WO2003075430A1 - Alimentation non interruptible - Google Patents

Alimentation non interruptible Download PDF

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Publication number
WO2003075430A1
WO2003075430A1 PCT/JP2003/002273 JP0302273W WO03075430A1 WO 2003075430 A1 WO2003075430 A1 WO 2003075430A1 JP 0302273 W JP0302273 W JP 0302273W WO 03075430 A1 WO03075430 A1 WO 03075430A1
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WO
WIPO (PCT)
Prior art keywords
power supply
voltage
input
parallel converter
power
Prior art date
Application number
PCT/JP2003/002273
Other languages
English (en)
Japanese (ja)
Inventor
Isao Amano
Masanobu Fujikura
Original Assignee
Fuji Electric Co., Ltd.
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 Fuji Electric Co., Ltd. filed Critical Fuji Electric Co., Ltd.
Priority to AU2003211808A priority Critical patent/AU2003211808A1/en
Publication of WO2003075430A1 publication Critical patent/WO2003075430A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1807—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators
    • H02J3/1814—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators wherein al least one reactive element is actively controlled by a bridge converter, e.g. unified power flow controllers [UPFC]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/10—Flexible AC transmission systems [FACTS]

Definitions

  • the present invention provides an uninterruptible power supply that supplies input power from an AC power supply or the like to a load, and supplies power to the load using energy stored in power storage means when the AC power supply or the like fails.
  • an uninterruptible power supply for example, as shown in Fig. 8, a parallel converter connected in parallel to a power supply line for supplying input power supplied from a commercial power supply to a load
  • an uninterruptible power supply comprising: a series inverter having a power side connected in series to a power supply line;
  • a compensation circuit 10 is connected to a power supply line LN for supplying input power to a load.
  • the compensation circuit 10 includes a parallel converter 12 having a rectifying function, an active filter function, and an inverter function, a battery 14, a capacitor 16, and a series inverter 18 connected in parallel in this order. It is configured.
  • the AC power side of the parallel converter 12 is connected in parallel via a reactor L 1 between a capacitor C 1 connected in parallel to the power supply line LN and a power supply line LN, and the reactor L 1 and capacitor C1 make up the LC filter.
  • the AC output side of the series inverter 18 is connected to the It is connected in series via a series transformer # 9 between the connection point with the capacitor C1 and the output terminal P out. Further, between the series transformer 19 and the output terminal P out, a capacitor C2 constituting a leakage inductance of the series transformer 19 and an LC filter is connected in parallel to the power supply line LN.
  • the input voltage from the commercial power supply or the like input to the input terminal Pin of the power supply line LN is monitored, and when the input voltage is within the allowable range in which the preset input voltage can be regarded as normal, the input voltage is Judge as normal, and control the series inverter 18 so that the output voltage of the output terminal P out becomes the specified voltage, and keep the output voltage to the load at the specified voltage.
  • the parallel converter 12 is operated as an active filter to reduce harmonics flowing from the input terminal Pin to the side of commercial power supply, etc., and to perform rectification as needed, to charge the battery 14 I do.
  • the power supply switch SW is turned on. Shut off to disconnect the commercial power supply from the power supply line LN, and operate the parallel converter 12 as a backup.
  • the parallel converter 12 is operated in reverse to generate AC power of a predetermined voltage in place of a commercial power supply or the like, and supplies this to the load.
  • the series inverter 18 is continuously controlled in the same manner so that the output voltage to the load becomes the specified voltage.
  • a predetermined power supply can be continuously performed to the load even when an abnormality occurs in the commercial power supply or the like.
  • the power supply switch SW is shut off.However, the input voltage actually becomes an abnormal value. After the power supply switch SW is actually turned off and the commercial power supply is disconnected from the power supply line LN, it takes several A time delay occurs.
  • the parallel converter 12 is controlled to perform the backup operation by detecting the drop of the input voltage, and the parallel converter 12 is turned off. Even if it operates as an inverter, an excessive current flows through the short-circuited portion via the power supply switch SW until the power supply switch SW is actually turned off, so the parallel converter 12 Cannot be maintained.
  • the series inverter 18 performs correction so that the output voltage to the load becomes the specified voltage, the output voltage must be maintained at the specified voltage because the range that can be corrected is limited. However, the output voltage to the load decreases, resulting in a problem that the voltage temporarily drops and an instantaneous power failure occurs.
  • the parallel converter 12 when the parallel converter 12 is operated as an active filter, a complicated operation is required to calculate a harmonic component. Also, since the active filter needs to change its output current steeply, the parallel converter 12 and the control device for controlling the same require a command value for changing the output current of the parallel converter 12 steeply. There is a problem that high current control performance is required, which can follow the current. '
  • An object of the present invention is to provide an uninterruptible power supply capable of reducing the processing load of processing and removing harmonic components without requiring advanced processing performance
  • the invention of claim 1 is interposed in a power supply line and A power supply switch composed of two thyristors connected in antiparallel, a parallel converter connected in parallel between the power supply switch and the output end of the power supply line, and a power storage means connected to the parallel converter A series transformer connected in series between a connection point of the power supply line with the parallel converter and the output terminal, and an AC output voltage of the output terminal connected to the series transformer and having a predetermined value.
  • a series inverter that adjusts the AC output voltage using the power storage unit as an energy source, a voltage abnormality detection unit that detects an input voltage abnormality of AC power input to an input terminal of the power supply line, Control means for controlling the power supply switch and the parallel converter in accordance with the detection result of the voltage abnormality detection means, wherein the control means comprises: When no abnormality is detected in step (a), the power supply switch is controlled so that a thyristor through which a current having the same polarity as the input voltage to the input terminal is ignited, and the parallel converter is controlled to control the power storage means.
  • the current flowing through the parallel converter is adjusted so that the energy becomes a specified value and the input power factor of the AC power input to the input terminal becomes 1, and when the voltage abnormality detecting means detects an abnormality,
  • the power supply switch is controlled to be cut off, and the parallel converter is controlled so as to output AC power of a predetermined voltage to the power supply line using the power storage means as an energy source.
  • the power supply switch inserted in the power supply line for supplying AC power to the load is constituted by a thyristor connected in anti-parallel, and the input voltage of the input terminal to the input terminal of the power supply line is reduced.
  • the two thyristors are alternately turned on and off in accordance with the polarity of the input voltage so that the thyristor that allows the current of the same polarity to be turned on is turned on. Controlled to be "1". Note that this power factor does not necessarily have to be “1”, and the thyristor that is turned on according to the polarity of the input voltage is turned on due to the large phase difference between the input current and voltage.
  • the parallel converter connected in parallel to the power supply line outputs AC power of a predetermined voltage.
  • the series inverter connected to the power supply line via a series transformer operates so that the AC output voltage to the load becomes a predetermined value.
  • the invention according to claim 2 includes a power supply switch inserted in a power supply line, a parallel converter connected in parallel between the power supply switch and an output end of the power supply line, A power storage means connected thereto, a series transformer connected in series between a connection point of the power supply line with the parallel converter and the output terminal, and an AC output voltage connected to the series transformer and at the output terminal.
  • a series inverter that adjusts the AC output voltage using the power storage means as an energy source so as to have a predetermined value, and a connection point between the power supply line and the parallel converter and the power supply switch.
  • An input reactor voltage abnormality detection means for detecting an input voltage abnormality of AC power input to an input end of the power supply line, and the power supply according to a detection result of the voltage abnormality detection means.
  • Control means for controlling the switch and the parallel converter, wherein the control means controls conduction of the power supply switch when the voltage abnormality detection means does not detect an abnormality, and controls the parallel converter. Controlling the current flowing through the input reactor so that the energy of the power storage means becomes a specified value.
  • the power supply switch is cut off and the power storage means is controlled.
  • the parallel converter is controlled so as to output high-voltage AC power to the power supply line.
  • the parallel converter is controlled so that, for example, the current flowing through the input reactor becomes a sinusoidal current, and the AC power from a commercial power supply or the like is balanced with the power supplied to the load.
  • the current flowing through the input reactor is controlled such that the energy of the power storage means becomes a specified value.
  • the current flowing through the input reactor is controlled to be sinusoidal, so if the output current to the load contains harmonic components, the harmonic current will flow to the parallel converter, It does not leak to the commercial power supply.
  • the parallel converter operates as an inverter to generate AC power.
  • the input reactor is interposed between the parallel converter of the power supply line and the power supply switch, the AC current generated by the parallel converter is suppressed from flowing to the commercial power supply or the like.
  • the output voltage is corrected by the series inverter so that the output voltage becomes the command value, the output voltage to the load does not enter an instantaneous blackout state, and the output voltage is maintained at the command value.
  • the invention according to claim 3 is characterized in that a power supply switch composed of two thyristors inserted in a power supply line and connected in antiparallel is connected in parallel between the power supply switch and an output terminal of the power supply line.
  • the input relay inserted between the point and the feed switch A voltage abnormality detecting means for detecting an input voltage abnormality of AC power input to an input terminal of the power supply line; a power supply switch and the parallel compensator according to a detection result of the voltage abnormality detection means; And a control means for controlling the control means, when the voltage abnormality detection means does not detect an abnormality, the control means is configured to ignite a thyristor through which a current having the same polarity as an input voltage to the input terminal is ignited.
  • the power supply switch is cut off and controlled to a predetermined voltage by using the power storage means as an energy source. It is characterized by controlling the parallel converter evening to output flow power to the power supply line.
  • the parallel converter is controlled so that, for example, the current flowing through the input reactor is substantially a sine-wave current having a power factor of “1”, and AC power from a commercial power supply or the like is supplied to the load.
  • the current flowing through the input reactor is controlled so that the energy of the power storage means becomes a specified value.
  • the current flowing through the input reactor is controlled to be sinusoidal, so if the output current to the load contains a harmonic component, the harmonic current will flow to the parallel converter. It does not flow to the commercial power supply.
  • the feed switch inserted in the feed line for supplying AC power to the load is composed of a thyristor connected in anti-parallel, and has the same polarity as the polarity of the input voltage to the input end of the feed line.
  • the two thyristors are alternately turned on and off in accordance with the polarity of the input voltage so that the thyristor through which the current flows is turned on.At this time, the current flowing through the input reactor is controlled by the parallel comparator.
  • the rate is controlled to be "1". This power factor must always be "1".
  • the thyristor which is turned on according to the polarity of the input voltage, is automatically turned off despite the fact that it is turned on due to the large phase difference between the input current and the voltage. Any power factor may be used as long as the power factor can be avoided.
  • the parallel converter connected in parallel to the power supply line operates to output AC power of a predetermined voltage, and the power supply line
  • the series inverter connected via a series transformer operates so that the output voltage to the load becomes a predetermined value, and if the input voltage decreases, the When the reverse bias is applied to the thyristor, the thyristor automatically turns off, so even if the input voltage drops due to a power failure or the like, the output voltage to the load will be instantaneous. A stop condition is avoided, and the output voltage is maintained at a predetermined value.
  • FIG. 1 is a circuit diagram illustrating an example of the uninterruptible power supply according to the first embodiment of the present invention.
  • FIG. 2 is a block diagram showing a functional configuration of the AC switch control unit 22 of FIG.
  • FIG. 3 is a block diagram showing a functional configuration of the parallel converter overnight controller 24 of FIG.
  • FIG. 4 is a block diagram showing a functional configuration of the serial inverter controller 26 of FIG.
  • FIG. 5 is a circuit diagram illustrating an example of the uninterruptible power supply according to the second embodiment of the present invention.
  • FIG. 6 is a block diagram showing a functional configuration of the parallel converter overnight controller 24a of FIG. is there. '
  • FIG. 7 is a circuit diagram illustrating an example of the uninterruptible power supply according to the third embodiment of the present invention. '
  • FIG. 8 is a circuit diagram showing an example of a conventional uninterruptible power supply. Explanation of reference numerals
  • FIG. 1 is a circuit diagram illustrating an example of the uninterruptible power supply according to the first embodiment.
  • an AC switch 5 is provided on the power supply line LN between the input terminal Pin connected to a commercial power supply or the like and the output terminal Pout connected to the load, and the AC switch 5 and the output terminal Pout Is connected to the compensation circuit 10.
  • the AC switch 5 includes a pair of thyristors 5a and 5b connected in anti-parallel.
  • the compensation circuit 10 includes a parallel converter 12, a battery 14, a capacitor 16, and a series inverter 18 in this order, in the same manner as the conventional uninterruptible power supply shown in FIG. It is configured to be connected to.
  • the parallel converter The evening 12 and the series inverter 18 are each formed of a known full-bridge circuit in which, for example, a switching element and a diode connected in anti-parallel to each other are connected in series two by two.
  • the AC power side of the parallel converter 12 is connected via a reactor L1 between a connection point between a capacitor C1 connected in parallel to the power supply line LN and a capacitor C1 of the power supply line LN.
  • the reactor L1 and the capacitor C1 constitute an LC filter.
  • the AC output side of the series inverter 18 is connected to an isolation transformer in which a secondary winding is inserted between a connection point of the power supply line LN and the capacitor C1 and an output terminal P out. Connected to the power supply line LN via a series transformer 19. Further, a capacitor C2 is connected in parallel to a power supply line LN between the series transformer 19 and the output terminal Pout, and an LC filter is formed by the capacitor C2 and the leakage inductance of the series transformer 19. Make up.
  • the AC switch 5, the parallel converter 12 and the serial inverter 18 are driven and controlled by a control circuit 20.
  • the control circuit 20 controls an AC switch control unit 22 that drives and controls the AC switch 5, a parallel converter control unit 24 that controls the parallel converter 12 and a serial converter 18 that controls the series inverter 18. And a serial receiver 26.
  • FIG. 2 is a block diagram showing a functional configuration of the AC switch control unit 22.
  • the AC switch control unit 22 detects a comparator 22a and a rising edge of an output signal of the comparator 22a.
  • a falling edge detector 22c for detecting a falling edge of the output signal of the comparator 22a.
  • the non-inverting input terminal of the comparator 22a has an input voltage detector 32 connected to a power supply line LN between the input terminal Pin and the AC switch 5 and detecting an input voltage from a commercial power supply or the like.
  • the detected input voltage Vin is applied, and the inverted input terminal A reference voltage for detecting the phase of the input voltage Vin is applied to the element.
  • the comparator 22a outputs a HIGH-level signal when the input voltage is higher than the reference voltage, and outputs a LOW-level signal when the input voltage is lower than the reference voltage.
  • the rising edge detector 22b detects the current flowing from the input terminal Pin to the output terminal Pout of the AC switch 5.
  • Control thyristor 5a which allows flow, to the on state.
  • the falling edge detector 22c detects the falling edge of the output signal of the comparator 22a
  • the falling edge detector 22c outputs a signal from the output terminal Pout to the input terminal Pin of the AC switch 5.
  • the thyristor 5b that allows current flow is controlled to the ON state. That is, the AC switch control section 22 turns on and off the thyristors 5a and 5b alternately in accordance with the polarity of the input voltage Vin.
  • FIG. 3 is a block diagram showing a functional configuration of the parallel converter control unit 24.
  • a voltage adjustment operation such as PI control is performed in the voltage adjuster 42, and the operation result is multiplied by the reference sine wave signal sincot by the arithmetic unit 43.
  • the reference sine wave signal s incot is a signal whose phase is synchronized with the input voltage Vin, and the amplitude thereof is set arbitrarily. Set to the corresponding value.
  • a difference value between the calculation result of the calculator 43 and the calculation result of the harmonic component extraction calculator 44 is calculated by the calculator 45.
  • the harmonic component extraction / calculation unit 44 uses a known procedure. Therefore harmonic Extract wave components.
  • the difference between the difference value calculated by the arithmetic unit 45 and the parallel converter current Ipara, which is the current flowing through the parallel converter 12 and detected by the parallel converter current detector 38, is calculated by the arithmetic unit 46. Is calculated.
  • the reference sine wave signal sinwt is a signal whose phase is synchronized with the input voltage Vin, and its amplitude is set according to, for example, the rated voltage to the load.
  • a pulse signal is generated in the PWM control section 50 based on the addition result.
  • the parallel converter 12 is operated to perform a rectifying operation and an active fill operation so that the DC voltage E dc matches the DC voltage command value E dc *, and the input power factor becomes substantially “1”.
  • a pulse signal is generated, and the switching elements of the parallel converter 12 are controlled based on the pulse signal.
  • the current value flowing through the parallel converter 12 necessary to match the DC voltage E dc with the DC voltage command value E dc * and the parallel converter 1 2 required to cancel the harmonic components of the output current
  • the feedback control is performed so that the sum of the current value and the parallel converter current I par a is calculated.
  • the input power factor is desirably “1”, but is not necessarily “1”.
  • the thyristors 5a and 5b of the AC switch 5 are controlled according to the polarity of the input voltage, if the input power factor is not "1", the current flowing through the thyristor that is turned on is controlled. When the value becomes zero, the thyristor is automatically turned off, and the current stops flowing thereafter. Therefore, it is sufficient that the power factor is such that this can be avoided. If the phase difference between the input voltage and the input current is about 30 °, that is, if the power factor is about 0.866 or more, If you have No.
  • the cutoff switch 48 is turned on when the input voltage Vin detected by the input voltage detector 32 is within a preset allowable range in which the input voltage can be regarded as normal.
  • the input voltage exceeds the permissible range, that is, when the input voltage exceeds or falls below the permissible range, it is controlled to be in a cutoff state as a voltage abnormality.
  • a pulse signal for operating the parallel converter 12 in an inverting mode is generated based on, for example, a reference sine wave signal sinot according to the rated voltage to the load. 2 controls each switching element. That is, feedforward control is performed according to the reference sine wave signal sinwt.
  • FIG. 4 is a block diagram showing a functional configuration of the serial inverter control unit 26.
  • the difference between the preset output voltage command value Vout * to the load and the output voltage Vou ⁇ to the load detected by the output current voltage detector 36 is calculated by the arithmetic unit 5 1 Based on this difference value, for example, voltage adjustment calculation such as PI control is performed by the voltage adjuster 52, and based on this, the PWM controller 53 causes the series inverter 18 to operate as an inverter. Is generated, and each switching element of the serial inverter 18 is controlled. That is, feedback control is performed so that the output voltage Vout becomes the output voltage command value Vout *.
  • the serial inverter control section 26 performs the inverter operation irrespective of whether or not the input voltage is abnormal.
  • the input voltage detector 32 detects it. Since the input voltage Vin falls within the allowable range, the control circuit 20 determines that the input voltage from the commercial power supply is normal. Therefore, the AC switch control unit 22 alternately controls the thyristors 5a and 5b to the conducting state according to the phase of the input voltage Vin.
  • the power supplied from the commercial power supply or the like is supplied to the load via the AC switch 5, and the series inverter controller 26 sets the output voltage Vout to the load to be the output voltage command value Vout *.
  • the DC power of the battery 14 and the capacitor 16 is changed to AC power, which is applied in series to the power supply line LN via the series transformer 19, The output voltage Vout to the load will be maintained at the output voltage command value Vout *.
  • the parallel converter control unit 24 extracts the harmonic components included in the output current l out to the load, and outputs the parallel converter current I para and the output current I out
  • the rectifying operation of the parallel converter 12 and the active filter operation are performed so that a current value corresponding to a harmonic component of the capacitor 16 and a voltage value that allows the voltage E dc across the capacitor 16 to be a DC voltage command value E dc * are obtained. Let me do it. As a result, the battery 14 is charged, and the harmonic component generated in the load is absorbed by the parallel converter 12, so that the harmonic current does not flow out to the commercial power supply.
  • the control circuit 20 determines that the input voltage is abnormal when the input voltage Vin exceeds the allowable range.
  • the series inverter control unit 26 continues to control the series inverter 18 in the same manner as before so that the output voltage Vout is changed to the output voltage command value V Performs an inverting motion to keep out *.
  • the cutoff switch 48 was controlled to be in the cutoff state, and the specified voltage corresponding to the normal input voltage was controlled based on the reference sine wave signal sinwt. To control the parallel compiler 1 and 2 to generate. As a result, the DC power of the battery 14 and the capacitor 16 is converted into AC power and supplied to the load via the power supply line LN.
  • the thyristor of which the conduction is controlled among the thyristors constituting the AC switch 5 is at the time when the reverse bias is applied as the input voltage decreases.
  • the parallel converter 12 is controlled to operate overnight.
  • the other thyristor is controlled to be cut off, when the reverse bias is applied to the thyristor whose conduction is controlled, the input terminal Pin side of the AC switch 5 is connected to the power supply line LN. Will be disconnected from
  • the parallel converter 12 when the parallel converter 12 is switched from the rectifying operation and the active filter operation to the backup operation, the input terminal Pin side is already disconnected from the power supply line LN, so that the input terminal Pin becomes excessive through the short circuit. No current flows, and the parallel converter 12 generates AC power of a predetermined voltage and supplies it to the load side. Therefore, it is possible to prevent the output voltage Vout to the load from being in an instantaneous blackout state.
  • the AC switch 5 is composed of a thyristor and is alternately turned on and off in synchronization with the polarity of the input voltage Vin.
  • the parallel converters 1 and 2 are operated as active filters and the input power factor is controlled to be "1"
  • the flow of harmonic current to the commercial power supply is suppressed.
  • FIG. 5 is a circuit diagram illustrating an example of an uninterruptible power supply according to the second embodiment.
  • the power supply line LN is provided with the relay switch 6, and the AC power input to the input terminal Pin is supplied to the load from the output terminal Pout via the relay switch 6. It has become.
  • An input reactor Lin is inserted between the relay switch 6 of the power supply line LN and the output terminal Pout, and a capacitor C1 is connected to the power supply line LN between the input reactor Lin and the relay switch 6.
  • the LC filter is composed of the input reactor Lin and capacitor C1 connected in parallel.
  • a compensation circuit 10 configured in the same manner as in the first embodiment is connected to the power supply line LN between the input reactor Lin and the output terminal Pout, and the AC power of the parallel converter 12 of the compensation circuit 10 is Is connected between the input reactor Lin and the output terminal Pout, and the AC power side of the series inverter 18 is connected to the power supply line LN via the series transformer 19 as in the first embodiment.
  • a capacitor C2 is connected in parallel to the power supply line LN between the series transformer 19 and the output terminal Pout, and an LC filter is configured by the leakage inductance of the series transformer 19 and the capacitor C2.
  • the control circuit 20 controls the driving of the relay switch 6, the parallel converter 12, and the serial inverter 18.
  • the control circuit 20 includes a relay switch control unit 23 that controls the drive of the relay switch 6, a parallel converter control unit 24a that controls the parallel converter 12, and a serial driver. Evening 18 is the first form of implementation A series inverter control unit 26 for controlling in the same manner as in the first embodiment is provided.
  • the relay switch control unit 23 includes: The relay switch 6 is controlled to be in a conductive state, and when the input voltage Vin exceeds the allowable range, it is considered that the input voltage is abnormal, and the relay switch 6 is controlled to be in a cut-off state.
  • FIG. 6 is a block diagram showing a functional configuration of the parallel converter overnight controller 24a.
  • the difference between the DC voltage command value E dc *, which is the target value of the DC voltage across capacitor 16, and the voltage across capacitor 16 detected by charging voltage detector 34 is Detected by arithmetic unit 61.
  • a voltage adjustment operation such as PI control is performed in the voltage adjuster 62, and the operation result is multiplied by the reference sine wave signal sincot by the arithmetic unit 63.
  • the reference sine wave signal sincot is a signal whose phase is synchronized with the input voltage Vin as in the first embodiment, and the amplitude of which is, for example, the input voltage supplied from a commercial power supply or the like. Is set to a value corresponding to the amplitude of the rated voltage of.
  • a difference value between the multiplication result in the calculator 63 and the input current Iin detected in the input current detector 33 is calculated in the calculator 64, and this difference value is set to zero.
  • the current adjustment calculation is performed by the current regulator 65, and the calculation result is input to the calculator 67 via the cutoff switch 66, and this and the reference sine wave signal sin ⁇ t are added.
  • the reference sine wave signal s in cot is a signal whose phase is synchronized with the input voltage Vin as in the first embodiment, and its amplitude is set according to, for example, the rated voltage to the load. .
  • a pulse signal for rectifying the parallel converter 12 is generated in the PWM control unit 68 based on the calculation result in the arithmetic unit 67, and each switching element of the parallel converter 12 is turned on. Controlled. That is, the input current I in Feedback control is performed so that the current value corresponds to the difference value between the flow voltage E dc and the DC voltage command value E dc * and the power factor of the input current I in becomes “1”.
  • the power factor of the input current Im does not necessarily need to be “1”. However, in order to prevent the harmonic component from flowing to the commercial power supply, “1” is used. Is desirable.
  • the cut-off switch 66 is controlled to be in a conductive state when the input voltage is within a preset allowable range in which the input voltage can be considered to be normal, and the input voltage is controlled to fall within the allowable range. When the voltage falls below the lower limit, it is controlled to shut off as an abnormal voltage.
  • the PWM control unit 6 In 8 a pulse signal for operating the parallel converter 12 is operated based on the reference sine wave signal sincot, and each switching element of the parallel converter 12 is controlled based on the pulse signal. . That is, feedforward control is performed based on the reference sine wave signal sinot. Note that, when the parallel converter 12 is operated in an inverting mode when the input voltage drops, the voltage difference between the input voltage and the output voltage of the parallel converter 12 is applied to the input reactor Lin, and flows to the input reactor Lin. Since the current increases with time, the inductance value of the input reactor L in is set so that this reactor current can be kept within the allowable range.
  • the input voltage Vin detected by the input voltage detector 32 falls within a predetermined allowable range. Is determined to be normal, and the relay switch control section 23 controls the relay switch 6 to a conductive state. Therefore, it was supplied from a commercial power source, etc.
  • the power is supplied to the load via the relay switch 6, and the series inverter controller 26 controls the series inverter 18 so that the output voltage Vout to the load becomes the output voltage command value Vout *.
  • the DC power of the battery 14 and the capacitor 16 Since the DC power of the battery 14 and the capacitor 16 is converted to AC power, the DC power of the battery 14 and the capacitor 16 is applied in series to the power supply line LN via the series transformer 19, and the output voltage Vout to the load becomes The output voltage command value will be maintained at V ou ⁇ *.
  • the input reactor L depends on the current value necessary to maintain the voltage across the capacitor 16 at the DC voltage command value E dc *. in, and the input current I in detected by the input current detector 3 3 matches this command value, and furthermore, the input current I in has a power factor of 1. Feedback control of parallel converters 1 and 2.
  • the energy of the battery 14 and the capacitor 16 is supplied to the load as a supply current to the load via the parallel converter 12, and when the DC voltage E dc decreases accordingly, the DC voltage command value E d And an actual DC voltage E dc, a current flows through the input reactor L in .At this time, the input current I in is controlled to have a power factor of 1, so the output current I o ′ If ut includes an ineffective component such as a harmonic component, the ineffective component flows to the parallel converter 12 and is absorbed there. That is, the parallel converter 2 eventually functions as an active filter.
  • the relay switch control section 23 controls the relay switch 6 to the cut-off state on the date when it is detected. .
  • the serial inverter control unit 26 continues to perform the inverter operation to keep the output voltage Vout constant as before, but the parallel converter 12 detects an abnormal input voltage. That Then, the cut-off switch 66 is operated to be in the cut-off state, and based on the reference sine wave signal s incot, the AC power of the specified voltage corresponding to the supply voltage of the commercial power supply 1 from the DC power of the battery 14 and the capacitor 16.
  • the parallel converters 12 are controlled so as to generate. As a result, the DC power of the battery 14 and the capacitor 16 is converted into AC power and supplied to the load via the power supply line LN.
  • the relay switch 6 is controlled to be in the cut-off state, and the parallel converter 1 and 2 operate instantly, but the relay switch 6 actually operates. Since it takes some time to be in the cutoff state, the inverse operation of the parallel converter 12 starts before the relay switch 6 becomes in the cutoff state.
  • the input reactor Lin is inserted between the connection point of the parallel converters 12 and the feed line LN and the relay switch 6, and the input reactor Lin acts as a current limiting reactor. Short-circuit current flowing to the commercial power side from night 12 is suppressed. Therefore, AC power of a predetermined voltage is supplied to the power supply line LN, and the output voltage Vout to the load is corrected by the series inverter 18 so that the output voltage Vout becomes the output voltage command value Vout *. Therefore, even if the operation of the parallel converter 12 is switched to the inverting operation due to a voltage abnormality in the input voltage due to a short circuit or the like, the voltage is continuously supplied to the load. The AC power whose value is the output voltage command value V out * is output.
  • the parallel converters 12 start the impeller operation, a voltage difference occurs between the commercial power supply side of the input reactor L in and the parallel converter side, and this voltage difference is applied to both ends of the input reactor L in.
  • the current flowing through the input reactor Lin increases with time, but there is no problem because the inductance value of the input reactor Lin is set in consideration of the reactor current. Therefore, in this case as well, it is possible to prevent instantaneous blackout as in the first embodiment, and in the second embodiment, the input current Iin is set to a predetermined current value.
  • the control is performed so that the power factor becomes 1, it is possible to prevent the harmonic current from flowing to the commercial power supply.
  • the present invention can be realized without requiring high processing performance.
  • the third embodiment is a combination of the first and second embodiments.
  • the uninterruptible power supply according to the third embodiment differs from the uninterruptible power supply according to the second embodiment shown in FIG.
  • the AC switch 5 according to the first embodiment is interposed, and the AC switch control unit 22 according to the first embodiment is provided instead of the re-switch control unit 23 of the compensation circuit 10.
  • the parallel converter overnight controller 24a controls the parallel converter 12 so that the power factor of the input current Iin becomes "1". In this case, the power factor is always "1". However, as in the first embodiment, the thyristor is automatically activated even though the input voltage has not dropped due to the input power factor not being “1”. It is sufficient that the power factor is such that it can be prevented from being turned off.
  • the thyristors 5a and 5b are turned on alternately according to the polarity of the input voltage Vin.
  • the series inverter 18 performs an inverter operation so that the output voltage Vout to the load becomes the specified voltage, and as a result, the output voltage Vout to the load Is maintained at a specified voltage.
  • the command value of the input current Iin is set according to the difference between the voltage E dc across the capacitor 16 and the DC voltage command value Ed, and the power factor of the current flowing through the reactor L in becomes 1 Then, the command value of the current of the input current Iin is determined, and the parallel converter 12 is controlled so that the command value matches the input current Iin.
  • the current is supplied to the load via the parallel converter 12 and when the DC voltage E dc decreases, the input current I in corresponding to the difference from the DC voltage command value Ed flows through the reactor L in.
  • the input current Iin is controlled so that the power factor becomes 1, so that the harmonic component included in the output current Iout flows through the parallel converter 12 and the harmonic current becomes It does not flow to the power supply.
  • the reactor value of in can be set to a smaller value.
  • the parallel converter 12 and the serial inverter 18 are configured by a full bridge circuit composed of a switching element and a diode connected in antiparallel to the switching element has been described.
  • the present invention can be applied to a half-bridge circuit.
  • the AC switch 5 or the relay switch 6 corresponds to the power supply switch
  • the parallel converter 12 corresponds to the parallel converter
  • the notch 14 and the capacitor 16 correspond to the power storage means.
  • the serial inverter 18 and the serial inverter controller 26 correspond to the serial inverter
  • the input voltage detector 32 corresponds to the voltage abnormality detecting means
  • the AC switch controller 22 or the relay switch corresponds to the AC switch controller 22 or the relay switch.
  • the controller 23 and the parallel converter controller 24 or 24a correspond to the control means.
  • the power supply switch inserted in the power supply line is configured by two thyristors connected in antiparallel, and the power supply line Since the power factor is controlled so that the input power factor of the AC power is 1 by turning on and off alternately according to the polarity of the input voltage to the input terminal of the input terminal, when the input voltage drops due to a power failure, etc.
  • the power supply switch can be automatically turned off when a reverse bias is applied to the thyristor before the parallel converter starts the inverting operation.
  • the series inverter operates using the power storage means as an energy source so that the AC output voltage becomes a command value. Therefore, the voltage value of the AC output can be maintained at the command value, and the output voltage can be prevented from being in a momentary power failure state.
  • the current flowing through the input reactor is controlled by the parallel converter so that the energy of the power storage means becomes a specified value. Since the high-frequency component of the current flows, the high-frequency component can be absorbed by the parallel converter with simple control, and can be realized without requiring a high-performance processing device.
  • the series inverter operates using the power storage means as an energy source so that the AC output voltage becomes the command value, so that the voltage value of the AC output is maintained at the command value.
  • the output voltage can be prevented from being in a momentary power failure state.
  • the power supply switch inserted into the power supply line is constituted by two thyristors connected in anti-parallel, and alternately according to the polarity of the input voltage. Since the power supply is turned on and off and the current flowing through the input reactor is controlled to have a power factor of 1, when the input voltage drops due to a power failure or the like, the thyristor current before the parallel converter starts inverting operation The power supply switch can be automatically turned off when a reverse bias is applied to the power supply. Also, at this time, since the AC output voltage is operated at a predetermined value by using the power storage means as an energy source, the AC output can be maintained at a predetermined voltage value, and the output voltage is temporarily stopped.
  • the state can be avoided.
  • the parallel converter since the parallel converter was operated so that the energy of the power storage means became the specified value and the input power factor of the AC power was 1, the parallel converter was eventually operated.
  • the high frequency component of the output current flows, and the high frequency component can be absorbed by the parallel converter with simple control.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Inverter Devices (AREA)
  • Stand-By Power Supply Arrangements (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

L'invention concerne une alimentation non interruptible destinée à empêcher un arrêt instantané lorsque le fonctionnement est basculé en mode d'inverseur par séparation du côté entrée de tension du système si la tension d'entrée baisse. La tension d'entrée est fournie à la charge via un commutateur CA (5) composé de thyristors connectés en parallèle inverse afin de permettre au thyristor à travers lequel passe un courant de même polarité que celle de la tension d'entrée d'être conducteur. Un convertisseur parallèle (12) connecté à une ligne d'alimentation (LN) peut mener des opérations de redressement afin de charger une batterie (14). Un inverseur série (18) peut réaliser une opération de conversion en utilisant la batterie (14) comme source d'énergie. La sortie de l'inverseur série (18) est fournie en série à la ligne d'alimentation (LN) via un transformateur série (19) afin de corriger la tension de sortie appliquée à la charge. Si la tension d'entrée baisse, le thyristor commandé pour être conducteur est automatiquement coupé lorsqu'une polarisation inverse est appliquée. Lorsque le fonctionnement du convertisseur parallèle (12) est commutée en fonctionnement d'inverseur, le commutateur (5) est dans un état ouvert. On empêche ainsi tout arrêt instantané d'alimentation à la charge provoqué lorsqu'un courant passe à travers le commutateur CA (5) et une partie de court-circuit.
PCT/JP2003/002273 2002-03-06 2003-02-28 Alimentation non interruptible WO2003075430A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003211808A AU2003211808A1 (en) 2002-03-06 2003-02-28 Uninterruptible power supply

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2002060975A JP2003259567A (ja) 2002-03-06 2002-03-06 無停電電源装置
JP2002-60975 2002-03-06

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Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005041384A1 (fr) * 2003-10-27 2005-05-06 Mitsubishi Denki Kabushiki Kaisha Dispositif d'alimentation
JP4893007B2 (ja) * 2006-02-07 2012-03-07 サンケン電気株式会社 交流スイッチ
JP5109574B2 (ja) * 2007-10-19 2012-12-26 富士電機株式会社 無停電電源装置
JP5233450B2 (ja) * 2008-07-02 2013-07-10 株式会社明電舎 瞬低補償装置
JP5428744B2 (ja) * 2009-10-21 2014-02-26 株式会社明電舎 電力変換装置の制御方法
JP5609380B2 (ja) * 2010-07-28 2014-10-22 パナソニック株式会社 ハイブリッド電源装置
JP5609379B2 (ja) * 2010-07-28 2014-10-22 パナソニック株式会社 ハイブリッド電源装置
US8922062B2 (en) * 2011-03-14 2014-12-30 Sunpower Corporation Automatic voltage regulation for photovoltaic systems
US9935630B2 (en) * 2015-09-18 2018-04-03 Monolithic Power Systems, Inc. AC switch circuit and associated control method
ES2829256T3 (es) 2016-02-05 2021-05-31 Guangdong Oppo Mobile Telecommunications Corp Ltd Método de carga y adaptador
EP3291411B1 (fr) * 2016-09-01 2019-05-08 Maschinenfabrik Reinhausen GmbH Procede de commande d'une alimentation electrique secourue et installation pour une alimentation electrique secourue
JP6618210B2 (ja) * 2018-02-05 2019-12-11 ニシム電子工業株式会社 無停電電源装置
JP7129258B2 (ja) * 2018-07-24 2022-09-01 ニシム電子工業株式会社 無停電電源装置
CN109818355B (zh) * 2019-02-15 2020-11-24 董振隆 一种三端口式电网净化器
CN113922672A (zh) * 2020-07-10 2022-01-11 Oppo广东移动通信有限公司 电源适配器

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0583860A (ja) * 1991-09-18 1993-04-02 Toshiba Corp 電力変換装置
JPH05219662A (ja) * 1992-02-03 1993-08-27 Fuji Electric Co Ltd 航空機電源の切替え方法とその切替え装置
JPH11178216A (ja) * 1997-12-11 1999-07-02 Hitachi Ltd 無停電電源装置
JPH11299129A (ja) * 1998-04-17 1999-10-29 Hitachi Ltd 電源並列接続型無停電電源装置
JP2000060026A (ja) * 1998-08-17 2000-02-25 Sanken Electric Co Ltd 無停電電源装置
JP2000278882A (ja) * 1999-03-24 2000-10-06 Sanyo Denki Co Ltd 無停電電源装置
JP2001128390A (ja) * 1999-11-01 2001-05-11 Tokyo Gas Co Ltd 無停電電源システム

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0583860A (ja) * 1991-09-18 1993-04-02 Toshiba Corp 電力変換装置
JPH05219662A (ja) * 1992-02-03 1993-08-27 Fuji Electric Co Ltd 航空機電源の切替え方法とその切替え装置
JPH11178216A (ja) * 1997-12-11 1999-07-02 Hitachi Ltd 無停電電源装置
JPH11299129A (ja) * 1998-04-17 1999-10-29 Hitachi Ltd 電源並列接続型無停電電源装置
JP2000060026A (ja) * 1998-08-17 2000-02-25 Sanken Electric Co Ltd 無停電電源装置
JP2000278882A (ja) * 1999-03-24 2000-10-06 Sanyo Denki Co Ltd 無停電電源装置
JP2001128390A (ja) * 1999-11-01 2001-05-11 Tokyo Gas Co Ltd 無停電電源システム

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