CN104253543A - Oriented vector control method for virtual power grid magnetic flux linkage - Google Patents
Oriented vector control method for virtual power grid magnetic flux linkage Download PDFInfo
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- CN104253543A CN104253543A CN201310263108.5A CN201310263108A CN104253543A CN 104253543 A CN104253543 A CN 104253543A CN 201310263108 A CN201310263108 A CN 201310263108A CN 104253543 A CN104253543 A CN 104253543A
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- flux linkage
- vector control
- magnetic flux
- power grid
- control method
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Abstract
The invention discloses an oriented vector control method for a virtual power grid magnetic flux linkage. The oriented vector control method for the virtual power grid magnetic flux linkage comprises the following steps of estimating an alpha component and a beta component of the virtual power grid magnetic flux linkage by using two-phase current and switching signals of a bridge arm so as to obtain a sine value and a cosine value of theta; performing transformation of coordinates to obtain a d-axis virtual magnetic flux linkage oriented synchronous rotating coordinate system without a power grid voltage sensor; and implementing corresponding vector control. Compared with the traditional method without initial value observation, the oriented vector control method has the advantages that the magnetic flux linkage obtained by estimation is accurate, errors are small, current impact is low in a starting process of a PWM (pulse-width modulation) rectifier, the dynamic performance and the steady-state performance are high, and the technical scheme has a good application prospect.
Description
Technical field
The present invention relates to a kind of virtual electrical network flux linkage orientation vector control method.
Background technology
Along with Harmonic in Power System and idle problem are more and more serious, harmonics restraint and reactive power compensation technology become very important.In harmonics restraint and reactive power compensation technology, PWM commutation technique is a kind of actively effective method, and it obtains because of the advantage such as have that input current sine, power factor are controlled, energy in bidirectional flow, DC bus-bar voltage can control and anti-disturbance ability is strong and payes attention to widely.In the wind generating technology that regenerative resource develops, the variable speed constant frequency doubly-fed electricity generation system of a kind of AC excitation is used widely, the excitation converter of its generator should have good input, output characteristic, also must there is the ability of to and fro flow of power simultaneously, thus the AC-DC-AC unsteady flow mode of PWM rectification-PWM inversion is often adopted, in general PWM rectifier has more complicated structure and control problem, and thus cost is higher.
Summary of the invention
The defect that the present invention seeks to exist for prior art provides a kind of virtual electrical network flux linkage orientation vector control method.
The present invention for achieving the above object, adopts following technical scheme:
The present invention's virtual electrical network flux linkage orientation vector control method, it is characterized in that utilizing the switching signal of biphase current and brachium pontis to estimate α, β component of virtual electrical network magnetic linkage, and then obtain sine, the cosine value of θ, coordinate transform is carried out with this, obtain the synchronous rotating reference frame of the d axle Virtual shipyard orientation of sensorless, achieve corresponding vector control accordingly.
The magnetic linkage that the present invention obtains than traditional method estimation do not observed with initial value is accurate, error is little, little at PWM rectifier starting process rush of current, and having good dynamic and steady-state behaviour, is a kind of very promising technical scheme.
Accompanying drawing explanation
Fig. 1: structural representation of the present invention.
Embodiment
As shown in Figure 1, the present invention's virtual electrical network flux linkage orientation vector control method, it is characterized in that utilizing the switching signal of biphase current and brachium pontis to estimate α, β component of virtual electrical network magnetic linkage, and then obtain sine, the cosine value of θ, coordinate transform is carried out with this, obtain the synchronous rotating reference frame of the d axle Virtual shipyard orientation of sensorless, achieve corresponding vector control accordingly.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (1)
1. a virtual electrical network flux linkage orientation vector control method, it is characterized in that utilizing the switching signal of biphase current and brachium pontis to estimate α, β component of virtual electrical network magnetic linkage, and then obtain sine, the cosine value of θ, coordinate transform is carried out with this, obtain the synchronous rotating reference frame of the d axle Virtual shipyard orientation of sensorless, achieve corresponding vector control accordingly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310263108.5A CN104253543A (en) | 2013-06-27 | 2013-06-27 | Oriented vector control method for virtual power grid magnetic flux linkage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310263108.5A CN104253543A (en) | 2013-06-27 | 2013-06-27 | Oriented vector control method for virtual power grid magnetic flux linkage |
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| CN104253543A true CN104253543A (en) | 2014-12-31 |
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| CN201310263108.5A Pending CN104253543A (en) | 2013-06-27 | 2013-06-27 | Oriented vector control method for virtual power grid magnetic flux linkage |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868757A (en) * | 2015-05-15 | 2015-08-26 | 西安理工大学 | Method for estimating initial value of virtual flux linkage vector of PWM rectifier |
| CN105932713A (en) * | 2016-06-03 | 2016-09-07 | 国网江苏省电力公司常州供电公司 | Series quasi Z source inverter based grid-tied PV control method |
| CN111404406A (en) * | 2020-04-20 | 2020-07-10 | 上海应用技术大学 | PWM rectifier internal model control system and method based on virtual flux linkage orientation |
| CN112994482A (en) * | 2021-03-09 | 2021-06-18 | 北京科技大学 | Model prediction power dynamic compensation control method of double-PWM frequency conversion system |
-
2013
- 2013-06-27 CN CN201310263108.5A patent/CN104253543A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868757A (en) * | 2015-05-15 | 2015-08-26 | 西安理工大学 | Method for estimating initial value of virtual flux linkage vector of PWM rectifier |
| CN104868757B (en) * | 2015-05-15 | 2017-05-03 | 西安理工大学 | Method for estimating initial value of virtual flux linkage vector of PWM rectifier |
| CN105932713A (en) * | 2016-06-03 | 2016-09-07 | 国网江苏省电力公司常州供电公司 | Series quasi Z source inverter based grid-tied PV control method |
| CN111404406A (en) * | 2020-04-20 | 2020-07-10 | 上海应用技术大学 | PWM rectifier internal model control system and method based on virtual flux linkage orientation |
| CN112994482A (en) * | 2021-03-09 | 2021-06-18 | 北京科技大学 | Model prediction power dynamic compensation control method of double-PWM frequency conversion system |
| CN112994482B (en) * | 2021-03-09 | 2022-05-17 | 北京科技大学 | Model prediction power dynamic compensation control method of double-PWM frequency conversion system |
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Addressee: WUXI LEHUA AUTOMATION SCIENCE & TECHNOLOGY CO., LTD. Document name: Notification of Approving Refund |
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| C06 | Publication | ||
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20141231 |