CN114421522B - Photovoltaic power station power control method and system - Google Patents
Photovoltaic power station power control method and system Download PDFInfo
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- CN114421522B CN114421522B CN202111668216.1A CN202111668216A CN114421522B CN 114421522 B CN114421522 B CN 114421522B CN 202111668216 A CN202111668216 A CN 202111668216A CN 114421522 B CN114421522 B CN 114421522B
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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
- H02J3/381—Dispersed generators
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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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- 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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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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
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention provides a photovoltaic power station power control method and a system, which comprise the following steps: step 1, obtaining basic data of a photovoltaic power station to be tested; step 2, setting operation parameters of the photovoltaic power station to be tested; step 3, calculating the active power change value of the photovoltaic power station to be tested and the total input quantity of the inverters of the photovoltaic power station to be tested; step 4, controlling the power of the photovoltaic power station according to the real-time power of the photovoltaic power station to be tested and the power target set value of the photovoltaic power station to be tested by combining the active power change value of the photovoltaic power station to be tested and the total input quantity of the inverters, which are obtained in the step 3; the invention can realize the power lifting and lifting speed limiting of the photovoltaic power station on the photovoltaic power station control system, and control the operation cost of the power station.
Description
Technical Field
The invention belongs to the technical field of new energy photovoltaic power generation, and particularly relates to a photovoltaic power station power control method and system.
Background
At present, the power control of the photovoltaic power station is generally realized by an AGC/AVC system; the AGC automatic power generation control (Automatic Generation Control) is to utilize a computer system, a communication network and adjustable equipment to calculate a control strategy on line according to the real-time operation working condition of a power grid, and automatically control the active output of the power generation equipment in a closed loop mode. AVC automatic voltage control (Automatic Voltage Control) refers to the use of a computer system, a communication network and adjustable equipment to calculate control strategies on line according to real-time operating conditions of a power grid, and automatically control reactive and voltage regulation equipment in a closed loop manner so as to achieve reasonable reactive voltage distribution.
According to the technical regulation of the photovoltaic power station access power system, the change rate of the active power of the photovoltaic power station is not more than 10% of installed capacity/min, and the condition that the change rate of the active power of the photovoltaic power station exceeds a limit value caused by the reduction of solar irradiance is allowed.
But for the photovoltaic power station AGC/AVC system to fail, or the photovoltaic power station which is in a debugging period and has smaller scale and is not configured with the AGC/AVC system, once the condition that the power grid needs to be subjected to power adjustment occurs. The photovoltaic power station can not effectively control the generated power and the power change rate due to the lack of corresponding power control means. The power grid is required to be shut down and cut off by the whole station, or the power lifting speed exceeds the limit and is economically checked, and huge economic loss is caused for the photovoltaic power station.
Disclosure of Invention
The invention aims to provide a photovoltaic power station power control method and system, which can realize the power lifting and lifting speed limiting of a photovoltaic power station on a photovoltaic power station control system and solve the defects in the prior art.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention provides a photovoltaic power station power control method, which comprises the following steps:
step 1, obtaining basic data of a photovoltaic power station to be tested;
and 4, controlling the power of the photovoltaic power station according to the real-time power of the photovoltaic power station to be tested and the power target set value of the photovoltaic power station to be tested by combining the active power change value of the photovoltaic power station to be tested and the total input quantity of the inverters, which are obtained in the step 3.
Preferably, in step 1, the obtaining basic data of the photovoltaic power plant to be tested includes the number of power generation units, the number of inverters, the maximum design power of the photovoltaic power plant to be tested, the maximum design power of each power generation unit, the maximum design power of each inverter, and the maximum change rate of the active power of the photovoltaic power plant to be tested for 1 minute.
Preferably, in step 2, the operation parameters of the photovoltaic power plant to be tested are set to include an active power change rate set value of the photovoltaic power plant to be tested, a power deviation minimum value of the photovoltaic power plant to be tested, and a power target set value of the photovoltaic power plant to be tested.
Preferably, in step 3, the total input number of the inverter of the photovoltaic power plant to be tested is calculated by the following formula, and the specific method is as follows:
wherein ,NIall The total input quantity of the inverters of the photovoltaic power station to be tested is calculated; YD (YD) i An operation signal for the i-th power generation unit;
N I the power generation input quantity of the inverter corresponding to each power generation unit; n (N) GUMAX The number of the power generation units of the photovoltaic power station to be tested is the number of the power generation units of the photovoltaic power station to be tested; n (N) IMAX And the number of inverters of the photovoltaic power station to be tested.
Preferably, in step 3, the active power variation value of the photovoltaic power plant to be tested is calculated by the following formula:
K O ＝K max ×K s
wherein ,KO The active power change value of the photovoltaic power station to be tested is; k (K) max The maximum value of the change rate of the active power of the photovoltaic power station to be tested for 1 minute; k (K) s And setting a value for the change rate of the active power of the photovoltaic power station to be tested.
Preferably, in step 4, the power of the photovoltaic power station to be tested is calculated according to the real-time power of the photovoltaic power station to be tested and the power target set value of the photovoltaic power station to be tested by combining the active power variation value of the photovoltaic power station to be tested and the total input quantity of the inverters obtained in step 3, and the power of the photovoltaic power station to be tested is controlled, and the specific method is as follows:
s41, comparing the difference value between the real-time power of the photovoltaic power station to be tested and the power target set value of the photovoltaic power station to be tested with a threshold value, and judging whether the photovoltaic power station to be tested performs power up operation or power down operation according to the comparison result;
and S42, controlling the photovoltaic power station to be tested to perform power up operation or power down operation according to the active power change value of the photovoltaic power station to be tested and the total input quantity of the inverters, which are obtained in the step 3.
Preferably, the difference value between the real-time power of the photovoltaic power station to be tested and the power target set value of the photovoltaic power station to be tested is compared with a threshold value, and the photovoltaic power station to be tested is judged to perform power up operation or power down operation according to the comparison result, and the specific method is as follows:
if the difference value between the real-time power of the photovoltaic power station to be tested and the power target set value of the photovoltaic power station to be tested is greater than or equal to a threshold value, the photovoltaic power station to be tested performs power-up operation;
and if the difference value between the real-time power of the photovoltaic power station to be tested and the power target set value of the photovoltaic power station to be tested is smaller than the threshold value, the photovoltaic power station to be tested performs power reduction operation.
Preferably, the active power variation value of the photovoltaic power station to be tested and the total input quantity of the inverter obtained in the step 3 are used for controlling the photovoltaic power station to be tested to perform power-up operation, and the specific method is as follows:
S421A, calculating the current downlink power of the photovoltaic power station to be tested according to the following formula:
P AN ＝P AO +K O
wherein ,PAN The current power of the photovoltaic power station to be tested is given out; k (K) O The active power change value of the photovoltaic power station to be tested is; p (P) AO Real-time power of the photovoltaic power station to be tested;
S422A, calculating a power set value corresponding to each power generation unit according to the obtained current power output of the photovoltaic power station to be tested;
S423A, calculating the real-time power of the photovoltaic power station to be tested at the current moment according to the obtained power set value corresponding to each power generation unit;
S424A, comparing the difference value between the real-time power of the photovoltaic power station to be tested at the current moment and the real-time power of the photovoltaic power station to be tested at the previous moment with the power deviation minimum value of the photovoltaic power station to be tested, wherein if the difference value between the real-time power of the photovoltaic power station to be tested at the current moment and the real-time power of the photovoltaic power station to be tested at the previous moment is more than or equal to the power deviation minimum value of the photovoltaic power station to be tested, returning to S421A; otherwise, the photovoltaic power station to be tested finishes the power-up operation.
Preferably, the active power variation value of the photovoltaic power station to be tested and the total input quantity of the inverter obtained in the step 3 are used for controlling the photovoltaic power station to be tested to perform or run with reduced power, and the specific method is as follows:
S421B, calculating the current downlink power of the photovoltaic power station to be tested according to the following formula:
P AN ＝P AO -Ko
wherein ,PAN The current power of the photovoltaic power station to be tested is given out; k (K) O The active power change value of the photovoltaic power station to be tested is; p (P) AO Real-time power of the photovoltaic power station to be tested;
S422B, calculating a power set value corresponding to each power generation unit according to the obtained current power output of the photovoltaic power station to be tested;
S423B, calculating the real-time power of the photovoltaic power station to be tested at the current moment according to the obtained power set value corresponding to each power generation unit;
S424B, comparing the difference between the real-time power of the photovoltaic power station to be tested at the current moment and the real-time power of the photovoltaic power station to be tested at the previous moment with the power deviation minimum value of the photovoltaic power station to be tested, wherein if the difference between the real-time power of the photovoltaic power station to be tested at the current moment and the real-time power of the photovoltaic power station to be tested at the previous moment is more than or equal to the power deviation minimum value of the photovoltaic power station to be tested, returning to S421B; otherwise, the photovoltaic power station to be tested finishes the power-up operation.
A photovoltaic plant power control system capable of operating the method comprising:
the data acquisition unit is used for acquiring basic data of the photovoltaic power station to be tested;
the parameter setting unit is used for setting the operation parameters of the photovoltaic power station to be tested;
the parameter calculation unit is used for calculating the active power change value of the photovoltaic power station to be tested and the total input quantity of the inverters of the photovoltaic power station to be tested;
and the power control unit is used for controlling the power of the photovoltaic power station according to the real-time power of the photovoltaic power station and the power target set value of the photovoltaic power station and combining the obtained active power change value of the photovoltaic power station to be tested and the total input quantity of the inverters.
Compared with the prior art, the invention has the beneficial effects that:
according to the photovoltaic power station power control method provided by the invention, the power of the photovoltaic power station is controlled according to the real-time power of the photovoltaic power station and the power target set value of the photovoltaic power station by combining the obtained active power change value of the photovoltaic power station to be tested and the total input quantity of the inverters, so that the active power of the photovoltaic power station is controlled to rise and fall and the rise and fall rate is limited, the active power change rate of the photovoltaic power station is not more than 10% of installed capacity/min, and the photovoltaic power station power control method can be realized on a photovoltaic power station control system;
the invention can realize the power lifting and lifting speed limiting of the photovoltaic power station on the photovoltaic power station control system, and avoid the occurrence of the conditions.
Drawings
Fig. 1 is a schematic flow chart of the present invention.
Detailed Description
The following describes embodiments of the present invention by way of specific examples:
for example, a photovoltaic power station has a maximum power of 10000KW (10 MW) and is composed of 5 power generation units with the same capacity, and each power generation unit is composed of 10 inverters with the same capacity. At a certain moment of operation, 5 power generation units with the same capacity and 10 inverters with the same capacity respectively corresponding to the 5 power generation units with the same capacity are all put into use, and the real-time power is 6000KW.
Specifically: the invention provides a photovoltaic power station power control method, which comprises the following steps:
number of power generation units N of photovoltaic power station GUMAX ＝5；
Photovoltaic power plant power generation unit inverter number N IMAX ＝10；
Maximum design power P of photovoltaic power station Amax ＝10000KW(10MW)；
Maximum design power P of power generation unit of photovoltaic power station GUMAX ＝10000÷5＝2000KW；
Photovoltaic power plant inverter maximum design power P IMAX ＝P GUMAX ÷10＝200KW；
Maximum value K of 1 minute change rate of active power of power station max ，K max ＝P Amax ×0.1＝10000×0.1＝1000KW；
Step 1, manually inputting setting data
A) Active power change rate set value K of power station s The data is manually input by photovoltaic power station operators in a photovoltaic power station monitoring system, and the range of the set value is 0 < K s < 1; the present example is set to 0.5;
b) Minimum value deltaP of power deviation of photovoltaic power station min Is a fixed value, ΔPmin is an artificial set value, and the numerical range is 0 less than or equal to ΔP min ≦K max . The specific parameters are set according to the actual capacity of the photovoltaic power station and the condition of the equipment adjustment speed. The present example is set to 300KW.
C) Photovoltaic power plant power target set point P AS Assigning a value, wherein the set value range is 0 less than or equal to P AS ≦P Amax 。
The data are manually input by operators of the photovoltaic power station in a monitoring system of the photovoltaic power station, and the data can be divided into two operation states of power-up C1 of the photovoltaic power station and power-down C2 of the photovoltaic power station, wherein C1: the power of the photovoltaic power station is increased, the example is set to be full-capacity grid connection, P AS =10000 KW; c2: the photovoltaic power plant is powered down, this example is set to full capacity cut-off grid, P AS ＝0KW。
K O ＝K max ×K s
wherein ,Kmax The maximum value of the change rate of the active power of the photovoltaic power station to be tested for 1 minute; k (K) s And setting a value for the change rate of the active power of the photovoltaic power station to be tested.
As in the present example, the power plant active power rate of change set point K s Set to 0.5, then K O ＝1000×0.5＝500KW；
e) Each power generation unit operation signal YD i Wherein 0 +.i +.N GUMAX The photovoltaic power station control system judges whether the power generation unit is put into operation according to the operation data of the power generation unit, if so, YD i =1, when not running YD i ＝0。
F) Input quantity of power generation units of photovoltaic power station
In this way, when all 5 power generation units with the same capacity of the photovoltaic power plant are put into operation, YD 1 To YD 5 Are all 1, N GU ＝5。/>
G) Inverter operation signal YN corresponding to each power generation unit ij ，0≦i≦N GUMAX ；0≦j≦N Imax . Photovoltaic power station controlThe control system judges whether the inverter is put into operation according to the inverter operation data, and YN is obtained if the inverter is operated ij =1, run unoperated YN ij ＝0。
H) Inverter input number N of inverter power generation corresponding to each power generation unit of photovoltaic power station I ，0≦I≦N Imax ，
If 10 inverters corresponding to the 5 photovoltaic power generation units are all put into operation at the moment, N is the same as the number of the inverters 1 To N 5 10.
I) Total input quantity of photovoltaic power station inverter
When the photovoltaic power station is operated by all 5 power generation units with the same capacity, all 10 inverters of the photovoltaic power station are operated at the moment, the photovoltaic power station is operated by
N Iall ＝1×10+1×10+1×10+1×10+1×10＝50。
calculating the difference between the real-time power of the photovoltaic power station to be tested and the power target set value of the photovoltaic power station to be tested, comparing the difference with a threshold value, and judging whether the photovoltaic power station to be tested performs power-up operation or power-down operation according to the comparison result, wherein:
if P AS -P AO The photovoltaic power station to be tested performs power-up operation and enters step 6; wherein P is AO For the real-time power of the photovoltaic power station to be tested, the numerical range is 0 less than or equal to P AO ≦P Amax ；P AS The power target set value of the photovoltaic power station to be tested is set, and the set value range is 0 less than or equal to P AS ≦P Amax ；P Amax The maximum design power for the photovoltaic power station.
If P AS -P AO If the power is less than 0, the photovoltaic power station to be tested performs power reduction operation, and the step is carried out;
as in the present example:
real-time power P of photovoltaic power station at moment AO =6000 KW, if, P AS -P AO When 10000-6000=4000 +.0, the power C1 is increased;
if P AS -P AO =0-6000= -4000 < 0, the photovoltaic power plant reduces the power C2.
s61, enabling the current downlink power of the photovoltaic power station to be tested to be: p (P) AN ＝P AO +K O ；
The example is as follows: p (P) AN ＝6000+500＝6500KW；
Recording the current T1 moment, wherein the real-time power of the photovoltaic power station to be tested is P' AO Let P' AO ＝P AO As in this example: p'. AO ＝6000KW。
S62, calculating the power setting of each power generation unit according to the following formula, and transmitting the power setting to each power generation unit:
P AN-I ＝P AN /N Iall *N I ，
wherein ,PAN-I Setting power values for each inverter; i is the number of each power generation unit; n (N) Iall The total input quantity of the inverters of the photovoltaic power station is calculated; n (N) I The input quantity of the power generation inverters corresponding to each power generation unit of the photovoltaic power station is calculated.
Each power generation unit of the photovoltaic power station is provided with a data acquisition device, the power set value of the power generation unit is issued to each inverter by the data acquisition device, and the process is realized by the data acquisition device.
As in the present example: calculated N Iall ＝50；N 1 To N 5 10 in each case.
P AN-1 ＝6500/50*10＝1300
P AN-2 ＝6500/50*10＝1300
……
P AN-5 ＝6500/50*10＝1300；
Starting timing for 1 minute, and after 1 minute arrives, executing S63;
s63, obtaining the minimum value delta P of the power deviation of the photovoltaic power station in the step 1 min 300KW; the current power P of the photovoltaic power plant to be tested at the moment T1 AN The generated power of the photovoltaic power station is 6500KW, the generated power of the photovoltaic power station changes according to the real-time irradiation intensity, and if the irradiation intensity meets the requirement of 6500KW generated energy, the real-time power P of the photovoltaic power station to be detected at the current T2 moment AO ≈P AN =6500, where if |p AO -P′ AO |＝|6500-6000|＝500＞ΔP min 300, returning to the step 5;
s81, enabling the current downlink power of the photovoltaic power station to be tested to be: p (P) AN ＝P AO -Ko；
The example is as follows: p (P) AN ＝6000-500＝5500KW；
Recording the current T1 moment, wherein the real-time power of the photovoltaic power station to be tested is P' AO Let P' AO ＝P AO As in this example: p'. AO ＝5500KW。
S82, calculating the power setting of each power generation unit according to the following formula, and transmitting the power setting to each power generation unit:
P AN-I ＝P AN /N Iall *N I ，
wherein ,PAN-I Setting power values for each inverter; i is the number of each power generation unit；N Iall The total input quantity of the inverters of the photovoltaic power station is calculated; n (N) I The input quantity of the power generation inverters corresponding to each power generation unit of the photovoltaic power station is calculated.
Each power generation unit of the photovoltaic power station is provided with a data acquisition device, the power set value of the power generation unit is issued to each inverter by the data acquisition device, and the process is realized by the data acquisition device.
As in the present example: calculated N Iall ＝50；N 1 To N 5 10.
P AN-1 ＝5500/50*10＝1100
P AN-2 ＝5500/50*10＝1100
……
P AN-5 ＝5500/50*10＝1100；
Starting timing for 1 minute, and after 1 minute arrives, executing S83;
s83, obtaining the minimum value delta P of the power deviation of the photovoltaic power station in the step 1 min Setting 300KW; the current power P of the photovoltaic power plant to be tested at the moment T1 AN 5500KW, wherein the generated power of the photovoltaic power station changes according to the real-time irradiation intensity, so that the real-time power P of the photovoltaic power station to be tested at the current T2 moment AO ≈P AN ＝5500，|P AO -P′ AO |＝|5500-6000|＝500＞ΔP min 300, returning to the step 5;
step 9, repeating the step 5 and the step 8, and gradually reducing the power of the photovoltaic power station to be tested until the power is |P AO -P′ AO |＜ΔP min And (3) ending, and finishing the power reduction operation of the photovoltaic power station.
Claims (9)
1. The power control method of the photovoltaic power station is characterized by comprising the following steps of:
step 1, obtaining basic data of a photovoltaic power station to be tested;
step 2, setting operation parameters of the photovoltaic power station to be tested;
step 3, calculating the active power change value of the photovoltaic power station to be tested and the total input quantity of the inverters of the photovoltaic power station to be tested;
step 4, controlling the power of the photovoltaic power station according to the real-time power of the photovoltaic power station and the power target set value of the photovoltaic power station by combining the active power change value of the photovoltaic power station to be tested and the total input quantity of the inverters, which are obtained in the step 3;
in step 3, the total input quantity of the inverter of the photovoltaic power station to be tested is calculated by the following formula, and the specific method is as follows:
wherein ,
the total input quantity of the inverters of the photovoltaic power station to be tested is calculated; />
Is->
An operation signal of each power generation unit; />
The number of power inputs for each power generation unit for the corresponding inverter, wherein->
，/>
Inverter operation signal for each power generation unit, < > for each power generation unit>
，/>
If the inverter is operating, then->
If the inverter is not operating, +.>
；/>
The number of the power generation units of the photovoltaic power station to be tested is the number of the power generation units of the photovoltaic power station to be tested; />
And the number of inverters of the photovoltaic power station to be tested.
2. The method according to claim 1, wherein in step 1, the obtaining basic data of the photovoltaic power plant to be tested includes the number of power generation units, the number of inverters, the maximum design power of the photovoltaic power plant to be tested, the maximum design power of each power generation unit, the maximum design power of each inverter, and the maximum change rate of 1 minute of active power of the photovoltaic power plant to be tested.
3. The method according to claim 1, wherein the step 2 of setting the operation parameters of the photovoltaic power plant to be tested includes an active power change rate set value of the photovoltaic power plant to be tested, a power deviation minimum value of the photovoltaic power plant to be tested, and a power target set value of the photovoltaic power plant to be tested.
4. The method according to claim 1, wherein in step 3, the active power variation value of the photovoltaic power plant to be measured is calculated by the following formula:
wherein ,
the active power change value of the photovoltaic power station to be tested is; />
The maximum value of the change rate of the active power of the photovoltaic power station to be tested for 1 minute; />
And setting a value for the change rate of the active power of the photovoltaic power station to be tested.
5. The method for controlling power of a photovoltaic power plant according to claim 1, wherein in step 4, the power of the photovoltaic power plant to be tested is calculated according to the real-time power of the photovoltaic power plant to be tested and the target set value of the power of the photovoltaic power plant to be tested by combining the active power variation value of the photovoltaic power plant to be tested and the total input quantity of the inverters obtained in step 3, and the specific method is as follows:
s41, comparing the difference value between the real-time power of the photovoltaic power station to be tested and the power target set value of the photovoltaic power station to be tested with a threshold value, and judging whether the photovoltaic power station to be tested performs power up operation or power down operation according to the comparison result;
and S42, controlling the photovoltaic power station to be tested to perform power up operation or power down operation according to the active power change value of the photovoltaic power station to be tested and the total input quantity of the inverters, which are obtained in the step 3.
6. The method for controlling power of a photovoltaic power plant according to claim 5, wherein the difference between the real-time power of the photovoltaic power plant to be tested and the target set value of the power of the photovoltaic power plant to be tested is compared with a threshold value, and the photovoltaic power plant to be tested is judged to perform power up operation or power down operation according to the comparison result, and the specific method is as follows:
if the difference value between the real-time power of the photovoltaic power station to be tested and the power target set value of the photovoltaic power station to be tested is greater than or equal to a threshold value, the photovoltaic power station to be tested performs power-up operation;
and if the difference value between the real-time power of the photovoltaic power station to be tested and the power target set value of the photovoltaic power station to be tested is smaller than the threshold value, the photovoltaic power station to be tested performs power reduction operation.
7. The method for controlling power of a photovoltaic power plant according to claim 5, wherein the method for controlling the photovoltaic power plant to be tested to perform power up operation according to the active power variation value of the photovoltaic power plant to be tested and the total input quantity of the inverters obtained in step 3 comprises the following specific steps:
S421A, calculating the current downlink power of the photovoltaic power station to be tested according to the following formula:
wherein ,
the current power of the photovoltaic power station to be tested is given out; />
The active power change value of the photovoltaic power station to be tested is; />
Real-time power of the photovoltaic power station to be tested;
S422A, calculating a power set value corresponding to each power generation unit according to the obtained current power output of the photovoltaic power station to be tested;
S423A, calculating the real-time power of the photovoltaic power station to be tested at the current moment according to the obtained power set value corresponding to each power generation unit;
S424A, comparing the difference value between the real-time power of the photovoltaic power station to be tested at the current moment and the real-time power of the photovoltaic power station to be tested at the previous moment with the power deviation minimum value of the photovoltaic power station to be tested, wherein if the difference value between the real-time power of the photovoltaic power station to be tested at the current moment and the real-time power of the photovoltaic power station to be tested at the previous moment is more than or equal to the power deviation minimum value of the photovoltaic power station to be tested, returning to S421A; otherwise, the photovoltaic power station to be tested finishes the power-up operation.
8. The method for controlling power of a photovoltaic power plant according to claim 5, wherein the method for controlling the photovoltaic power plant to be tested to perform or perform power reduction operation according to the active power variation value of the photovoltaic power plant to be tested and the total input quantity of the inverters obtained in step 3 comprises the following specific steps:
S421B, calculating the current downlink power of the photovoltaic power station to be tested according to the following formula:
wherein ,
the current power of the photovoltaic power station to be tested is given out; />
The active power change value of the photovoltaic power station to be tested is; />
Real-time power of the photovoltaic power station to be tested;
S422B, calculating a power set value corresponding to each power generation unit according to the obtained current power output of the photovoltaic power station to be tested;
S423B, calculating the real-time power of the photovoltaic power station to be tested at the current moment according to the obtained power set value corresponding to each power generation unit;
S424B, comparing the difference between the real-time power of the photovoltaic power station to be tested at the current moment and the real-time power of the photovoltaic power station to be tested at the previous moment with the power deviation minimum value of the photovoltaic power station to be tested, wherein if the difference between the real-time power of the photovoltaic power station to be tested at the current moment and the real-time power of the photovoltaic power station to be tested at the previous moment is more than or equal to the power deviation minimum value of the photovoltaic power station to be tested, returning to S421B; otherwise, the photovoltaic power station to be tested finishes the power-up operation.
9. A photovoltaic plant power control system, characterized in that it is capable of operating the method of any one of claims 1-8, comprising:
the data acquisition unit is used for acquiring basic data of the photovoltaic power station to be tested;
the parameter setting unit is used for setting the operation parameters of the photovoltaic power station to be tested;
the parameter calculation unit is used for calculating the active power change value of the photovoltaic power station to be tested and the total input quantity of the inverters of the photovoltaic power station to be tested;
and the power control unit is used for controlling the power of the photovoltaic power station according to the real-time power of the photovoltaic power station and the power target set value of the photovoltaic power station and combining the obtained active power change value of the photovoltaic power station to be tested and the total input quantity of the inverters.
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| CN105978043B (en) * | 2016-06-21 | 2018-07-24 | 天津大学 | Photovoltaic plant multi-inverter active power controller method |
| CN111654059A (en) * | 2020-05-27 | 2020-09-11 | 国网天津市电力公司电力科学研究院 | Photovoltaic power station AGC control optimization method based on inverter classification control |
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Effective date of registration: 20231213 Address after: 102209 building a, Huaneng talent innovation and entrepreneurship base, Beiqijia future science and Technology City, Changping District, Beijing Patentee after: HUANENG CLEAN ENERGY Research Institute Patentee after: Huaneng Jilin Power Generation Co.,Ltd. Address before: 102209 building a, Huaneng talent innovation and entrepreneurship base, Beiqijia future science and Technology City, Changping District, Beijing Patentee before: HUANENG CLEAN ENERGY Research Institute |