JP5578983B2 - Phase loss detection method - Google Patents
Phase loss detection method Download PDFInfo
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- JP5578983B2 JP5578983B2 JP2010181688A JP2010181688A JP5578983B2 JP 5578983 B2 JP5578983 B2 JP 5578983B2 JP 2010181688 A JP2010181688 A JP 2010181688A JP 2010181688 A JP2010181688 A JP 2010181688A JP 5578983 B2 JP5578983 B2 JP 5578983B2
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Description
本発明は三相交流電源を直流に変換し三相交流電源の電流を正弦波となるように三相交流電圧をＰＷＭ制御するコンバータ装置に関わるものであり、入力される三相交流電源の欠相検出方法に関するものである。 The present invention relates to a converter device that converts a three-phase AC power source into a direct current and performs PWM control on the three-phase AC voltage so that the current of the three-phase AC power source becomes a sine wave. The present invention relates to a phase detection method.
三相交流電源を直流に変換し三相交流電源の電流を正弦波となるよう三相交流電圧をＰＷＭ制御するコンバータ装置（以下単に「ＰＷＭ正弦波コンバータ装置」という。）において、前記三相交流電源のうちどれか一相が欠相状態（以下単に「欠相」という。）となった場合、前記ＰＷＭ正弦波コンバータ装置をそのまま運転継続する事は危険であり、前記欠相を検出し前記ＰＷＭ正弦波コンバータ装置を停止させる必要がある。前記欠相のまま運転を継続すると危険となる−般の装置（以下単に「装置」という。）においては通常、前記欠相を検出する欠相検出回路がとりつけられており、前記欠相検出回路には前記欠相を検出するための電気回路が構成されている。前記欠相検出回路が前記欠相を検出した場合は、前記装置を停止させるよう構成されている。 In a converter device (hereinafter simply referred to as “PWM sine wave converter device”) that converts a three-phase AC power source into a direct current and PWM controls the three-phase AC voltage so that the current of the three-phase AC power source becomes a sine wave. If any one phase of the power supply is in an open phase state (hereinafter simply referred to as “open phase”), it is dangerous to continue the operation of the PWM sine wave converter device as it is. It is necessary to stop the PWM sine wave converter device. It is dangerous if the operation is continued with the phase loss. In general devices (hereinafter simply referred to as “devices”), a phase loss detection circuit for detecting the phase loss is usually installed. Is configured with an electric circuit for detecting the phase loss. The device is configured to stop when the phase loss detection circuit detects the phase loss.
図３は欠相検出回路を取り付けた三相交流電源を入力する従来の装置の例であり、以下図３を例に説明する。 FIG. 3 shows an example of a conventional apparatus for inputting a three-phase AC power source with an open-phase detection circuit, which will be described below with reference to FIG.
三相交流電源１は（従来の）三相交流電源を入力する装置９に接続されている。前記装置９の内部には欠相検出回路１０が内蔵されている。欠相検出回路１０の内部には前記三相交流電源１の欠相を検出するための電気回路が構成されている。前記三相交流電源１のうちどれか一相が欠相となった湯合、前記欠相検出回路１０が前記欠相を検出し、前記装置９を停止させる装置停止信号６を出力し、前記装置９を停止させるように構成されている。
The three-phase AC power source 1 is connected to a device 9 for inputting a (conventional) three-phase AC power source. A phase
以上のように、装置に取り付けられる、三相交流電源の欠相を検出する欠相検出回路により、前記欠相を検出する事ができるが、前記欠相検出回路には前記欠相を検出するための電気回路の構成が必要となる。前記欠相を検出するための電気回路を構成するためには電気部品が多数必要となり、また回路構成も複雑なものとなってしまう。
前記欠相検出回路の電気回路の構成については、例えば特許文献１や特許文献２などで多数提案されている。
As described above, the phase loss detection circuit that detects the phase loss of the three-phase AC power supply attached to the apparatus can detect the phase loss, but the phase loss detection circuit detects the phase loss. Therefore, an electric circuit configuration is required. In order to configure an electrical circuit for detecting the phase loss, a large number of electrical components are required, and the circuit configuration is complicated.
For example, Patent Document 1 and
以上の点を顧みて、本発明ではＰＷＭ正弦波コンバータ装置において、欠相検出のための電気回路を使用せずに三相交流電源の欠相を検出する方法を提供するものである。 In consideration of the above points, the present invention provides a method for detecting a phase loss of a three-phase AC power supply without using an electric circuit for phase loss detection in a PWM sine wave converter device.
本発明は、ＰＷＭ正弦波コンバータ装置において、前記ＰＷＭコンバータ装置に内蔵された、前記三相交流電源の三相電流を検出する検出器により検出された三相の電流検出値を、前記ＰＷＭ正弦波コンバータ装置に内蔵された演算処理器により三相−二相変換し、有効電流成分と無効電流成分に分離し、前記有効電流成分・前記無効電流成分を前記ＰＷＭ正弦波コンバータ装置に内蔵された演算処理器により三相交流電流を正弦波とするために演算された有効電流指令値・無効電流指令値との誤差から前記三相交流電源が欠相であるか判定することを特徴とする。 The present invention relates to a PWM sine wave converter device, wherein a three-phase current detection value detected by a detector for detecting a three-phase current of the three-phase AC power supply, incorporated in the PWM converter device, is converted into the PWM sine wave. Three-phase to two-phase conversion is performed by an arithmetic processor built in the converter device, and the active current component and the reactive current component are separated into the active current component and the reactive current component, and the arithmetic built in the PWM sine wave converter device. It is characterized in that it is determined whether or not the three-phase alternating current power supply is out of phase based on an error between the effective current command value and the reactive current command value calculated to make the three-phase alternating current into a sine wave by the processor.
本発明により、欠相検出のための電気回路を使用せずに三相交流電源の欠相を検出することが可能となる。 According to the present invention, it is possible to detect an open phase of a three-phase AC power supply without using an electric circuit for detecting an open phase.
本発明の好適な実施態様を以下の実施例を用いて説明する。 Preferred embodiments of the invention are illustrated using the following examples.
図１は本発明の実施例であり、以下に図１を例にして説明する。
三相交流電源１はＰＷＭ正弦波コンバータ装置２に接続されていて、前記ＰＷＭ正弦波コンバータ装置２の内部には三相電流検出器３と演算処理器５が内蔵されている。
FIG. 1 shows an embodiment of the present invention, which will be described below with reference to FIG.
The three-phase AC power source 1 is connected to a PWM sine
前記三相交流電源１の電流は前記三相電流検出器３により検出され、検出された三相電流検出信号４は演算処理器５へと入力される。前記演算処理器５は、入力された前記三相電流検出信号４を前記三相交流電源１の周波数に同期したサンプリングで図２に示すように三相−二相変換し、有効電流成分７と無効電流成分８を得る。
The current of the three-phase AC power source 1 is detected by the three-phase
前記三相交流電源１が正常な場合、前記有効電流成分７・前記無効電流成分８の値は、前記演算処理器により三相交流電流を正弦波とするために演算された有効電流指令値・無効電流指令値との誤差はほとんど生じない。 When the three-phase AC power supply 1 is normal, the values of the effective current component 7 and the reactive current component 8 are the effective current command value calculated by the arithmetic processor to make the three-phase AC current a sine wave, There is almost no error from the reactive current command value.
前記三相交流電源１のうちどれか一相が欠相となった場合、前記三相電流検出器３からの出力である前記三相電流検出信号４は、前記欠相である相の検出信号の値が異常値となり、前記演算処理器５により三相−二相変換し得られる前記有効電流成分・前記無効電流成分８の値は、前記演算処理器により演算された有効電流指令値・無効電流指令値との差が大きくなる。演算処理器５はこの前記誤差があるレベルにあることをもって前記三相交流電源１が前記欠相であると判断し、前記演算処理器５は前記ＰＷＭ正弦波コンバータ装置２を停止させる装置停止信号６を出力し前記ＰＷＭ正弦波コンバータ装置２を停止させる。
When any one of the three-phase AC power supplies 1 is open, the three-phase
以上により、欠相検出のための電気回路を使用せずに、三相交流電源の欠相状態を検出することが可能となり、三相交流電源を入力するＰＷＭ正弦波コンバータ装置の簡素化、小型化、保守の簡素化が可能となる。 As described above, it is possible to detect an open phase state of a three-phase AC power supply without using an electric circuit for detecting an open phase, and the PWM sine wave converter device for inputting the three-phase AC power supply is simplified and compact. And simplification of maintenance.
１ 三相交流電源
２ ＰＷＭ正弦波コンバータ装置
３ 三相電流検出器
４ 三相電流検出信号
５ 演算処理器
６ 装置停止信号
７ 有効電流成分
８ 無効電流成分
９ 従来の三相交流電源を入力する装置
１０ 欠相検出回路
DESCRIPTION OF SYMBOLS 1 Three-phase alternating
Claims (1)
In a converter device (hereinafter simply referred to as “PWM sine wave converter device”) that converts a three-phase AC power source into a direct current and PWM controls the three-phase AC voltage so that the current of the three-phase AC power source becomes a sine wave. A three-phase current detection value detected by a detector for detecting a three-phase current of the three-phase AC power source built in the converter device is converted into a three-phase-2 by an arithmetic processor built in the PWM sine wave converter device. phase conversion is separated into active current component and a reactive current component, said effective current component, said reactive current component, three-phase alternating current the arithmetic processor enable current computed by the command value to a sine wave, the A phase loss detection method comprising determining whether or not the three-phase AC power supply is in a phase loss state based on an error from a reactive current command value.
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| JP2010181688A JP5578983B2 (en) | 2010-08-16 | 2010-08-16 | Phase loss detection method |
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| JP2010181688A JP5578983B2 (en) | 2010-08-16 | 2010-08-16 | Phase loss detection method |
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| JP5578983B2 true JP5578983B2 (en) | 2014-08-27 |
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| JP6929724B2 (en) * | 2017-07-12 | 2021-09-01 | 株式会社東芝 | Open phase detection device, open phase detection system, and open phase detection method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH06165364A (en) * | 1992-11-26 | 1994-06-10 | Toyo Electric Mfg Co Ltd | Method of detecting open phase of ac power source |
| JP3267130B2 (en) * | 1995-12-11 | 2002-03-18 | 富士電機株式会社 | PWM control self-excited rectifier |
| JP2001169554A (en) * | 1999-12-06 | 2001-06-22 | Okuma Corp | Power converter |
| JP2005261157A (en) * | 2004-03-15 | 2005-09-22 | Fuji Electric Fa Components & Systems Co Ltd | Current detecting device for three-phase main circuit |
| JP4596251B2 (en) * | 2005-04-12 | 2010-12-08 | 富士電機ホールディングス株式会社 | Phase loss detection device and AC-AC direct conversion device |
| JP5255747B2 (en) * | 2005-07-05 | 2013-08-07 | 株式会社日立産機システム | Phase loss detection circuit and electrical equipment |
| JP2008151723A (en) * | 2006-12-20 | 2008-07-03 | Meidensha Corp | Instantaneous voltage drop detection device |
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