CN113394822B - Active adjustable upper limit calculation method for primary frequency modulation system of new energy station - Google Patents
Active adjustable upper limit calculation method for primary frequency modulation system of new energy station Download PDFInfo
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- CN113394822B CN113394822B CN202110573554.0A CN202110573554A CN113394822B CN 113394822 B CN113394822 B CN 113394822B CN 202110573554 A CN202110573554 A CN 202110573554A CN 113394822 B CN113394822 B CN 113394822B
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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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
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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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
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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
- H02J2300/28—The renewable source being wind energy
Abstract
The invention discloses a method for calculating an active adjustable upper limit of a primary frequency modulation system of a new energy station, which comprises the following steps of: 1) partitioning the units of the station; 2) selecting a sample board machine in each partition according to the quantity weight; 3) acquiring instantaneous active power of all the sample boards in the step 2) and respectively calculating the average instantaneous active power of each subarea sample board; 4) calculating the active adjustable upper limit values of all units according to the weight of the sample board computer; 5) and calculating the active adjustable upper limit of the primary frequency modulation system according to the impedance and the voltage. The calculation accuracy of the active adjustable upper limit of the primary frequency modulation system can be improved without influencing the active control capability of the power station.
Description
Technical Field
The invention belongs to the technical field of power electronic systems, and particularly relates to a method for calculating an active adjustable upper limit of a primary frequency modulation system of a new energy station.
Background
A high-proportion power electronic system is connected into a power grid, so that the installed proportion of a thermal power generating unit of the power grid is reduced, the rotating reserve capacity is reduced, the frequency adjustment and the stable control are increasingly difficult, and a new energy station is required to participate in primary frequency modulation of the power grid. The active adjustable upper limit needs to be calculated when the new energy station participates in the primary frequency modulation process, and the accuracy of the primary frequency modulation instruction is affected by the active adjustable upper limit. The traditional calculation of the active adjustable upper limit is to obtain the active adjustable upper limit by selecting one to two sample computers, and the actual situation is that the power generation capacity of each photovoltaic array is different, each fan is influenced by the position, the power generation capacity is different, and difficulty is brought to the calculation of the active adjustable upper limit. More sample boards are selected to increase accuracy, but the sample boards are not controllable, and the active control capability of the power station is influenced.
Disclosure of Invention
The method for calculating the active adjustable upper limit of the primary frequency modulation system of the new energy station improves the calculation accuracy of the active adjustable upper limit of the primary frequency modulation system without influencing the active control capability of a power station.
The technical scheme disclosed by the invention is as follows: a method for calculating an active adjustable upper limit of a primary frequency modulation system of a new energy station comprises the following steps:
1) partitioning the units of the station;
2) selecting a template machine in each partition according to the quantity weight;
3) acquiring instantaneous active power of all the sample board machines in the step 2) and respectively calculating the average instantaneous active power of each subarea sample board machine;
4) calculating the active adjustable upper limit values of all the units according to the weight of the sample board machine;
5) and calculating the active adjustable upper limit of the primary frequency modulation system according to the impedance and the voltage.
On the basis of the above scheme, preferably, in step 1), the output active power of the inverter or the wind turbine in the station is divided into 5 areas of an area a, an area B, an area C, an area D and an area E according to grades, and the number of the 5 area board sampling machines is respectively as follows: the number of the areas A is a, the number of the areas B is B, the number of the areas C is C, the number of the areas D is D, the number of the areas E is E, and the total number is N.
On the basis of the scheme, the total number of the selected panel machines is n as the optimization, the calculation method in each partition according to the number weight in the step 2) is as follows,
number of selected cells in area A
Number of block B selection stations
Number of selected cells in area C
Number of selected cells in block D
Number of selected cells in zone E
Total number of sample plate machines
On the basis of the scheme, preferably, the instantaneous active power of all the sample machines in the step 3) is collected, and the average instantaneous active power of the sample machines in the areas A, B, C, D and E is respectively calculated to be Pa, Pb, Pc, Pd and Pe.
On the basis of the above scheme, preferably, the active adjustable upper limit values of all the units in step 4) are calculated according to the sample board computer weight as follows:
On the basis of the above scheme, preferably, the active adjustable upper limit of the primary frequency modulation system is calculated according to the impedance and the voltage as follows:
assuming that the voltage level is U and the impedance is Res, the calculation method is as follows:
the known active formula calculates the impedance loss active Δ P:
By active power formula
The following can be obtained:
By using the principle of current equality, formula (9) can be substituted for formula (8):
The active adjustable upper limit Ps of the primary frequency modulation system is as follows:
Compared with the prior art, the invention has the following beneficial effects: the invention relates to a method for calculating an active adjustable upper limit of a power system, which comprises the steps of grouping the generating capacity of different units, selecting the sample boards with representative significance of each group, determining the number of the sample boards of each group by a weight method, calculating the active adjustable upper limit of the unit, and subtracting the active power consumed by system impedance to obtain the active adjustable upper limit of the system. The active adjustable upper limit value calculated by the method is not influenced by different generating capacities of the units of the new energy station and the active loss caused by system impedance, and the calculation result is accurate.
Drawings
FIG. 1 is a diagram of a unit generating capacity distribution;
fig. 2 is a block diagram of the system of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will be made with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, without inventive effort, other drawings and embodiments can be derived from them.
As shown in fig. 1-2, the first part: the power generation capacity of each photovoltaic array or fan of the new energy station meets normal distribution, and n representative sample boards can be selected according to the distribution characteristics and different weights. As shown in the figure, the statistics of the power generation capacity of a photovoltaic power plant with 100 inverters of 500kW are shown in fig. 1.
The output active power of the inverter or the fan is divided into 5 areas according to grades, namely an area A, an area B, an area C, an area D and an area E. The number of the areas A is a, the number of the areas B is B, the number of the areas C is C, the number of the areas D is D, the number of the areas E is E, the total number is N, and the number of the selected sample boards is N.
The calculation method comprises the following steps:
number of selected cells in area A
Number of selected cells in B block
Number of selected cells in block C
Number of selected cells in zone D
Number of selected cells in block E
N5= nxe/N formula (5)
Total number of sample plate machines
n = n1+ n2+ n3+ n4+ n5 formula (6)
And (3) collecting instantaneous active power of all the sample plate machines, and respectively calculating the average instantaneous active power Pa, Pb, Pc, Pd and Pe of the sample plate machines in the area A, the area B, the area C, the area D and the area E.
Calculating the active adjustable upper limit value of all units according to the weight of the sample board computer
Pg = N × (N1/N × Pa + N2/N × Pb + N3/N × Pc + N4/N × Pd + N5/N × Pe) formula (7)
A second part: the unit active adjustable upper limit Pg calculated in the first part is the inverter side, and the higher the active power of the system is, the greater the influence of impedance on the active power is. In order to accurately calculate the active adjustable upper limit of the primary frequency modulation system, the influence of system impedance needs to be removed. Assuming that the voltage level is U and the impedance is Res, the calculation method is as follows:
the known active formula calculates the impedance loss active Δ P:
By active power formula
The following can be obtained:
By using the principle of current equality, formula (9) can be substituted for formula (8):
Finally, calculating the active adjustable upper limit Ps of the primary frequency modulation system:
formula (11).
It should be noted that the above embodiments can be freely combined as necessary. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and amendments can be made without departing from the principle of the present invention, and these modifications and amendments should also be considered as the protection scope of the present invention.
Claims (1)
1. A method for calculating an active adjustable upper limit of a primary frequency modulation system of a new energy station is characterized by comprising the following steps:
1) partitioning the units of the station;
2) selecting a sample board machine in each partition according to the quantity weight;
3) acquiring instantaneous active power of all the sample boards in the step 2) and respectively calculating the average instantaneous active power of each subarea sample board;
4) calculating the active adjustable upper limit values of all units according to the weight of the sample board computer;
5) calculating the active adjustable upper limit of the primary frequency modulation system according to the impedance and the voltage;
in the step 1), the output active power capability of an inverter or a fan in the station is divided into 5 areas of an area A, an area B, an area C, an area D and an area E according to the grade, and the number of the 5 area sampling machines is respectively as follows: the number of the zones A is a, the number of the zones B is B, the number of the zones C is C, the number of the zones D is D, the number of the zones E is E, the total number is N,
the total number of the selected sample boards is n, the calculation method in each partition according to the number weight in the step 2) is as follows,
number of selected cells in area A
Number of block B selection stations
Number of selected cells in area C
Number of selected cells in zone D
Number of selected cells in zone E
Total number of sample plate machines
collecting instantaneous active power of all the sample plate machines in the step 3), respectively calculating average instantaneous active power Pa, Pb, Pc, Pd and Pe of the sample plate machines in the area A, the area B, the area C, the area D and the area E,
in the step 4), calculating the adjustable upper limit value of the active power of all the units according to the weight of the sample board machine as follows:
calculating the active adjustable upper limit of the primary frequency modulation system according to the impedance and the voltage as follows:
assuming that the voltage level is U and the impedance is Res, the calculation method is as follows:
the known active formula calculates the impedance loss active Δ P:
By active power formula
The following can be obtained:
By using the principle of current equality, formula (9) can be substituted for formula (8):
The active adjustable upper limit Ps of the primary frequency modulation system is as follows:
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300394A (en) * | 2016-11-04 | 2017-01-04 | 中国电力科学研究院 | The primary frequency modulation control method of a kind of new energy power station and system |
| CN110994640A (en) * | 2019-11-12 | 2020-04-10 | 国网电力科学研究院有限公司 | Primary frequency modulation control method, device and system for new energy station |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300394A (en) * | 2016-11-04 | 2017-01-04 | 中国电力科学研究院 | The primary frequency modulation control method of a kind of new energy power station and system |
| CN110994640A (en) * | 2019-11-12 | 2020-04-10 | 国网电力科学研究院有限公司 | Primary frequency modulation control method, device and system for new energy station |
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