WO2016050045A1 - Procédé de commande de climatiseur à fréquence variable - Google Patents

Procédé de commande de climatiseur à fréquence variable Download PDF

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Publication number
WO2016050045A1
WO2016050045A1 PCT/CN2015/076184 CN2015076184W WO2016050045A1 WO 2016050045 A1 WO2016050045 A1 WO 2016050045A1 CN 2015076184 W CN2015076184 W CN 2015076184W WO 2016050045 A1 WO2016050045 A1 WO 2016050045A1
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WO
WIPO (PCT)
Prior art keywords
air conditioner
main circuit
axis current
compressor
value
Prior art date
Application number
PCT/CN2015/076184
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English (en)
Chinese (zh)
Inventor
王斌
Original Assignee
海信科龙电器股份有限公司
广东科龙空调器有限公司
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Application filed by 海信科龙电器股份有限公司, 广东科龙空调器有限公司 filed Critical 海信科龙电器股份有限公司
Publication of WO2016050045A1 publication Critical patent/WO2016050045A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/56—Remote control
    • F24F11/59—Remote control for presetting

Definitions

  • the present invention relates to the field of inverter air conditioners, and more particularly to an inverter air conditioner control method.
  • the inverter air conditioner is a special compressor for frequency conversion based on the ordinary air conditioner, and the frequency conversion control system is added.
  • the main unit of the inverter air conditioner is automatically steplessly variable, which can automatically provide the required amount of cold (heat) according to the indoor situation; when the indoor temperature reaches the desired value, the air conditioner main unit operates at a constant speed that can accurately maintain this temperature. Achieve "no downtime" to ensure stable ambient temperature.
  • variable frequency control system is generally referred to as a variable frequency controller.
  • the frequency conversion controller is usually a frequency converter of "AC-DC-AC" circuit structure. Its working principle is that AC power is obtained by the rectifier circuit to obtain DC power, and then filtered by the electrolytic capacitor. Finally, the AC voltage of the inverter circuit is adjustable. Drive the inverter compressor to work. On the one hand, such an inverter controller has a large electrolytic capacitor and a high cost, and at the same time, the controller is bulky due to the large electrolytic capacitor capacity.
  • the present invention provides a low-cost inverter air conditioner control method for overcoming at least one of the above-mentioned drawbacks (deficiencies) of the prior art.
  • An inverter air conditioner control method is applied to an inverter air conditioner controller, wherein the controller comprises a main control MCU, a rectification and PFC unit circuit, a three-phase inverter circuit, an AC voltage detecting unit connected to the main control MCU, and The main circuit bus voltage detection circuit, the main control MCU is connected with the compressor phase current iU/iV detection signal, the main control MCU drives the three-phase inverter circuit through the inverter drive circuit and drives the PFC unit through the PFC drive circuit, in the rectification and A storage capacitor C is connected between the PFC unit circuit and the three-phase inverter circuit; the method includes:
  • the q-axis current in the compressor is compensated and controlled.
  • the compensation mode is: update the q-axis current command value according to the main circuit bus voltage Vp and participate in the traditional FOC vector algorithm, and increase the q-axis current command value when Vp rises, and adjust the V-axis current command value when Vp rises. Low q-axis current command value.
  • the main circuit bus voltage detecting circuit detects the main circuit bus voltage Vp, and then according to Vp updates the command value of the q-axis current to complete the compensation of the q-axis current.
  • Vp rises the q-axis current command value is increased.
  • Vp falls the q-axis current command value is lowered to make the Vp and q-axis current command values.
  • Matching the output of higher electric power is achieved at a higher voltage in a half-frequency cycle, and the lower electric power is output at a lower voltage, thereby significantly reducing the demand for the storage capacitor capacity and increasing the power density of the controller. Reduce the size of the controller and reduce costs.
  • the compensation mode is specifically: generating a modulation coefficient Mv according to the main circuit bus voltage Vp, and multiplying the Mv by the q-axis current command value as a new q-axis current command value to participate in the conventional FOC vector algorithm.
  • the function f(Vp/V_p) can take many forms.
  • the invention obtains the instantaneous voltage value Vp of the bus voltage by detecting the DC voltage Vp value of the main circuit bus, and averages Vp in a period T to obtain an average value V_p, where T is a continuous T time before the current adoption period.
  • the ratio of Vp/V_p is used to obtain the fluctuation ratio of the DC voltage of the bus.
  • This voltage fluctuation ratio is used as the compensation parameter to compensate the iq current.
  • the q-axis current is used for work. The compensation can output a large power when the voltage fluctuation ratio is high, and the output power becomes small when the fluctuation is small.
  • the method further includes performing a field weakening control on the compressor, specifically:
  • the idref is set according to the main circuit bus voltage Vp, and the idref value is adjusted when i q and i d satisfy the following formula, otherwise the idref value is controlled according to the non-compensation method:
  • k is a constant greater than zero and less than Vp
  • Ld is the d-axis inductance
  • Lq is the q-axis inductance
  • ⁇ is the compressor speed
  • ⁇ is the compressor rotor flux
  • i d is the d-axis current of the compressor
  • i q is the q-axis current of the compressor
  • idref is The d-axis current command value of the compressor.
  • the value of k is used to avoid the detection error of the Vp value, so that the controller should enter the field weakening control without entering the field weakening control
  • the k value is a reserved deviation voltage value.
  • the invention can avoid voltage saturation at the bottom of the bus DC voltage by the field weakening control.
  • the controller performs the compensation control, the output power is small when the controller is running at a low frequency. At this time, the energy storage effect of the electrolytic capacitor is relatively good, so the compensation amount can be appropriately reduced at this time to improve the compressor noise during low frequency operation.
  • the problem is that by changing the Mv value, the amount of compensation can be reduced, and the compressor noise problem at low frequency operation can be improved.
  • the capacitance of the storage capacitor C is less than the product of the maximum allowable output power of the inverter air conditioner controller of 0.5 ⁇ F/W.
  • the rectifying and inductive branch in the PFC unit circuit of the PFC unit circuit has a damping resistor in series. Since the inductor exists in the PFC circuit, and the compressor is a load with inductive characteristics, an unstable oscillating circuit structure is formed when combined with the storage capacitor. By setting the damper circuit, the oscillating amplitude can be effectively reduced, and the stability of the controller is provided. .
  • the resistance of the damping resistor is greater than or equal to 0.1 ohms.
  • the main circuit bus voltage detecting circuit detects the main circuit bus voltage Vp, and then updates the command value of the q-axis current according to Vp, thereby completing the compensation of the q-axis current, and increasing the q-axis current command value when Vp rises.
  • Vp falls, the q-axis current command value is lowered to match Vp with the q-axis current command value, so that a higher electric power is output at a higher voltage in a half-duty cycle, and a lower output at a lower voltage.
  • Electric power which significantly reduces the need for storage capacitor capacity, increases the power density of the controller, reduces the size of the controller, and thus reduces costs.
  • Figure 1 is a block diagram of the circuit of the present invention.
  • FIG. 2 is a block diagram of the algorithm control principle of the present invention.
  • Figure 3 is a block diagram of the circuit with interleaved PFC.
  • Rectifier and PFC unit circuit 1. Rectifier and PFC unit circuit; 2. AC voltage monitoring unit; 3. Main circuit bus current detection circuit; 4. Main circuit bus voltage detection circuit; 5. Inverter drive circuit; 6. Three-phase inverter circuit; PFC drive circuit; 8, master MCU.
  • mounting and “connecting” are to be understood broadly, and may be, for example, a fixed connection, a detachable connection, or an integral, unless otherwise explicitly stated and defined.
  • Ground connection it can be a mechanical connection or an electrical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium, and it can be said that the internal connection of the two elements.
  • the specific meaning of the above terms in the present invention can be understood in the specific circumstances by those skilled in the art.
  • the invention relates to an inverter air conditioner control method.
  • the method is applied to an inverter air conditioner controller, and the rated input voltage is 220Vac, 50Hz, and the rated busbar working current is 8A.
  • the controller includes a main control MCU8, a rectification and a PFC unit.
  • Capacitor C2 the method includes:
  • the q-axis current in the compressor is compensated and controlled.
  • the compensation mode is: update the q-axis current command value according to the main circuit bus voltage Vp and participate in the traditional FOC vector algorithm, and increase the q-axis current command value when Vp rises, and adjust the V-axis current command value when Vp rises. Low q-axis current command value. .
  • the main circuit bus voltage detecting circuit detects the main circuit bus voltage Vp, and then updates the command value of the q-axis current according to Vp, thereby completing the q-axis current. Compensation, increase the q-axis current command value when Vp rises, and lower the q-axis current command value when Vp falls, so that Vp and q-axis current command value are matched, so that the output is higher at a higher voltage in half of the power frequency cycle. High electrical power, lower output power at lower voltages, significantly reducing the need for storage capacitor capacity, increasing the power density of the controller, reducing the size of the controller, and thus reducing costs.
  • the compensation mode is specifically: generating a modulation coefficient Mv according to the main circuit bus voltage Vp, and multiplying the Mv by the q-axis current command value as a new q-axis current command value to participate in the conventional FOC vector algorithm.
  • the function f(Vp/V_p) can take many forms.
  • N 1
  • Mv Vp/V_p
  • the sampling interval of the DC voltage Vp of the main circuit bus is 1 mS
  • 200 sampling periods are included in 0.2 seconds, including 200 Vp samples. The value is averaged over the last 200 Vp samples to get the V_p value.
  • the invention obtains the instantaneous voltage value Vp of the bus voltage by detecting the DC voltage Vp value of the main circuit bus, and averages Vp in a period T to obtain an average value V_p, where T is a continuous T time before the current adoption period. Segment, through the ratio of Vp / V_p, can get the fluctuation ratio of the bus DC voltage, The voltage fluctuation ratio is used as a compensation parameter to compensate the iq current. In the d_q rotating coordinate system, the q-axis current is used for work. Therefore, the compensation can output a large power and fluctuate when the voltage fluctuation ratio is high. When compared, the output power becomes smaller.
  • the method further includes performing a field weakening control on the compressor, specifically:
  • the idref is adjusted according to the main circuit bus voltage Vp, and the idref value is adjusted when i q and i d satisfy the following formula, otherwise the idref value is controlled according to the non-compensation method:
  • Ld is the d-axis inductance
  • Lq is the q-axis inductance
  • ⁇ is the compressor speed
  • ⁇ is the compressor rotor flux
  • i d is the d-axis current of the compressor
  • i q is the q-axis current of the compressor
  • idref is The d-axis current command value of the compressor.
  • the invention can avoid voltage saturation at the bottom of the bus DC voltage by the field weakening control.
  • the capacitance of the storage capacitor C2 of the embodiment satisfies the value of less than 0.5 ⁇ F/W and the maximum allowable output power of the inverter air conditioner controller, taking as small a value as possible, taking into account the conventional capacitor.
  • Capacitance, the preferred value of C2 in this embodiment is 470 ⁇ F, and a 3 ⁇ F film capacitor is connected in parallel, which is much smaller than the capacitance of the electrolytic capacitor used in the current general technology.
  • a rectifying resistor R1 is connected in series with the inductor branch in the PFC unit circuit of the PFC unit circuit 1. Since the inductor exists in the PFC circuit, and the compressor is a load with inductive characteristics, an unstable oscillating circuit structure is formed when combined with the storage capacitor. By setting the damper circuit, the oscillating amplitude can be effectively reduced, and the stability of the controller is provided. .
  • the resistance of the damping resistor R1 is greater than or equal to 0.1 ohm, which is in this embodiment.
  • the resistance value is integrated into the reactor L1, and the resistance of R1 is 0.2 ⁇ .
  • the invention controls the output power of the inverter air conditioner controller by the compensation control mode, reduces the energy storage function of the energy storage capacitor, can effectively reduce the demand for the storage capacitor, improve the power density of the controller, reduce the volume of the controller, and reduce The capacity of the electrolytic capacitor, which in turn reduces costs.
  • the main control MCU 8 detects the main circuit bus current through the main circuit bus current detecting circuit 3, and the main circuit bus current io also participates in the compensation control of the q-axis current.
  • the output power is small when the controller is running at a low frequency.
  • the energy storage effect of the electrolytic capacitor is relatively good, so the compensation amount can be appropriately reduced at this time, and the main circuit bus current io at this time.
  • the effective value is less than the rated value of the rated working current of the main circuit bus, iorms/8 ⁇ 1, the compensation of the q-axis current is reduced, and the q-axis current is matched with the lower operating frequency, which can effectively improve the compressor noise problem during low-frequency operation. Therefore, by changing the Mv value, the amount of compensation can be reduced, and the compressor noise problem at low frequency operation can be improved.
  • Embodiment 1 is improved on the basis of Embodiment 1.
  • a dual PFC is used, and the driving signals of the two PFCs are 180 degrees out of phase, the circuit parameters are completely the same, and the inductance L1
  • the DC resistance Rs with L2 is ⁇ 0.5 ⁇ .

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)
  • Control Of Ac Motors In General (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Signal Processing (AREA)

Abstract

La présente invention concerne un procédé de commande de climatiseur à fréquence variable, applicable dans un organe de commande de climatiseur à fréquence variable, comprenant : la réalisation d'une commande de compensation sur un courant d'arbre q dans un compresseur, le procédé de compensation consistant à : mettre à jour une valeur de commande de courant d'arbre q sur la base d'une tension de bus de circuit principal Vp et participer à un algorithme vectoriel FOC classique, augmenter la valeur de commande de courant d'arbre q lorsque Vp monte et diminuer la valeur de commande de courant d'arbre q lorsque Vp chute.
PCT/CN2015/076184 2014-09-30 2015-04-09 Procédé de commande de climatiseur à fréquence variable WO2016050045A1 (fr)

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CN201410520531.3 2014-09-30
CN201410520531.3A CN104534631B (zh) 2014-09-30 2014-09-30 一种变频空调控制方法

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CN110011294A (zh) * 2019-05-05 2019-07-12 珠海格力电器股份有限公司 电压补偿电路及其控制方法和空调驱动系统
CN114608158A (zh) * 2022-02-18 2022-06-10 青岛海尔空调器有限总公司 用于控制直流空调器的方法及装置、空调器
CN115682361A (zh) * 2022-11-16 2023-02-03 宁波奥克斯电气股份有限公司 一种空调器的控制方法、控制装置以及空调器
WO2023226011A1 (fr) * 2022-05-27 2023-11-30 STMicroelectronics (Beijing) R&D Co. Ltd Commande de tension de bus cc variable dans un moteur

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CN108631606B (zh) * 2017-03-20 2019-11-05 奥克斯空调股份有限公司 一种功率变换电路以及纹波电流抑制方法
CN108054913B (zh) * 2018-01-29 2023-11-28 广东美的制冷设备有限公司 Pfc电路、电机控制系统及变频空调器

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CN114608158A (zh) * 2022-02-18 2022-06-10 青岛海尔空调器有限总公司 用于控制直流空调器的方法及装置、空调器
CN114608158B (zh) * 2022-02-18 2024-02-20 青岛海尔空调器有限总公司 用于控制直流空调器的方法及装置、空调器
WO2023226011A1 (fr) * 2022-05-27 2023-11-30 STMicroelectronics (Beijing) R&D Co. Ltd Commande de tension de bus cc variable dans un moteur
CN115682361A (zh) * 2022-11-16 2023-02-03 宁波奥克斯电气股份有限公司 一种空调器的控制方法、控制装置以及空调器

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