CN109901003A - A kind of inverter power fault detection method and system - Google Patents
A kind of inverter power fault detection method and system Download PDFInfo
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Abstract
The present invention provides a kind of inverter power fault detection method and systems, comprising: the input power and output power of acquisition DC bus-bar voltage, inverter；Determine the power split where the input power of inverter；DC bus-bar voltage is normalized, and is normalized according to input power of the power split where the input power of inverter to inverter；According to the power split where the input power and the input power of DC bus-bar voltage and inverter after normalized, power loss value is obtained；Power failure is determined according to the output power of inverter and power loss value.Technical solution provided by the invention improves the accuracy of breakdown judge.
Description
Technical field
The invention belongs to photovoltaic power generation field of fault detection, and in particular to a kind of inverter power fault detection method and be
System.
Background technique
In photovoltaic generating system, the ratio that inverter price accounts for only has 5%-8% or so, but generating efficiency certainly
The failure of qualitative factor, inverter will have a direct impact on output power, and detecting inverter state in time is to promote the pass of generated energy
Key.Studies have shown that in the case where busbar voltage is stablized, the loss and semiconductor switch parameter, switching frequency of photovoltaic DC-to-AC converter
And pass through current related.Under Vehicles Collected from Market modularization, cost effective trend, mainstream inverter topology, control algolithm, half
Conductor switch parameter is close, therefore output power and electric current are closely related.
Meanwhile as the application of group-serial inverter increases, traditional centralized inverter monitoring system is to output power
It compares to judge that the mode of failure is failed to judge and judged by accident in the presence of certain, is blocked in such as large stretch of component by clouds layer shadow
When, it is likely that photovoltaic DC-to-AC converter large area escape working condition or false alarm are caused, biggish power network fluctuation is generated.
According to producer's power-efficient curve, the power that can not be accurately directed between power split, such as 35%, 63% is equal negative
Power under load rate carries out output power analysis, therefore when emergent power failure, can not accurately determine and.
Summary of the invention
It compares to solve traditional centralized inverter monitoring system to output power to judge the side of failure
Formula there are problems that failing to judge and judge by accident, a kind of inverter power fault detection method provided by the invention, comprising:
Acquire the input power and output power of DC bus-bar voltage, inverter；
Determine the power split where the input power of inverter；
DC bus-bar voltage is normalized, and according to the power split where the input power of inverter to inverse
The input power for becoming device is normalized；
According to where the input power of DC bus-bar voltage and inverter after normalized and the input power
Power split obtain power loss value；
Power failure is determined according to the output power of inverter and power loss value.
Before determining the power split where the input power of inverter further include: whether detection DC bus-bar voltage is pre-
If inverter working range in, if retaining this DC bus-bar voltage information if, otherwise delete this DC bus-bar voltage
Information, and alarm to terminate detection after unknown failure.
Power split where the output power of the determining inverter, comprising:
The rated power of the input power of inverter and inverter is compared, where the input power for determining inverter
Power split.
DC bus-bar voltage is normalized as the following formula:
In formula, VinFor DC bus-bar voltage, VnFor the load voltage value of inverter,For the DC bus electricity after normalization
Pressure.
The input power of inverter is normalized as the following formula:
In formula,For normalized power, PinFor the input power of inverter, Pn× k% is inverter input power institute
In the corresponding performance number of power split, wherein PnFor the power-handling capability of inverter, k% is the value of power split, PinThe 1st to
When n-1 power split, k% takes the maximum value of corresponding power split, PinIn n-th of power split, k% takes 100%, the n to be
Power split sum.
According to where the input power of DC bus-bar voltage and inverter after normalized and the input power
Power split, power loss value is calculated as follows:
In formula, Ploss_iFor power loss value, ai0、ai1It is the DC bus-bar voltage after normalizationMatch value；bi0、
bi1It is normalized powerMatch value；ci0、ci1It is normalized power squareMatch value；I is power split number.
According to the output power of inverter and power loss value power failure, comprising:
The input power of inverter subtracts power loss value and obtains theoretical output power value；
Calculate the absolute value of the difference of the output power of theoretical output power value and inverter；
Judge whether the absolute value is greater than preset threshold value, if more than threshold value, then is judged to that power failure occurs；If small
In being equal to threshold value, then it is determined as inactivity failure.
A kind of inverter power fault detection system provided by the invention, comprising:
Acquisition module, for acquiring the input power and output power of DC bus-bar voltage, inverter；
Division module, for determining the power split where the input power of inverter；
Module is normalized, for DC bus-bar voltage to be normalized, and according to the input power of inverter institute
Power split the input power of inverter is normalized；
Loss calculation module, according to the input power of DC bus-bar voltage and inverter after normalized and described
Power split where input power obtains power loss value；
Breakdown judge module, for determining power failure according to the output power of power loss value and inverter.
The inverter power fault detection system further includes preliminary examination module, for whether detecting DC bus-bar voltage pre-
If inverter working range in, if retaining this DC bus-bar voltage information if, otherwise delete this DC bus-bar voltage
Information, and alarm to terminate detection after unknown failure.
The division module includes:
First comparison submodule, for comparing the rated power of the input power of inverter and inverter；
It determines submodule, for the comparing result according to comparison unit, determines the power where the input power of inverter
Subregion.
The breakdown judge module includes:
First computational submodule obtains theoretical output power for subtracting power loss value by the input power of inverter
Value；
Second computational submodule, for calculating the absolute value of the difference of theoretical output power value Yu inverter output power；
Failure determines submodule, judges whether the absolute value is greater than preset threshold value, if more than threshold value, then is judged to sending out
Raw power failure；If being less than or equal to threshold value, it is determined as inactivity failure.
Compared with the latest prior art, technical solution provided by the invention has the advantages that
Technical solution provided by the invention is carried out power split judgement to power, is returned based on power split to data
One change processing carries out failure according to power loss value according to the data and power split number calculating power loss value after normalization
Judgement, so that breakdown judge is more accurate, calculating is quicker, improves the accuracy of breakdown judge, solves and fail to judge and miss
The problem of sentencing；
Technical solution provided by the invention carries out subregion judgement to power, and each subregion can be realized accurately quasi-
Resultant carries out power loss calculating according to fitting amount and is suitable for advising greatly to more accurately judge whether power failure occurs
The on-line monitoring in mould string type photovoltaic DC-to-AC converter parallel connection power station.
Detailed description of the invention
Fig. 1 is a kind of inverter power fault detection method flow chart of the present invention；
Fig. 2 is a kind of inverter power fault detection method flow chart of the embodiment of the present invention；
Fig. 3 is a kind of inverter power fault detection method flow chart of the embodiment of the present invention.
Specific embodiment
The present invention will be further described in detail with reference to the accompanying drawing:
Embodiment one,
Fig. 1 is a kind of inverter power fault detection method flow chart of the present invention, as shown in Figure 1, provided by the invention one
Kind inverter power fault detection method, comprising:
Acquire the input power and output power of DC bus-bar voltage, inverter；
Determine the power split where the input power of inverter；
DC bus-bar voltage is normalized, and according to the power split where the input power of inverter to inverse
The input power for becoming device is normalized；
According to where the input power of DC bus-bar voltage and inverter after normalized and the input power
Power split obtain power loss value；
Power failure is determined according to the output power of inverter and power loss value.
Before determining the power split where the input power of inverter further include: whether detection DC bus-bar voltage is pre-
If inverter working range in, if retaining this DC bus-bar voltage information if, otherwise delete this DC bus-bar voltage
Information, and alarm to terminate detection after unknown failure.
Power split where the output power of the determining inverter, comprising:
The rated power of the input power of inverter and inverter is compared, where the input power for determining inverter
Power split.
DC bus-bar voltage is normalized as the following formula:
In formula, VinFor DC bus-bar voltage, VnFor the load voltage value of inverter,For the DC bus electricity after normalization
Pressure.
The input power of inverter is normalized as the following formula:
In formula,For normalized power, PinFor the input power of inverter, Pn× k% is inverter input power institute
In the corresponding performance number of power split, wherein PnFor the power-handling capability of inverter, k% is the value of power split, PinThe 1st to
When n-1 power split, k% takes the maximum value of corresponding power split, PinIn n-th of power split, k% takes 100%, the n to be
Power split sum.
According to where the input power of DC bus-bar voltage and inverter after normalized and the input power
Power split, power loss value is calculated as follows:
In formula, Ploss_iFor power loss value, ai0、ai1It is the DC bus-bar voltage after normalizationMatch value；bi0、
bi1It is normalized powerMatch value；ci0、ci1It is normalized power squareMatch value；I is power split number.
According to the output power of inverter and power loss value power failure, comprising:
The input power of inverter subtracts power loss value and obtains theoretical output power value；
Calculate the absolute value of the difference of the output power of theoretical output power value and inverter；
Judge whether the absolute value is greater than preset threshold value, if more than threshold value, then is judged to that power failure occurs；If small
In being equal to threshold value, then it is determined as inactivity failure.
Embodiment two,
Based on identical inventive concept, the present invention provides a kind of inverter power fault detection systems, may include:
Acquisition module, for acquiring the input power and output power of DC bus-bar voltage, inverter；
Division module, for determining the power split where the input power of inverter；
Module is normalized, for DC bus-bar voltage to be normalized, and according to the input power of inverter institute
Power split the input power of inverter is normalized；
Loss calculation module, according to the input power of DC bus-bar voltage and inverter after normalized and described
Power split where input power obtains power loss value；
Breakdown judge module, for determining power failure according to the output power of power loss value and inverter.
The inverter power fault detection system can also include preliminary examination module, for whether detecting DC bus-bar voltage
In preset inverter working range, if retaining this DC bus-bar voltage information if, this DC bus is otherwise deleted
Information of voltage, and alarm to terminate detection after unknown failure.
The division module may include:
First comparison submodule, for comparing the rated power of the input power of inverter and inverter；
It determines submodule, for the comparing result according to comparison unit, determines the power where the input power of inverter
Subregion.
The breakdown judge module may include:
First computational submodule obtains theoretical output power for subtracting power loss value by the input power of inverter
Value；
Second computational submodule, for calculating the absolute value of the difference of theoretical output power value Yu inverter output power；
Failure determines submodule, judges whether the absolute value is greater than preset threshold value, if more than threshold value, then is judged to sending out
Raw power failure；If being less than or equal to threshold value, it is determined as inactivity failure.
The normalization module can as the following formula be normalized the DC bus-bar voltage of reservation:
In formula, VinFor DC bus-bar voltage, VnFor the load voltage value of inverter,For the DC bus electricity after normalization
Piezoelectricity pressure.
The normalization module can as the following formula be normalized the input power of inverter:
In formula,For normalized power, PinFor the input power of inverter, Pn× k% is inverter input power institute
In the corresponding performance number of power split, wherein PnFor the power-handling capability of inverter, k% is the value of power split, PinThe 1st to
When n-1 power split, k% takes the maximum value of corresponding power split, PinIn n-th of power split, k% takes 100%, the n to be
Power split sum.
The loss calculation module may be calculated as power loss value:
In formula, Ploss_iFor power loss value, ai0、ai1It is the DC bus-bar voltage after normalizationMatch value；bi0、
bi1It is normalized powerMatch value；ci0、ci1It is normalized power squareMatch value；I is power split number.
Embodiment three,
Fig. 2 be a kind of inverter power fault detection system schematic diagram, as shown in Fig. 2, the system by preliminary examination module, return
One changes module, loss calculation module, power contrast's module and breakdown judge module composition；
The inverter power fault detection system is located at master system, the DC bus acquired in real time by host computer
Voltage, the input power of inverter and output power carry out power failure judgement.
DC bus-bar voltage, input power are transferred to preliminary examination module and normalization module, and output power is transferred to power pair
Than module, normalization module, loss calculation module, power contrast's module, breakdown judge gradually as a result are transmitted to from preliminary examination module
Module, final fault judgment module export conclusion, indicate whether that power breaks down.
Fig. 3 is a kind of inverter power fault detection method flow chart, as shown in figure 3, working as DC bus in preliminary examination module
Voltage retains data in inverter working range, when DC bus-bar voltage removes the data outside inverter working range, and
It alarms " unknown failure ".The rated power of input power and inverter comparison, for example, can be according to the load in efficiency weighting table
Rate is divided into 0%-5%, 5%-10%, 10%-20%, 20%-30%, 30%-50%, 50%-75%, 75%-100%,
100% or more this 8 subregions.Whether preliminary examination module is other failures and output power location i by exporting.
It normalizes in module, DC bus-bar voltage VinDivided by load voltage value VnDC bus-bar voltage after being normalizedWherein load voltage value Vn3 or more DC voltage data when being provided by producer, or being operated normally by acquisition inverter
Average value.Input power PinDivided by place power section respective value Pn× k% obtains normalized power ratioWherein power-handling capability
PnIt is provided by producer, k presses maximum value in 1-7 subregion, and the 8th subregion is calculated by 100%.
DC bus-bar voltage after partition number, normalization where input powerNormalized powerIt is transferred to loss calculation
Module, loss calculation module is according to formula computed losses.Formula is as follows:
Wherein,
ai0、ai1For DC bus-bar voltage after normalizationMatch value；
bi0、bi1For power after normalizationMatch value；
ci0、ci1For power square after normalizationMatch value；I is power split number.
Power contrast's module judges to detect power output PoutWith calculating power output Pin-Ploss_iDifference, i.e., | Pout-
Pin-Ploss_i| whether it is greater than threshold value, and exports conclusion and give breakdown judge module.Threshold value initial value is set as | Pin-Ploss_i|×
5%, it can artificial setting change.
Breakdown judge module, when power contrast's module output conclusion be, | Pout-Pin-Ploss_i| when being less than or equal to threshold value,
It is determined as inactivity failure；|Pout-Pin-Ploss_i| it is greater than threshold value, is judged to that power failure occurs.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Finally it should be noted that: the above examples are only used to illustrate the technical scheme of the present invention rather than to its protection scope
Limitation, although the application is described in detail referring to above-described embodiment, those of ordinary skill in the art should
Understand: those skilled in the art read the specific embodiment of application can still be carried out after the application various changes, modification or
Person's equivalent replacement, but these changes, modification or equivalent replacement, are applying within pending claims.
Claims (11)
1. a kind of inverter power fault detection method characterized by comprising
Acquire the input power and output power of DC bus-bar voltage, inverter；
Determine the power split where the input power of inverter；
DC bus-bar voltage is normalized, and according to the power split where the input power of inverter to inverter
Input power be normalized；
Function where the input power and the input power of DC bus-bar voltage and inverter after normalized
Rate subregion obtains power loss value；
Power failure is determined according to the output power of inverter and power loss value.
2. inverter power fault detection method as described in claim 1, which is characterized in that determine the input power of inverter
Before the power split at place further include: whether detection DC bus-bar voltage is in preset inverter working range, if if
Retain this DC bus-bar voltage information, otherwise delete this DC bus-bar voltage information, and alarms to terminate after unknown failure
Detection.
3. inverter power fault detection method as described in claim 1, which is characterized in that the output of the determining inverter
Power split where power, comprising:
The rated power of the input power of inverter and inverter is compared, determines the function where the input power of inverter
Rate subregion.
4. inverter power fault detection method as described in claim 1, which is characterized in that as the following formula to DC bus-bar voltage
It is normalized:
In formula, VinFor DC bus-bar voltage, VnFor the load voltage value of inverter,For the DC bus-bar voltage after normalization.
5. inverter power fault detection method as described in claim 1, which is characterized in that as the following formula to the input of inverter
Power is normalized:
In formula,For normalized power, PinFor the input power of inverter, Pn× k% is function where inverter input power
The corresponding performance number of rate subregion, wherein PnFor the power-handling capability of inverter, k% is the value of power split, PinThe the 1st to n-1
When a power split, k% takes the maximum value of corresponding power split, PinIn n-th of power split, it is power that k%, which takes 100%, n,
Subregion sum.
6. inverter power fault detection method as described in claim 1, which is characterized in that according to straight after normalized
Power damage is calculated as follows in the input power for flowing busbar voltage and inverter and the power split where the input power
Consumption value:
In formula, Ploss_iFor power loss value, ai0、ai1It is the DC bus-bar voltage after normalizationMatch value；bi0、bi1?
For normalized powerMatch value；ci0、ci1It is normalized power squareMatch value；I is power split number.
7. inverter power fault detection method as described in claim 1, which is characterized in that according to the output power of inverter
With power loss value power failure, comprising:
The input power of inverter subtracts power loss value and obtains theoretical output power value；
Calculate the absolute value of the difference of the output power of theoretical output power value and inverter；
Judge whether the absolute value is greater than preset threshold value, if more than threshold value, then is judged to that power failure occurs；If be less than etc.
In threshold value, then it is determined as inactivity failure.
8. a kind of inverter power fault detection system characterized by comprising
Acquisition module, for acquiring the input power and output power of DC bus-bar voltage, inverter；
Division module, for determining the power split where the input power of inverter；
Module is normalized, for DC bus-bar voltage to be normalized, and according to where the input power of inverter
The input power of inverter is normalized in power split；
Loss calculation module, according to the input power and the input of DC bus-bar voltage and inverter after normalized
Power split where power obtains power loss value；
Breakdown judge module, for determining power failure according to the output power of power loss value and inverter.
9. inverter power fault detection system as claimed in claim 8, which is characterized in that the inverter power failure inspection
Examining system further includes preliminary examination module, for detecting DC bus-bar voltage whether in preset inverter working range, if if
Retain this DC bus-bar voltage information, otherwise delete this DC bus-bar voltage information, and alarms to terminate after unknown failure
Detection.
10. inverter power fault detection system as claimed in claim 8, which is characterized in that the division module includes:
First comparison submodule, for comparing the rated power of the input power of inverter and inverter；
It determines submodule, for the comparing result according to comparison unit, determines the power split where the input power of inverter.
11. inverter power fault detection system as claimed in claim 8, which is characterized in that the breakdown judge module packet
It includes:
First computational submodule obtains theoretical output power value for subtracting power loss value by the input power of inverter；
Second computational submodule, for calculating the absolute value of the difference of theoretical output power value Yu inverter output power；
Failure determines submodule, judges whether the absolute value is greater than preset threshold value, if more than threshold value, then is judged to that function occurs
Rate failure；If being less than or equal to threshold value, it is determined as inactivity failure.
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| CN110635704A (en) * | 2019-08-22 | 2019-12-31 | 江苏固德威电源科技股份有限公司 | Inverter bus voltage control method |
| CN111313830A (en) * | 2020-02-12 | 2020-06-19 | 合肥阳光新能源科技有限公司 | Inverter diagnosis method and system |
| CN112782495A (en) * | 2019-11-06 | 2021-05-11 | 成都鼎桥通信技术有限公司 | String abnormity identification method for photovoltaic power station |
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| 董玮: "并网光伏逆变器闪变特性测量与分析", 《电测与仪表》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110635704A (en) * | 2019-08-22 | 2019-12-31 | 江苏固德威电源科技股份有限公司 | Inverter bus voltage control method |
| CN110635704B (en) * | 2019-08-22 | 2021-08-24 | 江苏固德威电源科技股份有限公司 | Inverter bus voltage control method |
| CN112782495A (en) * | 2019-11-06 | 2021-05-11 | 成都鼎桥通信技术有限公司 | String abnormity identification method for photovoltaic power station |
| CN111313830A (en) * | 2020-02-12 | 2020-06-19 | 合肥阳光新能源科技有限公司 | Inverter diagnosis method and system |
| CN111313830B (en) * | 2020-02-12 | 2022-05-24 | 阳光新能源开发股份有限公司 | Inverter diagnosis method and system |
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