WO2023026358A1 - Système de suppression d'harmoniques et dispositif de filtre actif - Google Patents

Système de suppression d'harmoniques et dispositif de filtre actif Download PDF

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Publication number
WO2023026358A1
WO2023026358A1 PCT/JP2021/030967 JP2021030967W WO2023026358A1 WO 2023026358 A1 WO2023026358 A1 WO 2023026358A1 JP 2021030967 W JP2021030967 W JP 2021030967W WO 2023026358 A1 WO2023026358 A1 WO 2023026358A1
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WO
WIPO (PCT)
Prior art keywords
active filter
filter device
inverter
current
module
Prior art date
Application number
PCT/JP2021/030967
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English (en)
Japanese (ja)
Inventor
広樹 杉山
研一 山本
天 藍
浩由 森本
Original Assignee
東芝キヤリア株式会社
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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Application filed by 東芝キヤリア株式会社 filed Critical 東芝キヤリア株式会社
Priority to PCT/JP2021/030967 priority Critical patent/WO2023026358A1/fr
Publication of WO2023026358A1 publication Critical patent/WO2023026358A1/fr

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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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics

Definitions

  • Embodiments of the present invention relate to a system for suppressing harmonics in a power supply connected to a load that generates harmonics, such as an inverter, and an active filter device used in the system.
  • a chiller which is a type of refrigeration system, generally has a large capacity and is equipped with a plurality of control modules including inverters, so there is a possibility that the influence of harmonic currents on the power supply side will be greater.
  • Patent Document 1 For example, in Patent Document 1, three active filter devices that suppress harmonic currents are connected in parallel to one power converter, and the number of operating units and the number of operating groups are disclosed according to the magnitude of the compensation current. A system for varying alignment is disclosed.
  • chillers are designed to handle maximum load conditions, not all control modules are always in operation, and some control modules may be stopped depending on the load condition. . In that case, if the operation of the control module to which the active filter device is not connected continues, the amount of outflow of harmonic current will increase. Also, under light load conditions, it is conceivable to operate only the control module to which the active filter device is connected. However, in general, each control module is often operated in rotation in order to equalize the operation time of each control module in consideration of extending the equipment life. Therefore, it is not desirable to concentrate operation only on a specific control module.
  • a harmonic suppression system capable of appropriately suppressing harmonic currents as a whole even in a configuration in which the number of active filter devices less than the number of control modules is provided, and an active filter device used in the system. offer.
  • a harmonic suppression system includes active filter devices, the number of which is smaller than the number of inverters, a plurality of current sensors for detecting a current input to the plurality of inverters from a commercial AC power supply, the inverter and a control unit for controlling the operation of an active filter device, wherein sensor signals from two or more of the current sensors are input to the active filter device, and harmonics flowing out to the commercial AC power supply side by the active filter device.
  • Control for suppressing wave current is executed, and when the control unit stops the operation of one or more inverters, the current sensor is connected to the active filter device to which the inverter whose operation is stopped is connected. , and the control for suppressing the harmonic current is executed for the inverter that continues to operate.
  • the active filter device of the embodiment receives sensor signals from a plurality of current sensors that respectively detect currents input from a commercial AC power source to a plurality of inverters, and according to the sensor signals, the commercial AC power source side determines the inverter to be controlled to suppress the harmonic current flowing out to the inverter.
  • Drawing 1 is a 1st embodiment and is a figure showing composition of a chiller.
  • FIG. 2 is a diagram showing control rules by a control unit.
  • FIG. 3 shows a second embodiment and shows the configuration of the chiller.
  • FIG. 4 is a flow chart showing the control contents of the active filter device.
  • a plurality of modules 3 are connected to a three-phase 200V or 400V commercial AC power supply 2 .
  • it is composed of four modules 3(A) to 3(D).
  • Each of the modules 3(A) to 3(D) has an independent refrigeration cycle with the same capacity, and a heat medium such as water circulates between the refrigerant in this refrigeration cycle and the chiller user equipment. and exchange heat.
  • the heat medium heated or cooled as a result of heat exchange is sent to the utilization device, and the utilization side device is heated or cooled.
  • the module 3 includes a compressor that constitutes a part of the refrigeration cycle, and a rectifier circuit, such as a full-wave rectifier, that rectifies the AC voltage of the three-phase commercial AC power supply 2 and converts it into a DC voltage. , and an inverter that receives the DC voltage of the rectifier circuit and drives the compressor.
  • the module 3 is controlled in accordance with a drive command input from the control unit 4 to operate/stop and its ability during operation, ie, the output frequency of the inverter. More specifically, the control unit 4 detects the difference between the temperature setting value of the heat medium (not shown) and the temperature detected by the temperature sensor of the heat medium at the outlet or inlet of the chiller, and applies PI control or the like to this.
  • current sensors 5(A) and 5(B) for detecting respective harmonic currents are arranged on the power line, and the modules 3(C) and 3(D) ), current sensors 5(C) and 5(D) are also arranged on the power line.
  • Sensor signals from current sensors 5(A) and 5(B) are input to active filter device 6(1), and sensor signals from current sensors 5(C) and 5(D) are input to active filter device 6(2).
  • active filter device 6(1) sensor signals from current sensors 5(C) and 5(D) are input to active filter device 6(2).
  • the active filter device will also be simply referred to as an active filter.
  • Active filter 6(1) is connected to a 3-phase power line connected to module 3(A), and active filter 6(2) is connected to a 3-phase power line connected to module 3(C).
  • the active filter 6 includes a filter 7 and a control board 8, generates a waveform that is the opposite phase of the harmonic current waveform detected by the current sensor 5, and outputs the waveform to the power supply line. This suppresses the harmonic current generated by the operation of the inverter from flowing out to the system side of the commercial AC power supply 2 .
  • Active filter 6 is also controlled by controller 4 . In the following, harmonic currents are simply referred to as "harmonics".
  • FIG. 2 shows the control rule for the active filter 6(1) by the control unit 4, and the target of harmonic suppression is selected according to four states combining the drive states of the modules 3(A) and 3(B). decide.
  • Suppress harmonics in module 3(A) if both modules 3(A) and 3(B) are in the active state. If the module 3(A) is in a driving state and the module 3(B) is in a stopped state, harmonics of the module 3(A) are suppressed. If the module 3(A) is in a stopped state and the module 3(B) is in a driving state, the harmonics of the module 3(B) are suppressed. • If both modules 3(A) and 3(B) are in the stopped state, stop the operation of the active filter 6(1).
  • module 3(A) and 3(B) are in the drive state, module 3(A) is targeted for suppression, but module 3(B) may be targeted.
  • the control rule for the active filter 6(2) is obtained by replacing (A) with (C) and replacing (B) with (D).
  • Each active filter 6 of the present embodiment has the ability to suppress the maximum value of harmonics generated by one of the modules 3(A) to 3(D) having the same ability to within a predetermined range.
  • the maximum value generated by the module 3 of the base the one that does not have the ability to be suppressed to a predetermined range is selected. As a result, a small and inexpensive active filter 6 can be used.
  • the current sensors 5(A) and 5(B) are arranged on the power supply lines corresponding to the modules 3(A) and 3(B), and the modules 3(C) and 3 Current sensors 5(C) and 5(D) are arranged on the power line corresponding to (D).
  • the sensor signals of current sensors 5(A) and 5(B) are input to active filter 6(1), and the sensor signals of current sensors 5(C) and 5(D) are input to active filter 6(2).
  • the active filter 6(1) to which the module 3(A) is connected receives a high-frequency signal for the module 3(B), which continues to operate. Execute control to suppress waves.
  • the control unit 4 controls the active filter 6(1) as the module 3(B).
  • Reduce harmonics and for active filter 6(2) suppress harmonics for module 3(C).
  • FIG. 4 is a flow chart showing the control contents of the active filter 13(1).
  • the harmonic current values of the modules 3(A) and 3(B) are measured (S1), and the current values of both are compared (S2). If the current value of module 3(B) is greater than that of module 3(A) (YES), then the harmonics of module 3(B) are suppressed (S3), and the current value of module 3(B) increases to module 3 If (A) or less (NO), harmonics of module 3 (A) are suppressed (S4).
  • the active filter 13(2) is obtained by replacing (A) with (C) and (B) with (D). Since the value of harmonics is generally proportional to the output frequency of the inverter that drives the compressor, the module 3 having the higher output frequency of the inverter generates larger harmonics.
  • the module 3 to suppress harmonics is switched only by comparing the current values of the two modules 3.
  • a hysteresis is provided to prevent frequent switching.
  • the active filter 13 determines the module 3 to be controlled for suppressing the harmonic current flowing out to the AC power supply 2 side according to the sensor signal from the current sensor 5 . Specifically, the module 3 with the highest level of harmonic current is to be controlled. As a result, the active filter 13 can efficiently suppress harmonics and autonomously determine the module 3 to be controlled.
  • the number of modules 3 may be 3 or 5 or more.
  • the number of modules 3 to which one active filter 6 corresponds may be three or more.
  • the object to be driven by the inverter is not limited to the compressor, and may be a motor. Applicable products are not limited to chillers.
  • the active filter 6 is supplied with sensor signals from two or more current sensors provided on the side of the commercial AC power supply that serves as the power supply for the inverter, and the active filter 6 detects the commercial Control is executed to suppress harmonic current flowing out to the AC power supply side, and when the control unit stops the operation of one or more modules, that is, the inverter, the active filter 6 to which the inverter whose operation is stopped is connected The module connected to the current sensor and continuing to operate, ie, the inverter, is controlled to suppress the harmonic current.
  • the active filter 6 reduces harmonics generated by one of the inverters in operation among the plurality of inverters to which the current sensors are connected. Accordingly, in a system including a plurality of inverters such as a large chiller, it is possible to reduce the harmonics of the system while using the active filters in a number smaller than the number of inverters.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

L'invention concerne un système de suppression d'harmoniques apte à supprimer de manière appropriée des courants harmoniques dans leur ensemble dans une configuration qui est dotée d'un certain nombre de dispositifs de filtre actif qui est inférieur au nombre de modules de commande.　Des signaux de capteur provenant de deux capteurs de courant ou plus (5 (A) -5 (B)) sont entrés dans un dispositif de filtre actif (6 (1)), et une commande est exécutée pour utiliser le dispositif de filtre actif (6 (1)) pour supprimer des courants harmoniques circulant en direction d'une source d'alimentation en courant alternatif commercial (2). Une unité de commande (4) exécute une commande lorsque le fonctionnement d'un ou de plusieurs onduleurs (module 3 (B)) est arrêté, le capteur de courant (5 (A)) est connecté au dispositif de filtre actif (6 (1)) auquel l'onduleur qui a arrêté le fonctionnement est connecté, et un courant harmonique est supprimé pour un onduleur (module 3 (A)) qui continue à fonctionner.
PCT/JP2021/030967 2021-08-24 2021-08-24 Système de suppression d'harmoniques et dispositif de filtre actif WO2023026358A1 (fr)

Priority Applications (1)

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PCT/JP2021/030967 WO2023026358A1 (fr) 2021-08-24 2021-08-24 Système de suppression d'harmoniques et dispositif de filtre actif

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PCT/JP2021/030967 WO2023026358A1 (fr) 2021-08-24 2021-08-24 Système de suppression d'harmoniques et dispositif de filtre actif

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011035986A (ja) * 2009-07-30 2011-02-17 Sanyo Electric Co Ltd アクティブフィルター
JP2018099024A (ja) * 2016-12-09 2018-06-21 ダイキン工業株式会社 アクティブフィルタ内蔵機器
JP2018191373A (ja) * 2017-04-28 2018-11-29 ダイキン工業株式会社 アクティブフィルタ装置、及びそれを用いた空気調和装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011035986A (ja) * 2009-07-30 2011-02-17 Sanyo Electric Co Ltd アクティブフィルター
JP2018099024A (ja) * 2016-12-09 2018-06-21 ダイキン工業株式会社 アクティブフィルタ内蔵機器
JP2018191373A (ja) * 2017-04-28 2018-11-29 ダイキン工業株式会社 アクティブフィルタ装置、及びそれを用いた空気調和装置

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