CN108318744A - A kind of converter valve thyristor level damping circuit parameter test device and method - Google Patents
A kind of converter valve thyristor level damping circuit parameter test device and method Download PDFInfo
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- CN108318744A CN108318744A CN201810032547.8A CN201810032547A CN108318744A CN 108318744 A CN108318744 A CN 108318744A CN 201810032547 A CN201810032547 A CN 201810032547A CN 108318744 A CN108318744 A CN 108318744A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2605—Measuring capacitance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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Abstract
The present invention relates to a kind of converter valve thyristor level damping circuit parameter test device and methods, including control system, measuring system, current supply circuit, by the way that interface is arranged in measuring system, acquire the negative peak of sampling resistor both end voltage, the negative peak of AC supply voltage, the numerical value collected according to these, the conduction voltage drop of energy circuit backward dioded is taken in conjunction with IGBT group control panel, damping circuit parameter is calculated, it ensure that the accuracy and reliability of damping resistance and capacitance test, and apparatus structure is simple, it is cheap, safe operation is convenient.
Description
Technical field
The invention belongs to high-voltage direct-current technical field of electric power transmission, and in particular to a kind of converter valve thyristor level damping circuit ginseng
Number test device and method.
Background technology
Converter valve is the critical elements in high voltage direct current transmission project, since D.C. high voltage transmission voltage class is high, the change of current
Valve is usually made of multistage Thyristors in series.Damping circuit effect is to ensure that the voltage's distribiuting between series thyristor is uniform, by hindering
Buffer resistance and damping capacitor composition, are of great significance to the safe operation of direct current transportation.Therefore, damping circuit component parameters
Accurately test it is of crucial importance.But since single current conversion station just has thousands of a thyristor grades, when maintenance, carries out damping circuit ginseng
It is huge that number measures work.
The conventional method of change of current valve damping circuit test is mainly directly tested using multimeter, electric bridge etc., this
Kind method needs wiring being connected to damping capacitor C and the both ends damping resistance R in converter valve.Due to thyristor electronic circuit
In (Thyristor Electronic, TE plate) structure converter valve, damping capacitor C and damping resistance R are located at change of current valve group
Part both sides, wiring is inconvenient, needs multiple testing crews to coordinate, takes a significant amount of time completion.
In recent years, fractional unit also installs measuring device outlet to telescopic rod, it will when facilitating testing crew to measure
The method that wiring is connected to capacitance C and the both ends resistance R.This method is opposite with traditional test method, test speed and facilitates journey
It increases on degree.But when due to experiment, telescopic rod need to be across high-voltage connecting in thyristor, TE plates, damping resistance and valve module
Line readily accesses above equipment, causes other problems, safety poor.
Publication No. is that the Chinese patent of CN104808070A proposes a kind of damping circuit parameter test method, such as Fig. 1 institutes
Show, is by the way that the power frequency AC of 50Hz is applied to thyristor grade test product both ends, while utilization thyristor grade test product voltage
With the phase difference of electric current, to calculate damping resistance and damping capacitor, but the IGBT group being connected in damping circuit is not considered
And monitoring electronic equipment takes energy circuit.
Due to converter valve generally use overhung construction, when testing impedance, wiring is connected to damping resistance and damping capacitor
It is extremely inconvenient, test device output is connected to thyristor cathode and anode radiator is simple and easy to operate.
Invention content
To overcome above-mentioned drawback, propose that one kind both having met converter valve structure design, it is also contemplated that concatenated in damping circuit
TE plates take the test method of energy circuit, and test result is accurate, and converter valve engineering site is facilitated to implement.
The object of the present invention is to provide a kind of converter valve thyristor level damping circuit parameter test device and methods, for solving
Certainly the measurement of damping circuit parameter is inaccurate in the prior art, the unsafe problem of test equipment.
In order to solve the above technical problems, the present invention proposes a kind of converter valve thyristor level damping circuit parameter test device,
Including control system, measuring system, control system connects measuring system, further includes the power supply time for powering for thyristor grade
Road, current supply circuit are used to take energy circuit, current supply circuit to be provided with alternating current for electrical connection damping resistance, damping capacitor and TE plates
Source and sampling resistor；Measuring system is provided with the interface for measuring the sampling resistor both end voltage, for measuring the friendship
Flow the interface of supply voltage.
Further, the current supply circuit is additionally provided with isolating transformer, and AC power passes through described in the connection of isolation voltage device
Sampling resistor.
Further, the current supply circuit is additionally provided with relay.
Further, the measuring system includes sample circuit and signal conditioning circuit, and sample circuit passes through signal condition electricity
Road connects the control system, and the interface for measuring the sampling resistor both end voltage is provided in sample circuit, is used
In the interface for measuring the AC supply voltage.
Further, the control system includes DSP and display system.
In order to solve the above technical problems, the present invention also proposes a kind of converter valve thyristor level damping circuit parameter testing side
Method includes the following steps：
1) in converter valve, damping circuit is connected in parallel on thyristor both ends, and current supply circuit is provided with AC power and sampling resistor,
Two leading-out terminals of current supply circuit are respectively connected to thyristor anode and cathode, when current supply circuit applies alternating voltage, acquisition
The negative peak of sampling resistor both end voltage acquires the negative peak of AC supply voltage；
2) according to the negative sense peak of the sampling instant of the negative peak of the sampling resistor both end voltage and AC supply voltage
The difference of the sampling instant of value calculates the phase difference of current supply circuit electric current and AC supply voltage；
3) according to the negative peak of the sampling resistor both end voltage, the negative peak of AC supply voltage, in conjunction with known
TE plates take can the conduction voltage drop of backward dioded and the phase difference in circuit, damping resistance value and damping electricity is calculated
Capacitance.
Further, the current supply circuit is additionally provided with isolating transformer, and AC power passes through described in the connection of isolation voltage device
Sampling resistor；The negative peak of the AC supply voltage is the negative peak of the secondary voltage of isolating transformer.
Further, the calculating formula of phase difference described in step 2) is as follows：
δ=t*2 π/T
In formula, δ is the phase difference, and T is the sampling period, and t is adopting for the negative peak of the sampling resistor both end voltage
The difference of the sampling instant of the secondary voltage of the negative peak or isolating transformer of sample moment and AC supply voltage.
Further, the calculating formula of damping resistance described in step 3) and damping capacitor is as follows：
R=(Um-Udiode)*RL*cos(t*2π/T)/URlm-RL
C=URlm/[(Udiode-Um)*RL*sin(t*2π/T)*2πf]
In formula, R is damping resistance, and C is damping capacitor, UmFor the negative peak or isolating transformer of AC supply voltage
The negative peak of secondary voltage, RLFor sampling resistor, URlmFor the negative peak of sampling resistor both end voltage, UdiodeIt is taken for TE plates
The conduction voltage drop of backward dioded in energy circuit, f are the frequency of AC power.
Further, when the damping resistance is in the resistance range of setting, and the damping capacitor is in the capacitance model of setting
When enclosing interior, judge that the damping circuit parameter of the thyristor grade is qualified.
The beneficial effects of the invention are as follows：
The damping circuit parameter test device of the present invention is simple in structure, including control system, measuring system, current supply circuit,
By the way that interface is arranged in measuring system, the negative peak of sampling resistor both end voltage, the negative sense peak of AC supply voltage are acquired
Value takes the conduction voltage drop of backward dioded in energy circuit, and the numerical value collected according to these in conjunction with TE plates, can be calculated
Damping circuit parameter ensure that the accuracy and reliability of damping resistance and capacitance test, and apparatus structure is simple, price just
Preferably, safe operation is convenient.
Further, it is additionally provided with isolating transformer in current supply circuit of the invention, effectively high frequency spurs is inhibited to scurry into power supply
Circuit enables measuring system to collect the negative peak waveform of purer sampling resistor both end voltage, TE plates take energy electricity
The negative peak waveform of the secondary voltage of the conducting voltage waveform and isolating transformer of backward dioded, improves meter in road
Calculate the precision of damping resistance and damping capacitor.
Description of the drawings
Fig. 1 is a kind of system block diagram of damping circuit parameter test device of the prior art；
Fig. 2 is a kind of system block diagram of damping circuit parameter test device of the present invention；
Fig. 3 is that TE plates take energy circuit theory schematic diagram；
Fig. 4 is the voltage acquisition oscillogram of sampling resistor and isolating transformer；
Fig. 5 is damping circuit vector impedance figure.
Specific implementation mode
The specific implementation mode of the present invention is further described below in conjunction with the accompanying drawings.
A kind of damping circuit parameter test device of the present invention is as shown in Fig. 2, include control system, measuring system, and use
In the current supply circuit powered for thyristor grade.Wherein, control system connect measuring system, current supply circuit be provided with AC power,
Sampling resistor RL, isolating transformer and relay, one end of isolating transformer passes through that relay connects AC power, the other end connects
Connect sampling resistor；Measuring system is provided with for measuring sampling resistor RLThe interface C of the negative peak of both end voltage2, for measuring
The interface C of the negative peak of the AC supply voltage1.Thyristor grade includes thyristor VT and damping resistance R, damping electricity
Hold the damping circuit for taking energy circuit to be composed in series of C, TE plate, thyristor VT is in parallel with damping circuit.
The test method that above-mentioned damping circuit parameter test device is realized includes the following steps：
1) control AC power is applied to thyristor grade, acquires the negative peak of sampling resistor both end voltage, acquisition exchange
The negative peak of supply voltage；
2) according to the negative sense peak of the sampling instant of the negative peak of the sampling resistor both end voltage and AC supply voltage
The difference of the sampling instant of value calculates the phase difference of current supply circuit electric current and AC supply voltage；
3) according to the negative peak of sampling resistor both end voltage, the negative peak of AC supply voltage, in conjunction with known TE
Plate takes the conduction voltage drop of backward dioded and above-mentioned phase difference in energy circuit, obtains damping resistance and damping capacitor；
4) when damping resistance is in the resistance range of setting, and the damping capacitor is in the capacitance range of setting, sentence
The damping circuit parameter of the fixed thyristor grade is qualified.
The test device structural principle of the present invention is simple, by the negative peak, the exchange that acquire sampling resistor both end voltage
The negative peak of supply voltage, and the numerical value combination TE plates collected according to these take the conducting of backward dioded in energy circuit
Damping circuit parameter can be calculated in pressure drop, ensure that the accuracy and reliability of damping resistance and capacitance test, and device
Cheap, safe operation is convenient.
For the ease of testing wiring, 50Hz power frequency ACs are applied to tested thyristor grade both ends by test device.By
It is off state in thyristor, transformer secondary is equivalent to damping circuit, TE plates and sampling resistor RLSeries circuit.Such as figure
Shown in 2, when current supply circuit electric current is positive, TE plates take energy circuit to be connected serially in damping circuit；When current supply circuit electric current is negative sense,
TE plate backward diodeds are connected, and TE plates are taken can circuits bypass.The present invention using thyristor damping loop current be negative when, TE
The characteristic of plate backward dioded conducting, by measuring sampling resistor both end voltage negative peak URlm, counter circuit electric current negative sense peak
Value Im, calculating formula Im=URlm/RL.Meanwhile measuring isolating transformer secondary voltage negative peak UmAnd TE plates take in energy circuit
The conduction voltage drop U of backward diodeddiode, in conjunction with URlmAnd UmThe time difference t of generation calculates damping circuit parameter.
According to above-mentioned collected value, row take the calculating formula of impedance loop in current supply circuit：
Z=│ Z │ cos δ+j │ Z │ sin δ
│ Z │=(Um-Udiode)*RL/URlm
Z=R+RL-j/2πfC
In formula, Z is impedance loop, and │ Z │ are impedance loop amplitude, and R is damping resistance, and C is damping capacitor, and f is acquisition frequency
Rate, preferably 50Hz power frequencies, δ is the phase difference of the secondary voltage of current supply circuit electric current and isolating transformer, due to sampling resistor RL
For the noninductive sampling resistor of high-precision, phase and the sampling resistor both end voltage negative peak U of loop currentRlmPhase it is identical, because
This, the phase difference of the secondary voltage of current supply circuit electric current and isolating transformer is equal to sampling resistor both end voltage negative peak URlm
With the secondary voltage U of isolating transformermPhase difference, calculating formula is as follows：
δ=t*2 π/T
In formula, T is the sampling period, is 20ms, and t is the sampling instant of the negative peak of the sampling resistor both end voltage,
With the difference of the sampling instant of the secondary voltage of isolating transformer, as shown in Figure 5.
In conjunction with above-mentioned formula, the calculating formula of damping resistance and damping capacitor is obtained：
R=(Um-Udiode)*RL*cos(t*2π/T)/URlm-RL
C=URlm/[(Udiode-Um)*RL*sin(t*2π/T)*2πf]
In formula, UmFor the negative peak of the secondary voltage of the negative peak or isolating transformer of AC supply voltage, RLTo adopt
Sample resistance, URlmFor the negative peak of sampling resistor both end voltage, UdiodeThe conducting pressure of backward dioded in energy circuit is taken for TE plates
Drop, f are the frequency of AC power.
After calculating damping resistance and damping capacitor, according to the parameter area of setting, to judge whether test result is qualified,
And it is shown by display system.For example, damping resistance R is in the resistance range of setting, and damping capacitor C is in the electricity of setting
When holding in range, judge that the damping circuit parameter for being tested thyristor grade is qualified, if arbitrary parameter in damping resistance and damping capacitor
Not in the parameter area of setting, then it is determined as unqualified.
Easy-to-connect of the present invention, test result are accurate and reliable.Control system is handed over the power frequency of 50Hz by isolating transformer
Galvanic electricity source is applied to tested thyristor grade both ends so that TE plates take the backward dioded in energy circuit in the conduction state, measure
Loop current signals and isolating transformer secondary voltage signal, according to the negative peak of above-mentioned electric current and voltage signal, and combine
Its phase difference can calculate the numerical value of damping resistance and damping capacitor.The converter valve thyristor level damping circuit parameter of the present invention is surveyed
It is accurate and reliable that simple in structure, easy-to-connect, test result are set in trial assembly.
The foregoing is merely the preferred embodiment of the present invention, are not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.Any modification made by all within the spirits and principles of the present invention,
Equivalent replacement, improvement etc., should be included within scope of the presently claimed invention.
Claims (10)
1. a kind of converter valve thyristor level damping circuit parameter test device, including control system, measuring system, control system connects
Connect measuring system, which is characterized in that further include the current supply circuit for powering for thyristor grade, current supply circuit is used for for electrical connection
Damping resistance, damping capacitor and TE plates take can circuit, current supply circuit is provided with AC power and sampling resistor；Measuring system is set
It is equipped with the interface for measuring the sampling resistor both end voltage, the interface for measuring the AC supply voltage.
2. converter valve thyristor level damping circuit parameter test device according to claim 1, which is characterized in that the confession
Electrical circuit is additionally provided with isolating transformer, and AC power connects the sampling resistor by isolation voltage device.
3. converter valve thyristor level damping circuit parameter test device according to claim 2, which is characterized in that the confession
Electrical circuit is additionally provided with relay.
4. converter valve thyristor level damping circuit parameter test device according to claim 1, which is characterized in that the survey
Amount system includes sample circuit and signal conditioning circuit, and sample circuit connects the control system by signal conditioning circuit, adopts
The interface for measuring the sampling resistor both end voltage is provided in sample circuit, for measuring the AC supply voltage
Interface.
5. converter valve thyristor level damping circuit parameter test device according to claim 1, which is characterized in that the control
System processed includes DSP and display system.
6. a kind of converter valve thyristor level damping circuit parameter test method, which is characterized in that include the following steps：
1) current supply circuit is applied to the damping circuit both ends of concatenation, current supply circuit is provided with AC power and sampling resistor, supplies
When electrical circuit applies alternating voltage, the negative peak of sampling resistor both end voltage is acquired, the negative sense peak of AC supply voltage is acquired
Value；
2) according to the negative peak of the sampling instant of the negative peak of the sampling resistor both end voltage and AC supply voltage
The difference of sampling instant calculates the phase difference of current supply circuit electric current and AC supply voltage；
3) according to the negative peak of the sampling resistor both end voltage, the negative peak of AC supply voltage, in conjunction with known TE
Plate takes the conduction voltage drop of backward dioded and the phase difference in energy circuit, and damping resistance value and damping capacitor value is calculated.
7. converter valve thyristor level damping circuit parameter test method according to claim 6, which is characterized in that the confession
Electrical circuit is additionally provided with isolating transformer, and AC power connects the sampling resistor by isolation voltage device；The AC power
The negative peak of voltage is the negative peak of the secondary voltage of isolating transformer.
8. the converter valve thyristor level damping circuit parameter test method described according to claim 6 or 7, which is characterized in that step
It is rapid 2) described in phase difference calculating formula it is as follows：
δ=t*2 π/T
In formula, δ is the phase difference, and T is the sampling period, when t is the sampling of the negative peak of the sampling resistor both end voltage
Carve the difference of the sampling instant of the secondary voltage with the negative peak of AC supply voltage or isolating transformer.
9. converter valve thyristor level damping circuit parameter test method according to claim 8, which is characterized in that step 3)
Described in damping resistance and damping capacitor calculating formula it is as follows：
R=(Um-Udiode)*RL*cos(t*2π/T)/URlm-RL
C=URlm/[(Udiode-Um)*RL*sin(t*2π/T)*2πf]
In formula, R is damping resistance, and C is damping capacitor, UmFor the negative peak of AC supply voltage or the secondary side of isolating transformer
The negative peak of voltage, RLFor sampling resistor, URlmFor the negative peak of sampling resistor both end voltage, UdiodeBeing taken for TE plates can electricity
The conduction voltage drop of backward dioded in road, f are the frequency of AC power.
10. converter valve thyristor level damping circuit parameter test method according to claim 6, which is characterized in that work as institute
Damping resistance is stated in the resistance range of setting, and when the damping capacitor is in the capacitance range of setting, judges the brilliant lock
The damping circuit parameter of pipe grade is qualified.
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| CN201810032547.8A CN108318744B (en) | 2018-01-12 | 2018-01-12 | Converter valve thyristor-level damping loop parameter testing device and method |
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| CN201810032547.8A CN108318744B (en) | 2018-01-12 | 2018-01-12 | Converter valve thyristor-level damping loop parameter testing device and method |
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| CN108318744A true CN108318744A (en) | 2018-07-24 |
| CN108318744B CN108318744B (en) | 2020-07-07 |
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Cited By (6)
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| CN109239557A (en) * | 2018-10-26 | 2019-01-18 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of thyristor carries out the electric leakage flow calculation methodologies of pressure-resistant performance test with external circuit |
| CN112269062A (en) * | 2020-09-14 | 2021-01-26 | 中国南方电网有限责任公司超高压输电公司广州局 | Valve section module element impedance tester |
| CN112269066A (en) * | 2020-09-14 | 2021-01-26 | 中国南方电网有限责任公司超高压输电公司广州局 | Method for measuring non-disconnection parameters of core device of voltage-sharing capacitor circuit of converter valve |
| CN112505496A (en) * | 2020-11-03 | 2021-03-16 | 西安交通大学 | Thyristor real-time diagnosis and prediction method for insulation abnormity in converter valve |
| CN112630540A (en) * | 2019-09-24 | 2021-04-09 | 无锡华润矽科微电子有限公司 | Inductance quality factor measuring method, corresponding measuring circuit and application thereof |
| CN115015729A (en) * | 2022-06-30 | 2022-09-06 | 中国电力科学研究院有限公司 | Test loop, method and system for checking performance of thyristor converter valve and damping loop of thyristor converter valve |
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| CN112630540A (en) * | 2019-09-24 | 2021-04-09 | 无锡华润矽科微电子有限公司 | Inductance quality factor measuring method, corresponding measuring circuit and application thereof |
| CN112269062A (en) * | 2020-09-14 | 2021-01-26 | 中国南方电网有限责任公司超高压输电公司广州局 | Valve section module element impedance tester |
| CN112269066A (en) * | 2020-09-14 | 2021-01-26 | 中国南方电网有限责任公司超高压输电公司广州局 | Method for measuring non-disconnection parameters of core device of voltage-sharing capacitor circuit of converter valve |
| CN112269066B (en) * | 2020-09-14 | 2022-05-13 | 中国南方电网有限责任公司超高压输电公司广州局 | Method for measuring non-disconnection parameters of core device of voltage-sharing capacitor circuit of converter valve |
| CN112505496A (en) * | 2020-11-03 | 2021-03-16 | 西安交通大学 | Thyristor real-time diagnosis and prediction method for insulation abnormity in converter valve |
| CN115015729A (en) * | 2022-06-30 | 2022-09-06 | 中国电力科学研究院有限公司 | Test loop, method and system for checking performance of thyristor converter valve and damping loop of thyristor converter valve |
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