CN114243730B - Method and device for configuring primary frequency modulation standby capacity of power supply after wind power grid connection - Google Patents
Method and device for configuring primary frequency modulation standby capacity of power supply after wind power grid connection Download PDFInfo
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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
- 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
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a method and a device for configuring primary frequency modulation standby capacity of a power supply after wind power grid connection. The method for configuring the primary frequency modulation standby capacity of the power supply after wind power grid connection comprises the following steps: applying disturbance to a power system, and obtaining quasi-steady-state frequency deviation and system loss power of the power system after the disturbance is applied; according to the quasi-steady state frequency deviation, counting the load primary frequency modulation spare capacity of the power system in each area to obtain the total load primary frequency modulation spare capacity; counting the load shedding capacity of each region after the power system applies the disturbance to obtain the total load shedding capacity; and obtaining the primary frequency modulation spare capacity of the power supply according to the system loss power, the total load primary frequency modulation spare capacity and the total load cut-off capacity. The invention can rapidly and accurately obtain the primary frequency modulation standby capacity of the power supply and improve the frequency stability of the power system.
Description
Technical Field
The invention relates to the technical field of frequency modulation of power systems, in particular to a method and a device for configuring primary frequency modulation standby capacity of a power supply after wind power grid connection.
Background
The primary frequency modulation is an automatic control process that a control system of a unit in a power system automatically controls the increase and decrease of active power of the unit once the frequency of the power system deviates from a rated value, and limits the frequency change of the power system so as to maintain the frequency of the power system stable.
In recent years, wind power generation develops rapidly, and a large number of wind turbines are connected into a power system. The conventional power supplies of the wind turbine generator and the power system, namely the conventional thermal power generation unit, the hydroelectric generating unit and the like have essential differences in the aspects of operation mechanism, external characteristics and the like, and under the condition that additional inertia control and primary frequency modulation control of the wind turbine generator are not considered, the frequency characteristic of the wind turbine generator without primary frequency modulation standby capacity can enable the primary frequency modulation standby capacity of the power supply after the wind turbine generator is connected into the power system to be reduced, and the frequency adjustment capacity of the power system is greatly reduced. And because of the characteristics of fluctuation, intermittence and the like of wind power, under partial high-power disturbance, the primary frequency modulation spare capacity of the conventional thermal power and hydroelectric generating set cannot be effectively adjusted, and the slow climbing phenomenon exists in the frequency recovery process, so that the frequency recovery speed is lower, and the primary frequency modulation performance is limited. Therefore, after the wind turbine generator system is connected to the power system, the primary frequency modulation standby capacity of the power system is greatly changed, and if the primary frequency modulation standby capacity of the power system cannot be obtained quickly and accurately, the frequency instability of the power system under high-power disturbance can be caused.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a method and a device for configuring the primary frequency modulation standby capacity of a power supply after wind power grid connection, which can rapidly and accurately obtain the primary frequency modulation standby capacity of the power supply and improve the frequency stability of a power system.
In order to solve the above technical problems, in a first aspect, an embodiment of the present invention provides a method for configuring primary frequency modulation spare capacity of a power supply after wind power grid connection, including:
Applying disturbance to a power system, and obtaining quasi-steady-state frequency deviation and system loss power of the power system after the disturbance is applied;
according to the quasi-steady state frequency deviation, counting the load primary frequency modulation spare capacity of the power system in each area to obtain the total load primary frequency modulation spare capacity;
Counting the load shedding capacity of each region after the power system applies the disturbance to obtain the total load shedding capacity;
And obtaining the primary frequency modulation spare capacity of the power supply according to the system loss power, the total load primary frequency modulation spare capacity and the total load cut-off capacity.
Further, the quasi-steady state frequency deviation is:
Δf＝ft1-ft2；
Wherein f t1 is the frequency before the disturbance is applied to the power system, and f t2 is the frequency after the disturbance is applied to the power system.
Further, the total load primary frequency modulation spare capacity is as follows:
Wherein i is the number of the region, n is the total number of all the regions, ΔP Li is the load primary frequency modulation spare capacity of the i-th region, L i is the load demand capacity of the ith area, x i is the active change percentage caused by 1% of frequency change, Δf is the quasi-steady-state frequency deviation, and f t1 is the frequency before the disturbance is applied to the power system.
Further, the total load shedding capacity is:
where i is the number of the region, n is the total number of all the regions, Capacity is cut off for the load of the i-th said region.
Further, the primary frequency modulation spare capacity of the power supply is as follows:
ΔPStotal＝ΔP-ΔPLtotal-ΔLloss；
wherein Δp is the system lost power, Δp Ltotal is the load primary frequency modulation reserve capacity total, Δl loss is the load cut capacity total.
In a second aspect, an embodiment of the present invention provides a power supply primary frequency modulation standby capacity configuration device after wind power grid connection, including:
the power system disturbance applying module is used for applying disturbance to the power system and acquiring quasi-steady-state frequency deviation and system loss power of the power system after the disturbance is applied;
The load primary frequency modulation spare capacity statistics module is used for counting the load primary frequency modulation spare capacity of the power system in each area according to the quasi-steady-state frequency deviation to obtain the total load primary frequency modulation spare capacity;
the load shedding capacity statistics module is used for counting the load shedding capacity of each area after the power system applies the disturbance to obtain the total load shedding capacity;
And the power supply primary frequency modulation spare capacity configuration module is used for obtaining the power supply primary frequency modulation spare capacity according to the system loss power, the total load primary frequency modulation spare capacity and the total load removal capacity.
Further, the quasi-steady state frequency deviation is:
Δf＝ft1-ft2；
Wherein f t1 is the frequency before the disturbance is applied to the power system, and f t2 is the frequency after the disturbance is applied to the power system.
Further, the total load primary frequency modulation spare capacity is as follows:
Wherein i is the number of the region, n is the total number of all the regions, ΔP Li is the load primary frequency modulation spare capacity of the i-th region, L i is the load demand capacity of the ith area, x i is the active change percentage caused by 1% of frequency change, Δf is the quasi-steady-state frequency deviation, and f t1 is the frequency before the disturbance is applied to the power system.
Further, the total load shedding capacity is:
where i is the number of the region, n is the total number of all the regions, Capacity is cut off for the load of the i-th said region.
Further, the primary frequency modulation spare capacity of the power supply is as follows:
ΔPStotal＝ΔP-ΔPLtotal-ΔLloss；
wherein Δp is the system lost power, Δp Ltotal is the load primary frequency modulation reserve capacity total, Δl loss is the load cut capacity total.
The embodiment of the invention has the following beneficial effects:
And obtaining quasi-steady-state frequency deviation and system loss power after the disturbance is applied to the power system by applying the disturbance to the power system, counting the load primary frequency modulation spare capacity of the power system in each area according to the quasi-steady-state frequency deviation to obtain the total load primary frequency modulation spare capacity, counting the load shedding capacity of the power system in each area after the disturbance is applied to the power system to obtain the total load shedding capacity, obtaining the power primary frequency modulation spare capacity according to the system loss power, the total load primary frequency modulation spare capacity and the total load shedding capacity, and completing configuration of the power primary frequency modulation spare capacity. Compared with the prior art, the embodiment of the invention simulates the primary frequency modulation process of the power system under high-power disturbance by applying the high-power disturbance to the power system, and according to the quasi-steady state frequency deviation after the power system is subjected to the disturbance, the total load primary frequency modulation spare capacity of the power system in all areas and the total load removal capacity of the power system in all areas after the power system is subjected to the disturbance are obtained through statistics, so that the primary frequency modulation spare capacity of the power supply is obtained according to the system loss power, the total load primary frequency modulation spare capacity and the total load removal capacity of the power system after the power system is subjected to the disturbance, and the primary frequency modulation spare capacity of the power supply can be obtained rapidly and accurately, and references are provided for power system planning and operation personnel to configure the primary frequency modulation spare capacity of the power supply, so that the frequency stability of the power system is improved, and the planning construction and the safe and stable operation of a wind turbine generator set connected into the power system are promoted.
Drawings
FIG. 1 is a flow chart of a method for configuring primary frequency modulation spare capacity of a power supply after wind power integration in a first embodiment of the invention;
Fig. 2 is a schematic diagram illustrating a frequency variation of the power system during primary frequency modulation according to the first embodiment of the present invention;
fig. 3 is a schematic structural diagram of a power primary frequency modulation spare capacity configuration device after wind power grid connection in a second embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made more apparent and fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, the step numbers herein are only for convenience of explanation of the specific embodiments, and are not used as limiting the order of execution of the steps. The method provided in this embodiment may be performed by a related terminal device, and the following description will take a processor as an execution body as an example.
As shown in fig. 1, a first embodiment provides a method for configuring primary frequency modulation standby capacity of a power supply after wind power grid connection, which includes steps S1 to S4:
s1, disturbance is applied to the power system, and quasi-steady-state frequency deviation and system loss power after the disturbance is applied to the power system are obtained.
The minimum capacity requirement of primary frequency modulation standby is set according to the safety target of the system after the whole network accident power is lacked, so that the reference to the 'safety and stability guidelines of the electric power system' can be made, and the high-power disturbance applied to the electric power system can be considered: and (3) the events of direct current bipolar locking, tripping of parallel double-circuit alternating current transmission lines, tripping of two generator sets with maximum single-plant capacity and the like.
In step S1, the frequency before the disturbance is applied to the electronic system is recorded or retrieved, high-power disturbance is applied to the electric system, the frequency after the disturbance is applied to the electric system is obtained when the frequency of the electric system tends to be stable, and the quasi-steady-state frequency deviation after the disturbance is applied to the electric system is calculated according to the frequency before the disturbance is applied to the electric system and the frequency after the disturbance is applied to the electric system, and meanwhile, the system loss power after the disturbance is applied to the electric system is recorded.
In a preferred embodiment, the quasi-steady state frequency deviation is:
Δf＝ft1-ft2 (1)；
Wherein f t1 is the frequency before the disturbance is applied to the power system, and f t2 is the frequency after the disturbance is applied to the power system.
As an example, the primary frequency modulation process of the power system can be roughly divided into three phases, wherein the first phase is that the power system has large power shortage, the frequency of the power system starts to fall, the primary frequency modulation acts along with the primary frequency modulation, and the frequency regulation effect of the load of the power system is added, so that the fall of the frequency is restrained at the lowest point, such as an a-B frequency change process in fig. 2; the second stage is that the primary frequency modulation continuous action is increased by the unit speed regulator and the servo system due to the frequency difference of the power system, and the frequency of the power system is gradually recovered, such as the B-C frequency change process in FIG. 2; the third stage is for the governor to stabilize the frequency of the power system at a quasi-steady state value through the damping effect of the control system, such as the C-D frequency variation process of FIG. 2.
Generally, the frequency of the power system can be restored to a stable value within 60s after the high-power disturbance, the quasi-steady-state frequency value of the 60s is recorded as f 60s, and if the frequency value before the high-power disturbance is generated is f 0s, the quasi-steady-state frequency deviation of the power system after the disturbance is applied is Δf=f 0s-f60s.
According to the embodiment, when the frequency of the power system tends to be stable under the action of high-power disturbance, the quasi-steady-state frequency deviation and the system loss power of the power system after the disturbance is applied can be obtained, the quasi-steady-state frequency deviation and the system loss power of the power system after the disturbance is applied can be accurately obtained, the subsequent quick and accurate obtaining of the primary frequency modulation standby capacity of the power supply is facilitated, and the frequency stability of the power system is improved.
And S2, counting the load primary frequency modulation spare capacity of the power system in each area according to the quasi-steady-state frequency deviation, and obtaining the total load primary frequency modulation spare capacity.
In step S2, according to the quasi-steady-state frequency deviation after the disturbance is applied to the power system, the load primary frequency modulation spare capacity of the power system in each area is calculated, and the load primary frequency modulation spare capacity of the power system in each area is counted, so as to obtain the total load primary frequency modulation spare capacity.
In a preferred embodiment, the total amount of load primary spare capacity is:
Wherein i is the number of the region, n is the total number of all the regions, deltaP Li is the load primary frequency modulation spare capacity of the i-th region, L i is the load demand capacity of the ith area, x i is the active change percentage caused by 1% of frequency change, Δf is the quasi-steady-state frequency deviation, and f t1 is the frequency before disturbance is applied to the power system.
As an example, the load demand capacity of the power system in each region and the active change percentage caused by 1% of the frequency change are taken, and the load primary frequency modulation standby capacity of the power system in each region is calculated respectively in combination with the quasi-steady-state frequency deviation of the power system after disturbance is applied, for example, the load demand capacity of the region 1 is L 1, the active change percentage caused by 1% of the frequency change is x 1, and then the load primary frequency modulation standby capacity of the power system in the region 1 isAccording to the operation, the load primary frequency modulation standby capacity/>, of the power system in the region n is calculatedAfter calculating the load primary frequency modulation spare capacity of the power system in all areas, summing the load primary frequency modulation spare capacities, namely/>The total load primary frequency modulation spare capacity delta P Ltotal is obtained.
And S3, calculating the load shedding capacity of each area after the disturbance is applied to the power system, and obtaining the total load shedding capacity.
In step S3, the load shedding capacity of each area after the disturbance is applied to the power system is obtained, and the load shedding capacity of each area after the disturbance is applied to the power system is counted, so as to obtain the total load shedding capacity.
In a preferred embodiment, the total load shedding capacity is:
where i is the number of the region, n is the total number of all regions, Capacity is cut for the load of the i-th zone.
Illustratively, the load shedding capacity of each zone after the disturbance is applied by the power system is invoked, e.g., the load shedding capacity of zone 1 after the disturbance is applied by the power system isLoad shedding capacity in region 2 is/>… The load shedding capacity in region n is/>Summing these load shedding capacities, i.eThe total load shedding capacity Δl loss is obtained.
And S4, obtaining the primary frequency modulation spare capacity of the power supply according to the total system loss power, the total load primary frequency modulation spare capacity and the total load removal capacity.
In step S4, when the system loss power is recorded, the total load primary frequency modulation spare capacity and the total load shedding capacity are counted, and the system loss power, the total load primary frequency modulation spare capacity and the total load shedding capacity are differenced, so as to calculate the primary frequency modulation spare capacity of the power supply.
In a preferred embodiment, the primary power supply spare capacity is:
ΔPStotal＝ΔP-ΔPLtotal-ΔLloss (4)；
Where Δp is the system lost power, Δp Ltotal is the total load primary trim spare capacity, Δl loss is the total load shedding capacity.
In the embodiment, the power supply primary frequency modulation spare capacity can be obtained by obtaining the total system loss power, the total load primary frequency modulation spare capacity and the total load removal capacity and making the total system loss power, the total load primary frequency modulation spare capacity and the total load removal capacity different, and the power supply primary frequency modulation spare capacity can be obtained quickly and accurately only by adopting subtraction operation.
According to the first embodiment, a primary frequency modulation process of the power system under high-power disturbance is simulated by applying the high-power disturbance to the power system, the total load primary frequency modulation standby capacity of the power system in all areas and the total load removal capacity of the power system in all areas after the disturbance is applied are obtained through statistics according to quasi-steady state frequency deviation of the power system after the disturbance is applied, and then the power primary frequency modulation standby capacity is obtained according to the total system loss power, the total load primary frequency modulation standby capacity and the total load removal capacity of the power system after the disturbance is applied, so that the power primary frequency modulation standby capacity can be obtained quickly and accurately, references are provided for power system planning and operating personnel to configure the power primary frequency modulation standby capacity, and therefore the frequency stability of the power system is improved, and planning construction and safe and stable operation of a wind turbine generator system accessing into the power system are promoted.
In order to more clearly illustrate the configuration method of the primary frequency modulation spare capacity of the power supply after wind power grid connection provided by the first embodiment, taking four provinces of Guangdong, guangxi, guizhou and Hainan as examples, the configuration process of the primary frequency modulation spare capacity of the power supply after wind power is connected into the power system is specifically as follows:
Applying a high power disturbance to the power system causes the power system to generate a kun Liu Longzhi flow bipolar latch-up, resulting in a total power loss of 8000MW, i.e., system loss power Δp=8000.
The frequency f 0s =50.00 HZ before the disturbance is applied to the power system, the frequency of the power system is restored to a stable value after 60s of bipolar blocking of the current of the power system Liu Longzhi occurs, namely, the frequency f 60s =49.80 HZ after the disturbance is applied to the power system, and then the quasi-steady-state frequency deviation Δf=50-49.80=0.20 HZ according to the formula (1).
The load demand capacity of the power system at four provinces is called for as shown in table 1.
TABLE 1
| Province area | Guangdong aspect | Guangxi province (China) | Guizhou (Guizhou) | Hainan of Hainan |
| Load demand capacity | 164507MW | 38989MW | 28383MW | 9435MW |
As can be seen from table 1, the power system has a load demand capacity of L 1 = 164507MW in guangdong, a load demand capacity of L 2 = 38989MW in guangxi, a load demand capacity of L 3 = 28383MW in Guizhou, and a load demand capacity of L 4 =9435 MW in Hainan.
The percentage of active change in the power system caused by a 1% change in frequency in the four provinces is taken as shown in table 2.
TABLE 2
| Province area | Guangdong aspect | Guangxi province (China) | Guizhou (Guizhou) | Hainan of Hainan |
| Percentage of active change due to 1% frequency change | 1.8 | 1.2 | 1.2 | 2 |
The power system has an active change percentage x 1 =1.8 caused by 1% of frequency change in Guangdong, an active change percentage x 2 =1.2 caused by 1% of frequency change in Guangxi, an active change percentage x 3 =1.2 caused by 1% of frequency change in Guizhou, and an active change percentage x 4 =2 caused by 1% of frequency change in Hainan. The primary load frequency modulation reserve capacity of the power system in four provinces is calculated according to the active change percentage caused by the load demand capacity and the frequency change of the power system in each province by 1% and the quasi-steady-state frequency deviation after the power system is subjected to disturbance, and is shown in table 3.
TABLE 3 Table 3
Based on table 3, according to formula (2), when the quasi-steady-state frequency deviation Δf=0.20 HZ, the load primary spare capacity total Δp Ltotal =1618mw.
The load shedding capacity at four provinces after the disturbance applied by the power system is invoked, as shown in table 4.
TABLE 4 Table 4
| Province area | Guangdong aspect | Guangxi province (China) | Guizhou (Guizhou) | Hainan of Hainan |
| Load shedding capacity | 2400MW | 0 | 0 | 0 |
Based on table 4, it can be seen from equation (3) that the total load shedding capacity Δl loss =2400 MW.
According to formula (4), the primary power supply spare capacity Δp Stotal = 8000-1618-2400 =3982 MW is calculated.
Based on the same inventive concept as the first embodiment, a second embodiment provides a power primary frequency modulation standby capacity configuration device after wind power grid connection as shown in fig. 3, including: the power system disturbance applying module 21 is used for applying disturbance to the power system and acquiring quasi-steady-state frequency deviation and system loss power after the power system is subjected to disturbance; the load primary frequency modulation spare capacity statistics module 22 is configured to count the load primary frequency modulation spare capacity of the power system in each area according to the quasi-steady-state frequency deviation, so as to obtain a total load primary frequency modulation spare capacity; the load shedding capacity statistics module 23 is used for counting the load shedding capacity of each area after the disturbance is applied to the power system, so as to obtain the total load shedding capacity; the primary frequency modulation spare capacity configuration module 24 is configured to obtain primary frequency modulation spare capacity according to the system loss power, the total load primary frequency modulation spare capacity and the total load removal capacity.
In a preferred embodiment, the quasi-steady state frequency deviation is:
Δf＝ft1-ft2；
Wherein f t1 is the frequency before the disturbance is applied to the power system, and f t2 is the frequency after the disturbance is applied to the power system.
In a preferred embodiment, the total amount of load primary spare capacity is:
Wherein i is the number of the region, n is the total number of all the regions, deltaP Li is the load primary frequency modulation spare capacity of the i-th region, L i is the load demand capacity of the ith area, x i is the active change percentage caused by 1% of frequency change, Δf is the quasi-steady-state frequency deviation, and f t1 is the frequency before disturbance is applied to the power system.
In a preferred embodiment, the total load shedding capacity is:
where i is the number of the region, n is the total number of all regions, Capacity is cut for the load of the i-th zone.
In a preferred embodiment, the primary power supply spare capacity is:
ΔPStotal＝ΔP-ΔPLtotal-ΔLloss；
Where Δp is the system lost power, Δp Ltotal is the total load primary trim spare capacity, Δl loss is the total load shedding capacity.
In summary, the embodiment of the invention has the following beneficial effects:
And obtaining quasi-steady-state frequency deviation and system loss power after the disturbance is applied to the power system by applying the disturbance to the power system, counting the load primary frequency modulation spare capacity of the power system in each area according to the quasi-steady-state frequency deviation to obtain the total load primary frequency modulation spare capacity, counting the load shedding capacity of the power system in each area after the disturbance is applied to the power system to obtain the total load shedding capacity, obtaining the power primary frequency modulation spare capacity according to the system loss power, the total load primary frequency modulation spare capacity and the total load shedding capacity, and completing configuration of the power primary frequency modulation spare capacity. According to the embodiment of the invention, a primary frequency modulation process of the power system under high-power disturbance is simulated by applying the high-power disturbance to the power system, the total amount of the primary frequency modulation standby capacity of the power system in all areas and the total amount of the load shedding capacity of the power system in all areas after the disturbance is applied are counted according to the quasi-steady-state frequency deviation of the power system after the disturbance is applied, and then the primary frequency modulation standby capacity of the power supply is obtained according to the total amount of the system loss power, the primary frequency modulation standby capacity of the load and the total amount of the load shedding capacity after the disturbance is applied to the power system, so that the primary frequency modulation standby capacity of the power supply can be rapidly and accurately obtained, and references are provided for power system planning and operating personnel to configure the primary frequency modulation standby capacity of the power system, so that the frequency stability of the power system is improved, and the planning construction and the safe and stable operation of a wind turbine generator set connected into the power system are promoted.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Those skilled in the art will appreciate that implementing all or part of the above-described embodiments may be accomplished by way of computer programs, which may be stored on a computer readable storage medium, which when executed may comprise the steps of the above-described embodiments. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a random-access Memory (Random Access Memory, RAM), or the like.
Claims (4)
1. A power supply primary frequency modulation standby capacity configuration method after wind power grid connection is characterized by comprising the following steps:
Applying disturbance to a power system, and obtaining quasi-steady-state frequency deviation and system loss power of the power system after the disturbance is applied;
according to the quasi-steady state frequency deviation, counting the load primary frequency modulation spare capacity of the power system in each area to obtain the total load primary frequency modulation spare capacity;
Wherein the total load primary frequency modulation spare capacity The method comprises the following steps:
；
where i is the number of the region, n is the total number of all the regions, Primary frequency modulation spare capacity for load of the ith said area,/>L i is the load demand capacity of the ith said region, x i is the percentage of active change due to 1% change in frequency,/>For the quasi-steady state frequency deviation, f t1 is the frequency before the disturbance is applied to the power system;
Counting the load shedding capacity of each region after the power system applies the disturbance to obtain the total load shedding capacity;
wherein the total load shedding capacity The method comprises the following steps:
；
where i is the number of the region, n is the total number of all the regions, Load shedding capacity for the i-th said region;
obtaining primary frequency modulation spare capacity of a power supply according to the system loss power, the total load primary frequency modulation spare capacity and the total load cut-off capacity; wherein, the primary frequency modulation spare capacity of the power supply The method comprises the following steps: In the above, the ratio of/> Power is lost for the system,/>For the total amount of load primary frequency modulation reserve capacity,/>The total amount of capacity is cut off for the load.
2. The method for configuring primary frequency modulation spare capacity of a power supply after wind power grid connection according to claim 1, wherein the quasi-steady-state frequency deviation is:
；
Wherein f t1 is the frequency before the disturbance is applied to the power system, and f t2 is the frequency after the disturbance is applied to the power system.
3. The utility model provides a power primary frequency modulation spare capacity configuration device after wind-powered electricity generation is incorporated into power networks which characterized in that includes:
the power system disturbance applying module is used for applying disturbance to the power system and acquiring quasi-steady-state frequency deviation and system loss power of the power system after the disturbance is applied;
The load primary frequency modulation spare capacity statistics module is used for counting the load primary frequency modulation spare capacity of the power system in each area according to the quasi-steady-state frequency deviation to obtain the total load primary frequency modulation spare capacity;
Wherein the total load primary frequency modulation spare capacity The method comprises the following steps:
；
where i is the number of the region, n is the total number of all the regions, Primary frequency modulation spare capacity for load of the ith said area,/>L i is the load demand capacity of the ith said region, x i is the percentage of active change due to 1% change in frequency,/>For the quasi-steady state frequency deviation, f t1 is the frequency before the disturbance is applied to the power system;
the load shedding capacity statistics module is used for counting the load shedding capacity of each area after the power system applies the disturbance to obtain the total load shedding capacity;
wherein the total load shedding capacity The method comprises the following steps:
；
where i is the number of the region, n is the total number of all the regions, Load shedding capacity for the i-th said region;
The power supply primary frequency modulation spare capacity configuration module is used for obtaining power supply primary frequency modulation spare capacity according to the system loss power, the total load primary frequency modulation spare capacity and the total load removal capacity; wherein, the primary frequency modulation spare capacity of the power supply The method comprises the following steps: /(I)In the above, the ratio of/>Power is lost to the system in question,For the total amount of load primary frequency modulation reserve capacity,/>The total amount of capacity is cut off for the load.
4. The power supply primary frequency modulation spare capacity allocation device after wind power grid connection according to claim 3, wherein the quasi-steady state frequency deviation is:
；
Wherein f t1 is the frequency before the disturbance is applied to the power system, and f t2 is the frequency after the disturbance is applied to the power system.
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