CN116260343A - Low-ripple adjustable direct-current stabilized power supply control method based on Buck-Boost inverter circuit - Google Patents
Low-ripple adjustable direct-current stabilized power supply control method based on Buck-Boost inverter circuit Download PDFInfo
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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Abstract
The invention provides a low-ripple adjustable direct-current stabilized power supply control method based on a Buck-Boost inverter circuit, which adopts a proportional integral-vector proportional integral composite control algorithm to calculate the deviation between a capacitor reference voltage and an actual voltage in the inverter circuit, converts the obtained capacitor reference current into an inductance reference current, adopts the proportional integral-vector proportional integral composite control algorithm to calculate the deviation between the inductance reference current and the actual current, and controls a corresponding power switch in the inverter circuit according to the obtained duty ratio, so that the purpose of effectively improving the steady-state accuracy of the output voltage of the direct-current stabilized power supply can be achieved on the basis of keeping the actual output voltage of the direct-current stabilized power supply to accurately track the set reference output voltage without static difference. The control method provided by the invention has the characteristics of simple control algorithm, high steady-state accuracy of output voltage, small ripple, good dynamic performance and the like.
Description
Technical Field
The invention relates to the field of direct-current stabilized power supplies, in particular to a low-ripple adjustable direct-current stabilized power supply control method based on a Buck-Boost inverter circuit.
Background
The direct current stabilized power supply is formed by the links of rectification, voltage stabilization and the like of the alternating current power supply, and has been widely applied in various fields of national economy. Technical indexes such as steady-state precision and ripple of output voltage of a direct-current stabilized power supply will have important influence on application objects of the direct-current stabilized power supply, and particularly for some precise instruments such as scanning electron microscopes, transmission electron microscopes and the like, a key factor for determining the resolution of the electron microscope is high stability of the output voltage of a low-ripple high-voltage direct-current power supply, a great deal of research on the aspect of the low-ripple high-stability direct-current stabilized power supply is carried out at present, and various main circuit schemes such as rectifying-high-frequency inverter-transformer boosting-rectifying and the like are provided, and although good effects are obtained, the defects of complex circuit structure, large volume and the like still exist. Therefore, the chinese patent application CN 202211033703.5-a low ripple adjustable dc voltage-stabilized power supply and a control method thereof, which provide an adjustable dc voltage-stabilized power supply topology structure and a corresponding control method, not only simplify the main circuit structure (only including a three-phase PWM rectifying circuit, a three-phase staggered parallel Buck-Boost intermediate frequency inverter circuit, and a three-phase bridge uncontrollable rectifying circuit, which are sequentially connected in series), but also have the characteristics of arbitrary adjustable output voltage, etc., but still fail to solve the technical requirements of high steady-state precision and low ripple of the output voltage.
Disclosure of Invention
In order to solve the technical problems, the invention provides a control method of a low-ripple adjustable direct-current regulated power supply based on a Buck-Boost inverter circuit, which is characterized in that a proportional-integral-vector proportional-integral composite control algorithm is adopted to calculate the deviation between a capacitor reference voltage in the Buck-Boost inverter circuit and an actual voltage of the capacitor reference voltage to obtain a capacitor reference current, the obtained capacitor reference current is converted into an inductor reference current, then the proportional-integral-vector proportional-integral composite control algorithm is continuously adopted to calculate the deviation between the inductor reference current and the actual current of the inductor reference current to obtain a duty ratio, and a corresponding power switch in the Buck-Boost inverter circuit is controlled according to the obtained duty ratio.
Preferably, the control method includes the steps of:
(1) Real-time detection of output voltage actual measurement value U of direct-current stabilized power supply DC According to the preset value U of the output voltage of the direct current stabilized power supply DCref Calculating an output voltage reference value u of the three-phase staggered parallel Buck-Boost inverter circuit ref ；
(2) According to the output voltage reference value u of the Buck-Boost inverter circuit obtained in the step (1) ref Obtaining a capacitance reference voltage u in the inverter circuit Cref ；
(3) Detecting the actual voltage u of the capacitor in real time C According to the capacitance reference voltage u obtained in the step (2) Cref Calculate the deviation Deltau C The capacitance reference current i is obtained through the processing of a proportional integral-vector proportional integral composite control algorithm Cref ；
(4) Real-time detection of actual output current i of Buck-Boost inverter circuit and direct-current voltage at input side of Buck-Boost inverter circuit
Actual value u of capacitance voltage C According to the capacitance reference current i obtained in the step (3) Cref The inductance reference current i in the Buck-Boost inverter circuit is calculated Lref ；
(5) Real-time detection of inductor actual current i L The reference current i of the inductor obtained according to the step (4) Lref Calculate the deviation Δi L The inductance reference voltage u is obtained through the processing of a proportional integral-vector proportional integral composite control algorithm Lref ；
(6) The inductive reference voltage u obtained according to step (5) Lref And real-time detection of direct current voltage at input side of Buck-Boost inverter circuit
Actual value u of capacitance voltage C Obtaining the duty ratio d of a corresponding power switch in the Buck-Boost inverter circuit;
(7) And (3) controlling a corresponding power switch in the Buck-Boost inverter circuit according to the duty ratio d and the corresponding switching period obtained in the step (6).
More preferably, the output voltage reference u of the Buck-Boost inverter circuit in step (1) is calculated by the formula (1) ref ：
Wherein: u (U) DCref The reference value of the output voltage of the direct-current stabilized power supply is preset, omega and theta are respectively the angular frequency and the initial phase angle of the reference value of the output voltage of the Buck-Boost inverter circuit, t is a certain moment of operation of the Buck-Boost inverter circuit, and L -1 For the Laplace inverse transformation operator, deltaU(s) is the Laplace image function of the output voltage deviation DeltaU, G 3 (s) is the transfer function of the PI controller.
More preferably, the reference voltage u of the capacitor in step (2) is calculated by equation (3) Cref ：
Wherein: k is a direct current bias voltage coefficient, U DCref The reference value of the output voltage of the direct current stabilized power supply is preset, u ref Is the output voltage reference value L of the Buck-Boost inverter circuit -1 For the Laplace inverse transformation operator, deltaU(s) is the Laplace image function of the output voltage deviation DeltaU, G 3 (s) is the transfer function of the PI controller.
Further, the transfer function G of the PI controller is calculated by the formula (2) 3 (s)：
Wherein: k (K) P And K I The proportional coefficient and the integral coefficient are respectively, and s is a differential operator.
More preferably, the capacitance reference current i in the inverter circuit in step (3) is calculated by the formula (4) Cref ：
i Cref ＝L -1 [G 1 (s)·Δu C (s)] (4)
Wherein: l (L) -1 For the Law's inverse transform operator, deltau C (s) is the capacitance voltage deviation Deltau C Laplace image function, G 1 (s) is a transfer function of the proportional-integral-vector proportional-integral composite controller, wherein:
wherein: a=k CP /r C ，b 1 ＝-K CP +r C CK CI +2r C CK CV ，b 2 ＝-25K CP ω 2 +2r C CK CR ，b 3 ＝-25K CI r C Cω 2 ，c 1 ＝r C 2 C，c 2 ＝r C ，c 3 ＝25r C (1+r C C)ω 2 Wherein K is CP And K CI Proportional and integral coefficients, K, of proportional and integral control, respectively CV And K CR The proportional coefficient and the gain coefficient of the vector proportional integral control are respectively, wherein K CR ＝8K CV R f /π 2 L，R f Omega is the output voltage angular frequency of the Buck-Boost inverter circuit, C is the capacitance value in the Buck-Boost inverter circuit, and r is the load resistance C The equivalent resistance of the capacitor C, and s is a differential operator.
More preferably, the inductive reference current i of step (4) is obtained by equation (6) Lref ：
Wherein: i is the actual output current of the Buck-Boost inverter circuit, u C In the form of a capacitor voltage, the capacitor voltage,
the DC voltage at the input side of the Buck-Boost inverter circuit.
More preferably, the inductance reference voltage u in step (5) is obtained by the formula (7) Lref ：
u Lref ＝L -1 [G 2 (s)·Δi L (s)] (7)
Wherein: l (L) -1 For the Law's inverse transform operator Δi L (s) is the inductor current deviation Δi L Laplace image function, Δi L ＝i L -i Lref ，G 2 (s) is a transfer function of the proportional-integral-vector proportional-integral composite controller, wherein:
wherein: d, d 1 ＝K LP ，d 2 ＝K LI +2K LV ，d 3 ＝2K LR +25K LP ω 2 ，d 4 ＝25K LI ω 2 ，e 1 ＝L，e 2 ＝r L ，e 3 ＝25Lω 2 ,e 4 ＝25r L ω 2 Wherein K is LP And K LI Proportional and integral coefficients, K, of proportional and integral control, respectively LV And K LR The proportional coefficient and the gain coefficient of the vector proportional integral control are respectively, wherein K CR ＝8K CV R f /π 2 L，R f Omega is the output voltage angular frequency of the Buck-Boost inverter circuit, L is the inductance value in the Buck-Boost inverter circuit, and r is the load resistance L And the equivalent resistance of the inductor L is T is the switching period of a power switch in the Buck-Boost inverter circuit, and s is a differential operator.
More preferably, in step (6), the duty cycle d is obtained by the formula (9):
wherein: u (u) C Is the actual measurement value of the voltage of the capacitor,
the measured value of the direct current voltage at the input side of the Buck-Boost inverter circuit.
The invention has the beneficial effects that: the low-ripple adjustable direct current stabilized power supply control method based on the Buck-Boost inverter circuit outputs a voltage reference value, calculates the deviation between a capacitor reference voltage in the Buck-Boost inverter circuit and the actual voltage of the capacitor reference voltage by adopting a proportional-integral-vector proportional-integral composite control algorithm, converts the obtained capacitor reference current into an inductor reference current, and then continuously calculates the deviation between the inductor reference current and the actual current of the inductor reference current by adopting a proportional-integral-vector proportional-integral composite control algorithm to obtain the duty ratio of a corresponding power switch in the Buck-Boost inverter circuit; the corresponding power switch in the Buck-Boost inverter circuit is controlled according to the obtained duty ratio, so that the aims of effectively improving the steady-state precision of the output voltage and reducing the output ripple of the output voltage can be achieved on the basis of keeping the actual output voltage of the direct-current stabilized power supply to accurately track the set reference output voltage without static difference. The control method provided by the invention has the characteristics of simple control algorithm, high steady-state accuracy of output voltage, small ripple, good dynamic performance and the like.
Drawings
FIG. 1 is a main circuit topology structure diagram of a low ripple adjustable DC stabilized voltage supply based on a Buck-Boost inverter circuit;
FIG. 2 is a schematic block diagram of a control method of a low ripple adjustable DC regulated power supply based on a Buck-Boost inverter circuit;
fig. 3 is a waveform diagram of an output dc voltage with reference value of 1000V of the output voltage of the low ripple adjustable dc voltage-stabilized power supply based on the Buck-Boost inverter circuit provided by the invention.
Detailed Description
The invention is further described below with reference to the drawings and examples.
Fig. 1 is a topology structure diagram of a main circuit of a low-ripple adjustable direct-current stabilized voltage supply based on a Buck-Boost inverter circuit. The topological structure adopts an AC-DC-AC-DC structural form and comprises a three-phase PWM rectification circuit, a three-phase staggered parallel Buck-Boost intermediate frequency inverter circuit and a three-phase bridge type uncontrollable rectification circuit 3, wherein:
the three-phase PWM rectifying circuit is composed of 6 full-control power switches and is used for rectifying three-phase input alternating-current voltage into PWM-modulated direct-current voltage; the three-phase staggered parallel Buck-Boost intermediate frequency inverter circuit is formed by 3 groups of Buck-Boost Buck circuits in a phase staggered parallel mode and is used for inverting PWM (pulse width modulation) direct-current voltage output by the three-phase PWM rectifying circuit into three-phase symmetrical intermediate frequency sinusoidal alternating-current voltage with randomly adjustable amplitude and frequency; the three-phase bridge type uncontrollable rectifying circuit is composed of 6 rectifying diodes and 1 filter capacitor and is used for rectifying the three-phase symmetrical medium-frequency sinusoidal alternating voltage output by the three-phase staggered parallel Buck-Boost medium-frequency inverting circuit into direct-current voltage.
The control method of the low-ripple adjustable direct-current stabilized power supply adopting the Buck-Boost intermediate-frequency inverter circuit comprises the following specific steps of:
(1) Preset value U according to output voltage of direct current stabilized power supply DCref And output voltage measured value U DC The output voltage reference value u of the three-phase staggered parallel Buck-Boost intermediate frequency inverter circuit is calculated through a formula (1) ref ：
Wherein: u (U) DCref The reference value of the output voltage of the direct-current stabilized power supply is preset, omega and theta are respectively the angular frequency and the initial phase angle of the reference value of the output voltage of the Buck-Boost inverter circuit, t is a certain moment of operation of the Buck-Boost inverter circuit, and L -1 For the inverse Laplace transform operator, ΔU(s) is the Laplace image function of the output voltage deviation ΔU, ΔU=U DC -U DCref ，G 3 (s) isThe transfer function of the PI controller has the following functional relation:
wherein: k (K) P And K I The proportional coefficient and the integral coefficient are respectively, and s is a differential operator.
(2) According to the output voltage reference value u of the Buck-Boost intermediate frequency inverter circuit obtained in the step (1) ref Obtaining a capacitance reference voltage u in the inverter circuit Cref The method specifically comprises the following steps:
wherein: k is a direct current bias voltage coefficient, and is obtained by a computer simulation result, and in the embodiment, the value is 1.5, U DCref The reference value of the output voltage of the direct current stabilized power supply is preset, u ref The reference value is the output voltage of the Buck-Boost intermediate frequency inverter circuit.
(3) The capacitance reference voltage u obtained according to step (2) Cref At the same time, the actual voltage u of the capacitor is detected in real time C The capacitance reference current i in the inverter circuit is calculated by the formula (4) Cref The method specifically comprises the following steps:
i Cref ＝L -1 [G 1 (s)·Δu C (s)] (4)
and in (a): l (L) -1 For the Law's inverse transform operator, deltau C (s) is the capacitance voltage deviation Deltau C Laplacian image function, deltau C ＝u C -u Cref ，G 1 (s) is a transfer function of the proportional-integral-vector proportional-integral composite controller, and the functional relation is as follows:
wherein: a=k CP /r C ，b 1 ＝-K CP +r C CK CI +2r C CK CV ，b 2 ＝-25K CP ω 2 +2r C CK CR ，b 3 ＝-25K CI r C Cω 2 ，
c 2 ＝r C ，c 3 ＝25r C (1+r C C)ω 2 Wherein K is CP And K CI Proportional and integral coefficients, K, of proportional and integral control, respectively CV And K CR The proportional coefficient and the gain coefficient of the vector proportional integral control are respectively, wherein K CR ＝8K CV R f /π 2 L，R f For the load resistor, omega is the angular frequency of the voltage reference value output by the Buck-Boost inverter circuit, C is the capacitance value in the Buck-Boost intermediate frequency inverter circuit, and r C The equivalent resistance of the capacitor C, and s is a differential operator.
(4) According to step (3) the capacitive reference current i Cref And real output current i of the Buck-Boost intermediate frequency inverter circuit and direct current voltage at the input side of the Buck-Boost intermediate frequency inverter circuit detected in real time
Actual value u of capacitance voltage C The inductance reference current i in the Buck-Boost intermediate frequency inverter circuit is calculated through a formula (6) Lref ：
Wherein: i is the actual output current of the Buck-Boost intermediate frequency inverter circuit, u C As the actual value of the capacitor voltage,
the direct-current voltage is the direct-current voltage at the input side of the Buck-Boost intermediate-frequency inverter circuit.
(5) The inductive reference current i obtained according to step (4) Lref And the actual value i of the inductor current detected in real time L The inductance reference voltage u is calculated by the formula (7) Lref ：
u Lref ＝L -1 [G 2 (s)·Δi L (s)] (7)
Wherein: l (L) -1 For the Law's inverse transform operator Δi L (s) is the inductor current deviation Δi L Laplace image function, Δi L ＝i L -i Lref ，G 2 (s) is a transfer function of the proportional-integral-vector proportional-integral composite controller, and the functional relation is as follows:
wherein: d, d 1 ＝K LP ，d 2 ＝K LI +2K LV ，d 3 ＝2K LR +25K LP ω 2 ，d 4 ＝25K LI ω 2 ，e 1 ＝L，e 2 ＝r L ，e 3 ＝25Lω 2 ,e 4 ＝25r L ω 2 Wherein K is LP And K LI Proportional and integral coefficients, K, of proportional and integral control, respectively LV And K LR The proportional coefficient and the gain coefficient of the vector proportional integral control are respectively, wherein K CR ＝8K CV R f /π 2 L，R f For the load resistor, omega is the angular frequency of the voltage reference value output by the Buck-Boost inverter circuit, L is the inductance value in the Buck-Boost intermediate frequency inverter circuit, and r L And the equivalent resistance of the inductor L is T is the switching period of a power switch in the Buck-Boost intermediate frequency inverter circuit, and s is a differential operator.
(6) Reference voltage u of the inductor obtained according to step (5) Lref And the detected direct-current voltage at the input side of the Buck-Boost intermediate-frequency inverter circuit
Actual value u of capacitance voltage C The duty ratio d of the corresponding power switch in the Buck-Boost intermediate frequency inverter circuit is calculated through a formula (9):
wherein: u (u) C Is the actual measurement value of the voltage of the capacitor,
is the actual measurement value of the direct current voltage at the input side of the Buck-Boost intermediate frequency inverter circuit.
(7) And (3) controlling a corresponding power switch in the Buck-Boost intermediate frequency inverter circuit according to the duty ratio d and the corresponding switching period obtained in the step (6), namely adjusting the inductance current through the duty ratio, adjusting the capacitance voltage through the inductance current, and finally keeping the capacitance voltage consistent with a reference value of the capacitance voltage, and effectively inhibiting the harmonic content in an output voltage waveform of the Buck-Boost intermediate frequency inverter circuit on the premise of accurately tracking the reference output voltage of the Buck-Boost intermediate frequency inverter circuit by the actual output voltage of the Buck-Boost intermediate frequency inverter circuit, so that the aim of effectively reducing the output voltage ripple of the direct-current regulated power supply is achieved.
Fig. 2 is a schematic block diagram of a control method of a low-ripple adjustable dc voltage-stabilized power supply based on a Buck-Boost intermediate frequency inverter circuit provided by the invention, and further specifically illustrates the control method of the low-ripple adjustable dc voltage-stabilized power supply based on the Buck-Boost intermediate frequency inverter circuit provided by the invention: and respectively constructing corresponding control closed loops for two state variables of capacitor voltage and inductor current in the Buck-Boost intermediate frequency inverter circuit, wherein the capacitor voltage is used as a control outer loop, and the inductor current is used as a control inner loop.
In order to verify the effect of the control method of the low-ripple adjustable direct-current stabilized power supply based on the Buck-Boost intermediate-frequency inverter circuit, and simultaneously to facilitate comparison analysis with the control method in the patent application of the low-ripple adjustable direct-current stabilized power supply and the control method thereof (application number: 202211033703.5) (abbreviated as comparison file), the same main circuit parameters in the comparison file are selected for corresponding comparison analysis research, the main circuit parameters are shown in table 1, and the control parameters corresponding to the control method provided by the invention are shown in table 2.
Table 1 main circuit parameters of dc regulated power supply
| Sequence number | Name of the name | Parameters (parameters) |
| 1 | Inductance L in Buck-Boost intermediate frequency inverter circuit 1 | 7uH |
| 2 | Capacitor C in Buck-Boost intermediate frequency inverter circuit 1 | 9uF |
| 3 | Output filter capacitor C f | 100uF |
| 4 | Load resistor R o | 3kΩ |
TABLE 2 control parameters related to the control method of the present invention
In accordance with the comparison file, the three-phase alternating current input voltage of the direct current stabilized power supply is 380V/50Hz, the output frequency of the Buck-Boost intermediate frequency inverter circuit is 1kHz, and the output direct current reference voltages of the direct current stabilized power supply are respectively 200V, 300V, 400V, 500V, 600V, 700V, 800V, 900V and 1000V, so that corresponding analysis results are obtained by utilizing the control method according to the main circuit parameters shown in the table 1 and the control parameters shown in the table 2, as shown in the table 3, and the analysis results obtained in the comparison file are shown in the table 4.
TABLE 3 analysis results obtained by the control method of the present invention
| Output voltage reference value | Actual output voltage | Deviation of output voltage | Output ripple voltage |
| 200V | 199.99V | 0.01V | 0.052V |
| 300V | 299.98V | 0.02V | 0.054V |
| 400V | 399.98V | 0.02V | 0.055V |
| 500V | 499.98V | 0.02V | 0.057V |
| 600V | 599.97V | 0.03V | 0.057V |
| 700V | 699.97V | 0.03V | 0.058V |
| 800V | 799.96V | 0.04V | 0.058V |
| 900V | 899.96V | 0.04V | 0.059V |
| 1000V | 999.96V | 0.04V | 0.058V |
Fig. 3 is a waveform diagram of an output dc voltage corresponding to the output voltage reference value of 1000V in table 3, and as can be seen from fig. 3, the output voltage waveform has small ripple and high steady-state accuracy.
Table 4 results of analysis obtained in the comparative document
| Output voltage reference value | Actual output voltage | Deviation of output voltage | Output ripple voltage |
| 200V | 199.98V | 0.02V | 0.1V |
| 300V | 299.98V | 0.02V | 0.11V |
| 400V | 399.97V | 0.03V | 0.12V |
| 500V | 499.97V | 0.03V | 0.14V |
| 600V | 599.97V | 0.03V | 0.14V |
| 700V | 699.96V | 0.04V | 0.18V |
| 800V | 799.95V | 0.05V | 0.20V |
| 900V | 899.94V | 0.06V | 0.25V |
| 1000V | 999.93V | 0.07V | 0.30V |
According to tables 3 and 4, compared with the double closed loop PI control method adopted in the comparison document, the control method for the low ripple adjustable direct current stabilized voltage power supply based on the Buck-Boost inverter circuit provided by the invention not only obviously reduces steady state error between actual direct current output voltage and reference output voltage thereof, but also obviously reduces ripple component in the output voltage thereof, thereby effectively improving waveform quality of the output voltage thereof and having better application value.
Claims (10)
1. The control method is characterized in that a capacitance reference current is calculated by adopting a proportional integral-vector proportional integral composite control algorithm to calculate the deviation between capacitance reference voltage and actual voltage in the Buck-Boost inverter circuit, the obtained capacitance reference current is converted into an inductance reference current, and then the proportional integral-vector proportional integral composite control algorithm is continuously adopted to calculate the deviation between the inductance reference current and the actual current to obtain a duty ratio, and a corresponding power switch in the Buck-Boost inverter circuit is controlled according to the obtained duty ratio.
2. The control method of the low-ripple adjustable direct-current stabilized power supply based on the Buck-Boost inverter circuit as claimed in claim 1, comprising the following steps:
(1) Real-time detection of output voltage actual measurement value U of direct-current stabilized power supply DC According to the preset value U of the output voltage of the direct current stabilized power supply DCref Calculating an output voltage reference value u of the three-phase staggered parallel Buck-Boost inverter circuit ref ；
(2) According to the output voltage reference value u of the Buck-Boost inverter circuit obtained in the step (1) ref Obtaining a capacitance reference voltage u in the inverter circuit Cref ；
(3) Detecting the actual voltage u of the capacitor in real time C According to the capacitance reference voltage u obtained in the step (2) Cref Calculate the deviation Deltau C The capacitance reference current i is obtained through the processing of a proportional integral-vector proportional integral composite control algorithm Cref ；
(4) Real-time detection of actual output current i of Buck-Boost inverter circuit and direct-current voltage at input side of Buck-Boost inverter circuit
Actual value u of capacitance voltage C According to the capacitance reference current i obtained in the step (3) Cref The inductance reference current i in the Buck-Boost inverter circuit is calculated Lref ；
(5) Real-time detection of inductor actual current i L The reference current i of the inductor obtained according to the step (4) Lref Calculate the deviation Δi L The inductance reference voltage u is obtained through the processing of a proportional integral-vector proportional integral composite control algorithm Lref ；
(6) According to step (5)The obtained inductance reference voltage u Lref And real-time detection of direct current voltage at input side of Buck-Boost inverter circuit
Actual value u of capacitance voltage C Obtaining the duty ratio d of a corresponding power switch in the Buck-Boost inverter circuit;
(7) And (3) controlling a corresponding power switch in the Buck-Boost inverter circuit according to the duty ratio d and the corresponding switching period obtained in the step (6).
3. The method for controlling a low ripple adjustable dc voltage regulator based on a Buck-Boost inverter according to claim 2, wherein the output voltage reference u of the Buck-Boost inverter in step (1) is calculated by equation (1) ref ：
Wherein: u (U) DCref The reference value of the output voltage of the direct-current stabilized power supply is preset, omega and theta are respectively the angular frequency and the initial phase angle of the reference value of the output voltage of the Buck-Boost inverter circuit, t is a certain moment of operation of the Buck-Boost inverter circuit, and L -1 For the Laplace inverse transformation operator, deltaU(s) is the Laplace image function of the output voltage deviation DeltaU, G 3 (s) is the transfer function of the PI controller.
4. The control method of the low-ripple adjustable direct-current stabilized power supply based on the Buck-Boost inverter circuit according to claim 2, wherein the reference voltage u of the capacitor in the step (2) is calculated by the formula (3) Cref ：
Wherein: k is a direct current bias voltage coefficient, U DCref Is a direct-current regulated power supplyOutput voltage reference value preset value u ref Is the output voltage reference value L of the Buck-Boost inverter circuit -1 For the Laplace inverse transformation operator, deltaU(s) is the Laplace image function of the output voltage deviation DeltaU, G 3 (s) is the transfer function of the PI controller.
5. The control method of the low ripple adjustable direct current regulated power supply based on the Buck-Boost inverter circuit according to claim 3 or 4, wherein the transfer function G of the PI controller is calculated by the formula (2) 3 (s)：
Wherein: k (K) P And K I The proportional coefficient and the integral coefficient are respectively, and s is a differential operator.
6. The control method of the low-ripple adjustable direct-current regulated power supply based on the Buck-Boost inverter circuit according to claim 2, wherein the capacitance reference current i in the inverter circuit in the step (3) is calculated by the formula (4) Cref ：
i Cref ＝L -1 [G 1 (s)·Δu C (s)] (4)
Wherein: l (L) -1 For the Law's inverse transform operator, deltau C (s) is the capacitance voltage deviation Deltau C Laplace image function, G 1 And(s) is a transfer function of the proportional-integral-vector proportional-integral composite controller.
7. The control method of the low-ripple adjustable direct-current stabilized power supply based on the Buck-Boost inverter circuit as claimed in claim 6, wherein the transfer function G 1 (s) is determined by formula (5):
wherein: a=k CP /r C ，b 1 ＝-K CP +r C CK CI +2r C CK CV ，b 2 ＝-25K CP ω 2 +2r C CK CR ，b 3 ＝-25K CI r C Cω 2 ，
c 2 ＝r C ，c 3 ＝25r C (1+r C C)ω 2 Wherein K is CP And K CI Proportional and integral coefficients, K, of proportional and integral control, respectively CV And K CR The proportional coefficient and the gain coefficient of the vector proportional integral control are respectively, wherein K CR ＝8K CV R f /π 2 L，R f Omega is the output voltage angular frequency of the Buck-Boost inverter circuit, C is the capacitance value in the Buck-Boost inverter circuit, and r is the load resistance C The equivalent resistance of the capacitor C, and s is a differential operator.
8. The control method of the low-ripple adjustable direct-current regulated power supply based on the Buck-Boost inverter circuit according to claim 2, wherein the inductance reference current i in the step (4) is obtained by a formula (6) Lref ：
Wherein: i is the actual output current of the Buck-Boost inverter circuit, u C In the form of a capacitor voltage, the capacitor voltage,
the DC voltage at the input side of the Buck-Boost inverter circuit.
9. The control method of the low-ripple adjustable direct-current regulated power supply based on the Buck-Boost inverter circuit according to claim 2, wherein the inductance in the step (5) is obtained by the formula (7)Reference voltage u Lref ：
u Lref ＝L -1 [G 2 (s)·Δi L (s)] (7)
Wherein: l (L) -1 For the Law's inverse transform operator Δi L (s) is the inductor current deviation Δi L Laplace image function, Δi L ＝i L -i Lref ，G 2 And(s) is a transfer function of the proportional-integral-vector proportional-integral composite controller.
10. The control method of the low ripple adjustable direct current stabilized power supply based on the Buck-Boost inverter circuit according to claim 9, wherein the transfer function G of the proportional-integral-vector proportional-integral composite controller is calculated by the formula (8) 2 (s)：
Wherein: d, d 1 ＝K LP ，d 2 ＝K LI +2K LV ，d 3 ＝2K LR +25K LP ω 2 ，d 4 ＝25K LI ω 2 ，e 1 ＝L，e 2 ＝r L ，e 3 ＝25Lω 2 ,e 4 ＝25r L ω 2 Wherein K is LP And K LI Proportional and integral coefficients, K, of proportional and integral control, respectively LV And K LR The proportional coefficient and the gain coefficient of the vector proportional integral control are respectively, wherein K CR ＝8K CV R f /π 2 L，R f Omega is the output voltage angular frequency of the Buck-Boost inverter circuit, L is the inductance value in the Buck-Boost inverter circuit, and r is the load resistance L And the equivalent resistance of the inductor L is T is the switching period of a power switch in the Buck-Boost inverter circuit, and s is a differential operator.
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| CN117526741A (en) * | 2024-01-08 | 2024-02-06 | 湖南科技大学 | Control method of single-phase alternating-current input adjustable direct-current stabilized voltage supply |
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