CN116073676A - DC voltage self-adaptive adjustment method for three-phase current source type rectifier - Google Patents

DC voltage self-adaptive adjustment method for three-phase current source type rectifier Download PDF

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CN116073676A
CN116073676A CN202310021571.2A CN202310021571A CN116073676A CN 116073676 A CN116073676 A CN 116073676A CN 202310021571 A CN202310021571 A CN 202310021571A CN 116073676 A CN116073676 A CN 116073676A
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voltage
phase
current
rectifier
output voltage
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CN116073676B (en
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朱文杰
张纪轩
曹文平
胡存刚
李浩然
刘碧
芮涛
汪凤翔
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Anhui University
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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
    • 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
    • H02M1/0012—Control circuits using digital or numerical techniques
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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Abstract

The invention discloses a direct-current voltage self-adaptive adjustment method of a three-phase current source type rectifier, which comprises the following steps: determining a modulation degree below a minimum design input phase voltage of the rectifier, and constructing a mathematical model for representing a relation between the input phase voltage amplitude and the output voltage based on the modulation degree; separating positive and negative sequences of three-phase voltages on an alternating current side through a second-order generalized integrator, and obtaining current phase voltage amplitude information through coordinate transformation; substituting the current phase voltage amplitude information into the mathematical model to obtain a current output voltage; and taking the current output voltage as a closed-loop control instruction value to realize the self-adaptive tracking of the output voltage of the rectifier. The invention directly starts from the modulation degree of the current source rectifier, avoids the judgment of complex working state, ensures that the three-phase current source rectifier always works under a proper modulation degree, and prevents the voltage fluctuation of the direct current side caused by the jump of the input voltage.

Description

DC voltage self-adaptive adjustment method for three-phase current source type rectifier
Technical Field
The invention relates to the technical field of power electronic control, in particular to a three-phase current type PWM rectifier.
Background
At present, the three-phase PWM rectifier can ensure the sine of input current and simultaneously provide stable direct-current voltage for the electric appliances at the later stage; the three-phase PWM rectifiers are subdivided into three-phase voltage source rectifiers and three-phase current source rectifiers, depending on the structure. Compared with a three-phase voltage source rectifier, the three-phase current source rectifier has the characteristics of wide output voltage range, capability of starting adjustment from zero and limitation of short-circuit current.
In the working state of the three-phase current source rectifier, there is an overmodulation state, namely, the output voltage is set to be higher than the amplitude of the actual input phase voltage, the working duty ratio of each bridge arm MOS tube is increased to the maximum value in the state, and the direct current voltage of the rectifier is in a pulsation characteristic. This state is often the case of voltage drop of the three-phase ac voltage, and in this case, the dc voltage no longer meets the original design objective, and the dc current and the input current are severely distorted while the dc side voltage pulsates, which causes oscillation of the rear-stage power utilization system, and thus causes irreparable damage to the system.
Therefore, how to provide a method for adaptively adjusting the dc voltage of a three-phase current source type rectifier is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the invention provides a direct-current voltage self-adaptive adjustment method of a three-phase current source type rectifier, which overcomes the problem of abnormal system operation when the rectifier works in an overmodulation state by judging the complex working mode of the three-phase current source type rectifier.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a direct-current voltage self-adaptive adjustment method of a three-phase current source type rectifier comprises the following steps:
determining a modulation degree below a minimum design input phase voltage of the rectifier, and constructing a mathematical model for representing a relation between the input phase voltage amplitude and the output voltage based on the modulation degree;
separating positive and negative sequences of three-phase voltages on an alternating current side through a second-order generalized integrator, and obtaining current phase voltage amplitude information through coordinate transformation;
substituting the current phase voltage amplitude information into the mathematical model to obtain a current output voltage;
and taking the current output voltage as a closed-loop control instruction value to realize the self-adaptive tracking of the output voltage of the rectifier.
Further, the mathematical relationship among the modulation degree of the rectifier, the amplitude of the input phase voltage and the output voltage is as follows:
Figure BDA0004042546540000021
wherein M is the modulation degree of the rectifier,
Figure BDA0004042546540000022
for rectifier output voltage, < >>
Figure BDA0004042546540000023
Is the input phase voltage magnitude.
Further, a modulation degree lower than the minimum design input phase voltage of the rectifier is selected to be m=0.9, and the mathematical model is constructed, wherein the expression is as follows:
Figure BDA0004042546540000024
wherein V is dc For rated output voltage, V m_MIN Input voltage for the minimum design phase; if the current phase voltage amplitude is lower than the minimum design input phase voltage, then
Figure BDA0004042546540000026
And taking the rated output voltage as a closed-loop control command value if the current phase voltage amplitude is higher than or equal to the minimum design input phase voltage.
Further, the current phase voltage amplitude is calculated by:
clarke transformation is carried out on the three-phase alternating voltage, the transformed alpha-beta component is subjected to Park transformation through a second-order generalized integrator, positive and negative sequence components obtained through separation are subjected to Park transformation, and three-phase alternating voltage amplitude information is obtained.
Further, the Clarke transformation is as follows:
Figure BDA0004042546540000025
wherein v is a ，v b And v c For three-phase ac input voltage v α And v β Is the ac voltage quantity in the two-phase stationary coordinate system.
Further, after the transformed alpha-beta component passes through the second-order generalized integrator, the component in the alternating voltage is extracted as positive sequence
Figure BDA0004042546540000031
And negative sequence->
Figure BDA0004042546540000032
Then the method comprises the following steps of Park transformation:
Figure BDA0004042546540000033
wherein θ is the phase angle of the grid voltage output by the phase-locked loop,
Figure BDA0004042546540000034
and->
Figure BDA0004042546540000035
Is the positive d and q components of the grid voltage.
Further, the output voltage obtained by using the mathematical model is used as a reference value of closed-loop control, and the output of the rectifier is subjected to PI control to keep self-adaptive tracking of the reference value under the influence of the PI control.
Compared with the prior art, the invention discloses a direct-current voltage self-adaptive adjustment method of a three-phase current source rectifier, which is characterized in that a simple direct-current command voltage mathematical model is deduced by combining the relation between input phase voltage and output voltage according to the modulation degree of the three-phase current source rectifier, so that complex operation is avoided, and the method has great practical value for improving the output waveform of the three-phase current source rectifier and preventing the three-phase current source rectifier from working in an overmodulation state.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a dc voltage adaptive adjustment method of a three-phase current source rectifier according to the present invention;
FIG. 2 is a schematic diagram of a three-phase input voltage jump from 115 Vrms-57.5 Vrms-115 Vrms provided by an embodiment of the present invention;
FIG. 3 is a schematic diagram of phase voltage peak information obtained by a second-order generalized integrator of a three-phase input voltage according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a closed loop voltage reference value obtained by self-operation of a command voltage calculation formula under the condition that the modulation degree under low input voltage is 0.9 and the rated output voltage is 200V;
FIG. 5 is a schematic diagram showing a DC voltage target value according to an embodiment of the present invention;
FIG. 6 is a schematic diagram showing a change of a modulation degree of a rectifier according to an effective value of an input phase voltage according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of the DC voltage and current tracking closed-loop voltage reference values according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a three-phase input current tracking closed-loop voltage reference value according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention discloses a direct-current voltage self-adaptive adjustment method of a three-phase current source type rectifier, which comprises the following steps:
determining a modulation degree below a minimum design input phase voltage of the rectifier, and constructing a mathematical model for representing a relation between the input phase voltage amplitude and the output voltage based on the modulation degree;
separating positive and negative sequences of three-phase voltages on an alternating current side through a second-order generalized integrator, and obtaining current phase voltage amplitude information through coordinate transformation;
substituting the current phase voltage amplitude information into the mathematical model to obtain a current output voltage;
and taking the current output voltage as a closed-loop control instruction value to realize the self-adaptive tracking of the output voltage of the rectifier, so that the three-phase current source rectifier always works under a proper modulation degree.
Specifically, as shown in fig. 1, the main control flow of the embodiment of the present invention is: first sampling three-phase input voltage e a ，e b ，e c Obtaining positive and negative sequences of three-phase input voltage d-q through second-order generalized integrator (SOGI-QSG)Component(s)
Figure BDA0004042546540000041
Simultaneously, a phase-locked loop (PLL) is used for obtaining a power grid voltage phase angle theta, and the separated positive and negative sequence components and the power grid voltage phase angle are used for calculating a control instruction value; second, isolated->
Figure BDA0004042546540000051
The mathematical model for representing the relation between the input phase voltage amplitude and the output voltage is used for generating a closed-loop reference value, and the closed-loop reference value further influences a control command value through the PI controller, so that a complete closed-loop control flow of the three-phase current source rectifier is formed.
In one embodiment, the current phase voltage magnitude is calculated by:
clarke transformation is carried out on the three-phase alternating voltage, the transformed alpha-beta component is subjected to Park transformation through a second-order generalized integrator, positive and negative sequence components obtained through separation are subjected to Park transformation, and three-phase alternating voltage amplitude information is obtained.
Wherein, clarke transforms into:
Figure BDA0004042546540000052
wherein v is a ，v b And v c For three-phase ac input voltage v α And v β Is the ac voltage quantity in the two-phase stationary coordinate system.
As shown in FIGS. 2 and 3, v α And v β After passing through the second-order generalized integrator, the components in the alternating voltage are extracted as positive sequences
Figure BDA0004042546540000053
And negative sequence->
Figure BDA0004042546540000054
Then the method comprises the following steps of Park transformation:
Figure BDA0004042546540000055
wherein θ is the phase angle of the grid voltage output by the phase-locked loop,
Figure BDA0004042546540000056
and->
Figure BDA0004042546540000057
Is the positive d and q components of the grid voltage.
In one embodiment, the output voltage obtained by using the mathematical model is used as a reference value of closed-loop control, and the output of the rectifier is subjected to PI control to keep self-adaptive tracking of the reference value under the influence of PI control, so that the three-phase current source rectifier keeps a good working characteristic. The adaptive tracking, i.e. the output voltage will automatically follow the reference value change without manual adjustment, as long as the reference value is the target of closed loop control (PI control).
In one embodiment, the modulation degree of the three-phase current source rectifier is:
Figure BDA0004042546540000058
wherein M is the modulation degree of a three-phase current source rectifier,
Figure BDA0004042546540000061
for rectifier output voltage, V m Is the three-phase input phase voltage amplitude.
Further deriving the above to obtain the input phase voltage amplitude
Figure BDA0004042546540000062
The mathematical relationship with the output voltage is:
Figure BDA0004042546540000063
the modulation degree selection generally considers the voltage utilization rate and leaves a certain margin, so that M=0.9 is selected under the minimum design input phase voltage lower than the rectifier, and a mathematical model for representing the relation between the input phase voltage amplitude and the output voltage is constructed, wherein the expression is as follows:
Figure BDA0004042546540000064
wherein V is dc For rated output voltage, V m_MIN Input voltage for the minimum design phase; as shown in FIG. 4, if the magnitude of the current phase voltage is lower than the minimum design input phase voltage, then
Figure BDA0004042546540000065
And taking the rated output voltage as a closed-loop control command value if the current phase voltage amplitude is higher than or equal to the minimum design input phase voltage. Because of->
Figure BDA0004042546540000066
Having included the net side voltage amplitude information, in this embodiment +.>
Figure BDA0004042546540000067
Always 0. Thanks to the advantages of a second-order generalized integrator, even if the three-phase input is unbalanced +.>
Figure BDA0004042546540000068
And->
Figure BDA0004042546540000069
Can be well separated.
It should be noted that, the voltage utilization rate is 1 at the highest, the modulation degree is 1 at the same time, and a certain margin is generally reserved to deal with dynamic change in consideration of the actual working condition of the rectifier, so that it is reasonable to take 0.8-0.9.
In a specific embodiment, the modulation degree under low input voltage is 0.9, the rated direct current voltage is 200V, when the three-phase input voltage jumps from 115Vrms to 57.5Vrms to 115Vrms, the change of the closed loop voltage reference value is shown in figure 5, and the relationship between the modulation degree and the input phase voltage is shown in figure 6. And taking the obtained closed-loop voltage reference value as a target of PI control. The output voltage and the output current change as shown in fig. 7, at this time, under the action of PI control, the output voltage changes along with the change of the closed-loop voltage reference value, and when the three-phase input voltage jumps instantaneously, the output voltage does not have the over-modulation condition, and is quickly stabilized at the reference value after passing through an ac period. The three-phase input current changes as shown in fig. 8, and the three-phase input current is always in phase with the input voltage and is rapidly stabilized in one ac cycle.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (7)

1. A direct-current voltage self-adaptive adjustment method of a three-phase current source type rectifier is characterized by comprising the following steps:
determining a modulation degree below a minimum design input phase voltage of the rectifier, and constructing a mathematical model for representing a relation between the input phase voltage amplitude and the output voltage based on the modulation degree;
separating positive and negative sequences of three-phase voltages on an alternating current side through a second-order generalized integrator, and obtaining current phase voltage amplitude information through coordinate transformation;
substituting the current phase voltage amplitude information into the mathematical model to obtain a current output voltage;
and taking the current output voltage as a closed-loop control instruction value to realize the self-adaptive tracking of the output voltage of the rectifier.
2. The method for adaptively adjusting the direct current voltage of a three-phase current source type rectifier according to claim 1, wherein the mathematical relationship among the modulation degree of the rectifier, the amplitude of the input phase voltage and the output voltage is as follows:
Figure FDA0004042546530000011
wherein M is the modulation degree of the rectifier,
Figure FDA0004042546530000012
for rectifier output voltage, < >>
Figure FDA0004042546530000013
Is the input phase voltage magnitude.
3. The method for adaptively adjusting the dc voltage of a three-phase current source rectifier according to claim 2, wherein the modulation degree at the minimum design input phase voltage lower than the rectifier is selected to be m=0.9, and the mathematical model is constructed by the following expression:
Figure FDA0004042546530000014
wherein V is dc For rated output voltage, V m_MIN Input voltage for the minimum design phase; if the current phase voltage amplitude is lower than the minimum design input phaseVoltage is then
Figure FDA0004042546530000015
And taking the rated output voltage as a closed-loop control command value if the current phase voltage amplitude is higher than or equal to the minimum design input phase voltage.
4. The method for adaptively adjusting the direct current voltage of a three-phase current source type rectifier according to claim 1, wherein the current phase voltage amplitude is calculated by the following steps:
clarke transformation is carried out on the three-phase alternating voltage, the transformed alpha-beta component is subjected to Park transformation through a second-order generalized integrator, and positive and negative sequence components obtained through separation are subjected to Park transformation, so that the amplitude information of the three-phase alternating voltage is obtained.
5. The method for adaptively adjusting the direct current voltage of a three-phase current source type rectifier according to claim 4, wherein the Clarke transformation is as follows:
Figure FDA0004042546530000021
wherein v is a ，v b And v c For three-phase ac input voltage v α And v β Is the ac voltage quantity in the two-phase stationary coordinate system.
6. The method for adaptively adjusting DC voltage of three-phase current source rectifier according to claim 4, wherein after the transformed α - β component passes through a second-order generalized integrator, the component in the AC voltage is extracted as a positive sequence
Figure FDA0004042546530000022
And negative sequence->
Figure FDA0004042546530000023
Then the method comprises the following steps of Park transformation:
Figure FDA0004042546530000024
/>
wherein θ is the phase angle of the grid voltage output by the phase-locked loop,
Figure FDA0004042546530000025
and->
Figure FDA0004042546530000026
Is the positive d and q components of the grid voltage.
7. The method according to claim 1, wherein the output voltage obtained by using the mathematical model is used as a reference value of closed-loop control, and the output of the rectifier is subjected to PI control to keep track of the reference value under the influence of the PI control.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104218788A (en) * 2014-09-18 2014-12-17 广东省自动化研究所 Network side power factor sliding-mode self-adaptive control method of matrix rectifier
CN106877708A (en) * 2016-12-15 2017-06-20 广东省智能制造研究所 A kind of matrix rectifier control method and system with sliding formwork backoff algorithm
CN109120013A (en) * 2018-10-24 2019-01-01 云南电网有限责任公司电力科学研究院 A kind of method and device for grid adaptability detection device injection disturbance quantity

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104218788A (en) * 2014-09-18 2014-12-17 广东省自动化研究所 Network side power factor sliding-mode self-adaptive control method of matrix rectifier
CN106877708A (en) * 2016-12-15 2017-06-20 广东省智能制造研究所 A kind of matrix rectifier control method and system with sliding formwork backoff algorithm
CN109120013A (en) * 2018-10-24 2019-01-01 云南电网有限责任公司电力科学研究院 A kind of method and device for grid adaptability detection device injection disturbance quantity

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