CN104901340A - Sample machine-based photovoltaic power adjusting method - Google Patents
Sample machine-based photovoltaic power adjusting method Download PDFInfo
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- CN104901340A CN104901340A CN201510253129.8A CN201510253129A CN104901340A CN 104901340 A CN104901340 A CN 104901340A CN 201510253129 A CN201510253129 A CN 201510253129A CN 104901340 A CN104901340 A CN 104901340A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The invention provides a sample machine-based photovoltaic power adjusting method. The method determines a sample machine via combination of manual setting and automatic selection and is used for estimating active power real-time adjustment upper limit of single inverter in a certain area, and then performing distribution of active power by means of similar margin. According to the invention, representative function of the sample machine is highlighted, selection of the sample machine is more reliable and complete, and the method is easy to apply. Meanwhile, a shortage of a failure to uploading the adjustment upper limit in real time of a current inverter is overcome; validity of distributed target instructions is greatly improved; the target instructions of the single inverter will not exceed the actual adjustment range; execution speed is increased; and control efficiency is increased.
Description
Technical field
The invention belongs to electric power system technical field of power generation, be specifically related to a kind of template processing machine method allocation strategy based on photovoltaic power control system.
Background technology
In recent years, along with development and the maturation of photovoltaic technology, photovoltaic plant was widelyd popularize, and had carried out the construction of scale.The photovoltaic plant built up needs to be connected to the grid, and carries out power control, to realize electric energy optimizing and power scheduling.Power optimization control sub-station needs dispatch command reasonable distribution, and is issued to each inverter.Leading at present several allocation strategies---average distribution system, proportional allocations method and similar nargin apportion design etc., all need the real-time fan-out capability obtaining inverter undoubtedly, namely regulate upper limit instantaneous value.But inverter on the market does not possess the ability of the real-time Drazin inverse upper limit substantially, and the mode that power optimization control sub-station also have to be arranged by definite value replaces this value.Thus, when the inverter practical adjustments upper limit does not reach set point, target instruction target word will be caused to distribute to the inverter not possessing regulating power, reduce the efficiency of control inevitably.In order to obtain the real-time adjustment upper limit of inverter, realizing better control effects, being just necessary to introduce a kind of novel distribution method---template processing machine method distribution method.
Summary of the invention
For solving the problems referred to above that prior art exists, the present invention proposes a kind of template processing machine method distribution method based on photovoltaic power control system, the method is equally applicable to other technical fields such as wind-powered electricity generation.
The present invention is concrete by the following technical solutions:
A kind of photovoltaic power control method based on template processing machine, it is characterized in that: a certain or certain several inverter exemplarily machine is set in photovoltaic plant region, make it run on and do not limit power mode, rated power output mode or maximum active power output mode, adopt the real-time active power of described template processing machine to characterize all inverter active power in this region and regulate the upper limit in real time, according to the active power regulation of active power target instruction target word realization to inverter in photovoltaic plant region that power control station issues.
Based on a photovoltaic power control method for template processing machine, it is characterized in that, said method comprising the steps of:
Step 1: determine template processing machine quantity, selected template processing machine can reflect the actual power ability of all similar inverters in a certain region; When determining template processing machine quantity: according to inverter sum in one's respective area, the ratio choosing template processing machine is no more than 10% of inverter sum; Step 2: the sample machine quantity determined according to step 1, the inverter exemplarily machine of given amount in selective light overhead utility region, selected template processing machine is set, makes it run on and do not limit power mode, rated power output mode or maximum active power output mode;
Step 3: the estimation active power regulation upper limit, all inverter active power adopting the real-time active power of described template processing machine to characterize in this region except template processing machine regulate the upper limit in real time;
Step 4: in photovoltaic plant region, active power distribution is carried out to the active power target instruction target word that power control station issues; The inverter active power determined based on step 3 regulates the upper limit in real time, and the active power target instruction target word adopting the distribution method of similar nargin to be issued at power control station carries out active power distribution in all inverters except template processing machine.
The application also preferably includes following scheme further:
In step 2, when selecting template processing machine: a) be uniformly distributed as template processing machine is chosen in condition scribing according to illumination condition and geographical position and physical features; B) according to different brands model, the different capabilities of inverter, the inverter exemplarily machine of setting ratio is chosen:
The quantity determined according to step 1 selects the inverter exemplarily machine of different illumination conditions or different brands model: when all inverters are same brand and model, and when illumination condition is basically identical, on average divide according to geographical position, then select template processing machine; When all inverters are same brand and model, but when illumination condition has a larger difference, divide according to different illumination conditions, then select template processing machine; When inverter exists brand and model difference, but when illumination condition is basically identical, divide according to inverter brand and model and distributed areas thereof, then select template processing machine; When inverter exists brand and model difference, and when illumination condition has a larger difference, first divide according to different illumination conditions, select in proportion according to inverter brand and model again in the regional then after division;
In step 2, if there is operation troubles, communication failure in selected inverter, or other reason is when causing effective template processing machine lazy weight, then the normal inverter run automatically is selected to be template processing machine successively according to pre-set order, arrange it to run on and do not limit power mode, rated power output mode or maximum active power output mode, make final effective template processing machine quantity meet definite value requirement; Wherein, described in the order that presets can be number order, the geographical position sequence of inverter, or address order.
In step 2, the quantity determined according to step 1 selects the inverter exemplarily machine of different illumination conditions or different brands model, by local operation or distant place consistency operation, changes its mode of operation for not limit power mode; Then Effective judgement is carried out to selected template processing machine, only have that normal operation, communication are intact, fault-free is without locking and be operated in and do not limit the template processing machine under power mode to be only effective template processing machine; When selected effective template processing machine quantity is less than set point, continue to select that normal operation, communication are intact by the mode automatically selected, fault-free is without the inverter exemplarily machine of locking, until meet the quantitative requirement of template processing machine, by remote control, the mode of operation of the inverter automatically selected is set to rated power output mode or maximum active power output mode simultaneously.
In step 3, when the quantity of effective template processing machine is less than 3, the mean value getting the real-time active power of all effective template processing machines regulates the upper limit in real time as all inverter active power in this region except template processing machine;
When the quantity of effective template processing machine is more than or equal to 3, remove a real-time active power maximum and a real-time active power minimum value in template processing machine, the mean value of all the other effective template processing machines real-time active power value regulates the upper limit in real time as all inverter active power in this region except template processing machine; Or calculate the deviation of each template processing machine real-time active power value and the overall active power mean value in real time of all template processing machines, remove the real-time active power value that deviation is maximum, the mean value of the real-time active power of all the other effective template processing machines regulates the upper limit in real time as all inverter active power in this region except template processing machine.
In step 4, setting photovoltaic plant region, the quantity of all grid-connected adjustable inverter namely in institute's control band except template processing machine is n, the real value of sending out of active power is for Pnow, the adjustable upper limit is Pmax, and target instruction target word is Pcmd, described target instruction target word be through conversion, for the total instruction of all grid-connected adjustable inverter disregarding template processing machine in institute's control band, the adjustment upper limit of the single inverter obtained by template processing machine is Pref, then:
Pnow＝P1now+P2now+……+PNnow；
Pmax＝Pref*n；
As Pcmd>Pnow,
Upwards regulate ratio Kup=(Pcmd – Pnow)/(Pmax – Pnow);
PNcmd＝PNnow+Kup*(Pref–PNnow)；
As Pcmd<Pnow,
Downward adjustment ratio Kdown=Pcmd/Pnow;
PNcmd＝Kdown*PNnow；
In formula, PNnow is that the reality of grid-connected adjustable inverter sends out active power, and PNcmd is the target active power of grid-connected adjustable inverter, and N is the numbering of inverter, value 1 ~ n.
The present invention has following Advantageous Effects:
Described template processing machine method distribution method, compensate for current inverter cannot in real time on send and regulate the deficiency of the upper limit, improve the validity of distributed target instruction target word dramatically, the target instruction target word of single inverter is made not exceed its practical adjustments scope, improve the speed of execution, improve the efficiency of control.
Described template processing machine method distribution method, the artificial mode arranged can directly specify preferred inverter to be template processing machine, makes it have more representativeness; The mode of automatic selection judges to select by program, can supplementing as artificial set-up mode, has flexibly, feature easily.In conjunction with artificial setting and the selection automatically of template processing machine, both highlighted the role of delegate of template processing machine, and made again the selection of template processing machine more reliably perfect, and be easy to application.
Accompanying drawing explanation
Fig. 1 is the photovoltaic power control method schematic flow sheet that the present invention is based on template processing machine;
Fig. 2 is that the template processing machine of the photovoltaic power control method that the present invention is based on template processing machine is selected and arranges sub-process schematic diagram.
Embodiment
Below just in conjunction with Figure of description---based on the photovoltaic power control method schematic flow sheet of template processing machine, further illustrate the specific embodiment of the present invention.
Template processing machine method distribution method disclosed in the present application, as shown in Figure 1, comprises the following steps:
Step 1: determine template processing machine quantity, selected template processing machine can reflect the actual power ability of all similar inverters in a certain region; When determining template processing machine quantity: according to inverter sum in one's respective area, the ratio choosing template processing machine is no more than 10% of inverter sum.Such as, a total capacity is the photovoltaic plant of 100MW, individual capacity is adopted to be the inverter of 500kW, then full station has 200 inverters, carry out Region dividing according to collecting line quantity, for convenience of description, assumed average is divided into 5 regions, then each region comprises 40 inverters, and can arrange template processing machine quantity is 4;
Step 2: the sample machine quantity determined according to step 1, the inverter exemplarily machine of given amount in selective light overhead utility region, selected template processing machine is set, makes it run on and do not limit power mode, rated power output mode or maximum active power output mode; Select, with when arranging, as shown in Figure 2, following flow process should be followed at template processing machine:
First, directly template processing machine is set: a) be uniformly distributed as template processing machine is chosen in condition scribing according to illumination condition and geographical position and physical features; B) according to different brands model, the different capabilities of inverter, the inverter exemplarily machine of setting ratio is chosen.When all inverters are same brand and model, and when illumination condition is basically identical, on average divide according to geographical position, then select template processing machine; When all inverters are same brand and model, but when illumination condition has a larger difference, divide according to different illumination conditions, then select template processing machine; When inverter exists brand and model difference, but when illumination condition is basically identical, divide according to inverter brand and model and distributed areas thereof, then select template processing machine; When inverter exists brand and model difference, and when illumination condition has a larger difference, first divide according to different illumination conditions, select in proportion according to inverter brand and model again in the regional then after division.Template processing machine after selection, by local operation or distant place consistency operation, changes its mode of operation for not limit power mode.The template processing machine quantity of artificial setting should be consistent with the template processing machine quantity arranged.In upper example, require that each region needs selection 4 inverters exemplarily machine according to this, and it is set runs on and do not limit power mode;
Secondly, Effective judgement is carried out to the template processing machine directly arranged, only have that normal operation, communication are intact, fault-free is without locking and be operated in and do not limit the template processing machine under power mode to be only effective template processing machine.While template processing machine Effective judgement, add up the quantity of the effective template processing machine in each region, be designated as number.
Then, judgement and the execution of selection is automatically carried out.When effective template processing machine quantity number equals the template processing machine quantity arranged, complete template processing machine and select; When effective template processing machine quantity number is greater than the template processing machine quantity of setting, will produce alarm event, prompting operations staff checks and processes abnormal.When effective template processing machine quantity number is less than the template processing machine quantity of setting, need automatically to select, namely according to quantity difference, select that those normal operations, communication are intact successively, fault-free is without locking, and the inverter operating in limit power mode is template processing machine, selecting sequence can be the number order of inverter, sorts in geographical position, or address order etc.For upper example, quantity difference is 4-mumber, also namely needs automatically to select 4-number platform inverter exemplarily machine.The template processing machine of automatic selection, needing to arrange its active power target instruction target word is rated power or maximum power.Complete after automatically selecting, need again to add up and upgrade the quantity number of effective template processing machine, the template processing machine automatically selected is effective template processing machine.If the effective template processing machine quantity number finally determined is not equal to the template processing machine quantity of setting, all will produce alarm event, prompting operations staff checks and processes abnormal.
Step 3: the estimation active power regulation upper limit, all inverter active power adopting the real-time active power of described template processing machine to characterize in this region except template processing machine regulate the upper limit in real time.When the quantity of effective template processing machine is not less than the quantity of setting, the estimation regulating the upper limit can be carried out.If effectively the quantity of template processing machine is less than 3, the mean value getting the real-time active power of all effective template processing machines regulates the upper limit in real time as all inverter active power in this region except template processing machine; If effectively the quantity of template processing machine is more than or equal to 3, remove a real-time active power maximum and a real-time active power minimum value in template processing machine, the mean value of all the other effective template processing machines real-time active power value regulates the upper limit in real time as all inverter active power in this region except template processing machine; Or calculate the deviation of each template processing machine real-time active power value and the overall active power mean value in real time of all template processing machines, remove the real-time active power value that deviation is maximum, the mean value of the real-time active power of all the other effective template processing machines regulates the upper limit in real time as all inverter active power in this region except template processing machine.Any method of concrete employing can by arranging selection.
In upper example, effective template processing machine quantity is 4, and the real-time active power of the effective template processing machine of 1# is designated as P1, and the real-time active power of the effective template processing machine of 2# is designated as P2, and the real-time active power of the effective template processing machine of 3# is designated as P3, and the real-time active power of the effective template processing machine of 4# is designated as P4.When the described first method of employing, when namely removing the method that then maximin be averaged, first compare the maximum in P1, P2, P3 and P4 and minimum value, be designated as Pmax and Pmin respectively, then estimation regulates the upper limit, be designated as Pref, then Pref=(P1+P2+P3+P4-Pmax-Pmin)/2, when the described second method of employing, when namely removing the method that then deviation maximum be averaged, first calculate the mean value of real-time active power, be designated as Pavg, then Pavg=(P1+P2+P3+P4)/4, then respective deviation is calculated, be designated as Pd1 respectively, Pd2, Pd3 and Pd4, then Pd1=|P1-Pavg|, Pd2=|P2-Pavg|, Pd3=|P3-Pavg|, Pd4=|P4-Pavg|, then deviation maximum is compared, determine the real-time active power of its correspondence, be designated as Pd, finally estimation regulates the upper limit, be designated as Pref, then Pref=(P1+P2+P3+P4-Pd)/3,
Step 4: in photovoltaic plant region, active power distribution is carried out to the active power target instruction target word that power control station issues; The inverter active power determined based on step 3 regulates the upper limit in real time, and the active power target instruction target word adopting the distribution method of similar nargin to be issued at power control station carries out active power distribution in all inverters except template processing machine.
The quantity of all grid-connected adjustable inverter in setting photovoltaic plant certain area (i.e. institute's control band) except template processing machine is n, the real value of sending out of active power is for Pnow, the adjustable upper limit is Pmax, target instruction target word for Pcmd (this instruction be through calculating, for the total instruction of all grid-connected adjustable inverter disregarding template processing machine in institute's control band), the adjustment upper limit of the single inverter obtained by template processing machine is Pref, then:
Pnow＝P1now+P2now+……+PNnow；
Pmax＝Pref*n；
As Pcmd>Pnow,
Upwards regulate ratio Kup=(Pcmd – Pnow)/(Pmax – Pnow);
PNcmd＝PNnow+Kup*(Pref–PNnow)；
As Pcmd<Pnow,
Downward adjustment ratio Kdown=Pcmd/Pnow;
PNcmd＝Kdown*PNnow；
In formula, PNnow is that the reality of grid-connected adjustable inverter sends out active power, and PNcmd is the target active power of grid-connected adjustable inverter, and N is the numbering of inverter, value 1 ~ n.
In sum, the active power that photovoltaic power control sub-station in the past cannot obtain single inverter regulates the upper limit in real time, the method that can only be arranged by definite value is replaced, and the active power regulation upper limit of reality is by the impact of the condition such as illumination, temperature, always be among change, target instruction target word is just caused to distribute to the inverter not possessing regulating power thus, this inverter practical adjustments upper limit is less than definite value set point, even if now by other measure, special processing is carried out to this situation, also must reduce the efficiency of control.And for a specific photovoltaic region, the characteristic of its inverter is consistent, illumination condition is also consistent substantially, if the template processing machine method distribution method described in adopting, just as the real-time adjustment upper limit obtaining every platform inverter.Distribute target instruction target word to the inverter not possessing regulating power from avoiding to a great extent, also namely target instruction target word can obtain performing fast and effectively, improves control efficiency.
Claims (7)
1. the photovoltaic power control method based on template processing machine, it is characterized in that: a certain or certain several inverter exemplarily machine is set in photovoltaic plant region, make it run on and do not limit power mode, rated power output mode or maximum active power output mode, adopt the real-time active power of described template processing machine to characterize all inverter active power in this region and regulate the upper limit in real time, according to the active power regulation of active power target instruction target word realization to inverter in photovoltaic plant region that power control station issues.
2., based on a photovoltaic power control method for template processing machine, it is characterized in that, said method comprising the steps of:
Step 1: determine template processing machine quantity, selected template processing machine can reflect the actual power ability of all similar inverters in a certain region; When determining template processing machine quantity, according to inverter sum in one's respective area, the ratio choosing template processing machine is no more than 10% of inverter sum;
Step 2: the template processing machine quantity determined according to step 1, the inverter exemplarily machine of given amount in selective light overhead utility region, selected template processing machine is set, makes it run on and do not limit power mode, rated power output mode or maximum active power output mode;
Step 3: the estimation active power regulation upper limit, all inverter active power adopting the real-time active power of described template processing machine to characterize in this region except template processing machine regulate the upper limit in real time;
Step 4: in photovoltaic plant region, active power distribution is carried out to the active power target instruction target word that power control station issues; The inverter active power determined based on step 3 regulates the upper limit in real time, and the active power target instruction target word adopting the distribution method of similar nargin to be issued at power control station carries out active power distribution in all inverters except template processing machine.
3. photovoltaic power control method according to claim 2, is characterized in that:
When selecting template processing machine in step 2, a) be uniformly distributed as template processing machine is chosen in condition scribing according to illumination condition, geographical position and physical features; B) according to different brands model, the different capabilities of inverter, the inverter exemplarily machine of setting ratio is chosen:
The quantity determined according to step 1 selects the inverter exemplarily machine of different illumination conditions or different brands model: when all inverters are same brand and model, and when illumination condition is basically identical, on average divide according to geographical position, then select template processing machine; When all inverters are same brand and model, but when illumination condition has a larger difference, divide according to different illumination conditions, then select template processing machine; When inverter exists brand and model difference, but when illumination condition is basically identical, divide according to inverter brand and model and distributed areas thereof, then select template processing machine; When inverter exists brand and model difference, and when illumination condition has a larger difference, first divide according to different illumination conditions, select in proportion according to inverter brand and model again in the regional then after division.
4. the photovoltaic power control method according to Claims 2 or 3, is characterized in that:
In step 2, if there is operation troubles, communication failure in selected inverter, or other reason is when causing effective template processing machine lazy weight, then the normal inverter run automatically is selected to be template processing machine successively according to pre-set order, arrange it to run on and do not limit power mode, rated power output mode or maximum active power output mode, make final effective template processing machine quantity meet definite value requirement; Wherein, described in the order that presets can be number order, the geographical position sequence of inverter, or address order.
5. photovoltaic power control method according to claim 2, is characterized in that:
The quantity determined according to step 1 selects the inverter exemplarily machine of different illumination conditions or different brands model, by local operation or distant place consistency operation, changes its mode of operation for not limit power mode; Then Effective judgement is carried out to selected template processing machine, only have that normal operation, communication are intact, fault-free is without locking and be operated in and do not limit the template processing machine under power mode to be only effective template processing machine; When selected effective template processing machine quantity is less than set point, continue to select that normal operation, communication are intact by the mode automatically selected, fault-free is without the inverter exemplarily machine of locking, until meet the quantitative requirement of template processing machine, by remote control, the mode of operation of the inverter automatically selected is set to rated power output mode or maximum active power output mode simultaneously.
6. photovoltaic power control method according to claim 2, is characterized in that:
In step 3, when the quantity of effective template processing machine is less than 3, the mean value getting the real-time active power of all effective template processing machines regulates the upper limit in real time as all inverter active power in this region except template processing machine;
When the quantity of effective template processing machine is more than or equal to 3, remove a real-time active power maximum and a real-time active power minimum value in template processing machine, the mean value of all the other effective template processing machines real-time active power value regulates the upper limit in real time as all inverter active power in this region except template processing machine; Or calculate the deviation of each template processing machine real-time active power value and the overall active power mean value in real time of all template processing machines, remove the real-time active power value that deviation is maximum, the mean value of the real-time active power of all the other effective template processing machines regulates the upper limit in real time as all inverter active power in this region except template processing machine.
7. photovoltaic power control method according to claim 2, is characterized in that:
In step 4, setting photovoltaic plant region, the quantity of all grid-connected adjustable inverter namely in institute's control band except template processing machine is n, the real value of sending out of active power is for Pnow, the adjustable upper limit is Pmax, and target instruction target word is Pcmd, described target instruction target word be through conversion, for the total instruction of all grid-connected adjustable inverter disregarding template processing machine in institute's control band, the adjustment upper limit of the single inverter obtained by template processing machine is Pref, then:
Pnow＝P1now+P2now+……+PNnow；
Pmax＝Pref*n；
As Pcmd>Pnow,
Upwards regulate ratio Kup=(Pcmd – Pnow)/(Pmax – Pnow);
PNcmd＝PNnow+Kup*(Pref–PNnow)；
As Pcmd<Pnow,
Downward adjustment ratio Kdown=Pcmd/Pnow;
PNcmd＝Kdown*PNnow；
In formula, PNnow is that the reality of grid-connected adjustable inverter sends out active power, and PNcmd is the target active power of grid-connected adjustable inverter, and N is the numbering of inverter, value 1 ~ n.
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| CN110854935A (en) * | 2019-12-08 | 2020-02-28 | 国网山西省电力公司电力科学研究院 | Photovoltaic power station active power automatic control method with sample plate inverter |
| CN112886922A (en) * | 2021-01-07 | 2021-06-01 | 合肥阳光智维科技有限公司 | Method and device for calculating loss electric quantity of photovoltaic power station and storage medium |
| CN114175439A (en) * | 2020-06-23 | 2022-03-11 | 华为数字能源技术有限公司 | Photovoltaic power station power coordination method and power station |
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| CN114175439A (en) * | 2020-06-23 | 2022-03-11 | 华为数字能源技术有限公司 | Photovoltaic power station power coordination method and power station |
| CN112886922A (en) * | 2021-01-07 | 2021-06-01 | 合肥阳光智维科技有限公司 | Method and device for calculating loss electric quantity of photovoltaic power station and storage medium |
| CN112886922B (en) * | 2021-01-07 | 2024-04-09 | 阳光智维科技股份有限公司 | Calculation method, device and storage medium for loss electric quantity of photovoltaic power station |
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