WO2015151205A1 - 高調波電流補償装置及び空気調和システム - Google Patents
高調波電流補償装置及び空気調和システム Download PDFInfo
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- WO2015151205A1 WO2015151205A1 PCT/JP2014/059573 JP2014059573W WO2015151205A1 WO 2015151205 A1 WO2015151205 A1 WO 2015151205A1 JP 2014059573 W JP2014059573 W JP 2014059573W WO 2015151205 A1 WO2015151205 A1 WO 2015151205A1
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- current
- harmonic
- compensation
- load
- compensation current
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/025—Motor control arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/15—Hunting, i.e. oscillation of controlled refrigeration variables reaching undesirable values
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/27—Problems to be solved characterised by the stop of the refrigeration cycle
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- 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
- Y02E40/40—Arrangements for reducing harmonics
Definitions
- the present invention relates to a harmonic current compensator and an air conditioning system.
- the conventional harmonic current compensator is connected in parallel with the harmonic generation load connected to the system power supply.
- a conventional harmonic current compensator detects a load current input to a harmonic generation load and extracts a harmonic component contained in the detected load current.
- the conventional harmonic current compensator generates a compensation current that cancels out the extracted harmonic components by controlling the ON state and the OFF state of the switching element.
- the conventional harmonic current compensator has a function of determining that the current is excessively large (hereinafter referred to as overcurrent) when the instantaneous value of the compensation current is equal to or greater than a predetermined value, and is in a stop state. is doing.
- the conventional harmonic current compensator may stop the operation of the air conditioner by causing the compensation current to instantaneously reach the overcurrent level.
- the conventional harmonic current compensator stops the operation of the air conditioner by causing the compensation current to instantaneously reach the overcurrent level, the frequency of the air conditioner start / stop increases as a result. . Therefore, in this case, since the air conditioner repeatedly starts and stops air conditioning operations such as cooling or heating, there is a possibility that the air conditioner may fall in capacity as a whole.
- the conventional harmonic current compensator operates the air conditioner in order to instantaneously reach the overcurrent level when the change in the instantaneous value of the load current increases due to the influence of the system power supply. There was a problem of stopping.
- the present invention has been made to solve the above problems, and even if the change in the instantaneous value of the load current increases due to the influence of the system power supply, the compensation current instantaneously reaches the overcurrent level. It is an object of the present invention to provide a harmonic current compensator and an air conditioning system that can continue the operation of the air conditioning apparatus without causing the air conditioning apparatus to operate.
- a harmonic current compensator is connected in parallel to a load connected to a system power supply, and supplies a compensation current so that a harmonic component contained in a load current input from the system power supply to the load.
- a harmonic current compensator for suppressing load current detecting means for detecting the load current, compensation current detecting means for detecting the supplied compensation current, and the load detected by the load current detecting means
- Control amount calculation means for calculating a control amount of the compensation current based on the harmonic component included in the current and the compensation current detected by the compensation current detection means, and suppressing the upper limit of the compensation current And a limiter.
- the present invention suppresses the upper limit of the compensation current, so that even if the change in the instantaneous value of the load current increases due to the influence of the system power supply, the compensation current does not instantaneously reach the overcurrent level, and the air conditioning The operation of the device can be continued. Therefore, this invention has the effect that the capability of an air conditioning apparatus can be maintained.
- step of describing the program for performing the operation of the embodiment of the present invention is a process performed in time series in the order described, but it is not always necessary to process in time series.
- the processing executed may be included.
- each block diagram described in this embodiment may be considered as a hardware block diagram or a software functional block diagram.
- each block diagram may be realized by hardware such as a circuit device, or may be realized by software executed on an arithmetic device such as a processor (not shown).
- each block in the block diagram described in the present embodiment is only required to perform its function, and may be composed of a superset, a subset, or a subset of each block.
- items not particularly described are the same as those in the first embodiment, and the same functions and configurations are described using the same reference numerals.
- items that are not particularly described are the same as those in the first and second embodiments, and the same functions and configurations are described using the same reference numerals.
- items that are not particularly described are the same as those in the first to third embodiments, and the same functions and configurations are described using the same reference numerals.
- Embodiments 1 to 4 may be implemented independently or in combination. In either case, the advantageous effects described later can be obtained. Further, various specific setting examples described in the first to fourth embodiments are merely examples, and are not particularly limited thereto.
- the system represents the entire apparatus composed of a plurality of apparatuses.
- the network refers to a mechanism in which at least two devices are connected and information can be transmitted from one device to another.
- Devices that communicate via a network may be independent devices, or may be internal blocks that constitute one device.
- the communication may be communication in which wireless communication and wired communication are mixed as well as wireless communication and wired communication. For example, wireless communication may be performed in a certain section, and wired communication may be performed in another space. Further, communication from one device to another device may be performed by wired communication, and communication from another device to one device may be performed by wireless communication.
- FIG. 1 is a diagram showing a schematic configuration of an air-conditioning system 1 including a harmonic current compensator 15 according to Embodiment 1 of the present invention.
- the harmonic current compensator 15 compensates the load current IL with the harmonic current compensator 15 by suppressing the harmonic component of the current flowing from the system power supply 11 such as an AC power supply.
- the air conditioning system 1 includes a system power supply 11, a harmonic generation load 13, a harmonic current compensator 15, a refrigerant circuit 17, and the like.
- the system power supply 11 is, for example, a three-phase AC power supply and supplies power.
- the harmonic generation load 13 is connected to the system power supply 11. Therefore, the system power supply 11 supplies a current to the harmonic generation load 13.
- the harmonic generation load 13 is, for example, a power converter, and includes a rectifier, a DC reactor, a smoothing capacitor, etc. (all not shown), converts alternating current into direct current, and converts the converted direct current with a PWM signal.
- the power conversion device Into the refrigerant circuit 17.
- the power conversion device generates harmonics when converting alternating current into direct current.
- the refrigerant circuit 17 is configured, for example, by connecting a compressor, a heat source side heat exchanger, an expansion device, a four-way valve, a load side heat exchanger, and the like (all not shown) via a refrigerant pipe. Compresses and discharges the refrigerant, whereby the refrigerant circulates in the refrigerant pipe and a refrigeration cycle is formed.
- the harmonic current compensator 15 is connected in parallel to the harmonic generation load 13 between the system power supply 11 and the harmonic generation load 13.
- the harmonic current compensator 15 suppresses harmonics generated from the harmonic generation load 13.
- the harmonic current compensator 15 detects the load current IL input to the harmonic generation load 13 with the load current detector 31 provided between the system power supply 11 and the harmonic generation load 13. Based on the detected load current IL, the compensation current Ia is supplied to the power receiving point 21 provided between the system power supply 11 and the harmonic generation load 13, and the load current IL is compensated.
- the load current detector 31 may be configured by a current sensor such as a CT (Current Transformer), but is not particularly limited thereto.
- the load current detector 31 may be configured with a shunt resistor.
- the generation factor of the harmonic is not limited to the harmonic generation load 13.
- a harmonic component of the lightning surge is superimposed on the load current IL.
- the harmonic current compensator 15 compensates the load current IL by the operation described below even when a lightning surge or the like enters the system power supply 11 or the like.
- FIG. 2 is a diagram showing an example of operation waveforms for explaining harmonic compensation control in the first embodiment of the present invention.
- the phase shift of the current waveform is an example, and ideally there is no shift.
- the harmonic current compensator 15 includes, for example, a compensation current detector 33, a phase detection unit 41, a compensation output command calculation unit 43, an error amount calculation unit 45, a control amount calculation unit 47, a limiter 49, Control signal generating means 51, main circuit 53, and the like are provided.
- the compensation current detector 33 is provided on the output side of the main circuit 53, detects the compensation current Ia that is the compensation output output from the main circuit 53, and supplies the detection result to the error amount calculation means 45.
- the compensation current detector 33 may be configured with a current sensor such as a CT (Current Transformer), but is not particularly limited thereto.
- CT Current Transformer
- illustration is abbreviate
- the compensation current detector 33 may be configured with a shunt resistor.
- the phase detector 41 detects the phase of the power supply voltage of the system power supply 11.
- the phase detection means 41 includes, for example, a zero cross detection circuit, which detects the zero point of the power supply voltage of the system power supply 11 and calculates the phase ⁇ of the power supply voltage from the zero point of the power supply voltage of the system power supply 11. Ask. For example, as shown in FIG. 2, one of the phases corresponding to the zero point of the power supply voltage is assumed to be ⁇ 0, and thereafter, ⁇ 1 , ⁇ 2 ,..., ⁇ N ⁇ 1 is assumed for each control cycle. Then, N control points are provided within one power supply cycle.
- the phase detection means 41 obtains each value of the phases ⁇ 0 to ⁇ N ⁇ 1 for each control period, thereby obtaining the phase ⁇ corresponding to the control point, and the obtained phase ⁇ is the compensation output command computation means 43.
- the control period is assumed to be the same as the carrier period, but may be a period different from the carrier period.
- the carrier period is assumed to be a period for controlling the ON state and the OFF state of the switching element provided in the main circuit 53.
- the carrier here is a carrier signal, which is a reference carrier used when generating a PWM signal.
- the carrier signal is composed of, for example, a triangular wave, but is not particularly limited thereto, and may be a sawtooth wave having a positive or negative slope.
- the compensation output command calculation means 43 obtains, for example, a harmonic component included in the load current IL supplied from the load current detector 31 for each control period, and uses a signal corresponding to the obtained harmonic component as a compensation output command.
- the error amount calculation means 45 is supplied.
- the compensation output command calculation means 43 is composed of, for example, a bandpass filter and extracts a harmonic component in a preset frequency range, but is not particularly limited thereto.
- the compensation output command calculation means 43 may be composed of a high-pass filter, and may extract harmonic components having a frequency higher than a preset frequency. Further, for example, the compensation output command calculation means 43 performs a Fourier transform on the load current IL supplied from the load current detector 31, extracts a preset frequency component, and performs an inverse Fourier transform on the signal including the extracted frequency component. May be.
- the compensation output command calculation means 43 removes the fundamental wave component from the load current IL supplied from the load current detector 31 and extracts the harmonic component contained in the load current IL supplied from the load current detector 31.
- the mounting form is not particularly limited.
- the error amount calculation means 45 is based on the compensation output command supplied from the compensation output command calculation means 43 and the compensation current Ia supplied from the compensation current detector 33, and the error between the compensation output command and the compensation current Ia. The amount is obtained, and the obtained error amount is supplied to the control amount calculation means 47.
- the control amount calculation unit 47 calculates a control amount based on the error amount supplied from the error amount calculation unit 45 and supplies the calculated control amount to the limiter 49.
- the limiter 49 suppresses the control amount supplied from the control amount calculation unit 47 and supplies the suppression result to the control signal generation unit 51.
- the limiter 49 suppresses the control amount so that the compensation current Ia does not exceed the overcurrent level of the compensation current Ia.
- the overcurrent level is, for example, an upper limit and a lower limit of the compensation current Ia as shown in FIG. That is, the upper limit of the absolute value of the amplitude of the compensation current Ia is set as the overcurrent level. If the compensation current Ia exceeds the overcurrent level, the harmonic generation load 13 stops operation in order to avoid damage to the electric circuit such as dielectric breakdown. Since the compensation current Ia is an alternating current, the limiter 49 suppresses both the positive and negative sides of the compensation current Ia.
- the limiter 49 applies suppression only to the positive side when the compensation current Ia, which is the detection result of the compensation current detector 33, is positive.
- the limiter 49 applies suppression only to the negative side when the compensation current Ia, which is the detection result of the compensation current detector 33, is negative.
- the compensation current Ia is larger than the compensation output command.
- the control itself for suppressing the compensation current Ia is not suppressed. Therefore, a situation in which the compensation current Ia cannot be suppressed and an overcurrent is avoided is avoided.
- the limiter 49 performs the operation as described above, and sets the control amount so that the compensation current Ia does not exceed the overcurrent level of the compensation current Ia. This is supplied to the control signal generating means 51.
- the control signal generator 51 generates a control signal based on the control amount supplied from the limiter 49. Note that the control amount output from the control amount calculation unit 47 is supplied to the control signal generation unit 51 via the limiter 49. As a result, the period corresponding to the ON state of the switching element can be changed short. Thus, an operation of changing the period corresponding to the OFF state of the switching element for a long time is performed.
- the limiter 49 suppresses the control amount to a preset setting value, for example, the limit value described above.
- the preset value is a current value at which the compensation current Ia does not reach the overcurrent level even when the interphase voltage becomes unbalanced or voltage distortion occurs under overload operation conditions. It may be a value determined experimentally so that The preset set value does not affect the ability to suppress the harmonic component of the load current IL even if the phase-phase voltage unbalanced state or the voltage distortion is within the assumed assumption.
- the current value of the compensation current Ia is determined.
- the control amount of the compensation current Ia is equal to or less than a preset value, the compensation current Ia generated based on the control amount of the compensation current Ia is not more than the overcurrent level, but the load current IL The amplitude value that suppresses the harmonic component is satisfied.
- control signal generation unit 51 generates a control signal based on the control amount supplied from the limiter 49 and the carrier cycle, and supplies the generated control signal to the main circuit 53.
- the control signal generation unit 51 calculates a duty ratio based on the control amount supplied from the limiter 49, and generates a control signal, for example, a PWM signal, based on the calculated duty ratio and the carrier period.
- the main circuit 53 has a general circuit configuration.
- the main circuit 53 includes a gate drive circuit, a bridge circuit including six arms including a switching element and a commutation diode, and six arms of the bridge circuit.
- a gate drive circuit for example, the main circuit 53 includes a gate drive circuit, a bridge circuit including six arms including a switching element and a commutation diode, and six arms of the bridge circuit.
- three reactors connected to the midpoints between the three upper arms and the three lower arms, respectively, and an energy storage capacitor provided in the DC section of the bridge circuit (any (Not shown).
- the main circuit 53 generates the compensation current Ia based on the control signal supplied from the control signal generation means 51 and supplies the generated compensation current Ia to the power receiving point 21.
- the compensated system current at this time has a current waveform as shown in FIG. 2, for example. That is, by supplying the compensation current Ia that does not exceed the overcurrent level as shown in FIG. 2 to the power receiving point 21, the distortion component due to the harmonic component contained in the load current IL is suppressed, and as a result The system current in which the distortion component is suppressed is supplied to the harmonic generation load 13.
- the harmonic current compensator 15 suppresses the control amount of the next compensation current Ia by comparing the control amount of the compensation current Ia supplied last time with the preset set value, so that the past compensation
- This is an operation configuration for controlling the future compensation current Ia based on the current Ia. That is, the harmonic current compensator 15 delays the compensation operation of the load current IL by one control period, but sets the carrier frequency to a high value and uses the high-speed switching element to quickly switch the switching element. If the ON state and the OFF state are controlled, the harmonic component of the load current IL can be suppressed to the extent that there is no problem in actual use.
- the harmonic current compensator 15 can perform a feed-forward control of the control system even if there is a delay component for one cycle of the control cycle. Further, the compensation operation can be improved.
- the compensation output command calculation unit 43 supplies a signal including information of 5A, for example, to the error amount calculation unit 45 as a compensation output command.
- the compensation current detector 33 supplies a signal including information of 4A, for example, to the error amount calculation means 45 as the compensation current Ia.
- the error amount calculation unit 45 calculates 1A as the error amount, and supplies a signal including information of 1A to the control amount calculation unit 47.
- the control amount calculation means 47 calculates a control amount corresponding to 1A.
- the control amount calculation unit 47 performs calculations such as P control, I control, and PI control, for example.
- the compensation output command calculation unit 43 supplies a signal including information of 15A to the error amount calculation unit 45 as a compensation output command.
- the compensation current detector 33 supplies a signal including 5A to the error amount calculation means 45 as the compensation current Ia.
- the error amount calculation unit 45 calculates 10A as the error amount, and supplies a signal including information of 10A to the control amount calculation unit 47.
- the control amount calculation means 47 calculates a control amount corresponding to 10A in order to eliminate this error 10A, that is, to increase the compensation current Ia by 10A.
- the harmonic current compensator 15 performs an operation that does not respond to an error greater than a certain level by suppressing the control amount.
- FIG. 3 is a flowchart for explaining a control example of the harmonic current compensator 15 according to the first embodiment of the present invention.
- the harmonic current compensator 15 does not determine whether the compensation current Ia exceeds the overcurrent level as control.
- the harmonic current compensator 15 determines whether or not the controlled variable exceeds the certain fixed value in the control.
- the harmonic current compensator 15 suppresses the controlled variable to the certain fixed value.
- the certain value is assumed to be a limit value will be described below.
- Step S11 The harmonic current compensator 15 determines whether or not the zero point of the power supply voltage has been detected. When the harmonic current compensator 15 detects the zero point of the power supply voltage, the process proceeds to step S12. On the other hand, when the harmonic current compensator 15 does not detect the zero point of the power supply voltage, the process proceeds to step S13.
- Step S12 The harmonic current compensator 15 sets an initial value for the compensation current Ia.
- Step S13 The harmonic current compensator 15 detects the phase ⁇ .
- Step S14 The harmonic current compensator 15 determines whether or not the control period has arrived. When the control period has arrived, the harmonic current compensator 15 proceeds to step S15. On the other hand, the harmonic current compensation apparatus 15 returns to step S13, when a control period does not arrive.
- Step S15 The harmonic current compensator 15 extracts a harmonic component of the load current IL.
- Step S16 The harmonic current compensator 15 obtains an error amount based on the harmonic component of the load current IL and the compensation current Ia.
- Step S17 The harmonic current compensator 15 determines the control amount based on the error amount.
- Step S18 When the controlled variable exceeds the limit value, the harmonic current compensator 15 proceeds to step S19. On the other hand, if the controlled variable does not exceed the limit value, the harmonic current compensator 15 proceeds to step S20.
- Step S20 The harmonic current compensator 15 generates a control signal based on the control amount.
- Step S21 The harmonic current compensator 15 controls the switching element based on the control signal.
- the harmonic current compensator 15 supplies the compensation current Ia to the power receiving point 21 according to the operation of the switching element.
- Step S23 The harmonic current compensator 15 determines whether an end command has arrived.
- the harmonic current compensator 15 ends the process when the end command arrives.
- the harmonic current compensation apparatus 15 returns to step S11, when an end command does not arrive.
- the harmonic current compensator 15 prevents the amount of control by the limiter 49 from exceeding a certain value. Therefore, the harmonic current compensator 15 is not affected by the influence of the system power supply 11 or the like even when the amount of error between the compensation output command output from the compensation output command calculating means 43 and the compensation current Ia is large. Even when the amount of change in the compensation output command increases as the change in the current IL increases, the compensation current Ia does not increase as the load current IL changes. Therefore, the harmonic current compensation device 15 can continue the operation of the harmonic generation load 13 without causing the compensation current Ia to reach the overcurrent level.
- the harmonic current compensation device 15 suppresses the control amount of the compensation current Ia and generates the compensation current Ia based on the suppressed control amount. Therefore, the harmonic current compensator 15 suppresses the upper limit of the compensation current Ia, so that even if the change in the instantaneous value of the load current IL increases due to the influence of the system power supply 11, the compensation current Ia instantaneously exceeds the compensation current Ia.
- the operation of the harmonic generation load 13 can be continued without reaching the current level. Therefore, for example, when it is assumed that the harmonic generation load 13 is a power converter and the power converter supplies power to the refrigerant circuit 17, the operation of the air conditioner including the refrigerant circuit 17 can be continued.
- the compensation current Ia is used to compensate for the harmonic component included in the load current IL input to the harmonic generation load 13.
- the present invention is not particularly limited thereto.
- a compensation voltage may be used to compensate for a harmonic component included in the voltage input to the harmonic generation load 13.
- the load input in parallel to the harmonic generation load 13 connected to the system power supply 11 and supplied from the system power supply 11 to the harmonic generation load 13 by supplying the compensation current Ia.
- a harmonic current compensator 15 for suppressing harmonic components contained in the current IL a load current detector 31 for detecting the load current IL, a compensation current detector 33 for detecting the supplied compensation current Ia, Control amount calculation for calculating the control amount of the compensation current Ia based on the harmonic component included in the load current IL detected by the load current detector 31 and the compensation current Ia detected by the compensation current detector 33
- a harmonic current compensator 15 including means 47 and a limiter 49 that suppresses the upper limit of the compensation current Ia is configured.
- the harmonic current compensator 15 suppresses the upper limit of the compensation current Ia so that even if the change in the instantaneous value of the load current IL becomes large due to the influence of the system power supply 11, the compensation current Ia is instantaneously exceeded.
- the operation of the air conditioner can be continued without reaching the current level. Therefore, the harmonic current compensator 15 can maintain the capability of the air conditioner.
- the upper limit of the compensation current Ia is set to be equal to or lower than the overcurrent level at which it is determined whether or not the operation of the harmonic generation load 13 is stopped.
- the upper limit of the control amount of the compensation current Ia may be suppressed.
- the harmonic current compensator 15 turns on the switching element included in the main circuit 53 with a control signal generated based on the suppressed control amount in order to suppress the upper limit of the control amount of the compensation current Ia. Even when the state and the OFF state are controlled, the compensation current Ia output from the main circuit 53 does not exceed the overcurrent level. Therefore, the harmonic current compensator 15 does not generate the compensation current Ia having a large amplitude value that causes the operation of the air conditioner to stop, so that the operation of the air conditioner can be continued. Therefore, the harmonic current compensator 15 can maintain the capability of the air conditioner particularly remarkably.
- FIG. Differences from the first embodiment
- the harmonic current compensator 15 according to the second embodiment limits the period during which the limiter 49 is operated.
- the harmonic current compensator 15 according to the second embodiment will be described.
- FIG. 4 is a diagram illustrating a schematic configuration of the air-conditioning system 1 including the harmonic current compensator 15 according to Embodiment 2 of the present invention.
- FIG. 5 is a diagram showing an example of operation waveforms for explaining harmonic compensation control in Embodiment 2 of the present invention.
- the harmonic current compensation device 15 according to the second embodiment further includes a storage unit 61 and a prediction unit 63 as compared with the harmonic current compensation device 15 according to the first embodiment.
- the storage unit 61 stores, for example, the phase ⁇ detected for each control cycle, the error amount obtained for each control cycle, the control amount obtained for each control cycle, and the like.
- the prediction unit 63 predicts a future control amount based on various past data and specifies a period during which the limiter 49 is operated.
- the predicting means 63 preliminarily determines a period in which the amount of change in the compensation output command is assumed to be large in one cycle of the system power supply 11, that is, the phase, and the limiter 49 only determines the determined period. Control the control amount.
- the period in which the amount of change in the compensation output command is assumed to be large is specifically focused on the periodicity of the compensation current Ia, and during one cycle of the power supply voltage of the system power supply 11, This is the timing at which the past control amount is larger than the preset set value, that is, the period corresponding to the phase within the preset range with reference to the reference phase.
- the harmonic current compensator 15 suppresses the control amount of the compensation current Ia in the period of the phase 55 ° to 65 °.
- the prediction means 63 uses the phase when the control amount of the compensation current Ia exceeds the preset set value out of the control amount of the compensation current Ia for one cycle of the system power supply 11 as the reference phase.
- the determination of the timing may be predicted by the compensation output command calculation means 43 based on the fluctuation amount of the load current IL. Further, the phase determination may be predicted based on the fluctuation amount of the power supply voltage waveform of the system power supply 11. Further, the phase may be determined for a certain period determined experimentally. It is good also as what changes dynamically based on the value detected in the past for every control period. For example, when the harmonic generation load 13 is a three-phase bridge rectifier circuit with a built-in DC reactor, the load current IL flows through 120-degree sections, each of which is obtained by sequentially dividing a DC pulsating current into three phases. The current is a rectangular wave with state distortion.
- the phase of the power supply voltage corresponding to the line voltage changes sharply at 0 °, 60 °, 180 °, and 240 ° as shown in FIG.
- the limiter 49 may be operated in accordance with the phase that changes sharply.
- FIG. 6 is a flowchart for explaining a control example of the harmonic current compensator 15 according to the second embodiment of the present invention.
- Step S41 The harmonic current compensator 15 determines whether or not the zero point of the power supply voltage has been detected. When the harmonic current compensator 15 detects the zero point of the power supply voltage, the process proceeds to step S42. On the other hand, when the harmonic current compensator 15 does not detect the zero point of the power supply voltage, the process proceeds to step S44.
- Step S42 The harmonic current compensator 15 determines whether or not the system power supply 11 has passed one cycle.
- the harmonic current compensator 15 proceeds to step S54 when one cycle of the system power supply 11 has elapsed.
- the harmonic current compensator 15 proceeds to step S43 when the system power supply 11 does not elapse for one cycle.
- Step S43 The harmonic current compensator 15 sets an initial value for the compensation current Ia.
- Step S44 The harmonic current compensator 15 detects the phase ⁇ .
- Step S45 The harmonic current compensator 15 determines whether or not the control period has arrived. When the control period has arrived, the harmonic current compensator 15 proceeds to step S46. On the other hand, the harmonic current compensation apparatus 15 returns to step S44, when a control period does not arrive.
- Step S46 The harmonic current compensator 15 extracts a harmonic component of the load current IL.
- Step S47 The harmonic current compensator 15 obtains an error amount based on the harmonic component of the load current IL and the compensation current Ia.
- Step S48 The harmonic current compensator 15 determines the control amount based on the error amount.
- Step S49 The harmonic current compensator 15 determines whether or not the controlled variable exceeds the set value. If the controlled variable exceeds the set value, the harmonic current compensator 15 proceeds to step S50. On the other hand, when the controlled variable does not exceed the set value, the harmonic current compensator 15 proceeds to step S51.
- the set value here may be the limit value of the control amount described in the first embodiment, and is different for each control amount corresponding to the phase included in the range set in advance with reference to the reference phase. It may be a limit value.
- Step S50 The harmonic current compensator 15 sets a suppression flag corresponding to each of the reference phase corresponding to the control amount exceeding the set value and the phase included in the range set in advance with reference to the reference phase.
- the harmonic current compensator 15 suppresses the control amount of the compensation current Ia in the period of 55 ° to 65 ° and the control cycle is 1 °.
- the phase of the compensation current Ia corresponds to 55 °, 56 °, 57 °, 58 °, 59 °, 60 °, 61 °, 62 °, 63 °, 64 °, and 65 °, respectively.
- Set suppression flag to 1 in data may include, for example, the phase ⁇ , the amplitude value, and the suppression flag for the compensation current Ia.
- Step S51 The harmonic current compensator 15 suppresses the control amount.
- Step S52 The harmonic current compensator 15 generates a control signal based on the control amount.
- Step S53 The harmonic current compensator 15 controls the switching element based on the control signal.
- Step S54 The harmonic current compensator 15 supplies the compensation current Ia to the power receiving point 21 according to the operation of the switching element.
- Step S55 The harmonic current compensator 15 determines whether or not the zero point of the power supply voltage has been detected. When the harmonic current compensator 15 detects the zero point of the power supply voltage, the process proceeds to step S56. On the other hand, if the harmonic current compensator 15 does not detect the zero point of the power supply voltage, the process proceeds to step S57.
- Step S56 The harmonic current compensator 15 sets an initial value for the compensation current Ia. For example, when the harmonic current compensator 15 detects the zero point of the power supply voltage, the harmonic current compensator 15 shifts to a new power supply voltage period in the next control period, and thus the compensation current Ia corresponding to one new power supply voltage period An initial value is set for the compensation current Ia on the assumption that no past data exists.
- Step S57 The harmonic current compensator 15 detects the phase ⁇ .
- Step S58 The harmonic current compensator 15 determines whether or not the control period has arrived. When the control period has arrived, the harmonic current compensator 15 proceeds to step S59. On the other hand, the harmonic current compensator 15 returns to step S57 when the control period does not arrive.
- Step S59 The harmonic current compensator 15 extracts a harmonic component of the load current IL.
- Step S60 The harmonic current compensator 15 obtains an error amount based on the harmonic component of the load current IL and the compensation current Ia.
- Step S61 The harmonic current compensator 15 determines the control amount based on the error amount.
- Step S62 The harmonic current compensator 15 determines whether or not a suppression flag corresponding to the control amount is set. When the suppression flag corresponding to the control amount is set, the harmonic current compensator 15 proceeds to step S63. On the other hand, when the suppression flag corresponding to the control amount is not set, the harmonic current compensator 15 proceeds to step S64.
- Step S63 The harmonic current compensator 15 suppresses the control amount. That is, the harmonic current compensator 15 performs an operation of suppressing the control amount during the period in which the suppression flag corresponding to the control amount is set.
- Step S64 The harmonic current compensator 15 generates a control signal based on the control amount.
- Step S65 The harmonic current compensator 15 controls the switching element based on the control signal.
- Step S66 The harmonic current compensator 15 supplies the compensation current Ia to the power receiving point 21 according to the operation of the switching element.
- Step S67 The harmonic current compensator 15 determines whether an end command has arrived. The harmonic current compensator 15 ends the process when the end command arrives. On the other hand, the harmonic current compensator 15 returns to step S55 when the end command does not arrive.
- the harmonic current compensator 15 limits the period for suppressing the control amount of the compensation current Ia, that is, the phase for suppressing the control amount of the compensation current Ia. Therefore, in the case of the phase in which the harmonic current compensator 15 does not suppress the control amount of the compensation current Ia, the harmonic current component of the load current IL is canceled by the compensation current Ia and the control amount of the compensation current Ia is suppressed. The load current IL is suppressed by the compensation current Ia. Therefore, the harmonic current compensator 15 does not perform the suppression operation of the control amount of the compensation current Ia except during the period of suppressing the control amount of the compensation current Ia.
- the harmonic current compensator 15 avoids the stop of the operation of the harmonic generation load 13 due to the compensation current Ia exceeding the overcurrent level while suppressing the harmonic component of the load current IL to some extent. Can do.
- the storage unit 61 that stores the compensation current Ia and the phase corresponding to the compensation current Ia, and the compensation current Ia based on the compensation current Ia stored in the storage unit 61.
- the harmonic current compensator 15 limits the period for suppressing the control amount of the compensation current Ia, that is, the phase for suppressing the control amount of the compensation current Ia. Therefore, in the case of the phase in which the harmonic current compensator 15 does not suppress the control amount of the compensation current Ia, the harmonic current component of the load current IL is canceled by the compensation current Ia and the control amount of the compensation current Ia is suppressed. The load current IL is suppressed by the compensation current Ia. Therefore, the harmonic current compensator 15 avoids stopping the operation of the harmonic generation load 13 due to the compensation current Ia exceeding the overcurrent level while suppressing the harmonic component of the load current IL to some extent. Can do.
- the predicting means 63 is based on the control amount of the compensation current Ia for one cycle of the system power supply 11 and the phase when the control amount of the compensation current Ia exceeds a preset set value. May be predicted.
- the harmonic current compensator 15 predicts the phase when the control amount of the compensation current Ia exceeds a preset value based on the control amount of the past compensation current Ia. Future driving conditions can be improved based on driving conditions.
- the harmonic current compensator 15 suppresses the upper limit of the compensation current Ia so that the compensation current Ia is particularly noticeable even if the change in the instantaneous value of the load current IL increases due to the influence of the system power supply 11.
- the operation of the air conditioner can be continued without instantaneously reaching the overcurrent level. Therefore, the harmonic current compensator 15 can maintain the capability of the air conditioner.
- Embodiment 3 (Differences from Embodiments 1 and 2)
- the harmonic current compensator 15 according to the third embodiment suppresses the compensation output command of the compensation output command calculation means 43.
- FIG. 7 is a diagram illustrating a schematic configuration of the air-conditioning system 1 including the harmonic current compensator 15 according to Embodiment 3 of the present invention.
- the harmonic current compensator 15 further includes a compensation output command suppression determination unit 65 and a compensation output command suppression calculation unit 67 as compared with the first embodiment.
- the compensation output command suppression determination means 65 compares the compensation current Ia with a preset suppression determination value to determine whether to suppress the compensation output command.
- the suppression determination value is, for example, a current value, and is set to a smaller value than the overcurrent level. Specifically, the compensation output command suppression determination means 65 determines that the compensation current Ia can be excessive when one of the three-phase compensation currents Ia reaches a preset suppression determination value.
- the output command suppression calculation means 67 is made to suppress the compensation output command. Compensation output command suppression calculation means 67 suppresses the command value of the harmonic component of load current IL.
- the suppression determination value may be set by paying attention to the periodicity of the compensation current Ia. For example, the timing at which the previous or past compensation current Ia is larger than a preset value in one cycle of the power supply voltage, that is, a period in which a margin is given before and after the reference phase with the phase as the reference phase. May be set based on Further, the suppression determination value may be determined experimentally. Moreover, it may change dynamically based on the value detected in the past for every control period.
- FIG. 8 is a flowchart for explaining a control example of the harmonic current compensator 15 according to the third embodiment of the present invention.
- Step S81 The harmonic current compensator 15 determines whether or not the zero point of the power supply voltage has been detected. When the harmonic current compensator 15 detects the zero point of the power supply voltage, the process proceeds to step S82. On the other hand, when the harmonic current compensator 15 does not detect the zero point of the power supply voltage, the process proceeds to step S83.
- Step S82 The harmonic current compensator 15 sets an initial value for the compensation current Ia.
- Step S83 The harmonic current compensator 15 detects the phase ⁇ .
- Step S84 The harmonic current compensator 15 determines whether or not the control period has arrived. When the control period has arrived, the harmonic current compensator 15 proceeds to step S85. On the other hand, the harmonic current compensation apparatus 15 returns to step S83, when a control period does not arrive.
- Step S85 The harmonic current compensator 15 extracts a harmonic component of the load current IL.
- Step S86 The harmonic current compensator 15 determines whether or not to perform suppression determination of the command value of the harmonic component of the load current IL.
- the process proceeds to step S96.
- the harmonic current compensator 15 does not perform the suppression determination of the command value of the harmonic component of the load current IL, the process proceeds to step S87.
- Step S87 The harmonic current compensator 15 obtains an error amount based on the harmonic component of the load current IL and the compensation current Ia.
- Step S88 The harmonic current compensator 15 determines the control amount based on the error amount.
- Step S89 The harmonic current compensator 15 determines whether or not the suppression determination of the harmonic component of the load current IL has been performed. When the harmonic current compensator 15 determines to suppress the harmonic component of the load current IL, the harmonic current compensator 15 proceeds to step S92. On the other hand, the harmonic current compensator 15 proceeds to step S90 when the suppression determination of the harmonic component of the load current IL is not performed.
- Step S90 The harmonic current compensator 15 determines whether or not the controlled variable exceeds the set value. If the controlled variable exceeds the set value, the harmonic current compensator 15 proceeds to step S91. On the other hand, when the controlled variable does not exceed the set value, the harmonic current compensator 15 proceeds to step S92.
- Step S92 The harmonic current compensator 15 generates a control signal based on the control amount.
- Step S93 The harmonic current compensator 15 controls the switching element based on the control signal.
- Step S94 The harmonic current compensator 15 supplies the compensation current Ia to the power receiving point 21 according to the operation of the switching element.
- Step S95 The harmonic current compensator 15 determines whether an end command has arrived.
- the harmonic current compensator 15 ends the process when the end command arrives.
- the harmonic current compensator 15 returns to step S81 when the end command does not arrive.
- Step S96 The harmonic current compensator 15 determines whether or not one of the three-phase compensation currents Ia has reached the suppression determination value. When the harmonic current compensator 15 has reached the suppression determination value even in one of the three-phase compensation currents Ia, the harmonic current compensator 15 proceeds to step S97. On the other hand, when none of the three-phase compensation currents Ia has reached the suppression determination value, the harmonic current compensator 15 proceeds to step S89.
- Step S97 The harmonic current compensator 15 suppresses the command value of the harmonic component of the load current IL.
- the harmonic current compensator 15 determines whether the harmonic current compensator 15 suppresses the compensation current Ia based on the suppression determination value that is smaller than the overcurrent level. In order to suppress the command value of the harmonic component of the load current IL, the command value of the harmonic component of the load current IL is suppressed before the compensation current Ia reaches the overcurrent level. Therefore, the harmonic current compensator 15 can continue the operation of the harmonic generation load 13 without causing the compensation current Ia to reach the overcurrent level while suppressing the harmonic component of the load current IL.
- the suppression determination value for determining whether or not to suppress the compensation current Ia is further provided with the compensation output command suppression calculation means 67 that suppresses the amplitude of the harmonic component included in the load current IL.
- the system power supply 11 is a three-phase AC power supply, and the compensation output command suppression calculation means 67. Suppresses the command value of the harmonic component of the load current IL when at least one phase of the compensation current Ia detected by the compensation current detector 33 has reached a preset suppression determination value. You may make it do.
- the harmonic current compensator 15 determines whether to suppress the compensation current Ia based on a suppression determination value that is smaller than the overcurrent level, and determines the harmonic component command value of the load current IL. Therefore, the command value of the harmonic component of the load current IL is suppressed before the compensation current Ia reaches the overcurrent level. Therefore, the harmonic current compensator 15 can continue the operation of the harmonic generation load 13 without suppressing the harmonic component of the load current IL and without reaching the overcurrent level of the compensation current Ia.
- the power supply cycle of the system power supply 11 and the control cycle for calculating the control amount of the compensation current Ia included in the power supply cycle of the system power supply 11 are provided. May suppress the command value of the harmonic component of the load current IL based on the compensation current Ia and the suppression determination value for each control period.
- the harmonic current compensator 15 can repeatedly suppress the command value of the harmonic component of the load current IL during one power cycle.
- the harmonic current compensator 15 suppresses the upper limit of the compensation current Ia so that the compensation current Ia is particularly noticeable even if the change in the instantaneous value of the load current IL increases due to the influence of the system power supply 11.
- the operation of the air conditioner can be continued without instantaneously reaching the overcurrent level. Therefore, the harmonic current compensator 15 can maintain the capability of the air conditioner.
- Embodiment 4 FIG. (Differences from Embodiments 1 to 3)
- the harmonic current compensator 15 according to Embodiment 4 is configured to be able to arbitrarily set the suppression determination value.
- FIG. 9 is a diagram illustrating a schematic configuration of the air conditioning system 1 including the harmonic current compensator 15 according to the fourth embodiment of the present invention. As shown in FIG. 9, the harmonic current compensator 15 further includes a compensation output command suppression determination level setting unit 69 as compared with the configuration of the third embodiment.
- Compensation output command suppression determination level setting means 69 determines the suppression determination value arbitrarily settable. Such suppression determination value is set according to the unbalanced phase voltage of the system power supply 11 or the magnitude of voltage distortion, and as the phase voltage of the system power supply 11 is unbalanced, or As the voltage distortion increases, the control amount of the compensation current Ia increases, so that the possibility that the compensation current Ia reaches the overcurrent level increases.
- the harmonic current compensator 15 lowers the suppression determination value in advance and suppresses the compensation output command, which is the output of the compensation output command calculation unit 43, in a large amount. As a result, the peak value of the compensation current Ia is obtained. The operation is further suppressed to a low level.
- the suppression determination value may be set after product installation.
- the initial setting value of the suppression determination value may be the lowest suppression determination value assuming an ideal power supply voltage of the system power supply 11.
- the suppression determination value may be a value that takes into account the state of the power supply voltage of the average system power supply 11 from past experience. That is, the suppression determination value is not fixed to one value, and may be changed as appropriate according to installation conditions and the like.
- FIG. 10 is a flowchart for explaining a control example of the harmonic current compensator 15 according to the fourth embodiment of the present invention. Note that the processing from step S112 to step S128 is the same as the operation of the third embodiment, and thus the description thereof is omitted here.
- Step S111 The harmonic current compensator 15 determines whether or not a suppression determination value is set. When the suppression determination value is set, the harmonic current compensator 15 proceeds to step S112. On the other hand, the harmonic current compensation apparatus 15 returns to step S111, when a suppression determination value is not set.
- the harmonic current compensator 15 can arbitrarily set the suppression determination value, so that the interphase voltage imbalance of the system power supply 11 or the voltage distortion of the system power supply 11 etc. A suppression determination value can be set according to the influence. Therefore, the harmonic current compensator 15 can avoid excessively suppressing the compensation current Ia. In addition, since the harmonic current compensator 15 can arbitrarily set a suppression determination value that serves as a suppression trigger for the compensation current Ia, the insufficient suppression of the compensation current Ia can be resolved.
- the fourth embodiment further includes the compensation output command suppression determination level setting means 69 for setting the suppression determination value, and the compensation output command suppression calculation means 67 is set by the compensation output command suppression determination level setting means 69. Based on the suppression determination value, the command value of the harmonic component of the load current IL may be suppressed.
- the harmonic current compensator 15 can arbitrarily set the suppression determination value, so that the suppression determination value depends on the influence of the interphase voltage imbalance of the system power supply 11 or the voltage distortion of the system power supply 11. Can be set. Therefore, the harmonic current compensator 15 can avoid excessively suppressing the compensation current Ia. In addition, since the harmonic current compensator 15 can arbitrarily set a suppression determination value that serves as a suppression trigger for the compensation current Ia, the insufficient suppression of the compensation current Ia can be resolved.
- the harmonic current compensator 15 suppresses the upper limit of the compensation current Ia so that the compensation current Ia is particularly noticeable even if the change in the instantaneous value of the load current IL increases due to the influence of the system power supply 11.
- the operation of the air conditioner can be continued without instantaneously reaching the overcurrent level. Therefore, the harmonic current compensator 15 can maintain the capability of the air conditioner.
- the power conversion device includes a rectifier circuit with a reactor as common to the first to fourth embodiments.
- the output of the power conversion device is relatively small in fluctuation, and an equivalent load current IL repeatedly flows to the power conversion device, so that the power conversion device supplies power to the air conditioner.
- the harmonic current compensator 15 is particularly effective.
Abstract
Description
(実施の形態1の構成)
図1は、本発明の実施の形態1における高調波電流補償装置15を備えた空気調和システム1の概略構成を示す図である。空気調和システム1は、例えば、高調波電流補償装置15が、交流電源等の系統電源11から流れる電流の高調波成分を抑制することで、高調波電流補償装置15で負荷電流ILを補償する。
図3は、本発明の実施の形態1における高調波電流補償装置15の制御例を説明するフローチャートである。なお、高調波電流補償装置15は、制御としては補償電流Iaが過電流レベルを超えるか否かを判定しない。ここでは、制御量がある一定値を超えると補償電流Iaが過電流レベルに達することを試験的に確認しておいてあると想定する。そして、高調波電流補償装置15は、制御においては制御量がそのある一定値を超えるか否かを判定する。高調波電流補償装置15は、制御量がそのある一定値を超える場合、制御量をそのある一定値に抑制する。なお、そのある一定値をリミット値と想定した場合について以降で説明する。
高調波電流補償装置15は、電源電圧のゼロ点を検出したか否かを判定する。高調波電流補償装置15は、電源電圧のゼロ点を検出した場合、ステップS12に進む。一方、高調波電流補償装置15は、電源電圧のゼロ点を検出しない場合、ステップS13に進む。
高調波電流補償装置15は、補償電流Iaに初期値を設定する。
高調波電流補償装置15は、位相θを検出する。
高調波電流補償装置15は、制御周期が到来したか否かを判定する。高調波電流補償装置15は、制御周期が到来した場合、ステップS15に進む。一方、高調波電流補償装置15は、制御周期が到来しない場合、ステップS13に戻る。
高調波電流補償装置15は、負荷電流ILの高調波成分を抽出する。
高調波電流補償装置15は、負荷電流ILの高調波成分と、補償電流Iaとに基づいて、誤差量を求める。
高調波電流補償装置15は、誤差量に基づいて制御量を求める。
高調波電流補償装置15は、制御量がリミット値を超える場合、ステップS19に進む。一方、高調波電流補償装置15は、制御量がリミット値を超えない場合、ステップS20に進む。
高調波電流補償装置15は、制御量をリミット値に抑制する。
高調波電流補償装置15は、制御量に基づいて制御信号を生成する。
高調波電流補償装置15は、制御信号に基づいてスイッチング素子を制御する。
高調波電流補償装置15は、スイッチング素子の動作に応じて受電点21に補償電流Iaを供給する。
高調波電流補償装置15は、終了指令が到来したか否かを判定する。高調波電流補償装置15は、終了指令が到来した場合、処理を終了する。一方、高調波電流補償装置15は、終了指令が到来しない場合、ステップS11に戻る。
以上の説明から、高調波電流補償装置15は、リミッタ49で制御量が一定値以上にはならないようにしている。よって、高調波電流補償装置15は、補償出力指令演算手段43から出力される補償出力指令と、補償電流Iaとの誤差量が大きいときであっても、つまり、系統電源11等の影響で負荷電流ILの変化が大きくなることに伴って補償出力指令の変化量が大きくなるときであっても、負荷電流ILの変化に伴って補償電流Iaが大きくなることがない。したがって、高調波電流補償装置15は、補償電流Iaを過電流レベルに到達させることなく、高調波発生負荷13の運転を継続することができる。
(実施例の形態1との相違点)
実施の形態2に係る高調波電流補償装置15は、リミッタ49を動作させる期間を限定する。以下、実施の形態2に係る高調波電流補償装置15について説明する。
図4は、本発明の実施の形態2における高調波電流補償装置15を備えた空気調和システム1の概略構成を示す図である。図5は、本発明の実施の形態2における高調波補償制御を説明する動作波形の一例を示す図である。
図6は、本発明の実施の形態2における高調波電流補償装置15の制御例を説明するフローチャートである。
高調波電流補償装置15は、電源電圧のゼロ点を検出したか否かを判定する。高調波電流補償装置15は、電源電圧のゼロ点を検出した場合、ステップS42に進む。一方、高調波電流補償装置15は、電源電圧のゼロ点を検出しない場合、ステップS44に進む。
高調波電流補償装置15は、系統電源11が1周期経過したか否かを判定する。高調波電流補償装置15は、系統電源11が1周期経過した場合、ステップS54に進む。一方、高調波電流補償装置15は、系統電源11が1周期経過しない場合、ステップS43に進む。
高調波電流補償装置15は、補償電流Iaに初期値を設定する。
高調波電流補償装置15は、位相θを検出する。
高調波電流補償装置15は、制御周期が到来したか否かを判定する。高調波電流補償装置15は、制御周期が到来した場合、ステップS46に進む。一方、高調波電流補償装置15は、制御周期が到来しない場合、ステップS44に戻る。
高調波電流補償装置15は、負荷電流ILの高調波成分を抽出する。
高調波電流補償装置15は、負荷電流ILの高調波成分と、補償電流Iaとに基づいて、誤差量を求める。
高調波電流補償装置15は、誤差量に基づいて制御量を求める。
高調波電流補償装置15は、制御量が設定値を超えるか否かを判定する。高調波電流補償装置15は、制御量が設定値を超える場合、ステップS50に進む。一方、高調波電流補償装置15は、制御量が設定値を超えない場合、ステップS51に進む。なお、ここでいう設定値は、実施の形態1で説明した制御量のリミット値であってもよく、基準位相を基準として予め設定された範囲内に含まれる位相に対応する制御量ごとに異なるリミット値であってよい。
高調波電流補償装置15は、設定値を超えた制御量に対応する基準位相と、基準位相を基準として予め設定された範囲内に含まれる位相とのそれぞれに対応する抑制フラグを設定する。
高調波電流補償装置15は、制御量を抑制する。
高調波電流補償装置15は、制御量に基づいて制御信号を生成する。
高調波電流補償装置15は、制御信号に基づいてスイッチング素子を制御する。
高調波電流補償装置15は、スイッチング素子の動作に応じて受電点21に補償電流Iaを供給する。
高調波電流補償装置15は、電源電圧のゼロ点を検出したか否かを判定する。高調波電流補償装置15は、電源電圧のゼロ点を検出した場合、ステップS56に進む。一方、高調波電流補償装置15は、電源電圧のゼロ点を検出しない場合、ステップS57に進む。
高調波電流補償装置15は、補償電流Iaに初期値を設定する。例えば、高調波電流補償装置15は、電源電圧のゼロ点を検出すると、次の制御周期では、新たな電源電圧の周期に移行するため、新たな電源電圧1周期分に対応する補償電流Iaの過去データは存在しないという想定で、補償電流Iaに初期値を設定する。
高調波電流補償装置15は、位相θを検出する。
高調波電流補償装置15は、制御周期が到来したか否かを判定する。高調波電流補償装置15は、制御周期が到来した場合、ステップS59に進む。一方、高調波電流補償装置15は、制御周期が到来しない場合、ステップS57に戻る。
高調波電流補償装置15は、負荷電流ILの高調波成分を抽出する。
高調波電流補償装置15は、負荷電流ILの高調波成分と、補償電流Iaとに基づいて、誤差量を求める。
高調波電流補償装置15は、誤差量に基づいて制御量を求める。
高調波電流補償装置15は、制御量に対応する抑制フラグが設定されているか否かを判定する。高調波電流補償装置15は、制御量に対応する抑制フラグが設定されている場合、ステップS63に進む。一方、高調波電流補償装置15は、制御量に対応する抑制フラグが設定されていない場合、ステップS64に進む。
高調波電流補償装置15は、制御量を抑制する。つまり、高調波電流補償装置15は、制御量に対応する抑制フラグが設定されている期間では、制御量を抑制する動作を行う。
高調波電流補償装置15は、制御量に基づいて制御信号を生成する。
高調波電流補償装置15は、制御信号に基づいてスイッチング素子を制御する。
高調波電流補償装置15は、スイッチング素子の動作に応じて受電点21に補償電流Iaを供給する。
高調波電流補償装置15は、終了指令が到来したか否かを判定する。高調波電流補償装置15は、終了指令が到来した場合、処理を終了する。一方、高調波電流補償装置15は、終了指令が到来しない場合、ステップS55に戻る。
以上の説明から、本実施の形態2に係る高調波電流補償装置15は、補償電流Iaの制御量を抑制する期間、すなわち、補償電流Iaの制御量を抑制する位相を限定する。よって、高調波電流補償装置15は、補償電流Iaの制御量を抑制しない位相の場合、補償電流Iaで負荷電流ILの高調波成分を相殺し、補償電流Iaの制御量を抑制する位相の場合、補償電流Iaで負荷電流ILを抑制する。よって、高調波電流補償装置15は、補償電流Iaの制御量を抑制する期間以外では、補償電流Iaの制御量の抑制動作を行わないため、従来と同等の負荷電流ILの補償量を得ると共に、補償電流Iaの制御量を抑制する期間では、ある程度は負荷電流ILの高調波成分を抑制することができる。したがって、高調波電流補償装置15は、ある程度は負荷電流ILの高調波成分を抑制しつつ、補償電流Iaが過電流レベルを超えることに起因する高調波発生負荷13の運転の停止を回避することができる。
(実施の形態1、2との相違点)
実施の形態3に係る高調波電流補償装置15は、補償出力指令演算手段43の補償出力指令を抑制する。
図7は、本発明の実施の形態3における高調波電流補償装置15を備えた空気調和システム1の概略構成を示す図である。図7に示すように、高調波電流補償装置15は、実施の形態1と比べ、補償出力指令抑制判定手段65と、補償出力指令抑制演算手段67とをさらに備えている。
図8は、本発明の実施の形態3における高調波電流補償装置15の制御例を説明するフローチャートである。
高調波電流補償装置15は、電源電圧のゼロ点を検出したか否かを判定する。高調波電流補償装置15は、電源電圧のゼロ点を検出した場合、ステップS82に進む。一方、高調波電流補償装置15は、電源電圧のゼロ点を検出しない場合、ステップS83に進む。
高調波電流補償装置15は、補償電流Iaに初期値を設定する。
高調波電流補償装置15は、位相θを検出する。
高調波電流補償装置15は、制御周期が到来したか否かを判定する。高調波電流補償装置15は、制御周期が到来した場合、ステップS85に進む。一方、高調波電流補償装置15は、制御周期が到来しない場合、ステップS83に戻る。
高調波電流補償装置15は、負荷電流ILの高調波成分を抽出する。
高調波電流補償装置15は、負荷電流ILの高調波成分の指令値の抑制判定を行うか否かを判定する。高調波電流補償装置15は、負荷電流ILの高調波成分の指令値の抑制判定を行う場合、ステップS96に進む。一方、高調波電流補償装置15は、負荷電流ILの高調波成分の指令値の抑制判定を行わない場合、ステップS87に進む。
高調波電流補償装置15は、負荷電流ILの高調波成分と、補償電流Iaとに基づいて、誤差量を求める。
高調波電流補償装置15は、誤差量に基づいて制御量を求める。
高調波電流補償装置15は、負荷電流ILの高調波成分の抑制判定を行ったか否かを判定する。高調波電流補償装置15は、負荷電流ILの高調波成分の抑制判定を行った場合、ステップS92に進む。一方、高調波電流補償装置15は、負荷電流ILの高調波成分の抑制判定を行っていない場合、ステップS90に進む。
高調波電流補償装置15は、制御量が設定値を超えるか否かを判定する。高調波電流補償装置15は、制御量が設定値を超える場合、ステップS91に進む。一方、高調波電流補償装置15は、制御量が設定値を超えない場合、ステップS92に進む。
高調波電流補償装置15は、制御量を抑制する。
高調波電流補償装置15は、制御量に基づいて制御信号を生成する。
高調波電流補償装置15は、制御信号に基づいてスイッチング素子を制御する。
高調波電流補償装置15は、スイッチング素子の動作に応じて受電点21に補償電流Iaを供給する。
高調波電流補償装置15は、終了指令が到来したか否かを判定する。高調波電流補償装置15は、終了指令が到来した場合、処理を終了する。一方、高調波電流補償装置15は、終了指令が到来しない場合、ステップS81に戻る。
高調波電流補償装置15は、三相の補償電流Iaのうち、一相でも抑制判定値に達しているか否かを判定する。高調波電流補償装置15は、三相の補償電流Iaのうち、一相でも抑制判定値に達している場合、ステップS97に進む。一方、高調波電流補償装置15は、三相の補償電流Iaのうち、何れの相も抑制判定値に達していない場合、ステップS89に進む。
高調波電流補償装置15は、負荷電流ILの高調波成分の指令値を抑制する。
以上の説明から、本実施の形態3に係る高調波電流補償装置15は、高調波電流補償装置15は、過電流レベルと比べて小さい抑制判定値に基づいて、補償電流Iaを抑制させるか否かを判定し、負荷電流ILの高調波成分の指令値を抑制するため、補償電流Iaが過電流レベルに達する前に、負荷電流ILの高調波成分の指令値を抑制する。よって、高調波電流補償装置15は、負荷電流ILの高調波成分を抑制しつつ、補償電流Iaを過電流レベルに到達させることなく、高調波発生負荷13の運転を継続させることができる。
(実施の形態1~3との相違点)
実施の形態4に係る高調波電流補償装置15は、抑制判定値を任意に設定自在に構成されている。
図9は、本発明の実施の形態4における高調波電流補償装置15を備えた空気調和システム1の概略構成を示す図である。図9に示すように、高調波電流補償装置15は、実施の形態3の構成に比べ、補償出力指令抑制判定レベル設定手段69をさらに備えている。
図10は、本発明の実施の形態4における高調波電流補償装置15の制御例を説明するフローチャートである。なお、ステップS112~ステップS128の処理は、実施の形態3の動作と同様であるため、ここではその説明を省略する。
高調波電流補償装置15は、抑制判定値が設定されたか否かを判定する。高調波電流補償装置15は、抑制判定値が設定された場合、ステップS112に進む。一方、高調波電流補償装置15は、抑制判定値が設定されない場合、ステップS111に戻る。
以上の説明から、本実施の形態4に係る高調波電流補償装置15は、任意に抑制判定値を設定することができるので、系統電源11の相間電圧不平衡又は系統電源11の電圧歪み等の影響に応じて抑制判定値を設定することができる。よって、高調波電流補償装置15は、補償電流Iaを過度に抑制することを回避することができる。また、高調波電流補償装置15は、補償電流Iaの抑制トリガとなる抑制判定値を任意に設定することができるので、補償電流Iaの抑制不足を解消することができる。
Claims (8)
- 系統電源に接続された負荷に並列に接続され、補償電流を供給することで、前記系統電源から前記負荷に入力される負荷電流に含まれる高調波成分を抑制する高調波電流補償装置であって、
前記負荷電流を検出する負荷電流検出手段と、
供給された前記補償電流を検出する補償電流検出手段と、
前記負荷電流検出手段で検出された前記負荷電流に含まれる前記高調波成分と、前記補償電流検出手段で検出された前記補償電流と、に基づいて、前記補償電流の制御量を演算する制御量演算手段と、
前記補償電流の上限を抑制するリミッタと、
を備えた高調波電流補償装置。 - 前記補償電流の制御量の上限が、前記負荷の運転を停止させるか否かが判定される電流閾値以下に設定されてあって、
前記リミッタは、
前記補償電流の上限が、前記電流閾値を超える場合、前記補償電流の制御量の上限を抑制する
請求項1に記載の高調波電流補償装置。 - 前記補償電流と、当該補償電流に対応する位相と、を記憶する記憶手段と、
前記記憶手段に記憶されている前記補償電流に基づいて、前記補償電流が予め設定された設定値を超えるときの位相を予測する予測手段と、
をさらに備え、
前記リミッタは、
前記予測手段で予測された位相を基準として予め設定された範囲内にある位相に対応する前記補償電流の制御量を抑制する
請求項2に記載の高調波電流補償装置。 - 前記予測手段は、
前記系統電源の1周期分の前記補償電流の制御量に基づいて、前記補償電流の制御量が予め設定された設定値を超えるときの位相を予測する
請求項3に記載の高調波電流補償装置。 - 前記負荷電流に含まれる前記高調波成分の振幅を抑制する抑制演算手段をさらに備え、
前記補償電流を抑制させるか否かが判定される抑制判定値が、前記負荷の運転を停止させるか否かが判定される電流閾値未満に設定されてあって、
前記系統電源は、
三相交流電源であって、
前記抑制演算手段は、
前記補償電流検出手段で検出された前記補償電流のうち、少なくとも一相の前記補償電流が予め設定された抑制判定値に達している場合、前記負荷電流の前記高調波成分の指令値を抑制する
請求項1又は2に記載の高調波電流補償装置。 - 前記系統電源の電源周期と、
前記系統電源の電源周期に含まれる前記補償電流の制御量を演算する制御周期と、を有し、
前記抑制演算手段は、
前記制御周期ごとに、前記補償電流と、前記抑制判定値と、に基づいて、前記負荷電流の前記高調波成分の指令値を抑制する
請求項5に記載の高調波電流補償装置。 - 前記抑制判定値を設定する抑制判定レベル設定手段をさらに備え、
前記抑制演算手段は、
前記抑制判定レベル設定手段で設定された前記抑制判定値に基づいて、前記負荷電流の前記高調波成分の指令値を抑制する
請求項5又は6に記載の高調波電流補償装置。 - 請求項1~7の何れか一項に記載の高調波電流補償装置と、
前記系統電源と、
前記系統電源に接続され、前記系統電源から供給される電流で駆動する冷媒回路と、
を備えた空気調和システム。
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WO2018109805A1 (ja) * | 2016-12-12 | 2018-06-21 | 三菱電機株式会社 | 高調波電流補償装置および空気調和システム |
JP2019092287A (ja) * | 2017-11-14 | 2019-06-13 | 三菱重工サーマルシステムズ株式会社 | アクティブフィルタ、制御方法及びプログラム |
JP7014567B2 (ja) | 2017-11-14 | 2022-02-01 | 三菱重工サーマルシステムズ株式会社 | アクティブフィルタ、制御方法及びプログラム |
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JPWO2015151205A1 (ja) | 2017-04-13 |
CN105940585A (zh) | 2016-09-14 |
JP6095849B2 (ja) | 2017-03-15 |
CN105940585B (zh) | 2018-10-02 |
EP3128636A1 (en) | 2017-02-08 |
US10250037B2 (en) | 2019-04-02 |
US20160344185A1 (en) | 2016-11-24 |
EP3128636B1 (en) | 2019-04-24 |
EP3128636A4 (en) | 2017-11-22 |
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