CN105372521A - Simulation and detection method based on line zero-sequence current in physical model of power distribution network - Google Patents
Simulation and detection method based on line zero-sequence current in physical model of power distribution network Download PDFInfo
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- CN105372521A CN105372521A CN201510712909.4A CN201510712909A CN105372521A CN 105372521 A CN105372521 A CN 105372521A CN 201510712909 A CN201510712909 A CN 201510712909A CN 105372521 A CN105372521 A CN 105372521A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a simulation and detection method based on the line zero-sequence current in a physical model of the power distribution network, and belongs to the field of power distribution automation of the power system. A present detection method has the problem that large errors tend to occur when the practical load impedance is inconsistent with the capacity of a zero-sequence current transformer. According to the method provided by the invention, a three-phase line and an auxiliary winding are wound around the same annular iron core, and the secondary current value and the measuring precision of a zero-sequence current transformer are greatly improved in a magnetic balance principle.
Description
Technical field
The invention belongs to electric power system power distribution automatic field, more specifically, relate to a kind of based on the circuit zero sequence current analog in power distribution network physical model and detection method.
Background technology
In practical power systems, power distribution network zero sequence current mutual inductor is a kind of line fault current monitor.Generally only have an iron core and Secondary Winding; during use; by three-phase conducting wire iron core fenestra through mutual inductor; utilize zero sequence current mutual inductor to detect three-phase current phasor and; i.e. zero-sequence current Io; IA+IB+IC=Io, secondary is connected to special protective relaying device by lead-in wire, then receives telltale or warning system by the output terminal of protective relaying device.When three-phase load complete equipilibrium, in primary circuit, three-phase current is in a basic balance, and its resultant flux that produces also is bordering on zero (Io=0); As the three-phase load unbalance that circuit connects, then Io=IN, zero-sequence current is now out-of-balance current IN; When a certain earth fault of generation mutually, certainly leading to a single-phase earth fault current Id, the zero-sequence current Io=IN+Id now detected, is the vector of three phase unbalance current and single-phase-to-ground current.Generation current is not responded in the Secondary Winding of mutual inductor; when there is the faults such as single-phase earthing in a circuit; produce out-of-balance current (i.e. zero-sequence current) in primary circuit, the small area analysis responding to generation in Secondary Winding makes protective relaying device action, sends signal.
The general all selection of small no-load voltage ratios of the application of zero sequence current mutual inductor, conventional as: 50/5; 75/5; 100/5; 150/5; 200/5; 20/1; 50/1; 100/1; 150/1; 200/1, because when only having a generation earth fault, zero sequence current mutual inductor just has output. just make protection act when people can not allow ground current very large.But due to one time, winding is power cable, only has a circle, like this, and 50/5; The specified number of turn of secondary of the zero sequence current mutual inductor of 10/1, only 10 circles, so the zero sequence current mutual inductor part throttle characteristics of 50/5,10/1 is poor, larger error will be there will be when the capacity of actual loading impedance and zero sequence current mutual inductor is inconsistent, and also can strengthen lower than rated current time error, so when allowing as far as possible first with larger change.
Dynamic simulation experiment of electric power system room is the physical model set up according to the principle of similitude, the relation simulating ratio is there is in model current with prototype electric current, due in prototype system, when isolated neutral or the zero-sequence current that produces when the one-phase earthing failure in electric distribution network of grounding through arc very little, if adopt traditional punching zero sequence current mutual inductor to measure in dynamic model experiment room, fault current only only has a few mA or less, even adopt 50/5 of minimum no-load voltage ratio, the zero sequence current mutual inductor of 10/1, also protective relaying device and fault wave recording device cannot be started, the research of system for distribution network of power dynamic analog test cannot be carried out.
Summary of the invention
For problems of the prior art, the application provides a kind of based on the circuit zero sequence current analog in power distribution network physical model and detection method, wherein by its key component as the concrete structure of iron core and coil etc. and set-up mode thereof are studied and are designed, improve secondary current value and the measuring accuracy of zero sequence current mutual inductor, be thus particularly useful for the application scenario of distribution network failure current detecting.
For achieving the above object; according to one aspect of the present invention, provide a kind of based on the circuit zero sequence current analog in power distribution network physical model and detection method, power distribution network comprises protective relaying device, fault wave recording device; it is characterized in that, the method comprises the following steps:
(1) infinitely great power supply and substation transformer model is set up, make described substation transformer neutral point have earth-free, through grounding through arc, resistance grounded three kinds of earthing modes, wherein said neutral by arc extinction coil grounding has under-compensation, over compensation operation mode;
(2) set up overhead transmission line or model for cable line, and on every bar circuit preset failure point, line end increase all kinds simulation load;
(3) overhead transmission line of the described substation transformer in described step (1) and acquisition in described step (2) or model for cable line and load model networking is utilized to build 10kV or 35kV electricity distribution network model;
(4) to obtain in the described step (3) be overhead transmission line model in described electricity distribution network model, three-phase serial connection installs magnetic balanced method Wound-rotor type zero sequence current mutual inductor additional on model for cable line head end; the square winding of paying of described Wound-rotor type zero sequence current mutual inductor succeeds electrical protective device and fault wave recording device, completes 10kV or the 35kV electricity distribution network model containing circuit zero sequence current detecting thus.
Preferably, described step (2) comprises following sub-step:
(2-1) parameter of described overhead transmission line or described model for cable line calculates, according to each transmission line of electricity type in prototype distribution network system, calculate prototype line parameter circuit value, according to prototype system and power analog ratio, current analog ratio, voltage analog ratio, the impedance simulation ratio of model system, calculate the various line parameter circuit values of model system, various load parameter;
(2-2) overhead transmission line model is set up according to prototype system;
(2-3) model for cable line is set up according to prototype system;
(2-4) various load model is set up according to prototype system;
(2-5) bus, line switching model is set up according to prototype system;
(2-6) access fault simulation unit is needed according to experimental study.
According to another aspect of the present invention, provide a kind of based on the circuit zero sequence current analog in power distribution network physical model and detection method, described power distribution network comprises protective relaying device, fault wave recording device and Wound-rotor type zero sequence current mutual inductor, and described method comprises step (1) and sets up 10kV or 35kV electricity distribution network model; It is characterized in that, the square winding of paying that the method also comprises step (2) described Wound-rotor type zero sequence current mutual inductor succeeds electrical protective device and fault wave recording device.
In general, according to above-mentioned technical conceive of the present invention compared with prior art, following technological merit is mainly possessed:
1, the present invention realizes the various operating condition of power distribution network by changing the various earthing mode of analogue transformer neutral point, by simulation than calculating, ensure the positive sequence of model overhead transmission line, cable line, negative phase-sequence and zero sequence impedance and capacitive reactance parameter consistent with the systematic parameter of prototype circuit, also well can simulate prototype circuit operational factor simultaneously, zero-sequence current is had to produce when singlephase earth fault, for dynamic test protective relaying device provides test source;
2, the inventive method is considered when isolated neutral or the very little feature of the zero-sequence current that produces when the one-phase earthing failure in electric distribution network of grounding through arc, adopt magnetic balanced method Wound-rotor type zero sequence current mutual inductor, by three-phase line and pair side's winding around on same annular core, secondary current value and the measuring accuracy of zero sequence current mutual inductor is substantially increased by magnetic balance principle, constructed model can reflect the various operating condition of various circuit comprehensively truly, solves small current neutral grounding system dynamic simulation experiment produced problem well.
Accompanying drawing explanation
Fig. 1 is 10kV power distribution network dynamic model experiment wiring diagram of the present invention;
Fig. 2 is Distributed power net overhead transmission line of the present invention or model for cable line;
Fig. 3 is the wiring diagram of zero sequence current mutual inductor of the present invention in overhead transmission line or model for cable line;
Fig. 4 is the wiring diagram of zero sequence current mutual inductor of the present invention at infinitely great power source model neutral point place.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In addition, if below in described each embodiment of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
The object of the invention is to overcome above-mentioned various model not enough, provide a kind of based on the circuit zero sequence current analog in power distribution network physical model and detection method, the method is in strict accordance with the requirement Modling model of power industry standard, adopt modern control mode, the opertaing device characteristic of simulation prototype system, makes model system more truly reflect prototype system electric parameters variation characteristic.
First according to the simulation ratio of principle of similitude Confirming model system with prototype system, set up substation transformer model, make analog ligand piezoelectric transformer neutral point have three kinds of earthing modes namely: be earth-free, sell arc coil (under-compensation, over-compensation) ground connection, resistance grounded.As shown in 10kV line right end portion in Fig. 1, set up various overhead transmission line or model for cable line, and on every bar circuit preset failure point, line end increase all kinds simulation load.
Secondly utilize the substation transformer model set up and overhead transmission line or model for cable line and load model networking to build 10kV low-voltage distribution pessimistic concurrency control, in this 10kV low-voltage distribution pessimistic concurrency control, the accurate analog parameter of the element such as substation transformer, various transmission line of electricity and arc suppression coil is all known.
Finally on simulation overhead transmission line, dummycable circuit head end, three-phase serial connection installs magnetic balanced method Wound-rotor type zero sequence current mutual inductor additional, and the square winding of paying of Wound-rotor type zero sequence current mutual inductor is succeeded electrical protective device and fault wave recording device and completed 10kV or 35kV electricity distribution network model containing circuit zero sequence current detecting thus.
Provided by the invention a kind of based on the circuit zero sequence current analog in power distribution network physical model and detection method, its concrete building process is:
1st step, as shown in 10kV line left end portion in Fig. 1, sets up substation transformer model, wherein transformer 24T neutral point be designed to earth-free, through grounding through arc, resistance grounded three kinds of earthing modes.
2nd step, as shown in 10kV line right end portion in Fig. 1, set up various circuit model, and at each circuit access fault simulation unit and fictitious load, what make each circuit carries out various short circuit experiment, mode of the setting up mode as shown in Figure 2 of various circuit model is set up, and each parameter of wherein circuit modeling comprises: Z1 is the positive sequence impedance of analog line; Zn is the neutral wire impedance of analog line; C1 is the positive sequence electric capacity of analog line; Cn is the middle line capacitance of analog line.
The parameter of the 2.1st step simulation overhead transmission line or cable line calculates, according to each transmission line of electricity type in prototype distribution network system, calculate prototype line parameter circuit value, according to the various various line parameter circuit values of simulating than calculate model system of prototype system with model system.
2.2nd step sets up overhead transmission line model, comprises the wiring of π type and joint use.
2.3rd step sets up model for cable line, comprises π type connection circuitry.
2.4th step sets up various load model, comprises the various operating modes of simulation rotary load, simulation static load and different size.
2.5th step sets up bus, line switching model.
2.6th step, at each article of circuit access fault simulation unit, comprises singlephase earth fault, phase fault, line to line fault earth fault, three phase short circuit fault etc.
3rd step utilizes the infinitely great power supply and substation transformer model set up and various circuit model networking to build 10kV electricity distribution network model as shown in Figure 1, this 10kV prototype network is connected into radial by 5 overhead transmission lines and 1 cable line, is with 6 groups of load runnings; The accurate analog parameter of the elements such as transformer, power transmission line and arc suppression coil is known, and this accurate parameters refers to that the systematic parameter such as analog ligand electrical network rating operating voltage, rated current, reference power, line impedance, circuit capacitive reactance and relevant device parameter are as simulated the parameter of the parameter of load, the equipment such as parameter, simulation arc suppression coil of analogue transformer.
Certainly, in the simulation application demand of reality, the number of the branch of overhead transmission line and cable line can be many, and the number of load also can be arranged to many groups according to the actual requirements.
4th step is at simulation overhead transmission line, three-phase serial connection installs magnetic balanced method Wound-rotor type zero sequence current mutual inductor (in as Fig. 1 CT0) additional on dummycable circuit head end, and the square winding of paying of Wound-rotor type zero sequence current mutual inductor is succeeded electrical protective device and fault wave recording device and completed 10kV electricity distribution network model containing circuit zero sequence current detecting thus.The test of its zero-sequence current as shown in Figure 3.
In a further embodiment, can have detection to substation transformer neutral point through the transformer neutral point zero-sequence current of arc suppression coil or resistance eutral grounding, the schematic diagram of zero sequence current mutual inductor access neutral point as shown in Figure 4.
The present invention realizes the various operating condition of power distribution network by changing the various earthing mode of analogue transformer neutral point, by simulation than calculating, ensure the positive sequence of model overhead transmission line, cable line, negative phase-sequence and zero sequence impedance and capacitive reactance parameter consistent with the systematic parameter of prototype circuit, also well can simulate prototype circuit operational factor simultaneously, zero-sequence current is had to produce when singlephase earth fault, for dynamic test protective relaying device provides test source;
The inventive method is considered when isolated neutral or the very little feature of the zero-sequence current that produces when the one-phase earthing failure in electric distribution network of grounding through arc, adopt magnetic balanced method Wound-rotor type zero sequence current mutual inductor, by three-phase line and pair side's winding around on same annular core, secondary current value and the measuring accuracy of zero sequence current mutual inductor is substantially increased by magnetic balance principle, constructed model can reflect the various operating condition of various circuit comprehensively truly, solves small current neutral grounding system dynamic simulation experiment produced problem well.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1., based on the circuit zero sequence current analog in power distribution network physical model and a detection method, described power distribution network comprises Wound-rotor type zero sequence current mutual inductor, protective relaying device and fault wave recording device, it is characterized in that, the method comprises the following steps:
(1) infinitely great power supply and substation transformer model is set up, make described substation transformer neutral point have earth-free, through grounding through arc, resistance grounded three kinds of earthing modes, wherein said neutral by arc extinction coil grounding has under-compensation, over compensation operation mode;
(2) set up overhead transmission line or model for cable line, and on every bar circuit preset failure point, line end increase all kinds simulation load;
(3) overhead transmission line of the described substation transformer in described step (1) and acquisition in described step (2) or model for cable line and load model networking is utilized to build 10kV or 35kV electricity distribution network model;
(4) to obtain in the described step (3) be overhead transmission line model in described electricity distribution network model, three-phase serial connection installs magnetic balanced method Wound-rotor type zero sequence current mutual inductor additional on model for cable line head end; the square winding of paying of described Wound-rotor type zero sequence current mutual inductor succeeds electrical protective device and fault wave recording device; complete 10kV or the 35kV electricity distribution network model containing circuit zero sequence current detecting thus, adopt described electricity distribution network model to realize the simulation of described circuit zero-sequence current and described detection method.
2. the method for claim 1, is characterized in that, described step (2) comprises following sub-step:
(2-1) parameter of described overhead transmission line or described model for cable line calculates, according to each transmission line of electricity type in prototype distribution network system, calculate prototype line parameter circuit value, according to prototype system and power analog ratio, current analog ratio, voltage analog ratio, the impedance simulation ratio of model system, calculate the various line parameter circuit values of model system, various load parameter;
(2-2) overhead transmission line model is set up according to prototype system;
(2-3) model for cable line is set up according to prototype system;
(2-4) various load model is set up according to prototype system;
(2-5) bus, line switching model is set up according to prototype system;
(2-6) access fault simulation unit is needed according to experimental study.
3. one kind based on the circuit zero sequence current analog in power distribution network physical model and detection method, described power distribution network comprises protective relaying device, fault wave recording device and Wound-rotor type zero sequence current mutual inductor, and described method comprises step (1) and sets up 10kV or 35kV electricity distribution network model; It is characterized in that, the square winding of paying that the method also comprises step (2) described Wound-rotor type zero sequence current mutual inductor succeeds electrical protective device and fault wave recording device.
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Cited By (4)
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| CN107123348A (en) * | 2017-06-01 | 2017-09-01 | 国网湖北省电力公司电力科学研究院 | A kind of true type equivalent model of high-precision medium-voltage distribution circuit and its calculation method of parameters |
| CN107393383A (en) * | 2017-08-22 | 2017-11-24 | 华中科技大学 | A kind of power network dynamic model and its construction method |
| CN109406955A (en) * | 2019-01-04 | 2019-03-01 | 国网江苏省电力有限公司宿迁供电分公司 | A kind of simulation short circuit and ground fault device |
| CN111781442A (en) * | 2020-06-11 | 2020-10-16 | 广西电网有限责任公司电力科学研究院 | Flexible configuration method and device for power distribution network real-environment test platform line simulation |
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Cited By (5)
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| CN109406955A (en) * | 2019-01-04 | 2019-03-01 | 国网江苏省电力有限公司宿迁供电分公司 | A kind of simulation short circuit and ground fault device |
| CN111781442A (en) * | 2020-06-11 | 2020-10-16 | 广西电网有限责任公司电力科学研究院 | Flexible configuration method and device for power distribution network real-environment test platform line simulation |
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