CN115313899B - Low-ripple adjustable direct-current stabilized power supply and control method thereof - Google Patents
Low-ripple adjustable direct-current stabilized power supply and control method thereof Download PDFInfo
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- CN115313899B CN115313899B CN202211033703.5A CN202211033703A CN115313899B CN 115313899 B CN115313899 B CN 115313899B CN 202211033703 A CN202211033703 A CN 202211033703A CN 115313899 B CN115313899 B CN 115313899B
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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
- H02M7/42—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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/539—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
- H02M7/5395—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
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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
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a low-ripple adjustable direct-current stabilized power supply and a control method thereof. The control method sequentially obtains the output reference voltage of the Buck-Boost intermediate frequency inverter circuit of the direct-current stabilized power supply, the reference voltage of a capacitor in the Buck-Boost intermediate frequency inverter circuit, the reference current of the capacitor, the reference current of an inductor, the reference voltage of the inductor and the corresponding duty ratio of each power switch, so that the actual output voltage of the direct-current stabilized power supply is consistent with the preset output reference voltage through controlling the corresponding power switch in the Buck-Boost intermediate frequency inverter circuit. The invention has the characteristics of simple topological structure, small volume, random adjustable output voltage, small output voltage ripple and the like.
Description
Technical Field
The invention relates to the field of adjustable direct current stabilized power supplies, in particular to a low-ripple adjustable direct current stabilized power supply and a control method thereof.
Background
The DC stabilized power supply is widely applied in various fields such as industrial and agricultural production, national defense, scientific research and the like, and the performance indexes such as ripple coefficient, stability and the like of the output voltage are directly related to the application effect of the DC stabilized power supply in the related fields, so that the development of the research on low ripple and high stability of the DC stabilized power supply is of great significance. At present, a great deal of research has been carried out on low-ripple direct-current stabilized power supplies at home and abroad, and various topological structures such as direct-current stabilized power supplies based on voltage doubling rectification and direct-current stabilized power supplies based on multiphase staggered parallel half-bridge inverters are proposed, and although certain effects are achieved, the problems of complex structure, large volume and the like exist, so that adverse effects are caused to popularization and application of the low-ripple direct-current stabilized power supplies.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a low-ripple adjustable direct current stabilized power supply and a control method thereof.
The invention provides a low ripple adjustable DC stabilized power supply, which concretely comprises: the three-phase PWM rectification circuit, the three-phase staggered parallel Buck-Boost intermediate frequency inverter circuit and the three-phase bridge type uncontrollable rectification circuit.
Preferably, the three-phase PWM rectifying circuit adopts a three-phase bridge type full-control rectifying circuit for rectifying a three-phase input ac voltage into a PWM modulated dc voltage; specifically, the three-phase PWM rectifying circuit comprises three groups of parallel bridge arms, each group of bridge arms is connected with the collector electrode of the second power switch through the emitting stage of the first power switch, the three-phase input alternating current is sequentially connected with the midpoints of the three groups of bridge arms respectively, the collectors of the first power switches of the three groups of bridge arms are connected to serve as the positive electrode end of the output direct current voltage of the three-phase PWM rectifying circuit, and the emitting stage of the second power switch of the three groups of bridge arms is connected to serve as the negative electrode end of the output direct current voltage of the three-phase PWM rectifying circuit.
More preferably, the power switch is selected from IGBTs.
Preferably, the three-phase staggered parallel Buck-Boost intermediate frequency inverting circuit is formed by three 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; specifically, the three-phase staggered parallel Buck-Boost intermediate frequency inverse circuit is formed by connecting three groups of Buck-Boost voltage-boosting circuits with the same structure, wherein the phases of the three groups of Buck-Boost voltage-boosting circuits are staggered by 120 degrees in sequence; each group of Buck-Boost circuit comprises a third power switch, a fourth power switch, an inductor and a capacitor, wherein the drain electrode of the third power switch is connected with the positive electrode of the output direct current side of the three-phase PWM rectifying circuit, the source electrode of the third power switch is connected with the drain electrode of the fourth power switch, one end of the inductor is connected between the third power switch and the fourth power switch, the other end of the inductor is connected with the negative electrode of the output direct current side of the three-phase PWM rectifying circuit, the source electrode of the fourth power switch is connected with one end of the capacitor, and the other end of the capacitor is connected with the other end of the inductor.
More preferably, the power switch is selected from a MOS transistor.
Preferably, the three-phase bridge type uncontrollable rectifying circuit is a capacitor filtering three-phase bridge type uncontrollable rectifying circuit, and is used for rectifying the three-phase symmetrical intermediate frequency sinusoidal alternating voltage output by the three-phase staggered parallel Buck-Boost intermediate frequency inverting circuit into direct current voltage; specifically, the three-phase bridge type uncontrollable rectifying circuit comprises a plurality of diodes, the diodes are connected in series to form a group of rectifying diode assemblies, the middle points of each group of rectifying diode assemblies are respectively connected with the output ends of a group of Buck-Boost Buck circuits of the three-phase staggered parallel Buck-Boost intermediate frequency inverting circuit, the cathodes of one diode of each group of rectifying diode assemblies are connected together to serve as the positive electrode end of rectifying output of the three-phase bridge type uncontrollable rectifying circuit, the anodes of the other diode of each group of rectifying diode assemblies are connected together to serve as the negative electrode end of rectifying output of the three-phase bridge type uncontrollable rectifying circuit, and the positive electrode end and the negative electrode end are respectively connected with the positive electrode and the negative electrode of the filter capacitor.
The control method provided by the invention comprises the following steps: according to preset DC output reference voltage U dc-ref At the same time, the direct current output actual voltage U is detected in real time dc Obtaining the output reference voltage u of the Buck-Boost intermediate frequency inverter circuit of the direct current stabilized power supply ref The method comprises the steps of carrying out a first treatment on the surface of the According to the reference voltage u ref The double closed-loop control algorithm processing based on PI control is adopted for the Buck-Boost intermediate frequency inverter circuit, and the reference voltage u of the capacitor in the Buck-Boost intermediate frequency inverter circuit is sequentially calculated C-ref Reference current i of capacitor C-ref Reference current i of inductor L-ref Reference voltage u of inductor L-ref And the duty ratio d corresponding to each power switch, so that the actual output voltage of the direct-current stabilized power supply is kept consistent with the preset output reference voltage by controlling the corresponding power switch in the Buck-Boost intermediate-frequency inverter circuit. The method comprises the following specific steps:
step S1) outputting a reference voltage U according to the direct current of the direct current stabilized power supply dc-ref And actually outputs a DC voltage U dc The output reference voltage u of the Buck-Boost intermediate frequency inverter circuit is obtained through the processing of a correlation algorithm ref ；
Step S2) outputting the reference voltage u according to the step S1) ref Obtaining a reference voltage u of a capacitor in the Buck-Boost intermediate frequency inverter circuit C-ref ；
Step S3) the reference voltage u obtained according to step S2) C-ref At the same time, the actual value u of the capacitor voltage is detected in real time C Processing the obtained deviation value by a PI control algorithm to obtain a reference current i of a capacitor in the Buck-Boost intermediate frequency inverter circuit C-ref ；
Step S4) the reference current i obtained according to step S3) C-ref At the same time, the actual output current i of the Buck-Boost intermediate frequency inverter circuit and the output direct-current voltage of the three-phase PWM rectifying circuit are detected in real timeActual value u of capacitance voltage C Obtaining reference current i of inductor in Buck-Boost intermediate frequency inverter circuit L-ref ；
Step S5) the reference current i obtained according to step S4) L-ref Simultaneously, the actual value i of the inductance current is detected in real time L Processing the obtained deviation value by a PI control algorithm to obtain the reference voltage u of the inductor in the Buck-Boost intermediate frequency inverter circuit L-ref ；
Step S6) the reference voltage u obtained according to step S5) L-ref And real-time detected PWM rectified output voltageActual value u of capacitance voltage C Obtaining the duty ratio d of a corresponding power switch in the Buck-Boost intermediate frequency inverter circuit;
and S7) 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 S6), so that the output voltage of the Buck-Boost intermediate frequency inverter circuit accurately tracks the reference voltage of the Buck-Boost intermediate frequency inverter circuit, and the output direct-current voltage of the three-phase bridge type uncontrollable rectifying circuit is consistent with the set value of the three-phase bridge type uncontrollable rectifying circuit.
Preferably, in step S1), the output reference voltage u of the Buck-Boost intermediate frequency inverter circuit ref The reference voltage u ref Is three-phase symmetrical sinusoidal medium-frequency alternating voltage, and takes any one phase asFor example, it outputs a reference voltage u ref The determination method comprises the following steps:
step S1-1) outputting a reference voltage U according to the set direct current dc-ref Obtaining an initial value U of the amplitude of the output reference voltage of the Buck-Boost intermediate frequency inverter circuit through a formula (1) m ：
Step S1-2) detecting the output DC voltage actual value U of the DC stabilized power supply in real time dc Calculating the actual value U by the formula (2) dc With reference voltage U dc-ref Deviation deltau between:
ΔU＝U dc-ref -U dc (2)
step S1-3) obtaining a compensation value delta U of the amplitude of the output reference voltage of the Buck-Boost intermediate frequency inverter circuit by adopting a PI control algorithm according to the deviation delta U obtained in the step S1-2) m ；
Step S1-4) obtaining the output reference voltage amplitude U after the compensation of the Buck-Boost intermediate frequency inverter circuit according to the formula (3) mref ：
Step S1-5) the compensated output reference voltage amplitude U obtained according to step S1-4) mref Obtaining the output reference voltage u of the Buck-Boost intermediate frequency inverter circuit through a formula (4) ref ：
u ref ＝U mref sin(ωt+φ) (4)
Wherein: omega and phi are the angular frequency and initial phase angle of the output reference voltage of the intermediate frequency inverter circuit respectively, and t is a certain moment of operation of the intermediate frequency inverter circuit.
Preferably, the step S2) is the output reference voltage u of the Buck-Boost intermediate frequency inverter circuit obtained according to the step S1) ref Obtaining the reference voltage u of the capacitor in the Buck-Boost intermediate frequency inverter circuit through a formula (5) C-ref ：
u C-ref ＝1.5×U mref +u ref (5)
Wherein: u (U) mref To compensate the amplitude of the output reference voltage.
Preferably, step S4) obtains a reference value i of the inductor current in the Buck-Boost intermediate frequency inverter circuit through a formula (6) L-ref ：
Wherein:outputting direct-current voltage for the three-phase PWM rectifying circuit, u C I is the actual value of the capacitance voltage C-ref And i is the actual output current of the Buck-Boost intermediate frequency inverter circuit.
Preferably, step S6) obtains the duty ratio d of the corresponding power switch in the Buck-Boost intermediate frequency inverter circuit through formula (7):
in the method, in the process of the invention,outputting direct-current voltage for the three-phase PWM rectifying circuit, u C As the actual value of the capacitance voltage, u L-ref Is the reference voltage of the inductor.
Compared with the prior art, the topology structure of the low-ripple adjustable direct-current stabilized power supply and the control method thereof provided by the invention comprises a three-phase PWM (pulse-width modulation) rectifying circuit, a three-phase staggered parallel Buck-Boost intermediate-frequency inverter circuit and a three-phase bridge type uncontrollable rectifying circuit, and the specific topology structure is greatly simplified. The three-phase PWM rectification circuit is used for rectifying three-phase input alternating current into PWM-modulated direct current voltage, the three-phase staggered parallel Buck-Boost intermediate frequency inversion circuit is used for inverting the PWM-modulated direct current voltage output by the three-phase PWM rectification circuit into three-phase symmetrical intermediate frequency sinusoidal alternating current voltage with randomly adjustable amplitude and frequency, and the three-phase bridge type uncontrollable rectification circuit is used for rectifying the three-phase symmetrical intermediate frequency sinusoidal alternating current voltage output by the three-phase staggered parallel Buck-Boost intermediate frequency inversion circuit into direct current voltage. The control method of the direct current stabilized power supply comprises the following steps: according to the set direct current output reference voltage, the actual direct current output voltage value is detected in real time, the output reference voltage of the Buck-Boost intermediate frequency inverter circuit is obtained through processing of a related algorithm, and according to the reference voltage, the Buck-Boost intermediate frequency inverter circuit is processed by adopting a double closed loop control algorithm based on PI control, so that the actual output voltage accurately tracks the reference voltage, and the control target that the actual output voltage of the direct current stabilized power supply is consistent with the set value is achieved.
The three-phase staggered parallel Buck-Boost intermediate frequency inverter circuit in the topological structure can realize the random adjustment of the amplitude and the frequency of the output voltage, so that the voltage adjusting link of adjusting the output voltage level by adopting a transformer in the existing adjustable direct current stabilized power supply topological structure is omitted, and the volume and the cost of the power supply device are reduced. The invention provides the method for outputting the reference voltage u to the Buck-Boost intermediate frequency inverter circuit according to the deviation between the actual output DC voltage of the DC stabilized power supply and the reference value thereof ref The method for compensating the amplitude achieves the control target that the actual output direct-current voltage of the direct-current stabilized power supply is consistent with the reference value thereof, and has remarkable progress.
Drawings
FIG. 1 is a diagram of a main circuit topology of a low ripple adjustable DC regulated power supply provided by the invention;
FIG. 2 is a flow chart of a control method of the low ripple adjustable DC regulated power supply provided by the invention;
FIG. 3 is a schematic block diagram of a low ripple adjustable DC regulated power supply control system according to the present invention;
FIG. 4 is a schematic block diagram of a control system of the three-phase staggered parallel Buck-Boost intermediate frequency inverter circuit provided by the invention;
fig. 5 is a topology diagram of a main circuit of a dc power supply based on a three-phase half-bridge LLC resonant circuit commonly used at present.
Detailed Description
Referring to fig. 1, a topology structure diagram of a main circuit of a low ripple adjustable dc voltage-stabilized power supply is provided in the present invention. 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, wherein the emitting stages of the power switches S1, S3 and S5 are respectively connected with the collecting electrodes of the power switches S2, S4 and S6 to form three groups of bridge arms respectively, the three groups of bridge arms are connected in parallel to form the three-phase PWM rectifying circuit, each phase of three-phase input alternating current is respectively connected with the midpoints of the three groups of bridge arms in sequence, the collecting electrodes of the power switches S1, S3 and S5 are connected to serve as positive ends of direct current voltage output by the PWM rectifying circuit, and the emitting stages of the power switches S2, S4 and S6 are connected to serve as negative ends of direct current voltage output by the PWM rectifying circuit.
The three-phase staggered parallel Buck-Boost intermediate frequency inverse circuit is formed by 3 groups of Buck-Boost Buck circuits with the same structure in a phase staggered parallel mode, the three groups of Buck-Boost Buck circuits are identical in structure, and in the embodiment, the phase staggered parallel mode means that reference voltages of the three groups of circuits are sequentially staggered in phase when in control, and are sequentially staggered by 120 degrees under the condition of three-phase symmetry. Taking a first group of circuits as an example, the first group of circuits comprises full-control power switches Q1 and Q2, an inductor L1 and a capacitor C1; the full-control power switch is to adopt an MOS tube; the drain electrode of the Q1 pipe is connected with the positive electrode of the output direct current side of the PWM rectifying circuit, the source electrode of the Q1 pipe is connected with one end of an inductor L1 and the drain electrode of the Q2 pipe, the other end of the inductor L1 is connected with the negative electrode of the output direct current side of the PWM rectifying circuit, the source electrode of the Q2 pipe is connected with one end of a capacitor C1, and the other end of the capacitor C1 is connected with the other end of the inductor L1.
The three-phase uncontrollable rectifying circuit consists of 6 rectifying diodes and 1 filter capacitor, wherein anodes of the diodes D1, D3 and D5 are respectively connected with cathodes of the diodes D2, D4 and D6 and are respectively connected with output ends of the three-phase staggered parallel Buck-Boost intermediate frequency inverter circuit, and the diodes D1, D3,The cathode of D5 is connected together to be used as the positive electrode end of the rectification output, the anodes of the diodes D2, D4 and D6 are connected together to be used as the negative electrode end of the rectification output, and the positive electrode end and the negative electrode end of the rectification output are respectively connected with the filter capacitor C f Is a positive electrode and a negative electrode of the battery.
Referring to fig. 2, 3 and 4, a flow chart of the control method of the low-ripple adjustable dc voltage-stabilized power supply and a schematic block diagram of the control system of the three-phase interleaved parallel Buck-Boost intermediate frequency inverter circuit are provided. With reference to fig. 2 to fig. 4, the control method of the low ripple adjustable dc regulated power supply provided by the present invention is further specifically described:
step S1) outputting a reference voltage U according to the set direct current dc-ref At the same time, the actual output DC voltage U is detected in real time dc (U dc The output reference voltage u of the Buck-Boost intermediate frequency inverter circuit is obtained by calculating the output voltage of the three-phase bridge type uncontrollable rectifier circuit, namely the final output voltage of the direct current stabilized power supply circuit provided by the invention through the steps S1-1 to S1-5 ref (u ref Is three-phase symmetrical sinusoidal intermediate frequency alternating voltage):
step S1-1) outputting a reference voltage U according to the set direct current dc-ref Obtaining an initial value U of the amplitude of the output reference voltage of the Buck-Boost intermediate frequency inverter circuit m The method comprises the steps of carrying out a first treatment on the surface of the The calculation formula is as follows:
step S1-2) detecting the actual value U of the DC output voltage in real time dc And calculates the actual value and its reference voltage U dc-ref Deviation deltau between; the calculation formula is as follows:
ΔU＝U dc-ref -U dc (2)
step S1-3) adopting a PI control algorithm to process the deviation DeltaU according to the deviation DeltaU obtained in the step S1-2) to obtain a compensation value DeltaU of the amplitude of the output reference voltage of the Buck-Boost intermediate frequency inverter circuit m ；
Step S1-4) step S1-3The compensation value DeltaU m For the initial value U obtained in step S1-1) m Compensating to obtain a reference output voltage amplitude U after compensation of the Buck-Boost intermediate frequency inverter circuit mref The method comprises the steps of carrying out a first treatment on the surface of the The calculation formula is as follows:
step S1-5) the compensated reference output voltage amplitude U obtained according to step S1-4) mref Obtaining the reference output voltage u of the three-phase Buck-Boost intermediate frequency inverter circuit ref The method comprises the steps of carrying out a first treatment on the surface of the The calculation formula is as follows:
u ref ＝U mref sin(ωt+φ) (4)
wherein: omega and phi are the angular frequency and initial phase angle of the output reference voltage of the intermediate frequency inverter circuit respectively, and t is a certain moment of operation of the intermediate frequency inverter circuit.
Step S2) outputting reference voltage u according to the obtained Buck-Boost intermediate frequency inverter circuit ref The reference voltage u of the capacitor in the Buck-Boost intermediate frequency inverter circuit is obtained through correlation operation processing C-ref The method comprises the steps of carrying out a first treatment on the surface of the The calculation formula is as follows:
u C-ref ＝1.5×U mref +u ref (5)
wherein: u (U) mref For the compensated reference output voltage amplitude, the constant 1.5 is the optimal value under the premise of guaranteeing the output voltage waveform quality.
Step S3) according to the reference voltage u of the obtained capacitor C-ref Simultaneously, the actual value u of the capacitor voltage is detected in real time C The obtained deviation is processed by PI control algorithm to obtain the reference current i of the capacitor C-ref ；
Step S4) according to the reference current i of the obtained capacitor C-ref At the same time, the actual output current i of the Buck-Boost intermediate frequency inverter circuit and the output direct-current voltage of the three-phase PWM rectifying circuit are detected in real timeActual value u of capacitance voltage C The reference current i of the inductor in the Buck-Boost intermediate frequency inverter circuit is obtained through correlation operation processing L-ref The method comprises the steps of carrying out a first treatment on the surface of the The calculation formula is as follows:
wherein:outputting direct-current voltage for the three-phase PWM rectifying circuit, u C I is the actual value of the capacitance voltage C-ref And i is the actual output current of the Buck-Boost intermediate frequency inverter circuit.
Step S5) reference current i of the inductor obtained according to step S4) L-ref At the same time, real current i of the inductor is detected in real time L The obtained deviation is processed by PI control algorithm to obtain the reference voltage u of the inductor L-ref ；
Step S6) reference voltage u of the inductor obtained according to step S5) L-ref And the detected three-phase PWM rectification circuit outputs DC voltageActual value u of capacitance voltage C Obtaining the duty ratio d of a corresponding power switch in the Buck-Boost intermediate frequency inverter circuit through correlation operation; the calculation formula is as follows:
wherein:outputting direct-current voltage for the three-phase PWM rectifying circuit, u C As the actual value of the capacitance voltage, u L-ref Is the reference voltage of the inductor.
Step S7) according to the obtained duty ratio d and the corresponding switching period, corresponding power switches in the Buck-Boost intermediate frequency inverter circuit are controlled, so that the output voltage of the Buck-Boost intermediate frequency inverter circuit accurately tracks the reference voltage of the Buck-Boost intermediate frequency inverter circuit, and the output direct current voltage of the three-phase bridge type uncontrollable rectifying circuit is kept consistent with the set value of the three-phase bridge type uncontrollable rectifying circuit, thereby achieving the purpose of accurately controlling the direct current output voltage of the three-phase bridge type uncontrollable rectifying circuit.
In order to verify the effects of the low-ripple adjustable direct-current regulated power supply and the control method thereof provided by the invention, the main circuit parameters are shown in the table 1, the three-phase alternating-current input voltage is 380V/50Hz, the output frequency of the Buck-Boost intermediate-frequency inverter circuit is 1kHz, and the output direct-current reference voltage u is arbitrarily taken dc-ref And respectively 200V, 300V, 400V, 500V, 600V, 700V, 800V, 900V and 1000V, constructing corresponding direct current stabilized power supply circuits according to the parameters, and obtaining corresponding results as shown in table 2.
Table 1 main circuit parameter table of dc stabilized power supply
TABLE 2 simulation results of DC stabilized power supply output voltage
Therefore, the low-ripple adjustable direct current stabilized power supply and the control method thereof provided by the invention have the advantages that the actual output voltage is basically consistent with the set reference voltage, and the output voltage ripple is small.
In order to further verify the effect of the low-ripple adjustable direct current stabilized power supply provided by the invention, the low-ripple adjustable direct current stabilized power supply is compared and analyzed with the direct current stabilized power supply based on the three-phase half-bridge LLC resonant circuit commonly used at present. The topology structure of the main circuit of the direct current stabilized power supply based on the three-phase half-bridge LLC resonant circuit is shown in fig. 5, and the parameters of the main circuit are shown in table 3.
Table 3 main circuit parameters of dc stabilized power supply based on three-phase half-bridge LLC resonant circuit
In the two DC stabilized voltage power supplies, the three AC input voltages are 380V/50Hz, the output frequency of the intermediate frequency inverter circuit is 1kHz, and the DC output reference voltage U of the two power supplies is arbitrarily selected dc-ref 1000V, the corresponding results are shown in table 4:
TABLE 4 output results of two Power supplies
Therefore, the output DC voltage stabilizing power supply topological structure provided by the invention is obviously smaller than the traditional DC voltage stabilizing power supply based on the three-phase half-bridge LLC resonant circuit, and therefore, the DC voltage stabilizing power supply topological structure provided by the invention has better output voltage quality.
Meanwhile, the main circuit topology structures of the low-ripple adjustable direct-current stabilized power supply and the traditional direct-current stabilized power supply based on the three-phase half-bridge LLC resonant circuit are compared and analyzed, and the number of components required in the main circuit topology structures of the two power supplies is shown in table 5:
table 5 number of components required for two power supply main circuit topologies
As can be seen from Table 5, compared with the traditional direct current stabilized power supply based on the three-phase half-bridge LLC resonant circuit, the low-ripple adjustable direct current stabilized power supply provided by the invention has the advantages that 3 intermediate frequency transformers, 2 capacitors and 6 rectifier diodes are reduced, so that the topological structure of the direct current stabilized power supply provided by the invention is greatly simplified.
In addition, the low-ripple adjustable direct-current regulated power supply provided by the invention can realize any adjustment of output voltage, namely, the output voltage can be randomly adjusted in a larger range according to the requirement; the output voltage of the traditional direct-current stabilized power supply based on the three-phase half-bridge LLC resonant circuit is fixed, and the output voltage is regulated only by changing the transformation ratio of a transformer, so that the voltage regulation is difficult.
In summary, the low-ripple adjustable direct current stabilized power supply and the control method thereof provided by the invention have the advantages of random output voltage adjustment, small output voltage ripple, simple main circuit topology structure and the like.
Claims (6)
1. The low-ripple adjustable direct-current stabilized power supply is characterized by comprising 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 which are sequentially connected in series;
the three-phase PWM rectifying circuit adopts a three-phase bridge type full-control rectifying circuit 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 three 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 a capacitor filtering three-phase bridge type uncontrollable rectifying circuit and is used for rectifying the three-phase symmetrical intermediate frequency sinusoidal alternating voltage output by the three-phase staggered parallel Buck-Boost intermediate frequency inverting circuit into direct current voltage;
the control method of the low-ripple adjustable direct current stabilized power supply comprises the following steps:
step S1) outputting a reference voltage U according to the direct current of the direct current stabilized power supply dc-ref And actually outputs a DC voltage U dc Obtaining the output reference voltage u of the Buck-Boost intermediate frequency inverter circuit ref The method comprises the steps of carrying out a first treatment on the surface of the Wherein the output reference voltage u of each phase ref The method is calculated by the following steps:
step S1-1) outputting a reference voltage U according to the set direct current dc-ref Obtaining an initial value U of the amplitude of the output reference voltage of the Buck-Boost intermediate frequency inverter circuit through a formula (1) m ：
Step S1-2) detecting the output DC voltage actual value U of the DC stabilized power supply in real time dc Calculating the actual value U by the formula (2) dc With reference voltage U dc-ref Deviation deltau between:
ΔU＝U dc-ref -U dc (2)
step S1-3) obtaining a compensation value delta U of the amplitude of the output reference voltage of the Buck-Boost intermediate frequency inverter circuit by adopting a PI control algorithm according to the deviation delta U obtained in the step S1-2) m ；
Step S1-4) obtaining the output reference voltage amplitude U after the compensation of the Buck-Boost intermediate frequency inverter circuit according to the formula (3) mref ：
Step S1-5) the compensated output reference voltage amplitude U obtained according to step S1-4) mref The output reference voltage u of the Buck-Boost intermediate frequency inverter circuit is obtained through a formula (4) ref ：
u ref ＝U mref sin(ωt+φ) (4)
Wherein: omega and phi are the angular frequency and initial phase angle of the output reference voltage of the intermediate frequency inverter circuit respectively, and t is a certain moment of operation of the intermediate frequency inverter circuit;
step S2) outputting the reference voltage u according to the step S1) ref Obtaining a reference voltage u of a capacitor in the Buck-Boost intermediate frequency inverter circuit C-ref ；
Step S3) the reference voltage u obtained according to step S2) C-ref At the same time, the actual value u of the capacitor voltage is detected in real time C Processing the obtained deviation value by a PI control algorithm to obtain a reference current i of a capacitor in the Buck-Boost intermediate frequency inverter circuit C-ref ；
Step S4) the reference current i obtained according to step S3) C-ref At the same time, the actual output current i of the Buck-Boost intermediate frequency inverter circuit and the output direct-current voltage of the three-phase PWM rectifying circuit are detected in real timeActual value u of capacitance voltage C Obtaining reference current i of inductor in Buck-Boost intermediate frequency inverter circuit L-ref ；
Step S5) the reference current i obtained according to step S4) L-ref Simultaneously, the actual value i of the inductance current is detected in real time L Processing the obtained deviation value by a PI control algorithm to obtain the reference voltage u of the inductor in the Buck-Boost intermediate frequency inverter circuit L-ref ；
Step S6) the reference voltage u obtained according to step S5) L-ref And real-time detected PWM rectified output voltageActual value u of capacitance voltage C Obtaining the duty ratio d of a corresponding power switch in the Buck-Boost intermediate frequency inverter circuit;
and S7) 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 S6), so that the output voltage of the Buck-Boost intermediate frequency inverter circuit accurately tracks the reference voltage of the Buck-Boost intermediate frequency inverter circuit, and the output direct-current voltage of the three-phase bridge type uncontrollable rectifying circuit is consistent with the set value of the three-phase bridge type uncontrollable rectifying circuit.
2. The low-ripple adjustable direct current stabilized power supply according to claim 1, wherein the three-phase PWM rectifying circuit comprises three groups of parallel bridge arms, each group of bridge arms is connected with the collector of the second power switch by the emitter of the first power switch, the three-phase input alternating current is sequentially connected with the midpoints of the three groups of bridge arms respectively, the collectors of the first power switches of the three groups of bridge arms are connected to serve as the positive terminal of the output direct current voltage of the three-phase PWM rectifying circuit, and the emitter of the second power switch of the three groups of bridge arms is connected to serve as the negative terminal of the output direct current voltage of the three-phase PWM rectifying circuit.
3. The low ripple adjustable dc regulated power supply of claim 2, wherein the power switch is selected from IGBTs.
4. The low-ripple adjustable direct-current stabilized power supply according to claim 1, wherein the three-phase staggered parallel Buck-Boost intermediate-frequency inverter circuit is formed by connecting three groups of Buck-Boost voltage-boosting circuits with the same structure and staggered 120 degrees in sequence in parallel; each group of Buck-Boost circuit comprises a third power switch, a fourth power switch, an inductor and a capacitor, wherein the drain electrode of the third power switch is connected with the positive electrode of the output direct current side of the three-phase PWM rectifying circuit, the source electrode of the third power switch is connected with the drain electrode of the fourth power switch, one end of the inductor is connected between the third power switch and the fourth power switch, the other end of the inductor is connected with the negative electrode of the output direct current side of the three-phase PWM rectifying circuit, the source electrode of the fourth power switch is connected with one end of the capacitor, and the other end of the capacitor is connected with the other end of the inductor.
5. The low ripple adjustable dc regulated power supply of claim 4, wherein the power switch is selected from the group consisting of MOS transistors.
6. The low-ripple adjustable direct current stabilized power supply according to claim 1, wherein the three-phase bridge type uncontrollable rectifying circuit comprises a plurality of diodes, the diodes are connected in series to form a group of rectifying diode assemblies, the middle point of each group of rectifying diode assemblies is respectively connected with the output end of a group of Buck-Boost circuits of the three-phase staggered parallel Buck-Boost intermediate frequency inverting circuit, the cathodes of one diode of each group of rectifying diode assemblies are connected together to serve as the positive electrode end of the rectifying output of the three-phase bridge type uncontrollable rectifying circuit, the anodes of the other diode of each group of rectifying diode assemblies are connected together to serve as the negative electrode end of the rectifying output of the three-phase bridge type uncontrollable rectifying circuit, and the positive electrode end and the negative electrode end are respectively connected with the positive electrode and the negative electrode of the filter capacitor.
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| CN117595623B (en) * | 2023-11-22 | 2024-09-10 | 湖南科技大学 | Control parameter self-tuning method for low-ripple adjustable direct-current stabilized power supply |
| CN117294161B (en) * | 2023-11-24 | 2024-02-09 | 湖南科技大学 | Buck-Boost inverter main circuit parameter stability domain determination method based on intermediate frequency state |
| CN117526741B (en) * | 2024-01-08 | 2024-03-29 | 湖南科技大学 | Control method of single-phase alternating-current input adjustable direct-current stabilized voltage supply |
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