WO2022190731A1 - 電力供給装置、電力供給方法 - Google Patents

電力供給装置、電力供給方法 Download PDF

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Publication number
WO2022190731A1
WO2022190731A1 PCT/JP2022/004449 JP2022004449W WO2022190731A1 WO 2022190731 A1 WO2022190731 A1 WO 2022190731A1 JP 2022004449 W JP2022004449 W JP 2022004449W WO 2022190731 A1 WO2022190731 A1 WO 2022190731A1
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WO
WIPO (PCT)
Prior art keywords
power supply
power
temporary
voltage
supply device
Prior art date
Application number
PCT/JP2022/004449
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English (en)
French (fr)
Japanese (ja)
Inventor
孝平 久保
Original Assignee
住友重機械工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority to JP2023505219A priority Critical patent/JPWO2022190731A1/ja
Publication of WO2022190731A1 publication Critical patent/WO2022190731A1/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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
    • 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
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems

Definitions

  • the present invention relates to technology for supplying temporary power to a power supply target.
  • Patent Document 1 discloses a power supply device for a server that switches to a secondary battery as an emergency power supply when the commercial power supply fails.
  • the secondary battery is normally charged with power from a commercial power supply that has been stepped down by a step-down DC/DC converter, and in the event of a power outage, a step-up DC/DC converter boosts the power to the same voltage as the commercial power supply and supplies it to the server. supply.
  • the present invention has been made in view of this situation, and its purpose is to provide a power supply device capable of stably supplying temporary power.
  • a power supply device is a power supply device that supplies temporary power to a power supply target, and detects disconnection of the power supply target from a normal power source.
  • a detection unit and a temporary power supply unit that supplies temporary power having a voltage higher than that of a normal power supply to a power supply target in response to detection of disconnection.
  • the temporary power having a voltage higher than that of the normal power source is supplied to the power supply target, even if the load of the power supply target fluctuates significantly, the possibility of exceeding the power supply capacity of the power supply device is low. Become. Therefore, it is possible to stably supply temporary power to a power supply target whose load fluctuates greatly.
  • This method is a power supply method for temporarily supplying power to a power supply target, and includes a disconnection detection step of detecting disconnection from a normal power source of the power supply target, and a temporary power supply step of supplying temporary power with a high voltage to a power supply target.
  • FIG. 1 is a cross-sectional view schematically showing the configuration of a coke oven in which a power supply device is used;
  • FIG. It is a functional block diagram of a power supply device.
  • FIG. 4 is a diagram schematically showing the effect of making the voltage of temporary power higher than that of the commercial power supply;
  • FIG. 4 is a diagram showing the results of tests conducted using an actual charging vehicle.
  • 1 is a diagram schematically showing a configuration of an electric vehicle in which a power supply device is used; FIG.
  • the power supply device of the present invention can be used for temporary power supply to any power supply target. Therefore, the power supply object is not particularly limited, but in the present embodiment, an example in which power is supplied to a charging car in a coke oven will be described first. Other examples of power supply targets will be described later.
  • FIG. 1 is a cross-sectional view schematically showing the configuration of a coke oven 1 in which the power supply device of this embodiment is used.
  • the up-down direction in the drawing is the vertical direction, and the left-right direction in the drawing is the horizontal direction.
  • the coke oven 1 is an oven that produces coke by carbonization of coal.
  • Coal as a raw material is charged from the upper coal tower 10 into the coking chamber 30 through the coal charging car 20 .
  • Coal is dry-distilled in the carbonization chamber 30 to become coke, which is pushed out of the carbonization chamber 30 in the left-right direction by an extrusion device (not shown).
  • a plurality of carbonization chambers 30 are provided side by side in a direction perpendicular to the paper surface.
  • the coal tower 10 has a coal tank 12 containing coal as a raw material.
  • a conveyor 14 for carrying coal is provided above the coal tank 12 , and the coal is thrown into the coal tank 12 from the conveyor 14 .
  • a plurality of outlets 16 are arranged side by side in the left-right direction at the bottom of the coal tank 12 .
  • Each outlet 16 is bounded by a partition 18 and coal is guided to each outlet 16 by sliding down the sloped sidewalls of each partition 18 .
  • a coal charging car 20 provided between the coal tower 10 and the plurality of coking chambers 30 is movably provided along a pair of rails 22 laid in a direction perpendicular to the plane of the paper, and feeds coal charged from the coal tower 10. It is transported to each carbonization chamber 30 and charged.
  • FIG. 1 shows the coking chamber 30 positioned immediately below the coal tower 10, the two are actually separated in the direction perpendicular to the plane of the paper.
  • the coal charging car 20 moves cyclically between the coal tower 10 and the plurality of coking chambers 30 to repeatedly transport coal from the coal tower 10 and charge coal into each coking chamber 30 .
  • each cutting device 26 provided below each charging hopper 24 cuts coal, corresponding to each cutting device 26 on the upper surface of each coking chamber 30. It is charged (charging) into each carbonization chamber 30 through each charging hole 32 provided at a position where the coal is charged. After the coal is carbonized in each carbonization chamber 30 and turned into coke, it is taken out of the carbonization chamber 30 by an extrusion device. Note that the coal charging into a plurality of coking chambers 30 may be performed simultaneously by a plurality of sets of charging hoppers 24 and discharging devices 26 .
  • FIG. 2 is a functional block diagram of the power supply device 100 of this embodiment that supplies power to the coal charging car 20.
  • the power supply device 100 includes a converter 120 that rectifies three-phase AC power supplied from a commercial power source 110 as a normal power source and converts it into DC power (pulsating current), and a converter 120 that smoothes the DC power converted by the converter 120. and an inverter 140 for converting the DC power smoothed by the capacitor 130 into AC power.
  • the converter 120 includes diodes 121 to 126 that rectify the three-phase (U, V, W) AC power supplied from the commercial power supply 110 in a certain direction (upward direction in the figure).
  • Diode 121 allows current to flow when the U-phase AC voltage is positive
  • diode 122 allows current to flow when the U-phase AC voltage is negative
  • diode 123 allows current to flow when the V-phase AC voltage is positive
  • diode 124 allows current to flow when the U-phase AC voltage is positive.
  • diode 125 conducts current when the W-phase AC voltage is positive
  • diode 126 conducts current when the W-phase AC voltage is negative.
  • VDC the DC voltage input between high potential input terminal 141 and low potential input terminal 142 of inverter 140 via converter 120 and capacitor 130 .
  • V DC V dd -V ss .
  • Inverter 140 generates three-phase AC power based on DC voltage VDC input between high potential input terminal 141 and low potential input terminal 142 .
  • a U-phase inverter 140U that generates U-phase AC power based on the DC voltage VDC
  • a V-phase inverter 140V that generates V-phase AC power based on the DC voltage VDC
  • a DC voltage V A W-phase inverter 140W that generates W-phase AC power based on DC is provided in parallel. Since the configurations of the inverters 140U, 140V, and 140W for each phase are common, they will be collectively referred to as the inverter 140 as appropriate below.
  • the inverter 140 has a high potential input terminal 141 to which a high DC power supply potential Vdd is input, a low potential input terminal 142 to which a low DC power supply potential Vss is input, and a high potential input terminal 141 and a low potential input terminal 142.
  • An output terminal 143 is provided therebetween for outputting an alternating voltage that varies between Vdd and Vss .
  • a high potential transistor 144H is connected between the high potential input terminal 141 and the output terminal 143, and a low potential transistor 144L is connected between the low potential input terminal 142 and the output terminal 143.
  • the high potential transistor 144H is switched between conductive states in response to a control signal from a high potential driver 145H connected to its control electrode.
  • the low potential transistor 144L is switched between conductive states according to a control signal from a low potential driver 145L connected to its control electrode.
  • a driver pair 145 consisting of a high-potential driver 145H and a low-potential driver 145L performs switching control to complementarily switch the conductive state of a transistor pair 144 consisting of a high-potential transistor 144H and a low-potential transistor 144L, thereby providing direct current. Converts electrical power to AC power.
  • "complementary switching" means that the on/off states of the transistors 144H and 144L are controlled to be opposite to each other. That is, when the transistor 144H is on, the transistor 144L is turned off, and when the transistor 144H is off, the transistor 144L is turned on.
  • a high potential Vdd appears at the output terminal 143 when the high potential transistor 144H is on, and a low potential Vss appears at the output terminal 143 when the low potential transistor 144L is on.
  • a high potential Vdd and a low potential Vss appear alternately at the output terminal 143, thereby generating AC power.
  • the three-phase AC power generated by the inverter 140 is supplied to a motor 200 that rotates the wheels 23 provided on the rails 22 of the car 20, for example.
  • the motor 200 is a three-phase brushless motor having three-phase coils 200U, 200V, and 200W of U-phase, V-phase, and W-phase.
  • U-phase current from U-phase inverter 140U flows through U-phase coil 200U
  • V-phase current from V-phase inverter 140V flows through V-phase coil 200V
  • W-phase current from W-phase inverter 140W flows through W-phase coil 200W. current flows.
  • Inverters 140U, 140V, and 140W for each phase apply AC power with different phases to coils 200U, 200V, and 200W for each phase based on the rotational position of the rotor detected by Hall elements H1, H2, and H3 of motor 200. By doing so, a rotating magnetic field is generated. Desired rotational power is obtained from the rotor rotating by this rotating magnetic field.
  • the motor 200 may be another type of motor driven by an AC voltage.
  • the number of phases of the motor 200 is not limited to 3, and may be any natural number of 2 or more. Since the wheels 23 are rotated on the rails 22 by the rotational driving of the motor 200 as described above, the charging car 20 can move along the rails 22 .
  • the above configuration of the power supply device 100 supplies power to the coal charging vehicle 20 as a power supply target during a non-power failure or the like when the commercial power supply 110 is normally supplied.
  • the power supply device 100 includes a disconnection detection unit 150 and a temporary power supply unit 160 for temporarily supplying power to the coal charging vehicle 20 when the commercial power supply 110 is cut off.
  • the disconnection detection unit 150 detects disconnection from the commercial power supply 110 to which power is supplied. Specifically, the disconnection detection unit 150 constantly monitors the potential Vdd of the high-potential input line, and if the state in which Vdd is lower than a predetermined threshold continues for a certain period of time, it is determined that the commercial power supply 110 is not normally supplied. Then, a command to switch to temporary power from the temporary power supply unit 160 is issued. Typically, the loss of power due to a power failure of commercial power source 110 is detected by disconnection detection unit 150, and switching to temporary power is performed.
  • the temporary power supply unit 160 includes a charge/discharge switching unit 161 , a DC/DC converter 162 and a secondary battery 163 .
  • the charge/discharge switching unit 161 switches between charging and discharging of the secondary battery 163 .
  • the charge/discharge switching unit 161 operates the DC/DC converter 162 in the step-down mode, and charges the secondary battery 163 with the power from the commercial power supply 110 that has been stepped down for charging. do.
  • the charging/discharging switching unit 161 switches the DC/DC converter 162 to the step-up mode in response to a switch command from the disconnection detection unit 150 to temporary power, and the secondary battery 163 boosts the electric power discharged and supplies the inverter 140 and the coal loader 20 with extra electric power.
  • the DC/DC converter 162 functions as a booster that boosts the power generated by the secondary battery 163 to the voltage of temporary power.
  • the temporary power supply unit 160 of the present embodiment supplies temporary power with a higher voltage than the commercial power supply 110 to the power supply target. For example, when the commercial power supply 110 has a voltage of 600 V, the temporary power supply unit 160 supplies the temporary power boosted to 680 V by the DC/DC converter 162 to the inverter 140 and the coal packing car 20 .
  • FIG. 3 schematically illustrates the effect of raising the voltage of the temporary power above the mains power supply 110 .
  • a power failure of the commercial power supply 110 occurs at time T0 , and the potential Vdd of the high - potential input line temporarily drops . recovers.
  • FIG. 3A shows a comparative example in which the voltage of the temporary power is 600V equal to the commercial power supply 110, and FIG.
  • the DC potential Vdd is greatly affected by fluctuations in the load of the car 20 .
  • a temporary drop (negative peak) in the DC potential Vdd may occur as schematically illustrated.
  • the amount of drop in the DC potential Vdd due to load fluctuations gradually increases as the power supply capacity decreases due to discharging of the secondary battery 163 .
  • the inverter 140 cannot supply power to the coal loader 20, and the inverter 140 and the coal loader 20 may stop abnormally.
  • the DC potential Vdd of the temporary power is as low as 600V (equal to the commercial power supply 110), the margin voltage ⁇ V between it and the threshold potential Vth is small. discharge progresses, the DC potential Vdd tends to fall below the threshold potential Vth .
  • the DC potential Vdd of the temporary power is as high as 680V (higher than the commercial power supply 110), so the margin voltage ⁇ V between the threshold potential Vth is large, and the secondary battery Even if the discharge of 163 progresses, there is a low possibility that the DC potential Vdd will fall below the threshold potential Vth .
  • the voltage of the temporary power supplied by the temporary power supply unit 160 should be higher than that of the commercial power supply 110 .
  • the voltage of the temporary power is 5% or more higher than the voltage of the commercial power supply 110 (630V or more when the voltage of the commercial power supply 110 is 600V). More preferably, the voltage of the temporary power is 10% or more higher than the voltage of the commercial power supply 110 (660V or more when the voltage of the commercial power supply 110 is 600V).
  • the voltage of the temporary electric power be lower than the rated voltage of the inverter 140 and the coal packing car 20 .
  • the rated voltage is 720V. That is, the temporary power voltage of 680V in the embodiment of FIG. 3B is 10% or higher (660V or higher) than the voltage of the commercial power supply 110 and lower than the rated voltage of 720V.
  • the power supply device 100 of the present embodiment performs power supply control with an emphasis on product life when there is no power failure, and performs power supply control with an emphasis on safety and the like when there is a power failure.
  • FIG. 4 shows the results of tests conducted using an actual charging car 20 .
  • the 600 V commercial power supply 110 was cut off from the inverter 140 and the coal packing car 20 to cause a pseudo power failure, and then the power was switched to temporary power from the temporary power supply unit 160 .
  • the voltage of the temporary power is 680V, which is higher than the commercial power supply 110, and this appears as the DC potential Vdd .
  • the charging car 20 was caused to reciprocate between a first position and a second position on the rail 22 .
  • a peak of about 18 kW that appears periodically in the inverter power is observed in response to a temporary increase in load when the car 20 changes its traveling direction on the rail 22 .
  • the state of charge (SOC) of the secondary battery 163 is improved in response to the peak of the inverter power (indicated by the dotted line circle). This is because the secondary battery 163 is charged with the regenerated electric power generated when the rotation direction of the motor 200 of the coal charging car 20 changing direction is reversed.
  • the power supply device 100 is applied to a machine that performs repetitive motions such as the charging car 20, it is possible to extend the temporary power supply period by the regenerative power obtained periodically.
  • the regenerative power is also charged based on the high DC potential Vdd of 680V, so the charging efficiency is improved. Also, since the amount of current in the high-potential input line can be reduced by the higher DC potential Vdd , energy loss due to wiring resistance can also be reduced.
  • FIG. 5 schematically shows the configuration of an electric vehicle 21 in which the power supply device 100 of this embodiment is used.
  • the electric vehicle 21 is provided movably on rails 22 in the same manner as the charging vehicle 20 of FIGS. Specifically, the electric vehicle 21 reciprocates between a first position A and a second position B repetitively.
  • a commercial power supply 110A and a commercial power supply 110B are provided at the first position A and the second position B, respectively, and electric power is supplied by connecting the commercial power supply connection part 111 of the electric vehicle 21 moved to each of the positions A and B. to charge the secondary battery 163 . Since there is no commercial power supply available between the first position A and the second position B, the electric vehicle 21 drives the motor 200 with temporary power supplied from the temporary power supply unit 160 to , B.
  • the disconnection detection unit 150 may detect disconnection of the electric vehicle 21 from the commercial power sources 110A and 110B by constantly monitoring the potential Vdd of the high-potential input line as in FIG. It may be detected based on the operation information of the electric vehicle 21 acquired by the unit 151 . That is, since the movement of the electric vehicle 21 from the positions A and B can be detected based on the operation information, disconnection from the commercial power sources 110A and 110B linked to the positions A and B can be indirectly detected.
  • the charging vehicle 20 of the coke oven 1 and the electric vehicle 21 are exemplified as the power supply target of the power supply device 100, but the power supply target is not limited to this.
  • the power supply target may be industrial facilities and equipment such as environmental plants and water treatment facilities, and industrial machines such as boilers and construction machines used in such industrial sites.
  • each device described in the embodiments can be realized by hardware resources or software resources, or by cooperation between hardware resources and software resources.
  • Processors, ROMs, RAMs, and other LSIs can be used as hardware resources.
  • Programs such as operating systems and applications can be used as software resources.
  • the present invention relates to technology for supplying temporary power to a power supply target.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
PCT/JP2022/004449 2021-03-08 2022-02-04 電力供給装置、電力供給方法 WO2022190731A1 (ja)

Priority Applications (1)

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JP2021036349 2021-03-08

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51149U (enrdf_load_stackoverflow) * 1974-06-18 1976-01-05
JPS5594546A (en) * 1979-01-13 1980-07-18 Matsushita Electric Works Ltd Electric power interruption compensating circuit
JP2016187284A (ja) * 2015-03-27 2016-10-27 住友重機械工業株式会社 電力変換装置およびそれを用いた産業機械

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51149U (enrdf_load_stackoverflow) * 1974-06-18 1976-01-05
JPS5594546A (en) * 1979-01-13 1980-07-18 Matsushita Electric Works Ltd Electric power interruption compensating circuit
JP2016187284A (ja) * 2015-03-27 2016-10-27 住友重機械工業株式会社 電力変換装置およびそれを用いた産業機械

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