CN112910232A - Air conditioning system - Google Patents
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- CN112910232A CN112910232A CN202110295732.8A CN202110295732A CN112910232A CN 112910232 A CN112910232 A CN 112910232A CN 202110295732 A CN202110295732 A CN 202110295732A CN 112910232 A CN112910232 A CN 112910232A
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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Abstract
The invention discloses an air conditioning system, which comprises a driving system, a control system and a control module, wherein the driving system is positioned in a compressor and comprises a frequency converter and the control module; wherein the control module is configured to utilize formula Id=idqCalculating d-axis correction output current i of frequency converter by Kpi sin (theta-delta theta)d(ii) a The d-axis corrected output current idI of (a)dqFor frequency converters at any time t0The resultant current value of the d-axis and q-axis current vectors, Kpi is a gain value, and θ is any time t0Δ θ is a phase angle difference constant; the control module is configured to utilize a calculation formula: i.e. iq=idq'Kpi cos (theta-delta theta)' calculating q-axis corrected output current i of frequency converterq(ii) a According to the invention, a voltage fluctuation value is introduced, and a corresponding gain value is calculated according to the voltage fluctuation value, so that the output current is corrected; the output current pulsation of the motor driving system without the electrolytic capacitor caused by the small capacitance and the nonpolar capacitance of the bus is effectively inhibited, the waveform of the output current is improved, and the load capacity of the motor driving system without the electrolytic capacitor is improved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioning system.
Background
The existing air-conditioning system mostly adopts an electrolytic capacitor-free frequency converter, and the electrolytic capacitor used for energy storage on the frequency converter is replaced by a thin-film capacitor so as to avoid the problems of low service life and high temperature rise of the electrolytic capacitor and have certain economic benefit; however, when a small-capacity film capacitor is used instead of a large-capacity electrolytic capacitor, the bus voltage fluctuation of the frequency converter can cause the motor current to generate periodic pulsation. This problem has a certain effect on both the load carrying capacity and the reliability of the frequency converter.
At present, in the application of the frequency converter without the electrolytic capacitor, a hardware circuit is generally adopted to sample the current and voltage phases at the input end of the frequency converter, so that the output current is adjusted according to the input power, and the effect of inhibiting the current pulsation is further achieved. However, in the method, as part of hardware circuits are additionally added, the size of the frequency converter substrate is increased, and the production cost is increased; meanwhile, the newly added hardware circuit can cause the problems of increased system failure rate, reduced integral reliability of the frequency converter and the like, and further influences the quality of the air conditioning system.
In summary, an air conditioning system is needed to solve the problem of current ripple of the electrolytic capacitor inverter in the prior art.
Disclosure of Invention
In order to solve the above problems in the prior art, the present invention provides an air conditioning system, which can effectively suppress the pulsation of the output current of the inverter without adding an external hardware circuit.
In order to achieve the purpose, the invention adopts the following technical scheme:
an air conditioning system comprising:
the driving system is positioned in the compressor and comprises a frequency converter and a control module;
the control module is used for calculating d-axis correction output current i of the frequency converterd；
The d-axis corrected output current idThe calculation formula of (2) is as follows:
Id＝idq*Kpi*sin(θ-Δθ)；
idqfor frequency converters at any time t0The resultant current value of the d-axis and q-axis current vectors, Kpi is a gain value, and θ is any time t0Δ θ is a phase angle difference constant;
the control module is used for calculating q-axis correction output current i of the frequency converterq；
The q-axis corrected output current iqThe calculation formula of (2) is as follows:
iq＝idq*Kpi*cos(θ-Δθ)；
the control module is also used for acquiring a bus voltage detection value U in real timedcThe sampling period is T.
In some embodiments of the invention, the control module comprises a PI controller for calculating the gain value Kpi; the calculation formula of the gain value Kpi is as follows:
wherein S is a Laplace operator; ki is an integral gain constant; kp is a proportional gain constant; u shapedc_lpfA low pass filtered value for the bus voltage; u shaperampIs the voltage fluctuation value of the bus voltage.
In some embodiments of the invention, the control module further comprises a low-pass filtering unit for calculating a low-pass filtered value U of the bus voltagedc_lpfThe calculation formula is as follows:
wherein, Ud′c_lpfA low-pass filtered value of the bus voltage in the previous sampling period T'; omegadcIs the characteristic angular frequency of the low-pass filter unit.
In some embodiments of the invention, the control module is further configured to calculate a voltage fluctuation value UrampSaid voltage fluctuation value UrampThe calculation formula of (2) is as follows:
Uramp＝Udc-Udc-lpf。
in some embodiments of the inventionThe control module is also used for setting the fluctuation period T of the bus voltageramp。
In some embodiments of the invention, the phase angle θ and the period of fluctuation TrampSatisfies the following equation:
in some embodiments of the present invention, the low-pass filtering unit employs a first-order low-pass filter; the transfer function is as follows:
in some embodiments of the present invention, the integral gain constant Ki ranges from 0.00001 to 0.00002; the value range of the proportional gain constant Kp is 0.1-0.3.
In some embodiments of the invention, the phase angle difference constant is in the range of 0.1 to 0.2 rad.
In some embodiments of the invention.
Compared with the prior art, the technical scheme of the invention has the following technical effects:
in the invention, the output current of the frequency converter is used as a control quantity, a voltage fluctuation value is introduced, and a corresponding gain value is calculated according to the voltage fluctuation value, so that the output current is corrected; the output current pulsation of the motor driving system without the electrolytic capacitor caused by the small capacitance and the nonpolar capacitance of the bus is effectively inhibited, the waveform of the output current is improved, and the load capacity of the motor driving system without the electrolytic capacitor is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram of the voltage fluctuation value.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The air conditioner performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator in the present application. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.
The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a cooling effect by heat-exchanging with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.
The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.
The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in a cooling mode.
An air conditioning system comprising:
the driving system is positioned in the compressor and comprises a frequency converter and a control module;
the control module is used for calculating d-axis correction output current i of the frequency converterd；
The d-axis corrected output current idThe calculation formula of (2) is as follows:
Id＝idq*Kpi*sin(θ-Δθ)；
idqfor frequency converters at any time t0The resultant current value of the d-axis and q-axis current vectors, Kpi is a gain value, and θ is any time t0Δ θ is a phase angle difference constant;
the control module is used for calculating q-axis correction output current i of the frequency converterq；
The q-axis corrected output currentiqThe calculation formula of (2) is as follows:
iq＝idq*Kpi*cos(θ-Δθ)；
the control module is also used for acquiring a bus voltage detection value U in real timedcThe sampling period is T.
In some embodiments of the invention, before correcting the q-axis output current and the d-axis output current of the frequency converter, the air conditioning system samples the bus current by arranging a current sensor on the bus; and performing current reconstruction according to the sampling result and the state of the bridge arm switch to obtain the three currents at the moment. Since the current adoption and reconfiguration functions are implemented by a common method in the motor control industry, they are not described in detail here.
In some embodiments of the present invention, the rotor position and angle at the present time are obtained using a state observer based on the reconstructed three currents. In addition, a divider resistor is arranged on the bus to sample the bus voltage.
In some embodiments of the present invention, a low-pass filtering unit is further included in the air conditioning system, specifically, the low-pass filtering unit employs a first-order low-pass filter; removing higher harmonics in the bus voltage to obtain a reference line of the bus voltage; the transfer function is as follows:
s is a Laplace operator; omegadcIs the characteristic angular frequency of the low-pass filter unit.
After time domain conversion, the low-pass filtering value U of the bus voltagedc_lpfThe calculation formula of (2) is as follows:
wherein, Ud′c_lpfA low-pass filtered value of the bus voltage in the previous sampling period T'; omegadcFor the characteristic angular frequency of the low-pass filtering unit,t is the sampling period.
In some embodiments of the invention, the control module is further configured to calculate a voltage fluctuation value UrampSaid voltage fluctuation value UrampThe calculation formula of (2) is as follows:
Uramp＝Udc-Udc_lpf。
the voltage fluctuation value UrampMeans that at the present moment, the bus voltage UdcLow-pass filtered value U of bus voltagedc_lpfWith reference to FIG. 1, Udc_lpfThe voltage value is considered as the voltage value which the bus is supposed to be in when the bus is not fluctuated under the ideal state, and when the driving system operates at the voltage fluctuation value UrampWhen the current is in the positive region, the voltage supply is higher at the moment, and the PWM duty ratio should be reduced according to the current loop control of the conventional FOC, namely the duty ratio of a high level in a sampling period needs to be reduced, and the output current of a corresponding frequency converter is reduced;
when the driving system operates at a voltage fluctuation value UrampIn the negative region, the voltage supply is low at this time, and according to the current loop control of the conventional FOC, the PWM duty ratio should be increased at this time, that is, the duty ratio of the high level in the sampling period needs to be increased, and the output current of the corresponding inverter is increased. The above two conditions cause the root cause of the output current ripple of the driving system.
In some embodiments of the invention, in order to suppress ripple of the output current of the drive system, the control module comprises a PI controller that varies by a voltage fluctuation value UrampCompensating the output current of the frequency converter as a reference value, namely calculating the gain value Kpi; the calculation formula of the gain value Kpi is as follows:
wherein S is a Laplace operator; ki is an integral gain constant; kp is a proportional gain constant; u shapedc_lpfA low pass filtered value for the bus voltage; u shaperampIs a busVoltage fluctuation value of the voltage.
In some embodiments of the invention, the control module is further configured to set a period of fluctuation T of the bus voltageramp. In the presence of voltage fluctuation value UrampDuring the calculation, the bus voltage detection value U at the moment can be determineddcIs of a period T of fluctuationramp。
In some embodiments of the invention, the phase angle θ and the period of fluctuation TrampSatisfies the following equation:
this formula represents any time t0Correspondingly, the phase angle theta.
In some embodiments of the present invention, because the inertia of the driving system is large, when compensating the output current of the frequency converter, a phase earlier than the voltage fluctuation is required, and the phase angle difference between the phase of the compensation point and the phase of the voltage fluctuation point is Δ θ; the phase angle difference delta theta is an empirical value and has a value range of 0.1-0.2 rad; the phase angle difference Δ θ is 0.116rad in this example.
In some embodiments of the present invention, the integral gain constant Ki ranges from 0.00001 to 0.00002; the value range of the proportional gain constant Kp is 0.1-0.3.
In some embodiments of the invention, the integral gain constant Ki is 0.000015; the proportional gain constant Kp is 0.28.
Compared with the prior art, the technical scheme of the invention has the following technical effects:
according to the invention, the output current of the frequency converter is used as a control quantity, a voltage fluctuation value is introduced, the voltage fluctuation value is obtained by comparing the acquired real-time bus voltage value with a low-pass filtering value after the real-time bus voltage value passes through a first-order low-pass filter, on one hand, the fluctuation period is obtained through the voltage fluctuation value, and the output current of the frequency converter can be periodically regulated and controlled; on the other hand, the corresponding gain value is calculated according to the fluctuation condition of the voltage fluctuation value, so that the output current is corrected; specifically, when the voltage fluctuation value is in a positive region, the gain value is increased for reducing the output current; similarly, when the voltage fluctuation value is in a negative region, the gain value is reduced to increase the output current;
in addition, in consideration of inertia of a driving system, a phase angle difference is introduced, so that a compensation point when the control module outputs a gain value is earlier than a point when the voltage fluctuates, and the output gain value is just used for output current at the voltage fluctuation point.
The invention effectively inhibits the output current pulsation of the motor driving system without the electrolytic capacitor caused by the small capacitance and the nonpolar capacitance of the bus, improves the waveform of the output current and promotes the load carrying capacity of the motor driving system without the electrolytic capacitor.
In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An air conditioning system, comprising:
the driving system is positioned in the compressor and comprises a frequency converter and a control module;
the control module is used for calculating d-axis correction output current i of the frequency converterd；
The d-axis corrected output current idThe calculation formula of (2) is as follows:
Id＝idq*Kpi*sin(θ-Δθ)；
idqfor frequency converters at any time t0The resultant current value of the d-axis and q-axis current vectors, Kpi is a gain value, and θ is any time t0Δ θ is a phase angle difference constant;
the control module is used for calculating q-axis correction output current i of the frequency converterq；
The q-axis corrected output current iqThe calculation formula of (2) is as follows:
iq＝idq*Kpi*cos(θ-Δθ)。
2. the air conditioning system of claim 1, wherein the control module is further configured to collect a bus voltage detection value U in real timedcThe sampling period is T.
3. The air conditioning system of claim 2, wherein the control module includes a PI controller for calculating the gain value Kpi; the calculation formula of the gain value Kpi is as follows:
wherein S is a Laplace operator; ki is an integral gain constant; kp is a proportional gain constant; u shapedc_lpfA low pass filtered value for the bus voltage; u shaperampIs the voltage fluctuation value of the bus voltage.
4. The air conditioning system of claim 3, wherein the control module further comprises a low pass filtering unit for calculating a low pass filtered value U of the bus voltagedc_lpfThe calculation formula is as follows:
wherein, U'dc_lpfA low-pass filtered value of the bus voltage in the previous sampling period T'; omegadcIs the characteristic angular frequency of the low-pass filter unit.
5. The air conditioning system of claim 3, wherein the control module is further configured to calculate a voltage fluctuation value UrampSaid voltage fluctuatesValue UrampThe calculation formula of (2) is as follows:
Uramp＝Udc-Udc_lpf。
6. the air conditioning system of claim 1, wherein the control module is further configured to set a period of fluctuation T of the bus voltageramp。
7. The air conditioning system of claim 6, wherein the phase angle θ is related to the period of fluctuation TrampSatisfies the following equation:
8. the air conditioning system as claimed in claim 4, wherein the low pass filtering unit employs a first order low pass filter; the transfer function is as follows:
9. the air conditioning system as claimed in claim 3, wherein the integral gain constant Ki has a value in the range of 0.00001 to 0.00002; the value range of the proportional gain constant Kp is 0.1-0.3.
10. The air conditioning system of claim 1, wherein the phase angle difference constant is in a range of 0.1-0.2 rad.
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| CN112910232B (en) | 2022-04-19 |
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