CN1169049A - Capacity judging apparatus of capacitor in power converter outputting three level voltage - Google Patents

Capacity judging apparatus of capacitor in power converter outputting three level voltage Download PDF

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Publication number
CN1169049A
CN1169049A CN97112735A CN97112735A CN1169049A CN 1169049 A CN1169049 A CN 1169049A CN 97112735 A CN97112735 A CN 97112735A CN 97112735 A CN97112735 A CN 97112735A CN 1169049 A CN1169049 A CN 1169049A
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CN
China
Prior art keywords
voltage
power converter
capacitor
amplitude
output
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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.)
Pending
Application number
CN97112735A
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Chinese (zh)
Inventor
仲田清
寺泽清
齐藤秀治
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Hitachi Ltd
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Hitachi Ltd
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Publication of CN1169049A publication Critical patent/CN1169049A/en
Pending legal-status Critical Current

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    • 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
    • H02H7/16—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 capacitors
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Protection Of Static Devices (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

The present invention discloses a capacitor capacitance-discriminating device of three-level converter, the capacitance of which can be discriminated stably with high accuracy without being affected by the condition of an external circuit. The device for setting and discriminating the drop in the capacitance of a voltage-dividing capacitor is used for comparing the detected alternating voltage fluctuation at an intermediate potential point of a voltage-dividing capacitor setted in the DC side of three-level converter with a reference value.

Description

The condenser capacity decision maker of three level power converters
The present invention relates to direct current is transformed to alternating current or alternating current is transformed to galvanic three level power converters; Relate in particular to the improvement that the voltage-dividing capacitor that is arranged on the converter DC side is safeguarded and protected.
Be arranged on the technology of the dc bus capacitor device capacity of power converter as detection, utilize the initial charge waveform when DC power supply is connected, measure capacitance by the Measuring Time constant, this technology is known.Nature, this technology can not be subjected to the restriction (two level, three level or more level) of power converter AC side voltage level number and be applied.
In above-mentioned routine techniques, use resistor because the charging interval of capacitor is depended on supply voltage or charging, thereby the accurate detection of external circuit condition becomes the prerequisite of high Precision Detection condenser capacity.
For example notification number be disclosed in the Japan Patent of 7-222436 (1995) a kind of by smmothing capacitor pulsating current or the method for voltage detecting capacitor aging (aged deterioration).But a plurality of ripple components produce in DC circuit, and this becomes the aging obstacle of accurate detection.
But the object of the present invention is to provide and a kind ofly do not depend on the external circuit condition and high stable and judge the device that three level power converter condenser capacities reduce exactly.
By providing the alternating voltage fluctuation that detects the intermediate potential point be arranged on three level power converter DC side voltage-dividing capacitors (below, be called neutral point) and, and achieve the above object the device of the testing result of this alternating voltage fluctuation with the fiducial value comparison.Thus, detect the alternating voltage fluctuation composition of the neutral point that is not subjected to the external circuit condition influence, when the amplitude of this voltage fluctuation composition surpasses pre-determined reference value, judge that promptly the direct current capacitor capacity reduces.
Fig. 1 is the schematic diagram of expression first embodiment of the invention.
Fig. 2 is the key diagram of action waveforms of the present invention.
Fig. 3 is the schematic diagram of expression second embodiment of the invention.
One embodiment of the invention is shown in Fig. 1, and Fig. 1 is the example that the present invention is applied to drive the three-level inverter of electric vehicle.
Among Fig. 1, the 1st, the direct voltage source that provides by stringing, 21, the 22nd, being used for voltage by direct voltage source 1 provides the neutral point voltage that is equivalent to alternating current side zero potential, is connected between P and the N point and carries out the voltage-dividing capacitor of dividing potential drop, and these voltage-dividing capacitors also can be used as the filtering capacitor of two-level inversion device DC side usually.30～33rd, have the rectifier cell of current stabilization work, switch element (adopt IGBT in the present embodiment, but also can adopt GTO, transistor etc.) that can self-extinction of arc, the 34, the 35th, obtain the auxiliary rectifier element of capacitor neutral point voltage.3a constitutes and the corresponding operating rocker of U, and 3b, 3c be respectively constituting the operating rocker that V reaches the W phase mutually with 3a the same manner, and the 4th, as the induction motor of inverter load device.
Operating rocker 3a to 3c can work alone separately mutually, and controls by the switching of switch element, produces the output voltage of three level at the interchange end of inverter.In addition, at publication number is that 51-47848 (1976) and publication number are the main circuit that discloses three-level inverter in the Japanese patent gazette of 56-74088 in detail, has disclosed pulse width modulation controlled in detail in publication number is the Japanese patent gazette of 05-146160 (1993).
In Fig. 1, the 5th, control circuit for pulse-width modulation, the frequency instruction Fi of its input inverter output voltage *, voltage instruction E *, voltage-dividing capacitor voltage e Cp, e Cn, and gating starting/stop signal GSS, thereby export the gate signal (open and close signal) that offers switch element 30～33.Here, voltage e Cp, e CnBe mainly used to control neutral point voltage, so that be applied to the voltage equalization on each voltage-dividing capacitor 21 and 22.
On the other hand, the 6th, as the condenser capacity decision circuit of principal character of the present invention.This circuit comprises: the memory 65 that detects the alternating component detector 61 of neutral point voltage alternating component, maximum value detector the 62, the 1st comparator the 63, the 2nd comparator 64 that detects described alternating component amplitude and record alternating voltage amplitude history.The 71st, the external indicator that the condenser capacity that warning is judged by first comparator reduces.The 72nd, the monitor of recorded data in the readout memory 65.Nature, indicating device 71 and monitor 72 can be arranged on the inside of described condenser capacity decision circuit 6 or control circuit for pulse-width modulation.
The work of power converter of the present invention is described as follows with reference to Fig. 1 and 2.
In three-level inverter, during driving, produce the alternately drift of treble frequency at the voltage neutral point with inverter output frequency.An example of action waveforms is shown in Fig. 2.As Fig. 2 (b) and (c), the voltage e of voltage-dividing capacitor CpAnd e CnAnti-phase mutually, and the output ripple with treble frequency of output voltage frequency.The amplitude Δ E of voltage fluctuation 0Determine by following formula. Δ E 0 = a · Im 3 2 π 2 Fi · C - - - - ( 1 )
Wherein: A is a modulation rate, and Im is inverter output current (a first-harmonic effective value), and Fi is an inverter frequency, and C is the capacity of voltage-dividing capacitor.
Amplitude Δ E 0Control variables, inverter frequency and condenser capacity by modulation rate (fundamental voltage amplitude of inverter output voltage with the average voltage of voltage-dividing capacitor normalized value), inverter output current are determined in addition.Δ E except DC power supply voltage and condenser capacity 0Irrelevant with the external circuit constant.Self-evident, if obtain Δ E 0, then also can obtain condenser capacity C at once.
The present invention has utilized these ins and outs of three-level inverter.In other words, in Fig. 1, detect contained alternating component in the neutral point voltage, detect the amplitude of alternating component by maximum value detector 62 by alternating component detector 61.This maximum value detector 62 has amplitude that not only detects alternating component but also the function that detects the maximum voltage amplitude under the driving condition that always changes.The 1st comparator 63 is testing result and the Δ E that is obtained by formula (1) 0The fiducial value 1 of permissible value compares and works as Δ E 0During greater than this fiducial value 1, in output CC1 output " 1 " (output " 0 " at ordinary times).When signal " 1 " was exported as CC1, indicating device 7 showed that a symbolic representation condenser capacity reduces.
Present embodiment has the effect that can not be subjected to the control of external circuit condition and stablize and detect exactly the condenser capacity reduction.
In addition, set the fiducial value 2 bigger than fiducial value 1 in the 2nd comparator 64, when the output of maximum value detector 62 surpassed fiducial value 2,64 outputs " 1 " of the 2nd comparator were as output CC2 (output " 0 " at ordinary times).As a result, gating startup/stop condition is fixed as gating to be stopped, and control circuit for pulse-width modulation stops to drive main circuit.Thus, can prevent the abnormal operation of inverter when condenser capacity reduces unusually in advance.
On the other hand, wherein record the not historical memory 65 of property point voltage interchange drift, can obtain the situation of condenser capacity change in long term, thereby may find easily that condenser capacity has certain capacitor that reduces danger by providing.Especially, can effectively reduce maintenance workload.
In the above-described embodiments, the present invention is applied to direct current is converted in the three-level inverter of interchange, but the present invention also can be applicable to interchange is converted in the three-level converter of direct current and expectation obtains effect same.
In the one pole modulation control that the voltage pulse train that is had identical polar by ac output voltage in the half period constitutes, the present invention especially has the characteristics that high accuracy is judged.
The 2nd embodiment of the present invention is shown in Fig. 3.Except the input signal of alternating component detector 61 becomes voltage-dividing capacitor voltage e CpWith e CnDifference this point outside, the 2nd embodiment is to embodiment illustrated in fig. 1 similar.In this embodiment, flip-flop contained in the input signal of alternating component detector 61 is very little, and alternating component can effectively detect.
According to the present invention, in three level power converters, the reduction of condenser capacity can be stablized and pin-point accuracy ground is judged.

Claims (4)

1. power converter that direct voltage is converted to the three-level AC stream voltage that comprises high potential, intermediate potential and electronegative potential, it is characterized in that comprising alternating voltage variation amplitude, judge the device of this voltage-dividing capacitor volume change according to the intermediate potential of the voltage-dividing capacitor that is arranged on described power converter DC side.
2. power converter as claimed in claim 1 is characterized in that, the third-harmonic component that the described alternating voltage of intermediate potential changes by the output frequency of the AC side of described power converter constitutes.
3. power converter as claimed in claim 1, it is characterized in that, further comprise signal of output and when this amplitude surpasses the 2nd fiducial value greater than described the 1st fiducial value, stop the device of described power converter running when described alternating voltage changes amplitude and surpasses the 1st fiducial value.
4. power converter as claimed in claim 1 is characterized in that further comprising: the storage device of the described change in voltage amplitude of scheduled store and according to the device of the aging signal of the described capacitor of described amplitude output expression.
CN97112735A 1996-06-14 1997-06-11 Capacity judging apparatus of capacitor in power converter outputting three level voltage Pending CN1169049A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP15369996A JP3173376B2 (en) 1996-06-14 1996-06-14 Apparatus for determining the capacitance of a capacitor of a three-level power converter
JP153699/96 1996-06-14

Publications (1)

Publication Number Publication Date
CN1169049A true CN1169049A (en) 1997-12-31

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CN97112735A Pending CN1169049A (en) 1996-06-14 1997-06-11 Capacity judging apparatus of capacitor in power converter outputting three level voltage

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JP (1) JP3173376B2 (en)
KR (1) KR980006703A (en)
CN (1) CN1169049A (en)
AU (1) AU690489B2 (en)
BR (1) BR9703583A (en)
ZA (1) ZA975118B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104143816A (en) * 2013-05-10 2014-11-12 穆尔芬根依必派特股份有限公司 Protective circuitry for insulation damage due to failure of intermediate circuit capacitors
CN107390042A (en) * 2016-05-03 2017-11-24 Abb技术有限公司 Monitor the method and electrical system of capacitance variations in electrical system
CN109347354A (en) * 2018-11-26 2019-02-15 合肥科威尔电源系统有限公司 Mid-point voltage Ripple Suppression device and method based on third-harmonic zero-sequence voltage
CN110380636A (en) * 2018-04-12 2019-10-25 株式会社东芝 The control method of power-converting device and power-converting device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6115312Y2 (en) * 1980-01-22 1986-05-13
FI120280B (en) 2008-01-21 2009-08-31 Switch High Power Converters O Method for monitoring the condition of DC capacitors

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4225912A (en) * 1978-12-22 1980-09-30 United Technologies Corporation Control for an auxiliary commutation circuit
CH667761A5 (en) * 1985-06-28 1988-10-31 Bbc Brown Boveri & Cie HIGH VOLTAGE DC VOLTAGE SOURCE.

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104143816A (en) * 2013-05-10 2014-11-12 穆尔芬根依必派特股份有限公司 Protective circuitry for insulation damage due to failure of intermediate circuit capacitors
CN104143816B (en) * 2013-05-10 2019-01-08 穆尔芬根依必派特股份有限公司 For leading to the protection circuit of insulation damages because of intermediate circuit failure
CN107390042A (en) * 2016-05-03 2017-11-24 Abb技术有限公司 Monitor the method and electrical system of capacitance variations in electrical system
CN110380636A (en) * 2018-04-12 2019-10-25 株式会社东芝 The control method of power-converting device and power-converting device
CN110380636B (en) * 2018-04-12 2021-09-14 株式会社东芝 Power conversion device and control method for power conversion device
CN109347354A (en) * 2018-11-26 2019-02-15 合肥科威尔电源系统有限公司 Mid-point voltage Ripple Suppression device and method based on third-harmonic zero-sequence voltage

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BR9703583A (en) 1998-07-07
JP3173376B2 (en) 2001-06-04
AU2370697A (en) 1998-01-08
JPH104626A (en) 1998-01-06
AU690489B2 (en) 1998-04-23
KR980006703A (en) 1998-03-30
ZA975118B (en) 1997-12-31

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