DE102009057282B4 - Current Measurement System - Google Patents
Current Measurement System Download PDFInfo
- Publication number
- DE102009057282B4 DE102009057282B4 DE200910057282 DE102009057282A DE102009057282B4 DE 102009057282 B4 DE102009057282 B4 DE 102009057282B4 DE 200910057282 DE200910057282 DE 200910057282 DE 102009057282 A DE102009057282 A DE 102009057282A DE 102009057282 B4 DE102009057282 B4 DE 102009057282B4
- Authority
- DE
- Germany
- Prior art keywords
- current
- inverter
- determining
- idc
- measuring system
- 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.)
- Expired - Fee Related
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
Abstract
Strommesssystem eines Spannungszwischenkreis-Umrichters, an dessen lastseitigen Wechselrichter (1) ein Wechselstrommotor (2) angeschlossen ist, mit Mitteln zum Bestimmen eines Gleichspannungs-Zwischenkreisstromes (Idc) und eines Phasenstromes (Ie) genau eines Brückenzweiges des Wechselrichters (1), mit einem Mittel zur Bestimmung eines Wechselstromanteils des ermittelten Phasenstromes (Ie) und zur Bestimmung eines Wechselrichter-Ausgangsstromes aus dem ermittelten Wechselstromanteil des Phasenstromes (Ie) und dem ermittelten Gleichspannungs-Zwischenkreisstrom (Idc), wobei zum Bestimmen des Gleichspannungs-Zwischenkreisstromes (Idc) drei Widerstände (41, 42, 43) vorgesehen sind, die einerseits jeweils mit einem Emitter-Anschluss eines unteren Halbleiterschalters eines Brückenzweiges des Wechselrichters (1) und andererseits mit einem Eingang (44) einer Messeinrichtung (9) elektrisch leitend verbunden sind.Current measuring system of a voltage intermediate-circuit converter, to whose load-side inverter (1) an AC motor (2) is connected, with means for determining a DC-DC link current (Idc) and a phase current (Ie) exactly one bridge branch of the inverter (1), with a means for determining an alternating current component of the determined phase current (Ie) and for determining an inverter output current from the determined alternating current component of the phase current (Ie) and the ascertained direct voltage intermediate circuit current (Idc), three resistors (41st) being used for determining the direct current intermediate circuit current (Idc) , 42, 43) are provided, which are connected on the one hand in each case electrically connected to an emitter terminal of a lower semiconductor switch of a bridge branch of the inverter (1) and on the other hand with an input (44) of a measuring device (9).
Description
Die Erfindung bezieht sich auf ein Strommesssystem eines Spannungszwischenkreis-Umrichters, an dessen lastseitigten Wechselrichter ein Wechselstrommotor angeschlossen ist.The invention relates to a current measuring system of a voltage source inverter, to whose load-side inverter an AC motor is connected.
Um einen Wechselstrommotor eine Motorspannung variabler Amplitude und Frequenz zur Verfügung zu stellen, ist dieser mit Ausgängen eines lastseitigen Stromrichters eines Spannungszwischenkreis-Umrichters verknüpft. Wenn dieser lastseitige Stromrichter überwiegend Energie aus einem Spannungszwischenkreis des Spannungszwischenkreis-Umrichters zum Motor treibt, arbeitet dieser lastseitige Stromrichter als Wechselrichter. Aus diesem Grund wird der lastseitige Stromrichter eines Spannungszwischenkreis-Umrichters auch als Wechselrichter bezeichnet. Zur Steuerung dieses Motors wird der Istwert des Motorstroms benötigt. Dieser muss möglichst genau ermittelt werden. Es ist naheliegend, den in den zwischen Wechselrichter und Wechselstrommotor vorhandenen Anschlussleitungen fließenden Motorstrom mittels Strommesseinrichtungen zu messen. Da die Steuerelektronik des Spannungszwischenkreis-Umrichters auf Erdpotential bzw. auf dem Minus-Potential des Spannungszwischenkreises bezogen ist, müssen die Strommesseinrichtungen spannungsmäßig vom Bezugspotential isoliert sein.In order to provide an AC motor with variable amplitude and frequency motor voltage, it is linked to outputs of a load-side converter of a voltage source inverter. If this load-side converter predominantly drives energy from a voltage intermediate circuit of the voltage source inverter to the motor, this load-side converter operates as an inverter. For this reason, the load-side converter of a voltage source inverter is also referred to as an inverter. To control this motor, the actual value of the motor current is required. This must be determined as accurately as possible. It is obvious to measure the motor current flowing in the connection lines between the inverter and the AC motor by means of current measuring devices. Since the control electronics of the voltage source inverter is referenced to ground potential or to the negative potential of the voltage intermediate circuit, the current measuring devices must be isolated in terms of voltage from the reference potential.
Es ist ebenfalls wünschenswert, dass im Falle eines Kurzschlusses an den Ausgängen des Wechselrichters dieser in der Lage noch sein soll, möglichst schnell abschalten zu können, bevor seine Halbleiterschalter in Folge seines Überstromes zerstört werden.It is also desirable that in the event of a short circuit at the outputs of the inverter, it should still be able to switch off as quickly as possible before its semiconductor switches are destroyed as a result of its overcurrent.
Aus der
Aus der
Aus der
Der Erfindung liegt nun die Aufgabe zugrunde, eine Vorrichtung zum Messen eines Motorstromes anzugeben, die die vorgenannten Nachteile nicht mehr aufweist, die kostengünstiger ist und die schnell auf einen auftretenden Kurzschlussstrom reagieren kann.The invention is an object of the invention to provide a device for measuring a motor current, which no longer has the aforementioned disadvantages, which is less expensive and can react quickly to a short-circuit current occurring.
Diese Aufgabe wird mit Merkmalen den Anspruchs 1 erfindungsgemäß gelöst.This object is achieved with features of
Mit dem erfindungsgemäßen Strommesssystem werden ein im Gleichspannungszwischenkreis eines Spannungszwischenkreis-Umrichters fließender Strom und ein Phasenstrom genau eines Brückenzweiges eines mehrpulsigen Wechselrichters des Spannungszwischenkreis-Umrichters gemessen. Aus diesem ermittelten Phasenstrom wird eine Wechselstromkomponente ermittelt, die mit dem ermittelten Strom im Gleichspannungszwischenkreis addiert wird. Dieser zusammengesetzte Strom entspricht einem Motorstrom.With the current measuring system according to the invention, a current flowing in the DC intermediate circuit of a voltage intermediate-circuit converter and a phase current of exactly one bridge branch of a multi-pulse inverter of the voltage intermediate-circuit converter are measured. From this determined phase current, an AC component is determined, which coincides with the determined current in the DC intermediate circuit is added. This composite current corresponds to a motor current.
Beim erfindungsgemäßen Strommesssystem wird gegenüber den beiden bekannten Strommesssystemen ein handelsübliches Sixpack-Modul für den Wechselrichter verwendet. Bei manchen bekannten Strommesssystemen werden nur zwei Widerstände benötigt. D. h., es werden somit auch nur zwei Analog-/Digital-Wandler benötigt. Das erfindungsgemäße Strommesssystem weist nicht mehr die Nachteile der bekannten Strommesssysteme auf und ist außerdem kostengünstiger.In the current measuring system according to the invention, a commercially available six-pack module for the inverter is used in comparison with the two known current measuring systems. Some known current measuring systems require only two resistors. This means that only two analog / digital converters are needed. The current measuring system according to the invention no longer has the disadvantages of the known current measuring systems and is also less expensive.
Zur näheren Erläuterung der Erfindung wird auf die Zeichnung Bezug genommen, in der mehrere Ausführungsformen des erfindungsgemäßen Strommesssystems schematisch veranschaulicht sind.For a more detailed explanation of the invention, reference is made to the drawing, in which several embodiments of the current measuring system according to the invention are illustrated schematically.
Die
In der
Mittels dieser Messeinrichtung
Das Flussdiagramm der Schutzfunktion ist in der
In der
In der
Claims (5)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200910057282 DE102009057282B4 (en) | 2009-12-07 | 2009-12-07 | Current Measurement System |
CN201010575697.7A CN102095918B (en) | 2009-12-07 | 2010-12-06 | AC motor drive current measuring system and method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200910057282 DE102009057282B4 (en) | 2009-12-07 | 2009-12-07 | Current Measurement System |
Publications (2)
Publication Number | Publication Date |
---|---|
DE102009057282A1 DE102009057282A1 (en) | 2011-06-09 |
DE102009057282B4 true DE102009057282B4 (en) | 2013-05-29 |
Family
ID=43972377
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE200910057282 Expired - Fee Related DE102009057282B4 (en) | 2009-12-07 | 2009-12-07 | Current Measurement System |
Country Status (2)
Country | Link |
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CN (1) | CN102095918B (en) |
DE (1) | DE102009057282B4 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102016217874A1 (en) | 2016-09-19 | 2018-03-22 | Bayerische Motoren Werke Aktiengesellschaft | Method for current measurement on an inverter, current measuring device and inverter unit therewith |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010042946A1 (en) * | 2010-10-26 | 2012-04-26 | Lenze Se | frequency converter |
CN102998648B (en) * | 2012-12-13 | 2015-07-08 | 湖南省电力公司科学研究院 | Multifunctional electric meter for alternating and direct currents |
CN105917562A (en) | 2013-12-04 | 2016-08-31 | 施耐德电气It公司 | Improvement of inverter regulation |
EP2963426B1 (en) * | 2014-06-30 | 2018-05-30 | Microelettrica Scientifica S.p.A. | Measuring arrangement for measuring direct and alternating current |
EP3160033B1 (en) * | 2015-10-20 | 2022-12-14 | Schneider Electric IT Corporation | Current sensing system for full-bridge pulse-width modulated inverter system |
DE102020111901B3 (en) * | 2020-05-03 | 2021-04-22 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Method and device for determining the intermediate circuit current of a converter |
CN113049868A (en) * | 2021-03-10 | 2021-06-29 | 优利德科技(中国)股份有限公司 | Alternating current and direct current measuring device and measuring method |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6693404B2 (en) * | 2001-07-27 | 2004-02-17 | Hitachi, Ltd. | AC current detecting device for inverter apparatus and AC current detecting method therefor |
GB2426393A (en) * | 2005-05-20 | 2006-11-22 | Siemens Ag | An AC motor drive current measurement system |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9924299D0 (en) | 1999-10-15 | 1999-12-15 | Siemens Ag | Apparatus and method for measuring current |
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2009
- 2009-12-07 DE DE200910057282 patent/DE102009057282B4/en not_active Expired - Fee Related
-
2010
- 2010-12-06 CN CN201010575697.7A patent/CN102095918B/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6693404B2 (en) * | 2001-07-27 | 2004-02-17 | Hitachi, Ltd. | AC current detecting device for inverter apparatus and AC current detecting method therefor |
GB2426393A (en) * | 2005-05-20 | 2006-11-22 | Siemens Ag | An AC motor drive current measurement system |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102016217874A1 (en) | 2016-09-19 | 2018-03-22 | Bayerische Motoren Werke Aktiengesellschaft | Method for current measurement on an inverter, current measuring device and inverter unit therewith |
Also Published As
Publication number | Publication date |
---|---|
CN102095918A (en) | 2011-06-15 |
DE102009057282A1 (en) | 2011-06-09 |
CN102095918B (en) | 2015-09-30 |
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OP8 | Request for examination as to paragraph 44 patent law | ||
R018 | Grant decision by examination section/examining division | ||
R020 | Patent grant now final |
Effective date: 20130830 |
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R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |