CN206235817U - The analog circuit of distributed constant power transmission lines - Google Patents
The analog circuit of distributed constant power transmission lines Download PDFInfo
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- CN206235817U CN206235817U CN201621065549.XU CN201621065549U CN206235817U CN 206235817 U CN206235817 U CN 206235817U CN 201621065549 U CN201621065549 U CN 201621065549U CN 206235817 U CN206235817 U CN 206235817U
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The utility model is related to a kind of analog circuit of distributed constant power transmission lines, including lumped resistance, Thevenin's equivalence module, equivalent voltage computing module；Wherein Thevenin's equivalence module includes the first operational amplifier；Equivalent voltage computing module includes the second operational amplifier, and the inverting input of the first operational amplifier of transmission line opposite end is arrived in output to output end voltage after analog-to-digital conversion module, fifo queue module, D/A converter module successively.The utility model reduces component number used by the optimization to circuit structure, saves implementation cost.Simultaneously give the parameter calculation formula for realizing element in circuit for being proposed, using the propagation delay of first original circuit, equivalent resistance, unit length inductance and capacitance parameter, can easily determine the component parameters in circuit.
Description
Technical field
The utility model is related to a kind of analogue technique of distributed power transmission line, and in particular to a kind of distributed constant electric power
The analog circuit of transmission line.
Background technology
Dynamic power system simulations emulation technology mainly uses the dynamic analog device of full physics, by scaled rotation
Forwarding motor, motor, transformer, the element such as circuit are constituted, and are to study basic means of power system behavioral trait and main
Research tool.The advantage of dynamic Simulation Techniques is can relatively accurately to reflect physical phenomenon, is suitable for original physical phenomenon
With the research of system performance, and to relay protection and the experimental study of device etc. such as automatically control.Transent network analyser is main
The research of various quick electromagnetic transition effects in power system is laid particular emphasis on, is one of main tool of research Transient Electromagnetic Phenomena,
The electromagnetic transient of each element in the more accurate simulation power system of energy, is mainly used in Hyper-Voltage of Power Systems research, event
Barrier transient state research and control transient state research.It is used in mixed way with Digital Simulation equipment by by power system simulation simulation model, can
To be formed, function is more powerful, using more flexible and convenient numerical model analysis system, more massive power system can be entered
Row Accurate Model and simulation analysis.
Due to central role of the transmission line in electrical power transmission system, its characteristic to power system has huge shadow
Ring；How to be realized in dynamic power system simulations emulation and transent network analyser technology and accurate simulation practical power systems
In the characteristic of various circuits be very important.In the various characteristics of electrical power system transmission line, characteristics of distributed parameters and frequency
Correlation properties be two than the more significant characteristic laid equal stress on and want, the accuracy of its simulation, for power system (especially HVDC
Transmission system) Dynamic Simulation play vital effect.
Power system power transmission line is typical distributed constant circuit, in the correlative study for being related to power transmission line,
Be frequently necessary to consider its parameter distribution character caused influence.Distributed constant circuit is to must take into consideration circuit element parameter
The circuit of distributivity, the distributivity of parameter refers to voltage and current in the circuit not still function of time, while being also position
Function, in circuit with adjacent 2 points of current potential and electric current are different from a flash.In power system, transmission line is (especially
The remote power transmission line of high voltage) it is typical distributed constant circuit, although because this circuit voltage, the frequency of electric current
Very low (50Hz), wavelength is (6000 kilometers) very long, but its length is up to several hundred kilometers even thousands of kilometers, can be compared with wavelength
Intend, therefore the distributed constant effect of circuit can not be ignored.If concern frequency harmonic characterisitic higher, even for away from
From shorter circuit, it is also desirable to the influence that accurate simulation circuit distributed constant effect is brought.
The content of the invention
Regarding to the issue above, the utility model provides one kind and can be used for dynamic power system simulations emulation, transient network point
The analog circuit of the distributed constant power transmission lines in the fields such as analyzer, electromagnetic transient simulation, circuit analysis and emulation.
To solve the above problems, the technical scheme that the present invention takes is：The analog circuit of distributed constant power transmission lines,
Including lumped resistance, Thevenin's equivalence module, equivalent voltage computing module；Wherein Thevenin's equivalence module is put including the first computing
Big device, the in-phase input end ground connection of the first operational amplifier, its inverting input connects power transmission line opposite end through input resistance
The voltage that equivalent voltage computing module is exported, its inverting input is connected to the defeated of the first operational amplifier through the first feedback resistance
Go out end, its output end is connected to the lumped resistance of analog line distributed resistance by characteristic impedance；Equivalent voltage computing module
Including the second operational amplifier, its in-phase input end is connected to output end and the characteristic impedance of the first operational amplifier through second resistance
Between, its inverting input is connected between characteristic impedance and lumped resistance through first resistor, its in-phase input end and anti-phase input
Respectively through the first earth resistance and the second ground resistance earth, inverting input is connected to the second computing and puts through the second feedback resistance at end
The output end of big device, output end voltage is exported after analog-to-digital conversion module, fifo queue module, D/A converter module successively
To the inverting input of the first operational amplifier of transmission line opposite end.
Thevenin's equivalence module constitutes anti-phase closed loop amplifier using the first operational amplifier that negative-feedback is connected, and it is right to realize
The simulation of circuit Thevenin's equivalence voltage, equivalent voltage computing module is using signed magnitude arithmetic(al) amplifier circuit to the voltage of local terminal
Plus and minus calculation is carried out with electric current, so as to obtain the Thevenin's equivalence voltage of current time opposite end, using analog-to-digital conversion module, advanced
The cascade Connection of first dequeue module and D/A converter module realizes the time delay to Thevenin's equivalence voltage, and time of time delay can be with
By the length precise control of fifo queue module.
Lumped resistance resistance is the half of power transmission lines equivalent resistance.
First feedback resistance resistance is equal to the resistance of input resistance.
Second feedback resistance resistance is equal to second resistance resistance and is two times of first resistor resistance.
Characteristic impedance resistance is obtained by the inductance value of power transmission line unit length circuit and the ratio evolution of capacitance.
The utility model gives a kind of better simply circuit structure, and the distributed parameters for simulating power transmission line are imitated
Should, it is by the combination to commonly using analogy and digital circuit element, it is possible to achieve to the power transmission of any propagation delay
The distributed constant effect of line carries out accurate simulation.
In order to simulate the distributed constant effect of power transmission lines, this patent proposes a kind of new circuit structure, uses electricity
Resistance, operational amplifier, analog, D/A and fifo queue these conventional analogy and digital circuit elements, it is right to realize
The accurate simulation of the power transmission lines distributed constant effect of any propagation delay.By the optimization to circuit structure, reduce
Component number used, saves implementation cost.This patent gives the parameter meter for realizing element in circuit for being proposed simultaneously
Calculate formula, using the propagation delay of first original circuit, equivalent resistance, unit length inductance and capacitance parameter, can be easily true
Make the component parameters in circuit.
Brief description of the drawings
Fig. 1 simulates the circuit structure diagram of power transmission line distributed parameters effect.
Specific embodiment
This patent proposes a kind of new circuit structure, uses resistance, operational amplifier, analog, D/A and first in first out
Queue these conventional analogy and digital circuit elements, realize carries out accurate mould to the distributed parameter line of any propagation delay
Intend；And by optimizing circuit structure, number of elements used is reduced, save implementation cost.
For the ease of description, it is introduced by taking single conductor as an example, during for many conductors, can be carried out similar
Extension.During single conductor, the circuit structure for realizing power transmission lines distributed constant effect is as shown in Figure 1.Whole transmission
Line is divided into side a and b two parts, and due to circuit symmetry in itself, the structure that side a and b is realized is similar, below with A
Described in detail as a example by end.
The analog circuit of distributed constant power transmission lines, as shown in figure 1, A ends simulation circuit structure include lumped resistance,
Thevenin's equivalence module, equivalent voltage computing module.
Wherein Thevenin's equivalence module includes the first operational amplifier, and the in-phase input end of the first operational amplifier is grounded,
Its inverting input is through input resistance RinThe voltage that the B ends equivalence voltage computing module of power transmission line is exported is connect, its is anti-phase
Input is connected to the output end of the first operational amplifier through the first feedback resistance Rf1, and its output end is connected by characteristic impedance Rc
To the lumped resistance R/2 of analog line distributed resistance；R is the equivalent resistance of power transmission lines, and lumped resistance resistance is electricity
The half of power transmission line equivalent resistance.Characteristic impedanceCan be by the inductance L of power transmission line unit length circuit
Obtained with electric capacity C.The operational amplifier of negative-feedback connection can provide great input impedance and minimum output impedance, there is provided
One preferable Thevenin's equivalence voltage implementations；Wherein the first feedback resistance resistance is equal to the resistance of input resistance, full
Sufficient Rf=Rin, so that an anti-phase closed loop amplifier is constituted, therefore the relation between its output voltage Vo and input voltage vin
Meet Vo=-Vin.
Equivalent voltage computing module includes the second operational amplifier, and its in-phase input end is connected to the first fortune through second resistance R2
Calculate between the output end and characteristic impedance Rc of amplifier, its inverting input is connected to characteristic impedance Rc and concentrates through first resistor R1
Between resistance R/2, its in-phase input end and inverting input are grounded through the first earth resistance Rp and the second earth resistance Rn respectively,
Inverting input is connected to the output end of the second operational amplifier through the second feedback resistance Rf2, and output end voltage turns through modulus successively
The anti-phase of the first operational amplifier of transmission line opposite end is arrived in output after mold changing block, fifo queue module, D/A converter module
Input.
The resistance parameter of the second operational amplifier periphery meets following relation：
Therefore the output Vo of operational amplifier is
The Thevenin's equivalence voltage for circuit distributed parameters effect required for being exactly opposite end after delay；Negative-feedback simultaneously
The operational amplifier of connection can provide great input impedance and minimum output impedance, so as to not interfere with the electricity of measuring point
Pressure V1 and V2, and for D A switch module provides preferable output voltage.D/A module and mould/mould module are adopted using identical
Sample frequency, and its sample frequency is determined according to the highest frequency of the voltage and current simulated.The length of fifo queue
Then determined by the sample frequency of the propagation delay and D/A and mould according to power transmission lines/mould module.
Claims (5)
1. the analog circuit of distributed constant power transmission lines, it is characterised in that：Including lumped resistance, Thevenin's equivalence module,
Equivalent voltage computing module；Wherein Thevenin's equivalence module include the first operational amplifier, the first operational amplifier it is same mutually defeated
Enter end ground connection, the electricity that its inverting input is exported through the equivalent voltage computing module that input resistance connects power transmission line opposite end
Pressure, its inverting input is connected to the output end of the first operational amplifier through the first feedback resistance, and its output end passes through characteristic impedance
It is connected to the lumped resistance of analog line distributed resistance；Equivalent voltage computing module includes the second operational amplifier, its same phase
Input is connected between the output end of the first operational amplifier and characteristic impedance through second resistance, and its inverting input is through the first electricity
Resistance is connected between characteristic impedance and lumped resistance, and its in-phase input end and inverting input are respectively through the first earth resistance and second
Ground resistance earth, inverting input is connected to the output end of the second operational amplifier through the second feedback resistance, output end voltage according to
Secondary first computing of the output to transmission line opposite end after analog-to-digital conversion module, fifo queue module, D/A converter module is put
The inverting input of big device.
2. the analog circuit of distributed constant power transmission lines according to claim 1, it is characterised in that：Lumped resistance hinders
It is the half of power transmission lines equivalent resistance to be worth.
3. the analog circuit of distributed constant power transmission lines according to claim 1 and 2, it is characterised in that：First is anti-
Feedback resistance is equal to the resistance of input resistance.
4. the analog circuit of distributed constant power transmission lines according to claim 1 and 2, it is characterised in that：Second is anti-
Feedback resistance is equal to second resistance resistance and is two times of first resistor resistance.
5. the analog circuit of distributed constant power transmission lines according to claim 4, it is characterised in that：Characteristic impedance hinders
Value is obtained by the inductance value of power transmission line unit length circuit and the ratio evolution of capacitance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621065549.XU CN206235817U (en) | 2016-09-19 | 2016-09-19 | The analog circuit of distributed constant power transmission lines |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621065549.XU CN206235817U (en) | 2016-09-19 | 2016-09-19 | The analog circuit of distributed constant power transmission lines |
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| CN206235817U true CN206235817U (en) | 2017-06-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110765494A (en) * | 2018-11-22 | 2020-02-07 | 哈尔滨安天科技集团股份有限公司 | Pin terminal matching circuit for reducing side channel information leakage |
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2016
- 2016-09-19 CN CN201621065549.XU patent/CN206235817U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110765494A (en) * | 2018-11-22 | 2020-02-07 | 哈尔滨安天科技集团股份有限公司 | Pin terminal matching circuit for reducing side channel information leakage |
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