CN104079193A - Device for direct current component adjustment and control method thereof - Google Patents
Device for direct current component adjustment and control method thereof Download PDFInfo
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- CN104079193A CN104079193A CN201410304599.8A CN201410304599A CN104079193A CN 104079193 A CN104079193 A CN 104079193A CN 201410304599 A CN201410304599 A CN 201410304599A CN 104079193 A CN104079193 A CN 104079193A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention provides a device for direct current component adjustment and a control method thereof. According to a direct current output content adjustment control circuit, current signals of an inversion end are obtained through a signal collecting device, alternating-current components of the signals at the position are removed through an n-order filtering circuit, direct-current components are amplified and provided for an AD collecting port of a processor through an amplifying circuit, and meanwhile temperature compensating signals and AD sampling real-time correction compensating signals on a signal panel are transmitted to the AD collecting port of the processor. The function of real-time offset correction function is achieved, the function of eliminating zero drift and temperature drift of sampling circuit devices is also achieved, adjustment is easy to achieve, the DCI index can be controlled within 2 %o, and the standards of all countries can be completely met.
Description
Technical field
The present invention relates to photovoltaic DC-to-AC converter electricity generation system, relate to particularly device and the control method thereof of the DC component adjusting of photovoltaic DC-to-AC converter.
Background technology
Contacting of the development of society and energy development is more and more tightr, and traditional primary energy (coal, natural gas, oil etc.) day by day reduces, and the environmental problems such as haze are day by day serious, and clean reproducible energy is paid attention to day by day widely.Photovoltaic power generation technology as one of clean reproducible energy is increasingly mature, along with the reduction parallel network power generation of cost will be using in scope widely.
Along with the scale of parallel network power generation increases, it is also increasing on the impact of the electrical network quality of power supply and operation conditions.If direct current output too high levels can cause the transformer in grid equipment to occur magnetic saturation phenomenon in the alternating current being connected to the grid, cause primary current peak to increase burning input insurance and cause power-off etc.; Therefore various countries have formulated strict grid-connected standard and have put into effect corresponding safety file.This has proposed higher designing requirement to photovoltaic combining inverter.
In safety standard, an important indicator is direct current (DCI) output content.The safety standard (as AS4777, VDE4105 etc.) of most countries all requires direct current output content to be less than 5 ‰ of output rated current, and indivedual national safety (as G83) require stricter---and direct current output content is less than 20mA.
Whether the existing control method for direct current output content, according to using extra external devices to be divided into two kinds: use extra external devices to suppress DCI and do not use extra external devices to suppress DCI;
Use extra external devices to suppress DCI, mainly contain at present method in 2: a kind of method is to use isolating transformer to intercept the transmission of direct current, this quadrat method is because being used isolating transformer, reduce the conversion efficiency of inverter, volume due to isolating transformer is large in addition, cost is high, is unfavorable for large-scale expansion; Another kind method is in inverter, to increase capacitance, and the weak point of this method is that this capacitance, under the frequency of utility grid, presents low impedance state, and the capacitance of the method electric capacity is large, has increased the cost of system.
In addition, the method that uses extra external devices to suppress DCI also has a shortcoming: can not tackle neatly the electrical network situation of country variant (such as the countries and regions such as the U.S., Mexico, Taiwan are the utility grid of 60Hz, and the countries such as China, Germany, Britain are used the utility grid of 50Hz), therefore need to do corresponding optimization process for the electrical network situation of different countries.
At present, not using extra external devices to suppress the method for DCI, is mainly to be detected DC component and then carried out corresponding compensation correction by transducer or sampling resistor.This scheme, because the device of sensor sample circuit exists null offset and temperature drift, is therefore difficult to DCI accurately to detect and regulating and controlling, and its production yield is lower in addition.
Summary of the invention
For solving deficiency of the prior art, the object of the present invention is to provide a kind of photovoltaic DC-to-AC converter DC component regulate device and the scheme of control method, not only possessed real time correction offset functions but also possessed the function of eliminating sample circuit device and exist null offset and temperature drift, be easy to realize and regulate, DCI index can be controlled in 2 ‰, meet the standard of every country completely, cost is also lower.
In order to realize object of the present invention, the present invention realizes by following technical solution:
The device that the DC component of photovoltaic DC-to-AC converter regulates,
Above-mentioned inverter has:
DC-DC module, inversion module, signal sampling device, filtering discharge circuit, temperature sampling device, AD sampler, processor;
The input of the output access inversion module of above-mentioned DC-DC module;
Above-mentioned signal sampling device, by the output of sampling inversion module, extracts the information of DC component and feeds back to processor;
Said temperature sampler, is transferred to described processor by the temperature signal of collection;
Above-mentioned AD sampler, is transferred to described processor by AD real time correction compensating signal;
Above-mentioned processor, the information of extracting according to above-mentioned signal sampling device, said temperature signal and/or AD real time correction compensating signal, generate control signal and offer PWM debugger,
Carry out PWM modulation.
Preferably, the signal of above-mentioned signal sampling device sampling, removes ac component by n rank filter circuit.
Further, said n rank filter circuit is 3 rank filter circuits.
Preferably, above-mentioned signal sampler is sampling resistor or Hall element.
Preferably, said temperature sampler negative temperature resistance.
Embodiments of the invention also provide a kind of electricity generation system of device of DC component adjusting of carrying photovoltaic DC-to-AC converter.
The control method that embodiments of the invention also provide a kind of DC component of photovoltaic DC-to-AC converter to regulate,
Said method comprises following steps:
Step 1: before grid-connected inverters work, processor becomes the initial value of sub-signal as the drift correction numerical value of sample circuit device the DCI collecting;
Step 2: after grid-connected inverters work, rectification building-out when processor becomes sub-signal to put into effect according to temperature compensation signal and AD sampling real time correction compensating signal to DCI;
Step 3: become sub-signal to analyze to DCI after rectification building-out, and according to this signal provide regulate controlling party to amplitude, regulate that inversion PWM's is given.
In one embodiment, in above-mentioned steps 1, above-mentioned processor obtains the null offset numerical value of DCI sample circuit.
In one embodiment, in above-mentioned steps 2, also comprise the correction that resets of temperature compensation signal and AD sampling real time correction compensating signal.
In one embodiment, in above-mentioned steps 2, temperature compensation signal is negative temperature compensating signal.
Embodiments of the invention also provide a kind of electricity generation system that direct current output contains quantity regulating device that has of carrying above-mentioned any one said method.
Beneficial effect
The control method that the DCI component that the present invention proposes regulates, tool has the following advantages:
(1) adopt n rank filter amplification circuit can make the AD sampling resolution of processor improve, in the time that DCI is less than 10mA, also can differentiate sampling;
(2) extract the DCI circuit signal before grid-connected inverters work, can determine the null offset of sample circuit device;
(3) can carry out real time correction to the DCI signal after grid-connected inverters work according to the temperature compensation signal after proofreading and correct and AD sampling real time correction compensating signal, improve the accuracy of signal resolution;
(4) make corresponding adjusting control according to the signal of differentiating by processor, DCI component can be controlled in 2 ‰; Not only possessed real time correction offset functions but also possessed the function of eliminating sample circuit device and exist null offset and temperature drift, be easy to realize regulating, met the standard of every country completely.
Brief description of the drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention; below by embodiment comprise the accompanying drawing that needs in technical description to use and do and introduce simply; apparently; accompanying drawing in the following describes is only some embodiments of the present invention; for those of ordinary skill in the art; do not paying under the prerequisite of creative work, the distortion accompanying drawing that can also obtain other according to these accompanying drawings is all within protection scope of the present invention.
Fig. 1 is the structural representation of photovoltaic generating system of the present invention,
Fig. 2 is the flow chart of DC component adjustment control method of the present invention;
Fig. 3 is inverter algorithm flow schematic diagram of the present invention;
Symbol description: 1, photovoltaic module; 2, inverter; 3, civil power.
Embodiment
Below in conjunction with specific embodiment, such scheme is described further.Should be understood that these embodiment are not limited to limit the scope of the invention for the present invention is described.
Embodiment:
As shown in Figure 1, be the structural representation of grid-connected photovoltaic system.The direct current that photovoltaic module 1 produces, after the inversion of inverter 2 (photovoltaic DC-to-AC converter), the alternating current meeting the demands is through filtering (not shown) access civil power 3; Inverter 2 includes DC/DC module 4, DC/AC module 5, and the direct current that DC/DC module 4 is exported is input to DC/AC module 5.Signal sampler gathers the electric current that DC/AC module 5 is exported, extract wherein DC current component, feed back to processor by information after filter amplification circuit, what corresponding temperature sampling signal and AD sampling real-Time Compensation signal were real-time feeds back to processor by information, by PWM adjuster, the PWM of output is adjusted.
As shown in Figure 2, be the flow chart of the control method of this programme, adjustment control method comprises:
Step 1: before grid-connected inverters, sampler sample detecting DCI signal, obtains the null offset numerical value of DCI sample circuit;
And to the correction that resets of temperature compensation signal and AD sampling real time correction compensating signal;
Step 2: after grid-connected inverters, sample detecting DCI signal, obtains the numerical value of DCI sample circuit;
According to temperature compensation signal and AD sampling real time correction compensating signal, DCI signal is carried out to real time correction compensation;
Step 3: determine that according to the DCI signal gathering DCI regulates direction and the amplitude controlled;
And then by PWM adjuster, to output, PWM adjusts.
To in step 3, DCI regulates the explanation of the direction of controlling,
Select suitable regulating and controlling cycle T according to the time constant of DCI filter circuit; Set DCI according to designing requirement and regulate " positive and negative limits value " (such as ± 10mA) of controlling.In cycle T to compensation after DCI signals collecting and ask its mean value Ave (DCI):
N is sampling number in the T cycle; Sample (DCI)
ifor the i time DCI sampling numerical value in the T cycle.
Expansion is optimized---regulate the judgment basis of direction as DCI using the DCI sampling numerical value in rear 1/m cycle of regulating cycle T.Selected resistance to overturning and the time constant that needs comparative analysis DCI controlling and regulating system of m, selects suitable m value can eliminate DCI and starts the deviation that adjustment process is brought;
If Ave (DCI) is greater than " positive limits value ", controlling DCI adjusting direction is negative direction;
Otherwise controlling DCI adjusting direction is positive direction;
When Ave (DCI) does not regulate in positive and negative limits value limited range.
As shown in Figure 3, be the algorithm flow schematic diagram that comprises adjustment control method technical scheme, next Fig. 3 is described in detail:
Inverter prime (Boost and MPPT) is controlled to the voltage given drawing and deducted current voltage V (per) formation voltage difference with reference to V (ref);
And this voltage difference is calculated to given value of current with reference to I (ref) through " Voltage loop controller control methods such as () PI adjustings ";
Given value of current is offered to " current loop controller " with reference to I (ref), current inverter current I (per) and through the DCi signal of real-Time Compensation;
" current loop controller ", through controlling accordingly, offers PWM debugger by control signal, generates PWM modulation signal.
Temperature-compensating explanation:
Calculating to temperature-compensating has following methods:
1. according to empirical equation, the AD sampling under different temperatures is carried out to real-Time Compensation;
2. within the scope of pair inverter work total temperature, AD sampling deviation carries out actual test, makes temperature compensation table; Controlled temperature compensation meter carries out the compensation of AD sampling.
The explanation of AD sampling real-Time Compensation:
On the AD of chip passage, access one or more high-accuracy voltage signals (suggestion-dedicated AD passage, multiplexing AD passage also can), the high-accuracy voltage deviation of signal sampling according to AD in the time that DC current component is sampled carries out real-Time Compensation.
The technique effect of this programme:
3 rank filter amplification circuit can make the AD sampling resolution of processor improve, and also can differentiate sampling in the time that DCI is less than 10mA;
(2) extract the DCI circuit signal before grid-connected inverters work, can determine the null offset of sample circuit device;
(3) can carry out real time correction to the DCI signal after grid-connected inverters work according to the temperature compensation signal after proofreading and correct and AD sampling real time correction compensating signal, improve the accuracy of signal;
(4) make corresponding PWM according to signal accurately by processor and regulate and control, DCI can be controlled in 2 ‰.
Above-mentioned example is only explanation technical conceive of the present invention and feature, and its object is to allow person skilled in the art can understand content of the present invention and implement according to this, can not limit the scope of the invention with this.For example.In embodiment, use 3 rank ripple amplifying circuits, other exponent number also can.All equivalent transformations that Spirit Essence does according to the present invention or modification, within all should being encompassed in protection scope of the present invention.
Claims (10)
1. the device that the DC component of photovoltaic DC-to-AC converter regulates, is characterized in that:
Described inverter has:
DC-DC module, inversion module, signal sampling device, filtering discharge circuit, temperature sampling device, AD sampler, processor;
Described signal sampling device, by the output of sampling inversion module, extracts the information of DC component and feeds back to processor;
Described temperature sampling device, is transferred to described processor by the temperature signal of collection;
Described AD sampler, is transferred to described processor by AD real time correction compensating signal;
Described processor, the information of extracting according to described signal sampling device, described temperature signal and/or AD real time correction compensating signal, generate control signal and offer PWM debugger,
Carry out PWM modulation.
2. device as claimed in claim 1, is characterized in that:
The signal of described signal sampling device sampling, removes ac component by n rank filter circuit.
3. device as claimed in claim 2, is characterized in that:
Described n rank filter circuit is 3 rank filter circuits.
4. device as claimed in claim 1, is characterized in that:
Described signal sampler is sampling resistor or Hall element.
5. device as claimed in claim 1, is characterized in that:
Described temperature sampling device negative temperature resistance.
6. there is a direct current output adjustment control method for the photovoltaic DC-to-AC converter of direct current output content adjusting control circuit,
It is characterized in that:
Described method comprises following steps:
Step 1: before grid-connected inverters work, ` becomes the initial value of sub-signal as the drift correction numerical value of sample circuit device the DCI collecting;
Step 2: after grid-connected inverters work, rectification building-out when processor becomes sub-signal to put into effect according to temperature compensation signal and AD sampling real time correction compensating signal to DCI;
Step 3: become sub-signal to analyze to DCI after rectification building-out, and according to this signal provide regulate controlling party to amplitude, regulate that inversion PWM's is given.
7. method as claimed in claim 6, is characterized in that:
In described step 1, described processor obtains the null offset numerical value of DCI sample circuit.
8. method as claimed in claim 6, is characterized in that:
In described step 2, also comprise the correction that resets of temperature compensation signal and AD sampling real time correction compensating signal.
9. method as claimed in claim 6, is characterized in that:
In described step 2, temperature compensation signal is negative temperature compensating signal.
10. the photovoltaic generating system of lift-launch method as described in any one in claim 6-9.
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Cited By (7)
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| CN105388429A (en) * | 2015-12-10 | 2016-03-09 | 江苏兆伏新能源有限公司 | Grid-connected inverter detection and control circuit |
| CN107231149A (en) * | 2017-06-08 | 2017-10-03 | 深圳驰芯微电子有限公司 | Chip and method for manufacturing the same |
| CN108169596A (en) * | 2017-12-22 | 2018-06-15 | 湖南科比特新能源科技股份有限公司 | A kind of calibration system of photovoltaic DC-to-AC converter input current channel and the method calibrated using the calibration system |
| CN112468008A (en) * | 2020-10-29 | 2021-03-09 | 江苏固德威电源科技股份有限公司 | Direct current component adjusting method |
| CN112636346A (en) * | 2019-10-08 | 2021-04-09 | 维谛技术有限公司 | Direct current compensator, compensation method, compensation device and storage medium |
| CN114725983A (en) * | 2022-02-24 | 2022-07-08 | 江苏阿诗特能源科技有限公司 | Energy storage inverter direct-current component regulation control method and device |
| CN114994388A (en) * | 2022-05-25 | 2022-09-02 | 北京中联太信科技有限公司 | Method and system for magnetic superconducting micro-direct current detection and analysis |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105388429A (en) * | 2015-12-10 | 2016-03-09 | 江苏兆伏新能源有限公司 | Grid-connected inverter detection and control circuit |
| CN107231149A (en) * | 2017-06-08 | 2017-10-03 | 深圳驰芯微电子有限公司 | Chip and method for manufacturing the same |
| CN108169596A (en) * | 2017-12-22 | 2018-06-15 | 湖南科比特新能源科技股份有限公司 | A kind of calibration system of photovoltaic DC-to-AC converter input current channel and the method calibrated using the calibration system |
| CN112636346A (en) * | 2019-10-08 | 2021-04-09 | 维谛技术有限公司 | Direct current compensator, compensation method, compensation device and storage medium |
| CN112636346B (en) * | 2019-10-08 | 2024-03-08 | 维谛新能源有限公司 | DC compensator, compensation method, device and storage medium |
| CN112468008A (en) * | 2020-10-29 | 2021-03-09 | 江苏固德威电源科技股份有限公司 | Direct current component adjusting method |
| CN114725983A (en) * | 2022-02-24 | 2022-07-08 | 江苏阿诗特能源科技有限公司 | Energy storage inverter direct-current component regulation control method and device |
| CN114994388A (en) * | 2022-05-25 | 2022-09-02 | 北京中联太信科技有限公司 | Method and system for magnetic superconducting micro-direct current detection and analysis |
| CN114994388B (en) * | 2022-05-25 | 2023-05-12 | 北京中联太信科技有限公司 | Method and system for detecting and analyzing magnetic superconducting micro direct current |
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| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 200023 room 904b, 757 Mengzi Road, Huangpu District, Shanghai Patentee after: Asway Power Equipment Trading (Shanghai) Co.,Ltd. Address before: Units 701 and 707B on the 7th floor of Zhongjian Building, 1568 Century Avenue, Pudong New Area, Shanghai 200000 Patentee before: ESWEI NEW ENERGY TECHNOLOGY (SHANGHAI) Co.,Ltd. |