CN206460083U - A kind of numerical control variable frequency test power device tested for large ground network - Google Patents
A kind of numerical control variable frequency test power device tested for large ground network Download PDFInfo
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- CN206460083U CN206460083U CN201720150624.0U CN201720150624U CN206460083U CN 206460083 U CN206460083 U CN 206460083U CN 201720150624 U CN201720150624 U CN 201720150624U CN 206460083 U CN206460083 U CN 206460083U
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Abstract
The utility model provides a kind of numerical control variable frequency test power device tested for large ground network, it can be tested for ground grid parameter and stable test current is provided, good measuring accuracy is effectively ensured, technical scheme includes three phase rectifier module, inverter and voltage x current sampling module, also include intermediate frequency boosting isolation module, intermediate frequency rectification module, PWM bridge type return modules, LC filtration modules, the three phase rectifier module input connects three-phase 380VAC DC voltages, output end connects inverter input terminal, the intermediate frequency boosting isolation module input connection inverter output end, output end connects intermediate frequency rectification module input, the PWM bridge type returns module input connects intermediate frequency rectification module output end, PWM bridge type return modules output end connects LC filtration module inputs, the LC filtration modules output end connects voltage x current sampling module input.
Description
Technical field
The utility model is related to ground grid parameter testing field, specially a kind of numerical control variable frequency examination tested for large ground network
Electrical verification source device.
Background technology
Ground grid parameter is tested, it is general use close to power frequency alien frequencies test current (near power frequency test frequency for
40Hz~65Hz) tested, and application Digital Signal Analysis and filtering technique etc., effectively eliminate interference signal (including work
Frequently, the composition such as harmonic wave, high frequency and DC component) to obtain alien frequencies test signal, so as to substantially increase ground grid parameter test
Precision.Ground grid parameter is measured using alien frequencies method, traditional " power current method " is fundamentally solved and is difficult to eliminate Hz noise
The problem of influence, using the test frequency close to power frequency 50Hz, alien frequencies test current diffusing situation and power current in ground
Diffusing situation is extremely approached, and institute's frequency measurement point average value can be considered the power frequency characterisitic parameter of earth mat.
The combined test power supply constituted using alien frequencies power supply and isolating transformer general at present.Shortcoming：
1st, volume is big, weight weight, it has not been convenient to onsite application；
2nd, test current stability is bad, is especially surveyed in the electric potential gradient and diverting coefficient of (often 4h~8h) for a long time
During examination, its stability directly affects measuring accuracy.
Utility model content
The utility model provides a kind of numerical control variable frequency test power device tested for large ground network, can be earth mat
Parameter testing provides stable test current, and good measuring accuracy is effectively ensured.
The technical solution of the utility model is：Including three phase rectifier module, inverter and voltage x current sampling module, also
Including intermediate frequency boosting isolation module, intermediate frequency rectification module, PWM bridge type returns module, LC filtration modules, the three phase rectifier module
Input connects three-phase 380VAC DC voltages, output end connection inverter input terminal, the intermediate frequency boosting isolation module input
End connection inverter output end, output end connection intermediate frequency rectification module input, the PWM bridge type returns module input connection
Intermediate frequency rectification module output end, PWM bridge type return modules output end connection LC filtration module inputs, the LC filtration modules are defeated
Go out end connection voltage x current sampling module input.
It is used as the preferred of such scheme, in addition to DSP digital processing units and signal condition amplification module, the signal condition
Amplification module input connects voltage x current sampling module, output end connection DSP digital processing units, the connection of DSP digital processing units
Communication interface is connected with PWM bridge type return modules, the DSP digital processing units.
As the preferred of such scheme, include on the DSP digital processing units AD conversion unit, PWM control units and
RS232 interfaces, the signal condition amplification module connects AD conversion unit, and PWM control units are connected by PWM drive modules
PWM bridge type return modules, the communication interface is connected with RS232 interfaces.
The beneficial effects of the utility model are：
1st, the volume and weight of said apparatus is small, convenient to install and transport；
2nd, electrical isolation and boosting are carried out in Mid Frequency, it is to avoid isolated using transformer in last output par, c,
Boosting, reduces volume and weight；
3rd, due to using voltage and current Real-time Feedback, CPU adjusts pwm signal width in time, to control reality output electricity
Press (or electric current) stable in programmed values, it is ensured that test voltage (or electric current) has good stability, so as to greatly improve
The precision of ground grid parameter test.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the waveform diagram of major loop passage each unit module in Fig. 1
Embodiment
Embodiment of the present utility model is described in detail below in conjunction with accompanying drawing.
As illustrated, the structure of the present embodiment includes three phase rectifier module 1, inverter 2 and voltage x current sampling module 7,
Also include intermediate frequency boosting isolation module 3, intermediate frequency rectification module 4, PWM bridge type returns module 5, LC filtration modules 6, the three-phase is whole
The input of flow module 1 connects three-phase 380VAC DC voltages, the output end connection input of inverter 2, the intermediate frequency boosting isolation
The input of module 3 connects the output end of inverter 2, the input of output end connection intermediate frequency rectification module 4, the PWM bridge type returns mould
The output end of the input of block 5 connection intermediate frequency rectification module 4, the input of the output end of PWM bridge type returns module 5 connection LC filtration modules 6,
The input of the output end of LC filtration modules 6 connection voltage x current sampling module 7.
In the present embodiment, in addition to DSP digital processing units 9 and signal condition amplification module 8, the signal condition amplification
The input of module 8 connection voltage x current sampling module 7, output end connection DSP digital processing units 9, DSP digital processing units 9 are connected
Communication interface 10 is connected with PWM bridge type returns module 5, the DSP digital processing units 9.
In the present embodiment, include on the DSP digital processing units 9 AD conversion unit 12, PWM control units 13 and
RS232 interfaces 11, the connection AD conversion of signal condition amplification module 8 unit 12, PWM control units 13 drive mould by PWM
The connection PWM bridge type returns of block 14 module 5, the communication interface 10 is connected with RS232 interfaces 11.
In said apparatus, the effect of each part is as follows：
Three phase rectifier module 1：By the three-phase 380VAC DC voltages of input, rectification is 540VDC DC voltages.
Inverter 2：By the midfrequent AC voltage that the inversion of 540VDC DC voltages is 40kHz.
Intermediate frequency boosting isolation module 3：By intermediate-frequency transformer, voltage rise and electrical isolation are completed.
Intermediate frequency rectification module 4：The alternating voltage that will be boosted and isolate, rectification is 1500VDC DC voltages.
PWM bridge type returns module 5：Receive the pwm signal of DSP digital processing units 9,1500VDC DC voltages pass through
Mixing voltages of the 40kHz modulation copped wave for the variable-frequency power sources frequency content comprising needed for.
LC filtration modules 6：Modulated signal to 40kHz is filtered processing, variable-frequency power sources frequency content needed for obtaining
Voltage.
Voltage x current sampling module 7：Voltage, electric current to output signal carry out isolation sampling.
Signal condition amplification module 8：Signal condition is carried out to voltage, current sampling signal, DSP digital processing units are output to
9 A/D conversion portions.
DSP digital processing units 9：
(1) pwm control signal is exported, frequency, the modulation output of amplitude signal is completed.
(2) receive voltage, current feedback signal, carry out A/D conversions, be compared, transported by PID/feedback with desired value
Calculate, obtain pwm control signal, by PWM isolation drives loop, be output to PWM bridge type returns, complete voltage stabilizing or the current stabilization of output
Be precisely controlled, and overvoltage, excessively stream, overheat, short circuit etc. protection and signal designation.
Communication interface 10：By communication port, receive the instruction that is set and controlled of outer computer, and export the system
Status signal.
The operation principle of the present embodiment is described below：
Host computer is by communication interface 10, and to the incoming frequency of present apparatus DSP digital processing units 9, working method, (voltage stabilizing is steady
Stream), output parameter (voltage or current effective value) etc., the present embodiment setting working frequency 40Hz, working method is current stabilization mode,
Current stabilization exports 10A.
Three phase rectifier module 1 is by the three-phase 380VAC DC voltages of input, and rectification is 540VDC DC voltages.Then pass through
Inverter 2 by the inversion of 540VDC DC voltages be 40kHz midfrequent AC voltage, index 40kHz, 380VAC.Pass through intermediate frequency liter
The intermediate-frequency transformer of isolation module 3 is pressed, voltage rise and electrical isolation, input 380V, output 1100V, frequency 40kH is completed.
Intermediate frequency rectifying part：The alternating voltage that will be boosted and isolate, rectification is 1500VDC DC voltages.
PWM bridge type returns：Receive the pwm signal of DSP digital processing units 9, by 1500VDC DC voltages, pass through 40kHz's
Mixing voltages of the copped wave for the variable-frequency power sources frequency content comprising needed for are modulated, the intermediate frequency of low frequency signal and 40kHz containing 40Hz is carried
Ripple signal.
LC filtration modules 6 are filtered processing to 40kHz modulated signal, obtain the voltage of 40Hz frequencies, voltage x current
Sampling module 7 carries out isolation sampling to voltage, the electric current of output signal.
Signal condition amplification module 8 carries out signal condition to voltage, current sampling signal, is output to DSP digital processing units
9.DSP digital processing units 9 are compared analysis to fed-back current signals and output pwm signal, readjust output PWM control letters
Number, complete to control the current stabilization of output current.
The other status signals of DSP digital processing units 9 simultaneously to the present apparatus, carry out sampling processing, anti-to outside control CPU
Feedback output, and externally exported by the indicator lamp of oneself.
In the present embodiment it should be noted that inverter 2, signal condition amplification module 8 described in the present embodiment,
DSP digital processing units 9 and PWM drive modules 14 can use prior art, be the common knowledge of those skilled in the art, therefore
Its internal structure and electrical connection are not described.
Preferred embodiment of the present utility model is these are only, the utility model is not limited to, for this area
Technical staff for, the utility model can have various modifications and variations.It is all it is of the present utility model spirit and principle within,
Any modification, equivalent substitution and improvements made etc., should be included within protection domain of the present utility model.
Claims (3)
1. a kind of numerical control variable frequency test power device tested for large ground network, including three phase rectifier module, inverter and electricity
Current voltage sampling module, it is characterised in that：Also include intermediate frequency boosting isolation module, intermediate frequency rectification module, PWM bridge type return moulds
Block, LC filtration modules, the three phase rectifier module input connect three-phase 380VAC DC voltages, and output end connection inverter is defeated
Enter end, the intermediate frequency boosting isolation module input connection inverter output end, output end connects intermediate frequency rectification module input,
The PWM bridge type returns module input connects intermediate frequency rectification module output end, the connection LC filters of PWM bridge type return modules output end
Ripple module input, the LC filtration modules output end connects voltage x current sampling module input.
2. the numerical control variable frequency test power device according to claim 1 tested for large ground network, it is characterised in that：Also
Including DSP digital processing units and signal condition amplification module, the signal condition amplification module input connection voltage x current takes
At egf block, output end connection DSP digital processing units, DSP digital processing units connection PWM bridge type return modules, the DSP numerals
Communication interface is connected with reason device.
3. the numerical control variable frequency test power device according to claim 2 tested for large ground network, it is characterised in that：Institute
State and include AD conversion unit, PWM control units and RS232 interfaces on DSP digital processing units, the signal condition amplification module
Connect AD conversion unit, PWM control units by PWM drive modules connect PWM bridge type return modules, the communication interface with
RS232 interfaces are connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720150624.0U CN206460083U (en) | 2017-02-20 | 2017-02-20 | A kind of numerical control variable frequency test power device tested for large ground network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720150624.0U CN206460083U (en) | 2017-02-20 | 2017-02-20 | A kind of numerical control variable frequency test power device tested for large ground network |
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| CN206460083U true CN206460083U (en) | 2017-09-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112362942A (en) * | 2020-10-20 | 2021-02-12 | 国网湖北省电力有限公司电力科学研究院 | Rail transit feed current measuring method based on shunt coefficient |
-
2017
- 2017-02-20 CN CN201720150624.0U patent/CN206460083U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112362942A (en) * | 2020-10-20 | 2021-02-12 | 国网湖北省电力有限公司电力科学研究院 | Rail transit feed current measuring method based on shunt coefficient |
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