CN106972471A - Multifunctional short circuit demand limiter - Google Patents
Multifunctional short circuit demand limiter Download PDFInfo
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- CN106972471A CN106972471A CN201710288705.1A CN201710288705A CN106972471A CN 106972471 A CN106972471 A CN 106972471A CN 201710288705 A CN201710288705 A CN 201710288705A CN 106972471 A CN106972471 A CN 106972471A
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- phase
- power network
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- transverter
- short 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The invention discloses a kind of Multifunctional short circuit demand limiter, including transformer, filter circuit, three-phase transverter, two-way DC/DC current transformers and Ultracapacitor Energy Storage.The AC and DC side of three-phase transverter are connected with filter circuit and two-way DC/DC current transformers respectively.When short trouble occurs for power network, Ultracapacitor Energy Storage can realize the suppression to short circuit current flow by three-phase transverter to the certain voltage with system power source voltage same-phase of power network injection；Under power network non-faulting running situation, Ultracapacitor Energy Storage is injected or absorbed amplitude and the adjustable voltage of phase by three-phase transverter to power network can stablize line voltage, the trend of regulating system and solve electric energy unbalanced supply-demand etc..The present invention realizes a tractor serves several purposes, improves the utilization rate of equipment, can effective guarantee power network safe and reliable operation.
Description
Technical field
It is when short trouble occurs in electric line specifically the present invention relates to transmission ＆ distribution electro-technical field in power network
The Multifunctional short circuit demand limiter effectively suppressed to short-circuit impact high current.
Background technology
With the fast development of power network, unit and station capacity, city operating and industrial load and its density
Continue to increase, and the depth interconnection between the extensive grid-connected and at different levels power network of all kinds of distributed power sources, the short circuit electricity in power network
Flow horizontal increases increasingly, so as to bring very big limitation to the performance of multi-line power transmission ability and the Effec-tive Function of system.
Especially, the screening of even more than breaker has gradually been approached in its regional short circuit current level of some of power network
Disconnected capacity, and with significant ascendant trend, so as to constitute serious threat to the safe and stable operation of power network.
In order to ensure the safety of relevant device in power network, the rupturing capacity of breaker is reduced, promotes the lasting health of power network
Development, urgently needs to deploy effective limitation to the short circuit current flow in power network.Traditional current-limiting mode such as looped network off-the-line, mother
Line segmentation and DC online etc. are while limiting short-circuit current to some extent, and the also operation and management to power network is caused not
Small negative effect, and short circuit current limiter is attracted wide attention and furtherd investigate by unique advantage.
In recent years, it is more popular in short circuit current limiter research field to have superconductive current limiter, PTC thermistor type
The driving current limiter of current limiter, arc, liquid metal type current limiter, electronic power switch type current limiter and compound current limiter
Deng.
While the research of all kinds of novel short circuit demand limiters and result of design are constantly obtained, related ends are basic
Theory stage is rested on, large-scale utilization is not obtained.Main reason is that currently proposed short circuit current limiter
The effectiveness of itself is just simply often played when short trouble occurs in power network, its utilization ratio is not high.
In addition, when power network is normally run, short circuit current limiter can be also produced compared with lossy.So as to a certain extent
Limit the application and popularization of such short circuit current limiter in practice.
The content of the invention
It is an object of the invention to provide a kind of Multifunctional short circuit demand limiter, to solve existing short circuit current limiter
Function is excessively single and is unfavorable for the problem promoted the use of.
Therefore, being changed the invention provides a kind of Multifunctional short circuit demand limiter, including transformer, filter circuit, three-phase
Device, two-way DC/DC current transformers and Ultracapacitor Energy Storage are flowed, wherein, the primary coil of the transformer is electrically connected to
Power network three-phase line；The filter circuit be located at the transformer secondary coil and the three-phase transverter AC it
Between, for filtering out harmonic wave；The AC of the three-phase transverter is connected with the filter circuit, the direct current of the three-phase transverter
Side is by two identical electric capacity C1 and C2 series connection come burning voltage, and the three-phase transverter is voltage source converter,
Full-controlled switch T1, T2, T3, T4, T5, T6 of its each mutually upper and lower bridge arm use IGBT, each IGBT afterflow two in parallel
Pole pipe；And the two-way DC/DC current transformers are as between Ultracapacitor Energy Storage and the three-phase Converter DC-side
Interface, for controlling flow direction of the electric energy between power network and Ultracapacitor Energy Storage.
Further, the tie point between above-mentioned electric capacity C1 and the electric capacity C2 constitutes the three-phase Converter DC-side mother
The midpoint of line voltage, the midpoint is connected with the three-phase common port of the transformer secondary coil.
Further, above-mentioned two-way DC/DC current transformers include full-controlled switch T7 and full-controlled switch T8.
Further, above-mentioned full-controlled switch T7, T8 are managed using MOSFET, the afterflow two in parallel of each MOSFET pipes
Pole pipe.
Further, the array structure that above-mentioned Ultracapacitor Energy Storage is formed after ultracapacitor monomer connection in series-parallel
Into.
Further, above-mentioned filter circuit is collectively constituted by LCL filter circuits and LC filter circuits.
Further, above-mentioned Multifunctional short circuit demand limiter also includes host computer, and the host computer is according to operation of power networks
State is controlled to the three-phase transverter and the two-way DC/DC current transformers.
Further, above-mentioned host computer becomes according to operation of power networks state to the three-phase transverter and the two-way DC/DC
Stream device be controlled including：When power network is in low power consumption, the three-phase transverter is controlled to work in rectification state and described
Two-way DC/DC current transformers are worked under Buck circuit-modes, utilize the Ultracapacitor Energy Storage charging energy-storing；Work as power network
During generation short trouble, the control three-phase transverter works in inverter mode and the two-way DC/DC current transformers are worked in
Under Boost circuit pattern, to power network inject one with system power source voltage same-phase and amplitude and system power source voltage amplitude into
The voltage of ratio, wherein, the value of the ratio is between 0 to 1.
Further, above-mentioned host computer becomes according to operation of power networks state to the three-phase transverter and the two-way DC/DC
Stream device be controlled including：When power network is in peak of power consumption, the three-phase transverter is controlled to work in inverter mode and described
Two-way DC/DC current transformers are worked under Boost circuit pattern, and energy is released using Ultracapacitor Energy Storage electric discharge；Work as electricity
When net voltage is fluctuated, the control three-phase transverter works in inverter mode and the two-way DC/DC current transformers are worked in
Under Boost circuit pattern, an amplitude and phase controllable offset voltage are injected to power network；And when power network is in normal fortune
During row state, the two-way DC/DC current transformers are controlled to cut off the energy between the power network and the Ultracapacitor Energy Storage
Amount flowing.
Further, above-mentioned host computer becomes according to operation of power networks state to the three-phase transverter and the two-way DC/DC
Stream device be controlled including：When reactive power needs adjustment, the three-phase transverter is controlled to work in inverter mode and described
Two-way DC/DC current transformers are worked under Boost circuit pattern, and the controllable compensation electricity of an amplitude and phase is sealed in power network
Pressure.
It can implement effective to short circuit current flow when short trouble occurs for power network according to the short circuit current limiter of the present invention
Suppression, line voltage, regulating system trend can be stablized in the operation of power network non-faulting and electric energy unbalanced supply-demand etc. is solved
Problem, realizes the variation of short circuit current limiter function, and the utilization rate of equipment greatly improved, and can be protected under different operating modes
Hinder the safe and reliable and stable operation of power network, so as to possess higher application and promotional value.
In addition to objects, features and advantages described above, the present invention also has other objects, features and advantages.
Below with reference to figure, the present invention is further detailed explanation.
Brief description of the drawings
The Figure of description for constituting the part of the application is used for providing a further understanding of the present invention, and of the invention shows
Meaning property embodiment and its illustrate be used for explain the present invention, do not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the schematic diagram of the main circuit of Multifunctional short circuit demand limiter according to an embodiment of the invention；And
Fig. 2 is the schematic internal view of Ultracapacitor Energy Storage in the present invention.
Description of reference numerals
1st, system power supply；2nd, source reactance；
3rd, breaker；4th, transformer；
5th, load；6th, filter circuit；
7th, three-phase transverter；8th, two-way DC/DC current transformers；
9th, Ultracapacitor Energy Storage.
Embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combination.Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
As shown in figure 1, this Multifunctional short circuit demand limiter include transformer 4, it is filter circuit 6, three-phase transverter 7, double
To DC/DC current transformers 8 and Ultracapacitor Energy Storage 9.Wherein, three-phase transverter 7 AC connection filter circuit 6 it
It is connected again by transformer 4 with power network afterwards, the DC side of three-phase transverter 7 passes through two-way DC/DC current transformers 8 and ultracapacitor
Energy storage device 9 is connected.
The three-phase transverter 7 of the present invention is preferred to use voltage source converter, the full-controlled switch of the upper and lower bridge arms of Qi Gexiang
T1、T2、T3、T4、T5、T6Use IGBT, each IGBT fly-wheel diode in parallel.Three-phase transverter 7 is filtered by filter circuit 6
The voltage source that an amplitude and phase can be controlled flexibly can be equivalent to after ripple.The DC side of three-phase transverter 7 passes through two
Identical electric capacity C1And C2Series connection comes voltage-stabilized power supply, electric capacity C1With electric capacity C2Between tie point constitute three-phase transverter 7 it is straight
The midpoint of side bus voltage is flowed, the point is connected with the three-phase common port of the secondary coil of transformer 4.The structure is set to zero sequence
Electric current provides passage, so as to realize the independent control to each phase electrical quantity in the course of the work so that the present invention can
Applied to symmetrical short-circuit, it is also applied in the case of unsymmetrical short-circuit.It is connected again with power network by transformer 4, on the one hand in three-phase
Effective electrical equipment isolation, on the other hand reduces the voltage level of the DC side of three-phase transverter 7 between transverter 7 and circuit,
So as to improve the safety and reliability of the present invention in the course of the work.
Filter circuit 6 be located at transformer 4 secondary coil and three-phase transverter 7 AC between, it play filter out it is humorous
Ripple is to improve the effect of voltage waveform.Filter circuit 6 is collectively constituted by LCL filter circuits and LC filter circuits, wherein, inductance
La1, inductance La2, resistance Ra1, electric capacity Ca2, inductance Lb1, inductance Lb2, resistance Rb1, electric capacity Cb2With inductance Lc1, inductance Lc2, resistance
Rc1, electric capacity Cc2The LCL filter circuits of A phases, B phases and C phases are constituted successively；Inductance La3, electric capacity Ca1, inductance Lb3, electric capacity Cb1With
Inductance Lc3, electric capacity Cc1The LC filter circuits of A phases, B phases and C phases are constituted successively.
As the interface between Ultracapacitor Energy Storage 9 and the dc bus side of three-phase transverter 7, two-way DC/DC becomes
Stream device 8 carries out the essential elements of two-way flow for completion energy between power network and Ultracapacitor Energy Storage 9.Two-way DC/
DC current transformers 8 are the full-controlled switch T in semi-bridge type topological structure, its main circuit7、T8MOSFET is used, each MOSFET is simultaneously
Join a fly-wheel diode.The dc bus of the high-pressure side connection three-phase transverter 7 of two-way DC/DC current transformers 8, low-pressure side connection
Ultracapacitor Energy Storage 9.
To switch T in the present invention7、T8Using independent PWM control modes, when needing decompression, T is switched7Work in PWM side
Under formula, and switch T8All the time state is off, and is utilized and T8Associated diode carries out afterflow, in this case, circuit work
Make in Buck patterns, electric current is flowed by high side to low side；When needing boosting, T is switched8Work under PWM mode, and
Switch T7All the time state is off, and is utilized and T7Associated diode carries out afterflow, in this case, circuit is operated in
In Boost patterns, electric current is flowed by the lateral high-pressure side of voltage.
As shown in Figure 2, Ultracapacitor Energy Storage 9 forms battle array after ultracapacitor monomer connection in series-parallel in the present invention
Row are constituted, and the form of array is that ultracapacitor monomer number and parallel branch number can be according to different applications in series arm
Occasion carries out specific design.Wherein, ultracapacitor monomer is produced using Nippon Chemicon
2.5V600F72S4P18033F type ultracapacitor group.
In actual control, to charging modes and invariable power of the Ultracapacitor Energy Storage 9 using first constant current constant pressure again
Discharge mode, in charging process, Ultracapacitor Energy Storage 9 is charged using the control to two-way DC/DC converters 8
To the voltage of setting, in discharge process, the DC side of three-phase transverter 7 is kept by the control to two-way DC/DC current transformers 8
Busbar voltage it is constant so that three-phase transverter 7 can to power network delivered constant active power.
The present invention sets up a host computer to enter three-phase transverter 7 and two-way DC/DC current transformers 8 in specific works
Row control, by the analysis to operation of power networks state-detection result, host computer determines that three-phase transverter 7 and two-way DC/DC become again
How stream device 8 works.When short trouble occurs for power network, testing result is transferred to after host computer, and host computer is allowed by instruction
Three-phase transverter 7 works in inverter mode, and two-way DC/DC current transformers 8 is worked under Boost circuit pattern, using super
Energy-storing device with capacitor 9 release and can discharge, now just can phase power network injection one and system power source voltage same-phase and width
The voltage of value and system power source voltage voltage magnitude proportional (ratio is between 0 and 1), so as to effectively reduce short circuit
Electric current.
When line voltage is fluctuated, i.e., there is rising or falling in short-term in voltage, and this is can to inject one to power network
Amplitude and phase controllable offset voltage, so as to play a part of stable line voltage.Sealed in also with to power network
The mode of one amplitude and phase controllable offset voltage, it is possible to achieve active power and idle work(between the present invention and power network
The flexible exchange of rate, so as to reach the purpose of regulating system trend.
When power network is in low power consumption, is sent and instructed by host computer, three-phase transverter 7 is worked in rectification state,
Allow two-way DC/DC current transformers 8 to work under Buck circuit-modes simultaneously, utilize the charging energy-storing of Ultracapacitor Energy Storage 9；When
When power network is in peak of power consumption, under the instruction of host computer, three-phase transverter 7 is set to work in inverter mode, while allowing two-way DC/
DC current transformers 8 are worked under Boost circuit pattern, and energy is released using the electric discharge of Ultracapacitor Energy Storage 9.So not only improve solution
Certainly system unbalanced supply-demand problem, it helps improve the operational efficiency of power network.
In addition, when power network is under normal operating condition, not occurring energy between power network and Ultracapacitor Energy Storage 9
Flowing, the present invention implements no-voltage injection to power network, and influence is produced from without the normal operation on system.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (10)
1. a kind of Multifunctional short circuit demand limiter, it is characterised in that including transformer (4), filter circuit (6), the three-phase change of current
Device (7), two-way DC/DC current transformers (8) and Ultracapacitor Energy Storage (9), wherein,
The primary coil of the transformer (4) is electrically connected to power network three-phase line；
The filter circuit (6) be located at the transformer (4) secondary coil and the three-phase transverter (7) AC it
Between, for filtering out harmonic wave；
The AC of the three-phase transverter (7) is connected with the filter circuit (6), the DC side of the three-phase transverter (7)
Pass through two identical electric capacity C1And C2Series connection carrys out burning voltage, and the three-phase transverter (7) is voltage source converter,
The full-controlled switch T of its each mutually upper and lower bridge arm1、T2、T3、T4、T5、T6Use IGBT, each IGBT poles of afterflow two in parallel
Pipe；And
The two-way DC/DC current transformers (8) are used as Ultracapacitor Energy Storage (9) and the three-phase transverter (7) DC side
Between interface, for controlling flow direction of the electric energy between power network and Ultracapacitor Energy Storage (9).
2. Multifunctional short circuit demand limiter according to claim 1, it is characterised in that the electric capacity C1With the electric capacity
C2Between tie point constitute the midpoint of three-phase transverter (7) DC side busbar voltage, the midpoint and the transformer (4)
The three-phase common port of secondary coil is connected.
3. Multifunctional short circuit demand limiter according to claim 1, it is characterised in that the two-way DC/DC current transformers
Including full-controlled switch T7With full-controlled switch T8。
4. Multifunctional short circuit demand limiter according to claim 1, it is characterised in that the full-controlled switch T7、T8
Managed using MOSFET, each MOSFET pipes fly-wheel diode in parallel.
5. Multifunctional short circuit demand limiter according to claim 1, it is characterised in that the ultracapacitor energy storage dress
The array that (9) formed after ultracapacitor monomer connection in series-parallel is put to constitute.
6. Multifunctional short circuit demand limiter according to claim 1, it is characterised in that the filter circuit is filtered by LCL
Wave circuit and LC filter circuits are collectively constituted.
7. Multifunctional short circuit demand limiter according to claim 1, it is characterised in that also including host computer, it is described on
Position machine is controlled according to operation of power networks state to the three-phase transverter (7) and the two-way DC/DC current transformers (8).
8. Multifunctional short circuit demand limiter according to claim 7, it is characterised in that the host computer is transported according to power network
Row state the three-phase transverter (7) and the two-way DC/DC current transformers (8) are controlled including：
When power network is in low power consumption, the three-phase transverter (7) is controlled to work in rectification state and the two-way DC/DC changes
Stream device (8) is worked under Buck circuit-modes, utilizes the Ultracapacitor Energy Storage (9) charging energy-storing；
When short trouble occurs for power network, the three-phase transverter (7) is controlled to work in inverter mode and the two-way DC/DC changes
Stream device (8) is worked under Boost circuit pattern, and one and system power source voltage same-phase and amplitude and system electricity are injected to power network
The proportional voltage of source voltage magnitude, wherein, the value of the ratio is between 0 to 1.
9. Multifunctional short circuit demand limiter according to claim 8, it is characterised in that the host computer is transported according to power network
Row state the three-phase transverter (7) and the two-way DC/DC current transformers (8) are controlled including：
When power network is in peak of power consumption, the three-phase transverter (7) is controlled to work in inverter mode and the two-way DC/DC changes
Stream device (8) is worked under Boost circuit pattern, and energy is released using the Ultracapacitor Energy Storage (9) electric discharge；
When line voltage is fluctuated, the three-phase transverter (7) is controlled to work in inverter mode and the two-way DC/DC changes
Stream device (8) is worked under Boost circuit pattern, and an amplitude and phase controllable offset voltage are injected to power network；And
When power network is in normal operating condition, the two-way DC/DC current transformers (8) are controlled to cut off the power network and described super
Energy flow between energy-storing device with capacitor (9).
10. Multifunctional short circuit demand limiter according to claim 8, it is characterised in that the host computer is according to power network
Running status the three-phase transverter (7) and the two-way DC/DC current transformers (8) are controlled including：
When reactive power needs adjustment, the three-phase transverter (7) is controlled to work in inverter mode and the two-way DC/DC changes
Stream device (8) is worked under Boost circuit pattern, and an amplitude and phase controllable offset voltage are sealed in power network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710288705.1A CN106972471A (en) | 2017-04-27 | 2017-04-27 | Multifunctional short circuit demand limiter |
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| CN201710288705.1A CN106972471A (en) | 2017-04-27 | 2017-04-27 | Multifunctional short circuit demand limiter |
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ID=59333649
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111742476A (en) * | 2018-02-19 | 2020-10-02 | 西门子股份公司 | Short-circuit resistant converter with direct current control |
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Application publication date: 20170721 |