnormality in DC power (increase in DC voltage, increase in DC current, or decrease in these) or failure (increase in DC voltage, increase in DC current, or decrease in these) in the connected DC power transmission line. This is performed when a malfunction (such as a failure of the converter 20 or the AC power transmission system TS) is detected. More specifically, the semiconductor switch unit included in the DC energy consumption device 40 is controlled to either a closed state (on state) or an open state (off state) by, for example, control from the host control device 100. It will be done.
  • a control device (not shown) provided in the DC energy consumption device 40 controls the semiconductor switch unit included in the DC energy consumption device 40 to either the ON state or the OFF state. It may be performed based on the result of detecting an abnormality in DC power.
  • the control of the semiconductor switch unit included in the DC energy consumption device 40 to either the ON state or the OFF state is performed by, for example, a control (not shown) included in the DC energy consumption device 40 that operates in accordance with control from the host control device 100. This may be performed by a control device.
  • the semiconductor switch section may be controlled to be in either an on state or an off state.
  • the semiconductor switch unit included in the DC energy consumption device 40 is controlled to either the ON state or the OFF state by, for example, the DC current interrupting device 30-3, the DC current interrupting device 30-1, or the power converter 20-. It may be performed according to information from a control device (not shown) included in a component disposed inside or near the power converter 20-B.
  • the DC energy consumption device 40 is an example of an "energy consumption device.”
  • the DC energy consumption device 40 is an example of a “first energy consumption device”.
  • FIG. 2 is a diagram showing an example of the configuration of the DC energy consumption device 40 included in the DC power transmission system 1 of the first embodiment.
  • the DC energy consumption device 40 shown in FIG. 2 includes, for example, one or more (only two are shown in FIG. 2) semiconductor switch units SW (semiconductor switch unit SW-1) connected in series in the same direction. ⁇ SW-n (n is a natural number)) and a resistor R are connected in series.
  • the DC energy consumption device 40 allows or blocks DC current flowing from the DC terminal P to the DC terminal N.
  • Each of the semiconductor switch units SW includes, for example, a semiconductor switching element and a diode that are connected in parallel to each other. More specifically, in the semiconductor switch section SW, the cathode of the diode and the collector of the semiconductor switching element are connected to each other, and the anode of the diode and the emitter of the semiconductor switching element are connected to each other.
  • the gate of the semiconductor switching element is controlled (a control voltage is applied) based on a command from the host control device 100, for example. In other words, the semiconductor switch unit SW is controlled by the host control device 100 to either an on state (conducting state) or an off state (non-conducting state).
  • the semiconductor switching element is, for example, a switching element such as an insulated gate bipolar transistor (IGBT).
  • the semiconductor switching element is not limited to an IGBT, and may be any switching element as long as it is a semiconductor switching element that can realize self-extinguishing.
  • the resistor R allows the direct current flowing through each semiconductor switch section SW to flow to the direct current terminal N side.
  • the DC energy consumption device 40 can control the position of the DC power transmission line to which the DC terminal P is connected in accordance with the control of the semiconductor switch unit SW to either the ON state or the OFF state by the host control device 100.
  • the DC current flowing from the DC terminal P to the DC terminal N is allowed or blocked.
  • the DC terminal P of the DC energy consumption device 40 is connected to a DC power transmission line, and the DC terminal N is grounded. That is, in the DC energy consumption device 40, in each semiconductor switch part SW, the terminal on the side where the cathode of the diode and the collector of the semiconductor switching element are connected to each other is connected to the DC terminal P side (DC power transmission line side).
  • the terminal on the side where the anode of the diode and the emitter of the semiconductor switching element are connected to each other is connected to the DC terminal N side (resistor R side). Therefore, in the DC energy consumption device 40, when all the semiconductor switch units SW are controlled to be in the on state (each semiconductor switching element included in the semiconductor switch unit SW is in the on state), the resistor R is connected from the DC power transmission line side to the resistor R side. The excess power at the connected DC transmission line location is dissipated by allowing DC current to flow through the DC transmission line.
  • the average power consumption may be adjusted by repeatedly switching the semiconductor switch unit SW between the on state and the off state in a short time. good.
  • the DC energy consumption device 40 blocks the DC current flowing from the DC transmission line side to the resistor R side. It has no effect on the DC power at the wire location.
  • the configuration of DC energy consumption device 40 is not limited to the configuration shown in FIG. 2.
  • the DC energy consuming device 40 may be configured such that the circuits shown in FIG. 2 are arranged in parallel, and only some of the resistors R in the parallel configuration are controlled to be in a conductive state depending on the amount of surplus power. Good too.
  • the DC energy consumption device 40 may be configured by connecting in series a large number of unit converters each including a resistor and a semiconductor switching element that can switch the current path to the resistor, and convert the unit converter in series according to the amount of surplus power.
  • the resistor of the unit converter may be made conductive.
  • the number of semiconductor switch units SW connected in series in the DC energy consumption device 40 that is, the number of stages of semiconductor switch units SW, the withstand capacity (current capacity) of the semiconductor switching elements and diodes included in the semiconductor switch unit SW, and the withstand capacity of the resistor R. is determined according to the rated voltage of the DC power transmission system 1 and the surplus power consumed by the DC energy consumption device 40. More specifically, the number of stages of the semiconductor switch section SW is determined in consideration of the rated voltage of the DC power transmission system 1 and the withstand voltage of the semiconductor switching element and the diode, and the time during which surplus power is consumed in the DC energy consumption device 40 is determined.
  • the withstand capacity of the semiconductor switching element and the diode, and the withstand capacity of the resistor R are determined according to the amount of surplus power to be consumed.
  • the time period during which surplus power is consumed in the DC energy consumption device 40 is until the power supplied from the renewable energy power source RE is reduced in accordance with the control from the host control device 100 when an accident occurs in the DC power transmission system 1. (for example, several hundred [milliseconds] to 1 [second]).
  • the amount of surplus power consumed by the DC energy consumption device 40 is the amount of the corresponding DC power on the power transmission side.
  • the size is the sum of the power supplied from the power transmission side system A and the power transmission side system B.
  • the rated value of the surplus power consumed by the DC energy consumption device 40 is the rated value of the DC power based on the AC power supplied from the renewable energy power source RE-A, and the rated value of the DC power based on the AC power supplied from the renewable energy power source RE-B. This is the total value (total rated value) including the rated value of DC power based on AC power. More specifically, the rated value of the surplus power consumed by the DC energy consumption device 40 is the rated value of the DC power converted by the power converter 20-A and output to the DC terminal, and the rated value of the surplus power consumed by the power converter 20-B. This is the total rated value including the rated value of the DC power that is converted and output to the DC terminal.
  • the withstand capacity of the semiconductor switching element and the diode included in the DC energy consumption device 40 and the withstand capacity of the resistor R are, for example, limited to several hundreds [milliseconds] to 1 [second] when the power converter 20-A outputs
  • the power converter 20-B is determined to be able to consume power equal to the total rated value of the rated value of the DC power output by the power converter 20-B and the rated value of the DC power output by the power converter 20-B. For example, consider a case where the rated value of DC power output by power converter 20-A and the rated value of DC power output by power converter 20-B are the same magnitude.
  • the DC energy consuming device 40 is configured to control the rated value of the DC power output by the power converter 20-A or the rated value of the DC power output by the power converter 20-B for a period of, for example, several hundred [milliseconds] to 1 [second].
  • the withstand capacity of the semiconductor switching element and the diode and the withstand capacity of the resistor R are determined so that DC power twice the rated value of DC power can be consumed.
  • a margin may be given to the withstand capacity of the semiconductor switching element and the diode, and the withstand capacity of the resistor R determined here. For example, a margin of about 1.5 times the total rated value may be given to the withstand capacity of the semiconductor switching element and the diode, and the withstand capacity of the resistor R.
  • FIG. 3 is a diagram for explaining an example of consumption of surplus power by the DC energy consumption device 40 in the DC power transmission system 1 of the first embodiment.
  • Figure 3 shows accident F1 that occurred on DC transmission line LN-AC, accident F2 that occurred on power converter 20-C, accident F3 that occurred on AC transmission system TS-C, and accident F3 that occurred on DC transmission line LN-CD.
  • Accident F4 accident F5 that occurred in power converter 20-D, and accident F6 that occurred in AC power transmission system TS-D are shown as examples of accident F that may occur in DC power transmission system 1.
  • the accident F1 and the accident F4 are, for example, accidents of disconnection or ground fault of the DC power transmission line LN, and are accidents that can cause the DC power transmission line LN to be interrupted by the DC current interruption devices 30 at both ends.
  • Accident F2, accident F3, accident F5, and accident F6 are, for example, accidents that occur due to failure of each component.
  • the DC energy consumption device 40 is connected to a DC power transmission line to which the power converter 20-A, the DC current interrupting device 30-1, and the DC current interrupting device 30-3 are connected. ing. Therefore, when an accident occurs in one or more of the DC transmission line LN-AC, the power receiving system C, and the power receiving system D, the DC energy consumption device 40 is configured to operate the renewable energy power source RE-A or / and the power supplied from the renewable energy power source RE-B can be consumed (absorbed) as surplus power. In other words, the DC energy consumption device 40 detects that the power supplied from the renewable energy power source RE-A and/or the renewable energy power source RE-B becomes surplus power due to one or more of the accidents F1 to F6. Even if this happens, this surplus power can be consumed (absorbed).
  • the host controller 100 controls the power consumption in the DC power transmission system 1 by controlling each of the AC current interrupting device 10, the DC current interrupting device 30, and the DC energy consumption device 40 included in the DC power transmission system 1.
  • This is a management device that controls power transmission.
  • the host control device 100 may control power transmission in the DC power transmission system 1 by controlling each of the renewable energy power source RE, the power converter 20, and the AC power transmission system TS included in the DC power transmission system 1. .
  • the upper control device 100 realizes a control function that controls the operation of each component by a hardware processor such as a CPU (Central Processing Unit) executing a program (software). Some or all of the control functions of the host control device 100 are implemented using hardware such as LSI (Large Scale Integration), ASIC (Application Specific Integrated Circuit), FPGA (Field-Programmable Gate Array), and GPU (Graphics Processing Unit). It may be realized by a circuit unit (including a circuitry), or it may be realized by collaboration between software and hardware. Part or all of the control functions of the upper control device 100 may be realized by a dedicated LSI.
  • LSI Large Scale Integration
  • ASIC Application Specific Integrated Circuit
  • FPGA Field-Programmable Gate Array
  • GPU Graphics Processing Unit
  • the program (software) is stored in advance in a ROM (Read Only Memory), RAM (Random Access Memory), a semiconductor memory device such as a flash memory, or a storage device (HDD (Hard Disk Drive)) provided in the host control device 100. It may be stored in a storage device equipped with a non-transitory storage medium), or it may be stored in a removable storage medium (non-transitory storage medium) such as a DVD or CD-ROM. may be installed in a storage device included in the higher-level control device 100 by being attached to a drive device included in the higher-level control device 100 .
  • the host control device 100 detects whether an accident has occurred in each DC transmission line LN or component based on the DC voltage and/or AC voltage supplied to each DC transmission line LN or each component. do. For example, the host control device 100 detects an increase or decrease in voltage using a voltage detector (not shown) attached to each DC power transmission line LN or each component, and detects a voltage increase or decrease using a voltage detector (not shown). Based on the output detection value (voltage value) information, it is detected whether an accident has occurred.
  • the voltage detector detects a voltage at a position where it is installed, and outputs information representing a detected value (voltage value) of the detected voltage.
  • the voltage detector transmits information representing a detected voltage value (voltage value) to the inside of the AC current interrupting device 10, the DC current interrupting device 30, or the DC energy consuming device 40. Alternatively, it may be output to a nearby control device (not shown).
  • the configuration that detects voltage and outputs information representing the detected value (voltage value) is not limited to a voltage detector, and may be of any configuration.
  • the host control device 100 detects an increase in current using, for example, a current detector (not shown) attached to each DC power transmission line LN or each component, and It may be detected whether an accident has occurred based on the information of the output detection value (current value).
  • the upper control device 100 is an example of a "control device.”
  • the power supplied to the DC power transmission line LN-AC is supplied to the AC power transmission system TS-C via the DC current interruption device 30-4, the power converter 20-C, and the AC current interruption device 10-C. Further, the power supplied to the DC power transmission line LN-AC is supplied to the DC power transmission line LN-CD via the DC current interruption device 30-4 and the DC current interruption device 30-5, and then the DC current interruption device 30 -6, the power converter 20-D, and the AC current interrupting device 10-D to be supplied to the AC power transmission system TS-D.
  • the upper control device 100 performs the following procedure to Control is performed to shut down the power transmission line LN (hereinafter also referred to as "fault line”) and stop the operation of the component where the fault has occurred.
  • Step 1 First, when the host control device 100 detects that an accident has occurred in one or more of the DC power transmission line LN or its components, it controls the DC energy consumption device 40 to The surplus power (surplus power) flowing through the power transmission system 1 is consumed (absorbed). As a result, in the DC power transmission system 1, when an accident occurs, it is not possible to immediately stop the power generation operation by each renewable energy power source RE. AC power (surplus power) supplied from the renewable energy power source RE side becomes an excessive power supply to the connected AC transmission system TS, and the frequency of AC power increases abnormally, causing damage to the renewable energy power source RE and AC power transmission system. It is possible to prevent other power generation sources in the system TS from stopping or causing a power outage. Overcharging of the DC power transmission line LN and the capacitor of the power converter 20 can be prevented, and power transmission control can also be prevented from being stopped for a long time.
  • Step 2 Next, the host control device 100 connects the AC current interrupting device 10 (AC current interrupting device 10-C and AC current interrupting device 10-D) connected to the fault line, the DC current interrupting device 30 ( The DC current interrupting devices 30-3 to 30-6) are controlled to interrupt the faulty line. Further, the host control device 100 controls the components in which the accident has occurred, such as the power converter 20 (power converter 20-C and power converter 20-D), and stops the operation of each component. Steps 1 and 2 may be performed one after the other.
  • the power converter 20 power converter 20-C and power converter 20-D
  • Step 3 After that, the host control device 100 controls the renewable energy power source RE-A, the renewable energy power source RE-B, the AC power transmission system TS-B, the power converter 20-A, the power converter 20-B, etc. , control the components that supply power to the fault line or component in which the fault has occurred, and stop their respective operations.
  • the power generation operation of the renewable energy power source RE-A or the renewable energy power source RE-B may be stopped, or the power generation operation may be controlled to decrease without stopping the power generation operation. It's okay.
  • the host controller 100 controls the DC energy consuming device 40.
  • the consumption (absorption) of surplus power flowing through the DC power transmission system 1 is ended.
  • the DC energy consumption device 40 excessively consumes (absorbs) surplus power, and the power supplied from the renewable energy power source RE to the AC power transmission system TS becomes insufficient, resulting in It is possible to prevent a situation in which the frequency of power becomes low and other power generation power sources and renewable energy power sources RE in the AC power transmission system TS are stopped or a power outage occurs.
  • the host control device 100 performs control in response to an accident that occurs in the DC power transmission system 1.
  • the host controller 100 performs the following procedure to Performs control to restart power transmission via power transmission line LN-AC.
  • Step 4 When restarting power transmission by the DC power transmission line LN-AC, the host control device 100 first controls the AC current interrupting device 10 and the DC current interrupting device 30 to connect the fault line that was interrupted. (DC transmission line LN recovered from the accident) is connected.
  • Step 5 the host control device 100 checks the components that have stopped operating or reduced the generated power, such as the renewable energy power source RE-A, the renewable energy power source RE-B, and the power converter 20.
  • the components supplied with power via the DC power transmission line LN that have recovered from the accident are controlled to restart their respective operations.
  • the operation start of the power converter 20 in Steps 4 and 5 may be delayed.
  • the host control device 100 restarts the power transmission in the DC power transmission system 1, which had been stopped due to the occurrence of the accident.
  • the host control device 100 controls the transmission of power from the power transmission system A and/or the power transmission system B to the power reception system C and/or the power reception system D in the DC power transmission system 1.
  • the control of the operation of each component included in the DC power transmission system 1 is not limited to the control by the host control device 100, but can also be performed by a control device (not shown) disposed inside or near each component. It may be done by.
  • a control device (not shown) placed inside or near the components on the power transmission side detects an increase in the DC voltage on the power transmission side (power transmission system A and/or power transmission system B), and detects the It is possible to indirectly detect an accident that occurs on the side (power receiving side system C and/or power receiving side system D) or at a position close to the power receiving side.
  • DC power transmission system 1 the power transmission side of power transmission side system A and power transmission side system B is controlled by DC voltage, and the power receiving side of power receiving side system C and power receiving side system D is controlled by DC current (power). .
  • DC power transmission system 1 the power transmission side of power transmission side system A and power transmission side system B is controlled by DC current (power), and the power receiving side of power reception side system C and power reception side system D is controlled by DC voltage.
  • DC current power
  • DC voltage DC voltage
  • the DC voltage is further gradually increased by controlling the power converter 20 (power converter 20-A and power converter 20-B) on the power transmission side.
  • a control device (not shown) placed inside or near a component on the power transmission side can indirectly detect an accident that occurs on the power receiving side or at a location close to the power receiving side by detecting such a rise in DC voltage. can do.
  • a control device (not shown) placed inside or near the components on the power transmission side controls the power generated by the DC power transmission line LN and each component on the power receiving side, which are located far apart in the DC power transmission system 1.
  • the controlled components can be controlled to take action in response to the accident.
  • the DC power transmission system 1 even if the control devices (not shown) included in each component do not cooperate with each other by communicating with each other, the DC power transmission system 1 can be controlled, and a more reliable DC power transmission system can be operated.
  • DC energy is provided at the positions of the power converter 20-A, the power converter 20-B, and the DC power line connected to the DC power line LN-AC.
  • a consumer device 40 is connected.
  • the DC power transmission system 1 of the first embodiment in addition to the accident that can absorb surplus power in the conventional configuration in which a DC energy consumption device is connected to the power receiving side, the DC power transmission system 1 Surplus power generated due to the accident F1 etc. that occurred can also be consumed (absorbed) by the DC energy consumption device 40.
  • the DC power transmission system 1 of the first embodiment it is possible to suppress the influence of fluctuations occurring in the interconnected renewable energy power source RE and load.
  • one DC energy consumption is generated at the position of the DC transmission line connected to the DC transmission line LN-AC that is commonly used when supplying power from two renewable energy power sources.
  • Device 40 is connected. That is, in the DC power transmission system 1 of the first embodiment, one DC energy consumption device 40 is provided at a location where DC power supplied from each of the power transmission side system A and the power transmission side system B is collected (current collection location). is connected. As a result, in the DC power transmission system 1 of the first embodiment, the single DC energy consumption device 40 consumes (absorbs) surplus power from multiple power transmission systems that occurs due to power fluctuations due to accidents or the like. I can do it.
  • the total area for arranging the DC energy consuming devices 40 is smaller than arranging a plurality of DC energy consuming devices 40 corresponding to each power converter 20. can be made smaller, and the cost required for arranging the DC energy consuming device 40 can be reduced.
  • FIG. 4 is a diagram illustrating an example of the configuration of a DC power transmission system according to the second embodiment.
  • the DC power transmission system 2 of the second embodiment is also supplied from each of two renewable energy power sources (renewable energy power sources RE-A and RE-B).
  • RE-A and RE-B renewable energy power sources
  • a two-terminal system that converts three-phase AC power into DC power, transmits it, converts it back to three-phase AC power, and supplies it to two AC transmission systems (AC transmission systems TS-C and TS-D). It is a terminal DC power transmission system.
  • each of the renewable energy power source RE-A and the renewable energy power source RE-B is equipped with a wind power generator installed on the sea, and the generated power is It is a renewable energy power source that supplies (AC power).
  • the DC power transmission system 2 includes, for example, four AC current interrupting devices 10 (AC current interrupting devices 10-A, 10-B, 10-C, and 10-D) and four power converters 20 (power converters 20-D). -A, 20-B, 20-C, and 20-D), three DC transmission lines LN (DC transmission lines LN-AB, LN-AC, and LN-CD), and six DC current interrupting devices 30. (DC current interrupting devices 30-1 to 30-6), a DC energy consumption device 40, and an AC energy consumption device 50.
  • the DC power transmission system 2 shown in FIG. 4 also shows an example of a configuration in which the AC power transmission system TS-B is arranged between the renewable energy power source RE-B and the AC current interrupting device 10-B.
  • FIG. 4 also shows a higher-level control device 100 as an example of a control device that controls each component that constitutes the DC power transmission system 2.
  • a higher-level control device 100 As shown in FIG. 4, among the components included in the DC power transmission system 2, the same reference numerals are given to the components having the same functions as the components included in the DC power transmission system 1. Therefore, among the components included in the DC power transmission system 2, a detailed explanation will be omitted again regarding the components that have the same configuration and operation as the components included in the DC power transmission system 1, and only the different configurations and operations will be explained. .
  • the DC power transmission system 2 has a configuration in which an AC energy consumption device 50 is added to the DC power transmission system 1.
  • an AC energy consumption device 50 is added to the DC power transmission system 1.
  • the power generated by the renewable energy power source RE-B is transferred by the inertia of the wind turbine.
  • the AC energy consuming device 50 consumes (absorbs) it as surplus power.
  • the AC energy consumption device 50 is an energy consumption device that consumes (absorbs) surplus AC power (surplus power) at a connected position.
  • the AC energy consumption device 50 is connected to the power transmission side of the AC power supplied by the renewable energy power source RE-B (that is, the AC power transmission path in the power transmission side system B). More specifically, the AC energy consumption device 50 is connected to a position of the AC power transmission line between the output end of the AC power transmission system TS-B and the input side connection terminal of the AC current interrupting device 10-B. There is.
  • the AC energy consumption device 50 uses AC power supplied from the renewable energy power source RE-B that becomes surplus when an accident occurs in one or more of the routes for transmitting power in the DC power transmission system 2. Consume by flowing.
  • the AC energy consumption device 50 is, for example, a so-called AC chopper circuit including a semiconductor switch section and a resistor.
  • FIG. 4 shows a configuration of a semiconductor switch section and a resistor as an example of an equivalent circuit of the AC energy consuming device 50.
  • the AC energy consumption device 50 is controlled to consume surplus power when an abnormality in AC power (an increase in AC frequency or an increase in AC current) is detected in the connected AC power transmission line, or when the AC energy consumption device 50 is not connected. This is performed when an abnormality in DC power (an increase in DC voltage, an increase in DC current, or a decrease in these) or a failure (such as a failure in the power converter 20 or AC transmission system TS) is detected on the DC transmission line .
  • the semiconductor switch unit included in the AC energy consumption device 50 is controlled to either a closed state (on state) or an open state (off state) by, for example, control from the host control device 100. It will be done.
  • a control device (not shown) provided in the AC energy consumption device 50 controls the semiconductor switch unit included in the AC energy consumption device 50 to either the ON state or the OFF state. This may be done based on the result of detecting an abnormality in AC power or the like.
  • the control of the semiconductor switch unit included in the AC energy consumption device 50 to either the ON state or the OFF state is performed by, for example, a control (not shown) included in the AC energy consumption device 50 that operates in accordance with control from the host control device 100. This may be performed by a control device.
  • the unillustrated control device included in the AC energy consumption device 50 receives a signal (information) indicating that the occurrence of an accident has been detected, which is transmitted by the higher-level control device 100, the unillustrated control device
  • the semiconductor switch section may be controlled to be in either an on state or an off state.
  • the semiconductor switch unit included in the AC energy consumption device 50 is controlled to either the ON state or the OFF state, for example, by placing it inside or near the AC current interrupting device 10-B or the power converter 20-B. This may be performed according to information from a control device (not shown) included in the component.
  • the semiconductor switch unit included in the AC energy consuming device 50 is controlled to either the ON state or the OFF state by the DC current interrupting device 30 (DC current interrupting device 30-2, etc.) included in the DC power transmission system 2. This may be performed according to information from a control device (not shown) included in a component located inside or nearby.
  • the AC energy consumption device 50 is an example of an "energy consumption device.”
  • the AC energy consumption device 50 is an example of a “second energy consumption device”.
  • the AC energy consuming device 50 is connected to an AC power transmission line between the renewable energy power source RE-A and the connection terminal on the input side of the AC current interrupting device 10-A. It may be connected to the position.
  • the renewable energy power source RE-A when an accident occurs in one or more of the routes transmitting power in the DC power transmission system 2, the renewable energy power source RE-A generates electricity due to the inertia of the wind turbine. The generated power is consumed (absorbed) by the AC energy consumption device 50 as surplus power.
  • FIG. 5 is a diagram showing an example of the configuration of an AC energy consumption device 50 included in the DC power transmission system 2 of the second embodiment.
  • the AC energy consumption device 50 shown in FIG. 5 includes, for example, a series circuit in which one or more semiconductor switch units TSW (only one is shown in FIG. 5) and a resistor R are connected in series. This is a delta-connected configuration. That is, the AC energy consumption device 50 has a configuration in which series circuits of three-phase AC power (that is, three) are delta-connected.
  • each series circuit of the semiconductor switch unit TSW and the resistor R connects the AC terminals of the corresponding phases of the AC power transmission line (the AC terminals T-1 of the first phase, It is connected to the second phase AC terminal T-2 and the third phase AC terminal T-3).
  • the AC energy consumption device 50 allows or blocks AC current flowing between each phase of three-phase AC power.
  • Each of the semiconductor switch units TSW includes, for example, two thyristors connected in parallel in opposite directions. More specifically, in the semiconductor switch section TSW, the anode of one thyristor and the cathode of the other thyristor are connected to each other, and each connection point is a terminal of the semiconductor switch section TSW.
  • the gate of each thyristor is controlled (a control voltage is applied) based on a command from the host control device 100, for example.
  • the semiconductor switch unit TSW is controlled by the host control device 100 to either an on state (conducting state) or an off state (non-conducting state).
  • One terminal of the semiconductor switch section TSW is connected to the corresponding AC terminal T via the transformer TR, and the other terminal of the semiconductor switch section TSW is connected to one terminal of the resistor R.
  • the terminals are connected to the series circuit corresponding to the other phase and the AC terminal T of the other phase.
  • the resistor R causes the alternating current that has flowed to one terminal via each semiconductor switch unit TSW to flow to the other terminal side.
  • Each series circuit of the semiconductor switch unit TSW and the resistor R corresponds to each phase of three-phase AC power.
  • the series circuit of the semiconductor switch section TSW-1 and the resistor R-1 corresponds to the first and second phases of three-phase AC power
  • the series circuit of the semiconductor switch section TSW-1 and the resistor R-1 corresponds to the first and second phases of three-phase AC power
  • the series circuit with R-2 corresponds to the second and third phases of three-phase AC power
  • the series circuit with semiconductor switch part TSW-3 and resistor R-3 corresponds to the second and third phases of three-phase AC power. It corresponds to the third phase and the first phase.
  • the AC energy consuming device 50 can control the position of the AC power transmission line to which the AC terminal T is connected in accordance with the control of the semiconductor switch unit TSW to either the ON state or the OFF state by the host control device 100. Allow or block alternating current from flowing between the respective phases.
  • the AC energy consumption device 50 when all the semiconductor switch units TSW are in the on state (each thyristor included in the semiconductor switch unit TSW is controlled to be in the on state), AC current is allowed to flow between the respective phases in the AC power transmission line.
  • the surplus power at the position of the connected AC power transmission line is consumed.
  • the semiconductor switch unit TSW is switched between the on state and the off state for a short period of time.
  • the average power consumption may be adjusted by repeatedly switching the AC energy consumption device 50 to , by blocking the AC current flowing from the AC transmission line side to the resistor R side (other phase side), there is no effect on the AC power at the connected AC transmission line position.
  • AC energy The configuration of the consuming device 50 is not limited to the configuration shown in Fig. 5.
  • the AC energy consuming device 50 may have a configuration in which the circuits shown in Fig. 5 are arranged in parallel, and the parallel configuration may be changed depending on the amount of surplus power.
  • Some of the resistors R may be controlled to be conductive.
  • the number of semiconductor switch units TSW connected in series in the AC energy consumption device 50 that is, the number of stages of the semiconductor switch units TSW, the withstand capacity (current capacity) of the thyristor included in the semiconductor switch unit TSW, and the withstand capacity of the resistor R are determined by the transformer TR. It is determined according to the secondary side rated voltage of the AC energy consumption device 50 and the surplus power consumed by the AC energy consumption device 50. More specifically, the number of stages of the semiconductor switch unit TSW is determined in consideration of the secondary side rated voltage of the transformer TR and the withstand voltage of the thyristor, and the time and amount of surplus power consumed in the AC energy consumption device 50 are determined.
  • the withstand capacity of the thyristor and the withstand capacity of the resistor R are determined according to the magnitude of the surplus power.
  • the time period during which surplus power is consumed in the AC energy consumption device 50 is until the power supplied from the renewable energy power source RE is reduced in accordance with the control from the host control device 100 when an accident occurs in the DC power transmission system 2. (for example, several hundred [milliseconds] to 1 [second]).
  • the amount of surplus power consumed by the AC energy consuming device 50 is the amount of the corresponding AC power on the power transmission side.
  • the maximum rated value of surplus power consumed by the AC energy consumption device 50 corresponds to the rated value of the power converter 20-B based on the AC power supplied from the renewable energy power source RE-B.
  • the withstand capacity of the thyristor and the withstand capacity of the resistor R included in the AC energy consumption device 50 are limited to, for example, the AC supplied from the renewable energy power source RE-B for several hundred [milliseconds] to one [second]. It is determined that the amount equivalent to the rated value of the power converter 20-B can be consumed based on the electric power.
  • the withstand capacity of the thyristor and the withstand capacity of the resistor R determined here may have a margin.
  • the withstand capacity of the thyristor and the withstand capacity of the resistor R may have a margin of about 1.5 times the rated value.
  • FIG. 6 is a diagram for explaining a first example of consumption of surplus power by the AC energy consumption device 50 in the DC power transmission system 2 of the second embodiment.
  • Figure 6 shows accident F1 that occurred on DC transmission line LN-AC, accident F2 that occurred on power converter 20-C, accident F3 that occurred on AC transmission system TS-C, and accident F3 that occurred on DC transmission line LN-CD.
  • Accident F4 Accident F5 that occurred in power converter 20-D
  • Accident F6 that occurred in AC transmission system TS-D
  • Accident F7 that occurred in power converter 20-A
  • an accident F9 that occurred on the DC power transmission line LN-AB are shown as an example of an accident F that may occur in the DC power transmission system 2.
  • the AC energy consumption device 50 is connected to the AC power transmission line between the AC power transmission system TS-B and the AC current interrupting device 10-B. Therefore, when an accident occurs in any of the routes for transmitting power in the DC power transmission system 2, the AC energy consumption device 50 consumes the power supplied from the renewable energy power source RE-B as surplus power. (absorb). In other words, even if the power supplied from the renewable energy power source RE-B becomes surplus power due to any one or more of accidents F1 to F9, the AC energy consumption device 50 can use this surplus power. can be consumed (absorbed).
  • FIG. 6 shows the flow of power when the surplus power PS-B supplied from the renewable energy power source RE-B is consumed (absorbed).
  • the DC power transmission system 2 even if an accident occurs in one or more of the power transmission routes, the power supply and demand balance on the power transmission side (power transmission side system B) is maintained, and the power transmission side Power outages can be prevented.
  • the consumption (absorption) of surplus power PS-B by the AC energy consumption device 50 is not limited to the case where one or more of accidents F1 to F9 is detected.
  • the AC energy consuming device 50 may consume (absorb) surplus power PS-B.
  • Such an unplanned stoppage (unplanned cutoff state) of the AC current interrupting device 10 is also linked to a failure of a component of the DC power transmission system 2, so it can be done without significantly changing the conventional control device. Can be applied. Thereby, the DC power transmission system 2 can operate a more reliable DC power transmission system.
  • the operation of the higher-level control device 100 in this case may be equivalent to the operation of the higher-level control device 100 in the DC power transmission system 1 described above. Therefore, a detailed description of the operation of the host control device 100 that controls the first example of consumption of surplus power by the AC energy consumption device 50 will be omitted.
  • FIG. 7 is a diagram for explaining a second example of consumption of surplus power by the AC energy consumption device 50 in the DC power transmission system 2 of the second embodiment.
  • FIG. 7 shows a fluctuation F10 as an example of a fluctuation that may occur in the AC power transmission system TS-B.
  • the fluctuation F10 in the AC power transmission system TS-B can occur, for example, due to an increase in the power generated by the renewable energy power source RE-B due to the influence of the weather (depending on the weather).
  • the fluctuation F10 in the AC power transmission system TS-B can occur, for example, due to a sudden decrease in the power consumption of the load of a consumer connected to the AC power transmission system TS-B.
  • the fluctuation F10 in the AC power transmission system TS-B may also occur in a state where the influence of small power fluctuations is large, such as when the AC power transmission system TS-B is small-scale.
  • the AC energy consumption device 50 can consume (absorb) the power supplied from the renewable energy power source RE-B as surplus power when fluctuation F10 occurs in the DC power transmission system 2.
  • the AC energy consumption device 50 is controlled to consume surplus power, for example, when the host control device 100 detects an abnormality in which the power supply and demand balance in the AC power transmission system TS-B is disrupted. .
  • the host control device 100 detects an increase in the frequency of AC power in the AC power transmission system TS-B or acquires information regarding an increase in the generated power in the renewable energy power source RE-B
  • the AC energy consumption device 50 is controlled to a state in which surplus power is consumed.
  • the increase in the frequency of AC power of AC power transmission system TS-B means that the generated power of renewable energy power source RE-B and This occurs when the total generated power of the other power generation sources is large.
  • the disconnection of a load is, for example, a state in which a power transmission route is cut off due to an accident occurring in a component (not shown) that transmits AC power in the AC power transmission system TS-B.
  • FIG. 7 shows the flow of power when surplus power PS-B supplied from renewable energy power source RE-B is consumed (absorbed).
  • the DC power transmission system 2 can restore the power supply and demand imbalance in the AC power transmission system TS-B while continuing the power transmission in the DC power transmission system 2.
  • the operation of the higher-level control device 100 in this case can be easily considered based on the operation of the higher-level control device 100 in the DC power transmission system 1 described above. Therefore, a detailed description of the operation of the host control device 100 that controls the second example of consumption of surplus power by the AC energy consumption device 50 will be omitted.
  • the DC power transmission system 2 of the second embodiment in addition to the DC energy consumption device 40 included in the DC power transmission system 1 of the first embodiment, power is supplied from the renewable energy power source RE-B.
  • An AC energy consumption device 50 is connected to an AC power transmission line.
  • the power converter 20-B on the power transmission side Surplus power generated due to the accident F8 that occurred in the AC power transmission system TS-B or the fluctuation F10 in the AC power transmission system TS-B on the power transmission side can also be consumed (absorbed) by the AC energy consumption device 50.
  • the DC power transmission system 2 of the second embodiment it is possible to further suppress the influence of fluctuations occurring in the interconnected renewable energy power sources and loads.
  • the AC energy consumption device 50 has a configuration in which the series circuit in which the semiconductor switch unit TSW and the resistor R are connected in series is delta-connected.
  • the connection of the series circuit in the AC energy consumption device 50 is not limited to the delta connection.
  • the AC energy consumption device 50 may have a configuration in which series circuits are star-connected.
  • the AC energy consumption device 50 can consume (absorb) surplus power from the AC power transmission line.
  • FIG. 8 is a diagram illustrating an example of the configuration of a DC power transmission system according to the third embodiment.
  • the DC power transmission system 3 of the third embodiment also has two renewable energy power sources (renewable energy power sources RE-).
  • the three-phase AC power supplied from each of the two AC transmission systems AC transmission systems TS-C and RE-B
  • AC transmission systems TS-C and RE-B AC transmission systems TS-C and RE-B
  • each of the renewable energy power source RE-A and the renewable energy power source RE-B is equipped with a wind power generator installed on the sea, and the generated power is It is a renewable energy power source that supplies (AC power).
  • the DC power transmission system 3 includes, for example, four AC current interrupting devices 10 (AC current interrupting devices 10-A, 10-B, 10-C, and 10-D) and four power converters 20 (power converters 20 -A, 20-B, 20-C, and 20-D), three DC transmission lines LN (DC transmission lines LN-AB, LN-AC, and LN-CD), and six DC current interrupting devices 30. (DC current interrupting devices 30-1 to 30-6), three DC energy consuming devices 40 (DC energy consuming devices 40-1 to 40-3), and an AC energy consuming device 50.
  • the DC power transmission system 3 shown in FIG. 8 also shows an example of a configuration in which the AC power transmission system TS-B is arranged between the renewable energy power source RE-B and the AC current interrupting device 10-B.
  • FIG. 8 also shows a higher-level control device 100 as an example of a control device that controls each component that constitutes the DC power transmission system 3.
  • the same reference numerals are given to the components having the same functions as the components included in the DC power transmission system 1 and the DC power transmission system 2. Therefore, among the components included in the DC power transmission system 3, detailed explanations will be omitted again regarding the components that have the same configuration and operation as the components included in the DC power transmission system 1 and the DC power transmission system 2, and will not be explained in detail. I will only explain about.
  • FIG. 8 shows a configuration in which the DC energy consumption device 40 included in the DC power transmission system 2 includes a DC energy consumption device 40-2 and a DC energy consumption device 40-3 instead of the DC energy consumption device 40-1. ing.
  • the functions of the DC energy consumption devices 40 included in the DC power transmission system 1 and the DC power transmission system 2 are divided into a DC energy consumption device 40-1, a DC energy consumption device 40-2, and a DC energy consumption device 40-. This is realized by the configuration with 3.
  • the power generated by each renewable energy power source RE due to the inertia of the wind turbine The power is consumed (absorbed) as surplus power by a combination of a DC energy consumption device 40-1, a DC energy consumption device 40-2, and a DC energy consumption device 40-3.
  • Each of the DC energy consumption device 40-1, the DC energy consumption device 40-2, and the DC energy consumption device 40-3 is connected in the same manner as the DC energy consumption device 40 included in the DC power transmission system 1 and the DC power transmission system 2. This is an energy consumption device that consumes (absorbs) surplus DC power (surplus power) at a location where Each of the DC energy consumption device 40-1, the DC energy consumption device 40-2, and the DC energy consumption device 40-3 has the same configuration as the DC energy consumption device 40 (see FIG. 2). However, in each of the DC energy consumption device 40-1, the DC energy consumption device 40-2, and the DC energy consumption device 40-3, the withstand capacity of the semiconductor switching element and the diode and the withstand capacity of the resistor R are different from each other.
  • the withstand capacity of the semiconductor switching element and the diode provided in each of the DC energy consumption device 40-1, the DC energy consumption device 40-2, and the DC energy consumption device 40-3, and the withstand capacity of the resistor R are calculates the amount of time the surplus power is consumed and the amount of surplus power consumed when the DC energy consumption device 40-1, the DC energy consumption device 40-2, and the DC energy consumption device 40-3 are combined. determined to be satisfied.
  • the withstand capacity of the semiconductor switching element and the diode provided in each of the DC energy consumption device 40-1, the DC energy consumption device 40-2, and the DC energy consumption device 40-3, and the withstand capacity of the resistor R are, for example, The total rated value of the rated value of the DC power output by the power converter 20-A and the rated value of the DC power outputted by the power converter 20-B for a period of several hundred milliseconds to 1 second. It is determined that the amount of power can be consumed. Excess power is consumed in a combination of the DC energy consumption device 40-1, the DC energy consumption device 40-2, and the DC energy consumption device 40-3.
  • the withstand capacity of the semiconductor switching element and the diode, and the withstand capacity of the resistor R are determined by the total rating. It can be smaller than the value.
  • the DC energy consumption device 40 provided in the DC power transmission system 1 or the DC power transmission system 2, and any one of the DC energy consumption device 40-1, the DC energy consumption device 40-2, or the DC energy consumption device 40-3.
  • the rated value of the surplus power to be consumed can be made smaller than the rated value of the surplus power to be consumed in the DC energy consumption device 40.
  • the fact that the rated value of the surplus power to be consumed can be reduced means that the DC energy consumption device 40-1, the DC energy consumption device 40-2, and the DC energy consumption device 40-3 can be downsized. It is. This is useful when it is impossible to secure an area for arranging the DC energy consumption device 40 in the DC power transmission system 1 or the DC power transmission system 2.
  • Each of the DC energy consumption device 40-1, the DC energy consumption device 40-2, and the DC energy consumption device 40-3 is an example of an "energy consumption device.”
  • the DC energy consumption device 40-1 is an example of a “first energy consumption device”.
  • Each of the DC energy consumption device 40-2 and the DC energy consumption device 40-3 is an example of a "third energy consumption device.”
  • FIG. 9 shows the consumption of surplus power by the DC energy consumption devices (DC energy consumption device 40-1, DC energy consumption device 40-2, and DC energy consumption device 40-3) in the DC power transmission system 3 of the third embodiment.
  • FIG. 3 is a diagram for explaining an example.
  • Figure 9 shows accident F1 that occurred on DC transmission line LN-AC, accident F2 that occurred on power converter 20-C, accident F3 that occurred on AC transmission system TS-C, and accident F3 that occurred on DC transmission line LN-CD.
  • Accident F4 accident F5 that occurred in power converter 20-D, and accident F6 that occurred in AC power transmission system TS-D are shown as examples of accident F that may occur in DC power transmission system 3.
  • the DC energy consumption device 40-1 connects the DC terminal of the power converter 20-A to the side opposite to the side to which the DC power transmission line LN-AB is connected in the DC current interrupting device 30-1. At the position of the DC power transmission line where the connection point to which each connection terminal is connected and the connection terminal on the side opposite to the side to which the DC power transmission line LN-AC is connected in the DC current interrupting device 30-3 are connected. It is connected.
  • the DC energy consuming device 40-2 connects the connection terminal of the DC current interrupting device 30-4 on the opposite side to the side to which the DC power transmission line LN-AC is connected, and the DC current interrupting device.
  • the DC energy consumption device 40-1, the DC energy consumption device 40-2, and the DC energy consumption device 40-3 are connected to the DC power transmission line LN-AC, the power receiving system C , and when an accident occurs in one or more of the power receiving system D, the power supplied from the renewable energy power source RE-A and/or the renewable energy power source RE-B is consumed as surplus power ( absorption).
  • the DC power transmission system 3 depending on the configuration in which the DC energy consumption device 40-1, the DC energy consumption device 40-2, and the DC energy consumption device 40-3 are combined, one of the accidents F1 to F6 can occur. Alternatively, even if the power supplied from renewable energy power source RE-A and/or renewable energy power source RE-B becomes surplus power due to multiple accidents, this surplus power can be consumed (absorbed). .
  • surplus power PS-A supplied from the renewable energy power source RE-A and surplus power PS-B supplied from the renewable energy power source RE-B are connected to a DC energy consumption device 40- 1, the DC energy consuming device 40-2, and the DC energy consuming device 40-3, respectively.
  • the DC power transmission line LN-AC and the power receiving side similarly to the DC power transmission system 1 and the DC power transmission system 2, the DC power transmission line LN-AC and the power receiving side (power receiving side system C and power receiving side system Even if an accident occurs in one or more of D), the power supply and demand balance on the power transmission side (power transmission side system A and power transmission side system B) can be maintained and a power outage on the power transmission side can be prevented.
  • the DC power transmission system 3 can also operate a more reliable DC power transmission system like the DC power transmission system 1 and the DC power transmission system 2.
  • the DC energy consumption device 40-1 and the DC energy consumption device 40-2 are used in response to an accident F1 occurring on the DC transmission line LN-AC or an accident F4 occurring on the DC transmission line LN-CD. Even if all of the DC energy consuming devices 40-3 and 40-3 do not absorb surplus power, each DC energy consuming device 40 absorbs as much surplus power as possible, so that the power transmission side (power transmission side system A and It is possible to improve the power supply and demand balance in the side system B).
  • the operation of the higher-level control device 100 in this case may be equivalent to the operation of the higher-level control device 100 in the DC power transmission system 1 described above. Therefore, a detailed description of the operation of the host control device 100 that controls the example of consumption of surplus power by the DC energy consumption device 40-1, the DC energy consumption device 40-2, and the DC energy consumption device 40-3 will be omitted.
  • the DC energy consumption device 40 is replaced with the DC energy consumption device 40-1, and a DC energy consumption device 40-2 and a DC energy consumption device 40-3 are added. . Therefore, in the DC power transmission system 3 as well, surplus power can be consumed (absorbed) by the AC energy consumption device 50, similarly to the DC power transmission system 2.
  • DC energy consumption device 40 included in the DC power transmission system 1 of the first embodiment or the DC power transmission system 2 of the second embodiment, a DC energy consumption device 40-1, a DC energy consumption device 40-2, and a DC energy consumption device 40-3.
  • the DC power transmission system 1 of the first embodiment and the DC power transmission system of the second embodiment are combined by the DC energy consumption devices 40-1 to 40-3. Similar to System 2, it is possible to consume (absorb) surplus power (DC power) from multiple power transmission systems that occurs due to power fluctuations due to accidents or the like.
  • the DC power transmission system 3 includes an AC energy consumption device 50 similarly to the DC power transmission system 2 of the second embodiment.
  • the surplus power (AC power) of the AC power transmission line is consumed (absorbed) by the AC energy consumption device 50, similarly to the DC power transmission system 2 of the second embodiment. )can do.
  • the DC power transmission system 3 of the third embodiment as in the DC power transmission system 2 of the second embodiment, it is possible to suppress the influence of fluctuations occurring in the interconnected renewable energy power sources and loads. I can do it.
  • the DC energy consumption device 40 has a configuration in which a DC energy consumption device 40-2 and a DC energy consumption device 40-3 are added instead of the DC energy consumption device 40-1. Although shown, the configuration of the DC power transmission system 1 may be similarly replaced.
  • the DC power transmission system of the embodiment includes an energy consumption device (DC energy consumption device 40 or AC energy consumption device 50) for consuming (absorbing) surplus power.
  • the host control device 100 and/or a control device (not shown) disposed inside or near each of the components is connected to any one of the DC power transmission systems transmitting power. Detect accidents that occur on one or more routes.
  • the surplus power DC power or AC power
  • the surplus power is consumed (absorbed) by the corresponding energy consumption device.
  • the host control device 100 and/or a control device (not shown) disposed inside or near each component interrupts the route (fault line) where the accident occurred, After stopping the operation of the component in which the accident has occurred, stop the operation (or reduce the generated power) of the renewable energy power source RE that supplies power to the fault line or the component in which the accident has occurred. At the same time (synchronized with the stoppage of operation or reduction in generated power of the renewable energy power source RE that supplies power to the faulty line or the component in which the fault has occurred), the consumption (absorption) of surplus power by the energy consuming device. terminate.
  • surplus power can be suitably consumed (absorbed) by the energy consumption device, and the balance of supply and demand of power in the renewable energy power source RE on the power transmission side can be maintained.
  • the DC power transmission system of the embodiment it is possible to prevent power outages due to the stoppage of the renewable energy power source RE and other power generation sources on the power transmission side, and it is possible to operate the DC power transmission system with higher reliability. can.
  • the upper control device 100 detects an accident that occurs in one or more routes transmitting power.
  • the case where each component is controlled by detecting (power fluctuation) has been explained.
  • the configuration for detecting accidents (power fluctuations) and controlling each component in the DC power transmission system 1 is a control device (not shown) placed inside or near each component. It's okay.
  • the host control device 100 and a control device (not shown) placed inside or near each component cooperate to detect accidents (power fluctuations) and may be controlled.
  • both the host control device 100 and a control device monitor whether an accident (power fluctuation) has occurred in each route through which power is being transmitted, and both ) may be detected (if both detection results are the same), each component may be controlled.
  • both the host control device 100 and a control device monitor whether an accident (power fluctuation) has occurred in each route through which power is being transmitted, and detect the occurrence of an accident (power fluctuation) as soon as possible.
  • the respective components may be controlled depending on the detection result of either one of them.
  • the renewable energy power source RE generates power (AC power) generated by a wind power generator installed on the sea.
  • the renewable energy power source RE is not limited to wind power generation equipment.
  • the renewable energy power source RE may be other types of renewable energy power generation equipment, such as thermal power generation equipment, solar power generation equipment, geothermal power generation equipment, etc., for example.
  • the DC power transmission system 1 may transmit power using components corresponding to each renewable energy power generation facility.
  • the solar power generation equipment when the DC power transmission system 1 has a configuration compatible with solar power generation equipment, the solar power generation equipment generates DC power.
  • the solar power generation equipment is equipped with another power converter that converts DC power into AC power, and can be interconnected to the DC power transmission system 1. Therefore, the DC power transmission system 1 can have a configuration equivalent to the DC power transmission system 1 described above.
  • the DC power transmission system 1 (including the DC power transmission system 2 and the DC power transmission system 3) of the embodiment described above, there are two renewable energy power sources RE-A and RE-B.
  • the number of renewable energy power sources RE and the number of AC power transmission systems TS connected to the DC power transmission system 1, that is, the number of terminals of the DC power transmission system 1, is not limited to two terminals.
  • the number of terminals on the power transmission side or the power reception side of the DC power transmission system 1 may be one terminal, or three or more terminals.
  • the control of the DC power transmission system 1 in these cases is controlled by the DC power transmission system 1 (DC power transmission system) described above. 2, DC power transmission system 3)).
  • At least one DC transmission line that transmits DC power and a renewable energy power source (RE-A, RE- B) converts the AC power supplied to the AC terminal into DC power and outputs the converted DC power from the DC terminal to the DC transmission line;
  • the DC power transmitted through electric wires and input to the DC terminals is converted into AC power, and the converted AC power is then connected to the AC transmission system (TS-C, TS -D), and the power generated in any component connected to the position between the power receiving side power converter (20-C, 20-D) and the transmitting side AC transmission system and DC transmission line.
  • An energy consumption device (40) that consumes surplus power when AC power supplied by a renewable energy power source becomes surplus power due to fluctuations; and a control device (100) that controls the operation of the energy consumption device.

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PCT/JP2022/031661 2022-08-23 2022-08-23 直流送電システム、および直流送電方法 WO2024042595A1 (ja)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2270331A2 (en) * 2009-06-30 2011-01-05 Vestas Wind Systems A/S Wind turbine with control means to manage power during grid faults
JP2014128159A (ja) * 2012-12-27 2014-07-07 Mitsubishi Heavy Ind Ltd 発電施設及びその運転方法、並びに発電施設の制御装置
WO2014136229A1 (ja) * 2013-03-06 2014-09-12 三菱電機株式会社 電力変換装置
JP2015515245A (ja) * 2012-03-01 2015-05-21 アルストム テクノロジー リミテッドＡＬＳＴＯＭ Ｔｅｃｈｎｏｌｏｇｙ Ｌｔｄ 制御回路
JP2019500847A (ja) * 2015-12-30 2019-01-10 オープンハイドロ アイピー リミテッド 直列に接続された整流器を備える交流発電機群

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2270331A2 (en) * 2009-06-30 2011-01-05 Vestas Wind Systems A/S Wind turbine with control means to manage power during grid faults
JP2015515245A (ja) * 2012-03-01 2015-05-21 アルストム テクノロジー リミテッドＡＬＳＴＯＭ Ｔｅｃｈｎｏｌｏｇｙ Ｌｔｄ 制御回路
JP2014128159A (ja) * 2012-12-27 2014-07-07 Mitsubishi Heavy Ind Ltd 発電施設及びその運転方法、並びに発電施設の制御装置
WO2014136229A1 (ja) * 2013-03-06 2014-09-12 三菱電機株式会社 電力変換装置
JP2019500847A (ja) * 2015-12-30 2019-01-10 オープンハイドロ アイピー リミテッド 直列に接続された整流器を備える交流発電機群

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