CN104967132B - The chain type SVG DC side voltage control methods of star connection - Google Patents

The chain type SVG DC side voltage control methods of star connection Download PDF

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CN104967132B
CN104967132B CN201510307081.4A CN201510307081A CN104967132B CN 104967132 B CN104967132 B CN 104967132B CN 201510307081 A CN201510307081 A CN 201510307081A CN 104967132 B CN104967132 B CN 104967132B
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phase
positive sequence
chain link
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CN104967132A (en
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姚自立
郭智文
李晟
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Huatian Engineering and Technology Corp MCC
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Huatian Engineering and Technology Corp MCC
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    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/10—Flexible AC transmission systems [FACTS]

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Abstract

The invention discloses a kind of chain type SVG DC side voltage control methods of star connection, this method uses the control method that positive and negative sequence voltage injects to SVG DC voltage, the control method of negative sequence voltage injection is used for controlling SVG alternate DC voltage, and SVG alternate dc-voltage balance is realized by adjusting the negative sequence voltage of injection.The control method of positive sequence voltage injection is used for controlling SVG each chain link DC voltage, maintains each chain link DC voltage balanced by finely tuning the positive sequence voltage of each chain link injection.Control method of the present invention is that SVG DC voltage Balance routes can be achieved by software program, and strong antijamming capability is conducive to engineer applied.

Description

The chain type SVG DC side voltage control methods of star connection
Technical field
The invention belongs to the control technology field of power electronic equipment, more particularly to a kind of chain type SVG of star connection are straight Flow side voltage control method.
Background technology
The SVG device of chain structure has the advantages that small volume, modular construction produce and easily realize Redundant Control, when The more and more SVG devices using this structure of preceding high-voltage large-capacity reactive-load compensation.However, each of chain type SVG mutually includes multiple H Bridge chain section, the DC capacitor of each H bridge chain sections is separate, and the factor such as chain link otherness and trigger pulse delay causes chain link direct current Side Voltage unbalance, the balance control of H bridge chain section DC voltages is a key control technology of chain type SVG device.
The content of the invention
In view of the above-mentioned problems, the present invention provides a kind of control method of positive and negative sequence voltage injection to control the chain of star connection Formula SVG DC voltages.
To reach above-mentioned purpose, the chain type SVG DC side voltage control methods of star connection of the present invention, methods described includes Control method, the control method of negative sequence voltage injection of positive sequence voltage injection, wherein the control method of negative sequence voltage injection Including controlling SVG alternate dc-voltage balance, the control of the positive sequence voltage injection by adjusting each phase negative sequence voltage Method includes controlling the DC voltage of each chain link balanced by adjusting the positive sequence fundamental voltage of each chain link.
Specifically, the control method of described negative sequence voltage injection specifically includes following steps：
Each phase DC voltage is detected, the average value of each phase DC voltage is calculatedWithDescribed Average value is as follows：
With
DC voltage reference valueThe average value of each phase DC voltage is individually subtractedWithObtain Three differences obtain P respectively through proportion integral control deviceA、PBAnd PC；
Utilize PA、PBAnd PCCalculate the amplitude U of each phase negative sequence voltagenmWith initial phase αn, obtain each phase negative sequence voltage unA、 unBAnd unC；
Utilize PA、PBAnd PCCalculate the d axis components of forward-order currentPositive sequence uneoupled control obtains each phase positive sequence voltage upA、upBAnd upC；
Negative sequence voltage and positive sequence voltage superposition obtain each phase modulation voltage u of SVGA=upA+unA、uB=upB+unBAnd uC=upC +unC。
Specifically, the control method of described positive sequence voltage injection specifically includes following steps：
DC voltage reference valueThe DC voltage u of each each chain link of phase is individually subtracteddcA1、udcA2··· udcAn、udcB1、udcB2···udcBn、udcC1、···udcCn, obtained difference respectively through ratio P adjusters, ratio control As a result withEach phase positive sequence voltage upA、upBAnd upCIt is multiplied, obtains the amount trimmed △ u of chain link positive sequence voltagepA1、△upA2··· △upAn、△upB1、△upB2···△upBn、△upC1、△upC2···△upCn；
The amount trimmed of chain link positive sequence voltage withModulation voltage uA、uBAnd uCIt is added, obtains the modulation voltage of each chain linkChain link DC voltage Balance route is to pass through The amount trimmed of the positive sequence voltage of each chain link is controlled to realize.
The chain type SVG DC side voltage control methods of star connection of the present invention, positive-negative sequence is used to SVG DC voltage The control method of voltage injection, the control method of negative sequence voltage injection is that the alternate DC voltage for being directed to SVG is controlled, SVG alternate dc-voltage balance is maintained by negative sequence voltage.The control method of positive sequence voltage injection is for each of SVG Individual chain link DC voltage is controlled, and each chain link DC voltage is maintained by finely tuning the positive sequence voltage of each chain link injection It is balanced.Control method of the present invention is that SVG DC voltage Balance routes can be achieved by software program, without setting up additional circuit And equipment, system cost is reduced, system reliability is high, and strong antijamming capability is conducive to engineer applied.
Brief description of the drawings
Fig. 1 is the chain type SVG main circuit structure figures that the present invention is applied to star connection；
Fig. 2 is control block diagram of the present invention to the negative sequence voltage injection of SVG device DC voltage control；
Fig. 3 is that the present invention changes block diagram to the chain type SVG controlled quentity controlled variables of star connection；
Fig. 4 is the control block diagram that the present invention injects to the positive sequence voltage of SVG device A phase each chain link；
Fig. 5 is the control block diagram that the present invention injects to the positive sequence voltage of SVG device B phase each chain link；
Fig. 6 is the control block diagram that the present invention injects to the positive sequence voltage of SVG device C phase each chain link.
Embodiment
With reference to Figure of description, the present invention will be further described.
Embodiment
Cascaded as shown in figure 1, the chain type SVG main circuit topological structures of the present embodiment star connection are each by n H-bridge unit Form, corresponding reactance is LA、LBAnd LC, grid side voltage is uSA、uSBAnd uSC, SVG output voltage is uA、uBAnd uC.It is preferable In the case of SVG output voltage be only positive sequence voltage, increase negative phase-sequence electricity for the alternate DC voltage of Balance route SVG device Pressure, so SVG output voltage expression formula can be set to：
(1) in formula：UpmFor the amplitude of the SVG positive sequence voltages exported；UnmAnd αnFor the amplitude and phase angle of negative sequence voltage.
Zero-sequence current will not be produced in the chain type SVG of star connection, the electric current that SVG flows through is not considering the feelings of harmonic current There are positive sequence fundamental current and negative phase-sequence fundamental current under condition, its expression formula can be set to：
(2) in formula：IpmAnd βpThe amplitude and phase angle of forward-order current, I are exported for SVGnmAnd βnNegative-sequence current is exported for SVG Amplitude and phase angle.
As shown in Fig. 2 to 6, the controlling party of the positive and negative sequence voltage injection of the chain type SVG DC voltages of the star connection Method specifically includes following steps：
The positive sequence voltage of SVG injections is calculated as follows：
DC voltage reference valueThe DC voltage u of each each chain link of phase is individually subtracteddcA1、udcA2···udcAn、 udcB1、udcB2···udcBn、udcC1、···udcCn, obtained difference is respectively through ratio P adjusters, the knot of ratio control Fruit withEach phase positive sequence fundamental voltage upA、upBAnd upCIt is multiplied, obtains the amount trimmed △ u of chain link positive sequence fundamental voltagepA1、△ upA2···△upAn、△upB1、△upB2···△upBn、△upC1、△upC2···△upCn, also it is both the negative phase-sequence of injection Voltage.
The amount trimmed of chain link positive sequence fundamental voltage withModulation voltage uA、uBAnd uCIt is added, obtains the modulation electricity of each chain link PressureChain link DC voltage Balance route is logical The amount trimmed for the positive sequence fundamental voltage for controlling each chain link is crossed to realize.
The negative sequence voltage of SVG injections is calculated as follows：
SVG three phases active power is PA、PBAnd PC, its expression formula is as follows：
SVG general power P is added for three phases active power, and its expression formula is：
SVG mean powerFor general power divided by 3, its expression formula is：
SVG each phase active power, which subtracts mean power, to be obtained：
Being derived by (8) formula to obtain：
Being derived by (9) formula to obtain：
By (12) formula divided by (11) Shi Ke get：
If the item on the right of the equal sign of formula (13) is equal to k, then (13) formula can be exchanged into：
The initial phase α of negative sequence voltage can be obtained by being derived by (14) formulan：
The amplitude U of negative sequence voltage can be obtained by being derived by (11) formulanm：
As shown in Fig. 2 SVG positive sequence fundamental current is calculated as follows：
Being derived by (7) formula to obtain
The control that SVG injects through positive and negative sequence voltage, its DC voltage is realized balanced.
More than, only presently preferred embodiments of the present invention, but protection scope of the present invention is not limited thereto, and it is any to be familiar with sheet Those skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in should all be covered Within protection scope of the present invention.Therefore, the protection domain that protection scope of the present invention should be defined by claim is defined.

Claims (1)

1. a kind of chain type SVG DC side voltage control methods of star connection, it is characterised in that：Methods described includes SVG direct currents Control method, the control method of negative sequence voltage injection of the positive sequence voltage injection of side voltage, wherein negative sequence voltage injection Control method is used for adjusting SVG alternate dc-voltage balance, and the control method of the positive sequence voltage injection is used for adjusting SVG Each chain link DC voltage it is balanced；
The control method of described negative sequence voltage injection specifically includes following steps：
Each phase DC voltage is detected, the average value of each phase DC voltage is calculatedWithDescribed is averaged Value is as follows：
u d c A ‾ = 1 n ( u d c A 1 + u d c A 2 + ... + u d c A n ) ,
With
u d c C ‾ = 1 n ( u d c C 1 + u d c C 2 + ... + u d c C n ) ;
DC voltage reference valueThe average value of each phase DC voltage is individually subtractedWithObtain three differences Value obtains P respectively through proportion integral control deviceA、PBAnd PC；
Utilize PA、PBAnd PCCalculate the amplitude U for injecting each phase negative sequence voltagenmWith initial phase αn, obtain each phase negative sequence voltage unA、 unBAnd unC；
Utilize PA、PBAnd PCCalculate the d axis components of positive sequence fundamental currentPositive sequence uneoupled control obtains each phase positive sequence voltage upA、upBAnd upC；
Negative sequence voltage and positive sequence voltage superposition obtain each phase modulation voltage u of SVGA=upA+unA、uB=upB+unBAnd uC=upC+unC；
The control method of described positive sequence voltage injection specifically includes following steps：
DC voltage reference valueThe DC voltage u of each each chain link of phase is individually subtracteddcA1、udcA2...udcAn、udcB1、 udcB2...udcBn、udcC1、...udcC2...udcCnObtained difference respectively through ratio P adjusters, the result of ratio control with Each phase positive sequence fundamental voltage upA、upBAnd upCIt is multiplied, obtains the amount trimmed △ u of chain link positive sequence fundamental voltagepA1、△upA2...△ upAn、△upB1、△upB2...△upBn、△upC1、△upC2...△upCn；
The amount trimmed of chain link positive sequence fundamental voltage withModulation voltage uA、uBAnd uCIt is added, obtains the modulation voltage of each chain linkChain link DC voltage Balance route is to pass through The amount trimmed of the positive sequence voltage of each chain link is controlled to realize.
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CN105450038A (en) * 2015-12-29 2016-03-30 中国电力科学研究院 Modular H bridge cascade multi-level power electronic transformer control system
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CN104362651A (en) * 2014-11-27 2015-02-18 哈尔滨理工大学 Three-phase imbalance downward cascade type H-bridge static synchronous reactive compensation device and compensation method

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CN103311933A (en) * 2013-06-17 2013-09-18 哈尔滨九洲电气股份有限公司 Smooth transition type subsection PID (proportion integration differentiation) control method for chained static var generator
CN104362651A (en) * 2014-11-27 2015-02-18 哈尔滨理工大学 Three-phase imbalance downward cascade type H-bridge static synchronous reactive compensation device and compensation method

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