CN114079392B - AC-DC converter based on constant power load and control method thereof - Google Patents
AC-DC converter based on constant power load and control method thereof Download PDFInfo
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- CN114079392B CN114079392B CN202111393568.0A CN202111393568A CN114079392B CN 114079392 B CN114079392 B CN 114079392B CN 202111393568 A CN202111393568 A CN 202111393568A CN 114079392 B CN114079392 B CN 114079392B
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Classifications
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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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- 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
- H02M7/219—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 bridge configuration
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- Engineering & Computer Science (AREA)
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Abstract
The disclosure provides an AC-DC converter based on constant power load and a control method thereof, wherein the method comprises the following steps: output current i based on switch unit in AC-DC converter odc And a DC side voltage v dc Obtaining a power observation value P of a constant power load CPL * The method comprises the steps of carrying out a first treatment on the surface of the Based on power observations P CPL * Calculating a predicted value i of output active current of an AC-DC converter od1 * The method comprises the steps of carrying out a first treatment on the surface of the Based on the output DC voltage v dc And reference voltage v dc * Nonlinear proportional integral adjustment is carried out to obtain a reference current correction value delta i od * The method comprises the steps of carrying out a first treatment on the surface of the Based on the reference current correction value Deltai od * And predictive value i od1 * Obtaining a reference active component i of the alternating output current od * The method comprises the steps of carrying out a first treatment on the surface of the Reference active component i based on ac output current od * Active component i of alternating side current od Reactive component i of ac side current oq And a reference reactive component i of the ac output current oq * Obtaining the active component v of the output line voltage of the AC-DC converter od And reactive component v oq The method comprises the steps of carrying out a first treatment on the surface of the Based on the active component v od And reactive component v oq The switching unit of the ac-dc converter is controlled.
Description
Technical Field
The disclosure relates to the technical field of electric power, in particular to an alternating-current/direct-current converter based on a constant-power load and a control method thereof.
Background
With the development of distributed new energy, the direct current micro-grid is increasingly applied. The AC-DC converter is connected with the AC distribution network, so that the power supply reliability of the DC micro-grid can be improved to a great extent. When the load converter is connected with a constant resistor, the output power of the load converter is constant, and the load converter presents constant power characteristics. However, in practical application, a constant-power load may present a negative impedance characteristic, which reduces stability and reliability of the whole power grid system.
Disclosure of Invention
In view of the above, an object of the present disclosure is to provide an ac-dc converter based on a constant power load and a control method thereof.
Based on the above object, the present disclosure provides a control method of an ac-dc converter based on a constant power load, including: based on the output current i of the switch unit in the AC-DC converter odc And a DC side voltage v dc Obtaining a power observation value P of a constant power load CPL *；
Based on the power observations P CPL * Calculating a predicted value i of the output active current of the AC-DC converter od1 *；
Based on the output DC voltage v dc And reference voltage v dc * Nonlinear proportional integral regulation is carried out to obtain regulated output delta i od * The method comprises the steps of carrying out a first treatment on the surface of the From i od1 * And Deltai od * Adding to obtain a reference active component i of the alternating output current od *。
A reference active component i based on the alternating output current od * Active component i of alternating side current od Reactive component i of ac side current oq And a reference reactive component i of the ac output current oq * Obtaining an active component v of the output line voltage of the AC-DC converter od And reactive component v oq ；
Based on the active component v od And reactive component v oq And controlling a switching unit of the AC-DC converter.
In another aspect, the present disclosure provides an ac-dc converter controlled using a method according to the first aspect.
From the above, the control method for the alternating-current/direct-current converter with constant power load provided by the present disclosure adopts nonlinear proportional integral and passive control to control the alternating-current/direct-current converter by observing the constant power load, thereby realizing rapid load change tracking, having good dynamic performance, rapidly eliminating static errors, and improving the stability and reliability of the power grid system.
Drawings
In order to more clearly illustrate the technical solutions of the present disclosure or related art, the drawings required for the embodiments or related art description will be briefly described below, and it is apparent that the drawings in the following description are only embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort to those of ordinary skill in the art.
Fig. 1 is a schematic main circuit diagram of an ac-dc converter according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of an AC-DC converter control method for a constant power load according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of alternating voltage and current waveforms of an AC-to-DC converter according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of reference values and output values of active current of an AC-DC converter according to an embodiment of the disclosure;
fig. 5 is a schematic diagram of dc voltage reference values and output values of an ac-dc converter according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram of constant power load values and observations of an ac-dc converter according to an embodiment of the disclosure.
Detailed Description
For the purposes of promoting an understanding of the principles and advantages of the disclosure, reference will now be made to the embodiments illustrated in the drawings and specific language will be used to describe the same.
It should be noted that unless otherwise defined, technical or scientific terms used in the embodiments of the present disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which the present disclosure pertains. The terms "first," "second," and the like, as used in embodiments of the present disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
A constant power load may refer to a load that exhibits a constant characteristic of load power. And negative impedance characteristics may refer to characteristics of a circuit or electronic component that exhibit an increase in current and a decrease in voltage over a particular voltage or current range. In a dc micro grid, when a constant power load of an ac-dc converter connected to an ac distribution network presents a negative impedance characteristic, stability and reliability of the system may be compromised. Therefore, how to improve the stability and reliability of the system when the constant power load presents a negative impedance characteristic is a technical problem to be solved.
In view of this, the embodiment of the disclosure provides a control method for an ac-dc converter with a constant power load, which can quickly track the load change by observing the constant power load, quickly eliminate static errors, and improve the stability of the system.
Referring to fig. 1, fig. 1 shows a schematic main circuit diagram of an ac-dc converter according to an embodiment of the present disclosure. In fig. 1, the ac-dc converter includes a first inductor L a1 Second inductance L b1 And a third inductance L c1 First inductance L a1 Second inductance L b1 And a third inductance L c1 Is connected to the AC power grid N, the first inductor L a1 And the second end of the capacitor (C) a Is connected with the first end of the second inductor L b1 And a second capacitor C b Is connected with the first end of the third inductor L c1 And a third capacitor C c Is connected to the first end of the housing; first capacitor C a A second capacitor C b And a third capacitor C c Is connected to each other. First resistor G fa And a first capacitor C a Connected in parallel with a second resistor G fb And a second capacitor C b Connected in parallel, a third resistor G fc And a first capacitor C c Connected in parallel. Fourth inductance L a2 Is connected to the first inductor L a1 And a first capacitor C a A fourth inductance L a2 Is connected to the fourth resistor R a1 Is a first end of (2); fifth inductance L b2 Is connected to the second inductance L b1 And a second capacitor C b A fifth inductance L b2 Is connected to the fifth resistor R b1 Is a first end of (2); sixth inductance L c2 Is connected to the third inductance L c1 And a third capacitor C c A sixth inductance L c2 Is connected to the sixth resistor R c1 Is provided.
Fourth resistor R a1 Is connected to the first switch S a1 And a second switch S a2 A fifth resistor R b1 Is connected to the third switch S b1 And a fourth switch S b2 A sixth resistor R c1 Is connected to the fifth switch S c1 And a sixth switch S c2 Is connected to the connecting point of (c).
First switch S a1 A first end, a third switch S b1 And a fifth switch S c1 Is denoted as a first connection point; first switch S a1 And a second switch S a2 A third switch S connected to the first end of b1 Second and fourth switches S b2 A fifth switch S connected to the first end of c1 Second and sixth switches S c Is connected to the first end of the housing; and a second switch S a2 Second and fourth switches S b2 Second and sixth switches S c2 Is connected to each other and is denoted as second connection point.
DC capacitor C and DC side equivalent resistor R 2 And constant power load P CPL Is connected between the first connection point and the second connection point.
Referring to fig. 2, fig. 2 shows a schematic diagram of an ac-dc converter control method for a constant power load according to an embodiment of the present disclosure. As shown in fig. 2, the ac-dc converter control method for a constant power load may include:
step S210, based on the output current i of the switch unit in the AC-DC converter odc And a DC side voltage v dc Obtaining a power observation value P of a constant power load CPL *。
Specifically, power observations P CPL * It may be expressed as that,
p in the formula A Being intermediate variable values, γ being observer coefficients; r is R 2 Is the equivalent resistance value of the direct current side, C is the direct current capacitance, v dc Is the direct-current side voltage, i odc Is the output current of the switching unit.
Wherein the switching unit may comprise a first switch S in fig. 1 a1 To sixth switches S c2 Output current i of the switching unit odc Then the sum of the currents of the upper bridge arm, i.e. the first switch S a1 Third switch S b1 And a fifth switch S c1 Is set, and the sum of the currents of (a) and (b).
Step S220, based on the power observation value P CPL * Calculating a predicted value i of the output active current of the AC-DC converter od1 *。
In particular implementation, the predicted value i of the active current is output od1 * Can be expressed as:
v in d And v q I is the active and reactive components of the ac side line voltage oq Is the reactive component of the ac output current.
In some embodiments, the active component v of the alternating side line voltage d And reactive component v of ac side line voltage q Can be based on the alternating side line voltage v under the abc coordinate system ab 、v bc 、v ca And d, performing dq conversion calculation. For example, ac side phase voltage v oa 、v ob 、v oc May be the first switch S in FIG. 1 respectively a1 And a second switch S a2 A third switch S b1 And a fourth switch S b2 And a fifth switch S c1 And a sixth switch S c2 Voltage of connection point of (C) AC side line voltage v ab＝ v oa -v ob Ac side line voltage v bc＝ v ob -v oc Ac side line voltage v ca＝ v oc -v oa 。
In some embodiments, the active component i of the alternating side current od And reactive component i of the alternating side current oq Can be based on alternating side phase current i oa 、i ob 、i oc And d, performing dq conversion calculation. For example, an alternating side phase current i oa 、i ob 、i oc May be the fourth resistor R in FIG. 1 a1 Fifth resistor R b1 And a sixth resistor R c1 Is provided.
Step S230, based on the output DC voltage v dc And reference voltage v dc * Nonlinear proportional integral adjustment is carried out to obtain a reference current correction value delta i od *。
In some embodiments, step S230 may further include:
based on the output DC voltage v dc And reference voltage v dc * Obtaining an input deviation e;
nonlinear proportional integral adjustment is carried out based on the input deviation e to obtain a reference current correction value delta i od *。
In particular, as shown in FIG. 2, the reference current correction value Δi od * Can be expressed as:
k in p And k i Proportional and integral coefficients, respectively, fal is a nonlinear function, e=v dc *-v dc For input deviation, α is a coefficient between 0 and 1, the smaller α is, the faster the tracking speed is, but the filtering effect is deteriorated. Delta is a filter coefficient, and the larger delta is, the better the filter effect is.
Step S240, based on the reference current correction value Deltai od * And predictive value i od1 * Obtaining a reference active component i of the alternating output current od * . In particular, as shown in FIG. 2, the method is represented by i od1 * And Deltai od * Adding to obtain the reference active component i of the alternating output current od *。
Step S250, based on the reference active component i of the AC output current od * Traffic lightsActive component i of the current flowing in the line od Reactive component i of ac side current oq And a reference reactive component i of the ac output current oq * Obtaining an active component v of the output line voltage of the AC-DC converter od And reactive component v oq 。
In particular implementation, the active component v od And reactive component v oq Can be expressed as:
where L is the equivalent reactance, i.e. l=l a1 +L a2 ＝L b1 +L b2 ＝L c1 +L c2 R is the equivalent resistance, i.e. r=ra1=rb1=rc1, R 11 The damping coefficient is passively controlled.
In some embodiments, the reference reactive component i of the ac output current oq * May be 0.
Step S260, based on the active component v od And reactive component v oq And controlling a switching unit of the AC-DC converter.
In some embodiments, step S260 may further include:
the active component v od And reactive component v oq Performing dq inverse transformation to obtain an output voltage value of the abc coordinate system;
pulse modulation is carried out based on the output voltage value of the abc coordinate system, so that a driving signal of the switch unit is obtained;
and driving a switching unit of the AC-DC converter based on the driving signal.
It should be noted that fig. 2 is only an example, and is not intended to set the number of ac/dc converters, and may include one or more ac/dc converters, which may be connected in parallel, and may be independently controlled when multiple converters are connected in parallel, so as to further improve the stability of the system.
Referring to fig. 3 to 6, the initial state output is unloaded, a 5kW constant power load is input at time t4, the constant power load is suddenly changed from 5kW to-5 kW at time t5, fig. 3 shows ac voltage and current waveforms of the ac-dc converter according to the embodiment of the present disclosure, fig. 4 shows reference values and output values of active currents of the ac-dc converter according to the embodiment of the present disclosure, fig. 5 shows dc voltage reference values and output values of the ac-dc converter according to the embodiment of the present disclosure, and fig. 6 shows constant power load values and observed values of the ac-dc converter according to the embodiment of the present disclosure. As shown in fig. 3-6, by observing a constant power load, the power change can be detected quickly, without overshoot and ringing, reaching steady state for about 15ms, based on the method of the disclosed embodiments. The nonlinear proportional integral is adopted to adjust the input deviation, so that the error of the direct current voltage can be eliminated, the overshoot and the drop of the direct current voltage are small, the oscillation phenomenon does not exist, and the static difference can be eliminated in about 5-10 ms. The current instruction can be tracked quickly through passive control, so that the current instruction can be tracked quickly no matter in active step or active reverse, and the current instruction has good dynamic and static characteristics, thereby improving the reliability and stability of the power system.
Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the disclosure, including the claims, is limited to these examples; the technical features of the above embodiments or in the different embodiments may also be combined under the idea of the present disclosure, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present disclosure as described above, which are not provided in details for the sake of brevity.
Additionally, well-known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown within the provided figures, in order to simplify the illustration and discussion, and so as not to obscure the embodiments of the present disclosure. Furthermore, the devices may be shown in block diagram form in order to avoid obscuring the embodiments of the present disclosure, and this also accounts for the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform on which the embodiments of the present disclosure are to be implemented (i.e., such specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the disclosure, it should be apparent to one skilled in the art that embodiments of the disclosure can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative in nature and not as restrictive.
The disclosed embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Accordingly, any omissions, modifications, equivalents, improvements, and the like, which are within the spirit and principles of the embodiments of the disclosure, are intended to be included within the scope of the disclosure.
Claims (6)
1. A control method of an AC-DC converter based on a constant power load is characterized by comprising the following steps:
based on the output current i of the switch unit in the AC-DC converter odc And a DC side voltage v dc Obtaining a power observation value P of a constant power load CPL *；
Based on the power observations P CPL * Calculating a predicted value i of the output active current of the AC-DC converter od1 *；
Based on the DC side voltage v dc And reference voltage v dc * Nonlinear proportional integral adjustment is carried out to obtain a reference current correction value delta i od *；
Based on the reference current correction value Deltai od * And predictive value i od1 * Obtaining a reference active component i of the alternating output current od *；
A reference active component i based on the alternating output current od * Active component i of alternating side current od Reactive component i of ac side current oq And a reference reactive component i of the ac output current oq * Obtaining an active component v of the output line voltage of the AC-DC converter od And reactive component v oq ；
Based on the active component v od And reactive componentv oq The switching unit of the AC-DC converter is controlled;
wherein the power observation value P CPL * The method comprises the following steps:
wherein P is A Being intermediate variable values, γ being observer coefficients; r is R 2 Is the equivalent resistance value of the direct current side, C is the direct current capacitance, v dc Is the direct-current side voltage, i odc An output current of the switching unit;
the active component v od And the reactive component v oq The method comprises the following steps:
wherein L is an equivalent reactance value, R is an equivalent resistance value, R 11 The damping coefficient is passively controlled;
v d and v q I is the active and reactive components of the ac side line voltage oq Is the reactive component of the ac output current.
2. The method according to claim 1, wherein the predicted value i of the active current is output od1 * Is that
3. The method according to claim 1, characterized in that it is based on the dc side voltage v dc And reference voltage v dc * Nonlinear proportional integral adjustment is carried out to obtain a reference current correction value delta i od * Comprising:
based on the DC side voltage v dc And reference voltage v dc * Obtaining input deviatione；
Nonlinear proportional integral adjustment is carried out based on the input deviation e to obtain a reference current correction value delta i od *。
4. The method according to claim 1, wherein the reference current correction value Δi od * The method comprises the following steps:
k in p And k i Proportional and integral coefficients, respectively, fal is a nonlinear function, e=v dc *-v dc For input bias, α is a coefficient between 0 and 1, and δ is a filter coefficient.
5. The method according to claim 1, characterized in that based on the active component v od And reactive component v oq The control of the switching unit of the ac-dc converter comprises:
the active component v od And reactive component v oq Performing dq inverse transformation to obtain an output voltage value of the abc coordinate system;
pulse modulation is carried out based on the output voltage value of the abc coordinate system, so that a driving signal of the switch unit is obtained;
and driving a switching unit of the AC-DC converter based on the driving signal.
6. An ac-dc converter controlled by a method according to any one of claims 1-5.
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| US9136773B2 (en) * | 2011-09-09 | 2015-09-15 | Virginia Tech Intellectual Properties, Inc. | Method of evaluating and ensuring stability of AC/DC power systems |
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| CN101769232A (en) * | 2010-01-19 | 2010-07-07 | 南京航空航天大学 | Full wind speed power control method for fixed propeller pitch variable speed wind power generator set |
| CN203761297U (en) * | 2014-02-25 | 2014-08-06 | 江苏金思源电力科技有限公司 | Multipath direct current input bidirectional energy storage current transformer |
| CN112448407A (en) * | 2019-08-27 | 2021-03-05 | 华北电力大学（保定） | Impedance optimization control strategy for improving stability of grid-connected system under constant power control under bidirectional power flow |
| CN112003322A (en) * | 2020-08-12 | 2020-11-27 | 北方工业大学 | Method for designing control parameters of grid-connected converter of micro-grid system |
| CN112701720A (en) * | 2020-12-17 | 2021-04-23 | 电子科技大学 | Hybrid control strategy for constant power load of alternating-current micro-mesh belt |
| CN112701710A (en) * | 2021-01-12 | 2021-04-23 | 北方工业大学 | Energy storage converter stability control method based on alternating current constant power load dynamic performance |
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