EP1419572A1 - Dispositif et procede pour surveiller la connexion d'une unite d'alimentation electrique - Google Patents

Dispositif et procede pour surveiller la connexion d'une unite d'alimentation electrique

Info

Publication number
EP1419572A1
EP1419572A1 EP02794725A EP02794725A EP1419572A1 EP 1419572 A1 EP1419572 A1 EP 1419572A1 EP 02794725 A EP02794725 A EP 02794725A EP 02794725 A EP02794725 A EP 02794725A EP 1419572 A1 EP1419572 A1 EP 1419572A1
Authority
EP
European Patent Office
Prior art keywords
phase
connection
current
monitoring
supply unit
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.)
Withdrawn
Application number
EP02794725A
Other languages
German (de)
English (en)
Inventor
Viktor Barinberg
Leo Monter
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1419572A1 publication Critical patent/EP1419572A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
    • H02H11/004—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of incorrect phase sequence; with switching for obtaining correct phase sequence
    • 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
    • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
    • 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
    • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
    • H02P21/34—Arrangements for starting
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/0833—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for electric motors with control arrangements
    • H02H7/0838—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for electric motors with control arrangements with H-bridge circuit

Definitions

  • the invention is based on a device and a method for monitoring the connection of an electrical supply unit according to the category of the independent claims.
  • a circuit arrangement for monitoring the failure of fuses is already known from DE 42 13 443 C1.
  • the fuses are each connected in the current paths of a three-phase network to supply a consumer.
  • the circuit arrangement has a first circuit in a delta connection for detecting the phase of a voltage between two conductors of the three-phase network in front of the fuses and a second
  • Circuit in delta connection for detecting the phase of a voltage between two conductors of the three-phase network after the fuses.
  • the respective phases before and after the fuses are compared with one another and a failure signal is emitted if a phase difference occurs or one or more phases are missing.
  • This circuit is also suitable for monitoring the connection of an electrical supply unit.
  • the invention is based on the object of specifying a device for monitoring the connection, which in particular reduces the hardware expenditure required for this. This task is solved by the features of the independent claim.
  • the device according to the invention for monitoring the connection of an electrical supply unit has one
  • Voltage detection which determines the phase voltages.
  • Current detection is also provided to determine the phase currents.
  • a transformation unit converts the phase currents into at least one cross current according to the theory of field-oriented regulation. According to the invention
  • a monitoring device which evaluates the course of the cross current for connection monitoring.
  • Field-oriented control is used in particular for servo drives. In the course of the field-oriented regulation, the necessary coordinate transformations of the phase sizes in transverse and longitudinal sizes are carried out.
  • connection monitoring can thus be done purely in software. Additional hardware is no longer necessary. This reduces the cost of the corresponding monitoring device.
  • the monitoring device for connection monitoring determines and evaluates the respective phase powers from the phase voltages and phase currents.
  • the sign of the resulting services is to be evaluated as an indication of whether and which phases have been interchanged and in which way.
  • the monitoring device evaluates the long current for connection monitoring.
  • the phase shift can be clearly detected by either + 120 ° or -120 ° using the slow current.
  • the slow current is already available as part of the field-oriented control, this evaluation ensures a low computing effort.
  • FIG. 2 shows the monitoring program, which runs in the device for connection monitoring, and the
  • Figures 3 to 8 typical curves of long-wave current and cross-current with associated DC link voltage with different connections of the three phases of a three-phase network.
  • the three phases U, V, W of a three-phase network (360 to 510 V; 50/60 Hz) are fed to a network connection unit 10 via a network connection 12.
  • Each of the three phases U, V, W is protected by a fuse 20.
  • the phase voltages Uu, Uv, Uw 14 are tapped and fed to a regulating and control block 34 of a supply unit 32.
  • This regulation and control block 34 supplies a first and a second protection control signal 16, 18 for controlling a charging protection 22 and a mains protection 24, which are integrated in the mains connection unit 10.
  • phase currents lu, Iv, Iw reach the respective choke connection points 28 as outputs of the network connection unit 10 via charging resistors 26 is finished. This is recognized by measuring the intermediate circuit voltage 46.
  • Commutation chokes 30 are now provided for each of the phases U, V, W, which are to be connected to the three choke connection points 28.
  • the other connections of the commutation chokes 30 are connected to the supply unit-side choke connections 36 of the supply unit 32.
  • the phase currents lu, Iv, Iw supplied via these choke connections 36 on the supply unit side are detected in the supply unit 32 and fed to the regulation and control block 34.
  • the output stage 40 is switched by output stage control signals 42 from the regulating and control block 34 in order to convert the fed three-phase AC voltage into a DC voltage for supplying an electric drive, for example.
  • This DC voltage is available as a DC link voltage 46 in a DC voltage intermediate circuit.
  • DC link capacitors 44 are provided to further smooth this voltage. The pending at the intermediate circuit capacitors 44
  • DC link voltage 46 is also supplied to the regulation and control block 34.
  • the regulation and control block 34 of the supply unit 32 is shown in more detail in FIG. 1b.
  • a voltage regulator 50 arranged in the regulating and control block 34 receives an intermediate circuit voltage setpoint 48 as input values and the intermediate circuit voltage 46 as an actual value. From this, the voltage regulator 50 determines a cross-current setpoint 52, which is supplied to both a current regulator 56 and a transformation and PWM conversion unit 60 as an input variable.
  • the phase voltages Uu, Uv, Uw 14 are fed to both a voltage transformation 74 and a reference angle generator 68.
  • the reference angle generator 68 determines the phase angle 67, which in turn is fed as an input variable to a current transformation 66 and the voltage transformation 74 as well as the transformation and PWM conversion unit 60.
  • the current transformation 66 generates, from the likewise supplied phase currents lu, Iv, Iw 38, according to the principles of field-oriented control, both a cross-current actual value 62 and a long-current actual value 64, which in addition to a long-current setpoint 54 serve the current controller 56 as input variables.
  • the current controller 56 provides the transformation and PWM conversion unit 60 with a transverse voltage setpoint 57 and a long voltage setpoint 59 as output variables.
  • the transformation and PWM conversion unit 60 is supplied with an actual transverse voltage value 70 and a long-voltage actual value 72, both of which are generated by the voltage transformation 74.
  • the transformation and PWM conversion unit 60 carries out a reverse transformation of the longitudinal and transverse components into the corresponding phase-related components and generates pulse-width-modulated control signals for the six transistors of the output stage 40.
  • the interface and control block 34 are supplied with external interface signals 19. That in the regulation and control block 32 current monitoring method for connection monitoring is shown in FIG. 2.
  • FIG. 3 shows the curves of the cross current (actual value) 62 and the slow current (actual value) 64 and the intermediate circuit voltage 46 as a function of time.
  • the intermediate circuit voltage 46 increases at the time of switching on with the course of an e-function.
  • the cross current 62 drops suddenly and then increases with the course of an e-function.
  • the slow current 64 oscillates around the zero line.
  • FIG. 3 shows the curves of the sizes mentioned with correct connection.
  • the phases U, V, W are cyclically offset by + 120 °, i. H. they were subsequently connected to V, W, U.
  • the connection sequence is W, V, U. Both cross current 62 and slow current 64 oscillate around the zero line and achieve both positive and negative values. This behavior can also be seen in FIGS. 7 and 8.
  • the phases W and V were interchanged (connection sequence: U, W, V), in Figure 8, the phases V and U (connection sequence: V, U, W).
  • the supply unit 32 is regulated in a field or network-oriented manner.
  • the detected phase current lu, Iv, Iw can, after conversion into a field-related orthogonal two-phase system (DQ coordinate system), into two components, namely cross current 62 and
  • Longitudinal stream 64 can be divided.
  • the slow current component 64 (reactive current component) builds up the reactive power of the supply unit 32 which is fed in or jerked off and is normally set to the value zero.
  • the cross current 62 is at right angles to the longitudinal current 64, is oriented in the same direction as the mains voltage and forms a measure of the active power fed in.
  • the supply unit 32 can be controlled in such a way that it rectifies the alternating voltage of the three-phase alternating voltage network into the intermediate circuit voltage 46 and uses this energy from the network to feed an electrical consumer, not shown, such as an inverter, which in turn supplies an electric motor.
  • the supply unit 32 comprises, for example, six controlled power transistors of the output stage 40, which are controlled by pulse width modulation, for example with a clock frequency of 8 kHz with a variable pulse width ratio.
  • the current transformation 66 provides the cross-current actual value 62 and the slow current actual value 64 in any case within the scope of the field-oriented control.
  • these components are now specifically evaluated for the detection of the network phase position.
  • the three phases U, V, W of a three-phase network are supplied to a network connection unit 10 in the correct phase in the manner provided.
  • the choke connection points 28 are to be connected for each phase U, V, W to the supply unit-side choke connections 36 in a correct manner via the commutation chokes 30 become.
  • a correct connection is shown in Figure la. However, there are now possibilities to interchange the network phase sequence with the network connection 12 due to incorrect connection.
  • the charging protection 22 is to be controlled in the sense of a closing via the external interface signal 19 in order to charge the intermediate circuit capacitor 44 via the charging resistors 26 serving to limit the current and the freewheeling diodes of the output stage 40.
  • the network protection 24 is open.
  • the regulation and control block 34 previously decides which control mechanism should be selected by comparing the intermediate circuit voltage 46 with a defined limit value (step 105 or step 107). If, for example, an intermediate circuit voltage 46 is less than 30% of the
  • step 107 the routine is started in step 107. If, on the other hand, an intermediate circuit voltage 46 greater than 30% of the intermediate circuit nominal voltage is detected (for example, the supply unit 32 was switched on and the intermediate circuit capacitors 44 are not yet fully discharged, or no charging current can flow after the charging protection 22 has been switched on), the routine proceeds according to step 105 started, or all three upper transistors 1.1, 1.3, 1.5 or all three lower 2.2, 2.4, 2.6 are controlled via the IGBT controls 42. This makes it more targeted via these transistors and charging resistors 26 for a time defined in the regulation and control block 34
  • step 107 the charging protection 22 is switched on and a check is made as to whether the mains current 38 (charging current or
  • phase currents lu, Iv, Iw 38 and the phase voltages Uu, Uv, Uw 14 are recorded for a predeterminable period of time and stored, for example, in digitized form.
  • the time profile of the cross current 62 and the long current 64 is also determined, as is the case, for example, in accordance with FIGS. 3 to 8.
  • Step 121 No instantaneous value of cross current 62 may be greater than zero. Only then is the criterion IQ ⁇ 0 fulfilled.
  • a further query 113 determines whether the phase-related powers Pu, Pv, Pw determined in step 107 are all greater than zero. Then it can be concluded that the phases are swapped cyclically either by + 120 ° or - 120 °. If this is the case, the time profile of the slow current 64 is evaluated in step 115. If one of the instantaneous values of the long current 64 is positive, this indicates a phase shift of + 120 °. In this case, the supply unit 32 was wired in the following manner: V, W, U. A corresponding message is output in step 129. The corresponding temporal behavior of the cross and longitudinal currents is shown in FIG.
  • connection sequence is: W, U, V. This corresponds to the time course of the currents in FIG. 5.
  • phase-related powers Pu, Pv, Pw it is determined which of the phase-related powers Pu, Pv, Pw is. If the power of phase U is greater than zero, as queried in step 117, this means that phases V and W are interchanged, the connection sequence is U, W, V. A corresponding message is generated in step 123. The associated current profiles are shown in FIG. 7. However, if the power of phase U is less than zero, a check is made in step 119 as to whether the power in phase V is positive. If this is the case, the following message is output in step 127: phases U and W are interchanged.
  • connection sequence now looks like this: W, V, U with the associated current profile according to FIG. 6. If the power in phase V is also not great zero, then The last possibility of error remains that the phases U and V are interchanged. The corresponding error message is generated in step 125.
  • the phase sequence is now V, U, W with the associated current profile shown in FIG. 8.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Rectifiers (AREA)

Abstract

La présente invention concerne un dispositif et un procédé pour surveiller la connexion d'une unité d'alimentation électrique. Ce procédé comprend une détection de tension (32), qui permet de déterminer une tension simple (14), et une détection de courant (32), qui permet de déterminer les courants de phase (38), au moyen d'une unité de transformation (66) qui transforme les courants de phase (38) selon le réglage orienté champ en au moins un courant transversal (62). Un dispositif de surveillance (34) analyse l'allure du courant transversal (62) afin de surveiller au moins une connexion d'alimentation (28, 36) qui permet l'alimentation d'une unité d'alimentation électrique (32).
EP02794725A 2001-08-14 2002-08-14 Dispositif et procede pour surveiller la connexion d'une unite d'alimentation electrique Withdrawn EP1419572A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10139860 2001-08-14
DE10139860A DE10139860A1 (de) 2001-08-14 2001-08-14 Vorrichtung und Verfahren zur Anschlussüberwachung einer elektrischen Versorgungseinheit
PCT/DE2002/003018 WO2003017460A1 (fr) 2001-08-14 2002-08-14 Dispositif et procede pour surveiller la connexion d'une unite d'alimentation electrique

Publications (1)

Publication Number Publication Date
EP1419572A1 true EP1419572A1 (fr) 2004-05-19

Family

ID=7695388

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02794725A Withdrawn EP1419572A1 (fr) 2001-08-14 2002-08-14 Dispositif et procede pour surveiller la connexion d'une unite d'alimentation electrique

Country Status (5)

Country Link
US (1) US7053626B2 (fr)
EP (1) EP1419572A1 (fr)
JP (1) JP4083120B2 (fr)
DE (1) DE10139860A1 (fr)
WO (1) WO2003017460A1 (fr)

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JP5420484B2 (ja) * 2010-07-02 2014-02-19 株式会社日立製作所 電力変換装置のゲートパルス誤配線検出方法
CN102005729B (zh) * 2010-12-10 2013-05-22 丹东华通测控有限公司 一种智能型电动机保护控制器自适应交流输入信号的方法
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Also Published As

Publication number Publication date
US20050134288A1 (en) 2005-06-23
DE10139860A1 (de) 2003-03-13
US7053626B2 (en) 2006-05-30
JP4083120B2 (ja) 2008-04-30
WO2003017460A1 (fr) 2003-02-27
JP2004538493A (ja) 2004-12-24

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