CN106099881A - For the lossless damping circuit of power distribution network serial connection capacitor compensating device - Google Patents
For the lossless damping circuit of power distribution network serial connection capacitor compensating device Download PDFInfo
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- CN106099881A CN106099881A CN201610407016.3A CN201610407016A CN106099881A CN 106099881 A CN106099881 A CN 106099881A CN 201610407016 A CN201610407016 A CN 201610407016A CN 106099881 A CN106099881 A CN 106099881A
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- damping
- pass switch
- resistance
- lossless
- circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
-
- 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
-
- 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
- Y02E40/30—Reactive power compensation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The present invention relates to a kind of for the lossless damping circuit of power distribution network serial connection capacitor compensating device, compensation device includes Capacitor banks, lossless damping circuit includes the damping branch road being connected and constituting loop with Capacitor banks, this damping branch road includes interconnective damping resistance and the first by-pass switch, lossless damping circuit also includes the second by-pass switch being connected and constituting loop with Capacitor banks, the second by-pass switch and damping branch circuit parallel connection；After specifying time delay after first by-pass switch Guan Bi, the second by-pass switch Guan Bi, after the first by-pass switch, Capacitor banks is discharged by damping branch road, damping resistance suppression maximum discharge current and frequency, after the second by-pass switch Guan Bi, Capacitor banks is discharged by the second by-pass switch.Compared with prior art, after two-stage of the present invention bypass, the parts such as non-resistance device R and reactor L access loop for a long time, without insertion loss, and the bypass mode being electrified for a long time relative to traditional RL damping circuit, the most energy-conservation.
Description
Technical field
The present invention relates to low pressure and administer field, especially relate to a kind of lossless for power distribution network serial connection capacitor compensating device
Consumption damping circuit.
Background technology
Utilize the centrality condensance that series connection Capacitor banks on the line is formed, the distributivity inductance on compensated line
Impedance, can reach to increase circuit transmission capacity, improve distribution voltage quality, and improve the power load distributing feelings between each circuit in parallel
Condition is to reduce the purpose of total losses, and current power distribution network serial connection capacitor compensating device is administered field at power distribution network " low-voltage " and obtained
Extensive application.
One Key technique problem of power distribution network serial connection capacitor compensating device is bypass discharge loop parameter designing, because
Higher working voltage is there is in capacitor in running, if by-pass switch directly closes, and capacitor end voltage jump, will
Produce the oscillating discharge electric current that peak value is the highest, capacitor and switchgear all being worked the mischief, if not taking restriction, joining
Line series capacitor compensation device will be unable to long-term safety, stable operation.
Be widely used at present is that electric discharge damping circuit is opened by sealing in bypass after damped resistor and damping reactor parallel connection
Closing loop, due to resistor, the existence of reactor, equipment bypass necessarily leads to insertion loss when running, and reactor is the most stupid
Weight, bulky.Herein according to power distribution network serial connection capacitor compensating device operation characteristic, work out a kind of lossless bypass and return
Road, equipment volume, weight is all decreased obviously, and there is not insertion loss, and technical-economic index is superior.
Summary of the invention
Defect that the purpose of the present invention is contemplated to overcome above-mentioned prior art to exist and provide a kind of for power distribution network string
The connection lossless damping circuit of power capacitor reactive compensation installation.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of for the lossless damping circuit of power distribution network serial connection capacitor compensating device, described compensation device includes capacitor
Group, described lossless damping circuit includes the damping branch road being connected and constituting loop with described Capacitor banks, this damping branch road bag
Including interconnective damping resistance and the first by-pass switch, described lossless damping circuit also includes being connected with described Capacitor banks
And constitute second by-pass switch in loop, described second by-pass switch and described damping branch circuit parallel connection；
After specifying time delay after first by-pass switch Guan Bi, the second by-pass switch Guan Bi, after the first by-pass switch, Capacitor banks
Discharged by damping branch road, described damping resistance suppression maximum discharge current and frequency, after the second by-pass switch Guan Bi, capacitor
Group is discharged by the second by-pass switch.
Described first by-pass switch and the second by-pass switch are vacuum circuit breaker
Described first by-pass switch and the second by-pass switch are vacuum contactor.
Described damping resistance is: resistance is the resistance of the specified capacitive reactance of Capacitor banks 10%～20%.
Described damping resistance is: resistance is the resistance of the specified capacitive reactance of Capacitor banks 15%.
Described appointment time delay is 0.02 second.
Compared with prior art, the invention have the advantages that
1), after two-stage bypass, the parts such as non-resistance device R and reactor L access loop, for a long time without insertion loss, relative to biography
The bypass mode that system RL damping circuit is electrified for a long time, the most energy-conservation.
2) damping resistance major limitation discharge current, need not consider the most through-flow loss problem during design, value is permissible
More bigger than the resistance value in traditional RL damping circuit, design relatively easy.
3) eliminate damping reactor, be instead of technology maturation, simple and reliable vacuum circuit breaker or vacuum contactor.
4) if the resistance of damping resistance is less than the 10% of the specified capacitive reactance of Capacitor banks, then current limitation effect is inconspicuous, still can produce
Capacitor and switchgear are all worked the mischief by the oscillating discharge electric current that raw peak value is higher, if resistance is more than the specified appearance of Capacitor banks
Anti-20%, then can cause the rising of cost, therefore according to 10%～20% selection of the specified capacitive reactance of series capacitor bank, permissible
Obtain preferable current limitation effect.
5) resistance of damping resistance takes the 15% of the specified capacitive reactance of Capacitor banks, due to damping resistance major limitation electric discharge electricity
Stream, need not consider the most through-flow loss problem during design, value is more bigger than the resistance value in traditional RL damping circuit, designs phase
To simply, best results.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
Equivalent circuit when Fig. 2 is to discharge without series capacitor during out-damping loop；
Discharge current schematic diagram when Fig. 3 is to discharge without series capacitor during out-damping loop；
Equivalent circuit during series capacitor electric discharge when Fig. 4 is for installing damping resistance additional；
Discharge current schematic diagram during series capacitor electric discharge when Fig. 5 is for installing damping resistance additional；
Fig. 6 is Capacitor banks current waveform schematic diagram；
Fig. 7 is damping resistance current waveform schematic diagram；
Wherein: C-Capacitor banks, R-damping resistance, DL1-the second by-pass switch, DL2-the first by-pass switch, R*-is distributed
Resistance, L*-distributed reactance.
Detailed description of the invention
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implement, give detailed embodiment and concrete operating process, but protection scope of the present invention be not limited to
Following embodiment.
When by-pass switch closes a floodgate, if do not installed damping circuit additional, loop resistance is the least, capacitor will with high frequency, amplitude and
Decaying periodic discharge current discharge slowly, this is the most unfavorable to other equipment in capacitor itself and discharge loop.Cause
This, access damping resistance R in discharge loop.The effect of R is limiting capacitance device discharge current amplitude, and consumes electric discharge energy
Amount, makes discharge current quickly decay.The effect of L is for having when power frequency load current flows through R when reducing by-pass switch combined floodgate
Merit is lost, and suitably selects the ratio of R Yu L, power frequency load current can be made mainly to flow through from reactance, and capacitor high-frequency discharge is electric
Stream mainly flows through from resistance.
There is following tripartite's planar defect in conventional damper loop:
1) when by-pass switch closes, power frequency load current passes through resistance R and inductance L, necessarily leads to certain insertion and damages
Consumption, loss size and damping circuit parameter and line current size determine；
2) discharge current is played damping action by damping resistance, and the design of damping resistance resistance is little, can decline by guiding discharge electric current
Subtract inconspicuous；The design of damping resistance resistance is big, and steady-state loss can be caused excessive；Reactor equally exists such problem.Pass
The parameter of system damping circuit to find optimal balance point between performance and loss, and design difficulty is higher；
3) damping reactor typically uses iron core reactor, and volume is big, and weight is big, is unfavorable for that complete set of equipments miniaturization is with light
Type.
For the problem in conventional damper loop, the application proposes a kind of novel lossless bypass loop, capital equipment bag
Include series capacitor bank C, damping resistance R, the second by-pass switch DL1, the first by-pass switch DL2, as it is shown in figure 1, one is used for
Power distribution network serial connection capacitor compensating device is lossless damping circuit, compensation device includes Capacitor banks C, lossless damping circuit bag
Including the damping branch road being connected and constituting loop with Capacitor banks C, this damping branch road includes interconnective damping resistance R and
Bypass switch DL2, lossless damping circuit also includes the second by-pass switch DL1 being connected and constituting loop with Capacitor banks C,
Second by-pass switch DL1 and damping branch circuit parallel connection；After first by-pass switch DL2 closes 0.02 second, the second by-pass switch DL1 closes
Closing, after the first by-pass switch DL2, Capacitor banks C is discharged by damping branch road, damping resistance R suppression maximum discharge current and frequency
Rate, after the second by-pass switch DL1 Guan Bi, Capacitor banks C is discharged by the second by-pass switch DL1.
After power distribution network serial connection capacitor compensating device controller sends bypass commands, the first by-pass switch DL2 Guan Bi, electricity
Container is discharged by resistor；DL2 closes a floodgate complete, and DL1 closes, and now capacitor is by conductive discharge, will not occur bigger
Discharge current, and DL1 bypass after, line current, all by DL1, is no longer flow through Capacitor banks C and damping resistance R, will not
Produce loss, solve the loss problem in routine bypass loop.
Owing to lossless damping circuit have employed two by-pass switches, the most also referred to as two-stage bypass loop.
First by-pass switch DL2 and the second by-pass switch DL1 is vacuum circuit breaker or vacuum contactor.
The design of damping resistance R mainly considers series capacitor discharge current amplitude and frequency limitation effect, plays resistance palpus
For the 10%～20% of the specified capacitive reactance of Capacitor banks C, preferably 15%.When by-pass switch closes a floodgate, Capacitor banks C will be through other
Way switch discharges, and always has distributed reactance and distributed resistance in discharge loop.The distributed reactance of every meter of wire be about 1.0～
2.5uH, if the resistance R in discharge loop is less than critical impedance value, then discharge process has cyclophysis.
During loop without out-damping series capacitor electric discharge time equivalent circuit as in figure 2 it is shown, discharge current as shown in Figure 3.
According to RLC loop characteristic, when series capacitor capacitance C is constant, increase damping resistance R, reduce loop and divide
Cloth reactance L, can make rectilinear oscillation electric current become aperiodic current.Due to loop inherent character, distributed reactance is difficult to change, can only
Install damping resistance additional.When installing damping resistance additional during series capacitor electric discharge equivalent circuit as shown in Figure 4, discharge current such as Fig. 5 institute
Show.
From Fig. 3 and Fig. 5 it can be seen that the effect installing damping resistance additional is obvious, maximum discharge current is reduced to initial value and obtains 1/
4, the persistent period is reduced to half period from few tens of cycles.
From Fig. 5 it can also be seen that the damping resistance effective time is shorter, it is only number ms.
On-the-spot circuit distributed reactance is difficult to accurately measure, and damping resistance is generally according to the specified capacitive reactance of series capacitor bank
10%～20% selects, and can obtain preferable current limitation effect.R's is the biggest, and current limitation effect is the best, but the damage that power frequency continued flow causes
Consume the biggest.
The selection of by-pass switch DL1, DL2, bears generally according to rated voltage, rated current, rated frequency, short circuit current
The routine techniques conditions such as ability select, without particular/special requirement.
As shown in Figure 6, damping resistance R current waveform is as shown in Figure 7 for Capacitor banks C current waveform.
From figure 7 it can be seen that lossless damping circuit work characteristics is as follows:
1) Capacitor banks C discharge current is divided into two stages, and the first stage is band damping electric discharge, and now discharge current is non-
Cycle rapid decay electric current, but current attenuation is to a certain value more than zero；Second stage is undamped electric discharge, due to Capacitor banks
Terminal voltage has been substantially reduced, although now discharge current is periodic discharging electric current, but amplitude is the lowest, will not be to switch and electric capacity
Device group works the mischief；
2) damping resistance is the most in short-term by electric current, the most there is not insertion loss problem.
Claims (6)
1., for the lossless damping circuit of power distribution network serial connection capacitor compensating device, described compensation device includes capacitor
Group, described lossless damping circuit includes the damping branch road being connected and constituting loop with described Capacitor banks, this damping branch road bag
Include interconnective damping resistance and the first by-pass switch, it is characterised in that described lossless damping circuit also includes with described
Capacitor banks connects and constitutes second by-pass switch in loop, described second by-pass switch and described damping branch circuit parallel connection；
After specifying time delay after first by-pass switch Guan Bi, the second by-pass switch Guan Bi, after the first by-pass switch, Capacitor banks passes through
Damping branch road electric discharge, described damping resistance suppression maximum discharge current and frequency, after the second by-pass switch Guan Bi, Capacitor banks leads to
Cross the second by-pass switch electric discharge.
One the most according to claim 1 is used for the lossless damping circuit of power distribution network serial connection capacitor compensating device, and it is special
Levying and be, described first by-pass switch and the second by-pass switch are vacuum circuit breaker.
One the most according to claim 1 is used for the lossless damping circuit of power distribution network serial connection capacitor compensating device, and it is special
Levying and be, described first by-pass switch and the second by-pass switch are vacuum contactor.
One the most according to claim 1 is used for the lossless damping circuit of power distribution network serial connection capacitor compensating device, and it is special
Levying and be, described damping resistance is: resistance is the resistance of the specified capacitive reactance of Capacitor banks 10%～20%.
One the most according to claim 4 is used for the lossless damping circuit of power distribution network serial connection capacitor compensating device, and it is special
Levying and be, described damping resistance is: resistance is the resistance of the specified capacitive reactance of Capacitor banks 15%.
One the most according to claim 1 is used for the lossless damping circuit of power distribution network serial connection capacitor compensating device, and it is special
Levying and be, described appointment time delay is 0.02 second.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610407016.3A CN106099881A (en) | 2016-06-12 | 2016-06-12 | For the lossless damping circuit of power distribution network serial connection capacitor compensating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610407016.3A CN106099881A (en) | 2016-06-12 | 2016-06-12 | For the lossless damping circuit of power distribution network serial connection capacitor compensating device |
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| Publication Number | Publication Date |
|---|---|
| CN106099881A true CN106099881A (en) | 2016-11-09 |
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ID=57227893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610407016.3A Pending CN106099881A (en) | 2016-06-12 | 2016-06-12 | For the lossless damping circuit of power distribution network serial connection capacitor compensating device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111756232A (en) * | 2019-03-27 | 2020-10-09 | 台达电子企业管理（上海）有限公司 | Power unit |
| US11217993B2 (en) | 2019-03-27 | 2022-01-04 | Delta Electronics (Shanghai) Co., Ltd | Conversion system with high voltage side and low voltage side |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101789602A (en) * | 2010-01-13 | 2010-07-28 | 中国电力科学研究院 | Dynamic simulation device of extra-high, ultrahigh voltage thyristor controlled series compensation device and test method thereof |
| CN101969203A (en) * | 2010-09-20 | 2011-02-09 | 中电普瑞科技有限公司 | Three-bypass-breaker serial ultra/extra-high voltage subsection series capacitor compensation device |
| CN201805235U (en) * | 2010-09-20 | 2011-04-20 | 中电普瑞科技有限公司 | Extra/ultra-high voltage series capacitor compensating device having current transfer branch circuit |
| CN104659769A (en) * | 2013-11-21 | 2015-05-27 | 中国电力科学研究院 | Ultra-high-voltage series compensation device |
-
2016
- 2016-06-12 CN CN201610407016.3A patent/CN106099881A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101789602A (en) * | 2010-01-13 | 2010-07-28 | 中国电力科学研究院 | Dynamic simulation device of extra-high, ultrahigh voltage thyristor controlled series compensation device and test method thereof |
| CN101969203A (en) * | 2010-09-20 | 2011-02-09 | 中电普瑞科技有限公司 | Three-bypass-breaker serial ultra/extra-high voltage subsection series capacitor compensation device |
| CN201805235U (en) * | 2010-09-20 | 2011-04-20 | 中电普瑞科技有限公司 | Extra/ultra-high voltage series capacitor compensating device having current transfer branch circuit |
| CN104659769A (en) * | 2013-11-21 | 2015-05-27 | 中国电力科学研究院 | Ultra-high-voltage series compensation device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111756232A (en) * | 2019-03-27 | 2020-10-09 | 台达电子企业管理（上海）有限公司 | Power unit |
| US11217993B2 (en) | 2019-03-27 | 2022-01-04 | Delta Electronics (Shanghai) Co., Ltd | Conversion system with high voltage side and low voltage side |
| US11394292B2 (en) | 2019-03-27 | 2022-07-19 | Delta Electronics (Shanghai) Co., Ltd | Power unit |
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Application publication date: 20161109 |