CN204389588U - A kind of digitized grid phase and frequency detecting device - Google Patents
A kind of digitized grid phase and frequency detecting device Download PDFInfo
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- CN204389588U CN204389588U CN201520090427.5U CN201520090427U CN204389588U CN 204389588 U CN204389588 U CN 204389588U CN 201520090427 U CN201520090427 U CN 201520090427U CN 204389588 U CN204389588 U CN 204389588U
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- wave filter
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Abstract
The utility model discloses a kind of digitized grid phase and frequency detecting device, comprises pick-up unit, and described pick-up unit is by sampling module, zero passage detection module, wave filter and digital phase-locked loop module composition; The input end of sampling module is connected with electrical network, the output terminal of sampling module is divided into two-way, one tunnel is connected with digital phase-locked loop module through wave filter, and a road is connected with digital phase-locked loop module through zero passage detection module, and the output terminal of digital phase-locked loop module connects follows the tracks of synchronization control module.The utility model is matched with wave filter by zero passage detection module, and by the harmonic pollution target signal filter in testing process, and device has very large phase margin, belongs to closed-loop stabilization system.
Description
Technical field
The utility model belongs to electric and electronic technical field, is specifically related to a kind of digitized grid phase and frequency detecting device.
Background technology
Various Distributed-generation equipment all will realize output current phase place and public electric wire net voltage synchronous, namely from public electric wire net voltage subtraction synchronizing signal, can export electric energy with unity power factor to public electric wire net.Therefore, distributed grid-connected inverter output current be enable to carry out tracking to line voltage well synchronous, phase place and frequency detecting are the key links.Existing phase place and frequency detecting device are by sampling to line voltage, then utilize sampled value to estimate instantaneous electric network voltage phase on synchronous coordinate system (SFR-SynchronusReference Frame).Said apparatus can obtain higher precision in the situation of line voltage no-harmonic wave pollution, but in systems in practice, the problem that harmonic pollution in electric power net brings is quite serious.
Utility model content
To be solved in the utility model is the poor problem of existing phase place and the tolerance of frequency detecting device to harmonic pollution in electric power net, provides a kind of digitized grid phase and frequency detecting device.
For solving the problem, the utility model is achieved through the following technical solutions:
A kind of digitized grid phase and frequency detecting device, comprise pick-up unit, described pick-up unit is by sampling module, zero passage detection module, wave filter and digital phase-locked loop module composition; The input end of sampling module is connected with electrical network, the output terminal of sampling module is divided into two-way, one tunnel is connected with digital phase-locked loop module through wave filter, and a road is connected with digital phase-locked loop module through zero passage detection module, and the output terminal of digital phase-locked loop module connects follows the tracks of synchronization control module.
In such scheme, described wave filter is that 4 second order digital trappers and an integration module form the wave filter that harmonic inhabitation pollutes signal.
Compared with prior art, the utility model is the phase place and frequency detecting device that build for core with zero passage detection module, wave filter and digital phase-locked loop module, wherein zero passage detection module obtains hardware zero cross signal after carrying out zero passage detection to electrical network collection signal, wave filter obtains mains voltage signal to after electrical network collection signal filtering harmonic pollution, by digital phase-locked loop, hardware zero cross signal and mains voltage signal are carried out comprehensively, final output phase information and frequency information.The utility model is matched with wave filter by zero passage detection module, and by the harmonic pollution target signal filter in testing process, and device has very large phase margin, belongs to closed-loop stabilization system.
Accompanying drawing explanation
Fig. 1 is the theory diagram of a kind of digitized grid phase and frequency detecting device.
Fig. 2 is the Bode diagram of the transport function G (z) of wave filter.
Embodiment
The digitized grid phase of one as Fig. 1 and frequency detecting device, primarily of sampling module, zero passage detection module, wave filter and digital phase-locked loop module composition.The input end of sampling module is connected with electrical network, the output terminal of sampling module is divided into two-way, one tunnel is connected with digital phase-locked loop module through wave filter, and a road is connected with digital phase-locked loop module through zero passage detection module, and the output terminal of digital phase-locked loop module connects follows the tracks of synchronization control module.Described wave filter G (z) and digital phase-locked loop module realize inside digital processing element.Wave filter G (z) is the wave filter of filtering harmonic pollution signal.The input of digital phase-locked loop module comprises filtered mains voltage signal u
gfwith hardware zero cross signal S
zc.
Sampling module obtains u from the ac bus collection signal of electrical network
net, be transported to zero passage detection module and digital processing element, after wave filter G (z) process in digital processing element, output signal u
gf.Zero cross signal S is exported from zero passage detection module
zc, zero cross signal S
zcu is outputed signal with after wave filter G (z) process
gfbe transported to digital phase-locked loop module in digital processing element as input signal to process simultaneously, obtain frequency and phase data.
Principle of work: in actual electric network, topmost harmonic pollution signal is 5,7,11 and 13 rd harmonic signal, therefore can select mechanism, by main harmonic pollution target signal filter by a kind of.Select 4 second order digital trapper G
nz () (n=1,2,3,4) and an integration module INTEGRATOR (z) form wave filter G (z) that harmonic inhabitation pollutes signal.Power network signal u
netafter digital filtering, obtain signal u
gf, by digital phase-locked loop, signal and hardware zero passage detection module output signal are carried out comprehensively, final output phase information q
owith frequency information f
o.The filter effect of wave filter G (z) as shown in Figure 2.As seen from the figure, the gain of 5,7,11 and 13 rd harmonic signal is all below-30dB, and namely main harmonic pollution signal is by filtering, and system has very large phase margin, is closed-loop stabilization system.
Claims (2)
1. digitized grid phase and a frequency detecting device, comprise pick-up unit, it is characterized in that: described pick-up unit is by sampling module, zero passage detection module, wave filter and digital phase-locked loop module composition; The input end of sampling module is connected with electrical network, the output terminal of sampling module is divided into two-way, one tunnel is connected with digital phase-locked loop module through wave filter, and a road is connected with digital phase-locked loop module through zero passage detection module, and the output terminal of digital phase-locked loop module connects follows the tracks of synchronization control module.
2. the digitized grid phase of one according to claim 1 and frequency detecting device, is characterized in that: described wave filter is that 4 second order digital trappers and an integration module form the wave filter that harmonic inhabitation pollutes signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520090427.5U CN204389588U (en) | 2015-02-09 | 2015-02-09 | A kind of digitized grid phase and frequency detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520090427.5U CN204389588U (en) | 2015-02-09 | 2015-02-09 | A kind of digitized grid phase and frequency detecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204389588U true CN204389588U (en) | 2015-06-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520090427.5U Expired - Fee Related CN204389588U (en) | 2015-02-09 | 2015-02-09 | A kind of digitized grid phase and frequency detecting device |
Country Status (1)
| Country | Link |
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| CN (1) | CN204389588U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106452120A (en) * | 2016-12-02 | 2017-02-22 | 四川英杰电气股份有限公司 | Phase-locking synchronous compensation processing method and system |
| CN107634520A (en) * | 2017-10-18 | 2018-01-26 | 深圳市赛源电气技术有限公司 | Zero cross detection circuit and capacitor compensation cabinet |
-
2015
- 2015-02-09 CN CN201520090427.5U patent/CN204389588U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106452120A (en) * | 2016-12-02 | 2017-02-22 | 四川英杰电气股份有限公司 | Phase-locking synchronous compensation processing method and system |
| CN107634520A (en) * | 2017-10-18 | 2018-01-26 | 深圳市赛源电气技术有限公司 | Zero cross detection circuit and capacitor compensation cabinet |
| CN107634520B (en) * | 2017-10-18 | 2024-08-30 | 深圳市赛源电气技术有限公司 | Zero-crossing detection circuit and capacitance compensation cabinet |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150610 Termination date: 20160209 |