CN110011294B - Voltage compensation circuit, control method thereof and air conditioner driving system - Google Patents
Voltage compensation circuit, control method thereof and air conditioner driving system Download PDFInfo
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- CN110011294B CN110011294B CN201910366669.5A CN201910366669A CN110011294B CN 110011294 B CN110011294 B CN 110011294B CN 201910366669 A CN201910366669 A CN 201910366669A CN 110011294 B CN110011294 B CN 110011294B
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- 238000004590 computer program Methods 0.000 claims description 4
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- 239000004065 semiconductor Substances 0.000 claims description 4
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/02—Arrangements for reducing harmonics or ripples
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Abstract
The disclosure provides a voltage compensation circuit, a control method thereof and an air conditioner driving system, and relates to the field of control. The voltage compensation circuit absorbs ripple power input by a power grid when the power grid side rectifier bridge is conducted, improves input current waveforms, compensates direct current bus voltage when the power grid side rectifier bridge is cut off, and reduces fluctuation of the direct current bus voltage. Thus, the power supply performance is ultimately improved.
Description
Technical Field
The disclosure relates to the field of control, and in particular relates to a voltage compensation circuit, a control method thereof and an air conditioner driving system.
Background
In an air conditioner driving system, some enterprises set electrolytic capacitors on a direct current bus. The electrolytic capacitor has large capacity and more energy storage, can be used as an energy buffer to absorb ripple power input by a power grid, and can enable the voltage of the direct current bus to be relatively stable. However, the electrolytic capacitor is expensive and has a low lifetime, so that the cost of the air conditioner driving system is increased and the reliability is lowered.
Disclosure of Invention
The inventor has found that if the electrolytic capacitor on the dc bus is replaced by a longer-life, lower-cost thin film capacitor, new problems are introduced, although it is advantageous for the cost reduction and reliability improvement of the air conditioner driving system. Because the capacity of the film capacitor is small, the energy storage is less, the ripple power input by the power grid is directly transmitted to the compressor of the air conditioner, the output torque can fluctuate, and the fluctuation of the voltage of the direct current bus can be larger.
In view of this, for the air conditioner driving system without electrolytic capacitor on the dc bus, a voltage compensation circuit of the dc bus is proposed, which absorbs the ripple power input by the power grid when the grid-side rectifier bridge is turned on, improves the input current waveform, compensates the dc bus voltage when the grid-side rectifier bridge is turned off, reduces the fluctuation of the dc bus voltage, and finally improves the power supply performance.
Some embodiments of the present disclosure propose a voltage compensation circuit comprising:
The positive electrode of the energy storage capacitor is connected with the collector electrode of the first switch, and the negative electrode of the energy storage capacitor is connected with the emitter electrode of the second switch;
The emitter of the first switch is connected with the collector of the second switch and the inductor;
The diode is connected with the first switch in anti-parallel;
The collector of the second switch is connected with the inductor, and the emitter of the second switch is connected with the negative electrode of the direct current bus capacitor;
And
One end of the inductor is connected with the emitter of the first switch and the collector of the second switch, and the other end of the inductor is connected with the anode of the direct current bus capacitor.
In some embodiments, the first switch and the second switch are insulated gate bipolar transistors or metal oxide semiconductor field effect transistors.
Some embodiments of the present disclosure provide an air conditioner driving system, an air conditioner connecting direct current bus, comprising:
A direct current bus capacitor;
And
The voltage compensation circuit.
In some embodiments, an inverter is provided on the connection between the air conditioner and the dc bus.
In some embodiments, the dc bus capacitance comprises a thin film capacitance.
In some embodiments, the air conditioner driving system further includes: and a control device for controlling the conduction state of the first switch and the second switch.
Some embodiments of the present disclosure provide a control method of a voltage compensation circuit, including:
calculating the compensation quantity of the input current of the power grid according to the reference value of the input current of the power grid and the reference value of the input current of the air conditioner;
Calculating an output current reference value of the voltage compensation circuit according to the compensation quantity of the input current of the power grid, the output current reference value of the energy storage capacitor and the output current reference value of the direct current bus capacitor;
calculating an output voltage reference value of the voltage compensation circuit according to the output current reference value and the output current actual value of the voltage compensation circuit;
according to the conducting state of the grid-side rectifier bridge and in combination with the output voltage reference value of the voltage compensation circuit, the conducting states of the first switch and the second switch are controlled, so that the power grid charges the energy storage capacitor when the rectifier bridge is conducted and the energy storage capacitor charges the direct-current bus capacitor when the rectifier bridge is cut off.
In some embodiments, the controlling the conduction state of the first switch and the second switch includes:
under the condition that the rectifier bridge is conducted, the first switch is controlled to be turned off so that the power grid charges the energy storage capacitor, and when the output voltage reference value of the voltage compensation circuit is larger than the set first conducting voltage, the second switch is controlled to be conducted so as to finish the charging process of the energy storage capacitor;
And under the condition that the rectifier bridge is cut off, the second switch is controlled to be turned off, and when the output voltage reference value of the voltage compensation circuit is larger than the set second conduction voltage, the first switch is controlled to be turned on, so that the energy storage capacitor charges the direct current bus capacitor.
In some embodiments, the reference value of the grid input current minus the reference value of the air conditioner input current is a compensation amount of the grid input current,
The reference value of the input current of the power grid is determined according to the quotient of the input power of the power grid and the voltage reference value of the direct current bus capacitor, and the reference value of the input current of the air conditioner is determined according to the quotient of the input power of the compressor and the voltage reference value of the direct current bus capacitor.
In some embodiments, the output current reference value of the voltage compensation circuit is obtained by subtracting the output current reference value of the energy storage capacitor and the compensation amount of the input current of the power grid from the output current reference value of the direct current bus capacitor,
The output current reference value of the direct current bus capacitor is obtained by inputting the difference value between the voltage reference value of the direct current bus capacitor and the voltage into the proportional-integral controller, and the output current reference value of the energy storage capacitor is obtained by inputting the difference value between the voltage reference value of the energy storage capacitor and the voltage into the proportional-integral controller.
In some embodiments, the difference between the output current reference value and the output current actual value of the voltage compensation circuit is input to a proportional-integral controller to obtain the output voltage reference value of the voltage compensation circuit.
Some embodiments of the present disclosure provide a control device of a voltage compensation circuit, including:
the power grid current controller is configured to calculate the compensation quantity of the power grid input current according to the reference value of the power grid input current and the reference value of the air conditioner input current;
A compensation circuit current calculator configured to calculate an output current reference value of the voltage compensation circuit according to a compensation amount of the grid input current, an output current reference value of the energy storage capacitor, and an output current reference value of the direct current bus capacitor;
A current loop controller configured to calculate an output voltage reference value of the voltage compensation circuit based on the output current reference value and the output current actual value of the voltage compensation circuit;
and the switch controller is configured to control the conducting states of the first switch and the second switch according to the conducting state of the grid-side rectifier bridge and in combination with the output voltage reference value of the voltage compensation circuit, so that the power grid charges the energy storage capacitor when the rectifier bridge is conducted and the energy storage capacitor charges the direct-current bus capacitor when the rectifier bridge is cut off.
In some embodiments, further comprising:
The direct current bus capacitor voltage controller is configured to perform proportional integral operation on the difference between the voltage reference value of the direct current bus capacitor and the voltage to obtain an output current reference value of the direct current bus capacitor;
and the energy storage capacitor voltage controller is configured to perform proportional integral operation on the voltage reference value of the energy storage capacitor and the difference value between the voltages to obtain an output current reference value of the energy storage capacitor.
Some embodiments of the present disclosure provide a control device of a voltage compensation circuit, including:
a memory; and
A processor coupled to the memory, the processor configured to execute the control method of the voltage compensation circuit in any of the foregoing embodiments based on instructions stored in the memory.
Some embodiments of the present disclosure propose a computer-readable storage medium, on which a computer program is stored, which when executed by a processor implements the control method of the voltage compensation circuit in any of the foregoing embodiments.
Drawings
The drawings that are required for use in the description of the embodiments or the related art will be briefly described below. The present disclosure will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings,
It will be apparent to those of ordinary skill in the art that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived from them without inventive faculty.
Fig. 1 is a schematic diagram of some embodiments of an air conditioner driving system with a voltage compensation circuit of the present disclosure.
Fig. 2 shows a power flow schematic of the air conditioner driving system when the grid-side rectifier bridge 13 of the present disclosure is turned on.
Fig. 3 shows a power flow schematic of the air conditioner driving system when the grid-side rectifier bridge 13 of the present disclosure is turned off.
Fig. 4 is a flowchart illustrating a control method of the voltage compensation circuit according to some embodiments of the disclosure.
Fig. 5 is a schematic diagram of some embodiments of a control device of the voltage compensation circuit of the present disclosure.
Fig. 6 is a schematic diagram of some embodiments of a control device of the voltage compensation circuit of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure.
Fig. 1 is a schematic diagram of some embodiments of an air conditioner driving system with a voltage compensation circuit of the present disclosure.
As shown in fig. 1, the air conditioner driving system 10 of this embodiment includes: a dc bus capacitor C dc1 located on the dc bus, and a voltage compensation circuit 11 that compensates the dc bus voltage (more precisely, compensates the dc bus capacitor voltage). The dc bus capacitor is a capacitor with a small capacity such as a thin film capacitor and less energy storage. The air conditioner is connected to the direct current bus, more precisely, the compressor of the air conditioner is connected to the direct current bus. In addition, an inverter 12 may be provided on the connection line between the air conditioner and the dc bus. The inverter is capable of converting direct current into alternating current. The inverter may be composed of an inverter bridge, control logic, a filter circuit, and the like, for example. Furthermore, the grid (generating alternating current) is connected to a direct current bus via a rectifier bridge 13. The rectifier bridge is formed by connecting four diodes together in a certain connection mode. A filter inductance L in can be arranged between the power grid and the rectifier bridge 13. In some embodiments, the air conditioner driving system 10 further includes: control means 50, 60 (shown in fig. 5 and 6) for controlling the on-state of the first switch and the second switch.
The voltage compensation circuit 11 is described below with emphasis on the portion shown by the dotted line box in fig. 1.
The voltage compensation circuit 11 includes: the capacitor C dc2, the first switch S 1, the diode D, the second switch S 2, and the inductor L. The positive electrode of the energy storage capacitor C dc2 is connected with the collector electrode of the first switch S 1, and the negative electrode of the energy storage capacitor C dc2 is connected with the emitter electrode of the second switch S 2; the emitter of the first switch S 1 is connected with the collector of the second switch S 2 and the inductor; the diode D is reversely connected with the first switch S 1 in parallel; the collector of the second switch S 2 is connected with the inductor, and the emitter is connected with the cathode of the direct-current bus capacitor C dc1; one end of the inductor L is connected with the emitter of the first switch S 1 and the collector of the second switch S 2, and the other end of the inductor L is connected with the anode of the direct-current bus capacitor C dc1.
The first switch and the second switch are semiconductor switches such as insulated gate bipolar transistors (Insulated Gate Bipolar Transistor, IGBT) or Metal-Oxide-semiconductor field effect transistors (MOSFET) and the like so as to realize the switching function of higher frequency in cooperation with a power grid.
In addition, fig. 1 also shows the voltage v dc1 across the dc bus capacitor C dc1, and the voltage v dc2 across the storage capacitor C dc2.
The voltage compensation circuit 11 charges the energy storage capacitor C dc2 by the power grid when the grid-side rectifier bridge 13 is conducted, absorbs ripple power input by the power grid through the inductor L and the energy storage capacitor C dc2, and improves input current waveforms; when the grid-side rectifier bridge 13 is cut off, when the direct-current bus capacitor C dc1 discharges to a certain extent, the energy storage capacitor C dc2 charges the direct-current bus capacitor C dc1, namely the energy storage capacitor C dc2 compensates the direct-current bus voltage, and fluctuation of the direct-current bus voltage is reduced. Thus, the overall power supply performance is finally improved.
Fig. 2 shows a schematic power flow diagram of the air conditioning system when the grid-side rectifier bridge 13 is on. Fig. 3 shows a schematic power flow diagram of the air conditioning system when the grid-side rectifier bridge 13 is switched off. Where P g represents grid input power, and P inv represents air conditioner (compressor) input power.
Fig. 4 is a flowchart illustrating a control method of the voltage compensation circuit according to some embodiments of the disclosure.
As shown in fig. 4, the control method of the voltage compensation circuit of this embodiment includes:
step 41, calculating the compensation quantity of the input current of the power grid according to the reference value of the input current of the power grid and the reference value of the input current of the air conditioner (compressor).
In some embodiments, the reference value of the grid input current minus the reference value of the air conditioner input current is a compensation amount of the grid input current. The formula is as follows:
wherein, Reference value representing grid input current,/>A reference value indicating an input current of an air conditioner (compressor), i comp indicates a compensation amount for calculating an input current of a power grid.
I comp can regulate the power fluctuation between the power supply side and the air conditioner (compressor) so that the grid input current i g always follows the reference current thereof
In some embodiments, the reference value of the grid input current when the rectifier bridge is onAccording to the input power P g of the power grid and the voltage reference value/>, of the set direct-current bus capacitorIs determined by the quotient of (2). The formula is as follows:
When |V g|sinθg＜Vdc1_min, the rectifier bridge is cut off, at this time Where θ g and |v g | represent the phase angle and magnitude of the grid, respectively. θ g and |v g | can be obtained using the voltage across C dc1 and by phase-locked loop techniques. V dc1_min denotes a minimum voltage value to which the dc bus capacitor C dc1 discharges.
In some embodiments, a reference value of the air conditioner input currentAccording to the input power P inv of the air conditioner (compressor) and the voltage reference value/>, of the direct current bus capacitorIs determined by the quotient of (2). The formula is as follows:
Some exemplary calculation methods of P inv and P g are described below.
Pinv＝3uinviinv
Where u inv and i inv represent the voltage and current of the air conditioner (compressor), respectively, which can be obtained by sampling.
Wherein P dc1 represents the output power of the dc bus capacitor C dc1, C dc1 also represents the capacitance value of the dc bus capacitor in the above formula, and v dc1 represents the voltage across the dc bus capacitor C dc1. The meaning of the other symbols is referred to above.
Step 42, calculating an output current reference value of the voltage compensation circuit according to the compensation amount of the input current of the power grid, the output current reference value of the energy storage capacitor and the output current reference value of the direct current bus capacitor.
In some embodiments, the output current reference value of DC bus capacitance C dc1 Subtracting the output current reference value/>, of the energy storage capacitor C dc2 And the compensation quantity i comp of the input current of the power grid to obtain the output current reference value/>, of the voltage compensation circuitThe formula is as follows:
The following description will be given of And/>Is described.
In some embodiments, the output current reference value of the DC bus capacitanceBy referencing the voltage reference value of the DC bus capacitance/>The difference between the voltage v dc1 and the voltage v dc1 is input into a proportional-integral controller.
The proportional-integral controller performs proportional-integral operation on the input information, k p1 represents a proportional term coefficient, k i1 represents an integral term coefficient, and 1/s represents integral operation.
In some embodiments, the output current reference of the storage capacitorBy referencing the voltage of the storage capacitor toThe difference between the voltage v dc2 and the voltage v dc2 is input into a proportional-integral controller.
Similarly, k p2 represents a proportional term coefficient, k i2 represents an integral term coefficient, and 1/s represents an integral operation.The value of (2) is a fixed constant, which is greater than/>
Step 43, calculating the output voltage reference value of the voltage compensation circuit according to the output current reference value and the output current buying-in value of the voltage compensation circuit.
In some embodiments, the output current of the voltage compensation circuit is referenced toThe difference value between the output current actual value i L and the output current actual value i L is input into a proportional integral controller to obtain an output voltage reference value/>, of the voltage compensation circuitThe proportional-integral operation by the proportional-integral controller refers to the foregoing, and the values of the proportional term coefficient and the integral term coefficient may be different from the foregoing proportional-integral controller.
And step 44, outputting control signals of the first switch and the second switch according to the conducting state of the grid-side rectifier bridge and combining an output voltage reference value of the voltage compensation circuit, and controlling the conducting state of the first switch and the second switch so as to charge the energy storage capacitor by the grid when the rectifier bridge is conducted and charge the direct-current bus capacitor by the energy storage capacitor when the rectifier bridge is cut off.
Specifically, controlling the conduction states of the first switch and the second switch includes:
Step 44a, in case the rectifier bridge is turned on, controls the first switch to be turned off, so that the power grid charges the energy storage capacitor, at this time, Then/>And then calculates the output voltage reference value/>, of the voltage compensation circuitWhen the output voltage reference value/>, of the voltage compensation circuitWhen the voltage is larger than the set first conduction voltage V 1on, the second switch is controlled to be conducted so as to finish the charging process of the energy storage capacitor and prevent the voltage at two ends of the energy storage capacitor from being too high. When/>And when the voltage is smaller than the set first turn-off voltage V 1off, the second switch is controlled to be turned off.
In step 44b, in case the rectifier bridge is turned off, the second switch is controlled to be turned off all the time, at this time,ThenAnd then calculates the output voltage reference value/>, of the voltage compensation circuitWhen the output voltage reference value/>, of the voltage compensation circuitWhen the voltage is larger than the set second conduction voltage V 2on, the first switch is controlled to be conducted, so that the energy storage capacitor charges the direct current bus capacitor, and the direct current bus is compensated. When/>And when the voltage is smaller than the set second turn-off voltage V 2off, the first switch is controlled to be turned off.
By controlling the voltage compensation circuit 11, when the grid-side rectifier bridge 13 is conducted, the power grid charges the energy storage capacitor C dc2, the voltage at two ends of the energy storage capacitor can be prevented from being too high, the ripple power input by the power grid is absorbed through the inductor L and the energy storage capacitor C dc2 in the charging process, and the input current waveform is improved; when the grid-side rectifier bridge 13 is cut off, when the direct-current bus capacitor C dc1 discharges to a certain extent, the energy storage capacitor C dc2 charges the direct-current bus capacitor C dc1, namely the energy storage capacitor C dc2 compensates the direct-current bus voltage, and fluctuation of the direct-current bus voltage is reduced. Thus, the overall power supply performance is finally improved.
Fig. 5 is a schematic diagram of some embodiments of a control device of the voltage compensation circuit of the present disclosure.
As shown in fig. 5, the control device 50 of the voltage compensation circuit of this embodiment includes:
the grid current controller 51 is configured to calculate a compensation amount of the grid input current according to the reference value of the grid input current and the reference value of the air conditioner input current.
And a compensation circuit current calculator 52 configured to calculate an output current reference value of the voltage compensation circuit based on the compensation amount of the grid input current, the output current reference value of the energy storage capacitor, and the output current reference value of the dc bus capacitor.
And a current loop controller 53 configured to calculate an output voltage reference value of the voltage compensation circuit from the output current reference value and the output current actual value of the voltage compensation circuit.
The switch controller 54 is configured to output control signals of the first switch and the second switch according to the conducting state of the grid-side rectifier bridge and in combination with the output voltage reference value of the voltage compensation circuit, so as to control the conducting states of the first switch and the second switch, and enable the grid to charge the energy storage capacitor when the rectifier bridge is conducted and enable the energy storage capacitor to charge the direct current bus capacitor when the rectifier bridge is cut off.
In some embodiments, the control device 50 further comprises:
And the direct current bus capacitor voltage controller 55 is configured to perform proportional integral operation on the difference between the voltage reference value and the voltage of the direct current bus capacitor to obtain an output current reference value of the direct current bus capacitor.
The energy storage capacitor voltage controller 56 is configured to perform a proportional-integral operation on a difference between the voltage reference value and the voltage of the energy storage capacitor to obtain an output current reference value of the energy storage capacitor.
In some embodiments, the current loop controller 53, the dc bus capacitor voltage controller 55, and the storage capacitor voltage controller 56 may be, for example, proportional-integral controllers.
It can be appreciated that the specific calculation method related to each module is referred to the foregoing, and will not be repeated herein.
Fig. 6 is a schematic diagram of some embodiments of a control device of the voltage compensation circuit of the present disclosure.
As shown in fig. 6, the control device 60 of the voltage compensation circuit of this embodiment includes: a memory 61; and a processor 62 coupled to the memory. The processor 62 is configured to execute the control method of the voltage compensation circuit in any of the foregoing embodiments based on instructions stored in the memory.
The memory 61 may include, for example, a system memory, a fixed nonvolatile storage medium, and the like. The system memory stores, for example, an operating system, application programs, boot Loader (Boot Loader), and other programs.
It will be appreciated by those skilled in the art that embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
The foregoing description of the preferred embodiments of the present disclosure is not intended to limit the disclosure, but rather to enable any modification, equivalent replacement, improvement or the like, which fall within the spirit and principles of the present disclosure.
Claims (11)
1. A control method of a voltage compensation circuit is characterized in that,
The voltage compensation circuit includes: the positive electrode of the energy storage capacitor is connected with the collector electrode of the first switch, and the negative electrode of the energy storage capacitor is connected with the emitter electrode of the second switch; the emitter of the first switch is connected with the collector of the second switch and the inductor; the diode is connected with the first switch in anti-parallel; the collector of the second switch is connected with the inductor, and the emitter of the second switch is connected with the negative electrode of the direct current bus capacitor; one end of the inductor is connected with the emitter of the first switch and the collector of the second switch, and the other end of the inductor is connected with the anode of the direct current bus capacitor;
The control method of the voltage compensation circuit comprises the following steps:
calculating the compensation quantity of the input current of the power grid according to the reference value of the input current of the power grid and the reference value of the input current of the air conditioner;
Calculating an output current reference value of the voltage compensation circuit according to the compensation quantity of the input current of the power grid, the output current reference value of the energy storage capacitor and the output current reference value of the direct current bus capacitor;
calculating an output voltage reference value of the voltage compensation circuit according to the output current reference value and the output current actual value of the voltage compensation circuit;
according to the conducting state of the grid-side rectifier bridge and in combination with the output voltage reference value of the voltage compensation circuit, the conducting states of the first switch and the second switch are controlled, so that the power grid charges the energy storage capacitor when the rectifier bridge is conducted and the energy storage capacitor charges the direct-current bus capacitor when the rectifier bridge is cut off.
2. The control method of claim 1, wherein controlling the conduction states of the first switch and the second switch comprises:
under the condition that the rectifier bridge is conducted, the first switch is controlled to be turned off so that the power grid charges the energy storage capacitor, and when the output voltage reference value of the voltage compensation circuit is larger than the set first conducting voltage, the second switch is controlled to be conducted so as to finish the charging process of the energy storage capacitor;
And under the condition that the rectifier bridge is cut off, the second switch is controlled to be turned off, and when the output voltage reference value of the voltage compensation circuit is larger than the set second conduction voltage, the first switch is controlled to be turned on, so that the energy storage capacitor charges the direct current bus capacitor.
3. The control method according to claim 1, wherein,
The reference value of the grid input current is subtracted by the reference value of the air conditioner input current,
The reference value of the input current of the power grid is determined according to the quotient of the input power of the power grid and the voltage reference value of the direct current bus capacitor, and the reference value of the input current of the air conditioner is determined according to the quotient of the input power of the compressor and the voltage reference value of the direct current bus capacitor.
4. The control method according to claim 1, wherein,
The output current reference value of the voltage compensation circuit is obtained by subtracting the output current reference value of the energy storage capacitor and the compensation quantity of the input current of the power grid from the output current reference value of the direct current bus capacitor,
The output current reference value of the direct current bus capacitor is obtained by inputting the difference value between the voltage reference value of the direct current bus capacitor and the voltage into the proportional-integral controller, and the output current reference value of the energy storage capacitor is obtained by inputting the difference value between the voltage reference value of the energy storage capacitor and the voltage into the proportional-integral controller.
5. The control method according to claim 1, wherein,
And inputting the difference value between the output current reference value and the output current actual value of the voltage compensation circuit into a proportional-integral controller to obtain the output voltage reference value of the voltage compensation circuit.
6. The control method of claim 1, wherein the first switch and the second switch are insulated gate bipolar transistors or metal oxide semiconductor field effect transistors.
7. The control method according to claim 1, wherein,
An inverter is arranged on a connecting line between the air conditioner and the direct current bus;
Or the dc bus capacitance may comprise a thin film capacitance.
8. A control device of a voltage compensation circuit is characterized in that,
The voltage compensation circuit includes: the positive electrode of the energy storage capacitor is connected with the collector electrode of the first switch, and the negative electrode of the energy storage capacitor is connected with the emitter electrode of the second switch; the emitter of the first switch is connected with the collector of the second switch and the inductor; the diode is connected with the first switch in anti-parallel; the collector of the second switch is connected with the inductor, and the emitter of the second switch is connected with the negative electrode of the direct current bus capacitor; one end of the inductor is connected with the emitter of the first switch and the collector of the second switch, and the other end of the inductor is connected with the anode of the direct current bus capacitor;
The control device of the voltage compensation circuit comprises:
the power grid current controller is configured to calculate the compensation quantity of the power grid input current according to the reference value of the power grid input current and the reference value of the air conditioner input current;
A compensation circuit current calculator configured to calculate an output current reference value of the voltage compensation circuit according to a compensation amount of the grid input current, an output current reference value of the energy storage capacitor, and an output current reference value of the direct current bus capacitor;
A current loop controller configured to calculate an output voltage reference value of the voltage compensation circuit based on the output current reference value and the output current actual value of the voltage compensation circuit;
and the switch controller is configured to control the conducting states of the first switch and the second switch according to the conducting state of the grid-side rectifier bridge and in combination with the output voltage reference value of the voltage compensation circuit, so that the power grid charges the energy storage capacitor when the rectifier bridge is conducted and the energy storage capacitor charges the direct-current bus capacitor when the rectifier bridge is cut off.
9. The control device according to claim 8, characterized by further comprising:
The direct current bus capacitor voltage controller is configured to perform proportional integral operation on the difference between the voltage reference value of the direct current bus capacitor and the voltage to obtain an output current reference value of the direct current bus capacitor;
and the energy storage capacitor voltage controller is configured to perform proportional integral operation on the voltage reference value of the energy storage capacitor and the difference value between the voltages to obtain an output current reference value of the energy storage capacitor.
10. A control device of a voltage compensation circuit, comprising:
a memory; and
A processor coupled to the memory, the processor configured to execute the control method of the voltage compensation circuit of any of claims 1-7 based on instructions stored in the memory.
11. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, implements a method of controlling a voltage compensation circuit according to any one of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910366669.5A CN110011294B (en) | 2019-05-05 | 2019-05-05 | Voltage compensation circuit, control method thereof and air conditioner driving system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910366669.5A CN110011294B (en) | 2019-05-05 | 2019-05-05 | Voltage compensation circuit, control method thereof and air conditioner driving system |
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| Publication Number | Publication Date |
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| CN110011294A CN110011294A (en) | 2019-07-12 |
| CN110011294B true CN110011294B (en) | 2024-05-24 |
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| CN112383234A (en) * | 2020-10-31 | 2021-02-19 | 青岛鼎信通讯股份有限公司 | Circuit and method for reducing switching power supply ripple for power industry product |
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