CN214314575U - Harmonic suppression device, power supply device, and electric appliance - Google Patents

Harmonic suppression device, power supply device, and electric appliance Download PDF

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CN214314575U
CN214314575U CN202120433804.6U CN202120433804U CN214314575U CN 214314575 U CN214314575 U CN 214314575U CN 202120433804 U CN202120433804 U CN 202120433804U CN 214314575 U CN214314575 U CN 214314575U
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capacitor
relay
circuit module
current
phase
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方小斌
郑嘉良
于洪涛
宋现义
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics

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Abstract

The utility model provides a harmonic suppression device, power supply unit and electrical equipment relates to motor technical field, and wherein the device includes: the tuning circuit module is connected with a first live wire and a second live wire of the three-phase power supply to perform resonance adjustment processing; the PI type resonance filter circuit module is respectively connected with the tuning circuit module and a third live wire of the three-phase power supply and is used for carrying out harmonic filtering processing on the first phase current, the second phase current and the third phase current which are processed by the tuning circuit module; and the rectifier circuit module is connected with the PI type resonance filter circuit module and used for carrying out rectification processing and supplying power to a load. The utility model can adjust the input voltage, the current phase, the matching impedance and the multiple resonance points in real time, realize the three-phase power factor correction, ensure that the THD of the harmonic wave of each phase current meets the requirement and the standby power consumption meets the standard; the control is simple, the cost is low, and the reliability is high.

Description

Harmonic suppression device, power supply device, and electric appliance
Technical Field
The utility model relates to the technical field of electric machines, especially, relate to a harmonic suppression device, power supply unit and electrical equipment.
Background
European standard EN 61000-3-2 requires that the input current of each phase of the three-phase power supply air conditioning equipment is less than or equal to 16A, and each harmonic of the input current of each phase is forced to meet the requirement that THD is less than 5%. The conventional design adopts an active power factor correction circuit (APFC circuit) to meet the requirement of 2-40 harmonic waves. As shown in fig. 1, the circuit is an existing typical three-phase APFC circuit, and the circuit adopts an IPM module, a reactor, an ac input voltage, a current sampling conditioning circuit, and a DSP control circuit to form a PWM controllable rectification scheme, which has complex software design, great technical difficulty, high power factor, and high cost and poor reliability. Therefore, how to design a harmonic suppression circuit with simple control and high reliability is a technical problem to be solved in the industry.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a harmonic suppression device, a power supply device, and an electrical apparatus, which can perform PI type tunable resonant filtering processing on each phase current of a three-phase power supply, and perform rectification processing.
According to the utility model discloses an aspect provides a harmonic suppression device, include: the tuning circuit module is connected with a first live wire and a second live wire of a three-phase power supply and used for carrying out resonance adjustment processing on a first phase current input through the first live wire and a second phase current input through the second live wire; the PI type resonance filter circuit module is respectively connected with the tuning circuit module and a third live wire of the three-phase power supply and is used for carrying out harmonic filtering processing on the first phase current and the second phase current which are processed by the tuning circuit module and the third phase current input through the third live wire; and the rectifier circuit module is connected with the PI type resonance filter circuit module and is used for rectifying the first phase current, the second phase current and the third phase current processed by the PI type resonance filter circuit module to obtain direct current, outputting the direct current through a direct current output bus and supplying power to a load.
Optionally, the tuning circuit module includes: the power-on soft start device comprises a power-on soft start unit, a detection unit and a control unit; the power-on soft start unit is connected with the first live wire and the second live wire; the detection unit collects a voltage signal and a current signal on the direct current output bus; and the control unit is respectively connected with the power-on soft start unit and the detection unit and is used for controlling the power-on soft start unit to perform resonance adjustment processing according to the voltage signal and the current signal.
Optionally, the power-on soft start unit includes: the relay comprises a first relay, a second relay, a third relay and a resistance-inductance unit; the input end of the first relay is connected with the first live wire, and the output end of the first relay is connected with the PI type resonance filter circuit module; the second live wire is connected with the input end of the second relay, and the second live wire is connected with the input end of the third relay through the inductance-resistance unit; the output end of the second relay is connected with the output end of the third relay, and the connecting point is connected with the PI type resonance filter circuit module; the control unit is respectively connected with the control ends of the first relay, the second relay and the third relay and is used for controlling the first relay, the second relay and the third relay to be switched off or switched on.
Optionally, the detection unit includes: a current sampling circuit and a voltage sampling circuit; the control unit is respectively connected with the current sampling circuit and the voltage sampling circuit; the current sampling circuit is used for collecting a current signal on the direct current output bus; and the voltage sampling circuit is used for collecting voltage signals on the direct current output bus.
Optionally, the PI type resonant filtering circuit module includes: the common-mode inductor comprises a first reactor, a second reactor, a third reactor, a common-mode inductor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor and a ninth capacitor; the input end of the first reactor is connected with the third live wire, and the output end of the first reactor is connected with the first input end of the common-mode inductor through a first connecting wire; the input end of the second reactor is connected with the output end of the first relay, and the output end of the second reactor is connected with the second input end of the common-mode inductor through a second connecting line; the input end of the third reactor is connected with a connection point of the output end of the second relay and the output end of the third relay, and the output end of the third reactor is connected with the third input end of the common-mode inductor through a third connection line; two ends of the first capacitor are respectively connected with the first connecting line and the second connecting line, two ends of the second capacitor are respectively connected with the first connecting line and the third connecting line, and two ends of the third capacitor are respectively connected with the second connecting line and the third connecting line; first ends of the fourth capacitor, the fifth capacitor and the sixth capacitor are connected, and second ends of the fourth capacitor, the fifth capacitor and the sixth capacitor are respectively connected with the first connecting line, the second connecting line and the third connecting line; a fourth connecting line between the first output end of the common-mode inductor and the rectifier circuit module is connected with the first end of the seventh capacitor, a fifth connecting line between the second output end of the common-mode inductor and the rectifier circuit module is connected with the first end of the eighth capacitor, and a sixth connecting line between the third output end of the common-mode inductor and the rectifier circuit module is connected with the first end of the ninth capacitor; second ends of the seventh capacitor, the eighth capacitor and the ninth capacitor are connected, and the connection point is grounded.
Optionally, the rectifier circuit module comprises: a three-phase rectifier bridge and a capacitor assembly; three bridge arms of the three-phase rectifier bridge are respectively connected with the fourth connecting line, the fifth connecting line and the sixth connecting line; the first output end of the three-phase rectifier bridge is connected with the positive end of the direct-current output bus, and the second output end of the three-phase rectifier bridge is connected with the negative end of the direct-current output bus; and the capacitor assembly is connected in parallel with the first output end and the second output end of the three-phase rectifier bridge.
Optionally, the capacitive assembly comprises: a tenth capacitor, an eleventh capacitor, a twelfth capacitor and a thirteenth capacitor; the tenth capacitor and the twelfth capacitor are connected in series to form a first capacitor circuit, and two ends of the first capacitor circuit are respectively connected with the first output end and the second output end of the three-phase rectifier bridge; the eleventh capacitor and the thirteenth capacitor are connected in series to form a second capacitor circuit, and two ends of the second capacitor circuit are respectively connected with the first output end and the second output end of the three-phase rectifier bridge; wherein a connection between the tenth capacitance and the twelfth capacitance is connected with a connection between the eleventh capacitance and the thirteenth capacitance.
According to a second aspect of the present invention, there is provided a power supply device, comprising: a harmonic suppression apparatus as described above.
According to the utility model discloses a third aspect provides an electrical equipment, includes: a harmonic suppression apparatus as described above.
Optionally, the electrical device comprises: provided is a variable frequency air conditioner.
The utility model discloses a harmonic suppression device, power supply unit and electrical equipment make each phase current of three phase current pass through PI type adjustable resonance point filter circuit, can adjust input voltage, current phase place, matching impedance and many resonance points in real time, realize three phase current power factor correction, reactive power adjusts, makes the THD of the harmonic of each phase current satisfy the national standard requirement, and stand-by power consumption accords with the standard requirement; and the control is simple, the cost is low, and the reliability is high.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive laboriousness.
FIG. 1 is a schematic diagram of a prior art APFC circuit;
fig. 2 is a block schematic diagram of an embodiment of a harmonic suppression apparatus according to the present invention;
fig. 3 is a block schematic diagram of another embodiment of a harmonic suppression apparatus according to the present invention;
fig. 4 is a circuit schematic of an embodiment of a harmonic suppression apparatus according to the present invention;
fig. 5 is a schematic flow chart of an embodiment of a harmonic suppression method according to the present invention;
fig. 6 is a schematic control principle diagram of an embodiment of a harmonic suppression method based on the harmonic suppression apparatus of the present invention;
fig. 7 is a schematic diagram illustrating the effect of the harmonic suppression method according to the present invention.
Detailed Description
The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention. The technical solution of the present invention is described in many ways with reference to the drawings and the embodiments.
The terms "first", "second", and the like are used hereinafter only for descriptive distinction and have no other special meaning.
In one embodiment, as shown in fig. 2, the present invention provides a harmonic suppression device, which includes a tuning circuit module 10, a PI type resonance filter circuit module 20, and a rectifier circuit module 30. The tuned circuit module 10 is connected to a first live wire S and a second live wire T of the three-phase power supply 01, and performs resonance adjustment processing on a first phase current input through the first live wire S and a second phase current input through the second live wire T.
The PI type resonance filter circuit module 20 is connected to the tuning circuit module 10 and a third live wire R of the three-phase power supply 01, and performs harmonic filtering processing on the first phase current and the second phase current processed by the tuning circuit module 10 and the third phase current input through the third live wire R. The rectifier circuit module 30 is connected to the PI resonant filter circuit module 20, and rectifies the first phase current, the second phase current, and the third phase current processed by the PI resonant filter circuit module 20 to obtain a direct current, and outputs the direct current through the direct current output bus 50 to supply power to the load 40. The load 40 may be various, for example, the load 40 is an inverter part, an inverter motor of a compressor, and the like.
In one embodiment, as shown in fig. 3, the tuning circuit module includes a power-on soft start unit 11, a detection unit 13, and a control unit 12. The power-on soft start unit 11 is connected with a first live wire S and a second live wire T; the detection unit 13 collects a voltage signal and a current signal on the dc output bus 50. The control unit 12 is connected to the power-on soft start unit 11 and the detection unit 13, respectively, and controls the power-on soft start unit 11 to perform resonance adjustment processing according to the voltage signal and the current signal.
In one embodiment, as shown in fig. 4, the power-on soft start unit 11 includes: a first relay S1, a second relay S2, a third relay S3, and a resistance sensing unit RL. The input end of the first relay S1 is connected with the first live wire S, and the output end of the first relay S1 is connected with the PI type resonance filter circuit module. The second live line T is connected to an input terminal of the second relay S2, and the second live line T is connected to an input terminal of the third relay S3 through a resistive sensing unit RL, which may have various kinds of characteristics, such as resistance and inductance. The output end of the second relay S2 is connected with the output end of the third relay S3, and the connection point is connected with the PI type resonance filter circuit module.
The control unit 12 is connected to control terminals of the first, second and third relays S1, S2 and S3, respectively, for controlling the first, second and third relays S1, S2 and S3 to be opened or closed. The control unit 12 can be implemented in various ways, such as a digital signal processing DSP module, a single chip, etc.
The detection unit includes a current sampling circuit CM1 and a voltage sampling circuit VM 1. The current sampling circuit CM1 and the voltage sampling circuit VM1 may be implemented in various ways, for example, the current sampling circuit CM1 includes a current sensor or the like, and the voltage sampling circuit VM1 includes a voltage sensor or the like. The control unit 12 is connected with a current sampling circuit CM1 and a voltage sampling circuit VM1, respectively, the current sampling circuit CM1 collects current signals on the direct current output bus, and the voltage sampling circuit VM1 collects voltage signals on the direct current output bus.
By adjusting the inductance resistance module RL to control the amplitude and phase of the current, the control unit 12 can adjust the switching frequency of the three relays S1, S2, and S3 according to the load variation. In the case where the control unit 12 controls the first relay S1 to be closed, the second relay S2 to be open, and the third relay S3 to be closed, the three-phase power supply and the inductance block RL are made to form a closed loop, standby energy is consumed at the RL, and power consumption can be made less than 15W.
Two live wires S, T of a three-phase power supply are respectively connected in series with a power-on soft start unit 11 (a reactive power tuning soft start circuit), the power-on soft start unit 11 consists of a resistance-inductance module RL and three relays S1, S2 and S3, control ends g of the three relays S1, S2 and S3 are respectively connected with the control unit 12, a B, C end of the three-phase power supply is respectively connected with a PI type resonance filter circuit module (an inductor L2 and an inductor L3), reactive power regulation control of an LC resonance point is realized, and standby power consumption is less than 15W and the power-on soft start function is realized.
In one embodiment, the PI type resonant filter circuit module may be various, for example, as shown in fig. 4, the PI type resonant filter circuit module includes a first reactor L1, a second reactor L2, a third reactor L3, a common mode inductor L4, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, and a ninth capacitor C9.
The input end of the first reactor L1 is connected with the third live wire R, and the output end is connected with the first input end 1 of the common-mode inductor L4 through a first connecting wire 21; the input end of the second reactor L2 is connected with the output end of the first relay S1, and the output end is connected with the second input end 2 of the common mode inductor L4 through the second connection line 22; an input terminal of the third reactor L3 is connected to a connection point between the output terminal of the second relay S2 and the output terminal of the third relay S3, and an output terminal thereof is connected to the third input terminal 3 of the common mode inductor L4 via a third connection line 23.
Two ends of the first capacitor C1 are respectively connected with the first connecting line 21 and the second connecting line 22, two ends of the second capacitor C2 are respectively connected with the first connecting line 21 and the third connecting line 23, and two ends of the third capacitor C3 are respectively connected with the second connecting line 22 and the third connecting line 23. First ends of a fourth capacitor C4, a fifth capacitor C5 and a sixth capacitor C6 are connected, and second ends of the fourth capacitor C4, the fifth capacitor C5 and the sixth capacitor C6 are connected to the first connection line 21, the second connection line 22 and the third connection line 23, respectively.
A fourth connecting line 24 between the first output end 4 of the common-mode inductor L4 and the rectifier circuit module is connected with a first end of a seventh capacitor C7, a fifth connecting line 25 between the second output end 5 of the common-mode inductor L4 and the rectifier circuit module is connected with a first end of an eighth capacitor C8, and a sixth connecting line 26 between the third output end 6 of the common-mode inductor L4 and the rectifier circuit module is connected with a first end of a ninth capacitor C9; the second ends of the seventh capacitor C7, the eighth capacitor C8 and the ninth capacitor C9 are connected, and this connection point is grounded.
The connecting points of a live wire R, a first relay S1, a second relay S2 and a third relay of a three-phase power supply are directly connected in series with a PI type resonance filter circuit module, and the PI type resonance filter circuit module consists of three reactors L1\ L2\ L3, a common-mode inductor L4, capacitors C1\ C2\ C3, C4\ C5\ C6 and C7\ C8\ C9. The three reactors L1\ L2\ L3 can be the same reactor, and the capacitance values of the capacitors C1\ C2\ C3, C4\ C5\ C6, C7\ C8\ C9 can be all equal. The PI type resonance filter circuit module can realize PI type resonance, impedance matching and three-phase power factor correction. The PI type resonance filter circuit filters a power grid interference source, LC of the PI type resonance filter circuit resonates to present an impedance state, and 2-40 Harmonic interference is filtered, so that THD (Total Harmonic Distortion) of 2-40 Harmonic of each phase current is less than 5%, and the national standard requirement is met.
In one embodiment, the rectifier circuit module may be various. For example, as shown in fig. 4, the rectifier circuit module includes a three-phase rectifier bridge and a capacitor assembly; three bridge arms of the three-phase rectifier bridge are respectively connected with a fourth connecting line 24, a fifth connecting line 25 and a sixth connecting line 26; the first output end of the three-phase rectifier bridge is connected with the positive end of the direct-current output bus, and the second output end of the three-phase rectifier bridge is connected with the negative end of the direct-current output bus; the capacitor assembly is connected in parallel with the first output end and the second output end of the three-phase rectifier bridge.
The capacitance assembly comprises a tenth capacitance C10, an eleventh capacitance C11, a twelfth capacitance C12 and a thirteenth capacitance C13; the tenth capacitor C10 and the twelfth capacitor C12 are connected in series to form a first capacitor circuit, and two ends of the first capacitor circuit are respectively connected with the first output end and the second output end of the three-phase rectifier bridge; the eleventh capacitor C11 and the thirteenth capacitor C13 are connected in series to form a second capacitor circuit, and two ends of the second capacitor circuit are respectively connected with the first output end and the second output end of the three-phase rectifier bridge; wherein, the connecting line between the tenth capacitor C10 and the twelfth capacitor C12 is connected with the connecting line between the eleventh capacitor C11 and the thirteenth capacitor C12.
The three-phase rectifier bridge can be various, for example, six electrodes D1\ D2\ D3\ D4\ D5\ D6 form a three-phase uncontrollable rectifier bridge, and capacitors C10\ C11\ C12\ C14 form a capacitor assembly for filtering and shaping to meet the load operation. The three-phase rectifier bridge (composed of diodes D1\ D2\ D3\ D4\ D5\ D6) and the capacitor component (composed of capacitors C10\ C11\ C12\ C14) convert the alternating current AC into the direct current DC, so that the energy conversion and transmission of the power factor correction circuit are realized, and the power factor correction circuit is used by a load.
The harmonic suppression device in the embodiment realizes three-phase power supply power factor correction and reactive power regulation, so that the THD of 2-40 times of harmonic current of each phase current is less than 5%, the international harmonic standard requirement is met, and the standby power consumption requirement of less than 15W standard requirement can be met; compared with the conventional APFC scheme, the method has the advantages of lower cost, simple control and high reliability.
In one embodiment, the present invention provides a harmonic suppression method based on the harmonic suppression apparatus as in the above embodiments, implemented in a control unit; the load comprises a load motor. Fig. 5 is a schematic flow chart of an embodiment of a harmonic suppression method based on the harmonic suppression apparatus of the present invention, as shown in fig. 5:
step 501, calculating load frequency and harmonic suppression current according to voltage signals and power signals on the direct current output bus and parameters of a load motor.
In one embodiment, the control unit receives a voltage signal and a power supply signal on the direct current output bus, which are respectively collected by the voltage sampling circuit and the current sampling circuit. The parameters of the load motor comprise the pole pair number of the motor, the torque coefficient, the inductance and the current of a d axis and a q axis, the running frequency of the motor and the like.
Step 502, harmonic suppression processing is performed based on the load frequency and the harmonic suppression current.
The harmonic suppression processing may have various processing methods. For example, by controlling the control terminals g of the three relays, the resonance points are adjusted, and the power harmonic suppression current i 'is injected'qThe active power compensation is realized, and the power factor correction regulation is realized.
In one embodiment, the harmonic rejection current comprises a first shaft current; and acquiring the running frequency and the second shaft current of the load motor. The control unit collects the operating frequency and the second shaft current of the load motor when the load motor operates, and can adopt various existing collection methods to collect the operating frequency and the second shaft current.
And performing first comparison processing on the operating frequency and the load frequency, and determining a third axis current according to the result of the first comparison processing. For example, the third axis current is calculated using a first PI control algorithm based on the result of the first comparison process. The first axis current, the second axis current, and the third axis current may all be q-axis currents.
And performing second comparison processing on the sum result of the third shaft current and the first shaft current and the second shaft current, and determining the shaft voltage of the load motor according to the result of the second comparison processing. For example, the shaft voltage of the load motor is calculated using the second PI control algorithm according to the result of the second comparison process. The shaft voltage of the load motor includes a q-axis voltage.
As shown in fig. 6, the load motor is a permanent magnet synchronous motor PMSM, and the function inside the dashed line frame in fig. 6 can be implemented by the control unit of the present invention, or the control unit can also implement one or more functions outside the dashed line frame in fig. 6, for example, the control unit also includes an EMF calculation module and the like. The load comprises a load motor control means and the remaining functions not performed by the control unit may be performed by the load motor control means.
The utility model discloses a control unit calculates instantaneous power:
Figure BDA0002954019150000093
based on the calculation of the load frequency from the instantaneous power P1 as:
Figure BDA0002954019150000091
the first axis current is calculated as:
Figure BDA0002954019150000092
wherein n is the sampling frequency and can be obtained by a software counter; i (n) is the nth sampling current which is obtained by sampling by a current sampling circuit; u (n) is the nth sampling voltage and is obtained by sampling of a voltage sampling circuit; cos θ is the power coefficient.
p is the number of pole pairs of the load motor, ktIs the torque coefficient, LdAnd idIs d-axis inductance and current, LqAnd iqQ-axis inductance and current, and ω is the operating frequency of the load motor. L isd、Lq、id、iqThe inductance and current of d and q axes of a load motor respectively, wherein, P, kt、Ld、LqThe parameter can passThe motor specification of the load motor is obtained and stored in advance. i.e. id、iqFor acquiring d and q axis currents collected when the load motor runs, or obtaining i through a motor specification of the load motord、 iqAnd stored in advance. Omega is the motor running frequency, the actual running frequency of the load motor collected when the load motor runs.
As shown in fig. 6, ω*To load the predetermined frequency of the motor, ω can be used*Or omega' and omega are subjected to first comparison processing, and third axis current is calculated by utilizing a first PI control algorithm according to the result of the first comparison processing
Figure BDA0002954019150000104
The first comparison process is generally performed using ω' and ω. Applying a third axis current
Figure BDA0002954019150000102
And a primary shaft current i'qThe result of the summation with the second axis current iqPerforming a second comparison process, and calculating the shaft voltage u of the load motor by using a second PI control algorithm according to the result of the second comparison processq. Applying a fourth axis current
Figure BDA0002954019150000103
And fifth axis current idPerforming third comparison processing, and calculating the shaft voltage u of the load motor by using a third PI control algorithm according to the result of the third comparison processingd。
The first PI control algorithm, the second PI control algorithm, and the third PI control algorithm may be existing PI control algorithms including P (proportional) control and I (integral) control, and may be implemented in a software manner.
The u is paired by an I _ Park module and an SVPWM (Space Vector Pulse Width Modulation) moduleqAnd udAnd after I-Park conversion and SVPWM processing are sequentially carried out, the signals are sent to an IPM (Intelligent Power Module), and the IPM controls the PMSM. Collecting i of PMSMvAnd iwTo i, pairvAnd iwPerforming Clark processing and Park conversion processing; EMF (back EMF) calculation Module based on uq、ud、id、 iqThe value of ω is calculated. The I _ Park module, the SVPWM module, the Clark module, the Park module, the EMF calculation module, and the like may be implemented using existing algorithms and methods to perform corresponding functions.
In one embodiment, the first relay, the second relay and the third relay are controlled to be opened or closed for resonance adjustment. And under the condition that the running frequency of the load motor is 0, controlling the first relay, the second relay and the third relay to be switched off.
Calculating instantaneous power P1, and calculating load frequency omega' according to the instantaneous power P1; after the load frequency is stable, the R and L values of the inductance resistance module are adjusted and the resonance point is adjusted by controlling the control ends g of the second relay and the third relay, so that the circuit resonates and presents impedance. Calculating a first shaft current i 'after the resonance point is adjusted and stabilized'q(harmonic suppression current) was injected into i'qCurrent, i.e. injected into vector control diagram of load motorqA shaft that reduces a rectifier bridge diode conduction angle β; the rectifier bridge diode may be a rectifier bridge diode of the inverter component, or may be a diode in a three-phase rectifier bridge of the rectifier circuit module, and the conduction angle β of the diode may be adjusted by using an existing method, so that the current waveform can follow the input voltage waveform of the power grid power supply to approach a sine wave, as shown in fig. 7, which is a voltage waveform displayed on a screen of an oscilloscope or the like.
The harmonic suppression device and the harmonic suppression method in the embodiment enable each phase current of the three-phase power supply to pass through the PI type tunable resonance point filter circuit, so that the input voltage, the current phase, the matching impedance and the multiple resonance points can be adjusted in real time, the three-phase power supply power factor correction and the reactive power adjustment are realized, the THD of 2-40 times of harmonic waves of each phase current is less than 5%, the national standard requirement is met, the standby power consumption is less than 15W, and the standard requirement is met; the control is simple, the cost is low, and the reliability is high.
In one embodiment, the present invention provides a power supply apparatus comprising a harmonic suppression apparatus as in the above embodiments. The power supply device is a three-phase power supply device and the like.
In one embodiment, the present invention provides an electrical apparatus comprising a harmonic suppression device as in the above embodiments. The electrical equipment can be various, such as a variable frequency air conditioner and the like.
The harmonic suppression device, the power supply device and the electrical equipment provided by the embodiment enable each phase current of the three-phase power supply to pass through the PI type adjustable resonance point filter circuit, so that the input voltage, the current phase, the matching impedance and the multiple resonance points can be adjusted in real time, the three-phase power supply power factor correction and the reactive power adjustment are realized, the THD of 2-40 times of harmonic of each phase current is less than 5%, the national standard requirement is met, the standby power consumption is less than 15W, and the standard requirement is met; the control is simple, the cost is low, the reliability is high, and the cost is reduced by at least 200 yuan compared with the conventional APFC scheme.
The method and system of the present invention may be implemented in a number of ways. For example, the methods and systems of the present invention may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order for the steps of the method is for illustrative purposes only, and the steps of the method of the present invention are not limited to the order specifically described above unless specifically stated otherwise. Furthermore, in some embodiments, the present invention may also be embodied as programs recorded in a recording medium, the programs including machine readable instructions for implementing a method according to the present invention. Thus, the present invention also covers a recording medium storing a program for executing the method according to the present invention.
The description of the present invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.

Claims (10)

1. A harmonic suppression apparatus, comprising:
the tuning circuit module is connected with a first live wire and a second live wire of a three-phase power supply and used for carrying out resonance adjustment processing on a first phase current input through the first live wire and a second phase current input through the second live wire;
the PI type resonance filter circuit module is respectively connected with the tuning circuit module and a third live wire of the three-phase power supply and is used for carrying out harmonic filtering processing on the first phase current and the second phase current which are processed by the tuning circuit module and the third phase current input through the third live wire;
and the rectifier circuit module is connected with the PI type resonance filter circuit module and is used for rectifying the first phase current, the second phase current and the third phase current processed by the PI type resonance filter circuit module to obtain direct current, outputting the direct current through a direct current output bus and supplying power to a load.
2. The apparatus of claim 1, wherein the tuning circuit module comprises: the power-on soft start device comprises a power-on soft start unit, a detection unit and a control unit;
the power-on soft start unit is connected with the first live wire and the second live wire; the detection unit collects a voltage signal and a current signal on the direct current output bus;
and the control unit is respectively connected with the power-on soft start unit and the detection unit and is used for controlling the power-on soft start unit to perform resonance adjustment processing according to the voltage signal and the current signal.
3. The apparatus of claim 2, wherein the power-on soft start unit comprises: the relay comprises a first relay, a second relay, a third relay and a resistance-inductance unit;
the input end of the first relay is connected with the first live wire, and the output end of the first relay is connected with the PI type resonance filter circuit module;
the second live wire is connected with the input end of the second relay, and the second live wire is connected with the input end of the third relay through the inductance-resistance unit; the output end of the second relay is connected with the output end of the third relay, and the connecting point is connected with the PI type resonance filter circuit module;
the control unit is respectively connected with the control ends of the first relay, the second relay and the third relay and is used for controlling the first relay, the second relay and the third relay to be switched off or switched on.
4. The apparatus of claim 3, wherein the detection unit comprises: a current sampling circuit and a voltage sampling circuit; the control unit is respectively connected with the current sampling circuit and the voltage sampling circuit;
the current sampling circuit is used for collecting a current signal on the direct current output bus;
and the voltage sampling circuit is used for collecting voltage signals on the direct current output bus.
5. The apparatus of claim 3, wherein the PI-type resonant filter circuit module comprises: the common-mode inductor comprises a first reactor, a second reactor, a third reactor, a common-mode inductor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor and a ninth capacitor;
the input end of the first reactor is connected with the third live wire, and the output end of the first reactor is connected with the first input end of the common-mode inductor through a first connecting wire; the input end of the second reactor is connected with the output end of the first relay, and the output end of the second reactor is connected with the second input end of the common-mode inductor through a second connecting line; the input end of the third reactor is connected with a connection point of the output end of the second relay and the output end of the third relay, and the output end of the third reactor is connected with the third input end of the common-mode inductor through a third connection line;
two ends of the first capacitor are respectively connected with the first connecting line and the second connecting line, two ends of the second capacitor are respectively connected with the first connecting line and the third connecting line, and two ends of the third capacitor are respectively connected with the second connecting line and the third connecting line; first ends of the fourth capacitor, the fifth capacitor and the sixth capacitor are connected, and second ends of the fourth capacitor, the fifth capacitor and the sixth capacitor are respectively connected with the first connecting line, the second connecting line and the third connecting line;
a fourth connecting line between the first output end of the common-mode inductor and the rectifier circuit module is connected with the first end of the seventh capacitor, a fifth connecting line between the second output end of the common-mode inductor and the rectifier circuit module is connected with the first end of the eighth capacitor, and a sixth connecting line between the third output end of the common-mode inductor and the rectifier circuit module is connected with the first end of the ninth capacitor; second ends of the seventh capacitor, the eighth capacitor and the ninth capacitor are connected, and the connection point is grounded.
6. The apparatus of claim 5, wherein the rectifier circuit module comprises: a three-phase rectifier bridge and a capacitor assembly;
three bridge arms of the three-phase rectifier bridge are respectively connected with the fourth connecting line, the fifth connecting line and the sixth connecting line; the first output end of the three-phase rectifier bridge is connected with the positive end of the direct-current output bus, and the second output end of the three-phase rectifier bridge is connected with the negative end of the direct-current output bus; and the capacitor assembly is connected in parallel with the first output end and the second output end of the three-phase rectifier bridge.
7. The apparatus of claim 6, wherein the capacitive component comprises: a tenth capacitor, an eleventh capacitor, a twelfth capacitor and a thirteenth capacitor;
the tenth capacitor and the twelfth capacitor are connected in series to form a first capacitor circuit, and two ends of the first capacitor circuit are respectively connected with the first output end and the second output end of the three-phase rectifier bridge; the eleventh capacitor and the thirteenth capacitor are connected in series to form a second capacitor circuit, and two ends of the second capacitor circuit are respectively connected with the first output end and the second output end of the three-phase rectifier bridge; wherein a connection between the tenth capacitance and the twelfth capacitance is connected with a connection between the eleventh capacitance and the thirteenth capacitance.
8. A power supply device, comprising:
the harmonic suppression apparatus as claimed in any one of claims 1 to 7.
9. An electrical device, comprising:
the harmonic suppression apparatus as claimed in any one of claims 1 to 7.
10. The electrical device of claim 9,
the electrical apparatus includes: provided is a variable frequency air conditioner.
CN202120433804.6U 2021-02-26 2021-02-26 Harmonic suppression device, power supply device, and electric appliance Active CN214314575U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022179141A1 (en) * 2021-02-26 2022-09-01 珠海格力电器股份有限公司 Harmonic suppression apparatus and method, control unit, electrical appliance, and storage medium

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022179141A1 (en) * 2021-02-26 2022-09-01 珠海格力电器股份有限公司 Harmonic suppression apparatus and method, control unit, electrical appliance, and storage medium

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