CN104158489A - Photovoltaic power station monitoring method and power station monitoring system - Google Patents
Photovoltaic power station monitoring method and power station monitoring system Download PDFInfo
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Abstract
The invention provides a photovoltaic power station monitoring method and a power station monitoring system. According to the method, through collecting in real time electric quantity data output by the AC output end of a photovoltaic inverter, electric energy date output within a preset interval and power generation incremental data at the current collection moment can be determined, so that when the collection of the electric quantity data of the photovoltaic inverter is detected to be interrupted, the daily power generating amount data of the photovoltaic inverter is corrected according to the power generation incremental data; and when the collection of the electric quantity data of the photovoltaic inverter is detected not to be interrupted, daily power generating amount data of the photovoltaic inverter obtained until the current collection moment is determined according to the power generation incremental data and the electric energy data, so that power generation monitoring information of a power station is determined according to the daily power generating amount data of each photovoltaic inverter in the power station, and the accuracy of the data is guaranteed.
Description
Technical field
The present invention relates to photovoltaic power generation technology field, particularly relate to a kind of monitoring method and a kind of power station monitoring system of photovoltaic plant.
Background technology
Devoting Major Efforts To Developing and utilize clean energy resource and regenerative resource, becomes that countries in the world ensure energy security, Optimization of Energy Structure, preserve the ecological environment, reduce greenhouse gas emission, the important measures of reply financial crisis.Along with the progressively reduction of generation of electricity by new energy construction cost, the domestic fertile soil of having built generation of electricity by new energy development, the rapid growth phase of generation of electricity by new energy is at hand.Therefore, generation of electricity by new energy business presents the situation that amount growth, multiple generating business develop simultaneously.
In the power generation process in power station, to detect the energy output of every day, be convenient to power station to manage.But, because probably can causing the energy output of statistics, the problems such as communication failure or abnormal data saltus step there is deviation, cannot obtain energy output accurately.
Summary of the invention
Embodiment of the present invention technical problem to be solved is to provide a kind of monitoring method of photovoltaic plant, to solve electric weight, detects inaccurate problem.
Accordingly, the embodiment of the present invention also provides a kind of power station monitoring system, in order to guarantee the implementation and application of said method.
In order to address the above problem, the invention discloses a kind of monitoring method of photovoltaic plant, comprising: the electric quantity data of the ac output end output of Real-time Collection photovoltaic DC-to-AC converter; According to described electric quantity data, calculate the energy data that described photovoltaic DC-to-AC converter is exported in preset interval, and described photovoltaic DC-to-AC converter is in the current generating incremental data constantly that gathers; Detect current collection and constantly whether be greater than preset interval with the last acquisition interval constantly that gathers; If described acquisition interval is greater than described preset interval, the collection of described photovoltaic DC-to-AC converter electric quantity data is interrupted, according to described generating incremental data, to till the current daily generation data of described photovoltaic DC-to-AC converter constantly that gather are revised, determine revised daily generation data; If described acquisition interval is not more than described preset interval, the collection of described photovoltaic DC-to-AC converter electric quantity data is interrupted, according to described generating incremental data and energy data, determine current gather constantly till the daily generation data of described photovoltaic DC-to-AC converter; According to the daily generation data of each photovoltaic DC-to-AC converter in power station, determine the generation monitoring information in described power station.
Optionally, the described electric quantity data of described foundation calculates energy data and the generating incremental data of output in described photovoltaic DC-to-AC converter preset interval, comprising: the useful work power and the accumulative total of generating electricity that according to described electric quantity data, calculate described photovoltaic DC-to-AC converter output; According to the energy data in photovoltaic DC-to-AC converter preset interval described in described useful work power statistic; According to described the accumulative total of generating electricity, calculate the generating incremental data in preset interval.
Optionally, the described generating incremental data of described foundation, to till the current daily generation data of described photovoltaic DC-to-AC converter constantly that gather are revised, determine revised daily generation data, comprising: detect described generating increment and whether be greater than the empirical value energy output data in acquisition interval; When described generating increment is greater than the empirical value energy output data in acquisition interval, the last daily generation data and the empirical value energy output data in acquisition interval that constantly record of gathering are sued for peace, using the daily generation data with being worth the current collection moment after revising; When described generating increment is not more than the empirical value energy output data in acquisition interval, the last daily generation data and the described generating incremental data that constantly record of gathering sued for peace, using the daily generation data with being worth the current collection moment after revising.
Optionally, according to described generating incremental data and energy data, determine current gather constantly till the daily generation data of described photovoltaic DC-to-AC converter, comprise: if described generating incremental data meets first condition, last daily generation data and the described generating increment of record constantly of gathering sued for peace, by with value record be the current daily generation data constantly that gather, wherein, described first condition be described generating incremental data be greater than 0 and described generating incremental data be less than the empirical value energy output data in described preset interval; If generating incremental data and energy data meet second condition, last daily generation data and the described energy data of record constantly of gathering sued for peace, by with value record be the current daily generation data constantly that gather, wherein, described second condition is that described generating incremental data is greater than the empirical value energy output data in described preset interval, and energy data is not equal to 0; If at least one item does not meet second condition in generating incremental data and energy data, and, described generating incremental data does not meet first condition, by the last daily generation data and the summation of the empirical value energy output data in preset interval of record constantly of gathering, by with value record be the current daily generation data that gather the moment.
Optionally, the described daily generation data according to each photovoltaic DC-to-AC converter in power station are determined the generation monitoring information in described power station, comprise: by the summation that adds up of the daily generation data of each photovoltaic DC-to-AC converter in power station, will count the gross generation data in described power station with primary system; The continuous data recording in the critical point gauge table in described gross generation data and described power station is compared, determine the energy loss in described power station; Using the gross generation data in described power station and energy loss as generation monitoring information.
The invention also discloses a kind of power station monitoring system, comprising: acquisition module, the electric quantity data of exporting for the ac output end of Real-time Collection photovoltaic DC-to-AC converter; Electric quantity data computing module, for calculating according to described electric quantity data the energy data that described photovoltaic DC-to-AC converter is exported in preset interval, and described photovoltaic DC-to-AC converter is in the current generating incremental data constantly that gathers; First detection module, gathers constantly whether be greater than preset interval with the last acquisition interval constantly that gathers for detection of current; Daily generation correcting module, if be greater than described preset interval for described acquisition interval, the collection of described photovoltaic DC-to-AC converter electric quantity data is interrupted, according to described generating incremental data, to till the current daily generation data of described photovoltaic DC-to-AC converter constantly that gather are revised, determine revised daily generation data; Daily generation determination module, if be not more than described preset interval for described acquisition interval, the collection of described photovoltaic DC-to-AC converter electric quantity data is interrupted, according to described generating incremental data and energy data, determine current gather constantly till the daily generation data of described photovoltaic DC-to-AC converter; Monitoring information determination module, determines the generation monitoring information in described power station for the daily generation data according to each photovoltaic DC-to-AC converter in power station.
Optionally, described electric quantity data computing module, comprising: the first calculating sub module, for calculate useful work power and the accumulative total of generating electricity of described photovoltaic DC-to-AC converter output according to described electric quantity data; The second calculating sub module, for the energy data according in photovoltaic DC-to-AC converter preset interval described in described useful work power statistic; The 3rd calculating sub module, for calculating the generating incremental data in preset interval according to described the accumulative total of generating electricity.
Optionally, described daily generation correcting module, comprising: whether detection sub-module, be greater than the empirical value energy output data in acquisition interval for detection of described generating increment; First revises submodule, for when described generating increment is greater than the empirical value energy output data in acquisition interval, the last daily generation data and the empirical value energy output data in acquisition interval that constantly record of gathering are sued for peace, using the daily generation data with being worth the current collection moment after revising; Second revises submodule, for when described generating increment is not more than the empirical value energy output data in acquisition interval, the last daily generation data and the described generating incremental data that constantly record of gathering sued for peace, using the daily generation data with being worth the current collection moment after revising.
Optionally, daily generation determination module, comprise: the first daily generation is determined submodule, for when described generating incremental data meets first condition, last daily generation data and the described generating increment of record constantly of gathering sued for peace, by with value record be the current daily generation data constantly that gather, wherein, described first condition be described generating incremental data be greater than 0 and described generating incremental data be less than the empirical value energy output data in described preset interval; Second day energy output is determined submodule, for when generate electricity incremental data and energy data meet second condition, last daily generation data and the described energy data of record constantly of gathering sued for peace, by with value record be the current daily generation data constantly that gather, wherein, described second condition is that described generating incremental data is greater than the empirical value energy output data in described preset interval, and energy data is not equal to 0; The 3rd daily generation is determined submodule, for not meeting second condition in generating incremental data and at least one item of energy data, and, when described generating incremental data does not meet first condition, by the last daily generation data and the summation of the empirical value energy output data in preset interval of record constantly of gathering, by with value record be the current daily generation data that gather the moment.
Optionally, described monitoring information determination module, comprising: gross generation statistics submodule, for summation that the daily generation data of each photovoltaic DC-to-AC converter in power station are added up, will count the gross generation data in described power station with primary system; Energy loss is determined submodule, for the continuous data that the critical point gauge table in described gross generation data and described power station is recorded, compares, and determines the energy loss in described power station; Monitoring information is determined submodule, for using the gross generation data in described power station and energy loss as generation monitoring information.
Compared with prior art, the embodiment of the present invention comprises following advantage:
The electric quantity data of exporting by the ac output end of Real-time Collection photovoltaic DC-to-AC converter is determined energy data and the current collection generating incremental data constantly of exporting in preset interval, thereby when the collection that described photovoltaic DC-to-AC converter electric quantity data detected occurs to interrupt, according to described generating incremental data, the daily generation data of described photovoltaic DC-to-AC converter are revised, when the collection that described photovoltaic DC-to-AC converter electric quantity data detected is interrupted, according to described generating incremental data and energy data, determine current gather constantly till the daily generation data of described photovoltaic DC-to-AC converter, and then according to the daily generation data of each photovoltaic DC-to-AC converter in power station, determine the generation monitoring information in described power station, guarantee the accuracy of data.
Accompanying drawing explanation
Fig. 1 is the flow chart of steps of the monitoring method embodiment of a kind of photovoltaic plant of the present invention;
Fig. 2 is the flow chart of steps of the optional embodiment of monitoring method of a kind of photovoltaic plant of the present invention;
Fig. 3 is the calculating schematic diagram of energy data in the optional embodiment of the present invention;
Fig. 4 is the structured flowchart of a kind of power station of the present invention monitoring system embodiment.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
One of core idea of the embodiment of the present invention is, proposes a kind of monitoring method of photovoltaic plant, to solve electric weight, detects inaccurate problem.The electric quantity data of exporting by the ac output end of Real-time Collection photovoltaic DC-to-AC converter is determined energy data and the current collection generating incremental data constantly of exporting in preset interval, thereby when the collection that described photovoltaic DC-to-AC converter electric quantity data detected occurs to interrupt, according to described generating incremental data, the daily generation data of described photovoltaic DC-to-AC converter are revised, when the collection that described photovoltaic DC-to-AC converter electric quantity data detected is interrupted, according to described generating incremental data and energy data, determine current gather constantly till the daily generation data of described photovoltaic DC-to-AC converter, and then according to the daily generation data of each photovoltaic DC-to-AC converter in power station, determine the generation monitoring information in described power station, guarantee the accuracy of data.
Embodiment mono-
With reference to Fig. 1, show the flow chart of steps of the monitoring method embodiment of a kind of photovoltaic plant of the present invention, specifically can comprise the steps:
Step 102, the electric quantity data of the ac output end output of Real-time Collection photovoltaic DC-to-AC converter.
Photovoltaic power station system can be divided into primary system and electrical secondary system, and wherein, primary system refers to the system that the hardware device relevant with current collection circuit to generating forms, and hardware device is as header box, photovoltaic DC-to-AC converter; Electrical secondary system refer to the running status of an electricity generation system monitor, the software and hardware system of control and protection, as photovoltaic plant complex automatic system.
After the solar panels generating of photovoltaic plant, produce direct current, direct current will just can be converted to alternating current by inverter, and wherein, inverter is a kind of device that direct current energy is converted to AC energy.Inverter by voltage transformer summation current transformer, can be distinguished to ac output end voltage data and the current data of Real-time Collection photovoltaic DC-to-AC converter, using voltage data and current data as electric quantity data.
Step 104, calculates according to described electric quantity data the energy data that described photovoltaic DC-to-AC converter is exported in preset interval, and described photovoltaic DC-to-AC converter is in the current generating incremental data constantly that gathers.
The present embodiment has set in advance the time interval of calculating generating related data, as preset interval is set to 10 seconds, 1 minute etc., therefore can calculate the energy data Em_cal that photovoltaic DC-to-AC converter is exported in preset interval according to energy data, can also calculate photovoltaic DC-to-AC converter at the current generating incremental data Δ Et constantly that gathers.
Wherein, energy data Em_cal refers to the electric flux that the current output terminal of the photovoltaic DC-to-AC converter by gathering is exported in certain hour section.Generating incremental data Δ Et refers to the energy output that the current output terminal of photovoltaic DC-to-AC converter is exported in certain hour section.
Step 106, detects current collection and constantly whether is greater than preset interval with the last acquisition interval constantly that gathers.
Owing to may having the faults such as communicating interrupt in data acquisition, cause data acquisition to be affected, therefore after completing the collection of current time electric quantity data, before also will determining this data acquisition, whether there is interruption, and detected current collection and constantly whether be greater than preset interval n with the last acquisition interval n constantly that gathers
0.
If so, be that acquisition interval n is greater than preset interval n
0, the collection of described photovoltaic DC-to-AC converter electric quantity data is interrupted execution step 108;
If not, acquisition interval n is not more than preset interval n
0, the collection of described photovoltaic DC-to-AC converter electric quantity data is interrupted execution step 110.
Step 108, according to described generating incremental data, to till the current daily generation data of described photovoltaic DC-to-AC converter constantly that gather are revised, determines revised daily generation data.
In the present embodiment, each collection energy output is constantly added up and just can count the daily generation Ed of inverter, therefore at each, gather the daily generation till will being recorded to this collection constantly constantly, thereby complete and after work, can determine that last gathered the daily generation Ed of (finish time) constantly the same day at this inverter.
Wherein, daily generation Ed refers to the energy output of photovoltaic DC-to-AC converter on the same day, can be used for recording photovoltaic DC-to-AC converter at the energy output of 24 hours 1 consecutive days, and the photovoltaic DC-to-AC converter of a 500KW specification of for example take is example, oepration at full load in one day 10 hours, when daily generation is no more than 5000KWH.
Wherein, if described acquisition interval is greater than described preset interval, current collection is interrupted the collection of described photovoltaic DC-to-AC converter electric quantity data constantly, if be now recorded to current daily generation till gathering constantly according to old process, the daily generation of record there will be deviation, cause the related data of electric weight inaccurate, therefore will be according to described generating incremental data Δ Et, to till the current daily generation data of described photovoltaic DC-to-AC converter constantly that gather revise, determine revised daily generation data, obtain inverter till current collection daily generation Ed accurately constantly.
Step 110, according to described generating incremental data and energy data, determine current gather constantly till the daily generation data of described photovoltaic DC-to-AC converter.
If described acquisition interval is not more than described preset interval, current collection is interrupted the collection of described photovoltaic DC-to-AC converter electric quantity data constantly, can be according to described generating incremental data Δ Et and energy data Em_cal, determine current gather constantly till the daily generation data Ed of described photovoltaic DC-to-AC converter.
Step 112, determines the generation monitoring information in described power station according to the daily generation data of each photovoltaic DC-to-AC converter in power station.
According to total generating data, determine the generation monitoring information in power station, for example determine whether photovoltaic DC-to-AC converter communicating terminal occurs, and for example in a photovoltaic plant, comprise a plurality of electric organs and corresponding photovoltaic DC-to-AC converter, power station can to every day each photovoltaic DC-to-AC converter electric weight related data add up, as the daily generation data of each photovoltaic DC-to-AC converter are added up, statistics obtains the gross generation data in power station.
In sum, the electric quantity data of exporting by the ac output end of Real-time Collection photovoltaic DC-to-AC converter is determined energy data and the current collection generating incremental data constantly of exporting in preset interval, thereby when the collection that described photovoltaic DC-to-AC converter electric quantity data detected occurs to interrupt, according to described generating incremental data, the daily generation data of described photovoltaic DC-to-AC converter are revised, when the collection that described photovoltaic DC-to-AC converter electric quantity data detected is interrupted, according to described generating incremental data and energy data, determine current gather constantly till the daily generation data of described photovoltaic DC-to-AC converter, and then according to the daily generation data of each photovoltaic DC-to-AC converter in power station, determine the generation monitoring information in described power station, guarantee the accuracy of data.
Embodiment bis-
On the basis of above-described embodiment, the present embodiment is further discussed the detection method of quantity of electricity of photovoltaic plant.
With reference to Fig. 2, show the flow chart of steps of the optional embodiment of monitoring method of a kind of photovoltaic plant of the present invention, specifically can comprise the steps:
Step 202, the electric quantity data of the ac output end output of Real-time Collection photovoltaic DC-to-AC converter.
Step 204, calculates useful work power and the accumulative total of generating electricity of described photovoltaic DC-to-AC converter output according to described electric quantity data.
Step 206, according to the energy data in photovoltaic DC-to-AC converter preset interval described in described useful work power statistic, and calculates the generating incremental data in preset interval according to described the accumulative total of generating electricity.
The electric quantity data of the ac output end of Real-time Collection photovoltaic DC-to-AC converter output in the embodiment of the present invention, by electric quantity data, calculate useful work power P, and calculate the accumulative total of generating electricity Et, and then according to the energy data Em_cal in useful work power P statistics photovoltaic DC-to-AC converter preset interval, and calculate the generating incremental data Δ Et in preset interval according to described the accumulative total of generating electricity Et
i, can adopt following formula to calculate:
As shown in Figure 3, inverter integration energy output (being the area of rectangle part in Fig. 3), i.e. energy data Em_cal=∑ P in certain period
i* Δ t
i;
Adjacent two acquisition interval that gather the moment are P
ilasting time Δ t
i=t
i-t
(i-1);
Wherein: P
ifor the instantaneous active power that a certain moment inverter is uploaded, i=0,1 ... m.
For example, suppose as ∑ Δ t
iwhile equaling 1 minute, Em_cal is that 1 minute inner product is divided energy output, and now adjacent two gather acquisition interval n=Δ t constantly
i/ 60.Then Em_cal is saved in database.
Wherein, useful work power P refers in alternating current circuit, and the mean value of the integration of the instantaneous useful work power of the load consumption sending in one-period, also claims average power.
Change amount in the preset interval of photovoltaic DC-to-AC converter the accumulative total of generating electricity, calculates the generating incremental data in preset interval, and concrete formula is as follows: Δ Et
i=Et
i-Et
(i-1).
As above routine, preset interval is 1 minute, at interval of 1 minute, uploads current time the accumulative total of generating electricity value, by calculating, faces mutually the data difference that two acquisition times are adjacent two data frame, calculates inverter accumulative total per minute electric weight change amount.
Wherein, system can record photovoltaic DC-to-AC converter record from the beginning that puts into operation until current energy output constantly, i.e. the accumulative total of generating electricity Et of gathering by telemetry station.
Step 208, detects current collection and constantly whether is greater than preset interval with the last acquisition interval constantly that gathers.
Detect current collection t constantly
iwith last collection moment t
(i-1)acquisition interval whether be greater than preset interval, as above in example, suppose that preset interval is 1 minute, is normalized n=Δ t by acquisition interval according to preset interval
i/ 60, detect n and whether be greater than 1.
If so, be that acquisition interval is greater than preset interval, execution step 210; If not, acquisition interval is not more than preset interval, execution step 216.
Step 210, detects described generating increment and whether is greater than the empirical value energy output data in acquisition interval.
Preset empirical value energy output data Cem in the present embodiment, the 500KW inverter of take is example, energy output per minute is no more than 8KWH conventionally.In the present embodiment, using empirical value energy output as a constant, set Cem=8KWH.
Be greater than after preset interval acquisition interval being detected, further detect generating increment Delta Et
iwhether be greater than the empirical value energy output data n * Cem in acquisition interval.
If so, generate electricity increment Delta Et
ibe greater than the empirical value energy output data n * Cem in acquisition interval, execution step 212; If not, the increment Delta Et that generates electricity
ibe not more than the empirical value energy output data n * Cem in acquisition interval, execution step 214.
Step 212, sues for peace the last daily generation data and the empirical value energy output data in acquisition interval that constantly record of gathering, using the daily generation data with being worth the current collection moment after revising.
As described generating increment Delta Et
ibe greater than the empirical value energy output data n * Cem in acquisition interval, i.e. Δ Et
iduring > n*Cem, by the last daily generation data Ed of record constantly that gathers
(i-1)sue for peace with the empirical value energy output data n * Cem in acquisition interval, using the daily generation data Ed with being worth the current collection moment after revising
i, that is:
If Δ Et
i> n*Cem, Ed
i=Ed
(i-1)+ n*Cem.
Step 214, sues for peace the last daily generation data and the described generating incremental data that constantly record of gathering, using the daily generation data with being worth the current collection moment after revising.
As described generating increment Delta Et
ibe not more than the empirical value energy output data n * Cem in acquisition interval, during Δ Eti≤n*Cem, by the last daily generation data Ed of record constantly that gathers
(i-1)with described generating increment Delta Et
isue for peace, using the daily generation data Ed with being worth the current collection moment after revising
i, that is:
If Δ Eti≤n*Cem, Ed
i=Ed
(i-1)+ Δ Et
i.
Step 216, detects described generating incremental data and whether meets first condition.
Due to generating incremental data Δ Et
iempirical value energy output data n * Cem in acquisition interval, and the relation between energy data Em_cal directly has influence on the accuracy of image data, therefore want preset different testing conditions to detect, according to different conditions, determine different daily generation data Ed
icomputational methods.
Wherein, described first condition is described generating incremental data Δ Et
ibe greater than 0 and described generating incremental data Δ Et
ibe less than the empirical value energy output data Cem in described preset interval, described first condition is 0 < Δ Et
i< Cem.Be not more than after preset interval acquisition interval being detected, detect described generating incremental data Δ Et
iwhether meet first condition.
If so, detect described generating incremental data Δ Et
imeet first condition, perform step 218; If not, detect described generating incremental data Δ Et
ido not meet first condition, perform step 220.
Step 218, by the last daily generation data and the summation of described generating increment of record constantly of gathering, by with value record be the current daily generation data that gather the moment.
If described generating incremental data Δ Et
imeet first condition, by the last daily generation data Ed of record constantly that gathers
(i-1)with described generating incremental data Δ Et
isummation, will be currently to gather daily generation data constantly with value record, if i.e.: 0 < Δ Et
i< Cem, Ed
i=Ed
(i-1)+ Δ Et
i.
Step 220, detects generating incremental data and energy data and whether meets second condition.
If detect described generating incremental data Δ Et
ido not meet first condition, continue to detect generating incremental data Δ Et
iwhether meet second condition with energy data Em_cal, wherein, described second condition is described generating incremental data Δ Et
ibe greater than the empirical value energy output data Cem in described preset interval, and energy data Em_cal is not equal to 0, described second condition is Δ Et
i> Cem and Em_cal ≠ 0.
If so, generate electricity incremental data Δ Et
iem_cal meets second condition with energy data, performs step 222; If not, the incremental data Δ Et that generates electricity
iand/or energy data Em_cal do not meet second condition, perform step 224.
Step 222, by the last daily generation data and the summation of described energy data of record constantly of gathering, by with value record be the current daily generation data that gather the moment.
If generating incremental data Δ Et
iem_cal meets second condition with energy data, i.e. Δ Et
i> Cem and Em_cal ≠ 0, by the last daily generation data Ed of record constantly that gathers
(i-1)with described energy data Em_cal summation, by with value record be the current daily generation data constantly that gather, that is:
If Δ Et
i> Cem and Em_cal ≠ 0, Ed
i=Ed
(i-1)+ Em_cal.
Step 224, by the last daily generation data and the summation of the empirical value energy output data in preset interval of record constantly of gathering, by with value record be the current daily generation data that gather the moment.
If in generating incremental data and energy data, at least one does not meet second condition, and described generating incremental data does not meet first condition, for example, Δ Et
i=Cem, or Δ Et
i≤ 0, or in the situation such as Em_cal=0, by the last daily generation data Ed of record constantly that gathers
(i-1)with the empirical value energy output data Cem summation in preset interval, by with value record be current daily generation data constantly, the i.e. Ed of gathering
i=Ed
(i-1)+ Cem.
Step 226, by the summation that adds up of the daily generation data of each photovoltaic DC-to-AC converter in power station, will count the gross generation data in described power station with primary system.
Step 228, compares the continuous data recording in the critical point gauge table in described gross generation data and described power station, determines the energy loss in described power station.
Step 230, using the gross generation data in described power station and energy loss as generation monitoring information.
Photovoltaic DC-to-AC converter daily generation Ed has reflected the actual power situation of the affiliated photovoltaic array of inverter, is to calculate the most basic source of photovoltaic plant gross generation, is a key index weighing photovoltaic plant operation management level.Therefore, in the present embodiment, also according to the daily generation data of each photovoltaic DC-to-AC converter in power station, determine the generation monitoring information in described power station.
Wherein, by the daily generation data Ed of each photovoltaic DC-to-AC converter in the power station summation that adds up, obtain the gross generation data E in described power station, i.e. E=∑ Ed.
Further obtain the continuous data recording in the critical point gauge table in described power station, the continuous data recording in the critical point gauge table in just described gross generation data and described power station compares, and can determine the energy loss in described power station etc.
In the present embodiment, principle according to electric weight=active power * time, adopt the energy output in real-time integration read group total photovoltaic DC-to-AC converter preset interval, and the generating incremental data of uploading in conjunction with photovoltaic DC-to-AC converter (if preset interval is 1 minute), (as data acquisition, upload and do not interrupt) under certain condition and can reduce as far as possible energy output data in photovoltaic DC-to-AC converter preset interval, and then guarantee being in all the time in rational scope of inverter electric quantity data on the same day.
Below, adopt specific embodiment to discuss the monitoring method of photovoltaic plant, suppose that the active power in each collection moment that photovoltaic DC-to-AC converter is uploaded is as shown in table 1:
| Sequence number | t | P(KW) | Δ t (second) | Remarks |
| 1 | 20140201090959 | 320 | ? | YYYYMMDDhhmmss |
| 2 | 20140201091009 | 400 | 10 | YYYYMMDDhhmmss |
| 3 | 20140201091019 | 200 | 10 | / |
| 4 | 20140201091029 | 350 | 10 | / |
| 5 | 20140201091039 | 400 | 10 | / |
| 6 | 20140201091049 | 380 | 10 | / |
| 7 | 20140201091059 | 420 | 10 | / |
| 8 | 20140201091109 | 300 | 10 | ? |
| 9 | 20140201091119 | 490 | 10 | ? |
| 10 | 20140201091129 | 480 | 10 | ? |
| 11 | 20140201091139 | 430 | 10 | ? |
| 12 | 20140201091149 | 450 | 10 | ? |
| 13 | 20140201091159 | 460 | 10 | ? |
| 14 | 20140201091649 | 430 | 300 | Communicating interrupt 5 minutes |
Table 1
It is as shown in table 2 below that photovoltaic DC-to-AC converter is uploaded each daily generation data that gather the moment:
| Sequence number | t | Et(KWH) | Δ t (dividing) | Remarks |
| 1 | 20140201090959 | 500 | 1 | YYYYMMDDhhmmss |
| 2 | 20140201091059 | 506 | 1 | / |
| 3 | 20140201091159 | 5150 | 1 | Abnormal saltus step |
| 4 | 20140201091659 | 5185 | 1 | Communicating interrupt |
Table 2
Suppose photovoltaic DC-to-AC converter when daily generation Ed checkout result last time be 200KWH, preset interval be 1 (minute).
Calculating (normal data calculating) when daily generation data in (1) 9: 11
First, calculate 9: 11 active power integration electric weight (being energy data).
Wherein, photovoltaic DC-to-AC converter is when daily generation data constantly to calculate 9: 11, and expression by not comprising 9: 11, was gone up photovoltaic DC-to-AC converter generating increment in 9: 09: 59 to 9 o'clock 10 minutes 59 seconds 1 minute weeks of one minute photovoltaic DC-to-AC converter energy output by the end of 9: 11.
Em_cal＝∑P
i×Δt
i
Em_cal＝320×10+400×10+200×10+350×10+400×10+380×10
=20500 kilowatts of seconds
If be converted into kilowatt-hour, computational methods are 20500/3600, and energy output per minute approximates 5.69 kilowatt hours (getting 2 significant digits).
Step 2: calculate inverter when daily generation change amount per minute (incremental data of generating electricity)
ΔEt
i＝Et
i-Et
(i-1)
ΔEt
i＝506-500
＝6KWH
Step 3: logic judgement, determine the current electric weight Ed on the same day constantly that gathers
i
Due to acquisition interval n≤1 (being preset interval), and 0 < Δ Et
i< Cem, the incremental data of generating electricity Δ Et
imeet first condition.So daily generation data Ed of photovoltaic DC-to-AC converter
iequal the last daily generation data Ed of record constantly that gathers
(i-1)with generating incremental data Δ Et
isum, that is:
Ed
i＝Ed
(i-1)+ΔEt
i＝200+6＝206KWH。
(2) 9 o'clock 12 minute same day, electric weight calculated (solving the abnormal saltus step problem of the accumulative total of generating electricity)
Step 1: calculate 9: 12 active power integration electric weight (being energy data)
Em_cal＝∑P
i×Δt
i
Em_cal＝420×10+300×10+490×10+480×10+430×10+450×10
=25700 kilowatts of seconds
Being converted into a kilowatt-hour calculating method is 25700/3600, and energy output per minute approximates 7.14 kilowatt hours (getting 2 significant digits).
Step 2: calculate inverter when daily generation change amount per minute (incremental data of generating electricity)
ΔEt
i＝Et
i-Et
(i-1)
ΔEt
i＝5150-506
＝4644KWH
Step 3: logic judgement, determine system current time electric weight on same day Ed
Due to acquisition interval n≤1, and Δ Et
i> Cem and Em_cal ≠ 0, the incremental data of generating electricity Δ Eti and energy data Em_cal meet second condition, so photovoltaic DC-to-AC converter electric weight on same day Ed
iequal the last daily generation data Ed of record constantly that gathers
(i-1)with described energy data Em_cal, that is:
Ed
i＝Ed
(i-1)+Em_cal＝206+7.14＝213.13KWH。
(3) 9 o'clock 12 minute same day, electric weight calculated (solving communicating interrupt problem)
Step 1: calculate 9: 12 active power integration electric weight (being energy data) with acquisition interval n
Em_cal＝∑P
i×Δt
i
Em_cal＝460×300
=138000 kilowatts of seconds
Being converted into a kilowatt-hour calculating method is 138000/3600, and energy output per minute approximates 38.3 kilowatt hours (getting 2 significant digits).
n＝Δti/60＝300/60＝5
Step 2: calculate inverter when daily generation change amount per minute (incremental data of generating electricity)
ΔEt
i＝Et
i-Et
(i-1)
ΔEt
i＝5185-5150
＝35KWH
Step 3: logic judgement, determine system current time electric weight on same day Ed
i
Due to n > 1, and Δ Et
i< 40, i.e. (5*Cem) equals the last daily generation data Ed of record constantly that gathers so inverter is worked as daily generation data Edi
(i-1)with described generating increment Delta Et
isum, i.e. Ed
i=Ed
(i-1)+ Δ Et
i=213.13+35=248.13KWH.
To sum up, by the correction to when daily generation data, can effectively avoid the abnormal saltus step impact of inverter accumulative total charge value of measuring because inverter system is abnormal or people causes for misoperation, and then work as daily generation data for operations staff provides relatively accurate inverter.
It should be noted that, for embodiment of the method, for simple description, therefore it is all expressed as to a series of combination of actions, but those skilled in the art should know, the embodiment of the present invention is not subject to the restriction of described sequence of movement, because according to the embodiment of the present invention, some step can adopt other orders or carry out simultaneously.Secondly, those skilled in the art also should know, the embodiment described in specification all belongs to preferred embodiment, and related action might not be that the embodiment of the present invention is necessary.
Embodiment tri-
On the basis of above-described embodiment, the present embodiment also provides a kind of power station monitoring system.
With reference to Fig. 4, show the structured flowchart of a kind of power station of the present invention monitoring system embodiment, specifically can comprise as lower module:
Acquisition module 402, the electric quantity data of exporting for the ac output end of Real-time Collection photovoltaic DC-to-AC converter.
Electric quantity data computing module 404, for calculating according to described electric quantity data the energy data that described photovoltaic DC-to-AC converter is exported in preset interval, and described photovoltaic DC-to-AC converter is in the current generating incremental data constantly that gathers.
First detection module 406, gathers constantly whether be greater than preset interval with the last acquisition interval constantly that gathers for detection of current.
Daily generation correcting module 408, if be greater than described preset interval for described acquisition interval, the collection of described photovoltaic DC-to-AC converter electric quantity data is interrupted, according to described generating incremental data, to till the current daily generation data of described photovoltaic DC-to-AC converter constantly that gather are revised, determine revised daily generation data.
Daily generation determination module 410, if be not more than described preset interval for described acquisition interval, the collection of described photovoltaic DC-to-AC converter electric quantity data is interrupted, according to described generating incremental data and energy data, determine current gather constantly till the daily generation data of described photovoltaic DC-to-AC converter.
Monitoring information determination module 412, determines the generation monitoring information in described power station for the daily generation data according to each photovoltaic DC-to-AC converter in power station.
In sum, the electric quantity data of exporting by the ac output end of Real-time Collection photovoltaic DC-to-AC converter is determined energy data and the current collection generating incremental data constantly of exporting in preset interval, thereby when the collection that described photovoltaic DC-to-AC converter electric quantity data detected occurs to interrupt, according to described generating incremental data, the daily generation data of described photovoltaic DC-to-AC converter are revised, when the collection that described photovoltaic DC-to-AC converter electric quantity data detected is interrupted, according to described generating incremental data and energy data, determine current gather constantly till the daily generation data of described photovoltaic DC-to-AC converter, and then according to the daily generation data of each photovoltaic DC-to-AC converter in power station, determine the generation monitoring information in described power station, guarantee the accuracy of data.
Optionally, described electric quantity data computing module, comprising: the first calculating sub module, for calculate the useful work power of described photovoltaic DC-to-AC converter output and current the accumulative total of generating electricity according to described electric quantity data; The second calculating sub module, for the energy data according in photovoltaic DC-to-AC converter preset interval described in described useful work power statistic; The 3rd calculating sub module, for calculating the generating incremental data in preset interval according to described the accumulative total of generating electricity;
Optionally, described daily generation correcting module, comprising: whether detection sub-module, be greater than the empirical value energy output data in acquisition interval for detection of described generating increment; First revises submodule, for when described generating increment is greater than the empirical value energy output data in acquisition interval, the last daily generation data and the empirical value energy output data in acquisition interval that constantly record of gathering are sued for peace, using the daily generation data with being worth the current collection moment after revising; Second revises submodule, for when described generating increment is not more than the empirical value energy output data in acquisition interval, the last daily generation data and the described generating incremental data that constantly record of gathering sued for peace, using the daily generation data with being worth the current collection moment after revising.
Optionally, daily generation determination module, comprise: the first daily generation is determined submodule, for when described generating incremental data meets first condition, last daily generation data and the described generating increment of record constantly of gathering sued for peace, by with value record be the current daily generation data constantly that gather, wherein, described first condition be described generating incremental data be greater than 0 and described generating incremental data be less than the empirical value energy output data in described preset interval; Second day energy output is determined submodule, for when generate electricity incremental data and energy data meet second condition, last daily generation data and the described energy data of record constantly of gathering sued for peace, by with value record be the current daily generation data constantly that gather, wherein, described second condition is that described generating incremental data is greater than the empirical value energy output data in described preset interval, and energy data is not equal to 0; The 3rd daily generation is determined submodule, for not meeting second condition in generating incremental data and at least one item of energy data, and, when described generating incremental data does not meet first condition, by the last daily generation data and the summation of the empirical value energy output data in preset interval of record constantly of gathering, by with value record be the current daily generation data that gather the moment.
Optionally, described monitoring information determination module, comprising: gross generation statistics submodule, for summation that the daily generation data of each photovoltaic DC-to-AC converter in power station are added up, will count the gross generation data in described power station with primary system; Energy loss is determined submodule, for the continuous data that the critical point gauge table in described gross generation data and described power station is recorded, compares, and determines the energy loss in described power station; Monitoring information is determined submodule, for using the gross generation data in described power station and energy loss as generation monitoring information.
To sum up, by the correction to when daily generation data, can effectively avoid the abnormal saltus step impact of inverter accumulative total charge value of measuring because inverter system is abnormal or people causes for misoperation, and then work as daily generation data for operations staff provides relatively accurate inverter.
For device embodiment, because it is substantially similar to embodiment of the method, so description is fairly simple, relevant part is referring to the part explanation of embodiment of the method.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, and each embodiment stresses is the difference with other embodiment, between each embodiment identical similar part mutually referring to.
Those skilled in the art should understand, the embodiment of the embodiment of the present invention can be provided as method, device or computer program.Therefore, the embodiment of the present invention can adopt complete hardware implementation example, implement software example or in conjunction with the form of the embodiment of software and hardware aspect completely.And the embodiment of the present invention can adopt the form that wherein includes the upper computer program of implementing of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) of computer usable program code one or more.
The embodiment of the present invention is with reference to describing according to flow chart and/or the block diagram of the method for the embodiment of the present invention, terminal equipment (system) and computer program.Should understand can be in computer program instructions realization flow figure and/or block diagram each flow process and/or the flow process in square frame and flow chart and/or block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing terminal equipment to produce a machine, the instruction of carrying out by the processor of computer or other programmable data processing terminal equipment is produced for realizing the device in the function of flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.
These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing terminal equipment with ad hoc fashion work, the instruction that makes to be stored in this computer-readable memory produces the manufacture that comprises command device, and this command device is realized the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
These computer program instructions also can be loaded on computer or other programmable data processing terminal equipment, make to carry out sequence of operations step to produce computer implemented processing on computer or other programmable terminal equipment, thereby the instruction of carrying out is provided for realizing the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame on computer or other programmable terminal equipment.
Although described the preferred embodiment of the embodiment of the present invention, once those skilled in the art obtain the basic creative concept of cicada, can make other change and modification to these embodiment.So claims are intended to all changes and the modification that are interpreted as comprising preferred embodiment and fall into embodiment of the present invention scope.
Finally, also it should be noted that, in this article, relational terms such as the first and second grades is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply and between these entities or operation, have the relation of any this reality or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby the process, method, article or the terminal equipment that make to comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or be also included as the intrinsic key element of this process, method, article or terminal equipment.The in the situation that of more restrictions not, the key element being limited by statement " comprising ... ", and be not precluded within process, method, article or the terminal equipment that comprises described key element and also have other identical element.
Above to the monitoring method of a kind of photovoltaic plant provided by the present invention and a kind of power station monitoring system, be described in detail, applied specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof; , for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention meanwhile.
Claims (10)
1. a monitoring method for photovoltaic plant, is characterized in that, comprising:
The electric quantity data of the ac output end output of Real-time Collection photovoltaic DC-to-AC converter;
According to described electric quantity data, calculate the energy data that described photovoltaic DC-to-AC converter is exported in preset interval, and described photovoltaic DC-to-AC converter is in the current generating incremental data constantly that gathers;
Detect current collection and constantly whether be greater than preset interval with the last acquisition interval constantly that gathers;
If described acquisition interval is greater than described preset interval, the collection of described photovoltaic DC-to-AC converter electric quantity data is interrupted, according to described generating incremental data, to till the current daily generation data of described photovoltaic DC-to-AC converter constantly that gather are revised, determine revised daily generation data;
If described acquisition interval is not more than described preset interval, the collection of described photovoltaic DC-to-AC converter electric quantity data is interrupted, according to described generating incremental data and energy data, determine current gather constantly till the daily generation data of described photovoltaic DC-to-AC converter;
According to the daily generation data of each photovoltaic DC-to-AC converter in power station, determine the generation monitoring information in described power station.
2. method according to claim 1, is characterized in that, the described electric quantity data of described foundation calculates energy data and the generating incremental data of output in described photovoltaic DC-to-AC converter preset interval, comprising:
According to described electric quantity data, calculate useful work power and the accumulative total of generating electricity of described photovoltaic DC-to-AC converter output;
According to the energy data in photovoltaic DC-to-AC converter preset interval described in described useful work power statistic;
According to described the accumulative total of generating electricity, calculate the generating incremental data in preset interval.
3. method according to claim 1, is characterized in that, the described generating incremental data of described foundation, to till the current daily generation data of described photovoltaic DC-to-AC converter constantly that gather are revised, is determined revised daily generation data, comprising:
Detect described generating increment and whether be greater than the empirical value energy output data in acquisition interval;
When described generating increment is greater than the empirical value energy output data in acquisition interval, the last daily generation data and the empirical value energy output data in acquisition interval that constantly record of gathering are sued for peace, using the daily generation data with being worth the current collection moment after revising;
When described generating increment is not more than the empirical value energy output data in acquisition interval, the last daily generation data and the described generating incremental data that constantly record of gathering sued for peace, using the daily generation data with being worth the current collection moment after revising.
4. method according to claim 1, is characterized in that, according to described generating incremental data and energy data, determine current gather constantly till the daily generation data of described photovoltaic DC-to-AC converter, comprising:
If described generating incremental data meets first condition, last daily generation data and the described generating increment of record constantly of gathering sued for peace, by with value record be the current daily generation data constantly that gather, wherein, described first condition be described generating incremental data be greater than 0 and described generating incremental data be less than the empirical value energy output data in described preset interval;
If generating incremental data and energy data meet second condition, last daily generation data and the described energy data of record constantly of gathering sued for peace, by with value record be the current daily generation data constantly that gather, wherein, described second condition is that described generating incremental data is greater than the empirical value energy output data in described preset interval, and energy data is not equal to 0;
If at least one item does not meet second condition in generating incremental data and energy data, and, described generating incremental data does not meet first condition, by the last daily generation data and the summation of the empirical value energy output data in preset interval of record constantly of gathering, by with value record be the current daily generation data that gather the moment.
5. method according to claim 1, is characterized in that, the described daily generation data according to each photovoltaic DC-to-AC converter in power station are determined the generation monitoring information in described power station, comprising:
By the summation that adds up of the daily generation data of each photovoltaic DC-to-AC converter in power station, will count the gross generation data in described power station with primary system;
The continuous data recording in the critical point gauge table in described gross generation data and described power station is compared, determine the energy loss in described power station;
Using the gross generation data in described power station and energy loss as generation monitoring information.
6. a power station monitoring system, is characterized in that, comprising:
Acquisition module, the electric quantity data of exporting for the ac output end of Real-time Collection photovoltaic DC-to-AC converter;
Electric quantity data computing module, for calculating according to described electric quantity data the energy data that described photovoltaic DC-to-AC converter is exported in preset interval, and described photovoltaic DC-to-AC converter is in the current generating incremental data constantly that gathers;
First detection module, gathers constantly whether be greater than preset interval with the last acquisition interval constantly that gathers for detection of current;
Daily generation correcting module, if be greater than described preset interval for described acquisition interval, the collection of described photovoltaic DC-to-AC converter electric quantity data is interrupted, according to described generating incremental data, to till the current daily generation data of described photovoltaic DC-to-AC converter constantly that gather are revised, determine revised daily generation data;
Daily generation determination module, if be not more than described preset interval for described acquisition interval, the collection of described photovoltaic DC-to-AC converter electric quantity data is interrupted, according to described generating incremental data and energy data, determine current gather constantly till the daily generation data of described photovoltaic DC-to-AC converter;
Monitoring information determination module, determines the generation monitoring information in described power station for the daily generation data according to each photovoltaic DC-to-AC converter in power station.
7. system according to claim 6, is characterized in that, described electric quantity data computing module, comprising:
The first calculating sub module, for calculating useful work power and the accumulative total of generating electricity of described photovoltaic DC-to-AC converter output according to described electric quantity data;
The second calculating sub module, for the energy data according in photovoltaic DC-to-AC converter preset interval described in described useful work power statistic;
The 3rd calculating sub module, for calculating the generating incremental data in preset interval according to described the accumulative total of generating electricity.
8. system according to claim 6, is characterized in that, described daily generation correcting module, comprising:
Whether detection sub-module, be greater than the empirical value energy output data in acquisition interval for detection of described generating increment;
First revises submodule, for when described generating increment is greater than the empirical value energy output data in acquisition interval, the last daily generation data and the empirical value energy output data in acquisition interval that constantly record of gathering are sued for peace, using the daily generation data with being worth the current collection moment after revising;
Second revises submodule, for when described generating increment is not more than the empirical value energy output data in acquisition interval, the last daily generation data and the described generating incremental data that constantly record of gathering sued for peace, using the daily generation data with being worth the current collection moment after revising.
9. system according to claim 6, is characterized in that, daily generation determination module, comprising:
The first daily generation is determined submodule, for when described generating incremental data meets first condition, last daily generation data and the described generating increment of record constantly of gathering sued for peace, by with value record be the current daily generation data constantly that gather, wherein, described first condition be described generating incremental data be greater than 0 and described generating incremental data be less than the empirical value energy output data in described preset interval;
Second day energy output is determined submodule, for when generate electricity incremental data and energy data meet second condition, last daily generation data and the described energy data of record constantly of gathering sued for peace, by with value record be the current daily generation data constantly that gather, wherein, described second condition is that described generating incremental data is greater than the empirical value energy output data in described preset interval, and energy data is not equal to 0;
The 3rd daily generation is determined submodule, for not meeting second condition in generating incremental data and at least one item of energy data, and, when described generating incremental data does not meet first condition, by the last daily generation data and the summation of the empirical value energy output data in preset interval of record constantly of gathering, by with value record be the current daily generation data that gather the moment.
10. system according to claim 6, is characterized in that, described monitoring information determination module, comprising:
Gross generation statistics submodule, for summation that the daily generation data of each photovoltaic DC-to-AC converter in power station are added up, will count the gross generation data in described power station with primary system;
Energy loss is determined submodule, for the continuous data that the critical point gauge table in described gross generation data and described power station is recorded, compares, and determines the energy loss in described power station;
Monitoring information is determined submodule, for using the gross generation data in described power station and energy loss as generation monitoring information.
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