WO2004019466A1 - 電力供給システム - Google Patents
電力供給システム Download PDFInfo
- Publication number
- WO2004019466A1 WO2004019466A1 PCT/JP2003/010564 JP0310564W WO2004019466A1 WO 2004019466 A1 WO2004019466 A1 WO 2004019466A1 JP 0310564 W JP0310564 W JP 0310564W WO 2004019466 A1 WO2004019466 A1 WO 2004019466A1
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- WIPO (PCT)
- Prior art keywords
- power supply
- voltage
- output
- unit
- supply system
- Prior art date
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Classifications
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- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- 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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- 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
Definitions
- the present invention relates to a power supply system, and more particularly, to a system for supplying power to a load by operating a plurality of power supply units each having a small power generator in parallel.
- Conventional technology for supplying power to a load by operating a plurality of power supply units each having a small power generator in parallel.
- Such small power generation facilities are used by small-scale power consumers such as stores. Therefore, it is preferable that the driving operation be automated as much as possible and that stable driving can be performed. Furthermore, it is preferable that the system be connected to a commercial AC power supply system and that it be possible to flexibly cope with load fluctuations.
- the commercial AC power supply can be adjusted simply by matching the frequency, phase, and voltage of a plurality of power supply units that are operated in parallel. Operation can be performed independently of the side. In such a case, it is not preferable from the viewpoint of mechanical efficiency to make a plurality of power supply units connected in parallel to have the same standard and the same characteristics and to distribute the load evenly. This is because it is more efficient to operate the engine of the power supply unit at a certain rating.
- the present invention has been made in view of the above circumstances, and an object thereof is to provide a power supply system including a plurality of power supply units connected in parallel by changing a control method with the same configuration.
- synchronous operation can be performed with high reliability in both the grid-connected operation with the commercial AC power system and the non-linked operation (independent operation).
- Another object of the present invention is to provide a power supply system having a plurality of power supply units connected in parallel, in which at least one power supply unit is automatically operated at a rated output, and the others are used for power adjustment. It is to be able to drive.
- the present invention provides a power supply system including a plurality of power supply units each having an output connected in parallel to a power transfer line to a load, wherein each power supply unit has An inverter device for converting a voltage generated by the power generation device into an AC voltage and outputting the AC voltage;
- An inverter control device for controlling the driver / equalizer device, comprising: a driver / equalizer controller provided with a load sharing adjuster for adjusting supply of load current;
- a connecting device for supplying an AC voltage output from the transmitter to the power transfer line
- a power supply system comprising:
- the inverter device of each power supply unit includes an AC / DC converter that converts a voltage generated by the power generator into a DC voltage. And a DC / AC converter for converting the boosted DC voltage into an AC voltage to be output.
- the load sharing adjustment unit of the inverter control device includes an inverter device. By controlling the step-up unit, the current output from the DC / AC converter is less than the specified In this case, a constant DC voltage is output from the booster, and when the current output from the DC / AC converter is equal to or greater than the predetermined current, the DC voltage that gradually decreases as the current increases is boosted. It is configured to output from the unit. In this case, it is preferable that the load sharing adjustment units of each of the plurality of power supply units perform control so that constant DC voltages output from the respective boosting units are different from each other.
- the inverter device of each power supply unit includes an AC / DC conversion unit that converts a voltage generated by the power generation device into a DC voltage.
- a booster that boosts the DC voltage; and a DC / AC converter that converts the boosted DC voltage to an AC voltage to be output.
- the load sharing adjustment unit of the inverter control device includes a DC / AC converter of the inverter device.
- the AC / DC converter By controlling the AC converter, if the current output from the DC-Z AC converter is equal to or less than a predetermined current that is equal to or less than the rated AC current, a constant AC voltage is output from the DC-Z AC converter, and the DC Z
- the AC / DC converter is configured to output an AC voltage that gradually decreases as the current increases.
- the load sharing adjustment units of each of the plurality of power supply units control such that a constant AC voltage output from each DC / AC conversion unit is different from each other.
- the inverter device of each power supply unit includes an AC / DC converter that converts a voltage generated by the power generator into a DC voltage. And a DC / AC converter for converting the boosted DC voltage into an AC voltage to be output. If the current output from the DC / AC converter is less than or equal to the specified AC current or less by controlling both the DC / AC converter and the DC / AC converter, a constant DC voltage is output from the booster. And a constant AC voltage is output from the DC / AC converter. If the current output from the DC / AC converter is equal to or greater than the predetermined current, the DC voltage gradually decreases as the current increases.
- the causes output from the boosting section is configured to output an AC voltage that decreases gradually from the AC / DC conversion unit.
- the load sharing adjusters of each of the plurality of power supply units output a fixed direct current output from each booster. It is preferable that the control is performed so that the current voltages are different from each other and the constant AC voltages output from the respective DC / AC converters are different from each other.
- the present invention provides a power supply system for supplying power to a load
- a plurality of power supply units each output of which is connected in parallel to a power transfer line to a load, wherein each power supply unit converts a voltage generated by the power generator into an AC voltage and outputs the AC voltage.
- An inverter control device for controlling an inverter device, which detects a voltage of the external AC power supply during a connection operation with an external AC power supply, and changes a phase of an AC voltage output from the inverter device to an external AC power supply.
- An inverter control device including a first synchronization control unit that controls the voltage to be in phase with the voltage of the power supply;
- a connection device that supplies the AC voltage output from the
- a plurality of power supply units consisting of
- a power supply system comprising a unit control device for starting, stopping, and controlling output of each of a plurality of power supply units.
- each power supply unit further includes means for generating an islanding operation detection synchronization signal, and a predetermined period after the islanding operation detection synchronization signal is output.
- An islanding operation detection unit that detects whether or not the islanding operation is disconnected from the external AC power supply, a unit that transmits an islanding operation detection synchronization signal to another power supply unit, and islanding operation detection from another power supply unit.
- At least one power supply unit further includes a means for generating an islanding operation detection synchronization signal, and an islanding operation detection synchronization signal. From the external AC power supply for a predetermined period after An isolated operation detection unit that detects whether or not the isolated operation has been performed, and a unit that transmits an isolated operation detection synchronization signal to another power supply unit, and all the power supply units being driven have the same timing It is configured to be able to detect the islanding operation.
- the isolated operation detection unit of each power supply unit is configured to function as a power failure detection unit for detecting a power failure of the external AC power supply when the power supply unit is connected to the external AC power supply.
- the system further includes a synchronization signal line commonly connected to the plurality of power supply units, and the power supply unit includes
- the overnight control device further includes a second synchronization control unit, and the second synchronization control unit generates a synchronization signal of a first cycle synchronized with an AC voltage output from its own inverter device.
- a synchronization signal generating circuit for generating a synchronization signal of a first cycle starting from the received synchronization signal when receiving the synchronization signal.
- each power supply unit further includes a waveform detection unit that detects an AC voltage waveform at the connection unit, and the individual operation of each power supply unit is performed.
- the detection unit shifts the frequency of the AC voltage output from the associated power supply unit in a positive or negative direction for a predetermined period after the generation of the islanding operation synchronization signal, and then shifts the frequency in the negative or positive direction.
- the waveform detected by the waveform detection unit during the period is a frequency other than the frequency of the external AC power supply, it is configured to determine that the external AC power supply is shut off.
- the invertor control device of each power supply unit further includes its own inverter during self-sustaining operation disconnected from an external AC power supply. Equipped with a synchronization control unit that synchronizes the phase of the AC voltage output from the overnight device with the phase of the AC voltage output from the inverter device of another power supply unit or the phase of the AC voltage of the external AC power supply .
- the power supply system further includes the same power supply system connected in common to multiple power supply units.
- the synchronization control section of each power supply unit generates a synchronization signal of the first cycle synchronized with the AC voltage output from its own inverter and outputs the synchronization signal on the synchronization signal line.
- Each power supply unit further includes a waveform detection unit that detects an AC voltage waveform at the connection unit, and an external power supply cutoff detection unit that detects whether the external AC power supply is cut off.
- the external power cutoff detecting unit periodically shifts the frequency of the AC voltage output from the associated power supply unit in the positive or negative direction, and then shifts the frequency in the negative or positive direction for a predetermined period, and During the period, when the waveform detected by the waveform detection unit has a frequency other than the frequency of the external AC power supply, it is preferable to determine that the external AC power supply has been interrupted.
- the present invention further provides a power supply system for supplying power to a load
- One or more lines, and a power transfer line for supplying power to the load by at least one of an operation connected to an external AC power supply and an independent operation disconnected from the external AC power supply;
- a plurality of power supply units each output of which is connected in parallel to a power transfer line, wherein each power supply unit converts an voltage generated by the power generation device into an AC voltage and outputs the AC voltage;
- An inverter control device for controlling the inverter device, comprising: a synchronization controller for synchronizing a phase of the AC voltage output from the inverter device with a predetermined AC voltage phase.
- a plurality of power supply units comprising a connection device for supplying an AC voltage output from the inverter to the power transfer line;
- a unit controller that controls start / stop and output of each power supply unit
- the predetermined AC voltage is a voltage from one selected from an external AC power supply or another power supply unit.
- the synchronization control unit of the power supply unit monitors the AC voltage on the power transfer line during the self-sustaining operation, and synchronizes the phase of the AC voltage output from the corresponding inverter with the phase of the AC voltage. Have been.
- the number control device controls the operation of a plurality of power supply units on the power carrier line via the power line carrier modem. Is output.
- the system further includes communication lines such as wireless communication, optical communication, and a digital bus.
- the control signal for controlling the operation of the unit is configured to be supplied to a plurality of power supply units via a communication line.
- the number control device may generate a control signal based on control information supplied from an external device via communication means.
- the control signal output from the number control device includes a signal for causing the voltage values of the AC voltages output from the power supply units to be different from each other.
- the inverting device of each power supply unit includes an AC / DC converter that converts a voltage generated by the power generator into a DC voltage.
- the power supply system further includes means for setting the set values of the AC voltage output from each of the plurality of power supply units to be different from each other.
- the control device is configured to: (i) when the AC current or power output from the power supply unit exceeds a set value, fix the control of the DC / AC conversion unit of the related inverter device at that time. (Ii) when the AC current or power output from the power supply unit exceeds a set value, Whether the control of the booster of the related inverter device is configured to be fixed at that time, or (iii) when the AC current or the power output from the power supply unit exceeds the set value, the related member is not controlled. It is preferable that the control of the DC / AC converter of the evening device is fixed at that time.
- means for outputting a control signal representing a set voltage value may be provided in the number control device so that the voltage values of the AC voltages output from the plurality of power supply units are different from each other.
- the inverter control device of each power supply unit further includes a load sharing adjustment unit that adjusts the sharing of load current.
- the impeller unit of each power supply unit includes an AC / DC converter for converting the voltage generated by the power generator into a DC voltage, a booster for boosting the converted DC voltage, and a boosted DC.
- the load sharing adjustment unit controls the DC / AC conversion unit by controlling both the boosting unit and the DC / AC conversion unit of the inverter.
- the inverter device of each power supply unit has an AC-Z DC converter for converting the voltage generated by the power generator into a DC voltage, a booster for boosting the converted DC voltage, and a booster for boosting the converted DC voltage.
- the inverter device of each power supply unit further includes a DC voltage from the boosting unit of each power supply unit. It is preferable to provide a means for setting the lower limit of the AC voltage output from the power supply unit by controlling the power supply unit so as not to fall below a predetermined value.
- the power generator of each power supply unit is a generator directly connected to the gas turbine engine.
- FIG. 1 is a diagram showing a configuration of an embodiment of a gas turbine power supply unit that can be adopted as a power supply unit provided in the power supply system of the present invention.
- FIG. 2 is a diagram showing a configuration of a power supply system according to an embodiment of the present invention, in which a plurality of the gas power supply units shown in FIG. 1 are connected in parallel.
- FIG. 3 shows the power supply system shown in Fig. 2, which is generated from the inverter output voltage and the interconnection control unit of the control unit during parallel connection of independent operation disconnected from an external AC power supply such as a commercial AC power supply.
- FIG. 7 is a waveform diagram showing a relationship with a synchronization pulse.
- FIG. 4 shows that in the power supply system shown in FIG. 2, the external AC power supply was interrupted (for example, a power failure) during the interconnection operation with an external AC power supply such as a commercial AC power supply, that is, a single operation.
- FIG. 7 is a waveform diagram for explaining the principle for detecting the fact.
- FIG. 5 is a diagram showing a configuration of another embodiment of a gas turbine power supply unit that can be adopted as a power supply unit provided in the power supply system of the present invention.
- FIG. 6 is a diagram showing a configuration of a power supply system according to another embodiment of the present invention, in which a plurality of the gas turbine power supply units shown in FIG. 5 are connected in parallel.
- FIG. 7 is a graph showing current / voltage output characteristics of three gas turbine power supply units, which are set in the method for controlling the rated operation of at least one gas turbine power supply unit in the power supply system according to the present invention. is there.
- a power supply unit 50 including a gas turbine generator and a power converter, which can be applied as a power supply unit to the power supply system of the present invention, will be described.
- gas turbine generators have the characteristic that large power output can be obtained despite their small size due to the ultra-high-speed rotation of the gas turbine engine and the generator connected directly to it. More specifically, in the gas turbine power generation device, as shown in FIG. 1, a rotary shaft 1 is connected to a gas turbine bin 2, a compressor blade 3, and a rotor of a generator 4. In other words, by mixing and burning air and fuel, ultra-high speed A rotating gas turbine engine, a compressor for compressing air supplied to the gas turbine, and a DC brushless generator 4 having a stay around a rotor are integrally formed.
- a liquid or gas fuel is supplied to a combustor of a gas turbine engine via a fuel control valve 12 by a fuel supply device (not shown), and the fuel is mixed with compressed air and burned.
- the gas turbine blade 2 is rotationally driven.
- the combustion gas that has passed through the gas bins 2 exchanges heat with the air compressed by the compressor blades 3 in the regenerator and is discharged to the outside.
- the compressed air preheated by the regenerator is supplied to the combustor and mixed with fuel to rotate the gas turbine blade 2 at high speed as described above. As a result, a large power generation output can be obtained while being small.
- the generator 4 is a permanent magnet type generator in which a permanent magnet is provided around a rotor. A stay is arranged outside the rotor, and the induced voltage generated as the rotor rotates is output from the stay winding.
- a permanent magnet type generator By using a permanent magnet type generator, current loss does not occur on the rotor side, so that high-speed operation and good power generation efficiency can be obtained.
- the electric power generated by the generator 4 directly connected to the rotating shaft 1 of the high-speed rotating gas bin bin 2 is supplied to the AC / DC converter circuit (full-wave rectifier) by the inverter unit 5 constituting the power converter.
- the DC that is rectified by 6 and obtained is boosted by a booster circuit (DC / DC converter) 7, and the boosted DC is supplied to an external AC power supply such as a commercial AC power supply by a DC / AC inverter circuit 8 Is converted to AC power having the same frequency, voltage, and phase as The output of the invar overnight device 5 is sent to the load side via the connection 9.
- a booster circuit DC / DC converter
- DC / AC inverter circuit 8 Is converted to AC power having the same frequency, voltage, and phase as
- the output of the invar overnight device 5 is sent to the load side via the connection 9.
- the engine control unit 11 controls the opening of the fuel control valve 12 and the like during startup and steady operation.
- the boost controller 16 controls the boost of the DC output voltage of the booster circuit 7 of the impeller device 5.
- the pump 14 and the pump control unit 13 are for lubricating and cooling the generator 4 with oil.
- the control of the booster circuit 7 and the inverter circuit 8 of the inverter unit 5 is performed by an inverter control unit 18 mainly composed of a microprocessor.
- the inverter control section 18 includes a DC output of the booster circuit 7, that is, an inverter circuit.
- a PID control unit 22 and a PWM control unit 23 for performing pulse width modulation control of the inverter circuit 8 are provided. Under the control of the PWM control section 23, an AC output of an arbitrary voltage, frequency and phase is formed.
- the inverter control unit 18 includes a switch control unit 24 that controls opening and closing of various switches, a start control unit 25 that performs start control of a power supply unit, and the like, and an external AC
- the interconnection control unit 26 for performing synchronous operation with other power supply units via the synchronous input circuit 28 and the synchronous output circuit 29, and an external AC
- An external AC cutoff detection unit 27 is provided for detecting cutoff of the power supply, that is, detecting whether or not it is in an isolated operation (for example, a power failure or the like) disconnected from the AC power supply.
- the operation control unit 30 supplies a start / stop signal to the engine control unit 11 and the inverter control unit 18 to control the start / stop of the power supply unit 50 and to control the start / stop of the power supply unit 50. It is used to control the AC power (voltage and current) to be output from 0 and its frequency.
- FIG. 2 shows an embodiment of a power supply system according to the present invention in which a plurality of power supply units are connected in parallel.
- each of 51 to 53 is a power supply unit having the same configuration as the power supply unit 50 using the gas turbine power generator shown in FIG.
- the power output terminals of the power supply units 51 to 53 are connected to the load, that is, the bus 100 of the external AC power supply system.
- the inverter device 5 (FIG. 1) of each of the power supply units 51 to 53 controls the output of the generator 4 under the control of the inverter control unit 18. It is rectified and smoothed by a comparator 6, boosted by a booster circuit 7, converted to an AC voltage by an inverter circuit 8, and output.
- the number control device 110 controls the start and stop of the power supply units 51 to 53 via the operation control unit 30 and responds to fluctuations in the load L for efficient operation. Then, the number of gas turbine power supply units to be operated is controlled.
- control signals for setting the AC power and frequency to be output from the power supply units 51 to 53 are generated in the unit control device 110, and the respective operation control units are generated. It may have a function of supplying 30. Such a control signal may be supplied to the operation control unit 30 from another device or from another device via the number control device 110 instead of the number control device 110. . Further, in the system of FIG. 2, the control signal from the number control device 110 is configured to be supplied in series to each of the power supply units 51 to 53. The control signals from the power supply units 51 to 53 may be supplied in parallel to the respective power supply units 51 to 53.
- Synchronous operation control of these power supply units 51 to 53 is performed by the interconnection control unit 26 of each of the power supply units 51 to 53 via a synchronous input circuit 28 and a synchronous output circuit 29. This is done by sending and receiving.
- the interconnection control unit 26 of each power supply unit has an evening function.
- the interconnection control unit 26 of the unit 51 is operated as shown in FIG.
- the generated synchronization pulse S1 is returned to the interconnection control unit 26 via the synchronization output circuit 29 and the synchronization input circuit 28, whereby the timer is reset and the time of the period T1 is measured. It is started again.
- the interconnection control unit 26 outputs a synchronization pulse train with a period T1.
- This synchronization pulse train is supplied to the PWM control unit 23 via the PID control unit 22, whereby the inverter unit 5 of the power supply unit 51 receives the cycle T synchronized with the synchronization pulse S ′ 1.
- An AC voltage having 1 can be output.
- the synchronization pulse S1 generated by the interconnection control unit 26 of the power supply unit 51 during operation is also transmitted to the synchronization input of the other power supply units 52, 53 via the synchronization signal line 112. Circuit 28 is also provided.
- the synchronization pulse S1 from the power supply unit 51 is transmitted to the synchronization input circuit of the power supply unit 52.
- the timer of the interconnection control unit 26 is reset. Then, similarly to the power supply unit 51, the interconnection control unit 26 of the power supply unit 52 outputs a synchronization pulse every period T1 from the time when the synchronization pulse S1 is received.
- the interconnection control unit 26 of the power supply unit 52 can also output a synchronization pulse train at a timing synchronized with the power supply unit 51, so that the power supply unit 52 has a power supply unit. 51 AC voltage synchronized with the output of 1 can be output.
- all the power supply units 51 to 53 can output the same phase waveform during operation. Further, even if one power supply unit stops operating due to a failure or the like, the other plurality of power supply units in operation can be operated synchronously.
- each power supply unit When the power supply system shown in Fig. 2 performs grid-connected operation with an external AC power supply, each power supply unit generates an output voltage synchronized with the external AC power supply voltage as follows. For example, when an operation command is supplied to the power supply unit 51 from the number control device 110 and lined up, the voltage / current detection unit 21 of the inverter control unit 18 of the power supply unit 51 outputs an external AC signal. The zero crossing point of the power supply voltage is detected and supplied to the interconnection control unit 26. This allows the interconnection control unit 26 to detect the cycle of the external AC power supply voltage, so that the power supply unit 51 can supply an AC voltage synchronized with the external AC power supply. Then, when an operation command is supplied to the other power supply units 52 and 53, each unit similarly detects the zero-crossing point of the external AC power supply voltage and outputs an AC voltage synchronized with the external AC power supply. be able to.
- FIG. 4 shows the voltage waveform V ac ′ of the external AC power supply and the voltage waveform V ac output from each power supply unit of the power supply system according to the present invention in a superimposed manner.
- 3 shows a shutoff detection synchronization signal S2 for detecting the shutoff of the external AC power supply.
- the shutoff detection synchronization signal S2 is generated in the interconnection control unit 26 of the power supply unit, and is for shifting the frequency F of the output voltage from the power supply unit over a predetermined cycle.
- the period in which the frequency F is shifted in the positive direction and in the positive direction is schematically shown for each period.
- each period (frequency shift period) may include a plurality of periods. Needless to say Absent.
- the output voltage of the power supply unit and the voltage of the external AC power supply are synchronized. As shown, these voltage waveforms are identical. Therefore, even if a power failure occurs in the external AC power supply, the power failure cannot be detected because the output voltage of the power supply unit is the same as the output frequency of the external AC power supply. Therefore, a predetermined period from the first zero-crossing point t2 to the zero-crossing point t3 after the time when the disconnection detection synchronization signal S2 is generated from the interconnection control unit 26 (in FIG. 4, the rear end of the signal S).
- the period of the output voltage V ac from the power supply unit shifts in the positive (or negative) direction and then in the negative (or positive) direction.
- the frequency shift amount is preferably, for example, about 2% with respect to the detected external AC power supply frequency.
- the shutoff detection synchronization signal S 2 generated in the interconnection control unit 26 is returned to the interconnection control unit 26 via the synchronization output circuit 29 and the synchronization input circuit 28, and the period T 3 Is reset, and the clocking of cycle T3 is started again.
- the shutoff detection synchronization signal S2 is supplied to the PWM control signal 23 via the PID control unit 22. Thereby, the power supply unit 51 of the interrupter device 5 outputs the shutdown detection synchronization signal S2. At the synchronized timing, the output frequency can be shifted during the period T2.
- the external AC cutoff detection unit 27 determines whether or not the AC voltage detected by the voltage / current detection unit 21 is a frequency-shifted voltage during the frequency shift period T2. If it is determined that the frequency is shifted, it is determined that a power failure has occurred in the external AC power supply.
- the interruption detection synchronization signal S 2 generated by the interconnection control unit 26 of the power supply unit 51 in operation is also transmitted to the other power supply units 5 2 via the synchronization output circuit 29 and the synchronization signal 1 12. , 53 are also supplied to the synchronous input circuit 28.
- the shutoff detection synchronization signal S2 from the power supply unit 51 is transmitted to the power supply unit 52.
- the interconnection controller 26 receives the signal via the synchronization input circuit 28, the timer for measuring the period T3 is reset.
- the interconnection control unit 26 of the power supply unit 52 is It outputs a shutoff detection synchronization signal every cycle T3 from the time when the shutdown detection synchronization signal S2 is received.
- the interconnection control unit 26 of the power supply unit 52 can also output the shutoff detection synchronization signal at a timing synchronized with the power supply unit 51, and thus, can be connected to the external AC power supply at the same timing. It can detect whether a power outage has occurred.
- the device 110 may generate and output a shutdown detection synchronization signal.
- FIG. 5 shows a power supply unit 50 ′ applicable to the power supply system of the second embodiment
- FIG. 6 shows power supply units 51, to 53 ′ composed of the power supply unit. This figure shows a state in which the external AC power supply is connected in parallel to the transfer line, that is, the bus 100.
- the power supply unit 50 ′ shown in FIG. 5 is the same as the power supply unit 50 shown in FIG. 1 except that a power line carrier modem 40 is used instead of the synchronous input circuit 28 and the synchronous output circuit 29.
- the other configuration is the same as that of the power supply unit 50.
- the power supply system of the second embodiment also includes a power line carrier modem 120 between the unit control device 110 and the bus 100.
- the power line carrier modem 40 included in each power supply unit transmits the synchronization pulse S1 and the cutoff detection synchronization signal S2 output from the interconnection control unit 26 via the connection unit 9 and the bus 100 to the other.
- the control signals transmitted from the unit control device 110 via the power line carrier modem 120 and the bus 100 are a command signal for starting and stopping and a power supply unit 5 1 ′ to 5 3 ′, respectively. Are set values of power and frequency to be output.
- the power supply units 51 1 to 53 transmit such control signals to the operation controller 30 and the member controller 18 via the connection unit 9 and the power line carrier modem 40.
- System controller 26 When the control signal is received, the control based on the control signal is performed.
- control signal from the number control device 110 is transferred via the power transfer line, that is, the bus 100, has been described, but instead of the wired communication means using the bus 100,
- the control signal may be communicated using appropriate communication means such as wireless communication, optical communication, and digital bus.
- the number control device 110 receives various control signals for controlling the power supply system from an external device via an arbitrary communication line, and controls each power supply unit based on the control signals. May be generated and supplied to each unit via the power line carrier modem 120 and the bus 100 (or appropriate communication means).
- the number control device 110 determines the number of operating power supply units based on the power to be supplied to the load, and determines the number of operating power supply units. An operation command is supplied, and the operation of each power supply unit is started / stopped based on the command. In the following, even when the unit controller 110 supplies operation commands to all power supply units during self-sustaining operation, one or more power supply units are automatically set according to the load current.
- the gas turbine power supply units 51 to 53 are set so as to have a difference in the current-voltage characteristics of each output.
- Such current-voltage characteristics can be set by an operator or the like on an operation control panel (not shown), for example.
- the set characteristics are determined by controlling the booster circuit 7 by the booster controller 16 or by controlling the inverter circuit 8 by the PWM controller 23 or by performing both of these controls. Obtainable.
- the set current-voltage characteristics may be supplied from the number controller 110 as a control signal to the power supply units 51 to 53. As shown in FIG.
- the maximum value of the output voltages set in the power supply units 51 to 53 that is, the rated voltages V 1 to V 3 (V 1> V 2> V 3 in this example) is
- the load current to be output is a predetermined value I 1 which is approximately the rated current value.
- the output voltage is set to gradually decrease from the rated voltage V1 to V3 when the output voltage exceeds I3.
- the rated voltages of the power supply units 51 to 53 are set to V1> V2> V3, the output voltage of the inverter 8 of the power supply unit 51 becomes the highest. For this reason, the load current I flowing through the bus 100 is first supplied (when the load current is small) from the power supply unit 51, and the other power supply units 52 and 53 almost supply the load current. Do not supply.
- the second power supply unit 52 can supply the load current.
- the first power supply unit 51 supplies an approximately rated current, and the second power supply unit 52 supplies the excess current.
- the current-voltage characteristics shown in FIG. 7 may be obtained by always controlling one of the booster circuit 7 and the inverter circuit 8 and controlling only the other.
- the set values for obtaining the timing for decreasing the voltage are set to the current values I1 to I3. It may be a set value. In this case, it is preferable to set the characteristics such that the power of each power supply unit becomes the power set value at “20” in the slope portion of the characteristics in FIG. It is preferable that such a power set value is set to the same value for all power supply units.
- one power supply unit When a load current exceeding the rated current of one unit is supplied by adopting such a parallel operation method, one power supply unit must be operated at approximately the rated value.
- the two power supply units When supplying a load current exceeding the rated current of two units, the two power supply units can be operated at approximately the rated value. Therefore, efficient operation during parallel operation is possible. Moreover, since the number of power supply units required to supply the load current are automatically operated according to the load current, it is necessary for the number control device 110 to control the number of operating units according to the load current. Absent. By configuring the current and voltage characteristics shown in Fig. 7 so that the operator can arbitrarily set them on the operation control panel of the system, the gas turbine power supply unit with the highest operation rate can be connected. As a result, the operation rate can be flattened.
- the power supply unit 51 when the output of each of the gas bins 51 to 53 has a difference in current-voltage characteristics as shown in FIG. 7, for example, the power supply unit 51 is lower than the other units.
- a voltage When a voltage is output, power from another unit having a high output voltage is charged to the power supply unit 51, and the input DC voltage of the inverter circuit 8 may rise to a predetermined value or more.
- the DC voltage is detected by the inverter input DC voltage detector 20 and at least one of the booster circuit 7 and the inverter circuit 8 is controlled so as not to rise above a predetermined voltage value. Can be prevented from rising.
- gas turbine power supply units in the power supply systems of the first to third embodiments described above, an example was described in which three power supply units using gas turbine generators were connected in parallel to supply load current. It is clear that the number of gas turbine power supply units to be used is not limited to three, but may be any number. However, when the number of parallel operation units increases, the difference in input voltage to the inverter circuit 8 which is a DCZAC converter increases, so that a maximum of about 5 units is desirable.
- power supply units other than the gas supply bin can be used.For example, a power supply unit composed of a combination of a power generation device such as a solar cell or a fuel cell and an inverting device can also be used. It is.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/525,219 US7514813B2 (en) | 2002-08-21 | 2003-08-21 | Electric power supply system |
JP2004530592A JP4256845B2 (ja) | 2002-08-21 | 2003-08-21 | 電力供給システム |
AU2003257641A AU2003257641A1 (en) | 2002-08-21 | 2003-08-21 | Power supply system |
EP03792766A EP1542331A4 (en) | 2002-08-21 | 2003-08-21 | POWER SYSTEM |
Applications Claiming Priority (4)
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JP2002241243 | 2002-08-21 | ||
JP2002-241240 | 2002-08-21 | ||
JP2002-241243 | 2002-08-21 | ||
JP2002241240 | 2002-08-21 |
Publications (1)
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WO2004019466A1 true WO2004019466A1 (ja) | 2004-03-04 |
Family
ID=31949556
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP2003/010564 WO2004019466A1 (ja) | 2002-08-21 | 2003-08-21 | 電力供給システム |
Country Status (5)
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---|---|
US (1) | US7514813B2 (ja) |
EP (1) | EP1542331A4 (ja) |
JP (1) | JP4256845B2 (ja) |
AU (1) | AU2003257641A1 (ja) |
WO (1) | WO2004019466A1 (ja) |
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- 2003-08-21 US US10/525,219 patent/US7514813B2/en not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
EP1542331A4 (en) | 2010-01-20 |
EP1542331A1 (en) | 2005-06-15 |
AU2003257641A1 (en) | 2004-03-11 |
AU2003257641A8 (en) | 2004-03-11 |
JP4256845B2 (ja) | 2009-04-22 |
US7514813B2 (en) | 2009-04-07 |
JPWO2004019466A1 (ja) | 2005-12-15 |
US20060108988A1 (en) | 2006-05-25 |
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