WO2024209628A1 - Installation d'alimentation en services auxiliaires - Google Patents

Installation d'alimentation en services auxiliaires Download PDF

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Publication number
WO2024209628A1
WO2024209628A1 PCT/JP2023/014254 JP2023014254W WO2024209628A1 WO 2024209628 A1 WO2024209628 A1 WO 2024209628A1 JP 2023014254 W JP2023014254 W JP 2023014254W WO 2024209628 A1 WO2024209628 A1 WO 2024209628A1
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WO
WIPO (PCT)
Prior art keywords
power
conversion device
adjustment
storage device
power conversion
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2023/014254
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English (en)
Japanese (ja)
Inventor
雄治 細川
潤也 金田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi GE Vernova Nuclear Energy Ltd
Original Assignee
Hitachi-GE Nuclear Energy Ltd
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.)
Filing date
Publication date
Application filed by Hitachi-GE Nuclear Energy Ltd filed Critical Hitachi-GE Nuclear Energy Ltd
Priority to JP2025512322A priority Critical patent/JPWO2024209628A1/ja
Priority to PCT/JP2023/014254 priority patent/WO2024209628A1/fr
Publication of WO2024209628A1 publication Critical patent/WO2024209628A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; 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
    • H02J3/28—Arrangements for balancing of the load in networks by storage of energy
    • H02J3/32—Arrangements for balancing of the load in networks by storage of energy using batteries or super capacitors with converting means

Definitions

  • the present invention relates to an adjustment power supply system that can be used when output fluctuations are required in a power grid.
  • variable renewable energy sources such as solar power and wind power are, in principle, dependent on natural conditions for their power output, making it difficult to predict the power output in advance, and there are cases where the expected output differs significantly from the actual output.
  • VRE variable renewable energy sources
  • Even when such variable power sources are added, in order to maintain high power quality, a power source that can act as an adjustment capacity to absorb the fluctuations in power output caused by the variable power sources is required.
  • the function of adjustment capacity has been fulfilled by thermal power generation and hydroelectric power generation. Hydroelectric power generation is used as an excellent energy storage facility. Thermal power generation is used to take advantage of its excellent adjustment capacity.
  • Nuclear power plants are another large-scale power source other than hydroelectric and thermal power plants, but because nuclear power plants have a lower output adjustment capacity compared to other power sources, they have traditionally been operated as baseload plants. Adjusting the output of nuclear power plants themselves has been considered in the past, and they do have a certain degree of output adjustment capability.
  • Patent Document 1 shows a configuration for calculating the adjustment capacity required for a power system based on predicted system information and measured system information, and controlling generators and other system stabilization devices connected to the power system. Normally, power systems are controlled in this way, with each piece of equipment being controlled independently. However, by controlling together equipment that is currently controlled independently, it is possible to achieve benefits such as improving the operating rate of power plants and providing flexible adjustment capacity to the power system.
  • nuclear power plants are attracting attention as a clean source of energy, and are now considered important in terms of energy security, with the development of new reactors becoming more active. An increase in installed capacity is expected worldwide in the future. In this situation, it is conceivable that nuclear power plants could take the place of thermal power plants, but due to the principles of how they generate electricity, nuclear power plants are not suited to output adjustments and are basically operated as baseload power sources. Therefore, there is a possibility that nuclear power plants will not be able to cover the output adjustment operations that have traditionally been carried out by thermal power plants.
  • the present invention was made in consideration of the above-mentioned problems, and its purpose is to support the output adjustment of nuclear power plants using externally installed adjustment power supply equipment, enabling more flexible output adjustments and stabilizing power quality while at the same time operating the nuclear power plant at as constant an output as possible, thereby improving the availability and economic efficiency of the nuclear power plant.
  • the adjustment power supply equipment of the present invention has a first power conversion device that is connected to an on-site circuit in a nuclear power plant and converts AC power to DC power, a power storage device that is connected to the first power conversion device and stores power and supplies adjustment power to the power grid, a second power conversion device that is connected to the power storage device and converts the DC power of the power storage device to AC power, and a control device that controls the first power conversion device and the second power conversion device, and the AC side of the second power conversion device is connected to the on-site circuit, and when the request from the central load dispatching center exceeds the specifications of the generator, the control device supplies power to the power grid via the main circuit of the nuclear power plant using the power of the power storage device as the adjustment power required by the power grid, and when the request from the central load dispatching center does not exceed the specifications of the generator, it charges the power storage device with power.
  • an externally installed adjustment power supply facility can support the output adjustment of a nuclear power plant, enabling more flexible output adjustments and stabilizing power quality while at the same time enabling the nuclear power plant to operate at the most constant output possible, thereby improving the availability and economic efficiency of the nuclear power plant.
  • FIG. 1 is a diagram showing a typical configuration example of an adjustment power supply facility installed next to a power plant.
  • FIG. 1 is a diagram illustrating a typical configuration example of an adjustment power supply facility installed in a power distribution system.
  • FIG. 2 is a diagram showing a configuration of an adjustment power supply facility according to the first embodiment.
  • FIG. 11 is a diagram showing a configuration of an adjustment power supply facility according to a second embodiment.
  • FIG. 13 is a diagram showing the configuration of an adjusting power supply facility according to a third embodiment (combined with a hydrogen production device).
  • FIG. 1 is a diagram showing an example of a configuration diagram of a hydrogen production device.
  • the present invention relates to a configuration in which, when output fluctuations become necessary in a power grid and an output adjustment function is achieved at a nuclear power plant, the output adjustment of the nuclear power plant is supported by an external adjustment power supply facility.
  • FIG. 1 is a diagram showing an example of a configuration example of an adjustment power supply facility installed at a power plant.
  • the adjustment power supply facility 105 for the system is connected to the in-house circuit via a transformer 108.
  • the adjustment power supply facility 105 is connected to the power system 104 via a transformer 103 (main transformer).
  • the adjustment power supply facility 105 is installed independently of the power plant 101.
  • the power system 104 indicates an extra-high voltage system. Since the adjustment power supply facility 105 functions as an adjustment power, it is configured to exchange monitoring signals and the like with a central load dispatching center 109 via a dedicated line 111 as necessary.
  • the control device 110 is installed to control the semiconductor elements in the semiconductor power conversion device 107. Since the power plant 101 and the adjustment power supply facility 105 for the system are installed independently, there is usually no control between them.
  • the adjustment power supply facility 105 controls the semiconductor power conversion device 107 using a control device 110 in response to commands from a central load control center 109 in accordance with the power traded in the adjustment power market or the like, and transmits and receives power to and from the power grid 104.
  • FIG. 2 is a diagram showing an example of a typical configuration of an adjustment power supply facility installed in a power distribution system.
  • the basic configuration and operation are the same as the example in FIG. 1, but the connection destination of the adjustment power supply facility 105 is different from that in FIG. 1, and it is the power distribution system 202 via a transformer 201.
  • First Embodiment 3 is a diagram showing the configuration of an adjustment power supply facility 306 according to the first embodiment. Note that this configuration is a schematic circuit configuration showing only the main facility configuration for ease of understanding.
  • a generator 102 of a nuclear power plant 305 is connected to a power grid 307 via a transformer 103 (main transformer).
  • the regulating power supply equipment 306 includes a first semiconductor power conversion device 301 (first power conversion device) that is connected to the on-site circuit in the nuclear power plant via a transformer 303 and converts AC power to DC power, a storage battery 106 (power storage device) that is connected to the first semiconductor power conversion device 301 and stores power and supplies regulating power to the power grid 307, a second semiconductor power conversion device 302 (second power conversion device) that is connected to the storage battery 106 and converts the DC power of the storage battery 106 to AC power, and a control device 110 that controls the first semiconductor power conversion device 301 and the second semiconductor power conversion device 302.
  • the AC side of the second semiconductor power conversion device 302 is connected to the on-site circuit via a transformer 304.
  • the first semiconductor power conversion device 301 under the control of the control device 110, converts the power difference between the output of the generator 102 of the nuclear power plant 305 and the required amount of power to be transmitted from AC power to DC power, and stores the power in the storage battery 106.
  • the second semiconductor power conversion device 302 under the control of the control device 110 based on control at its own end or commands from the central load dispatching center 109, supplies the power of the storage battery 106 to the power grid 307 via the in-house circuit of the adjustment power.
  • the first semiconductor power conversion device 301 is always active, and the second semiconductor power conversion device 302 is active when there is a request to discharge.
  • the storage battery 106 can be charged at all times via the first semiconductor power conversion device 301, making it easy to manage charging and discharging of the storage battery 106.
  • the remaining charge detection system for the storage battery 106 monitors the SOC (States of Charge) of the storage battery 106, and if the SOC falls below a predetermined value, the second semiconductor power conversion device 302 is stopped and charging is immediately started, making control easy.
  • SOC States of Charge
  • the voltage class of the power grid 307 varies depending on factors such as the capacity of the nuclear power facility, so the description here does not limit the voltage class. Unlike the existing configuration in Figure 1, this configuration allows for a continuous supply of regulating power, making it possible to use the nuclear power plant 305 as a stable power source for regulating power.
  • Second Embodiment Fig. 4 is a diagram showing the configuration of an adjustment power supply facility 306A according to the second embodiment.
  • the second semiconductor power conversion device 302 is connected to an electric power system 307 via a transformer 401.
  • the description here does not limit the voltage class, and the voltage class may be the same as or different from that of the power plant.
  • the regulating power supply equipment 306A includes a first semiconductor power conversion device 301 (first power conversion device) that is connected to the on-site circuit in the nuclear power plant via a transformer 303 and converts AC power to DC power, a storage battery 106 (power storage device) that is connected to the first semiconductor power conversion device 301 and stores power and supplies regulating power to the power grid 307, a second semiconductor power conversion device 302 (second power conversion device) that is connected to the storage battery 106 and converts the DC power of the storage battery 106 to AC power, and a control device 110 that controls the first semiconductor power conversion device 301 and the second semiconductor power conversion device 302, and the AC side of the second semiconductor power conversion device 302 is connected to the power grid 307 via a transformer 401.
  • first semiconductor power conversion device 301 first power conversion device
  • storage battery 106 power storage device
  • second semiconductor power conversion device 302 second power conversion device
  • the first semiconductor power conversion device 301 is operated in the same manner as in FIG. 3.
  • the second semiconductor power conversion device 302 directly supplies regulating power to the power grid 307 using the power of the storage battery 106 under the control of the control device 110 based on control at its own end or commands from the central load dispatching center 109.
  • regulating power can be supplied continuously, making it possible to use the nuclear power plant 305 as a stable power source for regulating power, and reducing capacity pressure on the power grid caused by forward power flow when charging the storage battery 106.
  • since there is no need to go through the nuclear power plant's transformer 103 it is also possible to reduce losses and voltage drops in the transformer 103 and the connected electrical circuits.
  • the SOC is maintained at a predetermined value, and when a downward adjustment power is requested, the storage battery 106 is charged via the second semiconductor power conversion device 302.
  • FIG. 5 is a diagram showing the configuration of an adjusting power supply facility 306B according to the third embodiment (combined with a hydrogen production device 501).
  • the third embodiment has a configuration in which a hydrogen production device 501 is added to the second embodiment. That is, Fig. 5 shows the hydrogen production device 501 connected to the configuration in Fig. 4.
  • Fig. 6 shows one example that utilizes the principle of water electrolysis.
  • FIG. 6 shows an example of the configuration of hydrogen production device 501. Since water electrolysis is performed using a DC power source, an AC power source 601 is connected to a semiconductor power conversion device 603 via a transformer 602, and the semiconductor power conversion device 603 converts AC power to DC power and applies a DC voltage to an anode 604 and a cathode 605 installed in an electrolyte 606, causing water electrolysis and generating hydrogen on the cathode side.
  • FIG. 6 shows a configuration for water electrolysis, but facilities that use electrolysis using other methods also use a similar principle, using a DC power source.
  • a semiconductor power conversion device 603 is required, which also serves as the first semiconductor power conversion device 301 and the second semiconductor power conversion device 302 for the storage battery.
  • a schematic circuit configuration is shown that shows only the main equipment components, and descriptions of circuit breakers, etc. are omitted.
  • the hydrogen production device 501 can provide further downward adjustment capability. Furthermore, when there is high demand for electricity and the hydrogen production device 501 is not being supplied with power from the power plant, operation using the storage battery 106 can be enabled, thereby increasing the operating rate of the hydrogen production device 501 and making it possible to produce hydrogen at low cost.
  • the hydrogen production device 501 is shown as a demand facility, but similar effects can be expected with any facility that can be operated rationally by increasing its operating rate.
  • the equipment referred to as the storage battery 106 can also replace the function of any equipment that can store energy.
  • the externally installed adjustment power supply equipment 306 can support the output adjustment of the nuclear power plant and enable more flexible output adjustment, thereby stabilizing the power quality, while at the same time enabling the nuclear power plant to operate at a constant output as much as possible, thereby improving the operating rate and economic efficiency of the nuclear power plant.
  • the adjustment power supply equipment includes a first power conversion device connected to the on-site circuit within the nuclear power plant and converting AC power into DC power, a power storage device connected to the first power conversion device and storing power and supplying adjustment power to the power grid, a second power conversion device connected to the power storage device and converting the DC power of the power storage device into AC power, and a control device 110 that controls the first power conversion device and the second power conversion device, and the AC side of the second power conversion device is connected to the power grid, and when the request from the central load dispatching center exceeds the specifications of the generator, the control device 110 supplies power to the power grid without going through the power plant's transformer, using the power of the power storage device as the adjustment power required by the power grid, and when the request from the central load dispatching center does not exceed the specifications of the generator, it charges the power storage device with power.
  • the externally installed adjustment power supply equipment 306 supports the output adjustment of the nuclear power plant, enabling more flexible output adjustments to stabilize the quality of electricity, while at the same time allowing the nuclear power plant to operate at the highest possible constant output, improving the operation rate and economic efficiency of the nuclear power plant.
  • the adjustment power supply facility has a DC power demand facility, and the control device 110 can cause the demand facility to function as a down-regulation power. This allows for flexible response to requests for down-regulation power.
  • the adjustment power supply facility has a hydrogen production device as a DC power demand facility, and when there is no external power supply to the adjustment power supply facility, hydrogen can be produced using power from the power storage device.
  • the demand facility is a hydrogen production device
  • the adjustment power supply facility can produce hydrogen using electricity from the power storage device when there is no external power supply.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

Une installation d'alimentation en services auxiliaires (306) comprend : un premier dispositif de conversion de puissance (premier dispositif de conversion de puissance à semi-conducteur [301]) qui est connecté à un circuit interne dans une centrale nucléaire et qui convertit une puissance CA en puissance CC ; un dispositif de stockage d'énergie (batterie de stockage [106]) qui est connecté au premier dispositif de conversion de puissance, qui stocke de l'énergie et qui fournit de l'énergie de services auxiliaires à un système d'alimentation ; un second dispositif de conversion de puissance (second dispositif de conversion de puissance à semi-conducteur [302]) qui est connecté au dispositif de stockage d'énergie et qui convertit la puissance CC du dispositif de stockage d'énergie en puissance CA ; et un dispositif de commande (110) qui commande le premier dispositif de conversion de puissance et le second dispositif de conversion de puissance. Le côté CA du second dispositif de conversion de puissance est connecté au circuit interne. Lorsqu'une requête provenant d'un bureau d'instruction d'alimentation électrique centrale dépasse la spécification d'un générateur, le dispositif de commande (110) détermine la puissance du dispositif de stockage d'énergie en tant que puissance de services auxiliaires requise par le système d'alimentation, et fournit l'énergie au système d'alimentation par l'intermédiaire d'un circuit principal de la centrale nucléaire, tandis que lorsque la requête provenant du bureau d'instruction d'alimentation électrique centrale ne dépasse pas la spécification du générateur, le dispositif de commande charge le dispositif de stockage d'énergie avec de l'énergie.
PCT/JP2023/014254 2023-04-06 2023-04-06 Installation d'alimentation en services auxiliaires Ceased WO2024209628A1 (fr)

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JP2025512322A JPWO2024209628A1 (fr) 2023-04-06 2023-04-06
PCT/JP2023/014254 WO2024209628A1 (fr) 2023-04-06 2023-04-06 Installation d'alimentation en services auxiliaires

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PCT/JP2023/014254 WO2024209628A1 (fr) 2023-04-06 2023-04-06 Installation d'alimentation en services auxiliaires

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001037085A (ja) * 1999-07-22 2001-02-09 Kansai Electric Power Co Inc:The 二次電池を含む電力系統の周波数制御方法及びその装置
JP2010164391A (ja) * 2009-01-15 2010-07-29 Toshihisa Shirakawa 日負荷追随原子力発電所
JP2022183885A (ja) * 2021-05-31 2022-12-13 株式会社日立製作所 原子力プラント及び原子力プラントの水素製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001037085A (ja) * 1999-07-22 2001-02-09 Kansai Electric Power Co Inc:The 二次電池を含む電力系統の周波数制御方法及びその装置
JP2010164391A (ja) * 2009-01-15 2010-07-29 Toshihisa Shirakawa 日負荷追随原子力発電所
JP2022183885A (ja) * 2021-05-31 2022-12-13 株式会社日立製作所 原子力プラント及び原子力プラントの水素製造方法

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