CN108562779A - The analysis of transport and placing device input pin signal, control method in the line voltage sample circuit of non-isolated photovoltaic DC-to-AC converter - Google Patents
The analysis of transport and placing device input pin signal, control method in the line voltage sample circuit of non-isolated photovoltaic DC-to-AC converter Download PDFInfo
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- CN108562779A CN108562779A CN201711347057.9A CN201711347057A CN108562779A CN 108562779 A CN108562779 A CN 108562779A CN 201711347057 A CN201711347057 A CN 201711347057A CN 108562779 A CN108562779 A CN 108562779A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
Abstract
The invention discloses a kind of transport and placing device input pin signal analysis methods of non-isolated photovoltaic DC-to-AC converter, network voltage and system common-mode voltage to the voltage that transport and placing device input pin acts on quantify equivalent, the signals security model that transport and placing device input pin is acted on by network voltage and system common-mode voltage is built, obtains the equivalent inpnt signal of transport and placing device input pin to judge whether input voltage exceeds safe input voltage range.Based on this, the invention also discloses a kind of transport and placing device input pin signal control methods of non-isolated photovoltaic DC-to-AC converter, it is carried out after introducing regulation resistance R3 in the line voltage sample circuit of the non-isolated photovoltaic DC-to-AC converter equivalent, value by adjusting the regulation resistance R3 makes the equivalent inpnt signal of transport and placing device input pin within the scope of safe voltage, the input pin risk that may be present beyond safe voltage range can be effectively eliminated, while can guarantee the voltage sample precision of non-isolated inverter line voltage sample circuit again.
Description
Technical field
The present invention relates to field of photovoltaic power generation, and in particular to a kind of line voltage sample circuit of non-isolated photovoltaic DC-to-AC converter
Middle transport and placing device（That is operational amplifier is referred to as transport and placing device in of the invention）The analysis of input pin signal, control method.
Background technology
Under the global context of energy shortage and environmental degradation, it is particularly important using new clean energy resource, solar energy
It is renewable with its, resourceful to be widely deployed and apply.
The current own relative maturity of photovoltaic power generation technology, but with product field application increase and accumulated time, some this
It is also opposite emergence the problem of ignoring, and has obtained the attention of industry.And non-isolated photovoltaic DC-to-AC converter line voltage sample circuit
In since network voltage and system common-mode voltage act on issuable amplifier input pin input voltage signal security risk be exactly
One of problem.
In order to realize the sampling precision of network voltage, the ratio of line voltage sample circuit is in inverter design mostly with mark
Sample range of the maximum value with respect to DSP of the network voltage of work is claimed to convert.And this relatively done with high accuracy power grid electricity
The circuit parameter for pressing sampling, the electricity in the influence that system common-mode voltage acts under considering network voltage independent role and various operating modes
There may be the risks beyond safe voltage range for the input pin of operational amplifier in road.How network voltage sampling is being taken into account
It is meaningful that input pin is effectively eliminated while precision there may be the risk beyond safe voltage range.
Invention content
In view of the above technical problems, the present invention provides in a kind of line voltage sample circuit of non-isolated photovoltaic DC-to-AC converter
Transport and placing device input pin signal analysis method, it is equivalent go out network voltage and system common-mode voltage to non-isolated photovoltaic DC-to-AC converter power grid electricity
Operational amplifier input pin signals security voltage model in sample circuit is pressed, realizes the amount of input pin signal voltage under various operating modes
Change；And it is based on this, a kind of transport and placing device input pin signal control method of non-isolated photovoltaic DC-to-AC converter is additionally provided, can be effectively eliminated
The input pin risk that may be present beyond safe voltage range, while can guarantee non-isolated inverter network voltage sampling electricity again
The voltage sample precision on road.
In order to achieve the above objectives, a kind of technical solution that the present invention uses for：
Transport and placing device input pin signal analysis method in a kind of line voltage sample circuit of non-isolated photovoltaic DC-to-AC converter, by power grid electricity
Pressure and system common-mode voltage to the voltage that transport and placing device input pin act on quantify equivalent, and structure transport and placing device input pin is electric by power grid
The signals security model of pressure and system common-mode voltage effect obtains the equivalent inpnt signal of transport and placing device input pin to judge input electricity
Whether pressure exceeds safe input voltage range.
In some embodiments, the network voltage and system common-mode voltage are by power grid phase power supply, the equivalent friendship of common-mode voltage
Galvanic electricity source, the progress of common-mode voltage Equivalent DC power supply are equivalent, by configuring the power grid phase power supply, common-mode voltage equivalent AC electricity
Source, common-mode voltage Equivalent DC power supply value obtain the equivalent inpnt signal of transport and placing device input pin under different operating modes.
In some embodiments, network voltage amplifier ratio be R2/R1, two input pins of the transport and placing device etc.
It is respectively R2/ (R1+R2) * (U1+U2+U3) and R2/ (R1+R2) * (U1+U2) to imitate input signal, wherein R1, R1, Zcy distinguish
It is used as the equivalent resistance and equivalent capacity of the partial pressure device in the signals security model, U1, U2, U3 indicate common mode respectively
Voltage equivalent AC power supply, common-mode voltage Equivalent DC power supply, power grid phase power supply, Zcy indicate PV lateral capacitances in network operation frequency
Capacitive reactance under rate.
In some embodiments, the different operating modes, which include the sides PV, has input operating mode, the sides PV without input operating mode, grid-connected work
At least two in condition, not grid-connected operating mode.
The another technical solution that the present invention uses is as follows：
Transport and placing device input pin signal control method in a kind of line voltage sample circuit of non-isolated photovoltaic DC-to-AC converter, described non-
It is isolated in the line voltage sample circuit of photovoltaic DC-to-AC converter and introduces regulation resistance R3；By network voltage and system common-mode voltage to fortune
The voltage for putting the effect of device input pin quantify equivalent, and structure transport and placing device input pin is acted on by network voltage and system common-mode voltage
Signals security model, the regulation resistance R3 in the signals security model as introduce transport and placing device input pin signal point
Voltage device, the value by adjusting the regulation resistance R3 make the equivalent inpnt signal of transport and placing device input pin in safe voltage range
It is interior.
In some embodiments, the network voltage and system common-mode voltage are by power grid phase power supply, the equivalent friendship of common-mode voltage
Galvanic electricity source, the progress of common-mode voltage Equivalent DC power supply are equivalent, by configuring the power grid phase power supply, common-mode voltage equivalent AC electricity
Source, common-mode voltage Equivalent DC power supply value obtain the equivalent inpnt signal of transport and placing device input pin under different operating modes.
In some embodiments, network voltage amplifier ratio be R2/R1, two input pins of the transport and placing device etc.
It is respectively (R2//R3)/(R1+ (R2//R3)) * (U1+U2+U3) and (R2//R3)/(R1+ (R2//R3)) * (U1 to imitate input signal
+ U2), wherein R1, R1, Zcy are used as the equivalent resistance of the partial pressure device in the signals security model and equivalent electricity respectively
Hold, U1, U2, U3 indicate common-mode voltage equivalent AC power supply, common-mode voltage Equivalent DC power supply, power grid phase power supply, Zcy tables respectively
Show capacitive reactance of the PV lateral capacitances under network operation frequency.
In some embodiments, network voltage of the line voltage sample circuit after introducing the regulation resistance R3 is adopted
Sample magnification ratio is consistent with the oversampling ratio of the network voltage.
In some embodiments, the different operating modes, which include the sides PV, has input operating mode, the sides PV without input operating mode, grid-connected work
At least two in condition, not grid-connected operating mode.
The present invention uses above scheme, has the following advantages that compared with prior art：
The present invention provides operational amplifiers in a kind of fully differential line voltage sample circuit for non-isolated photovoltaic DC-to-AC converter
Input pin signal analysis method, by build transport and placing device input pin safety signal model in the model can be by setting
The input pin signal that the energy such as the value of network voltage and system common-mode voltage dissolve transport and placing device is set, realizes the assessment of input pin signal
And in model each parameter effect analysis, especially judge input voltage whether exceed safe input voltage range.
The present invention also provides transport and placing devices in a kind of line voltage sample circuit for non-isolated photovoltaic DC-to-AC converter to input
Foot signal control method is adjusted by being introduced respectively on the transport and placing device input pin in the sample circuit of non-isolated photovoltaic DC-to-AC converter
Resistance builds the input pin safety signal model after introducing regulation resistance, by adjusting regulation resistance based on above-mentioned analysis method
Value make operational amplifier input pin signal control in safe range, effectively eliminate input pin it is that may be present beyond safety
The risk of voltage range, and can guarantee the voltage sample precision of line voltage sample circuit, it will not be to network voltage sample range
It impacts.
Description of the drawings
It, below will be to attached drawing needed in embodiment description in order to illustrate more clearly of technical scheme of the present invention
It is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, general for this field
For logical technical staff, without creative efforts, other drawings may also be obtained based on these drawings.
Fig. 1 is a kind of signal of the fully differential line voltage sample circuit of non-isolated photovoltaic DC-to-AC converter in the prior art
Figure；
Fig. 2 shows a kind of sampling electricity corresponding to Fig. 1 of transport and placing device input pin signal analysis method structure according to the present invention
The signals security model of the transport and placing device input pin on road；
Fig. 3 is the non-isolated photovoltaic DC-to-AC converter network voltage sampling electricity using the transport and placing device input pin signal control method of the present invention
The schematic diagram on road；
Fig. 4 shows the sample circuit corresponding to Fig. 3 of transport and placing device input pin signal control method structure according to the present invention
The safety signal model of transport and placing device input pin.
Specific implementation mode
The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that advantages and features of the invention energy
It is easier to be understood by the person skilled in the art.It should be noted that the explanation for these embodiments is used to help
Understand the present invention, but does not constitute limitation of the invention.In addition, involved in the various embodiments of the present invention described below
And to technical characteristic can be combined with each other as long as they do not conflict with each other.
Embodiment 1
Fig. 1 show a kind of fully differential line voltage sample circuit of non-isolated photovoltaic DC-to-AC converter, and the present embodiment is intended to provide one
The method that kind carries out analysis and assessment to the input pin signal of the operational amplifier in the line voltage sample circuit.Non-isolated photovoltaic
The input pin signal analysis method of operational amplifier in the fully differential sample circuit of inverter network voltage includes：By power grid electricity
Pressure and system common-mode voltage to the voltage that transport and placing device input pin act on quantify equivalent, and structure transport and placing device input pin is electric by power grid
The signals security model of pressure and system common-mode voltage effect；I.e. by the signals security mould for being equivalent to Fig. 2 of the sample circuit in Fig. 1
Type.In the signals security model, consider network voltage and system common-mode voltage to operational amplifier input pin in sample circuit
Effect, obtain transport and placing device input pin equivalent inpnt signal, with this assess operational amplifier input pin in this role whether
Input voltage that may be present exceeds the risk of safe voltage range.
Specifically, as shown in Fig. 2, the network voltage and system common-mode voltage are equivalent by power grid phase power supply, common-mode voltage
AC power, the progress of common-mode voltage Equivalent DC power supply are equivalent, by configuring the power grid phase power supply, common-mode voltage equivalent AC
Power supply, common-mode voltage Equivalent DC power supply value obtain the equivalent inpnt signal of transport and placing device input pin under different operating modes.It is described not
With operating mode including the sides PV has input operating mode, the sides PV without input operating mode, grid-connected operating mode, not grid-connected operating mode etc., and whether there is or not inputs for the sides PV, and
Net can be by configuring three power supplys from the signals security voltage of operational amplifier input pin under the different operating modes such as not grid-connected
Value carry out it is equivalent.In Fig. 2, R1, R1, Zcy are used as the equivalent resistance of the partial pressure device in the signals security model respectively
And equivalent capacity, U1, U2, U3 indicate common-mode voltage equivalent AC power supply, common-mode voltage Equivalent DC power supply, power grid phase respectively
Power supply, Zcy indicate capacitive reactance of the PV side Y capacitances under network operation frequency.
Network voltage amplifier ratio in Fig. 1 is R2/R1, after equivalent, the input pin 1 of transport and placing device it is equivalent defeated
It is R2/ (R1+R2) * (U1+U2+U3) to enter signal, and the equivalent inpnt signal of the input pin 2 of transport and placing device is R2/ (R1+R2) * (U1+
U2).Each parameter effect in transport and placing device input pin signal and analysis equivalent model is assessed by the equivalent input signal, in turn
Power grid phase power supply, common-mode voltage equivalent AC power supply, the value of common-mode voltage Equivalent DC power supply and short-circuit shape can be accordingly set
State.
Embodiment 2
Based on the analysis method of embodiment 1, the present embodiment provides a kind of line voltage sample circuits of non-isolated photovoltaic DC-to-AC converter
And transport and placing device input pin signal control method in line voltage sample circuit.As shown in figure 3, non-isolated photovoltaic shown in Fig. 1
Introducing regulation resistance R3, regulation resistance R3 are introduced in transport and placing device respectively in the line voltage sample circuit of inverter two are defeated
Enter on foot.Then, network voltage and system common-mode voltage to the voltage that transport and placing device input pin acts on quantify equivalent, structure
The signals security model that transport and placing device input pin is acted on by network voltage and system common-mode voltage, is such as adjusted introducing shown in Fig. 3
Sample circuit after resistance R3 is equivalent to transport and placing device input pin safety signal model shown in Fig. 4, in the safety signal model, adjusts
Economize on electricity resistance R3 is in parallel with equivalent resistance R2, and regulation resistance R3 is in the signals security model as introducing transport and placing device input pin letter
Number partial pressure device.Value by adjusting the regulation resistance R3 makes the equivalent inpnt signal of transport and placing device input pin in safe voltage
In range.The network voltage and system common-mode voltage are specifically by power grid phase power supply, common-mode voltage equivalent AC power supply, common mode electricity
Equivalent DC power supply is pressed to carry out equivalent, by configuring the power grid phase power supply, common-mode voltage equivalent AC power supply, common-mode voltage etc.
The value of effect DC power supply obtains the equivalent inpnt signal of transport and placing device input pin under different operating modes.The difference operating mode, which includes the sides PV, to be had
Operating mode, the sides PV are inputted without input operating mode, grid-connected operating mode, not grid-connected operating mode etc., the sides PV whether there is or not input, it is grid-connected from it is not grid-connected etc. different
The signals security voltage of operational amplifier input pin can be equivalent by configuring the value progress of three power supplys under operating mode.
Specifically, in the signals security model shown in Fig. 4, the equivalent inpnt signal of transport and placing device input pin 1 be (R2//
R3)/(R1+ (R2//R3)) * (U1+U2+U3), the equivalent inpnt signal of transport and placing device input pin 2 be (R2//R3)/(R1+ (R2//
R3))*(U1+U2).It the equivalent resistance for the partial pressure device that R1, R1, Zcy are used as respectively in the signals security model and waits
Capacitance is imitated, U1, U2, U3 indicate common-mode voltage equivalent AC power supply, common-mode voltage Equivalent DC power supply, power grid phase power supply respectively,
Zcy indicates capacitive reactance of the PV lateral capacitances under network operation frequency.
It should also be noted that, after introducing regulation resistance R3 in line voltage sample circuit, the power grid electricity of sample circuit
Pressure amplifier ratio remains as R2/R1, consistent with the oversampling ratio of the network voltage.Therefore it is flexible various operating modes can be integrated
Adjust the value of regulation resistance R3, sample range and sampling precision without influencing whether network voltage.
The above embodiments merely illustrate the technical concept and features of the present invention, is a kind of preferred embodiment, its object is to ripe
The personage for knowing technique cans understand the content of the present invention and implement it accordingly, and the protection model of the present invention can not be limited with this
It encloses.Equivalent transformation or modification made by all Spirit Essences according to the present invention, should be covered by the protection scope of the present invention.
Claims (9)
1. transport and placing device input pin signal analysis method in a kind of line voltage sample circuit of non-isolated photovoltaic DC-to-AC converter, feature
It is, network voltage and system common-mode voltage to the voltage that transport and placing device input pin acts on quantify equivalent, structure transport and placing device
The signals security model that input pin is acted on by network voltage and system common-mode voltage obtains the equivalent inpnt letter of transport and placing device input pin
Number with judge input voltage whether exceed safe input voltage range.
2. transport and placing device input pin signal analysis method, feature exist in line voltage sample circuit according to claim 1
In the network voltage and system common-mode voltage are equivalent straight by power grid phase power supply, common-mode voltage equivalent AC power supply, common-mode voltage
The progress of galvanic electricity source is equivalent, by configuring the power grid phase power supply, common-mode voltage equivalent AC power supply, common-mode voltage Equivalent DC electricity
The value in source obtains the equivalent inpnt signal of transport and placing device input pin under different operating modes.
3. transport and placing device input pin signal analysis method, feature exist in line voltage sample circuit according to claim 2
In network voltage amplifier ratio is R2/R1, and the equivalent inpnt signal of two input pins of the transport and placing device is respectively R2/
(R1+R2) * (U1+U2+U3) and R2/ (R1+R2) * (U1+U2), wherein R1, R1, Zcy are used as the signals security mould respectively
The equivalent resistance and equivalent capacity of partial pressure device in type, U1, U2, U3 indicate common-mode voltage equivalent AC power supply, are total to respectively
Mode voltage Equivalent DC power supply, power grid phase power supply, Zcy indicate capacitive reactance of the PV lateral capacitances under network operation frequency.
4. transport and placing device input pin signal analysis method, feature exist in line voltage sample circuit according to claim 2
In, difference operating modes include the sides PV have input operating mode, the sides PV without input operating mode, grid-connected operating mode, in not grid-connected operating mode at least
Two kinds.
5. transport and placing device input pin signal control method in a kind of line voltage sample circuit of non-isolated photovoltaic DC-to-AC converter, feature
It is, regulation resistance R3 is introduced in the line voltage sample circuit of the non-isolated photovoltaic DC-to-AC converter；By network voltage and it is
Altogether mode voltage to the voltage that transport and placing device input pin acts on quantify equivalent, and structure transport and placing device input pin by network voltage and is
The altogether signals security model of mode voltage effect, the regulation resistance R3 is in the signals security model as introducing transport and placing device
The partial pressure device of input pin signal, the value by adjusting the regulation resistance R3 make the equivalent inpnt signal of transport and placing device input pin exist
Within the scope of safe voltage.
6. transport and placing device input pin signal control method, feature exist in line voltage sample circuit according to claim 5
In the network voltage and system common-mode voltage are equivalent straight by power grid phase power supply, common-mode voltage equivalent AC power supply, common-mode voltage
The progress of galvanic electricity source is equivalent, by configuring the power grid phase power supply, common-mode voltage equivalent AC power supply, common-mode voltage Equivalent DC electricity
The value in source obtains the equivalent inpnt signal of transport and placing device input pin under different operating modes.
7. transport and placing device input pin signal control method, feature exist in line voltage sample circuit according to claim 6
In network voltage amplifier ratio is R2/R1, and the equivalent inpnt signal of two input pins of the transport and placing device is respectively
(R2//R3)/(R1+ (R2//R3)) * (U1+U2+U3) and (R2//R3)/(R1+ (R2//R3)) * (U1+U2), wherein R1, R1,
Zcy is used as the equivalent resistance and equivalent capacity of the partial pressure device in the signals security model, U1, U2, U3 difference respectively
Indicate that common-mode voltage equivalent AC power supply, common-mode voltage Equivalent DC power supply, power grid phase power supply, Zcy indicate PV lateral capacitances in electricity
Capacitive reactance under net working frequency.
8. transport and placing device input pin signal control method, feature exist in line voltage sample circuit according to claim 7
In network voltage amplifier ratio of the line voltage sample circuit after introducing the regulation resistance R3 and the power grid
The oversampling ratio of voltage is consistent.
9. transport and placing device input pin signal control method, feature exist in line voltage sample circuit according to claim 6
In, difference operating modes include the sides PV have input operating mode, the sides PV without input operating mode, grid-connected operating mode, in not grid-connected operating mode at least
Two kinds.
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| CN201711347057.9A CN108562779B (en) | 2017-12-15 | 2017-12-15 | Method for analyzing and controlling signals of input pin of operational amplifier in photovoltaic inverter power grid sampling |
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| CN201711347057.9A CN108562779B (en) | 2017-12-15 | 2017-12-15 | Method for analyzing and controlling signals of input pin of operational amplifier in photovoltaic inverter power grid sampling |
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Address after: 200000 room 905b, 757 Mengzi Road, Huangpu District, Shanghai Patentee after: Elsevier Technology Co.,Ltd. Address before: 200000 room 905b, 757 Mengzi Road, Huangpu District, Shanghai Patentee before: Asway Technology (Shanghai) Co.,Ltd. |
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