CN202076788U - Parallel-type multi-target short-circuit fault current limiter - Google Patents
Parallel-type multi-target short-circuit fault current limiter Download PDFInfo
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- CN202076788U CN202076788U CN2011201643166U CN201120164316U CN202076788U CN 202076788 U CN202076788 U CN 202076788U CN 2011201643166 U CN2011201643166 U CN 2011201643166U CN 201120164316 U CN201120164316 U CN 201120164316U CN 202076788 U CN202076788 U CN 202076788U
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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
- Y02E40/20—Active power filtering [APF]
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Abstract
The utility model relates to a parallel-type multi-target short-circuit fault current limiter and is characterized in that a compensation circuit is connected in parallel between a current-limiting resistor and a non-linear load through a switch; the compensation circuit comprises a high-capacity passive filter, a low-capacity active filter and a fundamental resonance branch; the high-capacity passive filter is connected in series with the fundamental resonance branch; and the active filter is connected in parallel with the fundamental resonance branch. When the system runs normally, the switch is closed and the current-limiting resistor is connected in series with the line, the hybrid-type compensation circuit compensates reactive power and harmonic waves. If the load side of the system is in a short-circuit state, the switch S is cut off and the current-limiting resistor Lfcl serves as a large-load series circuit to limit the fault current. The current limiter compensates the harmonic waves and reactive currents of the loads as well as reactive power loss due to series connection of the traditional limiting resistor. The parallel-type multi-target short-circuit fault current limiter reduces the capacity of the APF and the harmonic current and voltage levels of the system, and has good short-circuit current limiting levels.
Description
Technical field
The utility model relates to a kind of power equipment, particularly a kind of parallel connection type multiple target short circuit current fault current limiter.
Background technology
Along with increasing rapidly of China's power system load and constantly putting into operation of big capacity unit, the short circuit current level of electric power system increases day by day.Improve the harsher requirement that is brought in order to satisfy short circuit current, conventional way is to seal in the short circuit current limitation reactor in electrical network.In addition, power electronic technology is more prevalent in the electricity consumption of modern electric load.These Technics of Power Electronic Conversion equipment nearly all be unable to do without the application of rectifier.Thereby harmonic wave that the load of rectification class causes and idle problem have become the subject matter of electric power quality.
Summary of the invention
The utility model is the problem that can produce reactive loss at present short circuit current limitation reactor, a kind of parallel connection type multiple target short circuit current fault current limiter has been proposed, mixed active electric power filter and current limiting reactor are comprehensively used, the not only harmonic wave of compensating load and reactive current, and compensation series connection current limiting reactor brings reactive loss.
The technical solution of the utility model is: a kind of parallel connection type multiple target short circuit current fault current limiter, compensating circuit is connected between current limiting reactor and the nonlinear load by switch in parallel, compensating circuit comprises the active filter and the first-harmonic resonance branch road of jumbo passive filter, low capacity, jumbo passive filter is connected with the first-harmonic resonance branch road, and active filter is connected in parallel on the first-harmonic resonance branch road.
Described jumbo passive filter is composed in parallel by 5 times, 7 times and high pass LC filter circuit.
Described active filter supports the electric capacity parallel connection by full-control type power semiconductor device and direct current and constitutes.
Described first-harmonic resonance is propped up the route inductance capacitance and is formed capacity earth in the passive filter series connection first-harmonic resonance branch road, in parallel and first-harmonic resonance branch road electric capacity two ends behind the inductance series active power filter in the first-harmonic resonance branch road.
The beneficial effects of the utility model are: the utility model parallel connection type multiple target short circuit current fault current limiter, and the harmonic wave of compensating load and reactive current when coming into operation, and also compensation series connection current limiting reactor brings reactive loss.Reduce the capacity of APF and the harmonic current and the voltage content of system, and had good short circuit current limit levels.
Description of drawings
Fig. 1 is main circuit structure figure in the utility model parallel connection type multiple target short circuit current fault current limiter;
Fig. 2 is one phase equivalent circuit figure in the utility model parallel connection type multiple target short circuit current fault current limiter;
Fig. 3 is a single-phase fundamental isoboles in the utility model parallel connection type multiple target short circuit current fault current limiter;
Fig. 4 acts on equivalent circuit diagram separately for single phase poaer supply harmonic voltage in the utility model parallel connection type multiple target short circuit current fault current limiter;
Fig. 5 acts on one phase equivalent circuit figure separately for load harmonic current in the utility model parallel connection type multiple target short circuit current fault current limiter;
Fig. 6 is instruction current operator and DC voltage control link figure in the utility model parallel connection type multiple target short circuit current fault current limiter.
Embodiment
Traditional short trouble current limiting reactor inserts fast equivalent impedance when electric power system is short-circuited fault can limiting short-circuit current, but can cause the reactive loss under the normal condition, must add reactive-load compensation equipment in addition.The purpose of this utility model is designed a kind of parallel connection type multiple target short circuit current fault current limiter at this shortcoming exactly.
The main circuit structure of system as shown in Figure 1, Z
sBe power supply inside equiva lent impedance, current limiting reactor L
FclThe Vs of preceding series connection is a voltage source, and compensating circuit is by switch S and be connected in current limiting reactor L
FclAnd between the nonlinear load.Compensating circuit mainly is made of three parts: the active filter and the L of jumbo passive filter (comprising 5 times, 7 times and high pass), low capacity
1, C
1The first-harmonic resonance branch road that constitutes, jumbo passive filter is connected with the first-harmonic resonance branch road, and active filter is connected in parallel on the first-harmonic resonance branch road.The active filter main circuit is to support the capacitor C parallel connection by full-control type power semiconductor device IGBT and direct current to constitute.L
1, C
1Be used for shunting fundamental reactive current.Harmonic source is the three-phase bridge rectifier circuit of band resistance sense load.The APF equivalence is a controlled current source.When system normally moves, switch S closure, current limiting reactor L
FclConnect on the line compensating circuit compensating reactive power and harmonic wave.If system is short-circuited in load side, then switch S disconnects, current limiting reactor L
FclBe equivalent to a heavy load big circuit of connecting, fault current is restricted.
From main circuit diagram as can be seen the passive filter filtering the main harmonic wave of system, so APF only bears less harmonic voltage and harmonic current, so its capacity reduces greatly.By detecting the harmonic components of load current, active filter is controlled to be controlled current source i in the native system
APF
Be illustrated in figure 2 as one phase equivalent circuit, voltage source V s is decomposed into fundamental voltage component V
SfWith harmonic voltage component V
ShLoad current is decomposed into fundamental current component i
LfWith harmonic current components i
Lh, Z
sBe power supply inside equiva lent impedance; Lfcl is the short circuit current limitation reactor; L
F, C
FBe respectively the total inductance and the total capacitance of 5 times, 7 times monotonic filters and high pass filter; L
1, C
1Be respectively the inductance and the electric capacity of first-harmonic resonance branch road.
The active filter current i
APF=ki
Lh(1), circuit is decomposed into three parts, the equivalent electric circuit of power supply fundamental voltage and load fundamental current, the equivalent electric circuit of the equivalent electric circuit of supply harmonic voltage and load harmonic current according to principle of stacking
Be illustrated in figure 3 as the first-harmonic equivalent circuit diagram, because active filter output harmonic wave electric current only, so under power supply fundamental voltage and the effect of load fundamental current, be equivalent to open circuit; The first-harmonic resonance branch road is in resonance condition under first-harmonic, can regard short circuit as, and its voltage is zero.As can be seen, under first-harmonic, filter is equivalent to reactive-load compensator from circuit, plays the fixing idle effect of compensation.Current limiting reactor is equivalent to a linear reactance to be received in the circuit, only consumes idle.Electric power outputting current is a fundamental current.iSH=0
Supply harmonic voltage acts on equivalent electric circuit separately as shown in Figure 4, owing to only consider supply harmonic voltage, so i
APF=ki
Lh=0.With L
1, C
1Regard Z1 as.L
F, C
FRegard ZF as, system harmonics current i SH expression formula is
The adding of (2) hence one can see that active filter and first-harmonic resonance branch road quite with in system side adds an impedance Z 1, thereby plays the effect that system harmonics voltage produces harmonic current that suppresses, and has also avoided passive filter and electrical network generation resonance simultaneously.
The load harmonic current acts on equivalent electric circuit separately as shown in Figure 5,
Generally, supply harmonic voltage V
ShVery little, approach zero.Because passive filter is tuning accurately, then can ignore ZF.The harmonic wave output current i of control active filter
APF=i
LhEven k is that 1. (5) can be reduced to iSH
0.In sum, the passive filter branch road is gone in the harmonic wave multithread of load and current limiting reactor generation as can be known, thereby reduces the capacity of Active Power Filter-APF greatly.Simultaneously, passive filter has born all electrical network fundamental voltages.The first-harmonic resonance branch road that increases newly can be shunted all fundamental reactive currents.And Active Power Filter-APF only bears on the current limiting reactor and the harmonious ripple electric current of harmonic voltage, and the filtering performance of whole system improves.
The electric current of mixing compensation system control filters compensation is the harmonic current of load, harmonic current detects and adopts the p-q operation method to ask for the reference harmonic electric current, the DC side of active filter is taked vertical compression control, makes its direct current survey capacitance voltage and maintains in the permission fluctuation range.The IGBT control unit is realized real-time tracking to the reference harmonic electric current with the chain rate that stagnates than mode.
Active Power Filter-APF of the present invention needs compensation harmonic and idle, so the offset current component comprises harmonic wave and idle two parts, the p-q detection method based on instantaneous reactive power theory is adopted in the detection of offset current.Harmonic wave and reactive current that system's normal operation period, APF not only want the filtering load to be brought also need be eliminated caused voltage landing of current limiting reactor L and reactive loss, so should be with the zero setting of q passage in traditional idle detection loop.Detect principle instruction current computing and DC voltage control link figure as shown in Figure 6.Wherein
Ea, Eb, Ec and ia, ib, ic are respectively system voltage and load detecting electric current, and active power and reactive power p and q that this method is calculated whole system according to definition obtain DC component through low pass filter
, get fundamental active current after the inverse transformation, detect current subtraction with system then and obtain the comprehensive of system harmonics and reactive current.
Simultaneously, Fig. 6 frame of broken lines is depicted as the control of APF vertical compression side.Edr is the set-point of Ed, and Edc is the value of feedback of Ed, and both differences are adjusted signal behind pi regulator, and stack obtains the compensating current signal of Active Power Filter-APF with system harmonics and reactive current then.
This shows the harmonic wave that the traditional APF of simple use can not the full remuneration system and idle.The use of the design's mixed electric power filter has improved this situation greatly.Mixed active electric power filter not only makes the harmonic wave of system and reactive compensation system effect significantly improve, and the adding of first-harmonic resonance branch road branch road also greatly reduces the capacity of APF, has given full play to active and passive filter characteristics separately.All are in the scope that the design mentions, that makes similar modification or replacement all belongs to the design's protection range.
Claims (4)
1. parallel connection type multiple target short circuit current fault current limiter, it is characterized in that, compensating circuit is connected between current limiting reactor and the nonlinear load by switch in parallel, compensating circuit comprises the active filter and the first-harmonic resonance branch road of jumbo passive filter, low capacity, jumbo passive filter is connected with the first-harmonic resonance branch road, and active filter is connected in parallel on the first-harmonic resonance branch road.
2. according to the described parallel connection type multiple target of claim 1 short circuit current fault current limiter, it is characterized in that described jumbo passive filter is composed in parallel by 5 times, 7 times and high pass LC filter circuit.
3. according to the described parallel connection type multiple target of claim 1 short circuit current fault current limiter, it is characterized in that described active filter supports the electric capacity parallel connection by full-control type power semiconductor device and direct current and constitutes.
4. according to the described parallel connection type multiple target of claim 1 short circuit current fault current limiter, it is characterized in that, described first-harmonic resonance is propped up the route inductance capacitance and is formed, capacity earth in the passive filter series connection first-harmonic resonance branch road, in parallel and first-harmonic resonance branch road electric capacity two ends behind the inductance series active power filter in the first-harmonic resonance branch road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201643166U CN202076788U (en) | 2011-05-23 | 2011-05-23 | Parallel-type multi-target short-circuit fault current limiter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201643166U CN202076788U (en) | 2011-05-23 | 2011-05-23 | Parallel-type multi-target short-circuit fault current limiter |
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| Publication Number | Publication Date |
|---|---|
| CN202076788U true CN202076788U (en) | 2011-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201643166U Expired - Fee Related CN202076788U (en) | 2011-05-23 | 2011-05-23 | Parallel-type multi-target short-circuit fault current limiter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102208803A (en) * | 2011-06-03 | 2011-10-05 | 上海理工大学 | Parallel-connection type current limiter of multi-objective short-circuit current faults |
| CN112054498A (en) * | 2020-09-24 | 2020-12-08 | 云南电网有限责任公司电力科学研究院 | Current-limiting protection method and device of ground fault full-compensation system |
-
2011
- 2011-05-23 CN CN2011201643166U patent/CN202076788U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102208803A (en) * | 2011-06-03 | 2011-10-05 | 上海理工大学 | Parallel-connection type current limiter of multi-objective short-circuit current faults |
| CN112054498A (en) * | 2020-09-24 | 2020-12-08 | 云南电网有限责任公司电力科学研究院 | Current-limiting protection method and device of ground fault full-compensation system |
| CN112054498B (en) * | 2020-09-24 | 2022-09-27 | 云南电网有限责任公司电力科学研究院 | Current-limiting protection method and device of ground fault full-compensation system |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111214 Termination date: 20120523 |