CN107393383A - A kind of power network dynamic model and its construction method - Google Patents
A kind of power network dynamic model and its construction method Download PDFInfo
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Abstract
The invention discloses a kind of power network dynamic model and its construction method, the model includes simulation generator set, transmission line simulation, analogue transformer group, fictitious load and force zero-sequence current distributor, transmission line simulation uses equivalent chain circuit to simulate prototype Transmission Line Distributed Parameter to be segmented lumped parameter, zero-sequence current distributor is forced to be series in transmission line simulation, zero-sequence current distributor is forced to include iron core unit and four phase transmission line, four phase transmission line is wound in iron core unit, it is and equal per the phase power transmission line winding number of turns, it is identical per phase power transmission line winding direction；Zero-sequence current distributor is forced to be used to make the zero-sequence current value of A, B, C three-phase current synthesis and the zero-sequence current value measured in N phases equal and in opposite direction.Constructed model can comprehensively and truly reflect the various operating conditions of prototype transmission line of electricity, solve Complex Power net dynamic simulation experiment produced problem well.
Description
Technical field
The invention belongs to power system experimental study field, more particularly, to a kind of power network dynamic model and its structure
Construction method.
Background technology
Power system is a complicated dynamical system, and when power system is broken down, system changes to separately from a kind of state
A kind of state, and supervene the electromagnetic transient of complexity.But when dynamic simulation experiment is studied, when power system has not
When balanced load and failure, the zero-sequence current value of A, B, C three-phase current synthesis measured on single loop line and the zero sequence measured in N phases
Current value is different, and such model can not truly reflect the dynamic characteristic of prototype system.
Have scholar's research small current neutral grounding system experiment porch development and experiment content exploitation, describe voluntarily develop it is only
The wiring and lectotype selection of vertical small current neutral grounding system experiment porch.But the experimental bench is the demonstration experimental bench of a teaching,
Can only qualitative analysis, it is impossible to quantitative experiment, required without precision etc..Other scholars have carried out single-phase earthing of small current earthing system
The research of malfunction test method, the characteristics of describing small current neutral grounding system and its singlephase earth fault, it is existing to analyze its
Experimental method defect；A kind of experimental method is proposed with reference to small current neutral grounding system experiment porch.The experimental method is actually one
Individual demonstration project, by 380V/10kV transformers, circuit is fully according to 1:1 Equivalent Model is built, and is not dynamic model experiment.Other
Scholar devises Zero-sequence Current Transformer with High Performance, and it is mutual to describe the novel zero-sequence current that a kind of design method with uniqueness designs
The technical parameters and performance parameter of sensor, compared with traditional product, it has good excellent of unique structure, high sensitivity, angle characteristic
Point.But because a zero-sequence current of dynamic model experiment room is very small, this method is not suitable for making in the research of non-equivalent dynamic model
With.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, the invention provides a kind of power network dynamic model and its structure
Construction method, thus solves existing power network dynamic model due to being led using N phase power transmission line analogsimulation prototype power system earth mats
The unequal technical problem of zero-sequence current value for causing zero-sequence current value to be synthesized with by A, B, C three-phase current.
To achieve the above object, according to one aspect of the present invention, there is provided a kind of power network dynamic model, including：
Simulation generator set, transmission line simulation, analogue transformer group, fictitious load and zero-sequence current is forced to distribute
Device, transmission line simulation use equivalent chain circuit to simulate prototype Transmission Line Distributed Parameter to be segmented lumped parameter, forced
Zero-sequence current distributor is series in transmission line simulation；
Zero-sequence current distributor is forced to include iron core unit and four phase transmission line, four phase transmission line is wound in iron core unit
On, and it is equal per the phase power transmission line winding number of turns, identical per phase power transmission line winding direction, one end of four phase transmission line, which is formed, forces zero
The input of sequence distributing switch, the other end of four phase transmission line form the output end for forcing zero-sequence current distributor；Force zero
Sequence distributing switch be used for make A, B, C three-phase current synthesize zero-sequence current value it is equal with the zero-sequence current value measured in N phases and
In the opposite direction；
Wherein, four phase transmission line is A phases power transmission line, B phases power transmission line, C phases power transmission line and N phase power transmission lines；A phases are transmitted electricity
Line, B phases power transmission line, C phases power transmission line and N phases power transmission line simulate respectively A phases power transmission line in prototype transmission line of electricity, B phases power transmission line,
C phases power transmission line and ground wire.
Preferably, iron core unit is annular, and the cross section of iron core unit is circle.
Preferably, every phase power transmission line of zero-sequence current distributor is forced to be made by twisting by stranded conductor.
Preferably, when transmission line simulation is double circuit line, is at least connected in each double circuit line one and force zero
Sequence distributing switch, and zero-sequence current distributor is forced on non-experiment transmission line of electricity.
Preferably, when transmission line simulation is loop network circuit, at least connected in each loop network circuit one strong
Compel zero sequence distributing switch, and force zero-sequence current distributor on non-experiment transmission line of electricity.
Preferably, when transmission line simulation includes double circuit line and loop network circuit, in each loop network circuit
At least connect one and force zero-sequence current distributor, at least connected in each double circuit line one and force zero-sequence current to distribute
Device, and zero-sequence current distributor is forced on non-experiment transmission line of electricity.
It is another aspect of this invention to provide that providing a kind of construction method of power network dynamic model, comprise the following steps：
(1) establish and simulate infinitely great power supply and simulation generator system, and be connected by simulating step-up transformer with bus；
(2) transmission line simulation is established, transmission line simulation includes a plurality of π types power transmission line, and first in every π types power transmission line
End sets belt current, the analog switch of voltage measurement transformer；
(3) the choice experiment circuit from transmission line simulation, and the preset failure analogue unit on experimental line, testing
Line end increase all kinds simulation load；
(4) by the electric current on experimental line on two end switch, voltage transformer secondary signal Access Control protection device and
Fault wave recording device；
(5) non-experimental line end concatenation forces zero-sequence current distributor in transmission line simulation, so as to complete electric power
The modeling of net dynamic model, the impedance in zero sequence loop is avoided to the influence of experimental line.
Preferably, when transmission line simulation is double circuit line, is at least connected in each double circuit line one and force zero
Sequence distributing switch, and zero-sequence current distributor is forced on non-experiment transmission line of electricity.
Preferably, when transmission line simulation is loop network circuit, at least connected in each loop network circuit one strong
Compel zero sequence distributing switch, and force zero-sequence current distributor on non-experiment transmission line of electricity.
Preferably, when transmission line simulation includes double circuit line and loop network circuit, in each loop network circuit
At least connect one and force zero-sequence current distributor, strong one urgent zero-sequence current distribution of at least being connected in each double circuit line
Device, and zero-sequence current distributor is forced on non-experiment transmission line of electricity.
In general, by the contemplated above technical scheme of the present invention compared with prior art, it can obtain down and show
Beneficial effect：
(1) present invention considers the characteristics of zero-sequence current shunts in power network dynamic model, using magnetic balanced method Wound-rotor type
Force zero-sequence current distributor：By four lines in model primary system and it is wound on same annular core, it is former by magnetic balance
Reason, by the electric current that N lines flow through be forced into the line of A, B, C tri- synthesize size of current it is equal, in opposite direction, so as to solve electric power
Zero-sequence current distribution produced problem in net dynamic model.
(2) present invention forces zero-sequence current distributor by increasing in double loop transmission system or loop network, leads to
Simulation is crossed than calculating, positive sequence, negative phase-sequence and the zero sequence impedance and capacitive reactance parameter and prototype circuit for ensureing model transmission line of electricity are
Parameter of uniting is consistent, while can also simulate prototype circuit normal operational parameters well, when there is out-of-balance load and failure, its
Transient characterisitics are also consistent with prototype system.Constructed model can comprehensively and truly reflect the various operating conditions of transmission line of electricity,
Solves Complex Power net dynamic simulation experiment produced problem well.
Brief description of the drawings
Fig. 1 is electric transmission line positive sequence three-phase network in existing power network dynamic model；
Fig. 2 is power transmission line zero-sequence three-phase network in existing power network dynamic model；
Fig. 3 is power transmission line zero-sequence in existing power network dynamic model, positive sequence merging three-phase network；
Fig. 4 is when transmission line simulation is the equiva lent impedance figure of double circuit line in existing power network model；
Fig. 5 is the structure chart provided by the invention for forcing zero-sequence current distributor；
Fig. 6 is the structure chart provided by the invention for forcing iron core unit in zero-sequence current distributor；
Fig. 7 is forced in zero-sequence current distributor per phase transmission line structure figure to be provided by the invention；Wherein, Fig. 7 (a) serves as reasons
The transmission line structure figure that 7 strands of wire strandings form, Fig. 7 (b) are the transmission line structure figure formed by 19 strands of wire strandings；
Fig. 8 is the network of power network dynamic model in double loop provided by the invention；
Fig. 9 is the network of annular power network dynamic model provided by the invention；
Figure 10 is the network of Complex Power net dynamic model provided by the invention；
Figure 11 is the wiring diagram for forcing zero-sequence current distributor；
Figure 12 is that power network dynamic model provided by the invention runs oscillogram, wherein, Figure 12 (a) is power network dynamic analog
Oscillogram when type normal duty is run, oscillogram when Figure 12 (b) is power network dynamic model failure operation.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in each embodiment of invention described below
Conflict can is not formed each other to be mutually combined.
Due to the complexity of power system, when studying power system asymmetric load or failure, often using positive sequence, negative
Sequence, the analysis method of zero sequence.In dynamic simulation laboratory, model of power transmission system, the similar of external electromagnetic field is not required typically,
The process of ripple is not required along the similar of circuit spread speed, and only requires on circuit the voltage of some points and electric current anaplasia at any time yet
Change process it is similar, thus equivalent chain circuit can be used to be segmented lumped parameter come simulation distribution parameter, when on model
When studying the various methods of operation of power system and electromechanical transient process, such model of power transmission system is can to meet completely
's.
But in the asymmetric load of research model system or failure, A, B, C three-phase current measured on single loop line synthesizes
Zero-sequence current value and the zero-sequence current value that is measured in N phases it is different, reason be this circuit zero-sequence current by adjacent lines or
N lines in person's ring network flow away (zero-sequence current distribution is asymmetric), cause control protective unit to malfunction, such model is not
The dynamic characteristic of prototype system can truly be reflected.
The model system of zero-sequence current distributor is forced being not used, produces the zero sequence electricity synthesized by A, B, C three-phase current
The reason for flow valuve and the inconsistent zero-sequence current value measured in N phases, is as follows：
In practical power systems, because transmission line of alternation current is usually to be made up of three-phase conducting wire, there is it per phase conductor originally
The inductance of body, there are mutual inductance and electric capacity between wire and wire, also there is mutual inductance between wire and the earth and between aerial earth wire
And electric capacity, if dual loop transmission line, then there is also mutual inductance and electric capacity between loop and loop, such a contact is extremely
Complicated circuit, when with lumped parameter to simulate, it is necessary to consider these effects connected each other.
It is most easy if the open-phase operation mode of circuit need not be studied in the simulation of power system non-equivalent
Analogy method is that transmission line of electricity is simulated using common chain loop, and in other words, the simulation of transmission line of electricity is not by it
Geometric parameter is similar, but similar by its phase sequence network parameter.This analogy method, more difficult mutual inductance simulation can be both saved,
Component number can be reduced by transformation calculations again.
If every kilometer of positive sequence network parameter (for transmission line of electricity, negative phase-sequence is also same) is following (in terms of every phase)：
X1- forward-sequence reactance (Ω/km)；r1- positive sequence resistance (Ω/km)；b1- positive sequence susceptance (S/km)；G1- positive sequence electricity
Lead (S/km)；
Transmission line of electricity is as follows per mutually every kilometer of zero-sequence network parameter：
X0- zero-sequence reactance (Ω/km)；r0- zero sequence resistance (Ω/km)；b0- zero sequence susceptance (S/km)；G0- zero sequence electricity
Lead (S/km)；
If simulating one section of circuit that length is L kilometers with a π type rings section, each parameter all should be multiplied by L above.Such as
Ignore conductance G1And G0Disregard, then positive sequence (negative phase-sequence be also the same) three-phase network of this section of power transmission line can with the figure shown in Fig. 1 come
Simulation.The three characteristics of the middle term is symmetrical, and the parameter of a phase is only marked in figure.Its zero-sequence network can be simulated with Fig. 2.
Now the two networks are combined into one, it is reflected positive sequence (negative phase-sequence) and zero sequence process while being enough correct.By
In noticing that positive sequence (negative phase-sequence) reactance is merely able to by phase line, and zero-sequence current is made up of a passage phase line with entering, therefore will
A part (the X of zero sequence impedance0And r0), move on to ground wire and have no effect on its process, after so merging, three-phase network shown in Fig. 3 can be obtained
Wiring diagram.
It can be seen from figure 3 that the parameter that positive sequence (negative phase-sequence) electric current passes through does not change, and Zero sequence parameter then changes, so must
Its equivalent parameters must be obtained.In figure 3, the zero-sequence current flowed through in three phase lines is I0And the electric current for flowing through zero line is then
3I0.Total pressure drop is：
But in Fig. 2 zero-sequence network, total pressure drop is：
The total pressure drop of two aboveShould be equal, that is, have：
jx0l+r0L=jx1l+r1l+3(jxNl+rNl) (3)
Expansion abbreviation can obtain：
In the same way, can be in the hope of
From with above-mentioned formula, in equivalent π types model of power transmission system, the impedance value that the neutral conductor should access is respectively zero
/ 3rd of the difference of sequence and positive sequence impedance value.Relational expression above is all correct for single loop and dual loop transmission line
's.
For single loop transmission line of electricity, when in view of aerial earth wire, it is in the impedance of center line access：
And for double circuit line (as shown in Figure 4), then for：
In formula, zm--- the alternate mutual inductive impedance of the same circuit；z'mThe alternate mutual inductive impedance of-different circuit；zTm——
Mutual inductive impedance between aerial earth wire and power transmission line；z'Tm--- the mutual inductance between every identical second servo loop aerial earth wire in the first loop
Impedance；zαβ--- the mutual inductive impedance between two aerial earth wires；z'αβ--- the mutual inductive impedance between different circuit aerial earth wire,
zT--- the self-induction impedance of aerial earth wire.
In summary, specially designed by the zero sequence loop in model system, it is different with the pattern of prototype system, because
This, in the case of it loop network be present in model system, the characteristic of the zero-sequence network model being made up of transmission line simulation just with
The characteristic of prototype system zero-sequence network is different, when the different ratio of transmission line simulation positive sequence impedance and the ratio of zero sequence impedance
Not simultaneously as the asymmetry of prototype network zero sequence structure, the distribution for allowing for zero-sequence current are not consistent with prototype system, led
Cause in the model containing double loop transmission system or loop network, when unbalanced fault occurs or asymmetric load be present
When, zero-sequence current can shunt from adjacent lines, i.e., zero-sequence current and caused electric current on zero line caused by faulty line three-phase
It is inconsistent.
Power network dynamic model provided by the invention, including simulation generator set, transmission line simulation, analogue transformer
Group, fictitious load and zero-sequence current distributor is forced, transmission line simulation uses equivalent chain circuit to be segmented lumped parameter
To simulate prototype Transmission Line Distributed Parameter, zero-sequence current distributor is forced to be series in transmission line simulation.
Zero-sequence current distributor is forced to include iron core unit and four phase transmission line, four phase transmission line is wound in iron core unit
On, and it is equal per the phase power transmission line winding number of turns, identical per phase power transmission line winding direction, one end of four phase transmission line, which is formed, forces zero
The input of sequence distributing switch, the other end of four phase transmission line form the output end for forcing zero-sequence current distributor；Force zero
Sequence distributing switch be used for make A, B, C three-phase current synthesize zero-sequence current value it is equal with the zero-sequence current value measured in N phases and
In the opposite direction；
Wherein, four phase transmission line is A phases power transmission line, B phases power transmission line, C phases power transmission line and N phase power transmission lines；A phases are transmitted electricity
Line, B phases power transmission line, C phases power transmission line and N phases power transmission line simulate respectively A phases power transmission line in prototype transmission line of electricity, B phases power transmission line,
C phases power transmission line and ground wire.
Therefore A, B, the C tri- measured on single loop line is made using zero-sequence current distributor is forced in power network dynamic model
The zero-sequence current value of phase current synthesis is equal with the zero-sequence current value measured in N phases, so that model correctly reflects prototype system
Dynamic characteristic.I.e.：Each current vector IA+IB+IC=-IN；So as to meet Complex Power net, such as double loop transmission of electricity, ring network
Network has requirement of the Complex Power pessimistic concurrency control of looped network to zero-sequence network, model system is more truly reflected that prototype system is electric
Variation characteristic is measured, is an important analogy method for carrying out dynamic power system simulations experiment scientific research.
Fig. 5 is the structure chart provided by the invention for forcing zero-sequence current distributor embodiment, and what it is by model circuit is once
The line of A, B, C, N tetra- in system is simultaneously wound on same annular core, i.e.,：A1, b1, c1, n1 are inlet wire, and a2, b2, c2, n2 are
Line, in the case of asymmetrical three-phase, by magnetic balance principle, the electric current that N lines flow through is forced into and synthesizes electricity with the line of A, B, C tri-
Flow equal in magnitude, in opposite direction.Fig. 6 is the structure chart provided by the invention for forcing iron core unit in zero-sequence current distributor, by force
The iron core for compeling zero sequence distributor is the annular core using high magnetic permeability, and core section is circle, reduces leakage field, it can make to swash
Magnetic loss substantially reduces, it is desirable to the unloaded Ω of exciting impedance ＞ 1200, improves the precision for forcing zero sequence distributor；Short-circuit voltage ＜
1.0V (800V or 1000V model system), reduction force influence of the zero-sequence current distributor to power network dynamic model；Saturation
60 times of multiple ＞.In view of frequency characteristic and the kelvin effect of wire, when making forces zero-sequence current distributor, core material
To use special silicon steel material, and be made using silicon steel sheet stacking pattern, make it have good high frequency characteristics (50Hz~
2500Hz), to ensure model system in misoperation, frequency characteristic and the prototype system of zero-sequence current are consistent.Simultaneously
For simulating below 500kV systems, using 7 strands of wire strandings into a phase, as shown in Fig. 7 (a)；For simulation 500kV and more than
System, using 19 strands of wire strandings into a phase, as shown in Fig. 7 (b).For the rated current no-load voltage ratio of general dynamic model experiment room：IA、
IB, IC/IN 20A, 20A, 20A/20A, the current density of wire require every square millimeter of ＜ 0.4A.
Fig. 8 is type power network dynamic model in double loop provided by the invention, including simulation generator 01G, simulation generator
02G and infinitely great power supply 81W, transmission line simulation include 200km 23XL, 100km 21XL and 100km 22XL, electric power
System is extremely complex, can cause failure because of thunderbolt, branch in any position of transmission line of electricity, in 200km length
Many places are broken down on 23XL circuits, and caused zero-sequence current can shunt from 21XL+22XL circuits so on 23XL circuits, i.e.,
The zero-sequence current value of A, B, C three-phase current synthesis measured on 23XL circuits differs with the zero-sequence current value measured in 1N phases
Sample, it is different with prototype system, the erroneous judgement of control protection equipment can be caused, it is truly anti-not reach dynamic model experiment requirement model system
Reflect the dynamic characteristic of prototype system.Therefore, it is necessary to using zero-sequence current distributor is forced, current value and A, B, C tri- in N phases are forced
The zero-sequence current value of phase current synthesis is equal.If the model is to be directed to 23XL circuits progress 200km long transmission line Protections, one
As suggest force zero-sequence current distributor to be serially connected in non-experimental line, i.e., on 21XL or 22XL circuits.
Fig. 9 is annular power network dynamic model provided by the invention, including simulation generator 01G, simulation generator 02G and
Infinitely great power supply 82W, 100km 11XL, 75km 12XL and 50km 13XL form annular electric power pessimistic concurrency control, if be directed to
11XL circuits carry out 100kM long transmission line Protections, force zero-sequence current distributor should be serially connected in non-experimental line 12XL or
On person's 13XL circuits.
Figure 10 is Complex Power net dynamic model provided by the invention, the controllable series capacitance containing TCSC in 500kV systems
Compensation device and FCS compensator with series capaci tance, it is a 500kV flexible ACs double loop transmission system, therefore in 51XL lines
It is serially connected with road and forces zero-sequence current distributor；The VSC-HVDC containing flexible direct current power transmission system in 220kV systems, the 220kV
Contain multiple loop networks in Ac/dc Power Systems, because zero sequence problem is not present in straight-flow system, therefore only exchange ring at one
Concatenation forces zero-sequence current distributor in l network, is serially connected with 26XL circuits forces zero-sequence current to distribute as shown in Figure 10
Device.If changing flexible direct current power transmission system into AC transmission system, the concatenation on 3 circuits is at least needed to force zero sequence electric
Fluidic distributor.
Force on the non-test circuit that zero-sequence current distributor should be installed in double loop or loop network, have in principle
The bus of m bar outlets should set m-1 distributor.The transformer of neutral earthing forces distributional effects to zero-sequence current, so,
The bus of one two lines of change only needs one to force distributor.Force the circuit of distribution function also finally to force in addition, having possessed
The branch road of distributional effects, so, at least require there is to force a zero-sequence current distributor in a double loop or loop network.
Figure 11 is the wiring diagram for forcing zero-sequence current distributor, forces A phases power transmission line in zero-sequence current distributor to be connected serially to
A phases power transmission line in transmission line simulation, the like, it is defeated to compel B phases power transmission line, C phases power transmission line, N phases in zero sequence distributing switch
Electric wire is connected with B phases power transmission line, C phases power transmission line, N phase power transmission lines in transmission line simulation successively.
Figure 12 (a) is waveform of the power network dynamic model provided by the invention when normal symmetric load is run, now I0
=In=0；When this circuit B phases break, now Ib=0, In amplitude size is Ia+Ic sums, in the opposite direction, is such as schemed
Shown in 12 (b).
The construction method of power network dynamic model provided by the invention, comprises the following steps：
(1) establish and simulate infinitely great power supply and simulation generator system, be connected by simulating step-up transformer with bus；
(2) a plurality of π types model of power transmission system is established, and has belt current, voltage measurement transformer at every circuit first and last end
Analog switch；
(3) the preset failure point on experimental line, in line end increase all kinds simulation load；
(4) by the electric current on experimental line on two end switch, voltage transformer secondary signal Access Control protection device and
Fault wave recording device；
(5) it is π types circuit model in simulation power network to be obtained in the step (2), (3), being transmitted electricity for double loop is
In system or loop network, in non-experimental line end A, B, C, N, totally 4 phases concatenation forces zero-sequence current distributor, so as to complete
The modeling of electric power system model containing double back transmission line or loop network, the impedance in zero sequence loop is avoided to the shadow of experimental line
Ring.
The present invention is to use to force zero-sequence current distributor to carry out power network in power system dynamic model experimental study
The correct analogy method of zero-sequence network in physical model, illustrate by taking Complex Power net dynamic model as an example, its specific building process is：
1st step establishes Infinite bus system model (21W) as shown in 500kV circuits right end portion in Figure 10, establishes contact and becomes
Depressor, as established simulation generator model (01G/02G/03G) in Figure 10, it is connected by step-up transformer with respective bus.
2nd step establishes various π types circuit models (XL) as shown in 500kV, 220kV part in Figure 10, and in each line
Road access belt current, the analog switch of voltage measurement transformer QF51-QF54, QF31-QF36, QF41- as shown in Figure 10
QF44 analog lines switch, and each parameter of wherein circuit modeling includes：Z1 is the positive sequence impedance of analog line；Zn is analog line
Neutral wire impedance；C1 is the positive sequence electric capacity of analog line；Cn is the middle line capacitance of analog line.
2.1st step simulates overhead transmission line or the parameter of cable run calculates, each transmission of electricity in prototype electric power pool
Circuit types, calculate power analog ratio, current analog ratio, voltage of the prototype line parameter circuit value according to prototype system and model system
Simulation ratio, impedance simulation ratio, calculate the various line parameter circuit values of model system, various load parameters.
2.2nd step establishes overhead transmission line model, including the wiring of π types and joint use.
2.3rd step establishes model for cable line, including π type connection circuitries.
2.4th step establishes various load models, includes simulation rotary load, simulation static load, out-of-balance load and not
With the various operating modes of big Smaller load.
2.5th step establishes bus, line switching model.
2.6th step accesses fault simulation unit in each article of circuit, includes singlephase earth fault, phase fault, two
Phase short circuit grounding failure, three phase short circuit fault etc..
3rd step utilizes the infinitely great power supply, simulation generator and various transformer models and various circuit models established
Complex Power pessimistic concurrency control as shown in Figure 10 is built in networking, and the prototype network is defeated by 10 transmission line of alternation currents and 3 direct currents
Electric line is connected into multiple loop networks, 5 groups of load runnings of band；The elements such as generator, transformer, transmission line of electricity and load it is accurate
Analog parameter, it is known that the accurate parameters refer to simulate power network rating operating voltage, rated current, reference power, line impedance,
The parameter, the parameter of analogue transformer, simulation generator of the systematic parameters such as circuit capacitive reactance and relevant device parameter as simulated load
Etc. the parameter of equipment.
Certainly in the simulation application demand of reality, the bar number of the branch of transmission line of alternation current and DC power transmission line can be with
To be a plurality of, and load number can also be arranged to according to the actual requirements it is multigroup.
4th step fills by the electric current on experimental line on two end switch, voltage transformer secondary signal Access Control protection
Put and fault wave recording device.
500kV circuits are a double-circuit systems in 5th step such as Figure 10, it is therefore desirable to which concatenation forces zero-sequence current to distribute
Device, position QF54 switch and 51XL circuits between, series-mounting be by 51XL line outlets and QF54 switch outlet A, B,
C, N-terminal is with forcing zero-sequence current distributor both ends to be connected；As 220kV circuits have a loop-type network system in Figure 10, therefore
Concatenation is needed to force zero-sequence current distributor, position is switched between 26XL circuits in 03QF, and series-mounting is the same, so as to complete
Electric power pessimistic concurrency control is established.
In a further embodiment, can be directed to containing loop cable circuit and the mixing of overhead transmission line and cable run
Electric power pessimistic concurrency control, or for the very small ring distribution system model of zero-sequence current, in non-test cable run or overhead line
Head or the tail end installing on road force zero-sequence current distributor, can force the correct distribution of zero-sequence current.
The double loop power network dynamic shown in Fig. 8 is established using the method for establishing the dynamic model of Complex Power net shown in Figure 10
Model and annular power network dynamic model.
Dynamic power system simulations are the physical models set up according to the principle of similitude, it is desirable to which model system characteristic will be with
The characteristic of prototype system is consistent, in containing double loop transmission system or loop network electric power system model, occurs asymmetric
When load and failure, zero-sequence current can shunt from adjacent lines, i.e., caused by faulty line three-phase on zero-sequence current and zero line
Caused electric current is inconsistent, inconsistent for the zero sequence and prototype system of this double loop transmission system or loop network, therefore
This should transmit electricity in the disadvantages described above or Improvement requirement of prior art, power network dynamic model provided by the invention in double loop
Increase forces zero-sequence current distributor in system, loop network or complex network, makes zero-sequence current caused by circuit three-phase
It is consistent with caused electric current on zero line.Power network dynamic model construction method provided by the invention, the construction method in strict accordance with
Model is established in the requirement of power industry standard, by the way of magnetic balance, is simulated the dynamic characteristic of prototype system, is made model system
More truly reflect prototype system electrical quantity variation characteristic.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, all any modification, equivalent and improvement made within the spirit and principles of the invention etc., all should be included
Within protection scope of the present invention.
Claims (10)
- A kind of 1. power network dynamic model, it is characterised in that including：Simulation generator set, transmission line simulation, analogue transformer group, fictitious load and force zero-sequence current distributor, mould Intending transmission line of electricity uses equivalent chain circuit to simulate prototype Transmission Line Distributed Parameter to be segmented lumped parameter, forces zero sequence electric Fluidic distributor is series in transmission line simulation；Zero-sequence current distributor is forced to include iron core unit and four phase transmission line, four phase transmission line is wound in iron core unit, and Equal per the phase power transmission line winding number of turns, identical per phase power transmission line winding direction, one end of four phase transmission line, which is formed, forces zero sequence electric The input of fluidic distributor, the other end of four phase transmission line form the output end for forcing zero-sequence current distributor；Force zero sequence electric Fluidic distributor be used to synthesizing A, B, C three-phase current zero-sequence current value is equal with the zero-sequence current value measured in N phases and direction Conversely；Wherein, four phase transmission line is A phases power transmission line, B phases power transmission line, C phases power transmission line and N phase power transmission lines；A phases power transmission line, B phases It is defeated that power transmission line, C phases power transmission line and N phases power transmission line simulate A phases power transmission line in prototype transmission line of electricity, B phases power transmission line, C phases respectively Electric wire and ground wire.
- 2. power network dynamic model as claimed in claim 1, it is characterised in that the iron core unit is annular, and the iron Core unit cross section is circle.
- 3. power network dynamic model as claimed in claim 1 or 2, it is characterised in that the zero-sequence current distributor that forces It is made by twisting per phase power transmission line by stranded conductor.
- 4. the power network dynamic model as described in any one of claims 1 to 3, it is characterised in that the transmission line simulation is At least connected during double circuit line, in each double circuit line one and force zero-sequence current distributor, and force zero-sequence current point Orchestration is on non-experiment transmission line of electricity.
- 5. the power network dynamic model as described in any one of Claims 1-4, it is characterised in that the transmission line simulation is During loop network circuit, at least connected in each loop network circuit one and force zero-sequence current distributor, and force zero sequence electric Fluidic distributor is on non-experiment transmission line of electricity.
- 6. the power network dynamic model as described in any one of claim 1 to 5, it is characterised in that the transmission line simulation bag Containing double circuit line and during loop network circuit, at least connected one in each loop network circuit and force zero-sequence current to distribute Device, at least connect one in each double circuit line and force zero-sequence current distributor, and force zero-sequence current distributor positioned at non- Test on transmission line of electricity.
- 7. a kind of construction method of the power network dynamic model based on described in claim 1, it is characterised in that including following step Suddenly：(1) establish and simulate infinitely great power supply and simulation generator system, and be connected by simulating step-up transformer with bus；(2) transmission line simulation is established, transmission line simulation includes a plurality of π types power transmission line, and at every π type power transmission line first and last end Belt current, the analog switch of voltage measurement transformer are set；(3) the choice experiment circuit from transmission line simulation, and the preset failure analogue unit on experimental line, in experimental line End increase all kinds simulation load；(4) by the electric current on experimental line on two end switch, voltage transformer secondary signal Access Control protection device and failure Wave recording device；(5) non-experimental line end concatenation forces zero-sequence current distributor in transmission line simulation, is moved so as to complete power network The modeling of states model, the impedance in zero sequence loop is avoided to the influence of experimental line.
- 8. construction method as claimed in claim 7, it is characterised in that when the transmission line simulation is double circuit line, often At least connected in individual double circuit line one and force zero-sequence current distributor, and force zero-sequence current distributor defeated positioned at non-experiment In electric line.
- 9. construction method as claimed in claim 7 or 8, it is characterised in that the transmission line simulation is loop network circuit When, at least connect one in each loop network circuit and force zero-sequence current distributor, and force zero-sequence current distributor to be located at On non-experiment transmission line of electricity.
- 10. the construction method as described in any one of claim 7 to 9, it is characterised in that the transmission line simulation includes double back When route road and loop network circuit, at least connected in each loop network circuit one and force zero-sequence current distributor, each At least connected in double circuit line one and force zero-sequence current distributor, and force zero-sequence current distributor to be transmitted electricity positioned at non-experiment On circuit.
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| CN107393383B (en) | 2018-04-10 |
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