CN106159970A - A kind of single-phase static reacance generator based on small capacitances and control method - Google Patents
A kind of single-phase static reacance generator based on small capacitances and control method Download PDFInfo
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- CN106159970A CN106159970A CN201610549844.0A CN201610549844A CN106159970A CN 106159970 A CN106159970 A CN 106159970A CN 201610549844 A CN201610549844 A CN 201610549844A CN 106159970 A CN106159970 A CN 106159970A
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- Prior art keywords
- igbt transistor
- brachium pontis
- tie point
- phase static
- voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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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]
Abstract
A kind of single-phase static reacance generator based on small capacitances and control method, including igbt transistor T1～T4, DC capacitor XC, igbt transistor T1～T4 reverse parallel connection respectively has diode D1～D4.Igbt transistor T1 connects with igbt transistor T2, constitutes the first brachium pontis, and the tie point of series connection is a；Igbt transistor T3 connects with igbt transistor T4, constitutes the second brachium pontis, and the tie point of series connection is b.First brachium pontis, the second brachium pontis are in parallel with DC capacitor XC respectively；Tie point a, tie point b are connected with the live wire L and zero line N of unidirectional electrical network respectively, are connected with current-limiting reactor X between tie point a and live wire LL.A kind of single-phase static reacance generator based on small capacitances of the present invention and control method, including circuit structure and control mode, it uses IGBT control and easily extend, and can supplement deficiency in terms of compensation capacity for the three-phase STATCOM, and can reach the purpose of Optimal Reactive Power control effect.
Description
Technical field
The present invention relates to control Reactive Power Balance field, be specifically related to idle of a kind of single-phase static based on small capacitances
Raw device and control method.
Background technology
Installing the major way that reactive-load compensation equipment is control Reactive Power Balance, it is also guarantee power grid security, stablizes
With the key equipment of reliability service, specifically include that static var compensator (SVC) and static reacance generator (STATCOM).Mesh
Before, SVC typically uses thyristor control, has the advantages such as controlled capacity is big, control is simple, but compensation precision is low, response speed
Slowly, harmonic content is high；STATCOM typically uses igbt (IGBT) to control, and its compensation effect is good, current harmonics
Content is low, but compensation capacity is not high, control is more complicated.Obviously, the pluses and minuses of the two have the feature of Typical symmetrical, and its essence is former
Because being to have employed different semiconductor switch.
Content of the invention
In order to improve the combination property of compensator, the present invention proposes the idle generation of a kind of single-phase static based on small capacitances
Device and control method, including circuit structure and control mode, it uses IGBT control and easily extend, can supplement three-phase
Deficiency in terms of compensation capacity for the STATCOM, and the purpose of Optimal Reactive Power control effect can be reached.
The technical solution adopted in the present invention is:
A kind of single-phase static reactive-load generator circuit topology based on small capacitances, including igbt transistor T1～T4, direct current
Electric capacity XC, igbt transistor T1～T4 reverse parallel connection respectively has diode D1～D4.
Igbt transistor T1 connects with igbt transistor T2, constitutes the first brachium pontis, and the tie point of series connection is a；
Igbt transistor T3 connects with igbt transistor T4, constitutes the second brachium pontis, and the tie point of series connection is b.
First brachium pontis, the second brachium pontis are in parallel with DC capacitor XC respectively；
Tie point a, tie point b are connected with the live wire L and zero line N of unidirectional electrical network respectively,
It is connected with current-limiting reactor X between tie point a and live wire LL。
A kind of single-phase static reacance generator modulator approach based on small capacitances, first sample DC capacitor XC voltage Ucap, with
High frequency constant amplitude value triangular carrier Ucar.Quadrature, obtains the triangular carrier V with sinusoidal envelope line featurecar., secondly arrange with reference to electricity
Pressure VREFOr-VREF, respectively as the modulating wave of two groups of igbt transistors on the first brachium pontis, the second brachium pontis, thus obtain G1～
Control signal G of IVⅠ～GⅣ, drive four igbt transistors to sequentially turn on, finally obtain output voltage Vout。
A kind of single-phase static reacance generator control method based on small capacitances, crosses to line voltage Ugrid and electric current
The monitoring of Igrid, calculates reactive power, with set reference voltage or power factor XREFAsk poor, it is thus achieved that control errors amount
error；Adoption rate integration control PI again, obtains modulated signal VREF；Finally use improved sinusoidal modulation method, obtain four
Control signal G of igbt transistorⅠ～GⅣ, the idle change of driving means responsive electricity grid, it is achieved idle stability contorting.
A kind of single-phase static reactive-load generator circuit topology based on small capacitances, is applied to Network Voltage Stability control or work(
Voltage or power factor error amount are converted into idle adjustment amount by rate factor correcting field, then control switch is led to by specific rule
Disconnected, thus realize the dynamic regulation of voltage or power factor.
A kind of single-phase static reacance generator based on small capacitances of the present invention and control method, with tradition STATCOM and SVC
Comparing, its major advantage includes three below aspect:
(1): selection of small DC capacitor, circuit structure is simple, easy to control, has higher power density and reliable
Property；
(2): use full-control type semiconductor switch IGBT, the controllability of device is strong, is conducive to improving dynamic reactive control effect
Really；
(3): extensibility is strong, it is easy to many groups are in parallel or connect by Y/ Δ mode in three-phase system, reactive compensation capacity
Greatly.
(4): the present invention is based on the in-depth analysis to STATCOM and SVC pluses and minuses, a kind of comprehensive solution party of proposition
Case, it had both had the former control accuracy height, the advantage of fast response time, and can be easy to again extension, promote and compensate as the latter
Capacity, thus improve the comprehensive compensation ability of device.
Brief description
The invention will be further described with embodiment below in conjunction with the accompanying drawings:
Fig. 1 is circuit topology and the control method figure of the present invention.
Fig. 2 is switch modulating method of the present invention and output voltage graph of a relation.
Fig. 3 is the control block diagram of the present invention.
Detailed description of the invention
A kind of single-phase static reacance generator based on small capacitances and control method, as it is shown in figure 1, include circuit topology,
Modulation system and three parts of control strategy, be specifically described as follows:
(1), circuit structure part includes igbt transistor T1～T4 (D containing anti-paralleled diode1～D4) and DC capacitor
XC, semiconductor switch is igbt (being called for short IGBT).Igbt transistor TxWith diode Dx(x=1～4) press
Conventional method inverse parallel, front two groups and rear two groups of difference two brachium pontis in series, each brachium pontis and DC capacitor XCEach other simultaneously
Connection relation, its midpoint a with b is connected with the live wire L and zero line N of single-phase electrical network respectively, and is connected a current-limiting reactor between a with L
XL。
(2), modulator approach part includes: first sampling DC capacitor voltage Ucap.(waveform is just being generally two times of power frequencies
String half-wave), with high frequency constant amplitude value triangular carrier Ucar.Quadrature, obtains the triangular carrier V with sinusoidal envelope line featurecar., its
Secondary reference voltage V is setREFOr-VREF, respectively as the modulating wave of two groups of semiconductor switch on two brachium pontis, thus obtain grid
Control signal G of I～IVⅠ～GⅣ, drive four igbt transistors to sequentially turn on, finally obtain output voltage Vout。
(3) control strategy part includes: with the size of voltage or power factor for control target, by sampling line voltage
Or electric current and with set reference value ask poor, as the error input signal of pi controller (PI), it is thus achieved that VREF, then pass through
(2) modulation system described in produces switch controlling signal.
Operation principle:
Single-phase static reactive-load generator circuit of the present invention topology, is mainly used in Network Voltage Stability control or power factor
Voltage or power factor error amount are converted into idle adjustment amount by correction field, more specific rule break-make pressed by control switch, thus
Realize the dynamic regulation of voltage or power factor.Specific works principle is described below:
As it is shown in figure 1, be structure and the switch modulation mode of circuit.Capacitive reactance is XCDC capacitor open with full controlled bridge
Closing wired in parallel, it is made up of four igbt transistors and anti-paralleled diode, and the switch on two brachium pontis is respectively as follows: T1-D1With
T2-D2、T3-D3And T4-D4, its bridge arm midpoint a with b is connected with the live wire L and zero line N of single-phase electrical network respectively, and connects between a and L
Connecing an impedance is XLCurrent-limiting reactor.
DC capacitor XCFor less DC capacitor, when output reactive power changes in 5kVar～10kVar, capacitance
C only has 400uF, and prior art typically wants more than 2000uF, and therefore, electric capacity can be reduced at least 4 times.
Fig. 1 also show the modulation system of the switch of four igbt transistors, the pass of on off state and output voltage values
System.Specifically as shown in Figure 2.Assume that AC network power frequency is f0, DC capacitor voltage Ucap.Waveform is half-sinusoid, and frequency is
2f0；Original carrier Ucar.For the triangular wave of constant amplitude, its frequency is fcar., amplitude is 1；By Ucap.With Ucar.It is multiplied and changed
The carrier wave V enteringcar., its amplitude presses the change of half-sinusoid rule；Determine modulating wave V according to the output idle size of targetREF, work as Vcar.
>VREFWhen, control T1Conducting, and T2Turn off；Work as Vcar.<VREFWhen, control T2Conducting, and T1Turn off；In addition, work as Vcar.>-VREFWhen,
Control T3Conducting, and T4Turn off；Work as Vcar.<-VREFWhen, control T4Conducting, and T3Turn off；I.e. obtain GⅠ～GⅣPulsewidth waveform.When
T1And T3Simultaneously turn on or T2And T4When simultaneously turning on, output voltage VoutIt is 0；Work as T1And T4When simultaneously turning on, output voltage
Vout=Ucap.；Work as T2And T3When simultaneously turning on, output voltage Vout=-Ucap.。
Make N=fcar./f0, when N=20 (or being equal to 20 integral multiples), as in figure 2 it is shown, at a carrier cycle [Tk,
Tk+1In], capacitance voltage size can be approximately considered and keep constant.Therefore, UcapWith VoutThe ratio of average voltage be constantly equal to turn on arteries and veins
The ratio of width, i.e. VREFWith Ucap.Amplitude ratio be equal to (τ1+τ2)/Tcar.。
As it is shown on figure 3, be the control block diagram of the present invention.First pass through to line voltage Ugrid and electric current Igrid is real-time
Detection, and use it for calculating reactive power, voltage magnitude or power factor, if output quantity is X；By X and reference quantity XREF(tool
Body is voltage magnitude or unity power factor) ask poor, output error amount error；Adoption rate integration control (PI), is adjusted again
Signal V processedREF；Finally, the modulator approach shown in Fig. 2 is used, control signal G of four IGBT of outputⅠ～GⅣ, drive
STATCOM, it is achieved electric network reactive-load controls.
Claims (4)
1. the single-phase static reactive-load generator circuit topology based on small capacitances, it is characterised in that:
Including igbt transistor T1～T4, DC capacitor XC, igbt transistor T1～T4 reverse parallel connection respectively have diode D1～
D4,
Igbt transistor T1 connects with igbt transistor T2, constitutes the first brachium pontis, and the tie point of series connection is a；
Igbt transistor T3 connects with igbt transistor T4, constitutes the second brachium pontis, and the tie point of series connection is b；
First brachium pontis, the second brachium pontis are in parallel with DC capacitor XC respectively；
Tie point a, tie point b are connected with the live wire L and zero line N of unidirectional electrical network respectively,
It is connected with current-limiting reactor X between tie point a and live wire LL。
2. use the single-phase static of a kind of single-phase static reactive-load generator circuit topology based on small capacitances as claimed in claim 1
Reacance generator modulator approach, it is characterised in that:
First sample DC capacitor XC voltage Ucap, with high frequency constant amplitude value triangular carrier Ucar.Quadrature, obtains having sinusoidal envelope line special
The triangular carrier V of pointcar., next arranges reference voltage VREFOr-VREF, respectively as on the first brachium pontis, the second brachium pontis two groups
The modulating wave of igbt transistor, thus obtain control signal G of G1～IVⅠ～GⅣ, drive four igbt transistors to lead successively
Logical, finally obtain output voltage Vout。
3. use the single-phase static of a kind of single-phase static reactive-load generator circuit topology based on small capacitances as claimed in claim 1
Reacance generator modulator approach, it is characterised in that:
Cross the monitoring to line voltage Ugrid and electric current Igrid, calculate reactive power, with set reference voltage or power because of
Number XREFAsk poor, it is thus achieved that control errors amount error；Adoption rate integration control PI again, obtains modulated signal VREF；Finally use and change
The sinusoidal modulation method entering, obtains control signal G of four igbt transistorsⅠ～GⅣ, the idle change of driving means responsive electricity grid
Change, it is achieved idle stability contorting.
4. a kind of single-phase static reactive-load generator circuit based on small capacitances is topological as claimed in claim 1, it is characterised in that: should
For Network Voltage Stability control or PFC field, voltage or power factor error amount are converted into idle adjustment
Amount, then control switch is by specific rule break-make, thus realize the dynamic regulation of voltage or power factor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610549844.0A CN106159970A (en) | 2016-07-13 | 2016-07-13 | A kind of single-phase static reacance generator based on small capacitances and control method |
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| CN201610549844.0A CN106159970A (en) | 2016-07-13 | 2016-07-13 | A kind of single-phase static reacance generator based on small capacitances and control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107046303A (en) * | 2016-11-29 | 2017-08-15 | 三峡大学 | A kind of equivalent idle battery circuit and its control method |
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| CN102142684A (en) * | 2011-03-18 | 2011-08-03 | 株洲变流技术国家工程研究中心有限公司 | High-voltage direct-hanging type scalable vector graphics (SVG) comprehensive control device and comprehensive control method |
| CN205811550U (en) * | 2016-07-13 | 2016-12-14 | 三峡大学 | A kind of single-phase static reactive-load generator circuit based on small capacitances topology |
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| CN102142684A (en) * | 2011-03-18 | 2011-08-03 | 株洲变流技术国家工程研究中心有限公司 | High-voltage direct-hanging type scalable vector graphics (SVG) comprehensive control device and comprehensive control method |
| CN205811550U (en) * | 2016-07-13 | 2016-12-14 | 三峡大学 | A kind of single-phase static reactive-load generator circuit based on small capacitances topology |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107046303A (en) * | 2016-11-29 | 2017-08-15 | 三峡大学 | A kind of equivalent idle battery circuit and its control method |
| CN107046303B (en) * | 2016-11-29 | 2023-06-02 | 三峡大学 | Equivalent reactive battery circuit and control method thereof |
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Application publication date: 20161123 |
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