CN102244389A - Method for solving imbalance of three-phase currents and managing negative sequence based on SVG (scalable vector graphics) device - Google Patents
Method for solving imbalance of three-phase currents and managing negative sequence based on SVG (scalable vector graphics) device Download PDFInfo
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- CN102244389A CN102244389A CN2011101922154A CN201110192215A CN102244389A CN 102244389 A CN102244389 A CN 102244389A CN 2011101922154 A CN2011101922154 A CN 2011101922154A CN 201110192215 A CN201110192215 A CN 201110192215A CN 102244389 A CN102244389 A CN 102244389A
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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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
- Y02E40/40—Arrangements for reducing harmonics
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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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The invention relates to a method for solving the imbalance of three-phase currents and managing a negative sequence based on an SVG (scalable vector graphics) device. In the method, by taking the current signal variable quantity of a power grid as the controlled quantity, the current signal variable quantity of the power grid is subjected to filtering, phase shift, proportional amplification and operation to obtain currents which are same as the negative sequence currents of the power grid in size and then opposite to the negative sequence currents of the power grid in direction, thus a power unit of an all-controlled convertor assembly generates currents which can be offset with the negative sequence currents of the power grid, thereby reaching the purpose of managing the negative sequence. In the method, the all-controlled convertor assembly can solve the problems of the imbalance of the three-phase currents and the negative sequence of the power grid effectively; and the response speed is fast, the tracking accuracy is high, and the stability and reliability of the power grid can be improved greatly.
Description
Technical field
The present invention relates to a kind of method that solves three-phase current unbalance, administers negative phase-sequence, particularly a kind of method that adopts the SVG of full-control type current device to solve three-phase current unbalance, administers negative phase-sequence.
Background technology
Because exist single-phase load (such as electric railway) and three-phase asymmetric load (such as the arc furnace load) bring bad influence can for the operation and the efficient of electrical network in the electrical network, other power consumption equipments that also can be docked in this utility network simultaneously bring some bad influence even harm.Three-phase imbalance can produce negative-sequence current and cause electrical network negative phase-sequence protection action, influences power supply safety.Negative-sequence current injects the electric machinery load can cause the motor shaft vibration, can damage motor when serious.
At present, be in electrical network, to add SVC at the three-phase negative/positive problem-solving approach, adopt the Si Tanmaizi theory to solve.SVC realizes by changing impedance, quite distinguishes coilloading, electric capacity in other two-phase for a single-phase load.For the single-phase load two-phase or three alternate variations (being that uncertain which phase load is big), its capacitive must be by the maximum value calculation in the three-phase, and is required maximum induction of three-phase and maximum capacitor sum for the capacity of variable inductance.This by changing the mode that impedance comes regulation voltage, its regulating power is very weak.The ability of SVC compensation negative phase-sequence is the 20-25% of its total capacity.Investment material and occupation of land are all very big like this.Its major defect is as follows:
1) its installed capacity is big, and the occupation of land space is big, and own loss is big, the ventilation and heat difficulty.
2) self produces harmonic wave, needs the configuration suitable filters to come filtering.
3) the master control device of SVC is a thyristor, and its response speed does not reach desirable effect for fast-changing load slowly.
4) SVC output is influenced by line voltage, and its fan-out capability and line voltage square are directly proportional.
5) filter comes filtering by changing harmonic impedance into, can produce series parallel resonance in system, the harm power supply safety.
6) air-core reactor of TCR is to producing electromagnetic interference on every side.
At present, adopting static reacance generator SVG (the Static Var Generator) technology of full-control type current device to solve three-phase current unbalance at home and abroad, administering negative phase-sequence also is a blank.Therefore, the SVG solution at the negative phase-sequence problem has very strong exploitativeness and operability.
Summary of the invention
The purpose of this invention is to provide a kind of method based on SVG device solves three-phase current unbalance, improvement negative phase-sequence, this method adopts the full-control type current device, can effectively solve the problem of three-phase current unbalance, electrical network negative phase-sequence, and response speed is fast, the tracking accuracy height can improve the stability and the reliability of electrical network greatly.
For achieving the above object, the present invention is achieved through the following technical solutions:
Method based on SVG device solves three-phase current unbalance, improvement negative phase-sequence, this method is a controlled quentity controlled variable with the power network current change amount signal, power network current change amount signal via controller is carried out filtering, phase shift, ratio amplification, calculation process, obtain electric current with electrical network negative-sequence current opposite sign but equal magnitude, make the power cell of full-control type convertor assembly produce the electric current that offsets with the electrical network negative-sequence current, reach the purpose of administering negative phase-sequence.
Described full-control type convertor assembly is voltage-dropping type two level power unit parallel connection type SVG structures or voltage-dropping type three level power unit parallel connection type SVG structures.
Described full-control type convertor assembly is a voltage-dropping type Δ type chain type SVG structure.
Described full-control type convertor assembly is voltage-dropping type MMC type SVG structure or multipleization of voltage-dropping type SVG structure.
Described full-control type convertor assembly is non-voltage-dropping type device tandem type two level SVG structures or non-voltage-dropping type device tandem type three level SVG structures.
Described full-control type convertor assembly is direct hanging type Δ type chain type SVG structure or direct hanging type MMC type SVG structure.
Described controller comprises a plurality of signal processing subelements and master control subelement, and each signal processing subelement comprises filtration module, phase shift block, ratio amplification module, computing module, and the master control subelement is finished the control to the full-control type device;
Described filtration module comprises that low pass, high pass filter and power network current signal carry out the band pass filter of filtering respectively, being used for the power network current change amount signal is that the negative-sequence current signal filters low frequency, high frequency through low pass, high pass filter, handle through band pass filter again, obtain negative sequence component;
The negative-sequence current signal that described phase shift block is used for accepting filter unit output carries out phase place with the negative-sequence current signal and corrects;
Described ratio module is used for the negative-sequence current signal that phase shift is handled is carried out the ratio processing and amplifying;
Described computing module is used for that the negative-sequence current signal after phase shift, the ratio processing is weighted summation and handles the Comprehensive Control amount that obtains; This controlled quentity controlled variable is become the control signal of full-control type convertor assembly by functional operation.
Described full-control type semiconductor switch device that convertor assembly adopts can be IGBT, GTO, IGCT, IEGT or other full-controlled switch device.
Compared with prior art, the invention has the beneficial effects as follows:
1) response speed is fast
Distinguishing feature based on full-control type device convertor assembly is exactly that response speed is fast.Its main cause is to control arbitrarily the on off state of full-control type device (GTO, IGBT, IGCT, IEGT etc.) as required.And the switching frequency of device or equivalent switching frequency are often higher, and generally the switch number of times of each power frequency period can be from several times to tens times.Therefore, based on the system response time of full-control type device convertor assembly fast several times than SVC.
2) control precision height
Based on full-control type device convertor assembly can adopt pulse-width modulation or pulse to hit mode such as phase shift to control, add that its switching frequency is higher, just can each switch periods to system output regulate.In addition, system can also adopt the algorithm and the control method of more complicated, makes the tracking accuracy of system improve greatly.That is to say, can carry out the comprehensive regulation simultaneously to power quality problems such as idle, the harmonic wave of system, negative phase-sequences based on full-control type device convertor assembly.
3) not influenced by system voltage
SVC is made up of thyristor-controlled reactor and FC, and FC output is idle square to be directly proportional with line voltage.When grid voltage change is bigger, the basic current of FC increases when the voltage crest, and filter effect reduces, and first-harmonic overvoltage or the superpotential problem of harmonic wave overcurrent can appear in capacitor.And be a kind of active solution based on full-control type device convertor assembly, its output offset current almost has nothing to do with line voltage.The effect of administering negative phase-sequence is unaffected.
Description of drawings
Fig. 1 is based on SVG device solves three-phase current unbalance, administers the method main wiring diagram of negative phase-sequence;
Fig. 2 is based on SVG device solves three-phase current unbalance, administers the method control principle figure of negative phase-sequence;
Fig. 3 is the SVG control block diagram when adopting indirect current control method (voltage method);
Fig. 4 is the SVG control block diagram when adopting Direct Current Control method (current method);
Fig. 5 is voltage-dropping type two level power unit parallel connection type SVG structural representations;
Fig. 6 is voltage-dropping type three level power unit parallel connection type SVG structural representations;
Fig. 7 is a voltage-dropping type Δ type chain type SVG structural representation;
Fig. 8 is a voltage-dropping type MMC type SVG structural representation;
Fig. 9 is multipleization of a voltage-dropping type SVG structural representation;
Figure 10 is non-voltage-dropping type device tandem type two level SVG structural representations;
Figure 11 is non-voltage-dropping type device tandem type three level SVG structural representations;
Figure 12 is a direct hanging type Δ type chain type SVG structural representation;
Figure 13 is a direct hanging type MMC type SVG structural representation.
Embodiment
Be described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.
See Fig. 1, the method of a kind of solution three-phase current unbalance, improvement negative phase-sequence based on full-control type convertor assembly SVG, this method is a controlled quentity controlled variable with the power network current change amount signal, power network current change amount signal via controller is carried out filtering, phase shift, ratio amplification, calculation process, the power network current signal is carried out Fu Li leaf-size class number to launch, obtain electric current with electrical network negative-sequence current opposite sign but equal magnitude, make the power cell of full-control type convertor assembly produce the electric current that offsets with the electrical network negative-sequence current, reach the purpose of administering negative phase-sequence.
According to user's needs, can on the 35kV bus, set up FC inductance capacitance device, or not add the FC canceller.
See Fig. 2, controller comprises a plurality of signal processing subelements and master control subelement, and each signal processing subelement comprises filtration module, phase shift block, ratio amplification module, computing module, and the master control subelement is finished the control to the full-control type device;
The method of a kind of solution three-phase current unbalance, improvement negative phase-sequence based on full-control type convertor assembly SVG, control method may further comprise the steps:
1) detection of grid current signal changes into digital signal with the current signal (5A, 1A) of simulating and gives controller;
2) filtering; The power network current change amount signal is filtered high and low frequency through the low pass high pass filter, carry out bandpass filtering through the band pass filter in the band pass filter again, obtain electrical network negative-sequence current signal;
3) phase place is corrected; The phase shift block that above-mentioned current signal is crossed is respectively separately again corrected phase place;
4) ratio is amplified; Signal after the rectification phase place carries out the gain ratio through the ratio amplification module again and amplifies;
5) calculation process; Through correct that phase place, ratio amplify the gained negative-sequence current, draw the Comprehensive Control amount;
6) above-mentioned Comprehensive Control amount becomes the IGBT triggering constantly through function.Controller is that synchronizing signal control IGBT triggers constantly with the PT signal, make produce in the SVG device with electrical network in the current signal of negative phase-sequence opposite sign but equal magnitude offset with the negative-sequence current in the former electrical network, reach elimination negative phase-sequence purpose.
In the present embodiment, the full-control type current device is IGBT, also can be IGBT, GTO, IGCT, IEGT or other full-controlled switch device.
The SVG device comprises two types of voltage-dropping type and direct hanging types, and FC partly belongs to optional part.
In addition, an IGBT among the figure can be single Zhi Kaiguan device, also can be the serial or parallel connection of many IGBT.
Fig. 3 is the SVG control block diagram when adopting indirect current control method (voltage method).
Fig. 4 is the SVG control block diagram when adopting Direct Current Control method (current method).
Concrete structure type below in conjunction with accompanying drawing narration SVG device.
Fig. 5 is voltage-dropping type two level power unit parallel connection type SVG structural representations; Power cell is every to be made up of two inverse parallel switching device IGBT1, diode D1 rectification, and whole power model forms two level current transformer functions.
Voltage-dropping type two level power unit parallel connection type SVG are by the power cell parallel connection of adopting two level current transformers, rise to high-voltage parallel on electrical network by transformer T1 then.Voltage-dropping type two level power unit parallel connection type SVG mainly are made up of power cell, control unit, step-down transformer.
Fig. 6 is voltage-dropping type three level power unit parallel connection type SVG structural representations; Power cell is every to be made up of four inverse parallel switching device IGBT2, diode D2 clamper, and whole power model forms the three-level current transformer function.
Voltage-dropping type three level power unit parallel connection type SVG are by the power cell parallel connection of the three-level current transformer that adopts diode D2 clamper, rise to high-voltage parallel on electrical network by transformer T2 then.Voltage-dropping type three level power unit parallel connection type SVG mainly are made up of power cell, control unit, step-down transformer.
Fig. 7 is a voltage-dropping type Δ type chain type SVG structural representation; Individual event power cell A1 is every to be made up of four inverse parallel switching device IGBT3, diode D3 rectification, and whole power model forms the three-level current transformer function.
Voltage-dropping type Δ type chain type SVG is connected in series to the certain voltage grade by individual event power cell A1, and the three-phase Δ connects the back and rises to high-voltage parallel on electrical network by transformer T3.Voltage-dropping type Δ type chain type SVG mainly is made up of power cell, control unit, step-down transformer.
Fig. 8 is a voltage-dropping type MMC type SVG structural representation; The abbreviation of modular multilevel current transformer (Modular Multilevel Converter) is a MMC type current transformer.MMC type current transformer and three-phase bridge current transformer are similar.Each brachium pontis is composed in series by a plurality of single-phase semi-bridge A3 that IGBT5 forms, and each brachium pontis mid point inserts step-down transformer T5 secondary side behind reactor L1.
Fig. 9 is multipleization of a voltage-dropping type SVG structural representation; Multipleization of voltage-dropping type SVG is by a plurality of transformer T1, T2 ... Tn forms, and wherein, all current transformers 10 can shared one or more dc capacitor C, also can dispose electric capacity separately, and the effect of electric capacity is to provide operate as normal required direct voltage to current transformer.Current transformer 10 is made of three with common DC bus single-phase H bridges usually, and the output of each H bridge is connected to the low-pressure side of transformer.In the high-pressure side of each transformer, corresponding incorporate system into after respectively being in series.In addition, the method for the former secondary phase shift of transformer is adopted in the influence that the low-order harmonic that produces for the cancellation current transformer causes electrical network usually, connect as Y/Y, or the Y/ Δ connects.
Figure 10 is non-voltage-dropping type device tandem type two level SVG structural representations; Non-voltage-dropping type device tandem type two level SVG form high-voltage power unit A4 by power device IGBT6 series connection earlier, and the high-voltage power unit A4 of these power device series connection reconstructs the output of two level and inserts electrical network then.Non-voltage-dropping type device tandem type two level SVG mainly are made up of power device Series Sheet unit, control unit, access reactor.
Figure 11 is non-voltage-dropping type device tandem type three level SVG structural representations; Non-voltage-dropping type device tandem type three level SVG form high-voltage power unit A5 by power device IGBT7 series connection earlier, and the high-voltage power unit A5 of these power device series connection reconstructs the output of three level and inserts electrical network then.Non-voltage-dropping type device tandem type three level SVG mainly are made up of power device Series Sheet unit, control unit, access reactor.
Figure 12 is a direct hanging type Δ type chain type SVG structural representation; Individual event power cell A6 is every to be made up of four inverse parallel switching device IGBT8, diode D9 rectification, and whole power model forms the three-level current transformer function.
Direct hanging type Δ type chain type SVG directly is connected in series to voltage levels by individual event power cell A6, and the three-phase Δ connects the back and directly inserts electrical network.Direct hanging type Δ type chain type SVG mainly is made up of power cell, control unit, access reactor.
Figure 13 is a direct hanging type MMC type SVG structural representation.Each brachium pontis of MMC type current transformer is composed in series by a plurality of single-phase semi-bridge A8, and each brachium pontis mid point directly inserts electrical network through reactor L2, does not need step-down transformer.
Claims (8)
- One kind based on SVG device solves three-phase current unbalance, administer the method for negative phase-sequence, it is characterized in that, this method is a controlled quentity controlled variable with the power network current change amount signal, power network current change amount signal via controller is carried out filtering, phase shift, ratio amplification, calculation process, obtain electric current with electrical network negative-sequence current opposite sign but equal magnitude, make the power cell of full-control type convertor assembly produce the electric current that offsets with the electrical network negative-sequence current, reach the purpose of administering negative phase-sequence.
- 2. the method based on SVG device solves three-phase current unbalance, improvement negative phase-sequence according to claim 1, it is characterized in that described full-control type convertor assembly is voltage-dropping type two level power unit parallel connection type SVG structures or voltage-dropping type three level power unit parallel connection type SVG structures.
- 3. the method based on SVG device solves three-phase current unbalance, improvement negative phase-sequence according to claim 1 is characterized in that described full-control type convertor assembly is a voltage-dropping type Δ type chain type SVG structure.
- 4. the method based on SVG device solves three-phase current unbalance, improvement negative phase-sequence according to claim 1 is characterized in that described full-control type convertor assembly is voltage-dropping type MMC type SVG structure or multipleization of voltage-dropping type SVG structure.
- 5. according to claim 1 based on SVG device solves three-phase current unbalance, improvement negative phase-sequence method, it is characterized in that described full-control type convertor assembly is non-voltage-dropping type device tandem type two level SVG structures or non-voltage-dropping type device tandem type three level SVG structures.
- 6. the method based on SVG device solves three-phase current unbalance, improvement negative phase-sequence according to claim 1 is characterized in that described full-control type convertor assembly is direct hanging type Δ type chain type SVG structure or direct hanging type MMC type SVG structure.
- 7. the method based on SVG device solves three-phase current unbalance, improvement negative phase-sequence according to claim 1, it is characterized in that, described controller comprises a plurality of signal processing subelements and master control subelement, each signal processing subelement comprises filtration module, phase shift block, ratio amplification module, computing module, and the master control subelement is finished the control to the full-control type device;Described filtration module comprises that low pass, high pass filter and power network current signal carry out the band pass filter of filtering respectively, being used for the power network current change amount signal is that the negative-sequence current signal filters low frequency, high frequency through low pass, high pass filter, handle through band pass filter again, obtain negative sequence component;The negative-sequence current signal that described phase shift block is used for accepting filter unit output carries out phase place with the negative-sequence current signal and corrects;Described ratio module is used for the negative-sequence current signal that phase shift is handled is carried out the ratio processing and amplifying;Described computing module is used for that the negative-sequence current signal after phase shift, the ratio processing is weighted summation and handles the Comprehensive Control amount that obtains; This controlled quentity controlled variable is become the control signal of full-control type convertor assembly by functional operation.
- 8. according to any described method among the claim 1-6 based on SVG device solves three-phase current unbalance, improvement negative phase-sequence, it is characterized in that described full-control type semiconductor switch device that convertor assembly adopts can be IGBT, GTO, IGCT, IEGT or other full-controlled switch device.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102496939A (en) * | 2011-12-01 | 2012-06-13 | 华北电网有限公司唐山供电公司 | High-voltage static VAR generator (SVG) capable of being operated in parallel and controlled under constant voltage |
| CN103457266A (en) * | 2013-09-16 | 2013-12-18 | 国网河南省电力公司焦作供电公司 | Parallel-connection-type active filter and current detection method thereof |
| CN104300563A (en) * | 2014-10-28 | 2015-01-21 | 国网辽宁省电力有限公司朝阳供电公司 | Method for solving unbalance of three-phase currents and handling negative sequence |
| CN104578097A (en) * | 2014-12-28 | 2015-04-29 | 国网山东省电力公司日照供电公司 | Voltage gain adjusting device and control method of chained SVG controller |
| CN106655735A (en) * | 2016-11-03 | 2017-05-10 | 广东明阳龙源电力电子有限公司 | Low-frequency control method based on modular multi-level converter device |
| CN106998069A (en) * | 2016-01-26 | 2017-08-01 | Ls 产电株式会社 | Control device and method in SVC system |
| US9851769B2 (en) | 2013-07-04 | 2017-12-26 | Abb Schweiz Ag | Method for balancing a chain-link converter in delta configuration |
| CN107968418A (en) * | 2017-12-15 | 2018-04-27 | 国网江苏省电力有限公司淮安供电分公司 | Three-phase grid-connected converter electric current based on low capacity negative phase-sequence module is into control circuit |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102496939A (en) * | 2011-12-01 | 2012-06-13 | 华北电网有限公司唐山供电公司 | High-voltage static VAR generator (SVG) capable of being operated in parallel and controlled under constant voltage |
| US9851769B2 (en) | 2013-07-04 | 2017-12-26 | Abb Schweiz Ag | Method for balancing a chain-link converter in delta configuration |
| CN103457266A (en) * | 2013-09-16 | 2013-12-18 | 国网河南省电力公司焦作供电公司 | Parallel-connection-type active filter and current detection method thereof |
| CN104300563A (en) * | 2014-10-28 | 2015-01-21 | 国网辽宁省电力有限公司朝阳供电公司 | Method for solving unbalance of three-phase currents and handling negative sequence |
| CN104578097A (en) * | 2014-12-28 | 2015-04-29 | 国网山东省电力公司日照供电公司 | Voltage gain adjusting device and control method of chained SVG controller |
| CN106998069A (en) * | 2016-01-26 | 2017-08-01 | Ls 产电株式会社 | Control device and method in SVC system |
| CN106998069B (en) * | 2016-01-26 | 2019-12-31 | Ls 产电株式会社 | Control device and method in a static var compensator system |
| CN106655735A (en) * | 2016-11-03 | 2017-05-10 | 广东明阳龙源电力电子有限公司 | Low-frequency control method based on modular multi-level converter device |
| CN107968418A (en) * | 2017-12-15 | 2018-04-27 | 国网江苏省电力有限公司淮安供电分公司 | Three-phase grid-connected converter electric current based on low capacity negative phase-sequence module is into control circuit |
| CN107968418B (en) * | 2017-12-15 | 2020-12-22 | 国网江苏省电力有限公司淮安供电分公司 | Three-phase grid-connected converter current symmetry control circuit based on small-capacity high-frequency negative sequence module |
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