CN101854063B - Device and method for detecting power phase in energy feedback device - Google Patents
Device and method for detecting power phase in energy feedback device Download PDFInfo
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- CN101854063B CN101854063B CN 200910081162 CN200910081162A CN101854063B CN 101854063 B CN101854063 B CN 101854063B CN 200910081162 CN200910081162 CN 200910081162 CN 200910081162 A CN200910081162 A CN 200910081162A CN 101854063 B CN101854063 B CN 101854063B
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Abstract
The invention discloses a device and a method for detecting power phase in an energy feedback device. The device comprises a feedback power circuit, a feedback control circuit, a phase-shifting transformer, a low-pass filter circuit and a power phase detection circuit, wherein power network voltage is output to the low-pass filter circuit via the phase-shifting transformer, filtered by the low-pass filter circuit, sent to the power phase detection circuit and finally output to the feedback control circuit so as to control the feedback power circuit. The power phase detection device in the energy feedback device has the advantages of low cost, simple structure and good filtering effect, and ensures that detection signals has no phase shift to power fundamental wave while performing isolation, voltage reduction and filtering on power. The power phase detection method in the energy feedback device can effectively improve the work efficiency and work reliability of the energy feedback device under the circumstance that the power network voltage has distortion and enhance the adaptability of the energy feedback device to the power network voltage.
Description
Technical field
The present invention relates to a kind of power phase checkout gear and detection method, specifically, relate to power phase checkout gear and detection method in a kind of energy back feed device.
Background technology
The energy back feed device system construction that industry is used always is as shown in Figure 1; Its basic functional principle all is the phase place that control circuit passes through the detection of grid power supply; Triggering the conducting of power electronic component turn-offs; Realize that direct current flows to AC network, when current phase and electric network voltage phase difference are spent greater than 90, realized that energy is transmitted back to electrical network.
The phase-detection link is to realize the key of the correct loopback electrical network of energy, and generally, it is made up of transformer, filter and last several parts of power phase testing circuit, shown in empty frame part among Fig. 1.
Wherein transformer mainly plays the effect of isolating with step-down, generally adopts Y/Y structure or Δ/Δ structure, when guaranteeing former secondary voltage phase place unanimity supply voltage is isolated and step-down; Power electronic device copped wave produced when filter was mainly worked for the filtering feedback system interference signal and electrical network clutter; In order electrical network power-frequency voltage signal not to be produced phase shift; The filter circuit that filter adopts only carries out filtering to the above interference signal of 2KHz usually; Feedback system is under the normal situation of line voltage, and the processing procedure of mains voltage signal is as shown in Figure 2, and voltage waveform corresponds respectively to A, B, C 3 points of Fig. 1 mark; Last power phase testing circuit is through detecting the phase place that obtains line voltage through the zero crossing of the voltage signal after isolated buck and the Filtering Processing.
When serious distortion took place line voltage, voltage waveform may become the appearance shown in Fig. 3 dotted line.Because the phase shift that Harmonic Interference and filter cause makes voltage over zero change, or even is beating, t1 does not overlap (dotted line is represented the mains voltage signal that distorts and contain burr to disturb, and solid line is represented the mains voltage signal of standard) with t2.
For above-mentioned reasons, when grid voltage waveform distorts when serious, it is inaccurate that the detection method of zero crossing can cause energy back feed device that power phase is detected, and feedback device can't operate as normal.
In order to obtain the sine voltage signal of standard; Generally the parameter of filter is adjusted, carried out filtering such as the method that can adopt single order or second-order low-pass filter circuit, when low-order harmonic content is bigger; The method that increases the LPF time constant can obtain the fundamental signal of supply voltage; But can cause bigger phase shift simultaneously, detection signal can't react the true phase place of power supply, and the feedback ability of feedback device descends greatly in such cases; Even causing serious fault, wave form varies is as shown in Figure 4.
In addition, adopt the method for resonator, filter to carry out filtering to the harmonic wave of a certain frequency; For low-order harmonic, inductance parameters is bigger, and the volume heating all has problem, owing to adopted the RLC element, also causes phase shift simultaneously, and parameter matching is complicated, very flexible.
Power phase testing circuit part also can adopt digital filtering mode to achieve the goal, in Fig. 2, omit hardware filtering device link, after will directly be carried out the A/D conversion through the power supply voltage signal after the transformer step-down; Carry out fourier decomposition; Adopt digital filtering method to extract fundamental signal, also can obtain the phase signal of power supply, but digital signal processing devices such as needs employing DSP could be accomplished; Cost is high, is prone to simultaneously interference signal is introduced digital circuit.
Summary of the invention
Power phase checkout gear and detection method in a kind of energy back feed device that the present invention designs in order to solve the problems of the technologies described above just, but correct network voltage detection phase place obtained its filtering low-order harmonic the time.
The technical solution adopted for the present invention to solve the technical problems is:
Power phase checkout gear in a kind of energy back feed device comprises feedback power circuit, feedback control circuit, phase shifting transformer, low-pass filter circuit and power phase testing circuit; Line voltage (U
i) export to low-pass filter circuit through phase shifting transformer, give the power phase testing circuit after the low-pass filter circuit filtering, thereby export to feedback control circuit control feedback power circuit at last; Obtain leading phase shift through phase shifting transformer, low-pass filter circuit produces the hysteresis phase shift, through behind both composition complementaries the power supply first-harmonic not being produced phase shift.
Power phase checkout gear in said a kind of energy back feed device, its phase shifting transformer adopt the Y/ Δ to connect method, or adopt Δ/Y to connect method, through the adjustment phase sequence, can obtain leading phase π/6.
Power phase checkout gear in said a kind of energy back feed device; Its phase shifting transformer adopts former limit Y or Δ to connect method; Phase shifting transformer adopts the secondary extend-triangle to connect method; Can obtain the leading phase of different angles, leading phase is big more, and the time constant filter of low-pass filter circuit is can selectivity bigger.
Power phase checkout gear in said a kind of energy back feed device, its low-pass filter circuit carries out filtering to this signal, and through the adjustment time constant filter, it produces arbitrarily angled hysteresis phase shift to fundamental signal.
Power phase checkout gear in said a kind of energy back feed device, its low-pass filter circuit carries out filtering to this signal, and it can cause decay to harmonic wave more than three times.
Power phase checkout gear in said a kind of energy back feed device, its phase detecting circuit are relatively to obtain the supply voltage phase place through voltage zero-cross.
Power phase checkout gear in said a kind of energy back feed device, its low-pass filter circuit are the active or passive filtering of single order, or multistage active or passive filtering.
Power phase checkout gear in said a kind of energy back feed device, its phase shifting transformer and low-pass filter circuit position relation each other can exchange.
Power phase detection method in a kind of energy back feed device, its phase-detection are according to following works:
1. line voltage (the U that contains harmonic wave
i) the phase shift effect of signal through phase shifting transformer, obtain the leading voltage signal of phase place; In order to guarantee that phase shifting transformer carries out leading phase shift to voltage, can adopt circuit of testing the phase sequence that the line voltage phase sequence that inserts is detected, what guarantee access is correct phase sequence;
2. through the filter action of low-pass filter circuit, the harmonic signal more than 3 times is carried out algorithm, simultaneously the fundamental signal phase place is produced the hysteresis phase shift, the electric network voltage phase detection signal (U of final acquisition and line voltage same phase
S);
3. the power phase testing circuit obtains power phase accurately through the zero crossing of detection with the synchronous voltage signal of electrical network, offers the feedback control circuit and uses.
The invention has the beneficial effects as follows: power phase checkout gear cost is low, simple in structure in this energy back feed device, good wave filtering effect, and when power supply was realized isolation, step-down, filtering, detection signal did not produce phase shift to the power supply first-harmonic.The power phase detection method can effectively improve the operating efficiency and the functional reliability of energy back feed device in this energy back feed device, to the adaptive capacity enhancing of line voltage.
Description of drawings
Fig. 1 is the energy back feed device system block diagram.
Fig. 2 is the mains voltage signal processing procedure oscillogram under the undistorted situation of line voltage.
Fig. 3 causes zero crossing offset wave forms figure for the line voltage distortion.
Fig. 4 adopts adjustment filter parameter mode processing procedure oscillogram under the line voltage distortion situation.
Fig. 5 is the mains voltage signal processing procedure oscillogram of band phase compensation.
Fig. 6 is the electric network voltage phase detection system block diagram of band phase compensation.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
As shown in Figure 6, power phase checkout gear in a kind of energy back feed device of the present invention comprises feedback power circuit, feedback control circuit, phase shifting transformer, low-pass filter circuit and power phase testing circuit.Line voltage is exported to low-pass filter circuit through Y/ Δ phase shifting transformer, judges the line voltage phase sequence through circuit of testing the phase sequence, knows that the phase shifting transformer output phase changes; Give the power phase testing circuit after the low-pass filter circuit filtering, thereby export to feedback control circuit control feedback power circuit at last.
Power phase checkout gear in said a kind of energy back feed device, its circuit of testing the phase sequence detection of grid is as line voltage (U
i) phase sequence is correct time, phase shifting transformer makes the leading former limit π of transformer secondary output phase/6; When the line voltage phase sequence when negative, phase shifting transformer makes transformer secondary output phase former limit π/6 that lag behind.
Power phase checkout gear in said a kind of energy back feed device; The former limit of phase shifting transformer adopts Y or Δ to connect method, and secondary adopts extend-triangle to connect method, can obtain the leading phase of different angles; Leading phase is big more; The time constant filter of low-pass filter circuit is can selectivity bigger, the convenient simultaneously above filter circuit in two rank, the better effects if of adopting.
Power phase checkout gear in said a kind of energy back feed device, its low-pass filter circuit carries out filtering to this signal, and it is to fundamental signal phase shift hysteresis π/6.
Power phase checkout gear in described a kind of energy back feed device, its low-pass filter circuit carries out filtering to this signal, and it can cause decay to harmonic wave more than three times.
Power phase checkout gear in said a kind of energy back feed device, its phase detecting circuit are relatively to obtain the supply voltage phase place through voltage zero-cross.
Power phase checkout gear in said a kind of energy back feed device, its filter circuit are the active or passive filtering of single order, or multistage active or passive filtering.
Power phase checkout gear in said a kind of energy back feed device, its phase shifting transformer and filter circuit position relation each other can exchange.
As shown in Figure 5, power phase detection method in said a kind of energy back feed device, its phase-detection are according to following works:
1. line voltage (the U that contains harmonic wave
i) the phase shift effect of signal through phase shifting transformer, obtain the leading voltage signal of phase place; In order to guarantee that phase shifting transformer carries out leading phase shift to voltage, shown in Fig. 5 (B), adopt circuit of testing the phase sequence that the line voltage phase sequence that inserts is detected, what guarantee access is correct phase sequence.
2. through the filter action of low-pass filter circuit, the harmonic signal more than 3 times is carried out algorithm, simultaneously the fundamental signal phase place is produced the hysteresis phase shift, the electric network voltage phase detection signal (U of final acquisition and line voltage same phase
S); The sinusoidal degree of this signal improves greatly, supplies with phase detecting circuit and uses, shown in Fig. 5 (C).
3. the power phase testing circuit obtains power phase accurately through the zero crossing of detection with the synchronous voltage signal of electrical network, offers the feedback control circuit and uses.
The present invention is not limited to above-mentioned preferred forms, and other any identical with the present invention or akin products that anyone draws under enlightenment of the present invention all drop within protection scope of the present invention.
Claims (9)
1. power phase checkout gear in the energy back feed device comprises feedback power circuit, feedback control circuit, phase shifting transformer, low-pass filter circuit and power phase testing circuit; It is characterized in that: line voltage (U
i) export to low-pass filter circuit through phase shifting transformer, give the power phase testing circuit after the low-pass filter circuit filtering, thereby export to feedback control circuit control feedback power circuit at last; Obtain leading phase shift through phase shifting transformer, low-pass filter circuit produces the hysteresis phase shift, through behind both composition complementaries the power supply first-harmonic not being produced phase shift.
2. power phase checkout gear in a kind of energy back feed device according to claim 1 is characterized in that: phase shifting transformer adopts the Y/ Δ to connect method, or adopts Δ/Y to connect method, through the adjustment phase sequence, can obtain leading phase π/6.
3. power phase checkout gear in a kind of energy back feed device according to claim 1; It is characterized in that: phase shifting transformer adopts former limit Y or Δ to connect method; Phase shifting transformer adopts the secondary extend-triangle to connect method; Can obtain the leading phase of different angles, leading phase is big more, and the time constant filter of low-pass filter circuit is can selectivity bigger.
4. power phase checkout gear in a kind of energy back feed device according to claim 1 is characterized in that: low-pass filter circuit carries out filtering to fundamental signal, and through the adjustment time constant filter, it produces arbitrarily angled hysteresis phase shift to fundamental signal.
5. power phase checkout gear in a kind of energy back feed device according to claim 1 is characterized in that: low-pass filter circuit carries out filtering to signal, and it can cause decay to harmonic wave more than three times.
6. power phase checkout gear in a kind of energy back feed device according to claim 1 is characterized in that: the power phase testing circuit is relatively to obtain the supply voltage phase place through voltage zero-cross.
7. power phase checkout gear in a kind of energy back feed device according to claim 1 is characterized in that: low-pass filter circuit is the active or passive filtering of single order, or multistage active or passive filtering.
8. power phase checkout gear in a kind of energy back feed device according to claim 1 is characterized in that: phase shifting transformer and low-pass filter circuit position relation each other can exchange.
9. power phase detection method in the energy back feed device is characterized in that: phase-detection is according to following works:
1. line voltage (the U that contains harmonic wave
i) the phase shift effect of signal through phase shifting transformer, obtain the leading voltage signal of phase place; In order to guarantee that phase shifting transformer carries out leading phase shift to voltage, adopt circuit of testing the phase sequence that the line voltage phase sequence that inserts is detected, what guarantee access is correct phase sequence;
2. through the filter action of low-pass filter circuit, the harmonic signal more than 3 times is carried out algorithm, simultaneously the fundamental signal phase place is produced the hysteresis phase shift, the electric network voltage phase detection signal (U of final acquisition and line voltage same phase
S);
3. the power phase testing circuit obtains power phase accurately through the zero crossing of detection with the synchronous voltage signal of electrical network, offers the feedback control circuit and uses.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200910081162 CN101854063B (en) | 2009-04-03 | 2009-04-03 | Device and method for detecting power phase in energy feedback device |
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| CN 200910081162 CN101854063B (en) | 2009-04-03 | 2009-04-03 | Device and method for detecting power phase in energy feedback device |
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| CN101854063A CN101854063A (en) | 2010-10-06 |
| CN101854063B true CN101854063B (en) | 2012-07-04 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102466765B (en) * | 2010-11-19 | 2014-01-08 | 北京中纺锐力机电有限公司 | Power supply inverter and power supply phase detection circuit thereof |
| US9250274B2 (en) * | 2011-08-25 | 2016-02-02 | Asco Power Technologies, L.P. | Power analysis module for monitoring an electrical power source |
| CN102981133B (en) * | 2012-11-01 | 2015-10-07 | 株洲南车时代电气股份有限公司 | A kind of correction during phase control rectifier controls causes the method for phase acquisition error because of frequency change |
| CN109193749B (en) * | 2018-07-23 | 2020-05-01 | 合肥工业大学 | Harmonic generation device based on recursive discrete Fourier transform and control method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200953175Y (en) * | 2006-09-27 | 2007-09-26 | 杨立志 | Electromagnetic wave antitheft device |
| CN200990575Y (en) * | 2006-12-31 | 2007-12-12 | 武汉欧德自动控制技术有限公司 | Elevator frequency changer external hanging energy feedback device |
| CN201118453Y (en) * | 2007-08-14 | 2008-09-17 | 湖北三环发展股份有限公司 | AC high-voltage high-power adjustable voltage stabilizing and frequency stabilizing power device |
| CN201464558U (en) * | 2009-04-03 | 2010-05-12 | 北京中纺锐力机电有限公司 | Power supply phase detection device in energy feedback device |
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- 2009-04-03 CN CN 200910081162 patent/CN101854063B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200953175Y (en) * | 2006-09-27 | 2007-09-26 | 杨立志 | Electromagnetic wave antitheft device |
| CN200990575Y (en) * | 2006-12-31 | 2007-12-12 | 武汉欧德自动控制技术有限公司 | Elevator frequency changer external hanging energy feedback device |
| CN201118453Y (en) * | 2007-08-14 | 2008-09-17 | 湖北三环发展股份有限公司 | AC high-voltage high-power adjustable voltage stabilizing and frequency stabilizing power device |
| CN201464558U (en) * | 2009-04-03 | 2010-05-12 | 北京中纺锐力机电有限公司 | Power supply phase detection device in energy feedback device |
Non-Patent Citations (2)
| Title |
|---|
| JP特开平10-293615A 1998.11.04 |
| JP特开平5-180879A 1993.07.23 |
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Owner name: NIDEC (BEIJING) DRIVE SYSTEM TECHNIQUE CO., LTD. Free format text: FORMER OWNER: BEIJING CHINA TEX MECHANICAL + ELECTRICAL ENGINEERING LTD. Effective date: 20150806 |
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Effective date of registration: 20150806 Address after: 101102 Beijing, Tongzhou District Sheng King South Street, No. 13, No. 101, 201-1, 301, 15, Patentee after: Nideke (Beijing) Transmission Technology Co. Ltd Address before: 101102, Beijing, Zhongguancun science and Technology Park, Jinqiao Science and technology industrial base, 15 South four street, 16A, Tongzhou District Patentee before: Beijing China Tex Mechanical & Electrical Engineering Ltd. |
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