CN110297123A - Series compensation device out-of-balance current test macro - Google Patents
Series compensation device out-of-balance current test macro Download PDFInfo
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- CN110297123A CN110297123A CN201910667230.6A CN201910667230A CN110297123A CN 110297123 A CN110297123 A CN 110297123A CN 201910667230 A CN201910667230 A CN 201910667230A CN 110297123 A CN110297123 A CN 110297123A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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Abstract
The invention discloses a kind of series compensation device out-of-balance current test macros, including out-of-balance current acquisition module, capacitor group total current acquisition module, capacitor group both end voltage acquisition module, signal output module and digital control board, the out-of-balance current acquisition module is connect with the signal input part of the digital control board, for acquiring the out-of-balance current of series compensation device；The signal output end of the capacitor group total current acquisition module is connect with the signal input part of the digital control board, for acquiring the total load input current of capacitor group in series compensation device；The signal input part of the capacitor group both end voltage acquisition module is connect with the signal input part of the digital control board, for acquiring the input voltage at series compensation device capacitor group both ends；The signal output module is connect with the signal output end of the digital control board, for exporting control signal.The system has the advantages that test accuracy vdiverse in function is high.
Description
Technical field
The present invention relates to current testing device technical field more particularly to a kind of series compensation device out-of-balance current test systems
System.
Background technique
The compensation that line reactance is realized with capacitor series connection complementary technology, can be improved the transmission power limit, effectively
Improve ac transmission ability.In series compensation device, the defect or failure of single or multiple capacity cells may cause other electricity
Hold element voltage to increase, in turn results in large area damage, jeopardize the safe and stable operation of series capacitor compensation group.Currently, general logical
The measurement to capacitance and its variable quantity between series capacitor compensation group different branch is crossed, realizes capacitor group internal flaw or event
The on-line checking of barrier.Work as capacitor therefore, it is difficult to measure the actual capacity of capacitor vulnerable to interference effect when due to measurement capacitance
When internal element ageing failure occurs and needs replacing, test, the control of out-of-balance current become a complicated problem.
As shown in Figure 1, compensator with series capaci tance widely applied in the power system generally comprises string benefit electricity at present
The equipment such as container group, serial compensation capacitance group protective device composition.Series capacitor compensation group passes through series-parallel mode group by capacity cell
At.Serial compensation capacitance group protective device generally comprises Metal Oxide Varistor, discharging gap, by-pass switch etc..Capacity cell
Defect or failure occur generally two class situations, first is that the fuse failure inside capacity cell, second is that capacity cell is breakdown.Electricity
Defect or failure, which occurs, in appearance element will directly result in the change of compensator with series capaci tance capacitance.
Referring to Fig. 1, in order to realize the on-line checking of compensator with series capaci tance electric capacitance change amount, series capacitor compensation group quilt
It is designed as electric bridge form.Series capacitor compensation group is generally divided into tetra- part C1-C4, is respectively arranged in four bridge arms of electric bridge,
High precision current transformer CT is arranged in the galvanometer position of bridge circuit.Under ideal normal operating condition, four bridge arms
Capacitance is equal, and electric bridge is in balance condition, and the current value of Current Transmit output should be zero.It is lacked in capacity cell
When sunken or failure, the capacitance of four bridge arms is no longer symmetrical, and Current Transmit exports certain current value.It must be pointed out
It is that under actual working environment, even if compensator with series capaci tance capacitor works normally, Current Transmit also has smaller
Output.This is because capacity cell can not accomplish strict conformance in process of production, inevitably there is electric bridge bridge arm electricity
The asymmetric situation of capacity.Therefore, reasonable threshold value need to be arranged in series compensation device out-of-balance current test platform, avoid out-of-balance current
The false alarm of detection.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of measurement accurate series compensation device out-of-balance current test systems
System.
In order to solve the above technical problems, the technical solution used in the present invention is: a kind of series compensation device out-of-balance current is surveyed
Test system, it is characterised in that: including out-of-balance current acquisition module, capacitor group total current acquisition module, capacitor group both ends
Voltage acquisition module, signal output module and digital control board, the out-of-balance current acquisition module with it is described digital control
The signal input part of plate connects, for acquiring the out-of-balance current of series compensation device；The capacitor group total current acquisition module
Signal output end is connect with the signal input part of the digital control board, for acquiring the total load of capacitor group in series compensation device
Input current；The signal input part of the capacitor group both end voltage acquisition module and the signal input part of the digital control board
Connection, for acquiring the input voltage at series compensation device capacitor group both ends；The signal output module and the digital control board
Signal output end connection, for export control signal；The digital control board is used to be controlled according to the delivering of acquisition and order
It enables.
A further technical solution lies in: the out-of-balance current acquisition module includes the first Current Voltage conversion module,
The signal output end of first Current Voltage conversion module is connect with the first signal condition with the signal input part of amplification filter module,
First signal condition is connect with the output end of amplification filter module with the signal input part of the first A/D high speed acquisition module,
The first A/D high speed acquisition module is bi-directionally connected with the first signal isolation module, the first signal isolation module with it is described
Digital control board is bi-directionally connected.
A further technical solution lies in: the capacitor group total current acquisition module includes the second Current Voltage modulus of conversion
The signal output end of block, the second Current Voltage conversion module is connect with the signal input part of signal condition bandpass filter module,
The output end of the signal condition bandpass filter module is connect with the signal input part of the 2nd A/D high speed acquisition module, described
2nd A/D high speed acquisition module is bi-directionally connected with second signal isolation module, the second signal isolation module and the number
Control panel is bi-directionally connected.
A further technical solution lies in: the capacitor group both end voltage acquisition module includes that second signal is improved and put
Big filter module, the second signal conditioning and the output end of amplification filter module and the signal of the 3rd A/D high speed acquisition module
Input terminal connection；The 3rd A/D high speed acquisition module is bi-directionally connected with third signal isolation module, the third signal isolation
Module is bi-directionally connected with the digital control board.
A further technical solution lies in: the signal output module includes D/A D/A converter module, low-pass filtering module
And Switching Power Supply power amplifier module, the D/A D/A converter module are bi-directionally connected with the digital control board, the D/A
The output end of D/A converter module is connect with the signal input part of the low-pass filtering module, the output of the low-pass filtering module
End is connect with the input terminal of the Switching Power Supply power amplifier module, and the output end of the Switching Power Supply power amplifier module is institute
State the control signal output of signal output module.
Preferred: the digital control board uses DSP as microprocessor.
A further technical solution lies in: the signal condition bandpass filtering modules block includes capacitor C47, the capacitor C47
One end be divided into two-way, the first via is the input terminal of the filter module, and another way is divided into two-way, the first via after resistance R25
It is grounded through capacitor C48, the second tunnel is connect with one end of resistance R27, the other end ground connection of the capacitor C47, the resistance R27's
The other end is the signal output end of the filter module.
Preferred: the A/D high speed acquisition module uses AD73360L type high speed acquisition chip.
The beneficial effects of adopting the technical scheme are that the system has out-of-balance current, capacitor group
Total current, three conditionings of series capacitor compensation group voltage signal and acquisition channel, are also equipped with and are greater than for the output electric current of test
2A exports the output channel of maximum amplitude 60V, easy to use, and test accuracy is high.
Detailed description of the invention
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is series capacitor compensation group and out-of-balance current test schematic in the prior art；
Fig. 2 is the functional block diagram of system described in the embodiment of the present invention；
Fig. 3 is the schematic diagram of signal condition bandpass filtering modules block in system described in the embodiment of the present invention；
Fig. 4 is the schematic diagram of system high speed synchronous data collection module described in the embodiment of the present invention；
Fig. 5 is the test schematic of system described in the embodiment of the present invention.
Specific embodiment
With reference to the attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Ground description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, but the present invention can be with
Implemented using other than the one described here other way, those skilled in the art can be without prejudice to intension of the present invention
In the case of do similar popularization, therefore the present invention is not limited by the specific embodiments disclosed below.
In order to realize the online accurate measurement of out-of-balance current, out-of-balance current, capacitor can be acquired and analyze by devising
The series compensation device out-of-balance current test platform of device group total current, series capacitor compensation group voltage, hardware frame are as shown in Figure 2.
Series compensation device out-of-balance current test platform is acquired signal processing using digital signal processor DSP, and can
To receive the control signal of host computer offer by network interface and host computer progress will be uploaded to after acquisition signal progress calculation processing
Display.
The signal acquisition of series compensation device out-of-balance current test platform mainly includes 3 channels, is respectively completed uneven electricity
The conditioning and acquisition of stream, capacitor group total current, series capacitor compensation group voltage signal.Wherein, out-of-balance current (50uA-5mA)
It is current acquisition channel with capacitor group total current (50mA-5A), is configured with Current Voltage conversion module and realizes current signal
Conversion to voltage signal.The signal of three signal sampling channels is sent into 16 A/D high speed acquisition moulds after bandpass filtering amplifies
Block gives signal processing unit DSP by signal isolation unit transportation after discrete sampling.
The signal output channels of series compensation device out-of-balance current test platform are made of numerical portion and power section.Wherein
Numerical portion exports small signal using D/A, by being sent into power section after low-pass filtering module.Power section, by Switching Power Supply
Power supply reduces weight of equipment, while can export electric current with capacitive load and be greater than 2A, export maximum amplitude 60V.
As shown in Fig. 2, a kind of series compensation device out-of-balance current test macro, including out-of-balance current acquisition module, capacitor
Device group total current acquisition module, capacitor group both end voltage acquisition module, signal output module and digital control board, it is described not
Balanced balanced current acquisition module is connect with the signal input part of the digital control board, for acquiring the imbalance electricity of series compensation device
Stream；The signal output end of the capacitor group total current acquisition module is connect with the signal input part of the digital control board, is used
The total load input current of capacitor group in acquisition series compensation device；The signal of the capacitor group both end voltage acquisition module is defeated
Enter end to connect with the signal input part of the digital control board, for acquiring the input voltage at series compensation device capacitor group both ends；
The signal output module is connect with the signal output end of the digital control board, for exporting control signal；The number control
Making sheet is used for the delivering control command according to acquisition.
It is further as shown in Figure 2: the out-of-balance current acquisition module includes the first Current Voltage conversion module, first
The signal output end of Current Voltage conversion module is connect with the first signal condition with the signal input part of amplification filter module, described
First signal condition is connect with the output end of amplification filter module with the signal input part of the first A/D high speed acquisition module, described
First A/D high speed acquisition module is bi-directionally connected with the first signal isolation module, the first signal isolation module and the number
Control panel is bi-directionally connected.
Further as shown in Figure 2: the capacitor group total current acquisition module includes the second Current Voltage conversion module,
The signal output end of second Current Voltage conversion module is connect with the signal input part of signal condition bandpass filter module, described
The output end of signal condition bandpass filter module is connect with the signal input part of the 2nd A/D high speed acquisition module, and described second
A/D high speed acquisition module is bi-directionally connected with second signal isolation module, the second signal isolation module with it is described digital control
Plate is bi-directionally connected.
Further as shown in Figure 2: the capacitor group both end voltage acquisition module includes second signal conditioning and amplification
Filter module, the second signal conditioning and the output end of amplification filter module and the signal of the 3rd A/D high speed acquisition module are defeated
Enter end connection；The 3rd A/D high speed acquisition module is bi-directionally connected with third signal isolation module, the third signal isolation mould
Block is bi-directionally connected with the digital control board.
It is further as shown in Figure 2: the signal output module include D/A D/A converter module, low-pass filtering module with
And Switching Power Supply power amplifier module, the D/A D/A converter module are bi-directionally connected with the digital control board, the D/A number
The output end of mould conversion module is connect with the signal input part of the low-pass filtering module, the output end of the low-pass filtering module
It is connect with the input terminal of the Switching Power Supply power amplifier module, the output end of the Switching Power Supply power amplifier module is described
The control signal output of signal output module.
Fig. 3 is participated in, the filter of series compensation device out-of-balance current test platform acquisition channel uses Anti-aliasing Filter Circuits,
The circuit is made of a shunt capacitance (C47) and a low pass anti-aliasing filter (R25, C48), wherein capacitor filter in parallel
Depolarization High-frequency Interference, filter constitute RC passive filter circuit, filter out High-frequency Interference, be then delivered to A/D high speed acquisition chip.
Further, the signal condition bandpass filtering modules block includes capacitor C47, and one end of the capacitor C47 is divided into two-way, the first via
For the input terminal of the filter module, another way is divided into two-way after resistance R25, and the first via is grounded through capacitor C48, the second tunnel with
One end of resistance R27 connects, and the other end ground connection of the capacitor C47, the other end of the resistance R27 is the filter module
Signal output end.
Referring to fig. 4, the A/D high speed acquisition chip that the system design uses aims at high-speed synchronous data for ADI company
Acquisition system design 16 chip AD73360L of low-power consumption, sample frequency can by programming set, can provide 8kHz,
The sample frequency of 16kHz, 32kHz and highest 64kHz.Voltage signal after AD73360L improves three channels is converted into number
Signal, and the sampled data in each channel is sent by DSP by SPI serial ports and photoelectric isolation module.Series compensation device out-of-balance current
Test platform selects 16 fixed-point calculation chip TMS320VC5502 of TI company as signal processing unit, and dominant frequency is set as
300MHz.Compared with the C54x series of digital signals that dominant frequency is 120MHz handles chip, the performance of TMS320VC5502 is about mentioned
It is 5 times high, and lower power consumption is 1/6.
Referring to Fig. 5, the test platform of the system design can receive control by wireless WiFi or fiber optic Ethernet
The control signal of acquisition module exports sine voltage signal, square-wave signal, and is transmitted by wireless WiFi or fiber optic Ethernet
Give control acquisition module.Certain route series compensation device out-of-balance current is tested with platform designed by this paper, is surveyed respectively
It has tried capacitor under operating status and has adjusted forward and backward string out-of-balance current, the results are shown in Table 1.
Capacitor adjusts forward and backward string out-of-balance current under 1 operating status of table
| Date | Condition | Phase sequence | Out-of-balance current/mA |
| 2018-4-25 | Before adjustment | A | 59.45 |
| B | 71.25 | ||
| C | 334.48 | ||
| 2018-4-25 | After adjustment | A | -48.51 |
| B | -34.49 | ||
| C | -39.89 | ||
| 2018-5-17 | Before adjustment | A | 65.76 |
| B | 54.80 | ||
| C | 416.54 | ||
| 2018-5-17 | After adjustment | A | -66.91 |
| B | -57.49 | ||
| C | -49.38 |
The system has out-of-balance current, capacitor group total current, three of series capacitor compensation group voltage signal conditionings and adopts
Collect channel, be also equipped with and be greater than 2A for the output electric current of test, exports the output channel of maximum amplitude 60V, it is easy to use, and survey
It is high to try accuracy.
Claims (8)
1. a kind of series compensation device out-of-balance current test macro, it is characterised in that: including out-of-balance current acquisition module, capacitor
Group total current acquisition module, capacitor group both end voltage acquisition module, signal output module and digital control board, the injustice
Weighing apparatus current acquisition module is connect with the signal input part of the digital control board, for acquiring the out-of-balance current of series compensation device；
The signal output end of the capacitor group total current acquisition module is connect with the signal input part of the digital control board, for adopting
Collect the total load input current of capacitor group in series compensation device；The signal input part of the capacitor group both end voltage acquisition module
It is connect with the signal input part of the digital control board, for acquiring the input voltage at series compensation device capacitor group both ends；It is described
Signal output module is connect with the signal output end of the digital control board, for exporting control signal；The digital control board
For the delivering control command according to acquisition.
2. series compensation device out-of-balance current test macro as described in claim 1, it is characterised in that: the out-of-balance current is adopted
Collecting module includes the first Current Voltage conversion module, the signal output end and the first signal condition of the first Current Voltage conversion module
It is connect with the signal input part of amplification filter module, the output end and the first A/ of first signal condition and amplification filter module
The signal input part of D high speed acquisition module connects, the first A/D high speed acquisition module and the first two-way company of signal isolation module
It connects, the first signal isolation module is bi-directionally connected with the digital control board.
3. series compensation device out-of-balance current test macro as described in claim 1, it is characterised in that: the capacitor group is always electric
Flowing acquisition module includes the second Current Voltage conversion module, the signal output end and signal condition of the second Current Voltage conversion module
The signal input part of bandpass filter module connects, the output end and the 2nd A/D high of the signal condition bandpass filter module
The signal input part of fast acquisition module connects, and the 2nd A/D high speed acquisition module is bi-directionally connected with second signal isolation module,
The second signal isolation module is bi-directionally connected with the digital control board.
4. series compensation device out-of-balance current test macro as described in claim 1, it is characterised in that: capacitor group both ends
Voltage acquisition module includes second signal conditioning and amplification filter module, and the second signal conditioning is defeated with amplification filter module
Outlet is connect with the signal input part of the 3rd A/D high speed acquisition module；The 3rd A/D high speed acquisition module and third signal every
It is bi-directionally connected from module, the third signal isolation module is bi-directionally connected with the digital control board.
5. series compensation device out-of-balance current test macro as described in claim 1, it is characterised in that: the signal output module
Including D/A D/A converter module, low-pass filtering module and Switching Power Supply power amplifier module, the D/A D/A converter module
It is bi-directionally connected with the digital control board, the output end of the D/A D/A converter module and the signal of the low-pass filtering module
Input terminal connection, the output end of the low-pass filtering module are connect with the input terminal of the Switching Power Supply power amplifier module, institute
The output end for stating Switching Power Supply power amplifier module is the control signal output of the signal output module.
6. series compensation device out-of-balance current test macro as described in claim 1, it is characterised in that: the digital control board makes
Use DSP as microprocessor.
7. series compensation device out-of-balance current test macro as described in claim 1, it is characterised in that: the signal condition band logical
Filter module includes capacitor C47, and one end of the capacitor C47 is divided into two-way, and the first via is the input terminal of the filter module, separately
It is divided into two-way after resistance R25 all the way, the first via is grounded through capacitor C48, and the second tunnel is connect with one end of resistance R27, the electricity
Hold the other end ground connection of C47, the other end of the resistance R27 is the signal output end of the filter module.
8. series compensation device out-of-balance current test macro as described in claim 1, it is characterised in that: the A/D high speed acquisition
Module uses AD73360L type high speed acquisition chip.
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| CN201910667230.6A CN110297123B (en) | 2019-07-23 | 2019-07-23 | Unbalanced current test system of series compensation device |
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