CN113095741A - Method and device for planning grid-connected capacity of power electronic power supply - Google Patents

Method and device for planning grid-connected capacity of power electronic power supply Download PDF

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CN113095741A
CN113095741A CN202110559738.1A CN202110559738A CN113095741A CN 113095741 A CN113095741 A CN 113095741A CN 202110559738 A CN202110559738 A CN 202110559738A CN 113095741 A CN113095741 A CN 113095741A
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王一鸣
高磊
宋瑞华
褚晓杰
孙华东
郭强
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China Electric Power Research Institute Co Ltd CEPRI
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Abstract

The invention discloses a method and a device for planning grid-connected capacity of a power electronic power supply, wherein the method comprises the following steps: determining a unified stability criterion USI of a power electronic power supply station, wherein the unified stability criterion USI of the power electronic power supply station comprises a dynamic unified stability criterion USI1And static unified stability criterion USI2(ii) a Based on the static unified stability criterion USI2Calculating the maximum planned capacity S of the power electronic power stationmax station k(ii) a Judging the dynamic unified stability criterion USI of the power electronic power station1Whether the dynamic safety stability standard is met or not, and when the dynamic unified stability criterion USI of the power electronic power supply station is met1If the dynamic safety stability standard is met, the maximum planned capacity S of the power electronic power station is setmax station kThe capacity plan is determined.

Description

Method and device for planning grid-connected capacity of power electronic power supply
Technical Field
The invention relates to the technical field of power system modeling, in particular to a method and a device for planning grid-connected capacity of a power electronic power supply.
Background
With the increasing scale of new energy installed in China, the traditional power system is showing a new characteristic of high-proportion power electronization. The research objects of the safety and stability of the power system are upgraded from the simple interaction between synchronous power supplies to the complex interaction between the synchronous power supplies, between asynchronous power supplies and between the synchronous power supplies and asynchronous power supplies.
The dynamic characteristics of the power electronic power supply station and the power electronic converter thereof are essentially different from those of the traditional power station, and the traditional power station maximum capacity planning method based on methods such as annual continuous power curves and the like is no longer suitable for the capacity planning work of the power electronic power supply station. However, at present, a power electronic power station (system) capacity planning technology and a method considering the safety and stability factors of a power system are rarely seen.
The short-circuit ratio can be used for analyzing the safety and stability of the power system when the power electronic system is connected to an alternating current power grid, but the existing short-circuit ratio analysis method can only represent the local system strength of a power electronic power supply grid-connected point, and does not consider the strong interaction between an asynchronous power supply and a synchronous power supply which possibly occurs when the capacity of a power electronic power supply station is changed. Therefore, the capacity planning method of the power electronic power station based on the existing short circuit ratio analysis method has great limitation.
In the prior art, a capacity planning method for a power electronic power supply station (area) mostly adopts a traditional power station maximum capacity planning method, and mainly comprises a power supply planning method based on a continuous load curve and a power supply planning method based on electric quantity balance. In the prior art, a capacity planning method for a traditional power station ignores dynamic characteristic differences of a power electronic power station and a power electronic converter thereof, so that safety and stability accidents of a power electronic system are frequent. In addition, the output of the power electronic power supply station has certain fluctuation and randomness, and the capacity planning result of the power electronic power supply station (area) based on the traditional power station planning method is often larger, so that the risk of oscillation accidents of a power system is further aggravated.
Therefore, a technique is needed to implement the planning of grid-connected capacity of power electronic power sources.
Disclosure of Invention
The technical scheme of the invention provides a method and a device for planning the grid-connected capacity of a power electronic power supply, which aim to solve the problem of planning the grid-connected capacity of the power electronic power supply.
In order to solve the above problem, the present invention provides a method for planning grid-connected capacity of a power electronic power supply, wherein the method comprises:
determining a unified stability criterion USI of a power electronic power supply station, wherein the unified stability criterion USI of the power electronic power supply station comprises a dynamic unified stability criterion USI1And static unified stability criterion USI2；
Based on the static unified stability criterion USI2Calculating the maximum planned capacity S of the power electronic power stationmax station k；
When the dynamic unified stability criterion USI of the power electronic power station1If the dynamic safety stability standard is met, the maximum planned capacity S of the power electronic power station is setmax station kThe capacity plan is determined.
Preferably, the method further comprises the following steps: when the dynamic unified stability criterion USI of the power electronic power station1If the dynamic safety stability standard is not met, the maximum planned capacity S of the power electronic power supply station is reducedmax station k。
Preferably, the method further comprises the following steps: and finishing the capacity planning of all power electronic power supply stations in the power electronic power supply area.
Preferably, the determining a unified stability criterion USI of the power electronic power station includes:
obtaining an equivalent open-loop transfer function G of the power system based on a linearized state equation of the power systemeq(s)；
For the equivalent open loop transfer function Geq(s) radius of the spectrumCalculating to obtain the dynamic unified stability criterion USI1And the static unified stability criterion USI2。
Preferably, the method further comprises the following steps: determining the dynamic unified stability criterion USI of a power electronic power supply station based on the small gain theorem1Safety stability criteria of (1).
Preferably, the maximum planned capacity S of the power electronic power supply station is calculatedmax station kThe method comprises the following steps:
Figure BDA0003078590790000031
wherein L iss,kIs the equivalent electrical distance, U, between the kth power electronic power station and the power systemg,kIs the bus voltage, omega, of the kth power electronic supply station0Is power frequency, USI, of an electric power system2| station kThe method is a static unified stability criterion of the kth power electronic power station.
Preferably, the method further comprises the following steps:
dynamic unified stability criterion USI for determining power electronic power supply area1；
When the dynamic unified stability criterion USI of the power electronic power supply area1If the dynamic safety stability standard is met, the maximum planned capacity S of the power electronic power station is setmax station kThe capacity plan is determined.
Based on another aspect of the present invention, the present invention provides an apparatus for grid-connected capacity planning of a power electronic power supply, the apparatus comprising:
an initial unit for determining a unified stability criterion USI of a power electronic power supply station, the unified stability criterion USI of the power electronic power supply station including a dynamic unified stability criterion USI1And static unified stability criterion USI2；
A computing unit for basing the static unified stability criterion USI2Calculating the maximum planned capacity S of the power electronic power stationmax station k；
A result unit for determining USI as dynamic unified stability criterion of the power electronic power station1If the dynamic safety stability standard is met, the maximum planned capacity S of the power electronic power station is setmax station kThe capacity plan is determined.
Preferably, the result unit is further configured to: when the dynamic unified stability criterion USI of the power electronic power station1If the dynamic safety stability standard is not met, the maximum planned capacity S of the power electronic power supply station is reducedmax station k。
Preferably, the result unit is further configured to: and finishing the capacity planning of all power electronic power supply stations in the power electronic power supply area.
Preferably, the initial unit is configured to determine a unified stability criterion USI of the power electronic power station, and includes:
obtaining an equivalent open-loop transfer function G of the power system based on a linearized state equation of the power systemeq(s)；
For the equivalent open loop transfer function Geq(s) performing spectrum radius operation to obtain the dynamic unified stability criterion USI1And the static unified stability criterion USI2。
Preferably, the initial unit is further configured to: determining the dynamic unified stability criterion USI of a power electronic power supply station based on the small gain theorem1Safety stability criteria of (1).
Preferably, the calculation unit is configured to calculate a maximum planned capacity S of the power electronic power stationmax station kThe method comprises the following steps:
Figure BDA0003078590790000041
wherein L iss,kIs the equivalent electrical distance, U, between the kth power electronic power station and the power systemg，kIs the bus voltage, omega, of the kth power electronic supply station0Is power frequency, USI, of an electric power system2| station kIs as followsAnd (5) determining the static unified stability of the k power electronic power supply stations.
Preferably, the initial unit is further configured to: dynamic unified stability criterion USI for determining power electronic power supply area1；
The result unit is further to: when the dynamic unified stability criterion USI of the power electronic power supply area1If the dynamic safety stability standard is met, the maximum planned capacity S of the power electronic power station is setmax station kThe capacity plan is determined.
The technical scheme of the invention provides a method and a device for planning grid-connected capacity of a power electronic power supply, wherein the method comprises the following steps: determining a unified stability criterion USI of a power electronic power supply station, wherein the unified stability criterion USI of the power electronic power supply station comprises a dynamic unified stability criterion USI1And static unified stability criterion USI2(ii) a Based on the static unified stability criterion USI2Calculating the maximum planned capacity S of the power electronic power stationmax station k(ii) a Judging the dynamic unified stability criterion USI of the power electronic power station1Whether the dynamic safety stability standard is met or not, and when the dynamic unified stability criterion USI of the power electronic power supply station is met1If the dynamic safety stability standard is met, the maximum planned capacity S of the power electronic power station is setmax station kThe capacity plan is determined.
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A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a flow chart of a method for planning grid-connected capacity of a power electronic power supply according to a preferred embodiment of the invention;
FIG. 2 is a schematic diagram of a model architecture of a power system in accordance with a preferred embodiment of the present invention;
FIG. 3 is a flow chart of a method for grid-connected capacity planning of a power electronic power supply according to a preferred embodiment of the present invention;
FIG. 4 is a schematic diagram of a single site (area) -infinite system model in accordance with a preferred embodiment of the present invention; and
fig. 5 is a structural diagram of an apparatus for grid-connected capacity planning of a power electronic power supply according to a preferred embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a flow chart of a method for planning grid-connected capacity of a power electronic power supply according to a preferred embodiment of the invention. The invention provides a power electronic power supply station (area) access capacity planning method based on a uniformity stability criterion, as shown in figure 1, the invention provides a power electronic power supply grid-connected capacity planning method, which comprises the following steps:
step 101: determining a unified stability criterion USI of the power electronic power supply station, the unified stability criterion USI of the power electronic power supply station comprising a dynamic unified stability criterion USI1And static unified stability criterion USI2；
Preferably, determining a unified stability criterion USI of the power electronic power station comprises:
obtaining an equivalent open-loop transfer function G of the power system based on a linearized state equation of the power systemeq(s)；
Equivalent open loop transfer function Geq(s) performing a spectral radius calculation,obtaining dynamic unified stability criterion USI1And static unified stability criterion USI2。
Preferably, the method further comprises the following steps: dynamic unified stability criterion USI for determining power electronic power supply station based on small gain theorem1Safety stability criteria of (1).
The invention, at step 101-1: establishing or identifying a linearized state equation of a high-proportion power electronic power system;
step 101-2: dynamic unified stability criterion USI of power electronic power station is provided1And static uniformity stability criterion USI2And making a corresponding stability judgment standard;
in step 101-1, a linear state equation of the power system based on a multivariate frequency domain control theory is established, and an equivalent open-loop transfer function G of the power system is obtainedeq(s)；
In step 101-2, an equivalent open-loop transfer function G is appliedeq(s) performing spectrum radius operation to obtain dynamic uniformity stability criterion USI of the power electronic power station1And static uniformity stability criterion USI2Further forming a uniformity stability criterion USI of the power electronic power station;
in step 101-2, a dynamic unification stability criterion USI of the power electronic power supply station is formulated based on a small gain theorem1Safety stability criteria of (1);
in step 101-2, a static uniformity stability criterion USI of the power electronic power station is formulated based on empirical values2Safety stability criteria of (1).
Step 102: based on static unified stability criterion USI2Calculating maximum planned capacity S of power electronic power stationmax station k；
Preferably, the maximum planned capacity S of the power electronic power supply station is calculatedmax station kThe method comprises the following steps:
Figure BDA0003078590790000061
wherein L iss,kIs the equivalent electrical distance, U, between the kth power electronic power station and the power systemg,kIs the bus voltage, omega, of the kth power electronic supply station0Is power frequency, USI, of an electric power system2| station kThe method is a static unified stability criterion of the kth power electronic power station.
The invention, in step 102: stability criterion USI based on static uniformity2Calculating maximum planned capacity S of power electronic power stationmax station k(ii) a In step 102, the maximum access capacity of the power electronic power supply station is planned when the power electronic power supply station is in a critical stable state. Maximum planned capacity S of kth power electronic power stationmax station kCan be calculated according to the following formula:
Figure BDA0003078590790000071
wherein L iss,kIs the equivalent electrical distance, U, between the kth power electronic power station and the power systemg,kIs the bus voltage of the kth power electronic power station.
Step 103: dynamic unified stability criterion USI for judging power electronic power supply station1Whether the dynamic safety stability standard is met or not, and when the dynamic unified stability criterion USI of the power electronic power supply station1When the dynamic safety stability standard is met, the maximum planned capacity S of the power electronic power station is setmax station kThe capacity plan is determined.
Preferably, the method further comprises the following steps: dynamic unified stability criterion USI of power electronic power station1If the dynamic safety stability standard is not met, the maximum planned capacity S of the power electronic power supply station is reducedmax station k。
The invention, in step 103: dynamic uniformity stability criterion USI for judging whether power electronic power station is met1Safety stability criteria of (1). If not, the capacity of the power electronic power station is reduced.
In step 103, the power under the maximum planned capacity condition is calculatedDynamic uniformity stability criterion USI of power electronic power station1And based on the USI1Safety stability criteria of (1);
if not, reducing the maximum programming capacity S of the kth power electronic power stationmax station kAnd repeating the above USI criterion1Until the dynamic uniformity stability criterion USI is satisfied1And (6) evaluating the standard.
Preferably, the method further comprises the following steps: and finishing the capacity planning of all power electronic power supply stations in the power electronic power supply area.
The invention repeats the steps until the capacity planning of all the power electronic power supply stations in the power electronic power supply area is completed.
In step 103, if the dynamic uniformity stability criterion USI is satisfied1According to the safety stability standard, the maximum planned capacity of the rest power electronic power supply stations in the power electronic power supply sub-area is continuously calculated according to the steps.
Preferably, the method further comprises:
dynamic unified stability criterion USI for determining power electronic power supply area1；
Dynamic unified stability criterion USI for judging power electronic power supply area1Whether the dynamic safety stability standard is met or not, and when the dynamic uniform stability criterion USI of the power electronic power supply area1When the dynamic safety stability standard is met, the maximum planned capacity S of the power electronic power station is setmax station kThe capacity plan is determined.
The invention calculates the dynamic uniformity stability criterion USI of the area1(ii) a In the step, all power electronic power supply stations in the power electronic power supply sub-area are integrated into the same system section, and the uniformity stability criterion USI of the system section is calculated.
The invention judges whether the dynamic uniformity stability criterion USI of the power electronic power supply area is met1Safety stability criteria of (1). If not, returning to the step 101 until all the power electronic power supply stations and areas meet the dynamic uniformity stability judgmentAccording to USI1And (5) safety and stability standard.
In the invention, the criterion USI is based on the dynamic uniformity stability1Judging the safety stability of the power electronic power supply subregion according to the safety stability standard;
dynamic uniformity stability criterion USI if power electronic power supply sub-area1If the evaluation standard is not met, the method returns to the step 101 to re-plan the maximum planned capacity S of each power electronic power stationmax station kUntil the dynamic uniformity stability criterion USI is satisfied1Safety stability criteria of (1).
The invention provides a power electronic power supply station (area) access capacity planning method based on a unified stability criterion USI, which has strict theoretical support and definite physical significance; the planning method for the access capacity of the power electronic power supply station (area) considers the dynamic process of the power electronic power supply station, and considers the stability of other power systems while evaluating the maximum access capacity of a target station; the planning method for the access capacity of the power electronic power supply station (area) provided by the invention has the advantages of simple calculation process and high accuracy, and meets the application requirements of an engineering field.
The following describes in further detail embodiments of the present invention with reference to the accompanying drawings.
The present invention will be described in further detail with reference to the practical power system shown in fig. 2 as an example. The flow chart of the invention is shown in fig. 3, and the method of the invention comprises the following specific steps:
step A: stability criterion USI based on static uniformity2Calculating the maximum planned capacity of the power electronic power supply station;
and B: dynamic uniformity stability criterion USI for calculating power electronic power station1；
And C: judging whether the power electronic power station meets the USI criterion1Safety stability criteria of (1);
step D: calculating the maximum planned capacity S of all power electronic power supply stations in the target power electronic power supply subregionmax station kComprises that：
Figure BDA0003078590790000091
Wherein L iss,kIs the equivalent electrical distance, U, between the kth power electronic power station and the power systemg，kIs the bus voltage, omega, of the kth power electronic supply station0Is power frequency, USI, of an electric power system2| station kThe method is a static unified stability criterion of the kth power electronic power station.
Step E: dynamic uniformity stability criterion USI for calculating sub-region of target power electronic power supply1；
Step F: judging whether the power electronic power supply subregion meets the dynamic uniformity stability criterion USI1Safety stability criteria of (1).
In step a, the actual power system shown in fig. 2 includes 3 power electronic power sub-areas and 18 power electronic power stations. The power electronic power supply sub-area a includes 7 power electronic power supply stations, the power electronic power supply sub-area B includes 8 power electronic power supply stations, and the power electronic power supply sub-area C includes 3 power electronic power supply stations.
The invention uses the power electronic power supply station W in the power electronic power supply sub-area A1For the research object, the equivalent electrical distance between the power electronic power station and the rest of the power systems is 0.007, and the maximum planned capacity of the power electronic power station obtained according to the formula (1) is 24.75 MW. If the actual construction capacity is larger than the maximum planning capacity, the static uniformity stability criterion USI of the power electronic power station2The stability standard cannot be met, and the disturbed power electronic power station has oscillation instability.
If the equivalent electrical distance between the power electronic power supply station and the rest of the power systems is changed, the maximum planned capacity of the power electronic power supply station is changed in inverse proportion to the equivalent electrical distance. Equivalent electrical distance between power electronic power supply station (area) and other power systems, and maximum planned capacity S of target power systemmax station kAs shown in table 1.
TABLE 1
Figure BDA0003078590790000101
With the continuous increase of the equivalent electrical distance, the electrical connection between the power electronic power supply station (area) and other power systems is continuously weakened, the risk of broadband oscillation of a high-proportion power electronic power system is continuously increased, and the maximum programming capacity S of the power electronic power supply station (area)max station kAre continuously decreasing.
In the step B, calculating the USI of the dynamic uniformity stability criterion of the power electronic power station1The calculation formula is as follows:
USI1| station k＝ρ(Geq -1(s)|ω＞0) (2)
Wherein G iseqThe equivalent open-loop transfer function of the power system can be obtained based on a linearized state equation of the power system; rho (·) is the spectral radius operation of the objective function, namely the spectral radius of the matrix is not larger than any induced norm of the matrix, and the calculation formula is as follows:
Figure BDA0003078590790000102
wherein λ isiIs the eigenvalue of the matrix.
In step C, the dynamic uniformity stability criterion USI of the power electronic power station1>And 1, the grid-connected power grid can stably run.
In the step D, the maximum planning capacity of the rest 6 power electronic power supply stations in the power electronic power supply sub-area A is calculated in sequence, and the USI is determined based on the dynamic uniformity stability1And checking the grid-connected stability of the power electronic power station. If the verification of a certain power electronic power supply station fails, the planning capacity is reduced until the dynamic uniformity stability criterion USI is met1Safety stability criteria of (1).
In step E, taking the bus of the power electronic power supply subregion A as a research pairCalculating the USI of the dynamic uniformity stability criterion of the power electronic power supply subsystem A when all power electronic power supply stations are connected to the grid1。
In step F, the USI is judged according to the dynamic uniformity stability1And checking the grid-connected stability of the power electronic power supply sub-area A. The calculation result shows that the dynamic uniformity stability criterion USI of the power electronic power subsystem A1>And 1, each power electronic power supply wind field determined according to the capacity planning method can stably run after being connected to the grid.
Fig. 5 is a structural diagram of an apparatus for grid-connected capacity planning of a power electronic power supply according to a preferred embodiment of the present invention. As shown in fig. 5, the present invention provides a device for planning grid-connected capacity of a power electronic power supply, comprising:
an initial unit 501, configured to determine a unified stability criterion USI of the power electronic power supply station, where the unified stability criterion USI of the power electronic power supply station includes a dynamic unified stability criterion USI1And static unified stability criterion USI2。
Preferably, the initial unit 501 is configured to determine a unified stability criterion USI of the power electronic power station, and includes:
obtaining an equivalent open-loop transfer function G of the power system based on a linearized state equation of the power systemeq(s)；
Equivalent open loop transfer function Geq(s) performing spectrum radius operation to obtain dynamic unified stability criterion USI1And static unified stability criterion USI2。
Preferably, the method further comprises the following steps: dynamic unified stability criterion USI for determining power electronic power supply station based on small gain theorem1Safety stability criteria of (1).
A computing unit 502 for basing the static unified stability criterion USI2Calculating maximum planned capacity S of power electronic power stationmax station k。
Preferably, the maximum planned capacity S of the power electronic power supply station is calculatedmax station kThe method comprises the following steps:
Figure BDA0003078590790000111
wherein L iss,kIs the equivalent electrical distance, U, between the kth power electronic power station and the power systemg,kIs the bus voltage, omega, of the kth power electronic supply station0Is power frequency, USI, of an electric power system2| station kThe method is a static unified stability criterion of the kth power electronic power station.
A result unit 503 for determining a dynamic unified stability criterion USI of the power electronic power station1Whether the dynamic safety stability standard is met or not, and when the dynamic unified stability criterion USI of the power electronic power supply station1When the dynamic safety stability standard is met, the maximum planned capacity S of the power electronic power station is setmax station kThe capacity plan is determined.
Preferably, the result unit 503 is further configured to: dynamic unified stability criterion USI of power electronic power station1If the dynamic safety stability standard is not met, the maximum planned capacity S of the power electronic power supply station is reducedmax station k。
Preferably, the result unit 503 is further configured to: and finishing the capacity planning of all power electronic power supply stations in the power electronic power supply area.
Preferably, the initial unit 501 is further configured to: dynamic unified stability criterion USI for determining power electronic power supply area1；
The result unit is further to: dynamic unified stability criterion USI for judging power electronic power supply area1Whether the dynamic safety stability standard is met or not, and when the dynamic uniform stability criterion USI of the power electronic power supply area1When the dynamic safety stability standard is met, the maximum planned capacity S of the power electronic power station is setmax station kThe capacity plan is determined.
The apparatus 500 for planning grid-connected capacity of an electric power electronic power supply in the preferred embodiment of the present invention corresponds to the method 100 for planning grid-connected capacity of an electric power electronic power supply in another preferred embodiment of the present invention, and will not be described herein again.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.

Claims (14)

1. A method of grid-connected capacity planning for a power electronic power supply, the method comprising:
determining a unified stability criterion USI of a power electronic power supply station, the unified stability criterion USI of the power electronic power supply station1Including dynamic unified stability criterion USI1And static unified stability criterion USI2；
Based on the static unified stability criterion USI2Calculating the maximum planned capacity S of the power electronic power stationmax station k；
When the dynamic unified stability criterion USI of the power electronic power station1If the dynamic safety stability standard is met, the maximum planned capacity S of the power electronic power station is setmax station kDeterminingFor capacity planning.
2. The method of claim 1, further comprising: when the dynamic unified stability criterion USI of the power electronic power station1If the dynamic safety stability standard is not met, the maximum planned capacity S of the power electronic power supply station is reducedmax station k。
3. The method of claim 1, further comprising: and finishing the capacity planning of all power electronic power supply stations in the power electronic power supply area.
4. The method according to claim 1, said determining a unified stability criterion USI of a power electronic power station comprising:
obtaining an equivalent open-loop transfer function G of the power system based on a linearized state equation of the power systemeq(s)；
For the equivalent open loop transfer function Geq(s) performing spectrum radius operation to obtain the dynamic unified stability criterion USI1And the static unified stability criterion USI2。
5. The method of claim 1, further comprising: determining the dynamic unified stability criterion USI of a power electronic power supply station based on the small gain theorem1Safety stability criteria of (1).
6. The method of claim 1, said calculating a maximum planned capacity S of said power electronic power supply stationmax station kThe method comprises the following steps:
Figure FDA0003078590780000021
wherein L iss,kIs the equivalent electrical distance, U, between the kth power electronic power station and the power systemg,kIs the bus voltage, omega, of the kth power electronic supply station0Is power frequency, USI, of an electric power system2| station kThe method is a static unified stability criterion of the kth power electronic power station.
7. The method of claim 1, further comprising:
dynamic unified stability criterion USI for determining power electronic power supply area1；
When the dynamic unified stability criterion USI of the power electronic power supply area1If the dynamic safety stability standard is met, the maximum planned capacity S of the power electronic power station is setmax station kThe capacity plan is determined.
8. An apparatus for grid-connected capacity planning of a power electronic power supply, the apparatus comprising:
an initial unit for determining a unified stability criterion USI of a power electronic power supply station, the unified stability criterion USI of the power electronic power supply station including a dynamic unified stability criterion USI1And static unified stability criterion USI2；
A computing unit for basing the static unified stability criterion USI2Calculating the maximum planned capacity S of the power electronic power stationmax station k；
A result unit for determining USI as dynamic unified stability criterion of the power electronic power station1If the dynamic safety stability standard is met, the maximum planned capacity S of the power electronic power station is setmax station kThe capacity plan is determined.
9. The apparatus of claim 8, the result unit further to: when the dynamic unified stability criterion USI of the power electronic power station1If the dynamic safety stability standard is not met, the maximum planned capacity S of the power electronic power supply station is reducedmax station k。
10. The apparatus of claim 8, the result unit further to: and finishing the capacity planning of all power electronic power supply stations in the power electronic power supply area.
11. The apparatus according to claim 8, the initialization unit being configured to determine a unified stability criterion USI for a power electronic power station, comprising:
obtaining an equivalent open-loop transfer function G of the power system based on a linearized state equation of the power systemeq(s)；
For the equivalent open loop transfer function Geq(s) performing spectrum radius operation to obtain the dynamic unified stability criterion USI1And the static unified stability criterion USI2。
12. The apparatus of claim 8, the initiating unit further to: determining the dynamic unified stability criterion USI of a power electronic power supply station based on the small gain theorem1Safety stability criteria of (1).
13. The apparatus of claim 8, the computing unit to compute a maximum planned capacity S of the power electronic power supply stationmax station kThe method comprises the following steps:
Figure FDA0003078590780000031
wherein L iss，kIs the equivalent electrical distance, U, between the kth power electronic power station and the power systemg，kIs the bus voltage, omega, of the kth power electronic supply station0Is power frequency, USI, of an electric power system2| station kThe method is a static unified stability criterion of the kth power electronic power station.
14. The apparatus of claim 8, the initiating unit further to: dynamic unified stability criterion USI for determining power electronic power supply area1；
The result unit is further to: when the power electronic power supply areaDynamic unified stability criterion USI1If the dynamic safety stability standard is met, the maximum planned capacity S of the power electronic power station is setmax station kThe capacity plan is determined.
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