CN109270380B - Travelling wave measuring circuit of traction power supply system - Google Patents
Travelling wave measuring circuit of traction power supply system Download PDFInfo
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- CN109270380B CN109270380B CN201811209635.7A CN201811209635A CN109270380B CN 109270380 B CN109270380 B CN 109270380B CN 201811209635 A CN201811209635 A CN 201811209635A CN 109270380 B CN109270380 B CN 109270380B
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- 239000003990 capacitor Substances 0.000 claims description 35
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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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
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The embodiment of the invention provides a traveling wave measurement circuit of a traction power supply system, which comprises the following components: a multiple harmonic trap circuit, an inverse proportion amplifier circuit, a subtractor circuit and an adder circuit; the output end of the multiple harmonic trap circuit is connected with the input end of the subtracter circuit, and the output end of the subtracter circuit and the output end of the inverse proportion amplifier circuit are respectively connected with the input end of the adder circuit. The embodiment of the invention carries out multiple wave trapping on the harmonic wave through the multiple wave trap circuit, realizes the mode of subtracting the amplified traveling wave signal from the multiple wave trapping through the subtracter circuit, realizes the high-pass filtering of the large-amplitude power frequency signal and the traveling wave signal after the amplification, and can accurately filter the large-amplitude power frequency signal and the traveling wave signal after the amplification by adding the traveling wave signal in opposite phase, thereby completely and accurately providing the traveling wave signal of the required traction power supply system.
Description
Technical Field
The embodiment of the invention relates to the field of rail transit traction power supply design, in particular to a traction power supply system traveling wave measuring circuit.
Background
The traction power supply system is used for providing a power source for train operation and is an electric power supply of driving key equipment such as along-road signals, station rooms and the like. Because the train can suffer large load impact in the running process, the traction power supply system has power frequency impact load current and short-circuit fault current far exceeding those of a common power supply line when in fault and average running, and line running harmonic waves generated when the impact load arrives. When traveling wave positioning or measuring is carried out on the faults of the traction power supply system, the power frequency signals and the operation harmonic waves in the collected traveling waves are required to be filtered. In the traveling wave measurement method in the prior art, a filter is added on a common traveling wave acquisition circuit to separate a traveling wave signal from a power frequency signal, but a large-amplitude power frequency signal and an operation harmonic signal cannot be effectively separated, so that the existing traveling wave filtering means cannot meet the traveling wave measurement requirement of a traction power supply system.
Disclosure of Invention
In order to solve the above problems, embodiments of the present invention provide a traction power supply system traveling wave measurement circuit that overcomes or at least partially solves the above problems.
The embodiment of the invention provides a traveling wave measurement circuit of a traction power supply system, which comprises the following components: a multiple harmonic trap circuit, an inverse proportion amplifier circuit, a subtractor circuit and an adder circuit; the output end of the multi-harmonic trap circuit is connected with the input end of the subtracter circuit, and the output end of the subtracter circuit and the output end of the inverse proportion amplifier circuit are respectively connected with the input end of the adder circuit; the multi-harmonic trap circuit is used for receiving the amplified traveling wave signals of the traction power supply system, then performing high-resistance filtering on the power frequency signals and the running harmonic signals in the amplified traveling wave signals, and inputting the obtained trapped traveling wave signals to the subtractor circuit; the subtracter circuit is used for performing difference processing on the trapped traveling wave signal and the amplified traveling wave signal, and inputting the obtained power frequency signal and the operation harmonic signal into the adder circuit; the inverse proportion amplifier circuit performs inverse processing on the amplified traveling wave signal and inputs the obtained inverse amplified signal to the adder circuit; the adder circuit is used for carrying out summation processing on the power frequency signal, the operation harmonic signal and the reverse phase amplification signal, and taking a processing result as a travelling wave signal measuring result of the traction power supply system.
According to the traveling wave measuring circuit of the traction power supply system, provided by the embodiment of the invention, the harmonic wave is subjected to multiple wave trapping through the multiple wave trap circuit, the mode of subtracting the amplified traveling wave signals from the multiple wave trapping is realized through the subtracter circuit, the high-pass-like filtering of the large-amplitude power frequency signals and the traveling wave signals is realized, and the traveling wave signals are added with the amplified traveling wave signals in an opposite phase manner, so that the large-amplitude power frequency signals and the traveling wave signals can be accurately filtered, and the traveling wave signals of the required traction power supply system are completely and accurately provided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is apparent that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
Fig. 1 is a schematic structural diagram of a traveling wave measurement circuit of a traction power supply system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a traveling wave measurement circuit of a traction power supply system according to another embodiment of the present invention;
in the figure, 101: a small signal amplifying circuit; 102: a multiple harmonic trap circuit; 103: a subtractor circuit; 104: an inverse proportion amplifier circuit; 105: an adder circuit.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order to solve the problem that in the prior art, a large-amplitude power frequency signal and an operation harmonic signal cannot be separated from a traveling wave signal, an embodiment of the invention provides a traveling wave measurement circuit of a traction power supply system, and referring to fig. 1, the circuit comprises:
a multiple harmonic trap circuit 102, an inverse proportion amplifier circuit 104, a subtractor circuit 103, and an adder circuit 105; an output end of the multiple harmonic trap circuit 102 is connected with an input end of the subtractor circuit 103, and an output end of the subtractor circuit 103 and an output end of the inverse proportion amplifier circuit 104 are respectively connected with an input end of the adder circuit 105; the multiple harmonic trap circuit 102 is configured to receive the amplified traveling wave signal of the traction power supply system, perform high-resistance filtering on the amplified traveling wave signal, and input the obtained trapped traveling wave signal to the subtractor circuit 103; the subtractor circuit 103 is configured to perform a difference processing on the trapped traveling wave signal and the amplified traveling wave signal, and input the obtained power frequency signal and the operation harmonic signal to the adder circuit 105; the inverse proportion amplifier circuit 104 performs an inverse process on the amplified traveling wave signal, and inputs the obtained inverse amplified signal to the adder circuit 105; the adder circuit 105 is configured to sum the power frequency signal, the running harmonic signal, and the inverted amplified signal, and use the processing result as a traveling wave signal measurement result of the traction power supply system.
Specifically, firstly, the traveling wave signals in the traction power supply system are collected, then the traveling wave signals are amplified to obtain amplified traveling wave signals, and the specific mode of the amplification is not limited in the embodiment of the invention. The multiple harmonic trap circuit 102 is configured to receive the amplified traveling wave signal, perform high-resistance filtering on the power frequency signal and the running harmonic signal in the amplified traveling wave signal, and output a trapped traveling wave signal. In addition, the multiple harmonic trap circuit 102 can perform multiple harmonic filtering, so that a large-amplitude power frequency signal and an operation harmonic signal can be filtered.
The subtractor circuit 103 is configured to receive the amplified signal and the traveling wave signal after the notch, perform subtraction processing, and output a power frequency signal and an operating harmonic signal. The inverse proportion amplifier circuit 104 is configured to receive the amplified traveling wave signal and output an inverse amplified signal; adder circuit 105 is configured to receive the power frequency signal and the running harmonic signal, and amplify the signals in opposite phases, perform addition processing, and output a traveling wave signal of the traction power supply system (i.e., a traveling wave signal measurement result of the traction power supply system) after filtering the power frequency signal and the running harmonic signal.
It should be noted that, since the multiple harmonic trap circuit 102 is used to filter the power frequency signal and the operating harmonic signal in the traveling wave signal, there may be a set damage to the traveling wave signal itself (for example, filtering out a part of the traveling wave signal) in the filtering process. Therefore, in the embodiment of the present invention, the traveling wave signal after being processed by the adder circuit 105 is not directly output as the measurement result, but a certain subsequent operation is performed by using the subtractor circuit 103, the inverse proportion amplifier circuit 104 and the adder circuit 105, so that the traveling wave signal after being processed by the adder circuit 105 is used as the output result. Therefore, the traveling wave signal output by the adder circuit 105 is not identical to the traveling wave signal output by the multiple harmonic trap circuit 102, and the traveling wave signal output by the adder circuit 105 is more accurate than the trapped traveling wave signal output by the multiple harmonic trap circuit 102.
According to the traveling wave measuring circuit of the traction power supply system, provided by the embodiment of the invention, the harmonic wave is subjected to multiple wave trapping through the multiple wave trap circuit, the mode of subtracting the amplified traveling wave signals from the multiple wave trapping is realized through the subtracter circuit, the high-pass-like filtering of the large-amplitude power frequency signals and the traveling wave signals is realized, and the traveling wave signals are added with the amplified traveling wave signals in an opposite phase manner, so that the large-amplitude power frequency signals and the traveling wave signals can be accurately filtered, and the traveling wave signals of the required traction power supply system are completely and accurately provided.
Based on the foregoing embodiment, as an alternative embodiment, the traction power supply system traveling wave measurement circuit further includes: a small signal amplifying circuit 101; the output end of the small signal amplifying circuit 101 is respectively connected with the input ends of the inverse proportion amplifier circuit 104, the subtracter circuit 103 and the multiple harmonic trap circuit 102; the small-signal amplifying circuit 101 is configured to receive a traveling wave signal of a traction power supply system acquired by a current transformer, amplify the traveling wave signal, and input the obtained amplified traveling wave signal to the inverse proportion amplifier circuit 104, the subtractor circuit 103 and the multiple harmonic trap circuit 102, respectively. The embodiment of the invention adopts the small signal amplifying circuit 101 to receive the traveling wave signal of the traction power supply system acquired by the current transformer and amplify the acquired signal acquired and output and amplified.
Based on the content of the above-described embodiment, as an alternative embodiment, referring to fig. 2, the small-signal amplification circuit 101 includes: operational amplifier A1, resistor R2, resistor R3 and capacitor C1; one end of a resistor R1 is used for receiving a traveling wave signal of the traction power supply system, and the other end of the resistor R1 is connected with the non-inverting input end of the operational amplifier A1; one end of the resistor R2 is grounded, and the other end of the resistor R2 is connected with the inverting input end of the operational amplifier A1; the inverting input end of the operational amplifier A1 is connected with the output end of the operational amplifier A1 through a resistor R3, and the inverting input end of the operational amplifier A1 is also connected with the output end of the operational amplifier A1 through a capacitor C1; the output terminal of the operational amplifier A1 is connected to the input terminals of the inverse proportional amplifier circuit 104, the subtractor circuit 103, and the multiple harmonic trap circuit 102, respectively.
Specifically, the non-inverting input end of the operational amplifier A1 is connected with a resistor R1, the other end of the resistor R1 is an input end of the small signal amplifying circuit 101, the inverting input end of the operational amplifier A1 is grounded through a resistor R2, the inverting input end of the operational amplifier A1 is also connected with the output end of the operational amplifier A1 through a resistor R3 and a capacitor C1 which are connected in parallel, and the output end of the operational amplifier A1 is an output end of the small signal amplifying circuit 101.
Based on the content of the above-described embodiments, as an alternative embodiment, the multiple harmonic trap circuit 102 includes a plurality of sets of operational amplifier circuits, each set of operational amplifier circuits being configured to perform high-resistance filtering on the amplified traveling wave signal of the set frequency; each set of operational amplifier circuits includes: operational amplifier A2, resistor R4, resistor R5, resistor R6, capacitor C2, capacitor C3 and capacitor C4; one end of a capacitor C2 is used for receiving the amplified traveling wave signal, the other end of the capacitor C2 is connected with one end of a capacitor C3, and the other end of the capacitor C3 is connected with the non-inverting input end of the operational amplifier A2; one end of a resistor R4 is used for receiving the amplified traveling wave signal, the other end of the resistor R4 is connected with one end of a resistor R5, the other end of the resistor R5 is connected with the inverting input end of an operational amplifier A2, and the other end of the resistor R4 is grounded through a capacitor C4; the other end of the capacitor C2 is connected to the output terminal of the operational amplifier A2 through a resistor R6, the inverting input terminal of the operational amplifier A2 is connected to the output terminal of the operational amplifier A2, and the output terminal of the operational amplifier A2 is connected to the input terminal of the subtractor circuit 103.
The number of the groups of the operational amplifier circuits is not limited, and the operational amplifier circuits at least comprise two groups, so that high-resistance filtering of traveling wave signals with various specific frequencies is realized. The multiple groups of operational amplifier circuits are connected in parallel, and the input end of each group of operational amplifier circuits is used for receiving the amplified traveling wave signals or is connected with the small signal amplifying circuit 101; the output of each set of op amp circuits is connected to the input of subtractor circuit 103. Referring to fig. 2, the following description is given by taking an example in which the multiple harmonic trap circuit 102 includes two sets of operational amplifiers:
the multiple harmonic trap circuit 102 comprises an operational amplifier A2 and an operational amplifier A3 which are connected in parallel, a capacitor C3 and a resistor R5 are connected in parallel to the in-phase input end of the operational amplifier A2, the other end of the capacitor C3 is connected with the capacitor C2, the other end of the capacitor C2 is the input end of the multiple harmonic trap, the other end of the capacitor C3 is also connected with the output end of the operational amplifier A2 through a resistor R6, the other end of the resistor R5 is connected with a resistor R4, the other end of the resistor R4 is the input end of the multiple harmonic trap, the other end of the resistor R5 is also grounded through the capacitor C4, and the inverting input end of the operational amplifier A2 is connected with the output end of the operational amplifier A2.
The in-phase input end of the operational amplifier A3 is connected with a capacitor C6 and a resistor R8 in parallel, the other end of the capacitor C6 is connected with a capacitor C5, the other end of the capacitor C5 is an input end of the multiple harmonic trap, the other end of the capacitor C6 is also connected with the output end of the operational amplifier A3 through a resistor R9, the other end of the resistor R8 is connected with a resistor R7, the other end of the resistor R7 is an input end of the multiple harmonic trap, the other end of the resistor R8 is also grounded through the capacitor C7, the inverting input end of the operational amplifier A3 is connected with the output end of the operational amplifier A3, and the output end of the operational amplifier A2 and the output end of the operational amplifier A3 are connected together to jointly form the output end of the multiple harmonic trap circuit 102.
Based on the content of the above-described embodiment, as an alternative embodiment, the subtractor circuit 103 includes: operational amplifier A4, resistor R10, resistor R11, resistor R12, and resistor R13; one end of a resistor R10 is used for receiving the amplified traveling wave signal, the other end of the resistor R10 is connected with the inverting input end of the operational amplifier A4, and the other end of the resistor R10 is also connected with the output end of the operational amplifier A4 through a resistor R11; one end of a resistor R13 is used for receiving the trapped traveling wave signal, the other end of the resistor R13 is connected with the non-inverting input end of the operational amplifier A4, and the other end of the resistor R13 is grounded through a resistor R12; the output of the operational amplifier A4 is connected to the input of the adder circuit 105.
Specifically, the subtractor circuit 103 includes an operational amplifier A4, the non-inverting input terminal of the operational amplifier A4 is connected to a resistor R13, the other end of the resistor R13 is an input terminal of the subtractor circuit 103 and is connected to an output terminal of the multiple harmonic trap circuit 102, the non-inverting input terminal of the operational amplifier A4 is further grounded through a resistor R12, the inverting input terminal of the operational amplifier A4 is connected to a resistor R10 and a resistor R11, the other end of the resistor R10 is an input terminal of the subtractor circuit 103 and is connected to an output terminal of the small signal amplifying circuit 101, the other end of the resistor R11 is connected to an output terminal of the operational amplifier A4, and the output terminal of the operational amplifier A4 is an output terminal of the subtractor circuit 103.
Based on the foregoing, as an alternative embodiment, the inverse proportional amplifier circuit 104 includes: operational amplifier A5, resistor R14, resistor R15 and resistor R16; one end of a resistor R15 is used for receiving the amplified traveling wave signal, the other end of the resistor R15 is connected with the inverting input end of the operational amplifier A5, and the other end of the resistor R15 is also connected with the output end of the operational amplifier A5 through a resistor R16; one end of the resistor R14 is grounded, and the other end of the resistor R14 is connected with the non-inverting input end of the operational amplifier A4; the output of the operational amplifier A5 is connected to the input of the adder circuit 105.
Specifically, the inverse proportion amplifier circuit 104 includes an operational amplifier A5, the non-inverting input terminal of the operational amplifier A5 is grounded through a resistor R14, the inverting input terminal of the operational amplifier A5 is connected with a resistor R15, the other end of the resistor R15 is the input terminal of the inverse proportion amplifier circuit 104, the inverting input terminal of the operational amplifier A5 is also connected with the output terminal of the operational amplifier A5 through a resistor R16, and the output terminal of the operational amplifier A5 is the output terminal of the inverse proportion amplifier circuit 104.
Based on the content of the above-described embodiment, as an alternative embodiment, the adder circuit 105 includes: operational amplifier A6, resistor R17, resistor R18, resistor R19 and resistor R20; one end of a resistor R19 is used for receiving an inverse amplification signal, the other end of the resistor R19 is connected with an inverse input end of the operational amplifier A6, and the other end of the resistor R19 is also connected with an output end of the operational amplifier A6 through a resistor R20; one end of a resistor R18 is used for receiving the power frequency signal and the operation harmonic signal, and the other end of the resistor R18 is connected with the inverting input end of the operational amplifier A6; the non-inverting input end of the operational amplifier A6 is grounded through a resistor R17, and the output end of the operational amplifier A6 is used for outputting a traveling wave signal measurement result.
Specifically, the adder circuit 105 includes an operational amplifier A6, the non-inverting input terminal of the operational amplifier A6 is grounded through a resistor R17, the inverting input terminal of the operational amplifier A6 is connected to a resistor R18, the input terminal of the resistor R18 is an input terminal of the adder circuit 105 and is connected to an output terminal of the subtractor circuit 103, the inverting input terminal of the operational amplifier A6 is further connected to a resistor R19 and a resistor R20 connected in parallel, the other end of the resistor R19 is an input terminal of the adder circuit 105 and is connected to an output terminal of the inverse proportion amplifier circuit 104, the other end of the resistor R20 is connected to an output terminal of the operational amplifier A6, and the output terminal of the operational amplifier A6 is an output terminal of the adder circuit 105.
The traveling wave measuring circuit for the traction power supply system provided by the embodiment of the invention adopts a mode of subtracting the original signal from the multiple trapped waves to form high-pass filtering similar to the large-amplitude power frequency signal and the operation harmonic signal, and can accurately filter the large-amplitude power frequency signal and the operation harmonic signal through inverse proportion addition with the original signal, thereby completely extracting the required traveling wave signal of the traction power supply system.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A traction power supply system traveling wave measurement circuit, comprising: a multiple harmonic trap circuit, an inverse proportion amplifier circuit, a subtractor circuit and an adder circuit; the output end of the multiple harmonic trap circuit is connected with the input end of the subtracter circuit, and the output end of the subtracter circuit and the output end of the inverse proportion amplifier circuit are respectively connected with the input end of the adder circuit;
the multi-harmonic trap circuit is used for receiving the amplified traveling wave signals of the traction power supply system, performing high-resistance filtering on power frequency signals and operation harmonic signals in the amplified traveling wave signals, and inputting the obtained trapped traveling wave signals to the subtractor circuit;
the subtracter circuit is used for performing difference processing on the trapped traveling wave signal and the amplified traveling wave signal, and inputting the obtained power frequency signal and the obtained operation harmonic signal into the adder circuit;
the inverse proportion amplifier circuit performs inverse processing on the amplified traveling wave signal and inputs the obtained inverse amplified signal to the adder circuit;
the adder circuit is used for carrying out summation processing on the power frequency signal, the operation harmonic signal and the reverse amplification signal, and taking a processing result as a travelling wave signal measuring result of the traction power supply system.
2. The traction power supply system traveling wave measurement circuit of claim 1, further comprising: a small signal amplifying circuit; the output end of the small signal amplifying circuit is respectively connected with the input ends of the inverse proportion amplifier circuit, the subtracter circuit and the multiple harmonic trap circuit;
the small signal amplifying circuit is used for receiving the traveling wave signals of the traction power supply system, which are acquired by the current transformer, amplifying the traveling wave signals, and respectively inputting the obtained amplified traveling wave signals to the inverse proportion amplifier circuit, the subtracter circuit and the multiple harmonic trap circuit.
3. The traction power supply system traveling wave measurement circuit according to claim 2, wherein the small signal amplification circuit includes: operational amplifier A1, resistor R2, resistor R3 and capacitor C1;
one end of the resistor R1 is used for receiving a traveling wave signal of the traction power supply system, and the other end of the resistor R1 is connected with the non-inverting input end of the operational amplifier A1;
one end of the resistor R2 is grounded, and the other end of the resistor R2 is connected with the inverting input end of the operational amplifier A1;
the inverting input end of the operational amplifier A1 is connected with the output end of the operational amplifier A1 through the resistor R3, and the inverting input end of the operational amplifier A1 is also connected with the output end of the operational amplifier A1 through the capacitor C1;
and the output end of the operational amplifier A1 is respectively connected with the input ends of the inverse proportion amplifier circuit, the subtracter circuit and the multiple harmonic trap circuit.
4. The traction power supply system traveling wave measurement circuit according to claim 1, wherein the multiple harmonic trap circuit includes a plurality of sets of operational amplifier circuits, each set of the operational amplifier circuits being configured to perform high-resistance filtering on the amplified traveling wave signal at a set frequency; each set of the operational amplifier circuits includes: operational amplifier A2, resistor R4, resistor R5, resistor R6, capacitor C2, capacitor C3 and capacitor C4;
one end of the capacitor C2 is used for receiving the amplified traveling wave signal, the other end of the capacitor C2 is connected with one end of the capacitor C3, and the other end of the capacitor C3 is connected with the non-inverting input end of the operational amplifier A2;
one end of the resistor R4 is used for receiving the amplified traveling wave signal, the other end of the resistor R4 is connected with one end of the resistor R5, the other end of the resistor R5 is connected with the inverting input end of the operational amplifier A2, and the other end of the resistor R4 is grounded through the capacitor C4;
the other end of the capacitor C2 is connected with the output end of the operational amplifier A2 through the resistor R6, the inverting input end of the operational amplifier A2 is connected with the output end of the operational amplifier A2, and the output end of the operational amplifier A2 is connected with the input end of the subtracter circuit.
5. The traction power supply system traveling wave measurement circuit of claim 1, wherein the subtractor circuit comprises: operational amplifier A4, resistor R10, resistor R11, resistor R12, and resistor R13;
one end of the resistor R10 is used for receiving the amplified traveling wave signal, the other end of the resistor R10 is connected with the inverting input end of the operational amplifier A4, and the other end of the resistor R10 is also connected with the output end of the operational amplifier A4 through a resistor R11;
one end of the resistor R13 is used for receiving the trapped traveling wave signal, the other end of the resistor R13 is connected with the non-inverting input end of the operational amplifier A4, and the other end of the resistor R13 is grounded through the resistor R12;
the output end of the operational amplifier A4 is connected with the input end of the adder circuit.
6. The traction power supply system traveling wave measurement circuit of claim 1, wherein the inverse proportional amplifier circuit comprises: operational amplifier A5, resistor R14, resistor R15 and resistor R16;
one end of the resistor R15 is used for receiving the amplified traveling wave signal, the other end of the resistor R15 is connected with the inverting input end of the operational amplifier A5, and the other end of the resistor R15 is also connected with the output end of the operational amplifier A5 through a resistor R16;
one end of the resistor R14 is grounded, and the other end of the resistor R14 is connected with the non-inverting input end of the operational amplifier A4;
the output end of the operational amplifier A5 is connected with the input end of the adder circuit.
7. The traction power supply system traveling wave measurement circuit of claim 1, wherein the adder circuit comprises: operational amplifier A6, resistor R17, resistor R18, resistor R19 and resistor R20;
one end of the resistor R19 is used for receiving the inverse amplifying signal, the other end of the resistor R19 is connected with the inverse input end of the operational amplifier A6, and the other end of the resistor R19 is also connected with the output end of the operational amplifier A6 through a resistor R20;
one end of the resistor R18 is used for receiving the power frequency signal and the operation harmonic signal, and the other end of the resistor R18 is connected with the inverting input end of the operational amplifier A6;
the non-inverting input end of the operational amplifier A6 is grounded through the resistor R17, and the output end of the operational amplifier A6 is used for outputting the travelling wave signal measurement result.
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