CN102539900A - Hybrid detecting device for alternating-current voltage and direct-current voltage of wind power converter - Google Patents
Hybrid detecting device for alternating-current voltage and direct-current voltage of wind power converter Download PDFInfo
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- CN102539900A CN102539900A CN2012100034352A CN201210003435A CN102539900A CN 102539900 A CN102539900 A CN 102539900A CN 2012100034352 A CN2012100034352 A CN 2012100034352A CN 201210003435 A CN201210003435 A CN 201210003435A CN 102539900 A CN102539900 A CN 102539900A
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Abstract
The invention discloses a hybrid detecting device for an alternating-current voltage and a direct-current voltage of a wind power converter, and the hybrid detecting device comprises an alternating-current and direct-current high-voltage sampling circuit, a conditioning circuit, an RC (resistor-capacitor) filter circuit and an AD (analog-digital) converting circuit, which are connected in sequence, wherein the alternating-current and direct-current high-voltage sampling circuit is used for detecting the alternating-current voltage and the direct-current voltage of the wind power converter; the conditioning circuit is used for filtering high-frequency interference out from a sampled signal and is separated from a control system; the RC filter circuit is used for filtering out the high-frequency interference of the system and reducing burrs of a waveform; the AD converting circuit is used for converting an analog signal which is output after passing through the RC filter circuit into a digital signal; the AD converting circuit outputs the signal to a CPU (central processing unit) to process the signal; the CPU controls an executor to execute a processing result; and the conditioning circuit is further connected with a signal indicating lamp for indicating that a wind power converter system begins working. The invention aims at providing the hybrid detecting device for the alternating-current voltage and the direct-current voltage of the wind power converter, by using the hybrid detecting device, the detection of the alternating-current voltage and the detection of the direct-current voltage are integrated, and the simultaneous detection of various voltages in different amplitude ranges is achieved.
Description
[technical field]
The present invention relates to a kind of wind electric converter combined-voltage mixing pick-up unit.
[background technology]
The voltage detecting of wind electric converter comprises that DC voltage detects, and alternating voltage detects, and mostly traditional pick-up unit is standardized product, function singleness; Can't realize that alternating current-direct current uses simultaneously, not possess expanded function, it is single to detect the voltage magnitude scope; Single product is only for single range, and requirement is many, and it is big to take up room; Influence Design of Mechanical Structure and product is attractive in appearance, cost is higher, and controllability is poor; And the inventor realizes what multiple different amplitude range voltage detected simultaneously, perfect in shape and function, the present invention who occupies little space through making great efforts to design the collection DC voltage and detect and alternating voltage being detected on one.
[summary of the invention]
The present invention has overcome the deficiency of above-mentioned technology, provides a kind of collection DC voltage detection and alternating voltage to be detected on one, realizes the wind electric converter combined-voltage mixing pick-up unit that multiple different amplitude range voltage detects simultaneously.
For realizing above-mentioned purpose, the present invention has adopted following technical proposal:
A kind of wind electric converter combined-voltage mixing pick-up unit includes in order and to connect:
Alternating current-direct current high pressure sample circuit 1; Be connected with system's main circuit of wind electric converter; Direct current positive and negative busbar voltage, current transformer after being used to detect DC bus-bar voltage, BOOST circuit after the generator output rectification and boosting exports the three-phase alternating voltage of net side to, amounts to the voltage of 6 voltage detecting points.
Modulate circuit 2; The various voltage signals of returning 1 sampling through alternating current-direct current high pressure sample circuit pass through the RC low-pass filter respectively; Some high frequency interference in the elimination sampled signal are passed through differential amplifier circuit again, isolate signal and control system that sampling is returned.
A/D convertor circuit 4 becomes digital signal to the analog signal conversion through the 3 back outputs of RC filtering circuit, and exports to CPU to signal and handle, and CPU control actuator is carried out result.
Said modulate circuit 2 comprises and is used for single amplifier chip of isolating sampled signal and control system that said single amplifier chip model is AD8221.
Also be connected with on the said modulate circuit 2 and be used to indicate the signal lamp 5 that the wind electric converter system starts working.
Said A/D convertor circuit 4 comprises the AD chip that becomes analog signal conversion digital signal, and said AD chip model is AD7657.
The invention has the beneficial effects as follows: 1, perfect in shape and function, on a product, realize two kinds of heterogeneity voltage detecting, only can realize repertoire with a device; 2, to the characteristics of various wind electric converters, can realize customizedly, circuit can be adjusted according to actual needs, possesses good expanded function; Detect when 3, realizing multiple different amplitude range voltage; 4, take up room for a short time, reduce product required floor area is installed, do not influence Design of Mechanical Structure and product is attractive in appearance; 5, centralized arrangement is convenient to safeguard, raises the efficiency.
[description of drawings]
Fig. 1 is a structure principle chart of the present invention.
Fig. 2 is that the present invention connects synoptic diagram at the check point of system's main circuit.
Fig. 3 is an alternating current-direct current high pressure sample circuit circuit diagram of the present invention.
Fig. 4 is a modulate circuit circuit diagram of the present invention.
Fig. 5 RC filtering circuit of the present invention and A/D convertor circuit CC figure.
Fig. 6 is a signal lamp circuit diagram of the present invention.
[embodiment]
Shown in Fig. 1-6, a kind of wind electric converter combined-voltage mixing pick-up unit includes the alternating current-direct current high pressure sample circuit 1, modulate circuit 2, RC filtering circuit 3, the A/D convertor circuit 4 that connect in order.
Said alternating current-direct current high pressure sample circuit 1; Be connected with system's main circuit of wind electric converter; Direct current positive and negative busbar voltage, current transformer after being used for detecting DC bus-bar voltage, BOOST circuit after the wind electric converter generator output rectification and boosting exports the three-phase alternating voltage of net side to, amounts to the voltage of 6 voltage detecting points, behind check point signal entering alternating current-direct current high pressure sample circuit 1; Resistance through one group of series connection is respectively 200K, 200K, 274K, 16.2K, 10K; Total is that resistance is 700K ohm, press from the two ends power taking of 10K Ohmage, and this resistance two ends parallel connection the electric capacity elimination high frequency interference of a 10nF; This is exactly a sample voltage value, and the relation of it and actual voltage value is: 1 to 70 relation.Each parameter setting of present embodiment mainly is used in the 3MW wind electric converter system; After this change commentaries on classics; The sampled value Urec+ of the DC bus-bar voltage after the generator output rectification is 0-15VDC; Sampled value Udc+, the Udc-of the direct current positive and negative busbar voltage after the BOOST circuit boosts are 0-± 8.5VDC, and three-phase alternating voltage sampled value UL1, UL2, UL3 that current transformer exports the net side to are 8.9VAC, and said alternating current-direct current high pressure sample circuit 1 can also change the size of resistance and electric capacity in the circuit; Thereby change range and detection ratio size, adapt to wider combined-voltage and detect.
Said modulate circuit 2; Comprise single amplifier AD8221, the various voltage signals that 1 sampling of alternating current-direct current high pressure sample circuit is returned are respectively through RC low-pass filter in the modulate circuit 2, some high frequency interference in the elimination sampled signal; Be connected on single amplifier AD8221 input end then; The magnification ratio of said single amplifier AD8221 is 1: 1, mainly is to isolate signal and control system that sampling is returned, exports to RC filtering circuit 3 then.
Said RC filtering circuit 3, the high frequency interference of elimination system, the burr of minimizing waveform outputs signal to A/D convertor circuit 4.
Said A/D convertor circuit 4 comprises chip AD7657, and said AD7657 is that 14,6 passages, throughput are the modulus conversion chip of 250kSPS, and it can also gather positive/negative voltage signal.Simulating signal behind process RC filtering circuit 3 is connected on the chip AD7657 and converts digital signal to; Chip AD7657 exports to CPU to digital signal and handles; CPU judges system's main circuit whether be incorporated into the power networks power supply or off-grid, and sends the work of control command control actuator.
Said modulate circuit 2 also connects is used to the signal lamp 5 that the system that indicates is working, and the voltage signal that modulate circuit 2 comes out is through the resistance of a 6.8K ohm, and the LED light emitting diode of connecting is again got back to power cathode at last.When voltage signal was high level, light emitting diode will be bright, just explains that also this device starts working.
Claims (4)
1. wind electric converter combined-voltage mixing pick-up unit is characterized in that including and connects in order:
Alternating current-direct current high pressure sample circuit (1); Be connected with system's main circuit of wind electric converter; Direct current positive and negative busbar voltage, current transformer after being used to detect DC bus-bar voltage, BOOST circuit after the generator output rectification and boosting exports the three-phase alternating voltage of net side to, amounts to the voltage of 6 voltage detecting points.
Modulate circuit (2); The various voltage signals that are used for returning the sampling through alternating current-direct current high pressure sample circuit (1) are respectively through the RC low-pass filter; Some high frequency interference in the elimination sampled signal are passed through differential amplifier circuit again, isolate signal and control system that sampling is returned.
RC filtering circuit (3), the high frequency interference of elimination through also existing in the signal of modulate circuit (2) conditioning back, the burr of minimizing waveform.
A/D convertor circuit (4) becomes digital signal to the analog signal conversion behind the process RC filtering circuit (3), and exports to CPU to signal and handle.
2. a kind of wind electric converter combined-voltage mixing pick-up unit according to claim 1 is characterized in that also being connected with on the said modulate circuit (2) and is used to indicate the signal lamp (5) that the wind electric converter system starts working.
3. a kind of wind electric converter combined-voltage mixing pick-up unit according to claim 1; It is characterized in that said modulate circuit (2) comprises is used for single amplifier chip of isolating sampled signal and control system, and said single amplifier chip model is AD8221.
4. a kind of wind electric converter combined-voltage mixing pick-up unit according to claim 1 is characterized in that said A/D convertor circuit (4) comprises the AD chip that becomes analog signal conversion digital signal, and said AD chip model is AD7657.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100034352A CN102539900A (en) | 2012-01-05 | 2012-01-05 | Hybrid detecting device for alternating-current voltage and direct-current voltage of wind power converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100034352A CN102539900A (en) | 2012-01-05 | 2012-01-05 | Hybrid detecting device for alternating-current voltage and direct-current voltage of wind power converter |
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| CN102539900A true CN102539900A (en) | 2012-07-04 |
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| CN2012100034352A Pending CN102539900A (en) | 2012-01-05 | 2012-01-05 | Hybrid detecting device for alternating-current voltage and direct-current voltage of wind power converter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103604983A (en) * | 2013-11-23 | 2014-02-26 | 大连尚能科技发展有限公司 | System for controlling operation parameters of wind power current transformer based on DSP and ARM |
| CN108627690A (en) * | 2018-04-03 | 2018-10-09 | 芜湖美的厨卫电器制造有限公司 | A kind of ac voltage detection circuit, detection method and detection device |
| CN109188062A (en) * | 2018-09-04 | 2019-01-11 | 兰州理工大学 | A kind of MMC submodule capacitor voltage detection method and device |
| CN109490708A (en) * | 2018-11-15 | 2019-03-19 | 湖南长高思瑞自动化有限公司 | A kind of intelligent low-pressure branch monitoring device |
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| US5457621A (en) * | 1992-02-21 | 1995-10-10 | Abb Power T&D Company Inc. | Switching power supply having voltage blocking clamp |
| CN200979572Y (en) * | 2006-12-15 | 2007-11-21 | 天津电气传动设计研究所 | A high voltage signal detection system for AC-AC frequency conversion system |
| CN101833029A (en) * | 2010-05-27 | 2010-09-15 | 南车株洲电力机车研究所有限公司 | Method and circuit for detecting bus voltage of wind power current transformer |
| CN201774447U (en) * | 2010-08-26 | 2011-03-23 | 哈尔滨九洲电气股份有限公司 | Current and voltage sampling signal conditioning board of wind power generation current transformer |
-
2012
- 2012-01-05 CN CN2012100034352A patent/CN102539900A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5457621A (en) * | 1992-02-21 | 1995-10-10 | Abb Power T&D Company Inc. | Switching power supply having voltage blocking clamp |
| CN200979572Y (en) * | 2006-12-15 | 2007-11-21 | 天津电气传动设计研究所 | A high voltage signal detection system for AC-AC frequency conversion system |
| CN101833029A (en) * | 2010-05-27 | 2010-09-15 | 南车株洲电力机车研究所有限公司 | Method and circuit for detecting bus voltage of wind power current transformer |
| CN201774447U (en) * | 2010-08-26 | 2011-03-23 | 哈尔滨九洲电气股份有限公司 | Current and voltage sampling signal conditioning board of wind power generation current transformer |
Non-Patent Citations (1)
| Title |
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| 蒋新成: "基于DSP的变速恒频风力发电机控制器的研究与设计", 《中国优秀硕士学位论文全文数据库工程科技II辑》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103604983A (en) * | 2013-11-23 | 2014-02-26 | 大连尚能科技发展有限公司 | System for controlling operation parameters of wind power current transformer based on DSP and ARM |
| CN108627690A (en) * | 2018-04-03 | 2018-10-09 | 芜湖美的厨卫电器制造有限公司 | A kind of ac voltage detection circuit, detection method and detection device |
| CN109188062A (en) * | 2018-09-04 | 2019-01-11 | 兰州理工大学 | A kind of MMC submodule capacitor voltage detection method and device |
| CN109490708A (en) * | 2018-11-15 | 2019-03-19 | 湖南长高思瑞自动化有限公司 | A kind of intelligent low-pressure branch monitoring device |
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Application publication date: 20120704 |