CN109490616A - A kind of photovoltaic DC-to-AC converter input electricity calculation method - Google Patents
A kind of photovoltaic DC-to-AC converter input electricity calculation method Download PDFInfo
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- CN109490616A CN109490616A CN201811395258.0A CN201811395258A CN109490616A CN 109490616 A CN109490616 A CN 109490616A CN 201811395258 A CN201811395258 A CN 201811395258A CN 109490616 A CN109490616 A CN 109490616A
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- photovoltaic
- active power
- header box
- converter
- inverter
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/001—Measuring real or reactive component; Measuring apparent energy
- G01R21/002—Measuring real component
Abstract
The invention discloses a kind of photovoltaic DC-to-AC converters to input electricity calculation method, comprising the following steps: S1 obtains the subordinate relation for successively including between photovoltaic plant, photovoltaic DC-to-AC converter cell, photovoltaic DC-to-AC converter, header box, header box branch and photovoltaic module；S2 obtains the active power of single header box branch；The active power of separate unit header box is calculated according to each header box branch active power for belonging to same header box in S3；The active power of single inverter is calculated according to each header box active power for connecting same photovoltaic DC-to-AC converter in S4；S5 calculates the input charge value of single inverter according to the active power of single inverter.The present invention is by carrying out logic calculation to each branch real-time running data of the photovoltaic combiner box of acquisition, show that single inverter must input active power value, and the input charge value of photovoltaic DC-to-AC converter is further calculated, solve the problems, such as that inverter input electricity can not collect monitoring system.
Description
Technical field
The present invention relates to green energy power generation technology fields, and in particular to a kind of photovoltaic DC-to-AC converter input electricity calculation method
And system.
Background technique
For solar energy as another cleaning alternative energy source, application is also more and more extensive.Photovoltaic power generation project has land occupation face
The feature of product extensively, more than number of devices.Huge number of devices and wide device area also result in photovoltaic plant Supervision
Depending on, check, the difficulty of accident treatment etc..
Photovoltaic DC-to-AC converter is a kind of generating equipment that DC inversion is converted to exchange.However current actual motion photovoltaic electric
In standing, by the measurement and control unit of photovoltaic DC-to-AC converter, the generated energy of photovoltaic DC-to-AC converter exchange side, i.e. output electricity can only be collected,
For photovoltaic DC-to-AC converter DC side electricity, i.e. input electricity, it can only often pass through the ratio of output electricity and inverter transfer efficiency
Value obtains.But usual inverter measurement and control unit can not collect inverter transfer efficiency, can only with photovoltaic DC-to-AC converter " in
The equivalent replacement of state's efficiency ".So the inverter input electricity error obtained through the above way is larger, voltameter is inputted with this
The photovoltaic DC-to-AC converter energy consumption index accuracy calculated is not high, cannot really reflect the practical operation situation of inverter.
Summary of the invention
The present invention proposes a kind of photovoltaic DC-to-AC converter input electricity calculation method for the deficiency in currently available technology, real
Now accurately calculate the input charge value of photovoltaic DC-to-AC converter.
In order to solve the above technical problems, the present invention provides a kind of photovoltaic DC-to-AC converters to input electricity calculation method, feature
It is, comprising the following steps:
S1, obtaining includes photovoltaic plant, photovoltaic DC-to-AC converter cell, photovoltaic DC-to-AC converter, header box, header box branch and photovoltaic module
Between successively include subordinate relation；
S2 obtains the active power of single header box branch；
The active power of separate unit header box is calculated according to each header box branch active power for belonging to same header box in S3；
The active power of single inverter is calculated according to each header box active power for connecting same photovoltaic DC-to-AC converter in S4；
S5 calculates the input charge value of single inverter according to the active power of single inverter.
Further, in S3, the detailed process of the active power of separate unit header box is calculated are as follows: to belonging to same confluence
Each header box branch active power of case uses algebraical sum method, and the active power of separate unit header box is calculated.
Further, in S4, the detailed process of the active power of single inverter is calculated are as follows: to the same photovoltaic of connection
Each header box active power of inverter uses algebraical sum method, and the real-time active power of single inverter is calculated.
Further, in S5, the detailed process of the input charge value of single inverter is calculated are as follows:
The input charge value of single inverter is calculated according to the following formula:
kc = kp + (pp + pc) * t * fa /2/3600
Wherein, kcElectricity current time value is inputted for single inverter；kpElectricity last moment value is inputted for single inverter；pc
For single inverter active power current time value；ppFor single inverter active power last moment value；T is single inverter
Electricity measurement period is inputted, unit is the second；Fa is unit conversion coefficient.
Further, further include S6, according to the measurement period of setting, repeat S2 to S5 step, calculated inverter is defeated
Enter charge value.
Further, measurement period is 10 seconds.
Compared with prior art, the beneficial effects obtained by the present invention are as follows being: the present invention passes through the photovoltaic combiner box to acquisition
Each branch real-time running data carries out logic calculation, show that single inverter must input active power value, and further calculate
The input charge value of photovoltaic DC-to-AC converter out solves the problems, such as that inverter input electricity can not collect monitoring system.Calculated result
Inverter energy consumption index is calculated for counting, can be improved using inverter energy consumption index and evaluate the accuracy of inverter performance.
Detailed description of the invention
Fig. 1 is the flow chart of the method for the present invention.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
A kind of photovoltaic DC-to-AC converter of the invention inputs electricity calculation method, shown in Figure 1, comprising the following steps:
S1 establishes the photovoltaic power station power generation device model of corresponding photovoltaic power station power generation device topology, the photovoltaic plant hair
Electric equipment model includes photovoltaic plant, photovoltaic DC-to-AC converter cell, photovoltaic DC-to-AC converter, header box, header box branch and photovoltaic module
Between successively include subordinate relation；
The connecting structure for electrical equipment of photovoltaic power generation equipment is topological structure, the topological structure are as follows: n(n is arranged in a photovoltaic plant
>=1) n(n >=1 is arranged in one photovoltaic DC-to-AC converter cell for a photovoltaic DC-to-AC converter cell) platform photovoltaic DC-to-AC converter, a photovoltaic inversion
Device connects n(n >=1) a photovoltaic combiner box, possess n(n >=1 in a photovoltaic combiner box) and header box branch, a header box
N(n >=1 is connected in series in branch) a photovoltaic module.Corresponding photovoltaic power station power generation device model is constructed according to this topological structure,
By photovoltaic power station power generation device model it is found that photovoltaic module, header box branch, header box, photovoltaic DC-to-AC converter and photovoltaic DC-to-AC converter
Subordinate relation between cell successively；
S2 acquires the DC current values of each header box branch, DC voltage value in photovoltaic plant；Based on collected DC current
Value, DC voltage value are active power according to P=U*I(P, and U is DC voltage, and I is DC current), single remittance is calculated
Flow the active power of case branch；
S3 has each header box branch for belonging to same header box according to the subordinate relation between header box branch and header box
Function power uses algebraical sum method, the active power of separate unit header box is calculated, and calculated result is updated to header box and is set
In standby model；
S4, according to the subordinate relation between header box and inverter, to each header box wattful power for connecting same photovoltaic DC-to-AC converter
Rate uses algebraical sum method, the real-time active power of single inverter is calculated, and calculated result is updated to inverter and is set
In standby model；
S5 calculates the input charge value of single inverter by the active power of single inverter, and calculated result is updated to inverse
Become in device device model library.
S6 repeats S2 to S5 step according to the measurement period of setting, and calculated inverter input charge value is updated
Into inverter apparatus model library.
Embodiment
The present embodiment is that a kind of photovoltaic DC-to-AC converter inputs electricity calculation method, including following procedure
It is as follows to establish data model corresponding with topological structure for step 1:
May include multiple photovoltaic plants in data model, be denoted as respectively photovoltaic plant 1, photovoltaic plant 2 ..., photovoltaic plant
n；
A photovoltaic plant includes multiple photovoltaic DC-to-AC converter cells in data model, is denoted as photovoltaic DC-to-AC converter cell 1, photovoltaic respectively
Inverter cell 2 ..., photovoltaic DC-to-AC converter cell n；For photovoltaic plant belonging to the setting of each photovoltaic DC-to-AC converter cell；
It include more photovoltaic DC-to-AC converters in one photovoltaic DC-to-AC converter cell, for example, the photovoltaic of belonging photovoltaic DC-to-AC converter cell i is inverse
Become device be denoted as respectively photovoltaic DC-to-AC converter i_1, photovoltaic DC-to-AC converter i_2 ..., photovoltaic DC-to-AC converter i_n；For every inverter, institute is set
The inverter cell of category；
One photovoltaic DC-to-AC converter connects multiple header boxs, for example, the header box of photovoltaic DC-to-AC converter j connection is denoted as header box j_ respectively
1, header box j_2 ..., header box j_n；For inverter belonging to the setting of each header box；
In one photovoltaic combiner box and a plurality of header box branch is connect, for example, the photovoltaic combiner box k and branch connect is denoted as branch respectively
K_1, branch k_2 ..., branch k_n；For header box belonging to the setting of each header box branch；
One header box branch is connected in series with muti-piece photovoltaic electrification component to be connect, for example, the photovoltaic module being connected in series with branch m point
Not are as follows: photovoltaic module m_1, photovoltaic module m_2 ..., photovoltaic module m_n；For header box belonging to every piece of photovoltaic module setting
Branch.
Step 2 judges according to collected separate unit header box communications status, if header box state is that communication is normal, acquisition
The DC current values of each header box branch, DC voltage value；It is real-time DC current values, straight if header box state is communication disruption
Stream voltage value replaces with history identical period recently, and collection value when communications status is normal, guarantees to acquire numerical value with this
Reliability improves the accuracy of evaluation.
According to P=U*I, the real-time active power of single header box branch is calculated.
According to photovoltaic plant practical situations, if header box monitoring unit can collect the real-time straight of separate unit header box
Active power value is flowed, just replaces above-mentioned calculated value using this collection value, calculates bring error to reduce, improves inverter input
The accuracy of charge value.
Step 3 uses algebraical sum method to header box branch active power, and separate unit header box is calculated has in real time
Function power.
Step 4, according to the subordinate relation between header box and inverter, to each confluence for connecting same photovoltaic DC-to-AC converter
Case active power uses algebraical sum method, the real-time active power of single inverter is calculated, and calculated result update is arrived
In inverter apparatus model.
Step 5 calculates the input charge value of single inverter using following formula by the active power of single inverter,
And calculated result is updated into inverter apparatus model library.
kc = kp + (pp + pc) * t * fa /2/3600
Wherein, kcElectricity current time value is inputted for single inverter；kpElectricity last moment value is inputted for single inverter；pc
For single inverter active power current time value；ppFor single inverter active power last moment value；T is single inverter
Electricity measurement period is inputted, unit is the second；Fa is unit conversion coefficient, kcWith kpThe unit of default is kWh, works as ppWith pc's
When unit is not kW, kW is converted by fa, it is final to realize that unit is unified.Fa default value is 1.
The principle of above-mentioned calculation formula are as follows: the knot that active power (kW) is multiplied with the time (h) is equal to according to electricity (kWh)
Fruit, formula pass through (p firstp + pc)/2 get the average value of active power in measurement period；Then it is obtained by t/3600
Time, unit hour；Again, unit conversion is completed multiplied by fa, it is above just to have obtained the inverter input charge value within the t time；
Finally, input electricity last moment value is added with input charge value in the t time, inverter input electricity current time is obtained
Value.This is arrived, one time calculating process terminates.
By calculated kcValue updates inverter in inverter apparatus model library and inputs electricity current value；
Pass through pp= pc, by pcIt is assigned to pp, and update inverter active power previous frame value in inverter apparatus model library；
In the present embodiment, measurement period default setting is 10 seconds；Work as ppWhen≤0.001(is tended to 0), first by pp= pc, reuse
ppTo calculate kc.Work as ppWhen≤0.001(is tended to 0), handled as calculating initial beginning or acquiring the wrong situation of data, with
Input active power current time value corrects last moment value.
Step 6 repeats a step 3 extremely according to measurement period defined in step 5 in each measurement period
Step 5, and calculated inverter input charge value is updated into inverter apparatus model library；
Measurement period described in step 5 and step 6 is identical concept, and numerical value is identical, and default value is 10 seconds, 5 seconds, 10 seconds,
15 seconds, half a minute it is optional.
The real-time fortune that the present invention passes through photovoltaic combiner box communications status, each branch DC current, DC voltage to acquisition
Row data carry out logic calculation, obtain separate unit header box active power value, according to header box and inverter apparatus subordinate relation, into
The input active power value of single inverter is calculated in one step, then is calculated according to formula active power, obtains separate unit inversion
The input charge value of device.This calculated result, which can be used for counting, calculates inverter energy consumption index, evaluates inverter performance, improves photovoltaic
Power station O&M efficiency.The present invention does not need additionally to increase other devices in photovoltaic plant, and cost also accordingly reduces.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvements and modifications, these improvements and modifications can also be made
Also it should be regarded as protection scope of the present invention.
Claims (6)
1. a kind of photovoltaic DC-to-AC converter inputs electricity calculation method, characterized in that the following steps are included:
S1 is obtained between photovoltaic plant, photovoltaic DC-to-AC converter cell, photovoltaic DC-to-AC converter, header box, header box branch and photovoltaic module
The subordinate relation for successively including；
S2 obtains the active power of single header box branch；
The active power of separate unit header box is calculated according to each header box branch active power for belonging to same header box in S3；
The active power of single inverter is calculated according to each header box active power for connecting same photovoltaic DC-to-AC converter in S4；
S5 calculates the input charge value of single inverter according to the active power of single inverter.
2. a kind of photovoltaic DC-to-AC converter according to claim 1 inputs electricity calculation method, characterized in that in S3, calculate
To the detailed process of the active power of separate unit header box are as follows: calculate each header box branch active power for belonging to same header box
Algebraical sum obtains the active power of separate unit header box.
3. a kind of photovoltaic DC-to-AC converter according to claim 1 inputs electricity calculation method, characterized in that in S4, calculate
To the detailed process of the active power of single inverter are as follows: calculate each header box active power for connecting same photovoltaic DC-to-AC converter
Algebraical sum method obtains the real-time active power of single inverter.
4. a kind of photovoltaic DC-to-AC converter according to claim 1 inputs electricity calculation method, characterized in that in S5, calculate single
The detailed process of the input charge value of platform inverter are as follows:
The input charge value of single inverter is calculated according to the following formula:
kc = kp + (pp + pc) * t * fa /2/3600
Wherein, kcElectricity current time value is inputted for single inverter；kpElectricity last moment value is inputted for single inverter；pc
For single inverter active power current time value；ppFor single inverter active power last moment value；T is single inverter
Electricity measurement period is inputted, unit is the second；Fa is unit conversion coefficient.
5. a kind of photovoltaic DC-to-AC converter according to claim 4 inputs electricity calculation method, characterized in that further include S6, root
According to the measurement period of setting, S2 to S5 step is repeated, calculated inverter inputs charge value.
6. a kind of photovoltaic DC-to-AC converter according to claim 5 inputs electricity calculation method, characterized in that measurement period 10
Second.
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| CN112162142A (en) * | 2020-09-30 | 2021-01-01 | 厦门科灿信息技术有限公司 | Power determination method applied to power system and related device |
| CN113466543A (en) * | 2021-04-15 | 2021-10-01 | 江苏阿诗特能源科技有限公司 | Power detection device and detection method of power generation system |
| CN114583722A (en) * | 2022-05-07 | 2022-06-03 | 深圳市德兰明海科技有限公司 | Ammeter balance control method and device, electronic equipment and system |
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