CN201819950U - Voltage sag detecting device based on synchronous digital phase shifting - Google Patents
Voltage sag detecting device based on synchronous digital phase shifting Download PDFInfo
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- CN201819950U CN201819950U CN2010202971943U CN201020297194U CN201819950U CN 201819950 U CN201819950 U CN 201819950U CN 2010202971943 U CN2010202971943 U CN 2010202971943U CN 201020297194 U CN201020297194 U CN 201020297194U CN 201819950 U CN201819950 U CN 201819950U
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Abstract
The utility model relates to a voltage sag detecting device which can adapt to complex conditions of a grid, is cheap in price and good in effect, and is applicable to large-scale promotion. Aiming at achieving the purpose, the voltage sag detecting device based on synchronous digital phase shifting comprises a voltage transformer, a signal conditioning circuit, an A/D (analog/digital) conversion circuit, a single chip microcomputer system, an RS (radio station) 232-to-USB (universal serial bus) communication module and a PC (personal computer). Due to the adoption of the technical scheme, in the voltage sag detecting device based on synchronous digital phase shifting, data amount adopted by a voltage sag detecting method based on synchronous digital phase shifting is less, the real-time performance is better, and the accuracy of the detected voltage sag amplitude and the duration is high. In the system, the good detecting accuracy can be obtained under the condition with disturbance of system frequency.
Description
Technical field
The utility model relates to power domain, electric voltage temporary drop detecting method and pick-up unit in the quality of power supply.
Background technology
Development along with the modern science and technology technology, responsive power electronic equipment widespread use and novel electric power load develop rapidly, increasing commercial production such as semiconductor manufacturing, textile industry, paper-making industry, computer integrated manufacturing system etc. more depend on the quality of power supply that electric system provides, power quality problem also receives publicity day by day, and wherein outstanding is exactly the voltage dip problem.Voltage dip is meant that its duration is generally half power frequency period to the several seconds in instantaneous 10%～90% scope that is reduced to ratings of electrical network voltage effective value (RMS) when system frequency.The U.S. reaches more than 200 hundred million dollars because of voltage dip causes economic loss every year, cause economic loss all more than 1,000,000 dollars in 1 voltage dip accident of American-European developed country, the relevant investigation of American-European developed country power department shows, in the customer complaint that causes by the quality of power supply, complaint＞70% that causes by voltage dip.Therefore, only consider that the detection of traditional power quality indexs such as harmonic wave, power frequency variation, three-phase imbalance, voltage deviation can not satisfy modern electric user's requirement.At present, voltage dip detects the important research problem that has become electrical technology field.
The main task that voltage dip detects is the detection of voltage magnitude, duration.Consider the work condition environment of actual electric network complexity, and the randomness and the transient state of voltage dip generation, simultaneously for guaranteeing that the voltage dip compensate control apparatus has well, compensation effect fast, the voltage dip pick-up unit must be realized adaptivity, quick and precisely.
At present, voltage dip is detected the more method that had both at home and abroad.Traditional effective value, peak value detection method real-time are relatively poor.Based on the dq0 converter technique of instantaneous reactive power, the voltage dip that can be used for three-phase circuit detects, but this method only is suitable for three-phase circuit, also simultaneously and does not consider to fall temporarily the phase hit that may occur.Can detect the characteristic quantity of single-phase voltage based on the dq converter technique, but still need 60 ° time-delay.Improved single-phase dq0 change detection method still needs to carry out α β conversion, dq conversion and filtering etc., realizes more complicated, and this class all needs to obtain system's basic frequency based on the method for dq conversion, increases the complexity that detects.The disappearance voltage method with the difference between the instantaneous voltage of expectation and the actual instantaneous voltage as the target of falling detection temporarily, can reasonable solution real time problem, but range of decrease value accurate determines to be still the problem that this method need solve fast temporarily.In addition, wavelet technique is a kind of important method that voltage dip detects, and can obtain generation, the release time of voltage dip more exactly, but its calculation of complex, analysis result are not directly perceived.Present existing voltage dip pick-up unit, the algorithm complexity of existence, cost an arm and a leg, real-time is poor, the result shows too simple shortcoming, the engineering applicability is poor.
The utility model content
The utility model is that design a kind ofly can adapt to the electrical network complex situations, low price but effective voltage dip pick-up unit is applicable to large-scale popularization.
In order to reach described purpose, a kind of voltage dip pick-up unit based on the synchronous digital phase shift of the utility model comprises that the voltage transformer (VT), signal conditioning circuit, A/D change-over circuit, Single Chip Microcomputer (SCM) system, the RS232 that are electrically connected successively change usb communication module, PC.
Preferably: be connected to the robust phaselocked loop between signal conditioning circuit and the A/D change-over circuit, get access to real-time fundamental frequency, the gating pulse of the synchronized sampling of its output, can reduce the synchronous error of voltage dip analysis data source to the accurate strict synchronism of AD sampling realization under complex electric network environment such as power system frequency disturbance.The robust phase-locked loop systems is made of phase detector, loop filter and voltage controlled oscillator three parts, can follow the tracks of by phase adaptation, gets access to real-time fundamental frequency, the gating pulse of output AD synchronized sampling.
Preferably: the A/D change-over circuit is 12 a circuit, and it carries out synchronized sampling to the output voltage signal of signal conditioning circuit under the synchro control pulse output of robust phaselocked loop, guarantee the high precision of sampled data, high-accuracy.
Preferably: Single Chip Microcomputer (SCM) system is made of STC90C514AD single-chip microcomputer, crystal oscillator, reset circuit, the transformation result of A/D change-over circuit is gathered, is preserved, and by RS232 commentaries on classics usb communication module data are sent to PC.
Preferably: it is characterized in that: it is single-chip microcomputer 232 serial ports that RS232 changes usb communication module one side, and opposite side is the USB standard interface.RS232 commentaries on classics usb communication module is converted to the USB normal data with single-chip microcomputer RS232 serial data like this.
Owing to adopted described technical scheme, a kind of voltage dip pick-up unit of the utility model based on the synchronous digital phase shift, the data volume that the detection algorithm employing falls in synchronous digital phase-shifting voltages temporarily is few, and real-time is better, detects the amplitude of voltage dip and the accuracy height of duration.The good detection precision can still can be got by this system under the system frequency disturbed conditions.In addition, because voltage dip check and analysis result adopts the PC LCD display to show, data are abundant, effect is directly perceived.Based on the voltage dip pick-up unit of synchronous digital phase shift, better overcome algorithm complexity that present same device exists, cost an arm and a leg, real-time is poor, the result shows too simple shortcoming, has significant Technological Economy superiority.
Description of drawings
The theory of constitution block diagram of a kind of voltage dip pick-up unit based on digital phase shift of Fig. 1 the utility model.
The implementing procedure figure of a kind of voltage dip pick-up unit based on digital phase shift of Fig. 2 the utility model.
Embodiment:
As shown in Figure 1, the utility model comprises voltage transformer (VT) 1, and the output terminal of voltage transformer (VT) 1 is connected to signal conditioning circuit 2, and voltage transformer (VT) 1 has electrical isolation, characteristics that the linearity is good, realizes hypotensive effect.The output terminal of signal conditioning circuit 2 is connected to robust phaselocked loop 3, and signal conditioning circuit 2 is made of high-operational amplifier, precision resistance, filter capacitor, and voltage is adjusted to AD input range scope, and filter away high frequency noise.The output terminal of signal conditioning circuit 2 and robust phaselocked loop 3 is connected to A/D change-over circuit 4, the output terminal of A/D change-over circuit 4 is connected to Single Chip Microcomputer (SCM) system 5, Single Chip Microcomputer (SCM) system 5 output terminal change usb communication module 6 by RS232 and be connected to PC 7, voltage dip analysis package program has been installed on the PC 7, can have known by the PC device to obtain voltage dip check and analysis result.
Below in conjunction with reference to the accompanying drawings, describe embodiment of the present utility model in detail.
Fig. 2 shows the implementing procedure that the voltage dip of the synchronous digital phase shift of an embodiment of the utility model detects, and may further comprise the steps:
Step S21: by voltage transformer (VT) 1 the tested line voltage in outside is depressurized to 6V～9V alternating voltage, and voltage is adjusted to AD input range scope by signal conditioning circuit 2, and filter away high frequency noise.
Step S22: the voltage of conditioning output obtains the real-time fundamental frequency of outside input by robust phaselocked loop 3, and voltage transformer (VT) is depressurized to 6V～9V alternating voltage with the tested line voltage in outside.
Step S23: single-chip microcomputer is sampled with 128 points/all calculating samplings time, speed by real-time fundamental frequency;
Step S24: with cycle 128 points of synchronized sampling speed sampling that calculate;
Step S25: change usb communication module 6 by RS232 the single-chip microcomputer sampled data is uploaded PC 7;
The analysis package program falls in step S26:PC machine 7 working voltages temporarily, and invoke synchronous digital phase shift voltage dip detection method is calculated real-time voltage amplitude, duration.
Step S27: simultaneously the P analysis result is showed the interface, and the analysis result of section carries out data presentation such as figure, form to last analysis time.
In above-mentioned steps S26, specifically may further comprise the steps:
Step S261: extract current instantaneous voltage value u (N from the voltage synchronous sampling sequence
0);
Step S262: carry out digital phase shift
Promptly extract instantaneous voltage value u (N after 90 ° of the phase shifts from the voltage synchronous sampling sequence
0+ 32);
Step S263: according to
Calculate the estimated value A (N of current instantaneous voltage amplitude by phase-shifting method
0);
Step S264: the same step calculates A (N
0), A (N
0+ 1), A (N
0+ 2) ..., A (N
0+ 128);
Step S265: the amplitude and the duration that calculate voltage dip.
So just realized the function of the voltage dip pick-up unit of synchronous digital phase shift.
Claims (5)
1. the voltage dip pick-up unit based on the synchronous digital phase shift is characterized in that: comprise that the voltage transformer (VT) (1), signal conditioning circuit (2), A/D change-over circuit (4), Single Chip Microcomputer (SCM) system (5), the RS232 that are electrically connected successively change usb communication module (6), PC (7).
2. a kind of voltage dip pick-up unit based on the synchronous digital phase shift as claimed in claim 1 is characterized in that: also be connected with robust phaselocked loop (3) between signal conditioning circuit (2) and the A/D change-over circuit (4).
3. a kind of voltage dip pick-up unit as claimed in claim 2 based on the synchronous digital phase shift, it is characterized in that: A/D change-over circuit (4) is 12 a circuit, described A/D change-over circuit (4) carries out synchronized sampling to the output voltage signal of signal conditioning circuit (2) under the synchro control pulse output of robust phaselocked loop (3).
4. a kind of voltage dip pick-up unit as claimed in claim 1 based on the synchronous digital phase shift, it is characterized in that: Single Chip Microcomputer (SCM) system (5) is connected and composed by STC90C514AD single-chip microcomputer, crystal oscillator, reset circuit, transformation result to A/D change-over circuit (4) is gathered, is preserved, and by RS232 commentaries on classics usb communication module (6) data is sent to PC (7).
5. a kind of voltage dip pick-up unit based on the synchronous digital phase shift as claimed in claim 4 is characterized in that: it is single-chip microcomputer 232 serial ports that RS232 changes usb communication module (6) one sides, and opposite side is the USB standard interface.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202971943U CN201819950U (en) | 2010-08-17 | 2010-08-17 | Voltage sag detecting device based on synchronous digital phase shifting |
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| CN2010202971943U CN201819950U (en) | 2010-08-17 | 2010-08-17 | Voltage sag detecting device based on synchronous digital phase shifting |
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| CN201819950U true CN201819950U (en) | 2011-05-04 |
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| CN2010202971943U Expired - Fee Related CN201819950U (en) | 2010-08-17 | 2010-08-17 | Voltage sag detecting device based on synchronous digital phase shifting |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102841244A (en) * | 2012-09-19 | 2012-12-26 | 华北电力大学（保定） | Rapid detection method for abrupt change of power grid voltage |
| CN104360235A (en) * | 2014-11-19 | 2015-02-18 | 南京工程学院 | Method for positioning voltage sag source of complex power distribution network including DGs |
| CN104360145A (en) * | 2014-10-30 | 2015-02-18 | 广东电网有限责任公司东莞供电局 | Voltage sag monitoring device based on data acquisition card |
| CN105137164A (en) * | 2015-08-06 | 2015-12-09 | 江苏省电力公司苏州供电公司 | Voltage sag on-line monitoring device applied in power system |
| CN105652076A (en) * | 2014-11-26 | 2016-06-08 | 国家电网公司 | Measurement synchronization method and system for power electronic equipment |
| CN106597074A (en) * | 2016-12-13 | 2017-04-26 | 李忠 | Novel voltage sag monitoring device |
| CN113691013A (en) * | 2021-07-08 | 2021-11-23 | 平高集团有限公司 | Little electric wire netting observes and controls protection equipment |
| CN114527321A (en) * | 2022-02-24 | 2022-05-24 | 国网北京市电力公司 | Anti-transient interference voltage sag detection method and device suitable for SSTS |
-
2010
- 2010-08-17 CN CN2010202971943U patent/CN201819950U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102841244A (en) * | 2012-09-19 | 2012-12-26 | 华北电力大学（保定） | Rapid detection method for abrupt change of power grid voltage |
| CN102841244B (en) * | 2012-09-19 | 2014-10-15 | 华北电力大学（保定） | Rapid detection method for abrupt change of power grid voltage |
| CN104360145A (en) * | 2014-10-30 | 2015-02-18 | 广东电网有限责任公司东莞供电局 | Voltage sag monitoring device based on data acquisition card |
| CN104360235A (en) * | 2014-11-19 | 2015-02-18 | 南京工程学院 | Method for positioning voltage sag source of complex power distribution network including DGs |
| CN104360235B (en) * | 2014-11-19 | 2017-04-19 | 南京工程学院 | Method for positioning voltage sag source of complex power distribution network including DGs |
| CN105652076A (en) * | 2014-11-26 | 2016-06-08 | 国家电网公司 | Measurement synchronization method and system for power electronic equipment |
| CN105137164A (en) * | 2015-08-06 | 2015-12-09 | 江苏省电力公司苏州供电公司 | Voltage sag on-line monitoring device applied in power system |
| CN106597074A (en) * | 2016-12-13 | 2017-04-26 | 李忠 | Novel voltage sag monitoring device |
| CN113691013A (en) * | 2021-07-08 | 2021-11-23 | 平高集团有限公司 | Little electric wire netting observes and controls protection equipment |
| CN114527321A (en) * | 2022-02-24 | 2022-05-24 | 国网北京市电力公司 | Anti-transient interference voltage sag detection method and device suitable for SSTS |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110504 Termination date: 20120817 |