CN203422418U - Bias detection device for photovoltaic grid-connected inverter - Google Patents
Bias detection device for photovoltaic grid-connected inverter Download PDFInfo
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- CN203422418U CN203422418U CN201320309074.4U CN201320309074U CN203422418U CN 203422418 U CN203422418 U CN 203422418U CN 201320309074 U CN201320309074 U CN 201320309074U CN 203422418 U CN203422418 U CN 203422418U
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Abstract
The utility model discloses a bias detection device for a photovoltaic grid-connected inverter, mainly comprising a voltage input module, a full-bridge inverter module, a current sampling module, an A/D conditioning module, a microcontroller module, and a power frequency isolation transformer module. The output end of the voltage input module is connected with a primary end of a power frequency isolation transformer via the full-bridge inverter module, a secondary end of the power frequency isolation transformer is connected with a load; the input end of the current sampling module is connected on a signal acquisition end of the full-bridge inverter module, the output end of the current sampling module is connected with the input end of the microcontroller module via the A/D conditioning module, and the output end of the microcontroller module is connected with a signal control end of the full-bridge inverter module. The bias detection device is characterized by small volume, low cost, and high reliability, and can reduce influence brought by biasing.
Description
Technical field
The utility model relates to photovoltaic combining inverter field, is specifically related to a kind of photovoltaic combining inverter magnetic bias pick-up unit.
Background technology
At present, the detection of full-bridge grid-connected inverter transformer magnetic bias and the common method of inhibition have: in main circuit transducer, seal in electric capacity and RC circuit voltage integral method.Wherein, in loop, seal in electric capacity and can only play mitigation to transformer iron core magnetic bias, can not fundamentally eliminate magnetic bias.RC circuit voltage integral method is owing to adopting the mode of indirectly measuring, and in full-bridge inverter, the distribution of electric capacity is also uncertain, so its measuring accuracy need to improve.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of photovoltaic combining inverter magnetic bias pick-up unit, and it has the advantages that volume is little, cost is low, reliability is strong, and can reduce the impact that bias phenomenon brings.
For addressing the above problem, the photovoltaic combining inverter magnetic bias pick-up unit that the utility model is designed, is mainly comprised of voltage load module, full-bridge inverter module, current sample module, A/D conditioning module, micro controller module, power frequency isolating transformer module; Wherein voltage load module comprises solar panel array and battery pack, the output terminal of solar panel array connects the input end of battery pack, the output terminal of battery pack connects the primary side of power frequency isolating transformer via full-bridge inverter module, the out secondary of power frequency isolating transformer is connected with load; The input end of current sample module is connected on the signals collecting end of full-bridge inverter module, the output terminal of current sample module is connected with the input end of micro controller module through A/D conditioning module, and the output terminal of micro controller module connects the signal controlling end of full-bridge inverter module.
In such scheme, described full-bridge inverter module comprises 4 triode V1-V4,4 backward dioded Vd1-Vd4,2 capacitor C 1, C2, and inductance L; The positive pole of backward dioded Vd1 is connected on the emitter of triode V1, and negative pole is connected on the collector of triode V1; The positive pole of backward dioded Vd2 is connected on the emitter of triode V2, and negative pole is connected on the collector of triode V2; The positive pole of backward dioded Vd3 is connected on the emitter of triode V3, and negative pole is connected on the collector of triode V3; The positive pole of backward dioded Vd4 is connected on the emitter of triode V4, and negative pole is connected on the collector of triode V4; Capacitor C1 is connected in parallel on the output head anode and negative pole of battery pack; The emitter of triode V1 is connected with the collector of triode V2, and is jointly connected to the input anode of current sample module; The collector of triode V1 is connected on the output head anode of battery pack, and the emitter of triode V2 is connected on the negative pole of output end of battery pack; The emitter of triode V3 is connected with the collector of triode V4, and is jointly connected to the input cathode of current sample module; The collector of triode V3 is connected on the output head anode of battery pack, and the emitter of triode V4 is connected on the negative pole of output end of battery pack; The emitter of triode V1 is connected and holds the positive pole that is connected power frequency isolating transformer primary side through inductance L with the collector of triode V2, and the emitter of triode V3 is connected and holds the negative pole that is directly connected power frequency isolating transformer primary side with the collector of triode V4; Capacitor C 2 is connected in parallel on the positive pole and negative pole of power frequency isolating transformer primary side.
In such scheme, described 4 triode V1-V4 are insulated gate bipolar transistor.
In such scheme, described current sample module comprises Hall current sensor, operational amplifier, current filter and A/D converter; Wherein the input end of Hall current sensor is connected on the input end of DC-DC transducer; The output terminal of Hall current sensor is connected the input end of A/D converter successively with current filter through operational amplifier; The output terminal of A/D converter connects the input end of multinuclear processing module.
In such scheme, described micro controller module is ARM process chip.
Compared with prior art, the utility model utilizes the mode of auto adapted filtering and combines digital signal processing the switching current of full bridge inverter is adjusted, adopt high speed ARM chip as the control chip of pick-up unit, the features such as high speed, the programmability of this chip be strong have been given full play to, make this magnetic bias pick-up unit realize digitizing, have volume little, cost is low, the features such as controllability is strong, are applicable to inverter system field.
Accompanying drawing explanation
Fig. 1 is general structure block diagram of the present utility model.
Fig. 2 is that the full-bridge grid-connected inverter magnetic bias of the utility model produces schematic diagram.
Fig. 3 is the utility model microcontroller internal data handling principle block diagram.
Fig. 4 is the processing structural drawing of the utility model lattice filter.
Fig. 5 is the utility model gradient adaptive lattice filter Combined Treatment structure.
Embodiment
A magnetic bias pick-up unit, as shown in Figure 1, it is mainly comprised of voltage load module, full-bridge inverter module, current sample module, A/D conditioning module, micro controller module, power frequency isolating transformer module.Wherein voltage load module comprises solar panel array and battery pack, the output terminal of solar panel array connects the input end of battery pack, the output terminal of battery pack connects the primary side of power frequency isolating transformer via full-bridge inverter module, the out secondary of power frequency isolating transformer is connected with load.The input end of current sample module is connected on the signals collecting end of full-bridge inverter module, the output terminal of current sample module is connected with the input end of micro controller module through A/D conditioning module, and the output terminal of micro controller module connects the signal controlling end of full-bridge inverter module.
Voltage load module: formed by solar panel array and battery pack, for photovoltaic parallel in system provides input voltage.
Full-bridge inverter module: adopt full bridge circuit, the flow direction of electric current in 4 road IGBT control inverter circuit.In an embodiment, described full-bridge inverter module comprises 4 triode V1-V4,4 backward dioded Vd1-Vd4,2 capacitor C 1, C2, and inductance L; The positive pole of backward dioded Vd1 is connected on the emitter of triode V1, and negative pole is connected on the collector of triode V1; The positive pole of backward dioded Vd2 is connected on the emitter of triode V2, and negative pole is connected on the collector of triode V2; The positive pole of backward dioded Vd3 is connected on the emitter of triode V3, and negative pole is connected on the collector of triode V3; The positive pole of backward dioded Vd4 is connected on the emitter of triode V4, and negative pole is connected on the collector of triode V4; Capacitor C1 is connected in parallel on the output head anode and negative pole of battery pack; The emitter of triode V1 is connected with the collector of triode V2, and is jointly connected to the input anode of current sample module; The collector of triode V1 is connected on the output head anode of battery pack, and the emitter of triode V2 is connected on the negative pole of output end of battery pack; The emitter of triode V3 is connected with the collector of triode V4, and is jointly connected to the input cathode of current sample module; The collector of triode V3 is connected on the output head anode of battery pack, and the emitter of triode V4 is connected on the negative pole of output end of battery pack; The emitter of triode V1 is connected and holds the positive pole that is connected power frequency isolating transformer primary side through inductance L with the collector of triode V2, and the emitter of triode V3 is connected and holds the negative pole that is directly connected power frequency isolating transformer primary side with the collector of triode V4; Capacitor C 2 is connected in parallel on the positive pole and negative pole of power frequency isolating transformer primary side.As shown in Figure 2, be that the full-bridge grid-connected inverter magnetic bias of the utility model produces schematic diagram, electric current I 1 flows to transformer through V1 as shown in the figure, then from transformer, flows out and after V4, enters accumulator, forms loop.In like manner, electric current I 2 flows to transformer after V3, then from transformer, flows out and after V2, enters accumulator, forms loop.As I1>I2 or I1<I2, flow to the electric current of transformer coil when unequal, will produce bias phenomenon.Therefore, in the utility model related magnetic bias to detect essence be whether detect the electric current of inflow transformer coil balanced.
Current sample module: formed by Hall current sensor, operational amplifier, current filter and A/D converter.Wherein the input end of Hall current sensor is connected on the input end of DC-DC transducer.The output terminal of Hall current sensor is connected to the input end of A/D converter successively through operational amplifier and current filter.The output terminal of A/D converter connects the input end of multinuclear processing module.Hall current sensor converts the current signal of inverter output to voltage signal, then through operation amplifier circuit amplification, filtering, export A/D conditioning module to, finally by the ADC in microcontroller, analog voltage signal is changed into digital signal, and carry out digital signal processing by microcontroller.The present embodiment adopts the Hall current sensor of TBC-DS25 series, and concrete model is CSM050NPT, and primary current measurement range is 0～150A.
A/D conditioning module: in analog-to-digital process, if send to the analog quantity of ADC to produce variation, its precision can be under some influence.In order to guarantee that the 0～5V ac voltage signal that enters microcontroller (MCU) can keep stable, need to before entering microcontroller, process alternating voltage, the effect of A/D modulate circuit is certain flashy value of Gather and input analog voltage, and can analog-to-digital time, keep stablizing of output voltage constant, analog to digital conversion can normally be carried out.The A/D conditioning module of the present embodiment adopts AD7718BRZ chip.
Micro controller module: micro controller module adopts a high speed ARM process chip, by the generation that control algolithm, filtering algorithm and pwm pulse signal are realized in microcontroller inside that is programmed in of program.The micro controller module of the present embodiment adopts STM32F103VET6 chip.
Power frequency isolating transformer module: transformer is by inverter 0～240V, and the output voltage that frequency of operation is 50HZ is converted into 0～5V.The present embodiment adopts the power frequency isolating transformer of German Moore (MURR) company, has more intense antijamming capability and higher precision.
As shown in Figure 3, it is the utility model microcontroller internal data handling principle block diagram, the correction producing by sef-adapting filter is controlled the output of PWM ripple, thereby the output of PWM ripple enters four road IGBT and drives the running status that changes IGBT, play the effect that regulates inverter loop electric current, thereby effectively eliminate bias phenomenon.
As shown in Figure 4, be the processing structural drawing of the utility model lattice filter, f
mand b (n)
m(n) be respectively the n subsequence of m level priori prediction errors and posteriori prediction errors,
with
n partial correlation coefficient of m level, m=1,2 ... .n.M is M joint lattice filter, and x (n) is input vector, i.e. actual output voltage after A/D conditioning module.
As shown in Figure 5, it is the utility model gradient adaptive lattice filter Combined Treatment structure, by lattice filter and linear adaption LMS wave filter, formed, d (n) is comprised of useful signal and noise signal, it is the wanted signal of this gradient adaptive lattice type filtering system, linear adaption LMS wave filter has two-way input, comprises the backward output signal b of lattice filter
m(n) and wanted signal d (n) form, wherein, m=1,2 ... .n.Linear adaption LMS coefficients w
i(n) represent the coefficient of tap signal weighting, wave filter final output signal is input signal b
i(n) with shock response sequence w
i(n) convolution and, e
i(n) be the difference of priori prediction errors and posteriori prediction errors, i.e. error signal, the joint number that i is wave filter, passes through e
i(n) adjust coefficients w
i(n) adjust b
m(n) output, reaches adaptive object.The subordinate of Combined Treatment structure adopts linear adaption LMS algorithm to control the coefficient w of tap signal weighting
i(n), the joint number of LMS sef-adapting filter is than the many joints of lattice filter, last e
m+1(n) be system output signal, native system makes tap signal make mutually not disturb between signal by the orthogonalization process of lattice filter, and calculated amount is less.
Claims (5)
1. photovoltaic combining inverter magnetic bias pick-up unit, is characterized in that: mainly voltage load module, full-bridge inverter module, current sample module, A/D conditioning module, micro controller module, power frequency isolating transformer module, consist of; Wherein voltage load module comprises solar panel array and battery pack, the output terminal of solar panel array connects the input end of battery pack, the output terminal of battery pack connects the primary side of power frequency isolating transformer via full-bridge inverter module, the out secondary of power frequency isolating transformer is connected with load; The input end of current sample module is connected on the signals collecting end of full-bridge inverter module, the output terminal of current sample module is connected with the input end of micro controller module through A/D conditioning module, and the output terminal of micro controller module connects the signal controlling end of full-bridge inverter module.
2. photovoltaic combining inverter magnetic bias pick-up unit according to claim 1, is characterized in that: described full-bridge inverter module comprises 4 triode V1-V4,4 backward dioded Vd1-Vd4,2 capacitor C 1, C2, and inductance L; The positive pole of backward dioded Vd1 is connected on the emitter of triode V1, and negative pole is connected on the collector of triode V1; The positive pole of backward dioded Vd2 is connected on the emitter of triode V2, and negative pole is connected on the collector of triode V2; The positive pole of backward dioded Vd3 is connected on the emitter of triode V3, and negative pole is connected on the collector of triode V3; The positive pole of backward dioded Vd4 is connected on the emitter of triode V4, and negative pole is connected on the collector of triode V4; Capacitor C1 is connected in parallel on the output head anode and negative pole of battery pack; The emitter of triode V1 is connected with the collector of triode V2, and is jointly connected to the input anode of current sample module; The collector of triode V1 is connected on the output head anode of battery pack, and the emitter of triode V2 is connected on the negative pole of output end of battery pack; The emitter of triode V3 is connected with the collector of triode V4, and is jointly connected to the input cathode of current sample module; The collector of triode V3 is connected on the output head anode of battery pack, and the emitter of triode V4 is connected on the negative pole of output end of battery pack; The emitter of triode V1 is connected and holds the positive pole that is connected power frequency isolating transformer primary side through inductance L with the collector of triode V2, and the emitter of triode V3 is connected and holds the negative pole that is directly connected power frequency isolating transformer primary side with the collector of triode V4; Capacitor C 2 is connected in parallel on the positive pole and negative pole of power frequency isolating transformer primary side.
3. photovoltaic combining inverter magnetic bias pick-up unit according to claim 2, is characterized in that: described 4 triode V1-V4 are insulated gate bipolar transistor.
4. photovoltaic combining inverter magnetic bias pick-up unit according to claim 1, is characterized in that: described current sample module comprises Hall current sensor, operational amplifier, current filter and A/D converter; Wherein the input end of Hall current sensor is connected on the input end of DC-DC transducer; The output terminal of Hall current sensor is connected the input end of A/D converter successively with current filter through operational amplifier; The output terminal of A/D converter connects the input end of multinuclear processing module.
5. photovoltaic combining inverter magnetic bias pick-up unit according to claim 1, is characterized in that: described micro controller module is ARM process chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320309074.4U CN203422418U (en) | 2013-05-31 | 2013-05-31 | Bias detection device for photovoltaic grid-connected inverter |
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| CN201320309074.4U CN203422418U (en) | 2013-05-31 | 2013-05-31 | Bias detection device for photovoltaic grid-connected inverter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103941699A (en) * | 2014-04-28 | 2014-07-23 | 浙江艾罗电源有限公司 | Inverter for energy-storage type photovoltaic grid-connected system |
| CN108802535A (en) * | 2018-06-27 | 2018-11-13 | 全球能源互联网研究院有限公司 | Screening technique, dominant interferer recognition methods and device, server and storage medium |
-
2013
- 2013-05-31 CN CN201320309074.4U patent/CN203422418U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103941699A (en) * | 2014-04-28 | 2014-07-23 | 浙江艾罗电源有限公司 | Inverter for energy-storage type photovoltaic grid-connected system |
| CN103941699B (en) * | 2014-04-28 | 2016-06-08 | 浙江艾罗电源有限公司 | Inverter for accumulation energy type photovoltaic parallel in system |
| CN108802535A (en) * | 2018-06-27 | 2018-11-13 | 全球能源互联网研究院有限公司 | Screening technique, dominant interferer recognition methods and device, server and storage medium |
| CN108802535B (en) * | 2018-06-27 | 2020-06-26 | 全球能源互联网研究院有限公司 | Screening method, main interference source identification method and device, server and storage medium |
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Granted publication date: 20140205 Termination date: 20140531 |