WO2017022083A1 - 同期電動機制御装置、圧縮機駆動装置、空気調和機及び同期電動機の制御方法 - Google Patents
同期電動機制御装置、圧縮機駆動装置、空気調和機及び同期電動機の制御方法 Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/32—Cooling devices
- B60H1/3204—Cooling devices using compression
- B60H1/3222—Cooling devices using compression characterised by the compressor driving arrangements, e.g. clutches, transmissions or multiple drives
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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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- 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
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
-
- 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
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/0003—Control strategies in general, e.g. linear type, e.g. P, PI, PID, using robust control
- H02P21/0021—Control strategies in general, e.g. linear type, e.g. P, PI, PID, using robust control using different modes of control depending on a parameter, e.g. the speed
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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
- 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
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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
- 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
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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
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/021—Inverters therefor
-
- 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
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/025—Compressor control by controlling speed
- F25B2600/0253—Compressor control by controlling speed with variable speed
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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
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/24—Vector control not involving the use of rotor position or rotor speed sensors
- H02P21/26—Rotor flux based control
-
- 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
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/34—Arrangements for starting
Definitions
- the present invention relates to a synchronous motor control device, a compressor driving device, an air conditioner, and a synchronous motor control method for detecting and controlling a current flowing through the synchronous motor.
- Patent Document 1 as an example of a conventional synchronous motor control device, current detection means for detecting a current flowing to a synchronous motor, and coordinate conversion of the current detected by the synchronous motor to a ⁇ - ⁇ axis assumed on a rotor Current coordinate conversion means, correction term calculation means for calculating a correction term based on the correction current command and the coordinate-converted current, and a ⁇ - ⁇ axis voltage based on a voltage equation and a correction term in the steady state of the synchronous motor.
- a synchronous motor control device that includes a voltage command calculation means that calculates a command, and that causes a DC current to flow in accordance with a detected magnetic pole position and estimates a primary resistance of the synchronous motor during startup.
- the calculation load can be reduced by calculating the voltage command value using the voltage equation, and the synchronous motor mounted on the compressor can be estimated by estimating the primary resistance of the synchronous motor at the start.
- the synchronous motor mounted on the compressor can be estimated by estimating the primary resistance of the synchronous motor at the start.
- the current control means for adjusting the magnitude of the phase current of the synchronous motor is provided only during the resistance value estimation period. Therefore, when PWM control is performed, activation is caused by at least one of the influence of switching variation of the switching element performing PWM control and the influence of variation in detection of DC voltage when driving by converting DC to three-phase AC. There is a problem in that it may not be possible to start when the torque required at times is large.
- the present invention has been made in view of the above, and an object thereof is to obtain a synchronous motor control device that can be stably started.
- a synchronous motor control device includes an inverter main circuit, a synchronous motor driven by converting direct current of a direct current power source into alternating current by the inverter main circuit, And an inverter control unit that receives the angular velocity command value, the phase current value of the synchronous motor, and the DC voltage value of the DC power supply and outputs a PWM signal for controlling the inverter main circuit.
- the inverter control unit includes a PWM signal generation unit, a start-up control unit that outputs a start-up voltage command value corresponding to the phase current value to the PWM signal generation unit at the start-up, and a steady-state operation using a voltage equation during normal operation.
- Steady control that calculates the voltage command value and outputs it to the PWM signal generator and steady control so that the output voltage vector from the inverter main circuit to the synchronous motor matches before and after switching when switching from startup to steady state
- a steady control parameter initial value calculation unit that outputs the control parameter initial value of the unit to the steady control unit.
- the synchronous motor control device according to the present invention has an effect that stable starting is possible.
- FIG. 1 is a block diagram showing a configuration of a synchronous motor control device according to a first embodiment.
- Timing chart from start-up to steady-state in Embodiment 1 The figure which shows an output voltage vector and an electric current vector in Embodiment 1 when it corresponds in the time of starting and a steady time
- the block diagram which shows the structure of the synchronous motor control apparatus which concerns on Embodiment 2.
- FIG. Timing chart from start-up to steady-state in Embodiment 2 The flowchart which shows operation
- FIG. 1 is a block diagram showing a configuration of a synchronous motor control device according to Embodiment 1 of the present invention.
- the synchronous motor control device according to the first embodiment is connected to a DC power source 1 and is composed of an inverter main circuit 2 composed of a plurality of switching elements, and AC power output from the inverter main circuit 2.
- FIG. 1 A three-phase synchronous motor 3 to be driven, current detectors 4a and 4b for detecting a phase current value of the three-phase synchronous motor 3, a voltage detector 5 for detecting a DC voltage value of the DC power source 1, an angular velocity command value, A phase current value detected by the current detectors 4a and 4b and a DC voltage value detected by the voltage detector 5 are input to generate a PWM signal for controlling on / off of a
- an inverter main circuit 2 to which a DC power source 1 is connected includes power switching elements SW1, SW2, SW3, SW4, SW5, SW6 and power switching elements SW1, SW2, SW3, SW4, SW5, SW6.
- the diodes D1, D2, D3, D4, D5, and D6 connected in reverse parallel and a drive circuit (not shown) for the power switching elements SW1, SW2, SW3, SW4, SW5, and SW6 are provided. It converts into alternating current and drives the three-phase synchronous motor 3.
- the inverter main circuit 2 is configured by an IPM (Intelligent Power Module).
- the three-phase synchronous motor 3 includes a three-phase Y-shaped stator 3a composed of a U phase, a V phase, and a W phase, and a permanent magnet rotor 3b.
- the power switching elements SW1, SW2, SW3, SW4, SW5, and SW6 are IGBTs (Insulated Gate Bipolar Transistors), but the present invention is not limited to this.
- the DC power supply 1 may be generated by rectifying and smoothing an AC power supply as an example.
- the three-phase synchronous motor is illustrated here as a synchronous motor, this invention is not limited to this.
- the current detector 4a detects the U-phase current Iu flowing through the three-phase synchronous motor 3, and the current detector 4b detects the W-phase current Iw flowing through the three-phase synchronous motor 3.
- the voltage detector 5 detects the voltage of the DC power supply 1.
- the U-phase current and the W-phase current are detected.
- the present invention is not limited to this, and the U-phase current Iu and the V-phase current Iv may be detected.
- V phase current Iv and W phase current Iw may be detected, or all three phase currents may be detected.
- the current flowing through the DC power supply 1 may be detected to detect a two-phase current.
- the current detecting means for detecting the current flowing through the DC bus of the inverter main circuit and the current detecting means Switching means corresponding to any of the basic voltage vectors other than the zero vector, based on the switching mode of the inverter main circuit in FIG.
- the mode holding time is configured to be longer than the sum of the dead time of the inverter main circuit and the time required for current detection by the current detection means.
- the inverter control unit 6 includes an angular velocity command value ⁇ * input from the outside, a U-phase current Iu detected by the current detector 4a, a W-phase current Iw detected by the current detector 4b, and a voltage detector 5 Is used to generate and output a PWM signal for driving the power switching elements SW1, SW2, SW3, SW4, SW5, SW6 of the inverter main circuit 2.
- the inverter control unit 6 can be realized by a microprocessor.
- the inverter control unit 6 operates in the “startup control mode” or the “steady control mode”, and operates in the “startup control mode” when the inverter control starts.
- “at startup” is an operation in “startup control mode”
- “steady time” is an operation in “steady control mode”.
- “At the time of start-up” is also described as “at the time of start-up control”
- “at the time of steady-state” is also described as “at the time of steady-state control”.
- the switches 18, 19, and 20 are all connected to the a terminal side, and during normal operation, the switches 18, 19, and 20 are all connected to the b terminal side.
- the startup control unit 8 and the steady control parameter initial value calculation unit 12 operate only at startup. First, a case where the inverter control unit 6 operates in the “startup control mode” will be described.
- the current coordinate conversion unit 7 inputs a U-phase current Iu and a W-phase current Iw based on a phase ⁇ , which will be described later, and converts them into values on the ⁇ - ⁇ axis that is the control axis of the rotating coordinate system.
- the shaft current I ⁇ and the ⁇ -axis current I ⁇ are output.
- a control axis in startup control that is controlled based on a voltage command value output from the startup control unit 8 to be described later is defined as a “ ⁇ _K ⁇ _K axis”, and a voltage command output from the steady control unit 13 to be described later.
- control axis in steady control that is controlled based on the value is defined as “ ⁇ _T ⁇ _T axis”
- the phase ⁇ is corrected when shifting from start-up control to steady control as will be described later.
- I ⁇ and ⁇ -axis current I ⁇ a value in “ ⁇ _K ⁇ _K axis” is output during start-up control, and a value in “ ⁇ _T- ⁇ _T axis” is output during steady-state control.
- the start control unit 8 that performs current control includes a start-up ⁇ -axis current command value I ⁇ _K * and a start-up ⁇ -axis current command value I ⁇ _K * in which the ⁇ -axis current I ⁇ and the ⁇ -axis current I ⁇ are given in advance for start-up control, respectively. So that the starting ⁇ -axis voltage command value V ⁇ _K * and the starting ⁇ -axis voltage command value V ⁇ _K * are calculated and output.
- the voltage coordinate conversion unit 9 receives the ⁇ -axis voltage command value V ⁇ *, the ⁇ -axis voltage command value V ⁇ *, and the phase ⁇ , and inputs the ⁇ -axis voltage command value V ⁇ * and the ⁇ -axis voltage command value V ⁇ * based on the phase ⁇ . It is converted into a three-phase voltage command value Vu *, Vv *, Vw * and output.
- the PWM signal generation unit 10 receives the three-phase voltage command values Vu *, Vv *, Vw * and the DC voltage Vdc as input, and drives PWM for driving the power switching elements SW1, SW2, SW3, SW4, SW5, SW6. Generate and output a signal.
- the integrator 11 receives the primary angular velocity ⁇ 1 and integrates the primary angular velocity ⁇ 1 to output a phase ⁇ .
- the phase ⁇ is input to the current coordinate conversion unit 7 and the voltage coordinate conversion unit 9.
- ⁇ 1 ⁇ *.
- the steady-state control parameter initial value calculation unit 12 corrects the control parameters of the steady-state control unit 13 to be described later so that the output voltage vectors when shifting from the “start-up control mode” to the “steady-state control mode” match before and after the transition.
- the initial value of the current command value Ix * is calculated and output.
- the steady control parameter initial value calculation unit 12 includes a startup ⁇ -axis voltage command value V ⁇ _K * and a startup ⁇ -axis voltage command value V ⁇ _K * output from the startup control unit 8, and a steady-time ⁇ output from the steady control unit 13.
- the axis voltage command value V ⁇ _T *, steady-state ⁇ -axis voltage command value V ⁇ _T *, and the startup ⁇ -axis current command target value I ⁇ _K ** given in advance for start-up control are input, and “ ⁇ _T- ⁇ _T axis”
- the ⁇ -axis current I ⁇ ′ and ⁇ -axis current I ⁇ ′ are calculated and output, and the startup correction current command value Ix_K * used in the “startup control mode” is calculated and output.
- I ⁇ _T I ⁇
- I ⁇ _T I ⁇
- I ⁇ _T and I ⁇ _T are a ⁇ -axis current and a ⁇ -axis current respectively used by the steady control unit 13.
- the steady control unit 13 calculates and outputs the steady-state ⁇ -axis voltage command value V ⁇ _T * and the steady-state ⁇ -axis voltage command value V ⁇ _T *.
- the steady-state ⁇ -axis voltage command value V ⁇ _T * and the steady-state ⁇ -axis voltage command value V ⁇ _T * are calculated by the voltage equation shown in the following equation (1). This voltage equation is obtained by multiplying the correction term Icmp by a gain to the voltage equation in the steady state of the three-phase synchronous motor 3 and adding it.
- phase resistance Ra the d-axis inductance Ld, the q-axis inductance Lq, and the induced voltage constant ⁇ f are motor parameters
- K ⁇ , K ⁇ , and Kcmp are gains that are set.
- the gain is divided into values for start-up control and steady-state control, and a switchable configuration is adopted. It may be necessary.
- the frequency compensation amount calculation unit 14 receives the ⁇ -axis current I ⁇ as an input, and calculates and outputs the angular velocity compensation amount ⁇ d.
- the subtracter 15 receives the angular velocity command value ⁇ * and the angular velocity compensation amount ⁇ d as inputs, subtracts the angular velocity compensation amount ⁇ d from the angular velocity command value ⁇ *, and outputs the result.
- the switch 18 is connected to the b terminal, so that the output of the subtractor 15 is selected as the primary angular velocity ⁇ 1.
- the correction current command value output unit 16 receives the ⁇ -axis current I ⁇ and outputs a steady-state correction current command value Ix_T * used in the “steady control mode”. As an example, the correction current command value output unit 16 stores in advance a steady-state correction current command value Ix_T * for the ⁇ -axis current I ⁇ as a data table, and the correction current command value output unit 16 refers to this data table, A steady-state correction current command value Ix_T * for the input ⁇ -axis current I ⁇ is output.
- the filter 17 receives the steady-state correction current command value Ix_T * and the startup correction current command value Ix_K *, and outputs a value Ix_T * ′ obtained by applying a first-order lag filter to the output of the correction current command value output unit 16.
- the startup correction current command value Ix_K * calculated by the steady control parameter initial value calculation unit 12 is used as the initial value of the value Ix_T * ′ that is the output of the filter 17.
- FIG. 2 is a timing chart from the starting time to the steady time in the first embodiment. 2, (a) shows whether the terminal positions of the switches 18, 19, and 20 are on the a terminal side or the b terminal side, and (b) shows the start time ⁇ input to the start control unit 8.
- the shaft current command value I ⁇ _K *, the startup ⁇ -axis current command value I ⁇ _K *, and the corrected current command value Ix * input to the steady control unit 13 are shown, and (c) shows the angular velocity command value ⁇ *.
- start-up control mode from the start of starting the driving of the three-phase synchronous motor 3 to the time t2, all switches 18, 19, and 20 are connected to the a terminal side, and the start time output from the start control unit 8
- Start-up control is performed using the ⁇ -axis voltage command value V ⁇ _K * and the start-up ⁇ -axis voltage command value V ⁇ _K *, and in the “steady control mode” after time t2, all the switches 18, 19, 20 are connected to the b terminal side.
- steady control is performed using the steady-state ⁇ -axis voltage command value V ⁇ _T * and the steady-state ⁇ -axis voltage command value V ⁇ _T * output from the steady control unit 13.
- the startup ⁇ -axis current command value I ⁇ _K * input to the startup control unit 8 approaches the startup ⁇ -axis current command target value I ⁇ _K ** from 0 [A], for example, with a first order delay of a filter time constant of 100 ms. Is set.
- the starting ⁇ -axis current command target value I ⁇ _K ** is set to a value that allows a phase current that can reliably ensure the starting torque required for the three-phase synchronous motor 3 to flow.
- the starting ⁇ -axis current command value I ⁇ _K * is fixed to 0 [A]. At this time, the effective value of the phase current of the three-phase synchronous motor 3 is controlled so as to converge to “I ⁇ _K * / ⁇ 3”.
- the angular velocity command value ⁇ * is 0 [rad / s] from the start of startup until the startup ⁇ -axis current command value I ⁇ _K * converges to the startup ⁇ -axis current command target value I ⁇ _K **.
- the acceleration is performed until the time t2 at an acceleration rate dedicated to the “startup control mode” that is later than in the “steady control mode”.
- the start control is started without estimating the magnetic pole position of the permanent magnet rotor 3b at the time of stop.
- the magnetic pole position is set. It is better to start activation control after estimation.
- the “ ⁇ _K- ⁇ _K axis” and the “ ⁇ _T- ⁇ _T axis” do not coincide with each other, and an axis error ⁇ v occurs.
- Va_K Va_T
- the axial error ⁇ v is a steady-state voltage phase ⁇ v_T that is an angle formed between the steady-state ⁇ -axis voltage command value V ⁇ _T * and the steady-state ⁇ -axis voltage command value V ⁇ _T *, and the startup ⁇ -axis. It can be expressed as a difference between the startup voltage phase ⁇ v_K that is an angle formed by the voltage command value V ⁇ _K * and the startup ⁇ -axis voltage command value V ⁇ _K *.
- FIG. 4 is a flowchart showing the operation of the steady control parameter initial value calculation unit 12 in the first embodiment.
- the processing of the flowchart shown in FIG. 4 is repeated for the period from time t1 to time t2, for each control cycle of the inverter control unit 6, for example, for each carrier cycle of the PWM signal.
- the process is started, and the magnitude of the output voltage vector at startup
- the steady-state voltage phase ⁇ v_T is calculated using the steady-state ⁇ -axis voltage command value V ⁇ _T * and the steady-state ⁇ -axis voltage command value V ⁇ _T * calculated in S3 (S4). Thereafter, the difference between the steady-state voltage phase ⁇ v_T calculated in S4 and the startup voltage phase ⁇ v_K calculated in S1 is calculated, and this is set as the initial value of the axis error ⁇ v (S5).
- the axis error ⁇ v is “ ⁇ v_T ⁇ v_K”, which is the difference between the steady-time voltage phase ⁇ v_T and the startup voltage phase ⁇ v_K.
- the adjustment phase ⁇ v_adj is adjusted so as to approach by 0.1 deg.
- the ⁇ -axis current I ⁇ ′ and the ⁇ -axis current I ⁇ ′ on the “ ⁇ _T ⁇ _T axis” are calculated based on the axis error ⁇ v obtained in S5 or S6 (S7).
- the ⁇ -axis current I ⁇ and the ⁇ -axis current I ⁇ which are the outputs of the current coordinate conversion unit 7, converge to the startup ⁇ -axis current command value I ⁇ _K * and the startup ⁇ -axis current command value I ⁇ _K *, respectively.
- the steady-state ⁇ -axis current I ⁇ _T and the steady-state ⁇ -axis current I ⁇ _T are calculated using the magnitude of the current vector
- I ⁇ _T I ⁇ ′
- I ⁇ _T I ⁇ ′
- the corrected current command value Ix * is calculated using the equation (2), and this value is set as the initial value of the startup corrected current command value Ix_K * (S9). If this flow process is not the first time (S8: No), that is, if it is the second time or later, the magnitude
- Is corrected by PI control of the proportional gain Kp_va so that the startup correction current command value Ix_K * is calculated (S10). Since this process is performed during the period from time t1 to time t2, Ix * Ix_K *.
- the steady-state ⁇ -axis current I ⁇ _T and steady-state ⁇ -axis current I ⁇ _T calculated in S7 and the corrected current command value Ix * calculated in S9 or S10 are substituted into the above formulas (1) and (2),
- the constant ⁇ -axis voltage command value V ⁇ _T * and the steady-state ⁇ -axis voltage command value V ⁇ _T * are calculated (S11).
- and the steady-state voltage phase ⁇ v_T are calculated using the steady-state ⁇ -axis voltage command value V ⁇ _T * and the steady-state ⁇ -axis voltage command value V ⁇ _T * calculated in S11.
- the startup output voltage vector Va_K and the steady output voltage vector Va_T coincide with each other, and the switches 18, 19, and 20 are moved from the a terminal side to the b terminal side.
- the startup correction current command value Ix_K * is set as the initial value of the value Ix_T * ′ that is the output of the filter 17 and the phase ⁇ that is the output of the integrator 11 is corrected by the axial error ⁇ .
- the mode can be shifted without fluctuation of the output voltage vector Va.
- the start-up setting is easy and can be realized with a small calculation amount.
- the start-up setting is easy and can be realized with a small calculation amount.
- it is possible to flow a phase current that can ensure the necessary starting torque at the time of starting it is also applied to a load of a three-phase synchronous motor that requires a large torque at the time of starting depending on the state of the refrigerant such as a compressor Is possible.
- the control parameter initial value for steady control so that the output voltage vector at startup matches the output voltage vector at steady state, the magnitude and phase of the steady state output voltage vector are repeatedly calculated for each control cycle.
- the steady-state output voltage vector can be converged to the startup output voltage vector.
- mode switching from start-up control to steady control can be performed during acceleration without making the rotation speed of the three-phase synchronous motor constant, so that the influence of resonance points that can occur in the low-speed range is minimized. Can do.
- Embodiment 2 calculates the voltage command value by multiplying the voltage equation in the steady state of the three-phase synchronous motor 3 by multiplying the correction term Icmp by the gain, and calculating the voltage command value.
- the second embodiment a mode in which primary magnetic flux control is used for the steady control unit will be described.
- FIG. 5 is a block diagram showing the configuration of the synchronous motor control device according to the second embodiment of the present invention.
- the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.
- the steady control parameter initial value calculation unit 12a, the steady control unit 13a, the primary magnetic flux command value output unit 16a, the filter 17a, and the switch 19a in the inverter control unit 6a having a configuration different from that of the first embodiment will be described. explain.
- the steady-state control parameter initial value calculation unit 12a is a primary parameter that is a control parameter of the steady-state control unit 13a described later so that the output voltage vectors at the time of transition from the “startup control mode” to the “steady-state control mode” match before and after the transition.
- the initial value of the primary magnetic flux command value ⁇ * in the magnetic flux control is calculated and output.
- the steady control parameter initial value calculation unit 12a includes a startup ⁇ -axis voltage command value V ⁇ _K * and a startup ⁇ -axis voltage command value V ⁇ _K * output from the startup control unit 8, and a steady-time ⁇ output from the steady control unit 13a.
- the axis voltage command value V ⁇ _T *, the steady-state ⁇ -axis voltage command value V ⁇ _T *, and the startup ⁇ -axis current command target value I ⁇ _K ** given in advance for startup control are input, and the “ ⁇ _T- ⁇ _T axis”
- the ⁇ -axis current I ⁇ ′ and ⁇ -axis current I ⁇ ′ are calculated and output, and the startup primary magnetic flux command value ⁇ _K * used in the “startup control mode” is calculated and output.
- the steady control unit 13a performs primary magnetic flux control, calculates and outputs a steady state ⁇ -axis voltage command value V ⁇ _T * and a steady state ⁇ -axis voltage command value V ⁇ _T *.
- the steady-state ⁇ -axis voltage command value V ⁇ _T * and the steady-state ⁇ -axis voltage command value V ⁇ _T * are calculated based on the voltage equation shown in the following equation (3) by primary magnetic flux control.
- phase resistance Ra the d-axis inductance Ld, the q-axis inductance Lq, and the induced voltage constant ⁇ f are motor parameters
- K ⁇ ′ and K ⁇ ′ are gains to be set.
- the gain is too large, control cannot be performed so that the output voltage vectors at startup and steady-state coincide with each other, so it is necessary to divide the gain into values for start-up control and steady-state control, and switchable configurations are required. There is.
- the primary magnetic flux command value output unit 16a receives the ⁇ -axis current I ⁇ as an input, and outputs a steady-state primary magnetic flux command value ⁇ _T * used in the “steady control mode”.
- the steady-state primary magnetic flux command value ⁇ _T * is stored in advance in the primary magnetic flux command value output unit 16a as a data table for the ⁇ -axis current I ⁇ , and the primary magnetic flux command value output unit 16a is stored in the data table.
- the steady-state primary magnetic flux command value ⁇ _T * for the input ⁇ -axis current I ⁇ is output.
- the filter 17a outputs a value ⁇ _T * ′ obtained by multiplying the output of the primary magnetic flux command value output unit 16a by a primary delay filter.
- the initial primary magnetic flux command value ⁇ _K * calculated by the steady control parameter initial value calculation unit 12a is used as the initial value of the value ⁇ _T * ′ that is the output of the filter 17a.
- FIG. 6 is a timing chart from the starting time to the steady time in the second embodiment.
- (a) shows whether the terminal positions of the switches 18, 19 a, and 20 are on the a terminal side or the b terminal side
- (b) shows the start time ⁇ input to the start control unit 8.
- the shaft current command value I ⁇ _K * and the startup ⁇ -axis current command value I ⁇ _K * are shown
- (c) shows the primary magnetic flux command value ⁇ * input to the steady control unit 13a
- (d) shows the angular velocity command value ⁇ . * Indicates.
- operations other than (c) are the same as those in the first embodiment, description thereof will be omitted.
- FIG. 7 is a flowchart showing the operation of the steady control parameter initial value calculation unit 12a in the second embodiment.
- the flow process shown in FIG. 7 is repeatedly performed for the period from time t1 to time t2, for each control cycle of the inverter control unit 6a, for example, for each carrier cycle of the PWM signal.
- processes other than S3a, S9a, S10a, and S11a are the same as those in FIG.
- the startup output voltage vector Va_K and the steady output voltage vector Va_T coincide with each other, and the switches 18, 19a, 20 are moved from the a terminal side to the b terminal side.
- the starting primary magnetic flux command value ⁇ _K * is set as an initial value of the value ⁇ _T * ′ that is the output of the filter 17a, and the phase ⁇ that is the output of the integrator 11 is corrected by the axial error ⁇ ,
- the output voltage vector Va can be shifted without fluctuation.
- the startup that calculates the voltage command value according to the magnitude of the phase current of the three-phase synchronous motor
- the embodiment includes a control unit and a steady control parameter initial value calculation unit that calculates a control parameter initial value of the steady control unit so that output voltage vectors match when switching from the startup control unit to the steady control unit. The same effect as 1 is obtained.
- the present invention includes not only the synchronous motor control apparatus described in the first and second embodiments, but also such a synchronous motor control method. That is, a step of calculating and outputting a startup voltage command value by the phase current of the synchronous motor and the DC voltage of the DC power source, a step of calculating and outputting a steady-state voltage command value using the voltage equation, When the voltage command value for converting DC power to AC power is switched from the startup voltage command value to the steady voltage command value, the output voltage vector to the synchronous motor and the steady voltage command value based on the startup voltage command value
- the present invention also includes a method for controlling a synchronous motor including a step of calculating a steady-state control parameter initial value so that the output voltage vector to the synchronous motor matches with the above. By controlling the synchronous motor in this way, it is possible to stabilize the start-up of the synchronous motor and reduce the environmental load.
- the magnitude and phase of the output voltage vector from the inverter main circuit to the synchronous motor at the steady state are controlled by repeated calculation. It is preferable to approximate each cycle. This is because even if the current detector and the voltage detector perform erroneous detection due to noise, the output voltage vector at the normal time can be converged to the output voltage vector at the start-up.
- a compressor driving device including the synchronous motor control device described in the first and second embodiments and a permanent magnet synchronous motor connected to the compressor is also included in the present invention. That is, the synchronous motor control device described in the first and second embodiments can be applied to a compressor driving device that drives a compressor, and such a compressor driving device can be stably started. It is.
- Such a compressor drive device can be applied to a compressor that circulates a refrigerant of an air conditioner, and an air conditioner including such a compressor is also included in the present invention.
- an air conditioner can be stably started.
- the configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.
- 1 DC power supply 2 inverter main circuit, 3 three-phase synchronous motor, 3a stator, 3b permanent magnet rotor, 4a, 4b current detector, 5 voltage detector, 6, 6a inverter control unit, 7 current coordinate conversion unit, 8 start control unit, 9 voltage coordinate conversion unit, 10 PWM signal generation unit, 11 integrator, 12, 12a steady control parameter initial value calculation unit, 13, 13a steady control unit, 14 frequency compensation amount calculation unit, 15 subtractor, 16 Correction current command value output unit, 16a Primary magnetic flux command value output unit, 17, 17a filter, 18, 19, 19a, 20 switch.
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Abstract
Description
図1は、本発明の実施の形態1に係る同期電動機制御装置の構成を示すブロック図である。図1に示すように、本実施の形態1の同期電動機制御装置は、直流電源1に接続され、複数のスイッチング素子から構成されたインバータ主回路2と、インバータ主回路2が出力する交流電力により駆動される三相同期電動機3と、三相同期電動機3の相電流値を検出する電流検出器4a,4bと、直流電源1の直流電圧値を検出する電圧検出器5と、角速度指令値、電流検出器4a,4bが検出した相電流値及び電圧検出器5が検出した直流電圧値が入力されて、インバータ主回路2の複数のスイッチング素子のオンオフを制御するためのPWM信号を生成してインバータ主回路2に出力するインバータ制御部6とを備える。図1において、直流電源1が接続されたインバータ主回路2は、電力スイッチング素子SW1,SW2,SW3,SW4,SW5,SW6と、電力スイッチング素子SW1,SW2,SW3,SW4,SW5,SW6の各々に逆並列で接続されたダイオードD1,D2,D3,D4,D5,D6と、電力スイッチング素子SW1,SW2,SW3,SW4,SW5,SW6の図示しない駆動回路とを備え、直流電源1からの直流を交流に変換して三相同期電動機3を駆動する。インバータ主回路2は、一例として、IPM(Intelligent Power Module)により構成される。三相同期電動機3は、U相、V相及びW相からなる三相Y形結線の固定子3aと、永久磁石回転子3bとを備える。図1においては、電力スイッチング素子SW1,SW2,SW3,SW4,SW5,SW6をIGBT(Insulated Gate Bipolar Transistor)としているが、本発明はこれに限定されるものではない。また、直流電源1は、一例として、交流電源を整流し、平滑して生成されるものであってもよい。なお、ここでは同期電動機として三相同期電動機を例示しているが、本発明はこれに限定されるものではない。
実施の形態1における定常制御部13は、三相同期電動機3の定常状態での電圧方程式に補正項Icmpにゲインを乗じて加算し、電圧指令値を演算するようにしたものであるが、本実施の形態2では、定常制御部に一次磁束制御を用いる形態を説明する。
Claims (5)
- 直流電源に接続され、複数のスイッチング素子から構成されたインバータ主回路と、
前記インバータ主回路が出力する交流電力により駆動される同期電動機と、
前記同期電動機の相電流値を検出する電流検出器と、
前記直流電源の直流電圧値を検出する電圧検出器と、
角速度指令値、前記相電流値及び前記直流電圧値が入力されて、前記複数のスイッチング素子のオンオフを制御するためのPWM信号を生成して前記インバータ主回路に出力するインバータ制御部とを備え、
起動時と定常時で異なる動作モードにより動作する前記インバータ制御部が、
前記インバータ主回路へのPWM信号を生成するPWM信号生成部と、
前記起動時の動作モードによる動作時に、前記相電流値に応じた起動時電圧指令値を前記PWM信号生成部に出力する起動制御部と、
前記定常時に、電圧方程式を用いて定常時電圧指令値を演算して前記PWM信号生成部に出力する定常制御部と、
前記起動時の動作モードから前記定常時の動作モードに切り換える際に、前記インバータ主回路から前記同期電動機への出力電圧ベクトルが切り換えの前後で一致するように前記定常制御部の制御パラメータ初期値を前記定常制御部に出力する定常制御パラメータ初期値演算部とを備えたことを特徴とする同期電動機制御装置。 - 請求項1に記載の同期電動機制御装置と、
圧縮機に接続された永久磁石同期電動機である前記同期電動機とを備えることを特徴とする圧縮機駆動装置。 - 請求項2に記載の圧縮機駆動装置と、前記圧縮機とを備え、
前記圧縮機が冷媒を循環させて動作することを特徴とする空気調和機。 - 直流電源の直流電力を交流電力に変換してインバータ主回路からの出力電圧ベクトルによって駆動する同期電動機の制御方法であって、
前記同期電動機の相電流及び前記直流電源の直流電圧によって起動時電圧指令値を演算して出力するステップと、
電圧方程式を用いて定常時電圧指令値を演算して出力するステップと、
前記直流電源の直流電力を交流電力に変換する際の電圧指令値を前記起動時電圧指令値から前記定常時電圧指令値に切り換わる際に、前記起動時電圧指令値による前記インバータ主回路から前記同期電動機への出力電圧ベクトルと前記定常時電圧指令値による前記インバータ主回路から前記同期電動機への出力電圧ベクトルとが一致するように定常制御パラメータ初期値を演算するステップと、を備えたことを特徴とする同期電動機の制御方法。 - 前記定常制御パラメータ初期値を演算するステップでは、
前記インバータ主回路から前記同期電動機への定常時の出力電圧ベクトルの大きさ及び位相を繰り返し演算によって起動時の出力電圧ベクトルの大きさ及び位相に制御周期毎に近づけることを特徴とする請求項4に記載の同期電動機の制御方法。
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AU2015404233A AU2015404233B2 (en) | 2015-08-04 | 2015-08-04 | Synchronous motor control device, compressor drive device, air-conditioner, and method for controlling synchronous motor |
EP15893547.8A EP3168980B1 (en) | 2015-08-04 | 2015-08-04 | Synchronous motor control device, compressor drive device, air-conditioner, and method for controlling synchronous motor |
JP2017532303A JP6400209B2 (ja) | 2015-08-04 | 2015-08-04 | 同期電動機制御装置、圧縮機駆動装置、空気調和機及び同期電動機の制御方法 |
CN201580081618.8A CN107836079B (zh) | 2015-08-04 | 2015-08-04 | 同步电动机控制装置、压缩机驱动装置、空气调节机以及同步电动机的控制方法 |
US15/744,923 US10696141B2 (en) | 2015-08-04 | 2015-08-04 | Synchronous motor control device and method of controlling synchronous motor |
PCT/JP2015/072118 WO2017022083A1 (ja) | 2015-08-04 | 2015-08-04 | 同期電動機制御装置、圧縮機駆動装置、空気調和機及び同期電動機の制御方法 |
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