CN108562779B - Method for analyzing and controlling signals of input pin of operational amplifier in photovoltaic inverter power grid sampling - Google Patents
Method for analyzing and controlling signals of input pin of operational amplifier in photovoltaic inverter power grid sampling Download PDFInfo
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Abstract
The invention discloses a signal analysis method for an input pin of an operational amplifier of a non-isolated photovoltaic inverter, which comprises the steps of quantifying and equivalence of power grid voltage and system common-mode voltage on the voltage acted on the input pin of the operational amplifier, constructing a signal safety model of the input pin of the operational amplifier acted by the power grid voltage and the system common-mode voltage, and obtaining an equivalent input signal of the input pin of the operational amplifier to judge whether the input voltage exceeds a safety input voltage range. Based on the above, the invention also discloses a signal control method for the input pin of the operational amplifier of the non-isolated photovoltaic inverter, wherein the equivalent is carried out after the adjustment resistor R3 is introduced into the grid voltage sampling circuit of the non-isolated photovoltaic inverter, and the value of the adjustment resistor R3 is adjusted to enable the equivalent input signal of the input pin of the operational amplifier to be within the safe voltage range, so that the risk that the input pin possibly exceeds the safe voltage range can be effectively eliminated, and the voltage sampling precision of the grid voltage sampling circuit of the non-isolated photovoltaic inverter can be ensured.
Description
Technical Field
The invention relates to the field of photovoltaic power generation, in particular to a method for analyzing and controlling signals of an input pin of an operational amplifier (namely an operational amplifier, which is simply referred to as an operational amplifier) in a power grid voltage sampling circuit of a non-isolated photovoltaic inverter.
Background
Under the global background of energy shortage and environmental deterioration, the utilization of new clean energy is very important, and solar energy is widely developed and applied due to the renewable property and abundant resources.
The current photovoltaic power generation technology is relatively mature, but with the increase of product field application and time accumulation, some problems which are ignored are relatively emergent, and the industry pays attention to the problems. One of the problems is the safety risk of the input voltage signal of the operational amplifier input pin, which may be generated due to the grid voltage and the system common-mode voltage in the non-isolated photovoltaic inverter grid voltage sampling circuit.
In order to achieve the sampling accuracy of the grid voltage, the ratio of the grid voltage sampling circuit is often converted in the inverter design from the maximum value of the nominally operating grid voltage to the sampling range of the DSP. The circuit parameters for realizing the grid voltage sampling with higher precision have the risk that the input pin of the operational amplifier in the circuit possibly exceeds the safe voltage range when the influence of the independent action of the grid voltage and the action of the common-mode voltage of the system under various working conditions is considered. It is significant how to effectively eliminate the risk that the input pin may be out of the safe voltage range while taking into account the grid voltage sampling accuracy.
Disclosure of Invention
Aiming at the technical problem, the invention provides a method for analyzing the input pin signal of an operational amplifier in a power grid voltage sampling circuit of a non-isolated photovoltaic inverter, which is used for equivalently obtaining a safe voltage model of the power grid voltage and the system common-mode voltage on the input pin signal of the operational amplifier in the power grid voltage sampling circuit of the non-isolated photovoltaic inverter, and realizing the quantification of the input pin signal voltage under various working conditions; based on the method, the risk that the input pin possibly exceeds a safe voltage range can be effectively eliminated, and the voltage sampling precision of the power grid voltage sampling circuit of the non-isolated photovoltaic inverter can be guaranteed.
In order to achieve the purpose, the invention adopts a technical scheme that:
a method for analyzing signals of an input pin of an operational amplifier in a power grid voltage sampling circuit of a non-isolated photovoltaic inverter comprises the steps of quantifying and equivalence of power grid voltage and system common-mode voltage on the voltage acted on the input pin of the operational amplifier, constructing a signal safety model of the input pin of the operational amplifier acted by the power grid voltage and the system common-mode voltage, and obtaining an equivalent input signal of the input pin of the operational amplifier to judge whether the input voltage exceeds a safety input voltage range.
In some embodiments, the power grid voltage and the system common-mode voltage are equivalent by a power grid phase power supply, a common-mode voltage equivalent alternating current power supply and a common-mode voltage equivalent direct current power supply, and the values of the power grid phase power supply, the common-mode voltage equivalent alternating current power supply and the common-mode voltage equivalent direct current power supply are configured to obtain equivalent input signals of input pins of the operational amplifier under different working conditions.
In some embodiments, the grid voltage sampling amplification ratio is R2/R1, and equivalent input signals of two input pins of the operational amplifier are R2/(R1+ R2) ((U1 + U2+ U3) and R2/(R1+ R2) ((U1 + U2), respectively, where R1 and R2 respectively represent equivalent resistances of the operational amplifier in the signal safety model, U1, U2 and U3 respectively represent a common-mode voltage equivalent alternating current power supply, a common-mode voltage equivalent direct current power supply and a grid-phase power supply, and Zcy represents a capacitive reactance of a PV-side capacitor at a grid operating frequency.
In some embodiments, the different operating conditions include at least two of a PV side input operating condition, a PV side no input operating condition, a grid-connected operating condition, and a grid-disconnected operating condition.
The other technical scheme adopted by the invention is as follows:
a signal control method for an input pin of an operational amplifier in a grid voltage sampling circuit of a non-isolated photovoltaic inverter is characterized in that a regulating resistor R3 is introduced into the grid voltage sampling circuit of the non-isolated photovoltaic inverter; the voltage of the input pin of the operational amplifier is quantified and equivalent by the power grid voltage and the system common-mode voltage, a signal safety model of the input pin of the operational amplifier under the action of the power grid voltage and the system common-mode voltage is constructed, the adjusting resistor R3 is used as a voltage divider for introducing the signal of the input pin of the operational amplifier in the signal safety model, and the equivalent input signal of the input pin of the operational amplifier is in a safety voltage range by adjusting the value of the adjusting resistor R3.
In some embodiments, the power grid voltage and the system common-mode voltage are equivalent by a power grid phase power supply, a common-mode voltage equivalent alternating current power supply and a common-mode voltage equivalent direct current power supply, and the values of the power grid phase power supply, the common-mode voltage equivalent alternating current power supply and the common-mode voltage equivalent direct current power supply are configured to obtain equivalent input signals of input pins of the operational amplifier under different working conditions.
In some embodiments, the grid voltage sampling amplification ratio is R2/R1, equivalent input signals of two input pins of the operational amplifier are (R2// R3)/(R1+ (R2// R3)) (U1+ U2+ U3) and (R2// R3)/(R1+ (R2// R3)) (U1+ U2), U1, U2, and U3 respectively represent common-mode voltage equivalent alternating current power, common-mode voltage equivalent direct current power, and grid phase power, and Zcy represents the capacitive reactance of the PV-side capacitor at the grid operating frequency.
In some embodiments, the grid voltage sampling amplification ratio of the grid voltage sampling circuit after the regulating resistor R3 is introduced is consistent with the sampling ratio of the grid voltage.
In some embodiments, the different operating conditions include at least two of a PV side input operating condition, a PV side no input operating condition, a grid-connected operating condition, and a grid-disconnected operating condition.
Compared with the prior art, the invention has the following advantages by adopting the scheme:
the invention provides an input pin signal analysis method of an operational amplifier in a fully differential power grid voltage sampling circuit for a non-isolated photovoltaic inverter.
The invention also provides a signal control method for the input pin of the operational amplifier in the grid voltage sampling circuit of the non-isolated photovoltaic inverter, which comprises the steps of respectively introducing adjusting resistors into the input pins of the operational amplifier in the sampling circuit of the non-isolated photovoltaic inverter, constructing an input pin safety signal model after introducing the adjusting resistors based on the analysis method, and controlling the input pin signals of the operational amplifier within a safety range by adjusting the value of the adjusting resistors, thereby effectively eliminating the possible risk that the input pins exceed the safety voltage range, ensuring the voltage sampling precision of the grid voltage sampling circuit and not influencing the grid voltage sampling range.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic diagram of a fully differential grid voltage sampling circuit of a non-isolated photovoltaic inverter in the prior art;
FIG. 2 shows a signal safety model of an input pin of an op-amp corresponding to the sampling circuit of FIG. 1, constructed according to a method for analyzing the signal of the input pin of the op-amp of the present invention;
FIG. 3 is a schematic diagram of a grid voltage sampling circuit of a non-isolated photovoltaic inverter applying the operational amplifier input pin signal control method of the present invention;
fig. 4 shows a safety signal model of an input pin of an op amp corresponding to the sampling circuit of fig. 3, constructed according to the signal control method of the input pin of the op amp of the present invention.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the invention may be more readily understood by those skilled in the art. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
Fig. 1 shows a fully differential grid voltage sampling circuit of a non-isolated photovoltaic inverter, and the present embodiment aims to provide a method for evaluating and analyzing an input pin signal of an operational amplifier in the grid voltage sampling circuit. The method for analyzing the input pin signal of the operational amplifier in the fully-differential sampling circuit of the grid voltage of the non-isolated photovoltaic inverter comprises the following steps: carrying out quantitative equivalence on the voltage acted by the input pin of the operational amplifier by the power grid voltage and the system common-mode voltage, and constructing a signal safety model of the input pin of the operational amplifier under the action of the power grid voltage and the system common-mode voltage; i.e. the sampling circuit in fig. 1 is equivalent to the signal safety model of fig. 2. In the signal safety model, the action of the power grid voltage and the system common mode voltage on the input pin of the operational amplifier in the sampling circuit is considered, and the equivalent input signal of the input pin of the operational amplifier is obtained, so that the risk that the input voltage possibly exists in the input pin of the operational amplifier under the action exceeds the safety voltage range is evaluated.
Specifically, as shown in fig. 2, the power grid voltage and the system common-mode voltage are equivalent by a power grid phase power supply, a common-mode voltage equivalent alternating current power supply, and a common-mode voltage equivalent direct current power supply, and the values of the power grid phase power supply, the common-mode voltage equivalent alternating current power supply, and the common-mode voltage equivalent direct current power supply are configured to obtain equivalent input signals of the input pin of the operational amplifier under different working conditions. The different working conditions comprise a PV side input working condition, a PV side non-input working condition, a grid-connected working condition, a grid-disconnected working condition and the like, the PV side input, and the signal safety voltage of the input pin of the operational amplifier under the different working conditions of grid connection, grid-disconnected and the like can be equivalent by configuring the values of the three power supplies. In fig. 2, R1 and R2 respectively represent equivalent resistances of the operational amplifier in the signal safety model, U1, U2 and U3 respectively represent a common-mode voltage equivalent alternating current power supply, a common-mode voltage equivalent direct current power supply and a power grid phase power supply, and Zcy represents a capacitive reactance of a PV-side Y capacitor at a power grid operating frequency.
The grid voltage sampling amplification ratio in fig. 1 is R2/R1, after equivalence, the equivalent input signal of the input pin 1 of the operational amplifier is R2/(R1+ R2) (U1+ U2+ U3), and the equivalent input signal of the input pin 2 of the operational amplifier is R2/(R1+ R2) (1 + U2). The input pin signals of the operational amplifier are evaluated through the equivalent input signals, the effect of each parameter in the equivalent model is analyzed, and then the values and the short-circuit state of the power grid phase power supply, the common-mode voltage equivalent alternating current power supply and the common-mode voltage equivalent direct current power supply can be correspondingly set.
Example 2
Based on the analysis method in embodiment 1, this embodiment provides a grid voltage sampling circuit of a non-isolated photovoltaic inverter and a method for controlling a signal of an input pin of an operational amplifier in the grid voltage sampling circuit. As shown in fig. 3, a regulating resistor R3 is introduced into the grid voltage sampling circuit of the non-isolated photovoltaic inverter shown in fig. 1, and the regulating resistors R3 are respectively introduced to two input pins of the operational amplifier. Then, the voltage acted by the input pin of the operational amplifier is quantized and equivalent by the power grid voltage and the system common mode voltage, a signal safety model of the input pin of the operational amplifier acted by the power grid voltage and the system common mode voltage is constructed, for example, a sampling circuit shown in fig. 3 after introducing the regulating resistor R3 is equivalent to the operational amplifier input pin safety signal model shown in fig. 4, in the safety signal model, the regulating resistor R3 is connected in parallel with the equivalent resistor R2, and the regulating resistor R3 is used as a voltage divider for introducing the signal of the input pin of the operational amplifier in the signal safety model. The equivalent input signal of the input pin of the operational amplifier is in a safe voltage range by adjusting the value of the adjusting resistor R3. The power grid voltage and the system common-mode voltage are equivalent by a power grid phase power supply, a common-mode voltage equivalent alternating current power supply and a common-mode voltage equivalent direct current power supply, and equivalent input signals of the input pin of the operational amplifier under different working conditions are obtained by configuring the values of the power grid phase power supply, the common-mode voltage equivalent alternating current power supply and the common-mode voltage equivalent direct current power supply. The different working conditions comprise a PV side input working condition, a PV side non-input working condition, a grid-connected working condition, a grid-disconnected working condition and the like, the PV side input, and the signal safety voltage of the input pin of the operational amplifier under the different working conditions of grid connection, grid-disconnected and the like can be equivalent by configuring the values of the three power supplies.
Specifically, in the signal safety model shown in fig. 4, the equivalent input signal of the input pin 1 of the operational amplifier is (R2// R3)/(R1+ (R2// R3)) (U1+ U2+ U3), and the equivalent input signal of the input pin 2 of the operational amplifier is (R2// R3)/(R1+ (R2// R3)) (U1+ U2). R1 and R2 respectively represent equivalent resistances of an operational amplifier in the signal safety model, U1, U2 and U3 respectively represent a common-mode voltage equivalent alternating current power supply, a common-mode voltage equivalent direct current power supply and a power grid phase power supply, and Zcy represents a capacitive reactance of a PV side capacitor at the working frequency of a power grid.
It should be further noted that, after the regulating resistor R3 is introduced into the grid voltage sampling circuit, the grid voltage sampling amplification ratio of the sampling circuit is still R2/R1, which is consistent with the sampling ratio of the grid voltage. Therefore, the value of the regulating resistor R3 can be flexibly adjusted by combining various working conditions without influencing the sampling range and the sampling precision of the grid voltage.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are preferred embodiments, which are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (9)
1. A signal analysis method for an input pin of an operational amplifier in a power grid voltage sampling circuit of a non-isolated photovoltaic inverter is characterized in that power grid voltage and system common-mode voltage are subjected to quantitative equivalence on voltage acted by the input pin of the operational amplifier, a signal safety model of the input pin of the operational amplifier under the action of the power grid voltage and the system common-mode voltage is constructed, and an equivalent input signal of the input pin of the operational amplifier is obtained to judge whether the input voltage exceeds a safety input voltage range.
2. The method for analyzing the signals of the input pins of the operational amplifier in the power grid voltage sampling circuit according to claim 1, wherein the power grid voltage and the system common mode voltage are equivalent by a power grid phase power supply, a common mode voltage equivalent alternating current power supply and a common mode voltage equivalent direct current power supply, and the equivalent input signals of the input pins of the operational amplifier under different working conditions are obtained by configuring the values of the power grid phase power supply, the common mode voltage equivalent alternating current power supply and the common mode voltage equivalent direct current power supply.
3. The method for analyzing the signals of the input pins of the operational amplifier in the grid voltage sampling circuit according to claim 2, wherein the grid voltage sampling amplification ratio is R2/R1, and equivalent input signals of two input pins of the operational amplifier are R2/(R1+ R2) (U1+ U2+ U3) and R2/(R1+ R2) (U1+ U2), respectively, wherein R1 and R2 represent equivalent resistances of the operational amplifier in the signal safety model, U1, U2 and U3 represent common-mode voltage equivalent alternating current power, common-mode voltage equivalent direct current power and grid phase power, respectively, and Zcy represents capacitive reactance of a PV-side capacitor at the grid operating frequency.
4. The method for analyzing the input pin signal of the operational amplifier in the grid voltage sampling circuit according to claim 2, wherein the different working conditions comprise at least two of a PV-side input working condition, a PV-side non-input working condition, a grid-connected working condition and a non-grid-connected working condition.
5. A signal control method for an input pin of an operational amplifier in a grid voltage sampling circuit of a non-isolated photovoltaic inverter is characterized in that a regulating resistor R3 is introduced into the grid voltage sampling circuit of the non-isolated photovoltaic inverter; the voltage of the input pin of the operational amplifier is quantified and equivalent by the power grid voltage and the system common-mode voltage, a signal safety model of the input pin of the operational amplifier under the action of the power grid voltage and the system common-mode voltage is constructed, the adjusting resistor R3 is used as a voltage divider for introducing the signal of the input pin of the operational amplifier in the signal safety model, and the equivalent input signal of the input pin of the operational amplifier is in a safety voltage range by adjusting the value of the adjusting resistor R3.
6. The method for controlling the input pin signal of the operational amplifier in the power grid voltage sampling circuit according to claim 5, wherein the power grid voltage and the system common mode voltage are equivalent by a power grid phase power supply, a common mode voltage equivalent alternating current power supply and a common mode voltage equivalent direct current power supply, and the equivalent input signals of the input pin of the operational amplifier under different working conditions are obtained by configuring the values of the power grid phase power supply, the common mode voltage equivalent alternating current power supply and the common mode voltage equivalent direct current power supply.
7. The method for controlling the input pin signal of the operational amplifier in the grid voltage sampling circuit according to claim 6, wherein the grid voltage sampling amplification ratio is R2/R1, and the equivalent input signals of the two input pins of the operational amplifier are (R2// R3)/(R1+ (R2// R3)) (U1+ U2+ U3) and (R2// R3)/(R1+ (R2// R3)) (U1+ U2), wherein R1 and R2 respectively represent the equivalent resistance of the operational amplifier in the signal safety model, U1, U2 and U3 respectively represent a common-mode voltage equivalent alternating current power supply, a common-mode voltage equivalent direct current power supply and a grid-phase power supply, and Zcy represents the capacitive reactance of the PV-side capacitance at the grid operating frequency.
8. The method for controlling the input pin signal of the operational amplifier in the grid voltage sampling circuit according to claim 7, wherein the grid voltage sampling amplification ratio of the grid voltage sampling circuit after the regulating resistor R3 is introduced is consistent with the sampling ratio of the grid voltage.
9. The method for controlling the input pin signal of the operational amplifier in the grid voltage sampling circuit according to claim 6, wherein the different working conditions comprise at least two of a PV-side input working condition, a PV-side non-input working condition, a grid-connected working condition and a non-grid-connected working condition.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101409516A (en) * | 2008-07-16 | 2009-04-15 | 杭州中信网络自动化有限公司 | Simple network-connecting generation inverter |
| CN202486207U (en) * | 2012-03-23 | 2012-10-10 | 天宝电子（惠州）有限公司 | Three phrase network voltage sampling module of a photovoltaic inverter and wind energy convertor system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7167692B2 (en) * | 2004-03-16 | 2007-01-23 | Broadcom Corporation | High frequency peak detector and applications thereof |
| CN201741567U (en) * | 2009-12-04 | 2011-02-09 | 深圳市创银实业有限公司 | Electronic type current transformer with signal conditioning circuit |
| CN202110220U (en) * | 2011-06-23 | 2012-01-11 | 广东易事特电源股份有限公司 | Ground insulation resistance online detecting system for photovoltaic grid-connected inverter |
| CN102830334B (en) * | 2012-08-12 | 2015-05-20 | 江苏旭源科技有限公司 | Novel photovoltaic grid-connected inverter insulation detection circuit and detection method thereof |
| CN202720310U (en) * | 2012-08-12 | 2013-02-06 | 江苏旭源科技有限公司 | Novel photovoltaic grid-connected inverter insulation detection circuit |
-
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101409516A (en) * | 2008-07-16 | 2009-04-15 | 杭州中信网络自动化有限公司 | Simple network-connecting generation inverter |
| CN202486207U (en) * | 2012-03-23 | 2012-10-10 | 天宝电子（惠州）有限公司 | Three phrase network voltage sampling module of a photovoltaic inverter and wind energy convertor system |
Non-Patent Citations (1)
| Title |
|---|
| A probabilistic framework for evaluating voltage unbalance mitigation by photovoltaic inverters;VasilikiKlonar;《Sustainable Energy, Grids and Networks》;20161231;全文 * |
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