CN111245239A - Voltage stabilization control method and system for three-level Boost circuit input voltage fluctuation - Google Patents

Voltage stabilization control method and system for three-level Boost circuit input voltage fluctuation Download PDF

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CN111245239A
CN111245239A CN202010217955.8A CN202010217955A CN111245239A CN 111245239 A CN111245239 A CN 111245239A CN 202010217955 A CN202010217955 A CN 202010217955A CN 111245239 A CN111245239 A CN 111245239A
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voltage
loop
value
output
boost circuit
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CN111245239B (en
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张润泽
何俊鹏
刘皓
郝帅
曹虎
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CRRC Qingdao Sifang Rolling Stock Research Institute Co Ltd
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CRRC Qingdao Sifang Rolling Stock Research Institute 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
    • H02M1/0022—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters the disturbance parameters being input voltage fluctuations

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  • Dc-Dc Converters (AREA)

Abstract

The invention relates to a voltage stabilization control method and a system for three-level Boost circuit input voltage fluctuation, wherein the method comprises the following steps: if the input voltage drops, judging whether the output voltage is less than or equal to a given minimum voltage target value; if the output voltage is less than or equal to the given minimum voltage target value, introducing open-loop feedforward voltage stabilization control, and calculating a PI (proportional integral) regulation output value of a switching tube duty ratio replacement voltage loop; if the input voltage is raised, judging whether the output voltage is greater than or equal to a given maximum voltage target value; if the output voltage is larger than or equal to the given maximum voltage target value, introducing open-loop feedforward voltage stabilization control, and calculating the duty ratio of the switching tube to replace the voltage loop PI for regulating output; and if the output voltage is recovered to a steady-state value, the open-loop feedforward voltage stabilization control is quitted, and the closed-loop control is recovered. The method introduces open-loop feedforward voltage stabilization control, effectively eliminates the influence of large-range rapid change of input voltage on output voltage aiming at the sudden change of the input voltage, and accelerates the dynamic response of a system.

Description

Voltage stabilization control method and system for three-level Boost circuit input voltage fluctuation
Technical Field
The invention belongs to the technical field of Boost chopper circuit control, and particularly relates to a voltage stabilization control method and system for three-level Boost circuit input voltage fluctuation.
Background
In the existing three-level Boost circuit control technology, a voltage outer ring is formed by collecting output voltage and comparing the output voltage with a voltage target value, in order to achieve the purpose of balancing the midpoint potential of an output capacitor at a direct current side, a voltage-sharing ring is added in the control, the output of the voltage-sharing ring is superposed on double-ring output, and finally, the pulse width is output through a PWM generator to control the action of a switching device. The control method mainly comprises a three-loop control form of a voltage outer loop, a current inner loop and a grading ring as shown in figure 1 (a); or a voltage outer ring, a two-ring control of the grading ring, as shown in fig. 1 (b). The working process is as follows: collecting voltage U on output capacitor C11Voltage U on output capacitor C22Making and sending voltage outer ring as feedback value Uo_feedback(ii) a Taking the voltage loop PI regulation output value or the current loop PI regulation output value as a PWM given base value D_vol(ii) a Collecting voltage U on output capacitor C11Voltage U on output capacitor C22Making difference and sending the difference into a grading ring as a feedback value Ub_feedback(ii) a And superposing the regulating output value of the equalizing ring PI and the regulating output value of the voltage ring PI or the regulating output value of the current ring PI, and sending the superposed regulating output values into a PWM comparator to generate a driving signal to control the switching tubes Q1 and Q2.
When the input voltage of the three-level Boost circuit does not fluctuate in a large range, the control mode can maintain the output voltage to be stable near a given value. However, when the input voltage changes rapidly, i.e. the duty ratio of the switching tube needs to change rapidly, the above method cannot ensure the dynamic response of the system.
Therefore, there is a need for improvement on the basis of the above-mentioned conventional control method of the three-level Boost circuit, so that the dynamic response of the system can be ensured when the input voltage changes rapidly.
Disclosure of Invention
The invention provides a voltage stabilization control method and a voltage stabilization control system aiming at the input voltage fluctuation of a three-level Boost circuit on the basis of the control method of the Boost circuit.
In order to achieve the above object, the present invention provides a voltage stabilization control method for input voltage fluctuation of a three-level Boost circuit, comprising:
if the input voltage of the Boost circuit drops, the output voltage drops, and whether the output voltage is less than or equal to a given minimum voltage target value U is judgedref_low；
If the output voltage is less than or equal to the given minimum voltage target value Uref_lowThen, open loop feedforward voltage stabilization control is introduced to calculate the duty ratio D of the switching tube1Replacement voltage loop PI regulation output value D_volObtaining an open-loop feedforward output value;
if the input voltage of the Boost circuit rises, the output voltage rises, and whether the output voltage is more than or equal to a given maximum voltage target value Uref_high，Uref_high>Uref_low；
If the output voltage is greater than or equal to the given maximum voltage target value Uref_highThen, open loop feedforward voltage stabilization control is introduced to calculate the duty ratio D of the switching tube1' replacement voltage loop PI adjusts output value D_volObtaining an open-loop feedforward output value;
and if the output voltage is recovered to a steady-state value, the open-loop feedforward voltage stabilization control is quitted, and the closed-loop control is recovered.
Preferably, according to the formula:
Figure BDA0002425074130000031
calculating the duty ratio D of the switching tube; in the formula of UinRepresenting the input voltage, U, of the Boost circuitoRepresenting the Boost circuit output voltage.
Preferably, if the output voltage is less than or equal to a given minimum voltage target value Uref_lowAnd when the voltage loop PI is given for the first time, the regulated output value of the voltage loop PI is given as m × D1Where m is a given coefficient of open loop and has m<1; subsequently, the regulated output value of the voltage loop PI is given by m × D1Gradually increasing to the duty ratio D of the switching tube1。
Preferably, if the output voltage is greater than or equal to a given maximum voltage target value Uref_highAnd when the voltage loop PI is given for the first time, the regulated output value of the voltage loop PI is given as m × D1', where m is a given coefficient for open loop and has m>1, subsequently giving the regulated output value of the voltage loop PI to be m × D1' gradual fall back to switching tube duty cycle D1’。
Preferably, if the output voltage is greater than a given minimum voltage target value Uref_lowAnd the output voltage is less than the given maximum voltage target value Uref_highAnd the Boost circuit works in a steady state working condition, and open-loop feedforward voltage stabilization control is not introduced.
Preferably, if the three-level Boost circuit adopts a voltage loop, an equalizing loop and an open-loop feedforward voltage stabilization control mode, the method further includes:
collecting voltage value U of output capacitor C11Voltage value U of output capacitor C22；
Will output the voltage value U of the capacitor C11Voltage value U of output capacitor C22Make and send into the voltage loop regulator and make the feedback value Uo_feedbackAnd the voltage feedback value U is addedo_feedbackWith a given voltage target value Uo_refSubstituting the voltage loop regulator into the voltage loop regulator, and performing PI regulation to obtain a voltage loop PI regulation output value;
will output the voltage value U of the capacitor C11Voltage value U of output capacitor C22Differential pressure is sent to a grading ring regulator to be a grading feedback value Ub_feedbackAnd the voltage-sharing feedback value U is usedb_feedbackWith a given voltage target value Ub_refSubstituting the voltage-equalizing ring regulator into the voltage-equalizing ring regulator, and obtaining a voltage-equalizing ring PI regulation output value after PI modulation;
if the output voltage is less than or equal to the given minimum voltage target value Uref_lowOr the output voltage is greater than or equal to a given maximum voltage target value Uref_highWhen open-loop feedforward voltage stabilization control is introduced, the open-loop feedforward output value and the equalizing ring PI regulation output value are superposed and sent to a PWM (pulse width modulation) generator to generate a driving signal to control the switch tube of a Boost circuitAnd (7) breaking.
Preferably, if the three-level Boost circuit adopts a voltage loop, a current loop, an equalizing loop and an open-loop feedforward voltage stabilization control mode, the method further includes:
collecting voltage value U of output capacitor C11Voltage value U of output capacitor C22And the current value I of the boost inductor Lin；
Will output the voltage value U of the capacitor C11Voltage value U of output capacitor C22Make and send into the voltage loop regulator and make the feedback value Uo_feedbackAnd the voltage feedback value U is addedo_feedbackWith a given voltage target value Uo_refSubstituting the voltage loop regulator into the voltage loop regulator, and performing PI regulation to obtain a voltage loop PI regulation output value;
if the output voltage is less than or equal to the given minimum voltage target value Uref_lowOr the output voltage is greater than or equal to a given maximum voltage target value Uref_highWhen open-loop feedforward voltage stabilization control is introduced, an open-loop feedforward output value is obtained to replace a voltage loop PI regulation output value;
taking the open-loop feedforward output value as the current target value I of the current loop regulatorin_refThe current value I is adjustedinCurrent feedback value I as current loop regulatorin_feedbackAnd feeding back the current to the value Iin_feedbackWith a current target value Iin_refSubstituting the current loop regulator for PI regulation, and using the PI regulation output value of the current loop as the reference value of the PWM generator;
will output the voltage value U of the capacitor C11Voltage value U of output capacitor C22Differential pressure is sent to a grading ring regulator to be a grading feedback value Ub_feedbackAnd the voltage-sharing feedback value U is usedb_feedbackWith a given voltage target value Ub_refAnd substituting the output value of the equalizing ring PI regulation and the output value of the current ring PI regulation into an equalizing ring regulator, after PI modulation, superposing the output value of the equalizing ring PI regulation and the output value of the current ring PI regulation and sending the superposed output values into a PWM pulse width modulation generator to generate a driving signal to control the on-off of a three-level Boost circuit switching tube.
The invention also provides a voltage stabilization control system aiming at the input voltage fluctuation of the three-level Boost circuit, and the voltage stabilization control method aiming at the input voltage fluctuation of the three-level Boost circuit is adopted and comprises the three-level Boost circuit; the system further comprises:
open-loop feed-forward voltage regulator: for judging whether the output voltage is less than or equal to a given minimum voltage target value Uref_lowThen, the duty ratio D of the switching tube is calculated1Replacement voltage loop PI regulation output value D_volObtaining an open-loop feedforward output value; or judging that the output voltage is greater than or equal to a given maximum voltage target value Uref_highThen, the duty ratio D of the switching tube is calculated1' replacement voltage loop PI adjusts output value D_volAnd obtaining an open-loop feedforward output value.
Preferably, the system further comprises:
voltage loop regulator: for feeding back voltage value Uo_feedbackWith a given voltage target value Uo_refSubstituting the voltage loop regulator for PI regulation to obtain a PI regulation output value D of the voltage loop_vol；
Grading ring adjuster: for equalizing feedback value Ub_feedbackWith a given voltage target value Ub_refSubstituting the voltage-equalizing ring regulator into the voltage-equalizing ring regulator, and performing PI modulation to obtain an output value D of the voltage-equalizing ring PI regulator_banl。
Preferably, the system further comprises: if the three-level Boost circuit adopts the mode of voltage ring, current ring, equalizer ring and open-loop feedforward voltage stabilization control, the system still includes:
current loop regulator: for using the open-loop feedforward output value as the current target value I of the current loop regulatorin_refFeeding back the current to the value Iin_feedbackWith a current target value Iin_refSubstituting the current loop regulator for PI regulation to obtain a current loop PI regulation output value.
Preferably, if the three-level Boost circuit adopts a voltage loop, an equalizing loop and an open-loop feedforward voltage stabilization control mode, the system further comprises:
a first adder: the voltage regulating circuit is used for summing the open-loop feedforward voltage-stabilizing regulating output value and the equalizing ring PI regulating output value into a pulse width modulation generator PWM2 to obtain a modulation signal of a pulse width modulation generator PWM 2;
the first subtracter: and the voltage regulating circuit is used for feeding the difference between the open-loop feedforward voltage-stabilizing regulating output value and the equalizing ring PI regulating output value into the pulse width modulation generator PWM1 to obtain a modulation signal of the pulse width modulation generator PWM 1.
Preferably, if the three-level Boost circuit adopts a voltage loop, a current loop, an equalizing loop and an open-loop feedforward voltage stabilization control mode, the system further comprises:
a second adder: the current loop PI regulation output value and the equalizing loop PI regulation output value are added and sent to a pulse width modulation generator PWM2, and a modulation signal of a pulse width modulation generator PWM2 is obtained;
a second subtractor: and the voltage-difference circuit is used for sending the difference between the current loop PI regulation output value and the equalizing loop PI regulation output value to the pulse width modulation generator PWM1 to obtain a modulation signal of the pulse width modulation generator PWM 1.
Preferably, the system further comprises:
the third adder: voltage value U for outputting capacitor C11Voltage value U of output capacitor C22Make and send into the voltage loop regulator and make the feedback value Uo_feedback；
A third subtracter: voltage value U for outputting capacitor C11Voltage value U of output capacitor C22Differential pressure is sent to a grading ring regulator to be a grading feedback value Ub_feedback。
Preferably, the system further comprises:
pulse width modulation generator PWM 1: the PWM control circuit is used for receiving a modulation signal of a pulse width modulation generator PWM1 and generating a driving signal of a three-level Boost circuit switching tube Q1;
pulse width modulation generator PWM 2: the PWM circuit is used for receiving a modulation signal of the PWM2 and generating a driving signal of a three-level Boost circuit switching tube Q2.
Compared with the prior art, the invention has the advantages and positive effects that:
the invention provides a voltage stabilization control method aiming at the input voltage fluctuation of a three-level Boost circuit, which is improved on the basis of the existing control method of the three-level Boost circuitThe feedforward voltage stabilization control uses the output voltage as a judgment condition for whether to intervene in closed-loop control, and when the output voltage is less than or equal to a given minimum voltage target value Uref_lowOr the output voltage is greater than or equal to a given maximum voltage target value Uref_highAnd during the process, open-loop feedforward voltage stabilization control is introduced, the working duty ratio of a switching tube is adjusted in an open loop mode in a dynamic process according to the change value of the output voltage, the sudden increase and the sudden decrease of the input voltage are effectively aimed at, and the dynamic response of a system is accelerated. Meanwhile, the method is only intervened in a dynamic process, so that the steady-state output characteristic of the circuit is not influenced, and the influence of large-range rapid change of the input voltage on the output voltage can be effectively eliminated. Meanwhile, the invention also provides a corresponding control system for carrying out voltage stabilization control on the input voltage fluctuation of the three-level Boost circuit.
Drawings
Fig. 1 is a schematic diagram of a conventional three-level Boost circuit control method using three-loop control;
FIG. 2 is a schematic diagram of a working mode of a three-level Boost circuit;
FIG. 3 is a flow chart of a voltage stabilization control method for three-level Boost circuit input voltage fluctuation according to the present invention;
FIG. 4 is a schematic block diagram of a regulated voltage control method of the present invention for three-level Boost circuit input voltage fluctuations;
fig. 5 is a schematic diagram of an open-loop feedforward voltage stabilization control method according to an embodiment of the invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings.
The existing control method of the three-level Boost circuit adopting three-ring control of a voltage outer ring, a current inner ring and an equalizing ring or double-ring control of the voltage ring and the equalizing ring only aims at the situation that the dynamic response condition of the system is not considered when the input voltage does not change rapidly in a large range and when the input voltage changes rapidly in a large range. However, when the input voltage changes rapidly, i.e. the duty ratio of the switching tube needs to change rapidly, the above method cannot ensure the dynamic response of the system. In view of the above, the invention provides a voltage stabilization control method for the input voltage fluctuation of a three-level Boost circuit, which can ensure the dynamic response of a system when the input voltage changes rapidly.
The working process of the switching tube in one period of the three-level Boost circuit is shown in fig. 2, and the working state of the three-level Boost in one period can be divided into 4 transient states:
① switch Q1 on and Q2 off as shown in FIG. 2(a), at which time the output capacitor C1 discharges to the load and the output capacitor C2 stores energy and the boost inductor L stores energy, ② switch Q1 off and Q2 off as shown in FIG. 2(b), at which time the power supply and boost inductor L discharge to the output capacitors C1 and C2 and the load simultaneously, ③ switch Q1 off and Q2 on as shown in FIG. 2(C), at which time the output capacitor C1 stores energy and the output capacitor C2 discharges to the load and the boost inductor L stores energy, ④ switch Q1 off and Q2 off as shown in FIG. 2(d), at which time the power supply and boost inductor L discharge to the output capacitors C1 and C2 and the load simultaneously.
The relationship between the input voltage and the output voltage of the three-level Boost circuit can be calculated by the inductance current balance under different working modes as follows:
Figure BDA0002425074130000091
from the above formula, when the system inputs the voltage UinWhen the output voltage is changed in a large range, the duty ratio D of the switching tube is inevitably changed in a large range under the steady-state working condition, and the response speed of the PI controller is limited, so that the output voltage U can be outputoWhen the change exceeds a certain limit value, open-loop feedforward voltage stabilization control is introduced, an open-loop feedforward voltage stabilization strategy takes output voltage as a judgment condition for judging whether to intervene closed-loop control, and the calculated steady-state duty ratio is input into a control link in advance to accelerate the dynamic response of the system.
Therefore, the embodiment of the present invention provides a voltage stabilization control method for fluctuation of an input voltage of a three-level Boost circuit, which is shown in fig. 3, 4, and 5, and specifically analyzed as follows:
(1) if the input voltage of the Boost circuit drops, the output voltage drops, and whether the output voltage drops or not is judgedLess than or equal to a given minimum voltage target value Uref_low。
(2) If the output voltage is less than or equal to the given minimum voltage target value Uref_lowThen, introducing open-loop feedforward voltage stabilization control according to the formula:
Figure BDA0002425074130000101
calculating the duty ratio D of the switching tube1Replacement voltage loop PI regulation output value D_volAnd obtaining an open-loop feedforward output value. In order to prevent the system from being impacted due to the large-range change of the duty ratio of the switching tube, the voltage loop PI regulating output value is given as m x D at the time of primary giving1Where m is a given coefficient of open loop and has m<1; subsequently, the regulated output value of the voltage loop PI is given by m × D1Gradually increasing to the duty ratio D of the switching tube1。
(3) If the input voltage of the Boost circuit rises, the output voltage rises, and whether the output voltage is more than or equal to a given maximum voltage target value Uref_high，Uref_high>Uref_low。
(4) If the output voltage is greater than or equal to the given maximum voltage target value Uref_highThen, open loop feedforward voltage stabilization control is introduced to calculate the duty ratio D of the switching tube1' replacement voltage loop PI adjusts output value D_volAnd obtaining an open-loop feedforward output value. In order to prevent the system from being impacted due to the large-range change of the duty ratio of the switching tube, the voltage loop PI regulating output value is given as m x D at the time of primary giving1', where m is a given coefficient for open loop and has m>1, subsequently giving the regulated output value of the voltage loop PI to be m × D1' gradual fall back to switching tube duty cycle D1’。
(5) If the output voltage is greater than the given minimum voltage target value Uref_lowAnd the output voltage is less than the given maximum voltage target value Uref_highAnd the Boost circuit works in a steady state working condition, and open-loop feedforward voltage stabilization control is not introduced.
(6) And if the output voltage is recovered to a steady-state value, the open-loop feedforward voltage stabilization control is quitted, and the closed-loop control is recovered.
A specific application is taken as an example, and referring to fig. 5, a voltage stabilization control method for input voltage fluctuation of a three-level Boost circuit according to an embodiment of the present invention is described in detail as follows:
① when the input voltage drops, the open loop feedforward voltage stabilization control is as follows:
step 1: at the time 0-t1, the circuit works in a steady state working condition mode, and at the time, the switching tube of the Boost circuit is in a duty ratio D0Working;
step 2: at the time of t1-t2, the input voltage suddenly drops, and the output voltage drops because the duty ratio of a switching tube cannot be rapidly adjusted in a system PI control link;
and step 3: at time t2-t3, when the output voltage falls to a given minimum voltage target value U at time t2ref_lowThen, the open-loop feedforward voltage-stabilizing control intervenes in the control link, and the duty ratio D is calculated according to the formula (1)1The PI output of the voltage replacement link participates in control, and in order to prevent impact on a system caused by large-range change of the duty ratio of the switching tube, the voltage ring PI output is given as m × D at the time of initial giving1Where m is a given coefficient of open loop and has m<1, the subsequent voltage loop PI is given by m × D1Stepwise increase to D1；
And 4, step 4: and after the time t3, the output voltage is recovered to a steady-state value, the open-loop feedforward voltage stabilization control is quitted, and the closed-loop control strategy is recovered.
② when the input voltage is suddenly increased, the open-loop feedforward voltage stabilization control steps are as follows:
step 1: at the time t4-t5, the circuit works in a steady working condition mode, and at the time, the switching tube of the Boost circuit is in a duty ratio D0' working;
step 2: at the time of t5-t6, the input voltage suddenly rises, and the output voltage drops because the duty ratio of a switching tube cannot be quickly adjusted in a system PI control link;
and step 3: at time t6-t7, when the output voltage rises to the given maximum voltage target value U at time t6ref_highThen, open loop feedforward control intervenes in a control link, and the duty ratio D is calculated according to the formula (1)1The PI output of the alternative voltage link participates in the control, and the impact on the system caused by the large-range change of the duty ratio of the switching tube is preventedAt the initial setting, the voltage loop PI is output to be set to m x D1', where m is a given coefficient for open loop and has m>1, the subsequent voltage loop PI is given by m × D1' step by step falling back to D1’；
And 4, step 4: and after the time t7, the output voltage is recovered to a steady-state value, the open-loop feedforward voltage stabilization control is quitted, and the closed-loop control strategy is recovered.
It should be noted that in this embodiment, as shown in fig. 4(a), if the three-level Boost circuit adopts a voltage loop, an equalizing loop, and an open-loop feed-forward voltage regulation control manner, the method further includes:
collecting voltage value U of output capacitor C11Voltage value U of output capacitor C22；
Will output the voltage value U of the capacitor C11Voltage value U of output capacitor C22Make and send into the voltage loop regulator and make the feedback value Uo_feedbackAnd the voltage feedback value U is addedo_feedbackWith a given voltage target value Uo_refSubstituting the voltage loop regulator into the voltage loop regulator, and performing PI regulation to obtain a voltage loop PI regulation output value;
will output the voltage value U of the capacitor C11Voltage value U of output capacitor C22Differential pressure is sent to a grading ring regulator to be a grading feedback value Ub_feedbackAnd the voltage-sharing feedback value U is usedb_feedbackWith a given voltage target value Ub_refSubstituting the voltage-equalizing ring regulator into the voltage-equalizing ring regulator, and obtaining a voltage-equalizing ring PI regulation output value after PI modulation;
if the output voltage is less than or equal to the given minimum voltage target value Uref_lowOr the output voltage is greater than or equal to a given maximum voltage target value Uref_highWhen open-loop feedforward voltage stabilization control is introduced, the open-loop feedforward output value and the equalizing ring PI regulation output value are superposed and sent to the PWM generator to generate a driving signal to control the on-off of a switching tube of a Boost circuit.
As shown in fig. 4(b), if the three-level Boost circuit adopts a voltage loop, a current loop, a voltage-sharing loop, and an open-loop feedforward voltage-stabilizing control manner, the method further includes:
collecting voltage value U of output capacitor C11Output capacitanceVoltage value U of C22And the current value I of the boost inductor Lin；
Will output the voltage value U of the capacitor C11Voltage value U of output capacitor C22Make and send into the voltage loop regulator and make the feedback value Uo_feedbackAnd the voltage feedback value U is addedo_feedbackWith a given voltage target value Uo_refSubstituting the voltage loop regulator into the voltage loop regulator, and performing PI regulation to obtain a voltage loop PI regulation output value;
if the output voltage is less than or equal to the given minimum voltage target value Uref_lowOr the output voltage is greater than or equal to a given maximum voltage target value Uref_highWhen open-loop feedforward voltage stabilization control is introduced, an open-loop feedforward output value is obtained to replace a voltage loop PI regulation output value;
taking the open-loop feedforward output value as the current target value I of the current loop regulatorin_refThe current value I is adjustedinCurrent feedback value I as current loop regulatorin_feedbackAnd feeding back the current to the value Iin_feedbackWith a current target value Iin_refSubstituting the current loop regulator for PI regulation, and using the PI regulation output value of the current loop as the reference value of the PWM generator;
will output the voltage value U of the capacitor C11Voltage value U of output capacitor C22Differential pressure is sent to a grading ring regulator to be a grading feedback value Ub_feedbackAnd the voltage-sharing feedback value U is usedb_feedbackWith a given voltage target value Ub_refAnd substituting the output value of the equalizing ring PI regulation and the output value of the current ring PI regulation into an equalizing ring regulator, after PI modulation, superposing the output value of the equalizing ring PI regulation and the output value of the current ring PI regulation and sending the superposed output values into a PWM pulse width modulation generator to generate a driving signal to control the on-off of a three-level Boost circuit switching tube.
Therefore, compared with the existing control mode, the method introduces the system input voltage into the control link, introduces the open-loop feedforward voltage stabilization control in the dynamic process, and adjusts the working duty ratio of the switching tube in the dynamic process according to the output voltage change value in an open-loop manner, thereby effectively aiming at the sudden increase and sudden decrease of the input voltage and accelerating the dynamic response of the system. Meanwhile, the method is only intervened in a dynamic process, so that the steady-state output characteristic of the circuit is not influenced, and the influence of large-range rapid change of the input voltage on the output voltage can be effectively eliminated.
Meanwhile, the invention also provides a voltage stabilization control system aiming at the input voltage fluctuation of the three-level Boost circuit, and the voltage stabilization control method aiming at the input voltage fluctuation of the three-level Boost circuit is adopted and comprises a three-level Boost circuit; the system comprises:
voltage loop regulator: for feeding back voltage value Uo_feedbackWith a given voltage target value Uo_refSubstituting the voltage loop regulator for PI regulation to obtain a PI regulation output value D of the voltage loop_vol；
Grading ring adjuster: for equalizing feedback value Ub_feedbackWith a given voltage target value Ub_refSubstituting the voltage-equalizing ring regulator into the voltage-equalizing ring regulator, and performing PI modulation to obtain an output value D of the voltage-equalizing ring PI regulator_banl。
Open-loop feed-forward voltage regulator: for judging whether the output voltage is less than or equal to a given minimum voltage target value Uref_lowThen, the duty ratio D of the switching tube is calculated1Replacement voltage loop PI regulation output value D_volObtaining an open-loop feedforward output value; or judging that the output voltage is greater than or equal to a given maximum voltage target value Uref_highThen, the duty ratio D of the switching tube is calculated1' replacement voltage loop PI adjusts output value D_volAnd obtaining an open-loop feedforward output value.
(1) As shown in fig. 4(a), if the three-level Boost circuit adopts a voltage loop, a voltage-equalizing loop, and an open-loop feedforward voltage-stabilizing control manner, the system further includes:
the third adder: voltage value U for outputting capacitor C11Voltage value U of output capacitor C22Make and send into the voltage loop regulator and make the feedback value Uo_feedback；
A third subtracter: voltage value U for outputting capacitor C11Voltage value U of output capacitor C22Differential pressure is sent to a grading ring regulator to be a grading feedback value Ub_feedback。
A first adder: the voltage regulating circuit is used for summing the open-loop feedforward voltage-stabilizing regulating output value and the equalizing ring PI regulating output value into a pulse width modulation generator PWM2 to obtain a modulation signal of a pulse width modulation generator PWM 2;
the first subtracter: and the voltage regulating circuit is used for feeding the difference between the open-loop feedforward voltage-stabilizing regulating output value and the equalizing ring PI regulating output value into the pulse width modulation generator PWM1 to obtain a modulation signal of the pulse width modulation generator PWM 1.
Pulse width modulation generator PWM 1: the PWM control circuit is used for receiving a modulation signal of a pulse width modulation generator PWM1 and generating a driving signal of a three-level Boost circuit switching tube Q1;
pulse width modulation generator PWM 2: the PWM circuit is used for receiving a modulation signal of the PWM2 and generating a driving signal of a three-level Boost circuit switching tube Q2.
(2) As shown in fig. 4(b), if the three-level Boost circuit adopts a voltage loop, a current loop, a voltage-sharing loop, and an open-loop feedforward voltage-stabilizing control manner, the system further includes:
current loop regulator: for using the open-loop feedforward output value as the current target value I of the current loop regulatorin_refFeeding back the current to the value Iin_feedbackWith a current target value Iin_refSubstituting the current loop regulator for PI regulation to obtain a current loop PI regulation output value.
The third adder: voltage value U for outputting capacitor C11Voltage value U of output capacitor C22Make and send into the voltage loop regulator and make the feedback value Uo_feedback；
A third subtracter: voltage value U for outputting capacitor C11Voltage value U of output capacitor C22Differential pressure is sent to a grading ring regulator to be a grading feedback value Ub_feedback。
A second adder: the current loop PI regulation output value and the equalizing loop PI regulation output value are added and sent to a pulse width modulation generator PWM2, and a modulation signal of a pulse width modulation generator PWM2 is obtained;
a second subtractor: and the voltage-difference circuit is used for sending the difference between the current loop PI regulation output value and the equalizing loop PI regulation output value to the pulse width modulation generator PWM1 to obtain a modulation signal of the pulse width modulation generator PWM 1.
Pulse width modulation generator PWM 1: the PWM control circuit is used for receiving a modulation signal of a pulse width modulation generator PWM1 and generating a driving signal of a three-level Boost circuit switching tube Q1;
pulse width modulation generator PWM 2: the PWM circuit is used for receiving a modulation signal of the PWM2 and generating a driving signal of a three-level Boost circuit switching tube Q2.
In summary, the invention improves on the basis of the existing control method of the three-level Boost circuit, and provides a voltage stabilization control method and a voltage stabilization control system aiming at the input voltage fluctuation of the three-level Boost circuit. Meanwhile, the method is only intervened in a dynamic process, so that the steady-state output characteristic of the circuit is not influenced, and the influence of large-range rapid change of the input voltage on the output voltage can be effectively eliminated. Meanwhile, the invention also provides a corresponding control system for carrying out voltage stabilization control on the input voltage fluctuation of the three-level Boost circuit.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes, without departing from the technical spirit of the present invention, and any simple modification, equivalent change and change made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical spirit of the present invention.

Claims (14)

1. A voltage stabilization control method for input voltage fluctuation of a three-level Boost circuit is characterized by comprising the following steps:
if the input voltage of the Boost circuit drops, the output voltage drops, and whether the output voltage is less than or equal to a given minimum voltage target value U is judgedref_low；
If the output voltage is less than or equal to the given minimum voltage target value Uref_lowThen, open loop feedforward voltage stabilization control is introduced to calculate the duty ratio D of the switching tube1Replacement voltage loop PI regulation output value D_volObtaining an open-loop feedforward output value;
if the input voltage of the Boost circuit rises, the output voltage rises, and whether the output voltage is more than or equal to a given maximum voltage target value Uref_high，Uref_high>Uref_low；
If the output voltage is greater than or equal to the given maximum voltage target value Uref_highThen, open loop feedforward voltage stabilization control is introduced to calculate the duty ratio D of the switching tube1' replacement voltage loop PI adjusts output value D_volObtaining an open-loop feedforward output value;
and if the output voltage is recovered to a steady-state value, the open-loop feedforward voltage stabilization control is quitted, and the closed-loop control is recovered.
2. The voltage stabilization control method for the input voltage fluctuation of the three-level Boost circuit according to claim 1, characterized in that according to a formula:
Figure FDA0002425074120000011
calculating the duty ratio D of the switching tube; in the formula of UinRepresenting the input voltage, U, of the Boost circuitoRepresenting the Boost circuit output voltage.
3. The voltage stabilization control method for the input voltage fluctuation of the three-level Boost circuit according to claim 1, wherein the output voltage is equal to or less than a given minimum voltage target value Uref_lowAnd when the voltage loop PI is given for the first time, the regulated output value of the voltage loop PI is given as m × D1Where m is a given coefficient of open loop and has m<1; subsequently, the regulated output value of the voltage loop PI is given by m × D1Gradually increasing to the duty ratio D of the switching tube1。
4. The voltage stabilization control method for the input voltage fluctuation of the three-level Boost circuit according to claim 3, wherein the output voltage is equal to or greater than a given maximum voltage target value Uref_highAnd when the voltage loop PI is given for the first time, the regulated output value of the voltage loop PI is given as m × D1', where m is a given coefficient for open loop and has m>1, subsequently giving the regulated output value of the voltage loop PI to be m × D1' gradual fall back to switching tube duty cycle D1’。
5. The method as claimed in claim 1, wherein the step-up control method is performed if the output voltage is greater than a given minimum voltage target value Uref_lowAnd the output voltage is less than the given maximum voltage target value Uref_highAnd the Boost circuit works in a steady state working condition, and open-loop feedforward voltage stabilization control is not introduced.
6. The regulated voltage control method for input voltage fluctuation of a three-level Boost circuit according to any one of claims 1 to 5, wherein if the three-level Boost circuit adopts a voltage loop, a voltage equalizing loop and an open loop feed-forward regulated voltage control mode, the method further comprises:
collecting voltage value U of output capacitor C11Voltage value U of output capacitor C22；
Will output the voltage value U of the capacitor C11Voltage value U of output capacitor C22Make and send into the voltage loop regulator and make the feedback value Uo_feedbackAnd the voltage feedback value U is addedo_feedbackWith a given voltage target value Uo_refSubstituting the voltage loop regulator into the voltage loop regulator, and performing PI regulation to obtain a voltage loop PI regulation output value;
will output the voltage value U of the capacitor C11Voltage value U of output capacitor C22Differential pressure is sent to a grading ring regulator to be a grading feedback value Ub_feedbackAnd the voltage-sharing feedback value U is usedb_feedbackWith a given voltage target value Ub_refSubstituting the voltage-equalizing ring regulator into the voltage-equalizing ring regulator, and obtaining a voltage-equalizing ring PI regulation output value after PI modulation;
if the output voltage is less than or equal to the given minimum voltage target value Uref_lowOr the output voltage is greater than or equal to a given maximum voltage target value Uref_highWhen open-loop feedforward voltage stabilization control is introduced, the open-loop feedforward output value and the equalizing ring PI regulation output value are superposed and sent to the PWM generator to generate a driving signal to control the on-off of a switching tube of a Boost circuit.
7. The voltage stabilization control method for the input voltage fluctuation of the three-level Boost circuit according to any one of claims 1 to 5, wherein if the three-level Boost circuit adopts a voltage loop, a current loop, a voltage equalizing loop and an open loop feedforward voltage stabilization control mode, the method further comprises the following steps:
collecting voltage value U of output capacitor C11Voltage value U of output capacitor C22And the current value I of the boost inductor Lin；
Will output the voltage value U of the capacitor C11Voltage value U of output capacitor C22Make and send into the voltage loop regulator and make the feedback value Uo_feedbackAnd the voltage feedback value U is addedo_feedbackWith a given voltage target value Uo_refSubstituting the voltage loop regulator into the voltage loop regulator, and performing PI regulation to obtain a voltage loop PI regulation output value;
if the output voltage is less than or equal to the given minimum voltage target value Uref_lowOr the output voltage is greater than or equal to a given maximum voltage target value Uref_highWhen open-loop feedforward voltage stabilization control is introduced, an open-loop feedforward output value is obtained to replace a voltage loop PI regulation output value;
taking the open-loop feedforward output value as the current target value I of the current loop regulatorin_refThe current value I is adjustedinCurrent feedback value I as current loop regulatorin_feedbackAnd feeding back the current to the value Iin_feedbackWith a current target value Iin_refSubstituting the current loop regulator for PI regulation, and using the PI regulation output value of the current loop as the reference value of the PWM generator;
will output the voltage value U of the capacitor C11Voltage of output capacitor C2Value U2Differential pressure is sent to a grading ring regulator to be a grading feedback value Ub_feedbackAnd the voltage-sharing feedback value U is usedb_feedbackWith a given voltage target value Ub_refAnd substituting the output value of the equalizing ring PI regulation and the output value of the current ring PI regulation into an equalizing ring regulator, after PI modulation, superposing the output value of the equalizing ring PI regulation and the output value of the current ring PI regulation and sending the superposed output values into a PWM pulse width modulation generator to generate a driving signal to control the on-off of a three-level Boost circuit switching tube.
8. A voltage stabilization control system aiming at the input voltage fluctuation of a three-level Boost circuit adopts the voltage stabilization control method aiming at the input voltage fluctuation of the three-level Boost circuit, which comprises the three-level Boost circuit, wherein the voltage stabilization control method comprises the following steps of; characterized in that, the system still includes:
open-loop feed-forward voltage regulator: for judging whether the output voltage is less than or equal to a given minimum voltage target value Uref_lowThen, the duty ratio D of the switching tube is calculated1Replacement voltage loop PI regulation output value D_volObtaining an open-loop feedforward output value; or judging that the output voltage is greater than or equal to a given maximum voltage target value Uref_highThen, the duty ratio D of the switching tube is calculated1' replacement voltage loop PI adjusts output value D_volAnd obtaining an open-loop feedforward output value.
9. The regulated control system for three-level Boost circuit input voltage ripple of claim 8, wherein the system further comprises:
voltage loop regulator: for feeding back voltage value Uo_feedbackWith a given voltage target value Uo_refSubstituting the voltage loop regulator for PI regulation to obtain a PI regulation output value D of the voltage loop_vol；
Grading ring adjuster: for equalizing feedback value Ub_feedbackWith a given voltage target value Ub_refSubstituting the voltage-equalizing ring regulator into the voltage-equalizing ring regulator, and performing PI modulation to obtain an output value D of the voltage-equalizing ring PI regulator_banl。
10. The regulated control system for three-level Boost circuit input voltage ripple of claim 9, wherein the system further comprises: if the three-level Boost circuit adopts the mode of voltage ring, current ring, equalizer ring and open-loop feedforward voltage stabilization control, the system still includes:
current loop regulator: for using the open-loop feedforward output value as the current target value I of the current loop regulatorin_refFeeding back the current to the value Iin_feedbackWith a current target value Iin_refSubstituting the current loop regulator for PI regulation to obtain a current loop PI regulation output value.
11. The regulated control system for input voltage ripple of a three-level Boost circuit of claim 9, wherein if the three-level Boost circuit employs voltage loop, voltage equalizer loop, and open-loop feed-forward regulated control, the system further comprises:
a first adder: the voltage regulating circuit is used for summing the open-loop feedforward voltage-stabilizing regulating output value and the equalizing ring PI regulating output value into a pulse width modulation generator PWM2 to obtain a modulation signal of a pulse width modulation generator PWM 2;
the first subtracter: and the voltage regulating circuit is used for feeding the difference between the open-loop feedforward voltage-stabilizing regulating output value and the equalizing ring PI regulating output value into the pulse width modulation generator PWM1 to obtain a modulation signal of the pulse width modulation generator PWM 1.
12. The regulated control system for input voltage ripple of a three-level Boost circuit of claim 10, wherein if the three-level Boost circuit employs voltage loop, current loop, voltage equalizer loop, and open-loop feed-forward regulated control, the system further comprises:
a second adder: the current loop PI regulation output value and the equalizing loop PI regulation output value are added and sent to a pulse width modulation generator PWM2, and a modulation signal of a pulse width modulation generator PWM2 is obtained;
a second subtractor: and the voltage-difference circuit is used for sending the difference between the current loop PI regulation output value and the equalizing loop PI regulation output value to the pulse width modulation generator PWM1 to obtain a modulation signal of the pulse width modulation generator PWM 1.
13. The regulated control system for three-level Boost circuit input voltage fluctuations of claim 11 or 12, further comprising:
the third adder: voltage value U for outputting capacitor C11Voltage value U of output capacitor C22Make and send into the voltage loop regulator and make the feedback value Uo_feedback；
A third subtracter: voltage value U for outputting capacitor C11Voltage value U of output capacitor C22Differential pressure is sent to a grading ring regulator to be a grading feedback value Ub_feedback。
14. The regulated control system for three-level Boost circuit input voltage fluctuations of claim 11 or 12, further comprising:
pulse width modulation generator PWM 1: the PWM control circuit is used for receiving a modulation signal of a pulse width modulation generator PWM1 and generating a driving signal of a three-level Boost circuit switching tube Q1;
pulse width modulation generator PWM 2: the PWM circuit is used for receiving a modulation signal of the PWM2 and generating a driving signal of a three-level Boost circuit switching tube Q2.
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