EP3283894A1 - Procédé pour tester un système onduleur ou un système convertisseur - Google Patents

Procédé pour tester un système onduleur ou un système convertisseur

Info

Publication number
EP3283894A1
EP3283894A1 EP15714534.3A EP15714534A EP3283894A1 EP 3283894 A1 EP3283894 A1 EP 3283894A1 EP 15714534 A EP15714534 A EP 15714534A EP 3283894 A1 EP3283894 A1 EP 3283894A1
Authority
EP
European Patent Office
Prior art keywords
inverter
direct current
input
testing
tested
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Withdrawn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
EP15714534.3A
Other languages
German (de)
English (en)
Inventor
Lorenz Feddersen
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.)
Wind & Sun Technologies SL
Original Assignee
Wind & Sun Technologies SL
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 Wind & Sun Technologies SL filed Critical Wind & Sun Technologies SL
Publication of EP3283894A1 publication Critical patent/EP3283894A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/40—Testing power supplies
    • G01R31/42—AC power supplies
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/40—Testing power supplies

Definitions

  • the present invention relates to a method for testing an inverter device for inverting direct current from direct current generators into alternating current, wherein the inverter device comprises a plurality of parallel direct current branches, each direct current branch having one
  • the invention further relates to a method for testing a power conversion device for converting alternating current from alternators.
  • Inverter devices for photovoltaic systems generally have a plurality of inverters connected in parallel, wherein a corresponding inverter is provided for each DC generator (solar cell array). If an inverter is repaired or replaced due to a defect, for example, it must be tested before restarting the system. Replacement or repair of an inverter is usually carried out on site by a service technician. However, if the appropriate service call lasts until the evening, when the sun has already set, the repaired or replaced inverter can not be tested because the solar power generator can no longer supply direct current. The repaired or replaced inverter can in such cases be tested the next morning at the earliest, causing additional downtime and significant additional costs.
  • DC generator is switched from an active, faultless inverter to another active, faultless inverter.
  • the object of the invention is to provide test methods in which additional downtime and costs are avoided after repair or replacement of an inverter or inverter.
  • DC DC source
  • DC DC source
  • the inverter device serves to feed solar power into an alternating voltage network
  • the alternating voltage source is advantageously formed by the alternating voltage network.
  • the AC source can be advantageously formed by a self-sufficient AC unit. This may preferably be a generator driven by an internal combustion engine, for example a diesel generator.
  • a controllable switching device connected between the DC inputs may be used to connect the DC inputs.
  • an electrically conductive, such as metallic bridge are set manually.
  • the faulty inverter and the other inverter are preferably disconnected from the inverter device.
  • connection of the DC inputs can be reopened exclusively by intervention of a service technician at the location of the inverter device. This prevents inadvertent opening of the connection before a field service technician has tested the functionality of the replaced or repaired inverter.
  • the invention includes hybrid systems with different types of direct current generators, in particular solar power generators and energy storage devices, for example batteries.
  • direct current generators in particular solar power generators and energy storage devices, for example batteries.
  • the inverter At relative high solar power are preferably one or more of the inverter for charging the energy storage or in the reverse direction operated as a rectifier.
  • the inverters At relatively low solar power, are preferably operated to deliver stored in the energy storage or the energy to an AC network.
  • a variant of the invention relates to a method for testing a converter device for converting alternating current from alternators, for example different generator windings of a wind turbine, wherein the power converter device comprises a plurality of parallel AC branches, each AC branch having an inverter and an AC input for connection to one of the alternators.
  • the invention is characterized in that, for testing one of the inverters, the AC input of the converter to be tested is connected to the AC input of another inverter and operated in the reverse direction to convert alternating current from an AC source and into the AC input of the one to be tested Feed inverter.
  • 1, 2 a schematic circuit diagram for a photovoltaic system in different embodiments of the invention.
  • Fig. 3 is a schematic circuit diagram for a wind turbine in an embodiment of the invention.
  • the photovoltaic system 10 according to FIG. 1 comprises a plurality of direct current generators 13, 14, in particular solar power generators, and an inverter device 15 for reversing the direct current generated by the direct current generators 13, 14 into alternating current.
  • Each solar power generator 13, 14 comprises at least one solar cell panel or solar panel. In general, each solar power generator 13, 14 contains a plurality of solar cells or photovoltaic cells.
  • the inverter device 15 comprises a plurality of inverters 11, 12 as central components. Each inverter 11, 12 is connected to a corresponding direct current input 18, 19 by means of lines which form corresponding DC branches 16, 17. At each DC input 18, 19, a corresponding DC generator 13, 14 can be connected. After the direction of change by the inverters 11, 12, the generated alternating current is output via one or more alternating current outputs 20, for example to an alternating current network 50, alternating current consumer and / or alternating current storage. On the DC and the AC side of each inverter 11, 12, a controllable switch 21, 22 and 23, 24 is arranged in order to separate the inverters 11, 12, for example, in the event of a defect individually from the inverter device 15.
  • the two DC branches 16, 17 and the two DC inputs 18, 19 are connected to each other by means of a controllable switch 25 via a bridge 47.
  • the switch 25 is bipolar, i. it switches both the positive pole of the DC branches 16, 17 by means of a switch element 27 and the negative pole by means of a switching element 26, wherein the
  • Switching elements 26, 27 are preferably coupled.
  • the scarf ter 21 to 25 and the inverters 11, 12 are manually operable and / or controlled by an electronic control device 28.
  • the electronic control device 28 is for example a signal or microprocessor and may be arranged in the inverter device 15 or generally at a suitable location in the photovoltaic system 10.
  • the electronic control device 28 is also configured to measure or detect a fault in one of the inverters 11, 12.
  • the electronic control device 28 is connected via a remote monitoring connection 29 to a remote maintenance center 30 remote from the photovoltaic system 10.
  • DC generator 13 generated direct current is passed through the DC input 18 and the DC branch 16 to the inverter 11, where it is directed in AC and passed to the AC output 20.
  • the direct current generated by the direct current generator 14 is fed via the DC input 19 and the DC branch 17 to the inverter 12, where it is directed in alternating current and passed to the AC output 20.
  • the controller 28 detects a fault or fault in one of the inverters 11, 12, it will be repaired or replaced on-site by a service technician. It is assumed here without limitation that the inverter 12 is repaired or replaced.
  • the respective inverter 12 upstream and downstream switches 23 and 24 are thereby opened to separate the respective inverter 12 on both sides, ie on the DC and on the AC side of the inverter device 15.
  • the switches 23, 24, 25 are closed by the service technician on site. This can be done manually or via an operator terminal for controlling the control device 28. Subsequently, the other inverter 11 is driven so that it acts as a rectifier for test purposes.
  • alternating current is taken from the alternating current network 50, rectified by the power converter 11 and fed via the bridge 47 into the direct current input 19 and the direct current path 17 of the inverter 12 to be tested.
  • the injected DC is reversed by the inverter 12 and can then be fed back into the AC mains 50. If the direction of change by the inverter 12 is functioning properly, the inverter 12 is free of errors and the normal operation of the system 10 can be resumed.
  • the switch 25 is opened and the power converter 11 is again driven to operate as an inverter 11.
  • the electric energy is circulated from the AC mains 50 via the inverter 11, the bridge 47 and back across the inverter 12 to be tested to the AC side 20 at full power.
  • the inverter 11 serves as an AC power source to simulate power consumption from the DC generator 14 and the inverter 12 to be tested as an AC sink, i. as inverter in normal operating mode.
  • the opening or separation of the switch 25 is preferably carried out by a service technician Place. Alternatively, it can also be triggered via the remote monitoring connection 29.
  • a bridge 47 may be provided without switch 25, which is set manually for the test procedure and then removed again.
  • the bridge 47 here consists of two connectors 48, 49 for connecting the two plus inputs DC + and for connecting the two minus inputs DC- the inverter 11, 12.
  • the switches 21 to 24 opened for safety reasons to the testing inverter 12 and the other inverter 11 from the inverter device 15 to separate.
  • the connectors 48, 49 via two contacts 46, such as screw, connected to the DC power lines DC +, DC-.
  • the connectors 48, 49 may be metal rails or cables, for example.
  • the switches 21 to 24 are closed and the other inverter 11 is operated as a rectifier, as described above for the figure 1.
  • the bridge 47 To disconnect the bridge 47, at least one of the connectors 48, 49, advantageously both connectors 48, 49 are removed from the DC lines DC +, DC- by releasing the contacts 46.
  • the embodiment according to FIG. 2 is particularly advantageous in installations 10 without switch 25, since no time-consuming retrofitting is required.
  • the embodiments of Figures 1 and 2 are easily transferable to the general case of more than two inverters.
  • the DC input of an inverter to be tested is connected to the DC input of another inverter as described above and operated the other inverter as a rectifier.
  • the embodiments according to FIGS. 1 and 2 are easily transferable to alternating current generators 33, 34 instead of direct current generators 13, 14.
  • the power conversion device 35 includes a plurality of parallel AC branches 36, 37, each AC leg 36, 37 having an inverter 31, 32 and an AC input 38, 39 for connection to one of the alternators 33, 34.
  • the alternators 33, 34 may be, for example, different windings of the generator of a wind turbine 40.
  • the bridge 47 is set to connect the AC input 39 of the inverter under test 32 to the AC input 38 of the other inverter 31.
  • the other inverter 31 is then operated in the reverse direction to convert alternating current from the AC voltage source 50 and feed it into the AC input 19 of the inverter 32 to be tested.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

L'invention concerne un procédé pour tester un système onduleur (15) servant à transformer le courant continu issu de générateurs de courant continu (13, 14) en courant alternatif, le système onduleur (15) comprenant une pluralité de branches CC en parallèle (16, 17), chaque branche CC (16, 17) comportant un onduleur (11, 12) et une entrée CC (18, 19) destinée à être reliée à un des générateurs de courant continu (13, 14), caractérisé en ce que, pour tester un des onduleurs (11, 12), on relie l'entrée CC (18, 19) de l'onduleur à tester (11, 12) à l'entrée CC (19, 18) d'un autre onduleur (12, 11) et on fait fonctionner ce dernier en sens inverse comme un redresseur afin de redresser le courant alternatif issu d'une source de courant alternatif et de l'injecter dans l'entrée CC (18, 19) de l'onduleur à tester (11, 12).
EP15714534.3A 2015-04-13 2015-04-13 Procédé pour tester un système onduleur ou un système convertisseur Withdrawn EP3283894A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2015/057969 WO2016165735A1 (fr) 2015-04-13 2015-04-13 Procédé pour tester un système onduleur ou un système convertisseur

Publications (1)

Publication Number Publication Date
EP3283894A1 true EP3283894A1 (fr) 2018-02-21

Family

ID=52814124

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15714534.3A Withdrawn EP3283894A1 (fr) 2015-04-13 2015-04-13 Procédé pour tester un système onduleur ou un système convertisseur

Country Status (3)

Country Link
US (1) US20180136289A1 (fr)
EP (1) EP3283894A1 (fr)
WO (1) WO2016165735A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108132397B (zh) * 2017-12-11 2020-10-30 中车大连机车研究所有限公司 一种变流器的测试系统

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6800964B2 (en) 2002-06-10 2004-10-05 Bernhard Beck Plural configurable DC sources to provide optimal power to plural configurable inverters
JP4158454B2 (ja) * 2002-08-23 2008-10-01 トヨタ自動車株式会社 インバータ試験装置、インバータの試験方法及びインバータの製造方法
FR2959365B1 (fr) * 2010-04-26 2012-04-20 Mge Ups Systems Dispositif convertisseur et alimentation sans interruption equipee d'un tel dispositif
US9577424B2 (en) * 2010-07-16 2017-02-21 Rockwell Automation Technologies, Inc. Parallel motor drive disable verification system and method
US20130258732A1 (en) * 2012-03-27 2013-10-03 General Electric Company System and method for reducing reactive current in power converter burn-in tests

Also Published As

Publication number Publication date
WO2016165735A1 (fr) 2016-10-20
US20180136289A1 (en) 2018-05-17

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