WO2010143511A1 - 変圧器の制御装置 - Google Patents
変圧器の制御装置 Download PDFInfo
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- WO2010143511A1 WO2010143511A1 PCT/JP2010/058569 JP2010058569W WO2010143511A1 WO 2010143511 A1 WO2010143511 A1 WO 2010143511A1 JP 2010058569 W JP2010058569 W JP 2010058569W WO 2010143511 A1 WO2010143511 A1 WO 2010143511A1
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0032—Control circuits allowing low power mode operation, e.g. in standby mode
- H02M1/0035—Control circuits allowing low power mode operation, e.g. in standby mode using burst mode control
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1588—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load comprising at least one synchronous rectifier element
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2201/00—Indexing scheme relating to controlling arrangements characterised by the converter used
- H02P2201/07—DC-DC step-up or step-down converter inserted between the power supply and the inverter supplying the motor, e.g. to control voltage source fluctuations, to vary the motor speed
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Definitions
- This invention relates to the control apparatus which controls a transformer according to the loss of the whole load drive system containing a transformer and load.
- FIG. 12 is a schematic block diagram of the motor driving device disclosed in Patent Document 1.
- control device 30 receives power supply current Ib from current sensor 11 and reactor current IL from current sensor 18.
- Control device 30 detects maximum value ILmax and minimum value ILmin based on reactor current IL, and reactor current IL crosses the zero point based on detected maximum value ILmax, minimum value ILmin, and power supply current Ib. It is determined whether or not.
- Control device 30 generates signal PWMS and outputs it to boost converter 12 when reactor current IL crosses the zero point.
- Boost converter 12 stops the boost operation or the step-down operation by the switching operation according to signal PWMS.
- FIG. 13 is a circuit diagram showing a control system of the DC / DC converter disclosed in Patent Document 2.
- the voltage of the DC power source 1 is converted to a DC output of a constant voltage by the on / off operation of the switch element 2, and an oscillation period and a forced stop period are provided at light loads including no load. 2 is operated intermittently, the output signal from the output voltage detection adjustment circuit 6 for controlling the output voltage to be constant is set as a first command value for determining the ON / OFF timing of the switch element 2, and no load is set.
- control device 30 controls boost converter 12 to stop the switching operation.
- boost converter 12 When the switching operation of boost converter 12 is stopped, switching loss can be reduced.
- the output voltage of boost converter 12 drops toward the output voltage of DC power supply 1 due to power consumption at the load.
- the load When the output voltage of the boost converter 12 drops, the load is separated from the optimum efficiency operating point of the load. Therefore, it is not preferable to stop the switching operation of the boost converter 12.
- the switching element 2 is operated intermittently at light loads including no load. For this reason, the switching loss and conduction loss of the DC / DC converter at the time of light load including no load can be reduced. Further, the voltage drop of the output voltage (transformed voltage) of the DC / DC converter is suppressed by intermittent oscillation control in which the forced stop period and the oscillation period are alternately repeated. Therefore, when the load is an electric motor, the DC / DC converter can maintain an output voltage at which the electric motor can operate at the optimum efficiency operating point.
- the loss increases because the reactor current increases when the forced stop period shifts to the oscillation period. The increase in the reactor current differs depending on the step-up ratio of the DC / DC converter when the forced stop period is shifted to the oscillation period.
- FIG. 15 is a circuit diagram showing a current flow when the output voltage of the DC / DC converter is decreasing during the forced stop period.
- FIGS. 16A to 16C are graphs showing the relationship between the rotation speed and torque of the motor and the orthogonal region and field weakening region of the motor according to the magnitude of the input voltage. As shown in FIGS. 16A to 16C, the orthogonal region and the field weakening region of the electric motor differ depending on the input voltage.
- the load is an electric motor
- the output voltage of the DC / DC converter that is, the input voltage of the electric motor drops during the forced stop period, as indicated by the dotted arrows in FIGS. 16 (a) and 16 (b).
- the operating point in the orthogonal region may move to the field weakening region.
- a field weakening current is generated in the electric motor, and an on-loss and a switching loss of an inverter provided between the DC / DC converter and the electric motor as part of the load increase.
- FIG. 18 is a circuit diagram showing a current flow during which the output voltage of the DC / DC converter is increasing during the forced stop period. Even if the output voltage of the DC / DC converter increases, the operating point remains in the orthogonal region as shown by the dashed line arrows in FIGS. 16B and 16C, but the switching loss of the inverter increases. Resulting in.
- An object of the present invention is to provide a control device that controls a transformer according to the loss of the entire load drive system including the transformer and the load.
- a transformer control apparatus boosts or steps down the output voltage of a DC power supply (for example, the DC power supply 101 in the embodiment).
- a control device for example, converter control unit 100C in the embodiment
- a transformer for example, step-up converter 105 in the embodiment
- the switching control unit controlling the switching of the transformer For example, the PWM control unit 223 in the embodiment
- the load power deriving unit for deriving the load power for example, the load power calculating unit 203 in the embodiment
- a transformer loss reduction amount deriving unit for deriving a reduction amount of loss generated in the transformer when the switching control unit intermittently controls the transformer based on a transformation ratio of the transformer
- the switching control unit intermittently controls the transformer based on the load power derived by the load power deriving unit and the transformer ratio of the transformer.
- a voltage variation allowable amount deriving unit for example, a voltage variation allowable amount deriving unit 205 in the embodiment
- the load loss increase amount deriving unit includes the switching control
- an increase amount of loss generated in the load is derived when the output voltage of the transformer pulsates within the voltage fluctuation allowable range.
- a voltage detection unit (for example, the voltage sensor 111 in the embodiment) that detects the output voltage of the transformer is provided, and the transformer is intermittently controlled.
- the switching control unit stops switching control of the transformer, and the amount of change in the output voltage of the transformer detected by the voltage detection unit reaches the voltage variation allowable amount, the switching of the transformer It is characterized by resuming control.
- the switching control unit operates the switching control of the transformer, and the output voltage is applied to the transformer.
- the switching control of the transformer is stopped.
- a time during which the switching control of the transformer by the switching control unit can be stopped is derived according to the load power derived by the load power deriving unit.
- a stoppable time deriving unit (for example, a stoppable time deriving unit in the embodiment) is provided, and during the intermittent control of the transformer, the switching control unit can stop the switching after stopping the switching control of the transformer The switching control of the transformer is restarted after a lapse of time.
- the transformer control device of the invention when the load is in a state where the load consumes power, during the switching control in the intermittent control of the transformer by the switching control unit, The correction is performed to increase the command voltage for the transformer within the range of the allowable voltage fluctuation.
- control device for a transformer of the invention when the load is in a state where the load outputs power, during the switching control in the intermittent control of the transformer by the switching control unit, A correction is performed to reduce the command voltage for the transformer within the range of the voltage fluctuation allowable amount.
- the switching control unit is configured such that a deviation between the output voltage and the corrected command voltage is before and after the correction. When the deviation exceeds the command voltage deviation, the switching control of the transformer is started.
- the switching control unit operates the switching control of the transformer, and the output voltage is the corrected voltage.
- the switching control of the transformer is stopped.
- the transformer loss reduction amount is when the output voltage of the transformer pulsates within the allowable range of voltage fluctuation.
- the switching control unit intermittently controls the transformer when the load loss increase amount is larger. Therefore, the transformer can be intermittently controlled only when the loss of the entire load drive system including the transformer and the load is reduced. That is, the transformer can be controlled according to the loss of the entire load driving system including the transformer and the load.
- the converter 105 when the converter 105 is normally controlled or intermittently controlled, (a) the output voltage V2 of the converter 105, (b) switching control of the transistors constituting the converter 105, and (c) the converter 105 Graph showing reactor current IL flowing through the constituting reactor L, (d) reduction in loss at converter 105, (e) reduction in loss at load
- FIG. 1 is a diagram illustrating a configuration of a load driving system according to an embodiment.
- a boost converter hereinafter simply referred to as “converter”
- inverter 107 boosts output voltage V ⁇ b> 1 of DC power supply 101.
- Inverter 107 converts output voltage V2 of converter 105 into a three-phase (U, V, W) alternating current.
- the electric motor 103 also functions as a generator.
- the inverter 107 and the electric motor 103 are the loads of the converter 105.
- the load driving system includes a voltage sensor 109 that detects the output voltage V1 of the DC power supply 101, a voltage sensor 111 that detects the output voltage V2 of the converter 105, and a direction that is output from the converter 105 and input to the inverter 107. And a current sensor 115 for detecting the load current I2. In addition, a resolver 117 that detects the electrical angle ⁇ of the rotor of the electric motor 103 is provided. Signals indicating values detected by the voltage sensors 109 and 111, the current sensor 115 and the resolver 117 are sent to the control device 100. In addition, command voltage V2c and torque command value T for converter 105 are also input to control device 100 from the outside.
- Control device 100 controls converter 105 and inverter 107, respectively. As shown in FIG. 1, control device 100 includes a control unit (hereinafter referred to as “converter control unit”) 100 ⁇ / b> C of converter 105. Converter control unit 100C performs normal control or intermittent control of converter 105.
- FIG. 2 shows (a) the output voltage V2 of the converter 105 and (b) switching control of the transistors constituting the converter 105 when the converter 105 is normally controlled or intermittently controlled in the load driving system shown in FIG. (1) Reactor current IL flowing through reactor L constituting converter 105, (d) Reduction in loss at converter 105, (e) Reduction in loss at load.
- FIG. 2A in this embodiment, during the intermittent control of the converter 105, the fluctuation range of the output voltage V2 of the converter 105 that rises or falls during the stop period is represented by ⁇ V2.
- converter control unit 100C performs PWM control of converter 105 during a return period during normal control and intermittent control of converter 105.
- FIG. 3 is a block diagram illustrating an internal configuration of the converter control unit 100C included in the control device 100.
- converter control unit 100C includes duty derivation unit 201, load power calculation unit 203, voltage fluctuation allowable amount derivation unit 205, converter loss reduction amount derivation unit 207, and load loss increase amount derivation unit. 209, control stop determination unit 211, power running / regeneration determination unit 213, power running operation / stop determination unit 215, regeneration operation / stop determination unit 217, switch unit 219, and OR circuit (OR circuit) 221 and a PWM control unit 223.
- the converter control unit 100C includes a detected value of the output voltage V1 of the DC power supply 101, a detected value of the output voltage V2 of the converter 105, a command voltage V2c for the converter 105, a detected value of the load current I2, a torque command value T, and
- the rotational angular velocity ⁇ of the rotor of the electric motor 103 is input.
- the rotational angular velocity ⁇ is obtained by time-differentiating the detected value of the electrical angle ⁇ of the rotor of the electric motor 103 detected by the resolver 117.
- Duty derivation unit 201 derives a feed forward duty (Duty_FF) for converter 105 to boost the output voltage V1 to the value indicated by command voltage V2c.
- the duty deriving unit 201 derives a feedback duty (Duty_FB) for correcting the feedforward duty (Duty_FF) based on the deviation ⁇ V2, the output voltage V1 of the DC power supply 101, and the feedforward duty (Duty_FF).
- the duty deriving unit 201 outputs a duty (Duty) obtained by correcting the feedforward duty (Duty_FF) by the feedback duty (Duty_FB).
- the duty (Duty) derived by the duty deriving unit 201 is input to the PWM control unit 223.
- the detected value of the output voltage V2 of the converter 105 and the detected value of the load current I2 are input to the load power calculation unit 203.
- Load power calculation unit 203 outputs a value obtained by multiplying output voltage V2 of converter 105 by load current I2 as load power P.
- the load power P is the power (positive value) supplied to the inverter 107 by the converter 105 or the power (negative value) supplied by the inverter 107 after the power generated by the electric motor 103 is converted and supplied to the converter 105.
- the load power calculation unit 203 corresponds to the supply power to the motor 103 or the output power from the motor 103 obtained based on the torque command value T, the rotational angular velocity ⁇ and the command voltage V2c of the motor 103, and the actual measurement map.
- the output power of converter 105 may be output as load power P.
- the voltage fluctuation allowance deriving unit 205 receives the command voltage V2c, the detected value of the output voltage V1 of the DC power supply 101, and the load power P. Voltage fluctuation allowance deriving unit 205 calculates the ratio of command voltage V2c to output voltage V1, that is, the step-up ratio of converter 105. Further, the voltage fluctuation allowable amount deriving unit 205 uses the map indicating the voltage fluctuation allowable amount ⁇ V corresponding to the load power P and the calculated boost ratio (hereinafter referred to as “ ⁇ V map”) to calculate the load power P and the calculated boost ratio. A voltage variation allowable amount ⁇ V corresponding to is derived. FIG. 4 is a diagram showing a ⁇ V map.
- the allowable voltage fluctuation amount ⁇ V is an allowable fluctuation amount of the output voltage V2 of the converter 105 that rises or falls during the stop period during the intermittent control of the converter 105 by the converter control unit 100C. is there.
- the ⁇ V map shows the amount of loss obtained based on the power output from the converter 105, the step-up ratio, and the amount of change in the loss amount in the converter 105 during the stop period and the return period during intermittent control. The allowable voltage fluctuation amount ⁇ V that can be reduced is shown.
- the converter loss reduction amount deriving unit 207 receives the command voltage V2c, the detected value of the output voltage V1 of the DC power supply 101, and the load power P. Converter loss reduction amount deriving unit 207 calculates the ratio of command voltage V2c to output voltage V1, that is, the boost ratio of converter 105. Further, converter loss reduction amount deriving unit 207 shows a map (hereinafter referred to as “converter loss reduction amount map”) indicating a reduction amount (converter loss reduction amount) of loss generated in converter 105 during intermittent control according to load power P and step-up ratio. The converter loss reduction amount corresponding to the load power P and the calculated boost ratio is derived.
- FIG. 5 is a diagram showing a converter loss reduction map.
- the converter loss reduction amount is a reduction amount of the loss amount generated in the converter 105 during intermittent control, compared with the loss amount generated in the converter 105 during normal control.
- the ⁇ V map shown in FIG. 4 and the converter loss reduction map shown in FIG. 5 are related to each other.
- the load loss increase amount deriving unit 209 receives the voltage variation allowable amount ⁇ V derived by the voltage variation allowable amount deriving unit 205, the command voltage V2c, the torque command value T, and the rotational angular velocity ⁇ of the rotor of the electric motor 103.
- Load loss increase amount deriving unit 209 derives an increase in load loss (load loss increase amount) when output voltage V2 of converter 105 pulsates with a width of ⁇ V during intermittent control.
- FIG. 6A is a map showing the magnitude of the loss (load loss amount) generated in the load when the converter 105 outputs the command voltage V2c corresponding to the rotation speed and torque of the electric motor 103.
- FIG. 6B shows the magnitude of loss (load loss amount) generated in the load when converter 105 outputs “command voltage V2c- ⁇ ” corresponding to the rotation speed and torque of electric motor 103. It is a map.
- the load loss increase amount deriving unit 209 derives the load loss amounts A and B from the maps of FIGS. 6A and 6B based on the torque command value T and the rotational angular velocity ⁇ . 7 shows the relationship between the load loss amount A obtained from FIG. 6A and the load loss amount B obtained from FIG. 6B, the command voltage V2c and “command voltage V2c ⁇ ”, and the converter 105.
- FIG. 6 is a diagram illustrating an increase in load loss that occurs in a load when “V2c ⁇ V” is output.
- the control stop determination unit 211 compares the converter loss reduction amount derived by the converter loss reduction amount deriving unit 207 with the load loss increase amount derived by the load loss increase amount deriving unit 209.
- the control stop determination unit 211 outputs an operation instruction signal “1” when the converter loss reduction amount is equal to or less than the load loss increase amount, and outputs a stop instruction signal “0” when the converter loss reduction amount is larger than the load loss increase amount. Output.
- the signal is input to an OR circuit (OR circuit) 221.
- the load power P calculated by the load power calculation unit 203 is input to the power running / regeneration determination unit 213.
- the power running / regeneration determination unit 213 determines whether the electric motor 103 is in a power running operation or a regenerative operation. That is, the power running / regeneration determination unit 213 determines that the motor 103 is in a power running operation when the load power P is a positive value, and determines that the motor 103 is in a regenerative operation when the load power P is a negative value.
- the power running / regeneration determination unit 213 sends a selection signal indicating the determination result to the switch unit 219.
- the power running operation / stop determination unit 215 outputs an operation instruction signal “1” when it is determined as an operation, and outputs a stop instruction signal “0” when it is determined as a stop.
- the regeneration operation / stop determination unit 217 Based on the deviation ⁇ V2 and the voltage fluctuation allowable amount ⁇ V, the regeneration operation / stop determination unit 217 performs PWM control of the converter 105 based on the hysteresis shown in the block of the regeneration operation / stop determination unit 217 in FIG. It is determined whether to perform (operation) or not (stop).
- the regeneration operation / stop determination unit 217 outputs an operation instruction signal “1” when it is determined as an operation, and outputs a stop instruction signal “0” when it is determined as a stop.
- converter control unit 100C may obtain the time (stoppable time) until deviation ⁇ V2 reaches voltage variation allowable amount ⁇ V from the graph shown in FIG.
- FIG. 8 is a graph showing the relationship between the load power P and the stoppable time when the electric motor 103 is in the power running operation and the regenerative operation, corresponding to the predetermined voltage fluctuation allowable amount ⁇ V.
- converter control unit 100C includes a stoppable time deriving unit (not shown) for deriving a stoppable time corresponding to load power P derived by load power calculation unit 203.
- the power running operation / stop determination unit 215 and the regeneration operation / stop determination unit 217 stop the PWM control of the converter 105 and, after the stoppable time elapses, the operation instruction signal “1” to restart the PWM control of the converter 105. Is output.
- the switch unit 219 outputs one of the signal from the powering operation / stop determination unit 215 and the signal from the regeneration operation / stop determination unit 217 according to the selection signal output from the powering / regeneration determination unit 213. To do. A signal output from the switch unit 219 is input to an OR circuit (OR circuit) 221.
- An OR circuit (OR circuit) 221 performs an OR operation on the signal (1 or 0) input from the switch unit 219 and the signal (1 or 0) input from the control stop determination unit 211, and the operation result is obtained.
- the indicated signal (1 or 0) is output.
- the logical sum circuit 221 has the stop instruction signal “0” as the signal from the power running operation / stop determination unit 215 or the regeneration operation / stop determination unit 217 selected by the switch unit 219, and the control stop determination.
- the signal “0” is output only when the unit 211 outputs the stop instruction signal “0”.
- the signal output from the OR circuit 221 is input to the PWM control unit 223.
- the PWM control unit 223 receives the duty (Duty) derived by the duty deriving unit 201, the signal output from the OR circuit 221 and 0% duty.
- the PWM control unit 223 performs PWM control on the converter 105 according to the signal input from the OR circuit 221.
- the PWM control unit 223 performs PWM control of the converter 105 with the duty (Duty) from the duty derivation unit 201, and the signal from the OR circuit 221 is “0”. At this time, the PWM control of the converter 105 is not performed.
- FIG. 9 is a flowchart showing the operation of the converter control unit 100C.
- the load power calculation unit 203 calculates the load power P (step S101).
- the voltage variation allowable amount deriving unit 205 derives the voltage variation allowable amount ⁇ V corresponding to the load power P and the boost ratio using the ⁇ V map shown in FIG. 4 (step S103).
- the converter loss reduction amount deriving unit 207 derives the converter loss reduction amount corresponding to the load power P and the step-up ratio using the converter loss reduction amount map shown in FIG. 5 (step S105).
- the load loss increase amount deriving unit 209 calculates the load loss increase amount using the map shown in FIG. 6A or 6B and the above-described calculation formula (step S107).
- the control stop determination unit 211 compares the converter loss reduction amount with the load loss increase amount (step S109). When the converter loss reduction amount is equal to or less than the load loss increase amount, the control stop determination unit 211 proceeds to step S111. When larger than the increase amount, the process proceeds to step S113.
- step S111 converter control unit 100C performs PWM control of converter 105. Note that the PWM control performed in step S111 corresponds to the normal control shown in FIG.
- the power running / regeneration determination unit 213 determines whether the electric motor 103 is in a power running operation or a regenerative operation based on the sign of the load power P.
- the power running / regeneration determination unit 213 determines that the electric motor 103 is in the power running operation when the load power P is greater than 0 and proceeds to step S115, and determines that the motor 103 is in the regenerative operation when the load power P is 0 or less. Proceed to step S125.
- step S117 converter control unit 100C performs PWM control of converter 105. Note that the period during which PWM control is performed in step S117 corresponds to the return period during intermittent control shown in FIG.
- ⁇ V2 ⁇ the process proceeds to step S121, and when ⁇ V2 ⁇ 0.
- step S123 it is determined whether PWM control of converter 105 by converter control unit 100C is stopped. If it is stopped, the process proceeds to step S123, and if not stopped, the process proceeds to step S117.
- step S123 converter control unit 100C does not perform PWM control of converter 105. Note that the period in which the PWM control is not performed in step S123 corresponds to a stop period in which the electric motor 103 illustrated in FIG.
- the process proceeds to step S117.
- the process proceeds to step S127.
- step S129 it is determined whether PWM control of converter 105 by converter control unit 100C is stopped. If it is stopped, the process proceeds to step S131, and if not stopped, the process proceeds to step S117.
- step S131 converter control unit 100C does not perform PWM control of converter 105. Note that the period in which PWM control is not performed in step S131 corresponds to a stop period during which intermittent control is performed when the electric motor 103 shown in FIG. 2 is regenerated.
- the loss reduction amount (converter loss reduction amount) in the converter 105 when the converter 105 is intermittently controlled is such that the output voltage V2 of the converter 105 is voltage fluctuation allowable.
- the converter control unit 100C intermittently controls the converter 105 when it is larger than the loss increase amount (load loss increase amount) at the load. Therefore, the converter 105 can be intermittently controlled only when the loss of the entire load drive system including the converter 105 and the load is reduced.
- converter control unit 100C controls the stop period so that the fluctuation range of output voltage V2 of converter 105 is equal to voltage fluctuation allowable amount ⁇ V.
- the ⁇ V map used in deriving the voltage fluctuation allowable amount ⁇ V is related to the converter loss reduction amount map. Therefore, the allowable voltage fluctuation amount deriving unit derives the allowable voltage fluctuation amount ⁇ V that maximizes the converter loss reduction amount when the converter 105 is intermittently controlled.
- the converter loss reduction amount at the time of intermittently controlling the converter 105 can be set to the maximum, the opportunity for the intermittent control of the converter 105 can be increased.
- FIG. 2 used in the description of the above embodiment shows a case where the command voltage V2c is constant, the command voltage V2c may be increased or decreased according to the state of the motor 103.
- FIG. 10 shows (a) the output voltage V2 of the converter 105 when the command voltage V2c is increased or decreased during the intermittent control of the converter 105, (b) the switching control of the transistors constituting the converter 105, and (c) the converter 105.
- 3 is a graph showing a reactor current IL flowing through a reactor L. As shown in FIG. 10, if electric motor 103 is in a power running operation, converter control unit 100C may perform correction to increase command voltage V2c from that in normal control within a range within voltage fluctuation allowable amount ⁇ V.
- the power running operation / stop determination unit 215 executes the PWM control of the converter 105 until the output voltage V2 of the converter 105 reaches the corrected command voltage V2c during the intermittent control, and after that, the PWM control is performed. To stop.
- the command voltage V2c is corrected in this way, as shown in FIG. 10, even if the output voltage V2 of the converter 105 decreases during the stop period during intermittent control, the output voltage V2 is higher than that during normal control. .
- the loss in the load may be suppressed when the output voltage V2 of the converter 105, that is, the input voltage of the electric motor 103 is higher.
- the voltage fluctuation allowance ⁇ V the lower the output voltage V2, the lower the loss.
- the converter control unit 100C may perform correction to lower the command voltage V2c from that in the normal control within a range within the voltage fluctuation allowable amount ⁇ V.
- the regenerative operation / stop determination unit 217 executes the PWM control of the converter 105 until the output voltage V2 of the converter 105 reaches the corrected command voltage V2c during the intermittent control, and after that reaches the PWM control. To stop.
- the intermittent control is provided with a return period (switching control) after the stop period of the switching control.
- the return period switching control
- the return period switching control
- the boost converter 105 has been described as an example.
- the step-up / down converter 505 or the step-down converter illustrated in FIG. 11 may be used.
- the allowable voltage fluctuation amount deriving unit 205 derives the allowable voltage fluctuation amount ⁇ V using the ⁇ V map, but the allowable voltage fluctuation amount ⁇ V may be a fixed value.
- Control apparatus 100C Converter control part 101 DC power supply 103 Electric motor 105 Boost converter 107 Inverter 109,111 Voltage sensor 115 Current sensor 117 Resolver 201 Duty derivation part 203 Load power calculation part 205 Voltage fluctuation allowance derivation part 207 Converter loss reduction amount derivation part 209 Load loss increase amount deriving unit 211 Control stop determining unit 213 Power running / regeneration determining unit 215 Power running operation / stop determining unit 217 Regeneration operation / stop determining unit 219 Switch unit 221 OR circuit (OR circuit) 223 PWM controller
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Abstract
Description
負荷損失増加量={(A-B)×ΔV}/α
負荷損失増加量={(A-B)×ΔV/2}/α
100C コンバータ制御部
101 直流電源
103 電動機
105 昇圧コンバータ
107 インバータ
109,111 電圧センサ
115 電流センサ
117 レゾルバ
201 デューティ導出部
203 負荷電力算出部
205 電圧変動許容量導出部
207 コンバータ損失低減量導出部
209 負荷損失増加量導出部
211 制御停止判断部
213 力行・回生判断部
215 力行時動作・停止判断部
217 回生時動作・停止判断部
219 スイッチ部
221 論理和回路(OR回路)
223 PWM制御部
Claims (9)
- 直流電源の出力電圧を昇圧又は降圧して負荷に印加する変圧器の制御装置であって、
前記変圧器をスイッチング制御するスイッチング制御部と、
負荷電力を導出する負荷電力導出部と、
前記負荷電力導出部が導出した負荷電力及び前記変圧器の変圧比に基づいて、前記スイッチング制御部が前記変圧器を間欠制御した際に前記変圧器で発生する損失の低減量を導出する変圧器損失低減量導出部と、
前記スイッチング制御部が前記変圧器を間欠制御した際に前記負荷で発生する損失の増加量を導出する負荷損失増加量導出部と、
前記変圧器損失低減量導出部によって導出された変圧器損失低減量が前記負荷損失増加量導出部によって導出された負荷損失増加量より大きいとき、前記スイッチング制御部が前記変圧器を間欠制御するよう指示する制御指示部と、
を備えたことを特徴とする変圧器の制御装置。 - 請求項1に記載の変圧器の制御装置であって、
前記負荷電力導出部が導出した負荷電力及び前記変圧器の変圧比に基づいて、前記スイッチング制御部が前記変圧器を間欠制御する際の前記変圧器の電圧変動許容量を導出する電圧変動許容量導出部を備え、
前記負荷損失増加量導出部は、前記スイッチング制御部が前記変圧器を間欠制御時、前記変圧器の出力電圧が前記電圧変動許容量の幅で脈動したときに前記負荷で発生する損失の増加量を導出することを特徴とする変圧器の制御装置。 - 請求項2に記載の変圧器の制御装置であって、
前記変圧器の出力電圧を検出する電圧検出部を備え、
前記変圧器の間欠制御時、前記スイッチング制御部は、前記変圧器のスイッチング制御を停止中に、前記電圧検出部が検出した前記変圧器の出力電圧の変化量が前記電圧変動許容量に到達すると、前記変圧器のスイッチング制御を再開することを特徴とする変圧器の制御装置。 - 請求項3に記載の変圧器の制御装置であって、
前記変圧器の間欠制御時、前記スイッチング制御部は、前記変圧器のスイッチング制御を動作中に、前記出力電圧が前記変圧器に対する指令電圧に到達すると、前記変圧器のスイッチング制御を停止することを特徴とする変圧器の制御装置。 - 請求項2に記載の変圧器の制御装置であって、
前記負荷電力導出部が導出した負荷電力に応じた、前記スイッチング制御部による前記変圧器のスイッチング制御を停止可能な時間を導出する停止可能時間導出部を備え、
前記変圧器の間欠制御時、前記スイッチング制御部は、前記変圧器のスイッチング制御を停止してから前記停止可能時間経過後に、前記変圧器のスイッチング制御を再開することを特徴とする変圧器の制御装置。 - 請求項2に記載の変圧器の制御装置であって、
当該制御装置は、前記負荷が電力を消費する状態のとき、前記スイッチング制御部による前記変圧器の間欠制御におけるスイッチング制御中に、前記変圧器に対する指令電圧を前記電圧変動許容量の範囲で上げる補正を行うことを特徴とする変圧器の制御装置。 - 請求項2に記載の変圧器の制御装置であって、
当該制御装置は、前記負荷が電力を出力する状態のとき、前記スイッチング制御部による前記変圧器の間欠制御におけるスイッチング制御中に、前記変圧器に対する指令電圧を前記電圧変動許容量の範囲で下げる補正を行うことを特徴とする変圧器の制御装置。 - 請求項6又は7に記載の変圧器の制御装置であって、
前記変圧器の間欠制御時、前記スイッチング制御部は、前記出力電圧と前記補正後の指令電圧の偏差が、補正前と補正後の指令電圧の偏差以上になると、前記変圧器のスイッチング制御を開始することを特徴とする変圧器の制御装置。 - 請求項8に記載の変圧器の制御装置であって、
前記変圧器の間欠制御時、前記スイッチング制御部は、前記変圧器のスイッチング制御を動作中に、前記出力電圧が前記補正後の指令電圧に到達すると、前記変圧器のスイッチング制御を停止することを特徴とする変圧器の制御装置。
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