CN114172344A - PWM (pulse-width modulation) topology control method and device and power supply system - Google Patents

PWM (pulse-width modulation) topology control method and device and power supply system Download PDF

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CN114172344A
CN114172344A CN202111329058.7A CN202111329058A CN114172344A CN 114172344 A CN114172344 A CN 114172344A CN 202111329058 A CN202111329058 A CN 202111329058A CN 114172344 A CN114172344 A CN 114172344A
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CN114172344B (en
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易龙强
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Zhangzhou Kehua Technology Co Ltd
Kehua Data Co Ltd
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Kehua Data Co Ltd
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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
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels

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Abstract

The invention provides a PWM topology control method, a device and a power supply system, wherein the method is applied to the PWM topology in a power supply circuit, and the power supply circuit also comprises an LC filter circuit connected with the output end of the PWM topology; the PWM topology control method comprises the following steps: acquiring capacitor voltage, inductor current and output load current corresponding to the LC filter circuit; determining a current reference value based on the capacitor voltage, a preset voltage reference value, and the differential of the voltage reference value and the output load current, and determining the input voltage of the LC filter circuit according to the current reference value, the inductive current, the differential of the current reference value and the capacitor voltage; and determining the pulse width modulation amount of the PWM topology according to the input voltage of the LC filter circuit, and controlling the PWM topology based on the pulse width modulation amount. The invention has good voltage tracking performance and anti-interference capability.

Description

PWM (pulse-width modulation) topology control method and device and power supply system
Technical Field
The invention belongs to the technical field of PWM control circuits, and particularly relates to a PWM topology control method and device and a power supply system.
Background
A PWM (Pulse Width Modulation) topology is a common topology in a power supply circuit, and in order to ensure the stability of a circuit where the PWM topology is located, the PWM topology needs to be controlled, and the control requirement is good voltage tracking performance and interference resistance.
In the prior art, the control of the PWM topology is usually realized based on PI (proportional integral) control. As shown in fig. 6, the conventional PI controller is composed of a voltage and current dual closed-loop control. The error value of the voltage reference value and the capacitor voltage is used as a current reference value to form a voltage outer ring by the PI controller and the output load current feedforward; then, the error value of the current reference value and the inductive current is modulated and output by a topology output control quantity formed by adding capacitance voltage feedforward through the PI controller, so that the topology output alternating voltage is controlled. However, in practical applications, it is difficult to achieve a given and feedback-free control in ac control due to the conventional PI controller. Therefore, it is difficult to achieve the ideal index in both the output waveform quality and the output dynamic index. In engineering, it is usually necessary to supplement other control loops, such as repetitive controllers, to increase the output parameter index, which increases the control cost.
Disclosure of Invention
The invention aims to provide a PWM (pulse-width modulation) topology control method and device and a power supply system, so as to improve the voltage tracking performance and the anti-interference capability of the PWM topology control on the basis of not needing an additional control loop.
In order to achieve the above object, the present invention adopts a technical solution of providing a PWM topology control method, where the PWM topology control method is applied to a PWM topology in a power supply circuit, and the power supply circuit further includes an LC filter circuit connected to an output terminal of the PWM topology; the PWM topology control method comprises the following steps:
acquiring capacitor voltage, inductor current and output load current corresponding to the LC filter circuit;
determining a current reference value based on the capacitor voltage, a preset voltage reference value, the differential of the voltage reference value and the output load current, and determining an input voltage of the LC filter circuit according to the current reference value, the inductor current, the differential of the current reference value and the capacitor voltage;
and determining the pulse width modulation amount of the PWM topology according to the input voltage of the LC filter circuit, and controlling the PWM topology based on the pulse width modulation amount.
In one possible implementation, the determining a current reference value based on the capacitor voltage, a preset voltage reference value, and a differential of the voltage reference value and the output load current includes:
determining a voltage error value based on the capacitor voltage and a preset voltage reference value, and inputting the voltage error value into a preset voltage loop controller to obtain a first reference value;
determining a capacitance current compensation value according to the differential of the voltage reference value;
determining a current reference value based on the first reference value, the capacitance current compensation value, and a feed-forward value using the output load current as the feed-forward value.
In one possible implementation, the determining a current reference value based on the first reference value, the capacitance current compensation value, and the feed-forward value includes:
and taking the sum of the first reference value, the capacitance current compensation value and the feedforward value as a current reference value.
In one possible implementation, the determining the input voltage of the LC filter circuit according to the current reference value, the inductor current, the differential of the current reference value, and the capacitor voltage includes:
determining a current error value based on the current reference value and the inductive current, and inputting the current error value into a preset current loop controller to obtain a second reference value;
determining an inductor voltage compensation value according to the differential of the current reference value;
determining an input voltage of the LC filter circuit based on the second reference value, the inductor voltage compensation value, and the capacitor voltage.
In one possible implementation, before determining the input voltage of the LC filter circuit based on the second reference value, the inductor voltage compensation value, and the capacitor voltage, the PWM topology control method further includes:
determining a voltage error value based on the capacitor voltage and a preset voltage reference value, and determining a harmonic compensation value according to the voltage error value;
correspondingly, the determining the input voltage of the LC filter circuit based on the second reference value, the inductor voltage compensation value, and the capacitor voltage includes:
and determining the input voltage of the LC filter circuit according to the harmonic compensation value, the second reference value, the inductance voltage compensation value and the capacitance voltage.
In one possible implementation, the determining the input voltage of the LC filter circuit according to the harmonic compensation value, the second reference value, the inductance voltage compensation value, and the capacitance voltage includes:
obtaining an inductance equivalent series resistance corresponding to the LC filter circuit, and determining a feed-forward voltage according to the capacitor voltage, the inductance current and the inductance equivalent series resistance;
and taking the sum of the harmonic compensation value, the second reference value, the inductance voltage compensation value and the feedforward voltage as the input voltage of the LC filter circuit.
In one possible implementation, the determining a pulse width modulation amount of the PWM topology according to the input voltage of the LC filter circuit includes:
acquiring the direct current bus voltage of the power supply circuit;
determining a pulse width modulation amount of the PWM topology based on the input voltage of the LC filter circuit and the DC bus voltage.
In one possible implementation, the controlling the PWM topology based on the pulse width modulation amount includes:
and generating a PWM wave based on the pulse width modulation amount and outputting the PWM wave to the PWM topology.
In another aspect of the present invention, there is also provided a PWM topology control apparatus, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the PWM topology control method described above when executing the computer program.
In still another aspect of the present invention, there is provided a power supply system including:
the above-described power supply circuit and the above-described PWM topology control device, which is connected to the PWM topology in the power supply circuit.
The PWM topology control method and device and the power supply system provided by the invention have the beneficial effects that:
the invention is different from the scheme of directly realizing PWM topology control based on PI control in the prior art, calculates the differential of the voltage reference value and the differential of the current reference value, introduces the differential of the voltage reference value and the differential of the current reference value into the calculation of the input voltage of the LC filter circuit, and further realizes the compensation of capacitance current through the differential of the voltage reference value and the compensation of inductance voltage through the differential of the current reference value, thereby reducing the influence of the capacitance current and the inductance voltage on the voltage tracking performance and improving the voltage tracking speed of the PWM topology control. On the basis, when the power supply circuit is loaded suddenly, the voltage can be quickly stabilized, and the anti-interference performance of the whole power supply circuit is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described 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 without creative efforts.
Fig. 1 is a schematic flowchart of a PWM topology control method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a power supply circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a PWM topology control apparatus according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a power supply system according to an embodiment of the present invention;
FIG. 5 is a PI control loop diagram of an improvement to the addition compensation loop provided by one embodiment of the present invention;
FIG. 6 is a diagram of a conventional PI control loop according to an embodiment of the present invention;
fig. 7 is a first simulation diagram corresponding to a conventional PI control according to an embodiment of the present invention;
FIG. 8 is a first simulation diagram corresponding to an improved PI control for adding a compensation loop according to an embodiment of the present invention;
fig. 9 is a second simulation diagram corresponding to the conventional PI control according to an embodiment of the present invention;
FIG. 10 is a second simulation diagram corresponding to the PI control with the improved addition compensation loop provided by an embodiment of the present invention;
fig. 11 is a third simulation diagram corresponding to the conventional PI control according to an embodiment of the present invention;
FIG. 12 is a third simulation diagram corresponding to the improved PI control for adding the compensation loop according to an embodiment of the present invention;
fig. 13 is a fourth simulation diagram corresponding to the conventional PI control according to an embodiment of the present invention;
FIG. 14 is a fourth simulation diagram corresponding to the improved PI control for adding the compensation loop according to an embodiment of the present invention;
fig. 15 is a fifth simulation diagram corresponding to a conventional PI control according to an embodiment of the present invention;
FIG. 16 is a fifth simulation diagram corresponding to the improved PI control for adding the compensation loop according to an embodiment of the present invention;
fig. 17 is a sixth simulation diagram corresponding to the conventional PI control according to an embodiment of the present invention;
fig. 18 is a sixth simulation diagram corresponding to the improved PI control for adding the compensation loop according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The technical scheme adopted by the invention is to provide a PWM (pulse-width modulation) topology control method, the PWM topology control method is applied to a PWM topology in a power supply circuit, the structure of the power supply circuit can refer to fig. 2, as shown in fig. 2, the power supply circuit also comprises an LC (inductance-capacitance) filter circuit connected with the output end of the PWM topology, and in fig. 2, UinIs the input voltage, i, of the LC filter circuitL(t) is the inductive current, Uc(t) is the capacitor voltage, L is the inductance, C is the capacitance, ioIs the output load current of the LC filter circuit. The PWM topology described in the embodiment of the present invention may be a single-phase T-type three-level inverter topology, a single-phase I-type three-level inverter topology, or the like.
Referring to fig. 1, fig. 1 is a schematic flow chart of a PWM topology control method according to an embodiment of the present invention, where the PWM topology control method includes:
s101: and acquiring the capacitor voltage, the inductance current and the output load current corresponding to the LC filter circuit.
In this embodiment, the capacitance voltage, the inductance current, and the output load current of the LC filter circuit may be collected by the data collection device for subsequent control. The data acquisition device includes, but is not limited to, a voltage sensor, a current sensor, and the like.
S102: and determining a current reference value based on the capacitor voltage, a preset voltage reference value and the differential of the voltage reference value and the output load current, and determining the input voltage of the LC filter circuit according to the current reference value, the inductive current, the differential of the current reference value and the capacitor voltage.
In this embodiment, the first reference value may be determined based on the capacitor voltage and a preset voltage reference value, the capacitor current compensation value may be determined based on a differential of the voltage reference value, and the final current reference value may be determined according to the first reference value, the capacitor current compensation value, and the output load current.
In this embodiment, the second reference value may be determined according to the current reference value and the inductor current, the inductor voltage compensation value may be determined based on a differential of the current reference value, and the final input voltage of the LC filter circuit may be determined according to the second reference value, the inductor voltage compensation value, and the capacitor voltage.
S103: and determining the pulse width modulation amount of the PWM topology according to the input voltage of the LC filter circuit, and controlling the PWM topology based on the pulse width modulation amount.
In one possible implementation, determining a pulse width modulation amount of the PWM topology according to an input voltage of the LC filter circuit includes:
and acquiring the direct current bus voltage of the power supply circuit, and determining the pulse width modulation amount of the PWM topology based on the input voltage of the LC filter circuit and the direct current bus voltage.
Wherein, can pass through
Figure BDA0003347996720000061
Calculating the pulse width modulation amount of the PWM topology, wherein UdcThe dc bus voltage is the dc bus voltage.
In one possible implementation, controlling the PWM topology based on the amount of pulse width modulation includes:
and generating a PWM wave based on the pulse width modulation amount and outputting the PWM wave to the PWM topology.
The embodiment of the invention also calculates the differential of the voltage reference value and the differential of the current reference value, introduces the differential of the voltage reference value and the differential of the current reference value into the calculation of the input voltage of the LC filter circuit, and further realizes the compensation of capacitance current through the differential of the voltage reference value and the compensation of inductance voltage through the differential of the current reference value, thereby reducing the influence of the capacitance current and the inductance voltage on the voltage tracking performance and improving the voltage tracking speed of the PWM topology control. On the basis, when the power supply circuit is loaded suddenly, the embodiment of the invention can realize the quick voltage stabilization, thereby improving the anti-interference performance of the whole power supply circuit.
In one possible implementation, determining the current reference value based on the capacitor voltage, a preset voltage reference value, and a differential of the voltage reference value, the output load current includes:
and determining a voltage error value based on the capacitor voltage and a preset voltage reference value, and inputting the voltage error value into a preset voltage loop controller to obtain a first reference value.
The capacitance-current compensation value is determined from the differential of the voltage reference value.
And taking the output load current as a feedforward value, and determining a current reference value based on the first reference value, the capacitance current compensation value and the feedforward value.
In this embodiment, a difference between a preset voltage reference value and the capacitor voltage may be used as a voltage error value, and the voltage error value is input to a preset voltage loop controller to obtain a first reference value.
In this embodiment, the differentiation of the voltage reference value (i.e., differentiation of the voltage reference value) may be performed
Figure BDA0003347996720000071
) Equivalent to a capacitance current compensation value, where K1Is a first predetermined coefficient.
In one possible implementation, the sum of the first reference value, the capacitance current compensation value, and the feed-forward value may be used as the current reference value.
In one possible implementation, determining the input voltage of the LC filter circuit according to the current reference value, the inductor current, the differential of the current reference value, and the capacitor voltage includes:
and determining a current error value based on the current reference value and the inductive current, and inputting the current error value into a preset current loop controller to obtain a second reference value.
The inductor voltage compensation value is determined from the differential of the current reference value.
And determining the input voltage of the LC filter circuit based on the second reference value, the inductance voltage compensation value and the capacitance voltage.
In this embodiment, the difference between the current reference value and the inductor current may be used as a current error value, and the current error value is input to a preset current loop controller to obtain a second reference value.
In this embodiment, the differentiation of the current reference value (i.e., the differentiation of the current reference value) may be performed
Figure BDA0003347996720000081
) Equivalent to an inductor voltage compensation value, where K2Is a second predetermined coefficient.
In one possible implementation manner, before determining the input voltage of the LC filter circuit based on the second reference value, the inductor voltage compensation value, and the capacitor voltage, the PWM topology control method further includes:
and determining a voltage error value based on the capacitor voltage and a preset voltage reference value, and determining a harmonic compensation value according to the voltage error value.
Correspondingly, the input voltage of the LC filter circuit is determined based on the second reference value, the inductance voltage compensation value and the capacitance voltage, and the method comprises the following steps:
and determining the input voltage of the LC filter circuit according to the harmonic compensation value, the second reference value, the inductance voltage compensation value and the capacitance voltage.
In this embodiment, the voltage error value includes a harmonic, so that the harmonic compensation value can be determined according to the voltage error value, and further the input voltage of the LC filter circuit is determined according to the harmonic compensation value, the second reference value, the inductor voltage compensation value, and the capacitor voltage, so as to implement harmonic compensation and further improve the dynamic performance.
Wherein the passing delta K3Calculating a harmonic compensation value, wherein δ is a current error value, K3Is a third predetermined coefficient determined by the capacitance and inductance.
In one possible implementation, determining the input voltage of the LC filter circuit according to the harmonic compensation value, the second reference value, and the inductor voltage compensation value includes:
and obtaining the equivalent series resistance of the inductor corresponding to the LC filter circuit, and determining the feedforward voltage according to the capacitor voltage, the inductor current and the equivalent series resistance of the inductor.
And taking the sum of the harmonic compensation value, the second reference value, the inductance voltage compensation value and the feedforward voltage as the input voltage of the LC filter circuit.
In this embodiment, it can be based on Uc(t)+r×iL(t) determining a feed forward voltage, wherein r is an inductance equivalent series resistance.
As a specific implementation manner provided by the embodiment of the present invention, refer to fig. 5, where x in fig. 51dIs a predetermined voltage reference value, x1＝Uc(t)，x2dIs a current reference value, x2＝iL(t), e is the voltage error value, δ is the current error value. As shown in fig. 5, the reference value x can be determined according to the voltage1dAnd the capacitor voltage x1Determining a voltage error value e, and further determining a first reference value according to the differential of the voltage reference value and the voltage reference value x1dDetermining the compensation value of the capacitor current, and combining the output load current i of the LC filter circuitoDetermining a current reference value x2d. Then according to the current reference value x2dAnd the inductor current x2Determining a current error value delta and thus a second reference value, based on the differential of the current reference value and the current reference value x2dDetermining the compensation value of the inductor voltage, and finally combining the feedforward voltage x1+r×x2The input voltage U of the LC filter circuit can be obtainedinAccording to the input voltage UinAnd DC bus voltage UdcAnd determining the pulse width adjustment amount, and finally generating a PWM wave to realize PWM topology control.
In this embodiment, reference may be made to fig. 6 (fig. 6 is a conventional PI control, where the parameter meaning is the same as fig. 5), and a comparison of the two shows that, compared with a complex repetitive controller, the embodiment of the present invention effectively implements output and given non-static-difference control by three simpler compensation control loops, thereby improving the output index of the conventional PI control loop. The three compensation loops are: firstly, capacitance current compensation is carried out on given inductance current (namely a current reference value) according to the characteristics of capacitance and inductance devices in a PWM topology; secondly, compensating the output alternating current modulation voltage by using the inductance voltage; and thirdly, adding the error of the capacitor voltage into the forward channel to perform harmonic compensation. The voltage tracking performance and the anti-interference capability of the circuit are further improved through simple loop compensation.
On the basis of obtaining the scheme of the embodiment of the invention, the invention also carries out simulation verification, and the result is as follows:
in the aspect of rapidity, reference may be made to fig. 7 and 8, where fig. 7 shows that, in a comparison experiment, the effective value of the conventional PI control is converged slowly, and it takes about 0.08s to output a waveform meeting the requirement when starting, whereas the scheme provided by the embodiment of the present invention in fig. 8 directly gives a control value without an effective value loop, and convergence is fast. The sinusoidal waveform can be tracked at start-up. In terms of rapidity, reference may also be made to fig. 9 and 10, fig. 9 shows that, when the conventional PI control needs to be performed for 0.8s, the THDV can be stabilized within 1%, and fig. 10 shows that, when the scheme provided by the embodiment of the present invention is performed for the second period, i.e., for 0.02s, the THDV can be satisfied within 1% (where, the red portions in fig. 9 and 10 refer to circled portions).
In terms of accuracy, reference may be made to fig. 11 and 12, where fig. 11 shows that the conventional PI control effective value loop has a slow convergence, and needs a long time to output a waveform meeting the requirement, whereas fig. 12 shows that the embodiment of the present invention directly gives a control value, has no effective value loop, and has a fast convergence. The sinusoidal waveform can be tracked at start-up. In terms of accuracy, reference may also be made to fig. 13 and 14, where fig. 13 shows that, for a conventional PI control starting from 0.8s, the PI control corresponds to an output voltage and a setpoint with an error ranging from-6V to 6V, whereas fig. 14 shows that the scheme of the present invention corresponds to an output voltage and a setpoint with an error ranging from-3V to 3V.
With respect to stability, reference may be made to fig. 15 and 16, where fig. 15 shows that at 0.2s, with the RCD load applied suddenly, the conventional PI control waveform is partially distorted and the peak is clipped. In contrast, in the scheme of the invention shown in fig. 16, at 0.2s, the RCD load is applied suddenly, and the waveform is basically undistorted. In terms of stability, reference may also be made to fig. 17 and 18, where fig. 17 shows that the THDV is 3.64% under RCD load for the conventional PI control, and 0.64% under RCD load for the embodiment of the present invention in fig. 18.
In summary, the scheme of the embodiment of the invention is superior to the traditional PI control scheme in aspects of rapidity, accuracy and stability.
In another aspect of the present invention, there is provided a PWM topology control apparatus 300, including: one or more processors 301, one or more input devices 302, one or more output devices 303, and one or more memories 304. The processor 301, the input device 302, the output device 303, and the memory 304 are in communication with each other via a communication bus 305. The memory 304 is used to store a computer program comprising program instructions. Processor 301 is operative to execute program instructions stored in memory 304. Wherein the processor 301 is configured to invoke program instructions to perform the steps of the above-described method embodiments. It should be understood that, in the embodiment of the present invention, the processor 301 may be a Central Processing Unit (CPU). The processor may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field-programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The input device 302 may include a touch pad, a fingerprint sensor (for collecting fingerprint information of a user and direction information of the fingerprint), a microphone, etc., and the output device 303 may include a display (LCD, etc.), a speaker, etc. The memory 304 may include a read-only memory and a random access memory, and provides instructions and data to the processor 301. A portion of the memory 304 may also include non-volatile random access memory. For example, the memory 304 may also store device type information. In a specific implementation manner, the processor 301, the input device 302, and the output device 303 described in the embodiment of the present invention may execute the implementation manners described in the first embodiment and the second embodiment of the PWM topology control method provided in the embodiment of the present invention.
Referring to fig. 4, in a further aspect of the present invention, there is provided a power supply system 40, including:
the above-described power supply circuit and the above-described PWM topology control apparatus are connected to the PWM topology in the power supply circuit.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A PWM topological control method is characterized in that the PWM topological control method is applied to PWM topology in a power supply circuit, and the power supply circuit further comprises an LC filter circuit connected with the output end of the PWM topology; the PWM topology control method comprises the following steps:
acquiring capacitor voltage, inductor current and output load current corresponding to the LC filter circuit;
determining a current reference value based on the capacitor voltage, a preset voltage reference value, the differential of the voltage reference value and the output load current, and determining an input voltage of the LC filter circuit according to the current reference value, the inductor current, the differential of the current reference value and the capacitor voltage;
and determining the pulse width modulation amount of the PWM topology according to the input voltage of the LC filter circuit, and controlling the PWM topology based on the pulse width modulation amount.
2. The PWM topology control method according to claim 1, wherein said determining a current reference value based on said capacitor voltage, a preset voltage reference value, and a differential of said voltage reference value, said output load current comprises:
determining a voltage error value based on the capacitor voltage and a preset voltage reference value, and inputting the voltage error value into a preset voltage loop controller to obtain a first reference value;
determining a capacitance current compensation value according to the differential of the voltage reference value;
determining a current reference value based on the first reference value, the capacitance current compensation value, and a feed-forward value using the output load current as the feed-forward value.
3. The PWM topology control method according to claim 2, wherein said determining a current reference value based on said first reference value, said capacitance current compensation value and said feed forward value comprises:
and taking the sum of the first reference value, the capacitance current compensation value and the feedforward value as a current reference value.
4. The PWM topology control method according to claim 1, wherein said determining an input voltage of said LC filter circuit based on said current reference value, said inductor current, a differential of said current reference value, said capacitor voltage comprises:
determining a current error value based on the current reference value and the inductive current, and inputting the current error value into a preset current loop controller to obtain a second reference value;
determining an inductor voltage compensation value according to the differential of the current reference value;
determining an input voltage of the LC filter circuit based on the second reference value, the inductor voltage compensation value, and the capacitor voltage.
5. The PWM topology control method according to claim 4, wherein before determining the input voltage of the LC filter circuit based on the second reference value, the inductor voltage compensation value, and the capacitor voltage, the PWM topology control method further comprises:
determining a voltage error value based on the capacitor voltage and a preset voltage reference value, and determining a harmonic compensation value according to the voltage error value;
correspondingly, the determining the input voltage of the LC filter circuit based on the second reference value, the inductor voltage compensation value, and the capacitor voltage includes:
and determining the input voltage of the LC filter circuit according to the harmonic compensation value, the second reference value, the inductance voltage compensation value and the capacitance voltage.
6. The PWM topology control method according to claim 5, wherein the determining the input voltage of the LC filter circuit according to the harmonic compensation value, the second reference value, the inductor voltage compensation value, and the capacitor voltage comprises:
obtaining an inductance equivalent series resistance corresponding to the LC filter circuit, and determining a feed-forward voltage according to the capacitor voltage, the inductance current and the inductance equivalent series resistance;
and taking the sum of the harmonic compensation value, the second reference value, the inductance voltage compensation value and the feedforward voltage as the input voltage of the LC filter circuit.
7. The PWM topology control method according to any one of claims 1 to 6, wherein the determining a pulse width modulation amount of the PWM topology according to the input voltage of the LC filter circuit comprises:
acquiring the direct current bus voltage of the power supply circuit;
determining a pulse width modulation amount of the PWM topology based on the input voltage of the LC filter circuit and the DC bus voltage.
8. The PWM topology control method according to any one of claims 1 to 6, wherein controlling the PWM topology based on the pulse width modulation amount includes:
and generating a PWM wave based on the pulse width modulation amount and outputting the PWM wave to the PWM topology.
9. A PWM topology control apparatus comprising a memory, a processor and a computer program stored in said memory and executable on said processor, characterized in that said processor implements the steps of the method according to any one of claims 1 to 8 when executing said computer program.
10. A power supply system, comprising: a supply circuit as claimed in claim 1 and a PWM topology control apparatus as claimed in claim 9, the PWM topology control apparatus being connected to a PWM topology in the supply circuit.
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