CN110365229B - Time-varying control method for phase-splitting area of three-phase step-down rectifier - Google Patents
Time-varying control method for phase-splitting area of three-phase step-down rectifier Download PDFInfo
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- CN110365229B CN110365229B CN201910631584.5A CN201910631584A CN110365229B CN 110365229 B CN110365229 B CN 110365229B CN 201910631584 A CN201910631584 A CN 201910631584A CN 110365229 B CN110365229 B CN 110365229B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/2173—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a biphase or polyphase circuit arrangement
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Abstract
Relates to a time-varying control method for a phase separation region of a three-phase buck rectifier, which comprises the following steps: step one, dividing a working period of a power supply into u phase regions, initializing a sine table, and setting a sine table array sin [ i ], wherein i is 1,2,3, …, n is the switching frequency of the phase regions, and n points are arranged in the phase regions by switches; step two, sampling three-phase voltage, judging a phase region where the current moment is located, and confirming the phase region number x of the moment, wherein x is 1,2,3, …, u; step three, comparing the phase area number of the current moment with the phase area number of the previous moment to judge whether the phase area jumps or not; if yes, executing the step four; if not, executing the fifth step; step four, acquiring the value i of the current moment; performing PLL phase locking; obtaining the switching period value of the previous phase region, and updating the switching period value; setting i to zero, and executing the third step; step five, looking up the table to find out corresponding sine table array calculation sin [ i ] and sin [ n-i ]; calculating according to a formula to obtain switching vector time; and adding 1 to the value of i, and judging whether the phase region jumps again.
Description
Technical Field
The application belongs to the technical design field of power electronic converters, and particularly relates to a time-varying control method for a phase-splitting area of a three-phase step-down rectifier.
Background
A three-phase step-down rectifier is a three-phase AC-DC converter with power factor correction function, its control strategy mainly adopts current type space vector modulation algorithm, judges the phase region according to the input voltage current waveform, then controls the corresponding switch tube high frequency work in each phase region to realize AC-DC rectification function, generally divides the input voltage into a plurality of phase regions in one period, gates the corresponding switch tube to carry out PWM work by calculating the phase angle and the switch vector time, when the input voltage is balanced, the time length of each phase region is equal, the power supply working period value can be calculated by the sampling circuit and the phase-locked loop circuit (algorithm), then the switch vector time and the switch tube working duty ratio are calculated by the period value, but if the input voltage has non-ideal conditions, such as distortion, imbalance, etc, When phase shift or a small amount of direct current components exist, the time duration of each phase region has larger deviation and is different, as shown in fig. 1, the time duration of the phase regions does not have obvious regularity when changing from one phase region to another phase region, and therefore the problems of input current distortion, unstable output voltage and the like are caused.
The present application is made in view of the above-mentioned drawbacks of the prior art.
Disclosure of Invention
The present application is directed to a method for controlling a split-phase time-varying mode of a three-phase buck-type rectifier, so as to overcome or alleviate at least one of the disadvantages of the prior art.
The technical scheme of the application is as follows:
a three-phase step-down rectifier phase-splitting area time-varying control method comprises the following steps:
step one, dividing a working cycle of a three-phase input power supply into u phase areas, initializing a sine table, setting a sine table array sin [ i ], wherein i is 1,2,3, …, n is the switching frequency of one phase area, n switching points are arranged in each phase area, and executing step two;
step two, three-phase input power supply voltage sampling, judging a phase area where a switching period is located at the current moment, confirming that the number x of the current phase area is 1,2,3, …, u, and executing step three;
comparing the phase area number of the switching period at the current moment with the phase area number of the switching period at the previous moment to judge whether the phase area of the switching period at the current moment jumps or not; if yes, executing the step four; if not, executing the step five.
Step four, acquiring the value i of the current moment; performing PLL phase locking; obtaining the switching period value of the previous phase region to update the switching period value of the current moment; setting i to zero, and executing the third step;
step five, looking up the table to find corresponding sine table arrays sin [ i ] and sin [ n-i ]; calculating according to a formula to obtain switching vector time; adding 1 to the value of i, and judging whether the phase region in which the switching period is positioned at the current moment jumps again; if yes, executing the step four; if not, the fifth step is executed again.
According to at least one embodiment of the present application, u-6.
In accordance with at least one embodiment of the present application,
wherein the content of the first and second substances,
fosetting the working frequency of the three-phase input power supply;
fsthe switching frequency of the switching tube is given to the main power circuit.
According to at least one embodiment of the present application, the switching vector time is calculated according to a formula in step five, specifically:
t1＝m·sin[n-i]·Tx；
t2＝m·sin[i]·Tx(ii) a Wherein the content of the first and second substances,
t1、t2is the switching vector time, duty cycle duration;
m is a modulation ratio;
Txthe switching period value of the x-th phase region is x ═ 1,2,3, …, u.
According to at least one embodiment of the present application, m < 0.866.
According to at least one embodiment of the present application, the PLL phase locking in step four is specifically:
if i < n/6, the period of the phase section switch is reduced, and if i > n/6, the period of the phase section switch is increased until i equals n/6, and the switching period of the phase section is kept unchanged.
According to at least one embodiment of the present application, if x is 1, the last phase zone switching period value is Tx+5If x>When 1, the last phase area switch period value is Tx-1。
Drawings
FIG. 1 is a schematic diagram of input asymmetric time-space vector phase region division provided in an embodiment of the present application;
fig. 2 is a schematic diagram of a topology of a three-phase buck rectifier provided in an embodiment of the present application;
fig. 3 is a flowchart of a time-varying control method for a phase separation region of a three-phase buck-type rectifier according to an embodiment of the present application.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant application and are not limiting of the application. It should be noted that, for convenience of description, only the portions related to the present application are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
It should be noted that in the description of the present application, the terms of direction or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present application, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those skilled in the art as the case may be.
The present application is described in further detail below with reference to fig. 1 to 3.
A three-phase step-down rectifier phase-splitting area time-varying control method comprises the following steps:
step one, dividing a working cycle of a three-phase input power supply into u phase areas, initializing variables such as a sine table, setting a sine table array sin [ i ], wherein i is 1,2,3, …, n is the switching frequency of one phase area, n switching points are arranged in each phase area, and executing step two;
step two, sampling three-phase voltage, judging a phase area where a switching period at the current moment is located, determining the number x of the phase area where the switching period at the current moment is located, wherein x is 1,2,3, … and u, and executing step three;
comparing the phase area number of the switching period at the current moment with the phase area number of the switching period at the previous moment to judge whether the phase area of the switching period at the current moment jumps or not; if yes, executing the step four; if not, executing the fifth step;
step four, obtaining the value i of the current moment; performing PLL phase locking; obtaining the switching period value of the previous phase region to update the switching period value of the current moment; finally, setting i to zero, and executing the third step;
and step five, looking up the table to find corresponding sine table arrays sin [ i ] and sin [ n-i ], calculating according to a formula to obtain switching vector time, adding 1 to the value of i, and executing the step three.
And judging whether the phase region jumps or not again.
According to at least one embodiment of the present application, u-6.
In accordance with at least one embodiment of the present application,
wherein the content of the first and second substances,
fosetting the working frequency of the three-phase input power supply;
fsswitching tube switching frequency is given to the main power circuit.
According to at least one embodiment of the present application, the switching vector time is calculated according to a formula in step five, specifically:
t1＝m·sin[n-i]·Tx；
t2＝m·sin[i]·Tx(ii) a Wherein the content of the first and second substances,
t1、t2is the switching vector time, duty cycle duration;
m is a modulation ratio;
Txthe switching period value of the x-th phase region is x ═ 1,2,3, …, u.
According to at least one embodiment of the present application, m < 0.866.
According to at least one embodiment of the present application, the PLL phase locking in step four is specifically:
if i < n/6, the period of the phase section switch is reduced, and if i > n/6, the period of the phase section switch is increased until i equals n/6, and the switching period of the phase section is kept unchanged.
According to at least one embodiment of the present application, if x is 1, the last phase zone switching period value is Tx+5If x>When 1, the last phase area switch period value is Tx-1。
For the phase-splitting region time-varying control method of the three-phase buck-type rectifier disclosed in the above embodiment, the following should be understood by those skilled in the art:
the sin value is calculated by a fixed step length and a table look-up method, the shortest length of the sin table is one sixth of the switching frequency of a power supply working period, so that the corresponding program is simpler, the sine value does not need to be calculated in real time, the operating efficiency of the whole system can be effectively improved, and the switching frequency of the power supply working is further improved;
the switching period value of each phase region is finely adjusted, so that the same number of switching times can be completely calculated in each phase region, on one hand, the current waveform is prevented from generating phase shift, on the other hand, the current waveform is closer to sine, and meanwhile, zero crossing point distortion is avoided.
The method adopts six independent switching period values T1, T2, T3, T4, T5 and T6 for each phase region, the six switching period values are independent from one another and have no necessary connection, each phase region is independently sampled and phase-locked to obtain the switching period value of the phase region, and the switching period value is independently used in the phase region of the next working period, so that the influence caused by unbalanced input voltage can be effectively inhibited;
when the input voltage is in an imperfect state, such as distortion, phase shift, imbalance and a small amount of direct current components, the time length of each phase region changes, and the switching vector time t1 and t2 can perfectly track the phase region time diagram 1 by performing time length sampling calculation, adjustment and phase locking through the phase regions, so that the input current waveform of the rectifier is greatly improved.
So far, the technical solutions of the present application have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present application is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the present application, and the technical scheme after the changes or substitutions will fall into the protection scope of the present application.
Claims (3)
1. A three-phase step-down rectifier phase-splitting area time-varying control method is characterized by comprising the following steps:
step one, dividing a working cycle of a three-phase input power supply into u phase areas, initializing a sine table, setting a sine table array sin [ i ], wherein i is 1,2,3, …, n is the switching frequency of one phase area, and n switching points are arranged in each phase area, and executing step two;
step two, three-phase input power supply voltage sampling, judging a phase area where a switching period at the current moment is located, confirming the number x of the phase area where the switching period at the current moment is located, wherein x is 1,2,3, … and u, and executing step three;
comparing the phase area number of the switching period at the current moment with the phase area number of the switching period at the previous moment to judge whether the phase area of the switching period at the current moment jumps or not; if yes, executing the step four; if not, executing the fifth step;
step four, acquiring the value i of the current moment; performing PLL phase locking; obtaining the switching period value of the previous phase region to update the switching period value of the current moment; setting i to zero, and executing the third step;
step five, looking up the table to find corresponding sine table arrays sin [ i ] and sin [ n-i ]; calculating according to a formula to obtain switching vector time; adding 1 to the value of i, and judging whether the phase region in which the switching period is positioned at the current moment jumps again; if yes, executing the step four; if not, re-executing the fifth step;
u＝6；
fosetting the working frequency of the three-phase input power supply;
fssetting the switching frequency of a switching tube of the main power circuit;
in the fifth step, the switching vector time is calculated according to a formula, and the method specifically comprises the following steps:
t1＝m·sin[n-i]·Tx；
t2＝m·sin[i]·Tx(ii) a Wherein the content of the first and second substances,
t1、t2is the switching vector time;
m is a modulation ratio;
Txis the switching period value of the x-th phase region, x is 1,2,3, …, u;
the PLL phase lock in step four specifically includes:
and if i is less than n/6, reducing the switching period value of the previous phase region, and if i is greater than n/6, increasing the switching period value of the previous phase region until i is equal to n/6, and keeping the switching period of the phase region in which the switching period is located at the current moment unchanged.
2. The phase-splitting region time-varying control method of a three-phase buck-type rectifier as claimed in claim 1,
m≤0.866。
3. the phase-splitting region time-varying control method of a three-phase buck-type rectifier as claimed in claim 2,
if x is equal to 1, the last phase zone switching period value is Tx+5；
If x>When 1, the last phase area switch period value is Tx-1。
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