CN115313528A - AGC active power adjusting method for new energy power station - Google Patents
AGC active power adjusting method for new energy power station Download PDFInfo
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- CN115313528A CN115313528A CN202211238286.8A CN202211238286A CN115313528A CN 115313528 A CN115313528 A CN 115313528A CN 202211238286 A CN202211238286 A CN 202211238286A CN 115313528 A CN115313528 A CN 115313528A
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- 230000033228 biological regulation Effects 0.000 claims abstract description 35
- 230000001105 regulatory effect Effects 0.000 claims abstract description 19
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- 238000012986 modification Methods 0.000 claims description 5
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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
- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention relates to the technical field of automatic control of power stations, and particularly discloses an AGC active power adjusting method for a new energy power station, which comprises the following steps: modeling each PLC device and setting device parameters; judging whether the total issued power exceeds the sum of the upper power limits of the generated power of each device, if so, distributing according to the upper power limits of the generated power of each device, otherwise, collecting the current generated power of each device, and calculating the difference between the total issued power and the sum of the current generated power of each device to be used as the power to be regulated; calculating the adjustable power ratio of each device, sequencing the adjustable power ratios according to the priority from large to small, and distributing the power to be adjusted to each device according to the priority of each device until the distribution is finished; and calculating the set point power according to the distribution result, issuing a power regulation command according to the set point power and executing. The invention can minimize the number of times of PLC equipment adjustment under the condition of meeting the total power transmitted by the power station, and is beneficial to improving the response speed and prolonging the service life of the equipment.
Description
Technical Field
The invention relates to the technical field of automatic control of power stations, in particular to an AGC active power adjusting method for a new energy power station.
Background
Currently, there is no clear national standard or industry standard about a method for distributing active power of an inverter PLC by an Automatic Generation Control (AGC) of a new energy power station, and each equipment manufacturer provides a power distribution algorithm according to its own product characteristics. From the existing data, the traditional power equalization adjustment algorithm is relatively simple, the problems are considered relatively, the target generated power of each inverter is distributed according to the proportion of the maximum generated power of the inverter in the total maximum generated power, and when the total issued power of AGC changes, all inverters in a station need to be adjusted, so that the adjustment frequency of the inverters is too frequent, and the service life of equipment is influenced.
Disclosure of Invention
The invention aims to provide an AGC active power adjusting method for a new energy power station, which can meet the requirement that the total output power of the AGC of the power station meets the requirement, can adjust according to the principle that the total adjusting times of an inverter are minimum, is beneficial to prolonging the service life of inverter equipment and promotes the long-term stable and efficient operation of the power station.
The invention achieves the above purpose through the following technical scheme:
an AGC active power adjusting method for a new energy power station comprises the following steps:
(1) Modeling each inverter PLC device in the AGC of the power station, and setting parameters of the PLC related devices;
(2) Judging total power P of AGC issued of power station agc Whether or not the generated power of each PLC device is exceededIf so, performing power distribution according to the upper limit of the generated power of each PLC device, and entering the step (5), otherwise, entering the step (3);
(3) Collecting the current generating power P of each PLC device in real time, and calculating the sum P of the current generating power of each PLC device sum And calculating the total AGC issued power P of the power station agc The sum P of the current generated power of each PLC device sum Difference value P of diff As power to be regulated;
(4) Calculating the adjustable power ratio R of each PLC device, sequencing the adjustable power ratios R from large to small according to priority, and arranging the power P to be adjusted diff Sequentially distributing the power P to the PLC devices according to the priority of each PLC device until the power P to be regulated diff All the distribution is finished;
(5) And calculating the set point power of each inverter PLC according to the distribution result, and issuing a power regulation command to each PLC device according to the set point power and executing.
In a further improvement, the PLC device parameter includes an upper power limit P max Lower power limit P min Adjusting dead zone P dead Single maximum adjustment Δ P max And an active power regulation rate V.
The further improvement is that, in the step (4), the specific step of calculating the adjustable power ratio R of each PLC device is as follows:
when the power P to be regulated diff When the power ratio is more than 0, the representative power needs to be adjusted upwards, and the upward adjustable power ratio R of each PLC device i up Comprises the following steps:
when the power P to be regulated diff When the power is less than 0, the representative power needs to be adjusted downwards, and the downward adjustable power ratio R of each PLC device at the moment i down Comprises the following steps:
the further improvement is thatIn the step (4), when the power needs to be adjusted up, the upper power limit P of the PLC equipment is combined max Power P to be regulated diff Sequentially distributing the PLC equipment to each PLC equipment according to the priority of each PLC equipment; combining the lower power limit P of the PLC device when the power needs to be adjusted downwards min Power P to be regulated diff And sequentially distributing the PLC equipment to the PLC equipment according to the priority of the PLC equipment.
The further improvement is that in the step (5), when the set point power of each inverter PLC is calculated, the active power regulation rate V of each PLC device is combined, so that the power regulation command issued to each PLC device does not exceed the regulation capacity allowed by each inverter PLC.
The further improvement is that in the step (5), the set point power of each inverter PLC is corrected according to the PLC device parameters, and a power regulation command is issued to each PLC device according to the corrected set point power and is executed.
In a further improvement, the modifying comprises:
according to the single maximum adjustment quantity delta P max And (3) correcting: if the set point power is not more than the single maximum adjustment quantity delta P of the PLC equipment compared with the current generating power P max Then no correction is needed; if the single maximum adjustment quantity delta P is exceeded max If so, the set point power is corrected to the current generating power P plus the single maximum adjustment quantity delta P max 。
In a further improvement, the modifying comprises:
according to the regulation dead zone P dead And (5) correcting: if the set point power is not more than the current generating power P than the adjusting dead zone P of the PLC equipment dead Correcting the set point power to the current generating power P, and if the set point power exceeds the regulation dead zone P dead No correction is necessary.
The further improvement is that in the step (4), the adjustable power ratios R are prioritized from large to small by adopting a quick sorting method.
The further improvement is that the steps (2) - (5) are executed according to a preset period T at regular time, and the preset period T is more than or equal to 1s.
The invention has the beneficial effects that: the invention can minimize the number of times of adjusting the PLC equipment under the condition of meeting the total power transmitted by the AGC of the power station, namely if one PLC equipment can reach the target in each calculation period, two PLC equipments do not need to be adjusted, thus being beneficial to improving the response speed and prolonging the service life of the equipment.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
The present application will now be described in further detail with reference to the drawings, and it should be noted that the following detailed description is given for purposes of illustration only and should not be construed as limiting the scope of the present application, as these numerous insubstantial modifications and variations can be made by those skilled in the art based on the teachings of the present application.
As shown in fig. 1, an AGC active power adjusting method for a new energy power station includes the steps of:
(1) The method comprises the following steps of establishing a table building model for each inverter PLC device in the AGC of the power station, specifically: establishing a PLC equipment parameter table in a relational database, and setting PLC related equipment parameters including an upper power limit P max Lower power limit P min Adjusting dead zone P dead Single maximum adjustment Δ P max Active power regulation rate V, etc.; a PLC equipment data table is established in a real-time database and used for recording intermediate results and real-time data of AGC calculation, such as real-time power, set point power, adjustment times and the like;
(2) Judging total power P of AGC issued of power station agc (namely the target power required to be adjusted) is judged whether to exceed the sum of the upper limit of the generated power of each PLC device, if so, power distribution is carried out according to the upper limit of the generated power of each PLC device, and the step (5) is carried out, otherwise, the step (3) is carried out;
(3) The current generating power P of each PLC device is collected in real time, and the sum P of the current generating power of each PLC device is calculated sum And calculating the total AGC issued power P of the power station agc The sum P of the current generated power of each PLC device sum Difference value P of diff As power to be regulated;
(4) Calculating the adjustable power ratio R of each PLC device when the power P to be adjusted diff When the power ratio is more than 0, the representative power needs to be adjusted upwards, and the upward adjustable power ratio R of each PLC device i up Comprises the following steps:
the upward adjustable power ratio R is obtained by adopting a rapid sequencing method i up Sorting the priority according to the descending order, combining the upper power limit P of the PLC equipment max Power P to be regulated diff Sequentially distributing the power P to each PLC device according to the priority of each PLC device until the power P to be regulated diff All the distribution is finished;
in the invention, the specific steps of adopting a quick sorting method to sort the priority are as follows: the method comprises the following steps: firstly, an adjustable power ratio R is arbitrarily selected as a reference value, and usually the first or the last adjustable power ratio R is selected as the reference value; step two: respectively comparing the rest adjustable power ratio R with an adjustable power ratio R (reference value), placing the PLC equipment which is larger than the adjustable power ratio R (reference value) in front of the PLC equipment, placing the PLC equipment which is smaller than the adjustable power ratio R (reference value) in back of the PLC equipment, and dividing the rest PLC equipment into two parts according to the adjustable power ratio R (reference value); step three: and comparing and dividing the two parts of PLC equipment respectively according to the first step and the second step until the number of the two parts of PLC equipment divided finally is 1, namely finishing the priority ordering of the PLC equipment from big to small.
Similarly, when the power P to be regulated diff When the power is less than 0, the representative power needs to be adjusted downwards, and the downward adjustable power ratio R of each PLC device at the moment i down Comprises the following steps:
adopting a rapid sequencing method to adjust the downward adjustable power ratio R i down Sorting according to priority from big to small, and setting by combining with PLCLower limit of power P min Power P to be regulated diff Sequentially distributing the power P to the PLC devices according to the priority of each PLC device until the power P to be regulated diff All the distribution is finished;
(5) Calculating the set point power of each inverter PLC according to the distribution result, and combining the active power regulation rate V of each PLC device during calculation to ensure that the power regulation command issued to each PLC device does not exceed the regulation capacity allowed by each inverter PLC; and then, correcting the set point power of each inverter PLC according to the PLC equipment parameters, and issuing a power regulation command to each PLC equipment according to the corrected set point power and executing the power regulation command.
Wherein, the process of correction includes: according to the maximum adjustment amount delta P max And (5) correcting: if the set point power is not more than the single maximum adjustment quantity delta P of the PLC equipment compared with the current generating power P max Then no correction is needed; if the single maximum adjustment quantity delta P is exceeded max If so, the set point power is corrected to the current generating power P plus the single maximum adjustment quantity delta P max (ii) a According to the regulation dead zone P dead And (5) correcting: if the set point power is not more than the current generating power P than the adjusting dead zone P of the PLC equipment dead Correcting the set point power to the current generating power P, and if the set point power exceeds the regulation dead zone P dead No correction is necessary.
It should be noted that, the above steps (2) - (5) are executed periodically according to a preset period T ≧ 1s, such as 1s, 1.2s, 1.5s, 2s, and so on.
The following description will be made by taking the case that the total power delivered by the AGC of the power station is greater than the current total power (up-regulation):
power P to be distributed diff =P agc –P sum =150-（40+40+40）=30（kW）
According to the scheme of the invention, the method for calculating the upward adjustable power ratio of each PLC respectively comprises the following steps:
and performing priority sequencing according to the adjustable power ratio and distributing the output power of each PLC as follows:
i.e. only the PLC needs to be adjusted 1 The total power target of AGC can be realized without adjusting PLC 2 And a PLC 3 。
If the power is distributed according to the existing distribution and adjustment mode, namely the proportion of the adjustable generated power of each PLC, the setpoint power of each PLC is respectively as follows:
it can be seen that each calculation of this algorithm requires adjustment of all PLC devices in the station, whereas the present invention requires only adjustment of the PLC devices 1 And (4) finishing.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the present invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention.
Claims (10)
1. An AGC active power adjusting method for a new energy power station is characterized by comprising the following steps:
(1) Modeling each inverter PLC device in the new energy power station, and setting PLC related device parameters;
(2) Judging total AGC (automatic gain control) issued power P of power station agc If the sum of the upper limit of the generated power of each PLC device is exceeded, performing power distribution according to the upper limit of the generated power of each PLC device if the sum of the upper limit of the generated power of each PLC device is exceeded, and entering the step (5), otherwise, entering the stepEntering the step (3);
(3) The current generating power P of each PLC device is collected in real time, and the sum P of the current generating power of each PLC device is calculated sum Calculating total AGC (automatic gain control) issued power P of the power station agc The sum P of the current generated power of each PLC device sum Difference value P of diff As power to be regulated;
(4) Calculating the adjustable power ratio R of each PLC device, sequencing the adjustable power ratios R from large to small according to priority, and arranging the power P to be adjusted diff Sequentially distributing the power P to each PLC device according to the priority of each PLC device until the power P to be regulated diff All the distribution is finished;
(5) And calculating the set point power of each inverter PLC according to the distribution result, and issuing a power regulation command to each PLC device according to the set point power and executing the power regulation command.
2. The AGC active power regulation method for the new energy power station as claimed in claim 1, wherein the PLC device parameters comprise an upper power limit P max Lower power limit P min Adjusting dead zone P dead Single maximum adjustment Δ P max And the active power regulation rate V.
3. The AGC active power regulation method for the new energy power station according to claim 2, wherein in the step (4), the specific step of calculating the adjustable power ratio R of each PLC device is as follows:
when the power P to be regulated diff When the power ratio is more than 0, the representative power needs to be adjusted upwards, and the upward adjustable power ratio R of each PLC device i up Comprises the following steps:
when the power P to be regulated diff When the power is less than 0, the representative power needs to be adjusted downwards, and the downward adjustable power ratio R of each PLC device at the moment i down Comprises the following steps:
4. the AGC active power regulation method for the new energy power station as claimed in claim 3, wherein in the step (4), when the power needs to be adjusted up, the upper power limit P of the PLC device is combined max Power P to be regulated diff Sequentially distributing the PLC equipment to each PLC equipment according to the priority of each PLC equipment; when the power needs to be adjusted downwards, the lower power limit P of the PLC equipment is combined min Power P to be regulated diff And sequentially distributing the PLC devices according to the priority of each PLC device.
5. The AGC active power regulation method for the new energy power station as claimed in claim 2, wherein in the step (5), when the setpoint power of each inverter PLC is calculated, the active power regulation rate V of each PLC device is combined, so that the power regulation command issued to each PLC device does not exceed the regulation capacity allowed by each inverter PLC.
6. The AGC active power regulation method for the new energy power station according to claim 2, wherein in the step (5), the setpoint power of each inverter PLC is corrected according to the PLC device parameters, and a power regulation command is issued to each PLC device according to the corrected setpoint power and is executed.
7. The AGC active power regulation method for the new energy power station according to claim 6, wherein the modification process comprises the following steps:
according to the maximum adjustment amount delta P max And (5) correcting: if the set point power is not more than the single maximum adjustment quantity delta P of the PLC equipment compared with the current generating power P max Then no correction is needed; if the single maximum adjustment quantity delta P is exceeded max Then the set point power is corrected to the current generating power P plus the single maximum adjustment delta P max 。
8. The AGC active power regulation method for the new energy power station according to claim 6, wherein the modification process comprises the following steps:
according to the regulation dead zone P dead And (5) correcting: if the set point power is not more than the current generating power P than the adjusting dead zone P of the PLC equipment dead Correcting the set point power to the current generating power P, and if the set point power exceeds the regulation dead zone P dead No correction is necessary.
9. The AGC active power regulation method for the new energy power station, according to claim 1, characterized in that in the step (4), the adjustable power ratios R are ranked in priority from large to small by adopting a quick ranking method.
10. The AGC active power regulation method for the new energy power station according to claim 1, wherein the steps (2) - (5) are executed regularly according to a preset period T, and the preset period T is more than or equal to 1s.
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