CN113098069A - Method and device for planning grid-connected electrical distance of power electronic power supply - Google Patents
Method and device for planning grid-connected electrical distance of power electronic power supply Download PDFInfo
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Abstract
The invention discloses a method and a device for planning grid-connected electrical distance of a power electronic power supply, wherein the method comprises the following steps: static uniformity stability criterion USI for calculating power electronic power supply station2(ii) a Static uniformity stability criterion USI based on power electronic power supply station2Determining the maximum access electrical distance of a planning power electronic power supply station; calculating dynamic uniformity stability criterion USI of power electronic power supply station based on maximum access electrical distance of power electronic power supply station1(ii) a Dynamic uniformity stability criterion USI based on power electronic power supply station1Judging whether the power electronic power station is safe and stable; and when the judged power electronic power supply station is safe and stable, determining the maximum access electrical distance as the access electrical safety distance.
Description
Technical Field
The invention relates to the technical field of high-proportion power electronic power systems, in particular to a method and a device for planning grid-connected electrical distance of a power electronic power supply.
Background
With the increasing energy crisis, the renewable energy power generation industry represented by power electronic power generation is rapidly growing. The serious uneven spatial-temporal distribution of new energy power generation resources and load centers exists in China, high-quality new energy power generation resources are concentrated in western and northern areas, and important load centers are concentrated in eastern coastal areas. Therefore, developing and constructing high-voltage and large-capacity direct-current transmission projects becomes an important means for solving the resource dilemma in China.
Most of power electronic power supplies belong to asynchronous power supplies, and the power electronic power supplies can be connected to a large power grid after being controlled or modulated into fundamental frequency alternating current through a power converter. However, the dynamic characteristics of the asynchronous power supply are essentially different from those of the traditional power grid, and the power oscillation of the asynchronous power supply is easily caused by the unreasonable line parameter setting result, so that the problem of safety and stability of the whole power system is further solved.
The short-circuit ratio can be used for analyzing the safety and stability of the power system when the power electronic power system is connected to the alternating current power grid, and the indexes such as line equivalent parameters and accessible capacity are considered. However, the existing short-circuit ratio method can only represent the local system strength of the power electronic power supply grid-connected point, and does not consider the strong interaction between the asynchronous power supply and the synchronous power supply which may occur when the power electronic power supply station is connected to the electric distance change. Therefore, the maximum electrical distance of the power electronic power supply station obtained by the existing method is often larger, and the parameter setting of the power electronic power supply station based on the calculation result has serious safety and stability problems.
In recent years, the problem of safety and stability of a power system caused by a power electronic power supply is frequent, and the reasonable planning of the access electrical distance of the power electronic power supply is beneficial to avoiding the occurrence of safety and stability accidents. Research has shown that the safety and stability accidents can be alleviated or even eliminated by enhancing the electrical connection between the power electronic power supply station and other power systems, shortening the access electrical distance of the power electronic power supply station. However, in the prior art, a method for planning the access electrical distance of the power electronic power supply station (area) is rarely reported, and related work is mostly concentrated on a parameter setting and identifying method of a new energy power supply or a power electronic converter, so that the planning work of the access electrical distance in the actual engineering is seriously lack of theoretical basis, and a planning result has a greater safety and stability risk.
Therefore, a technique is needed to plan the grid-connected electrical distance of the power electronic power supply.
Disclosure of Invention
The technical scheme of the invention provides a method and a device for planning the grid-connected electrical distance of a power electronic power supply, which aim to solve the problem of planning the grid-connected electrical distance of the power electronic power supply.
In order to solve the above problem, the present invention provides a method for planning grid-connected electrical distance of a power electronic power supply, wherein the method comprises:
static uniformity stability criterion USI for calculating power electronic power supply station2；
Static uniformity stability criterion USI based on power electronic power supply station2Determining the maximum access electrical distance of a planning power electronic power supply station;
calculating dynamic uniformity stability criterion USI of power electronic power supply station based on maximum access electrical distance of power electronic power supply station1；
Dynamic uniformity stability criterion USI based on power electronic power supply station1And when the judged power electronic power supply station is safe and stable, determining the maximum access electrical distance as the access electrical safety distance.
Preferably, the method further comprises the following steps: and when the judged power electronic power supply station is unsafe and stable, reducing the maximum access electric distance of the power electronic power supply station.
Preferably, the method further comprises the following steps: and planning the distance of all power electronic power supply stations in the power electronic power supply area.
Preferably, the static uniformity stability criterion USI based on the power electronic power supply station2Determining a planned power electronic power supply fieldA maximum access electrical range of a station, comprising:
maximum access electrical distance (omega) of kth power electronic power station0Ls)max station kThe calculation formula is as follows:
wherein S isgFor the construction capacity, U, between the kth power electronic power station and the power systemgAnd k is the bus voltage of the kth power electronic power station.
Preferably, the dynamic uniformity stability criterion USI based on the power electronic power station1Judge whether the power electronics power supply station is safe and stable, include:
judging the USI of the dynamic uniformity stability criterion of the power electronic power station1Whether greater than 1;
when the dynamic uniformity stability criterion USI of the power electronic power station1And when the power supply voltage is greater than 1, the power electronic power supply station is safe and stable.
Preferably, the method further comprises the following steps:
dynamic unified stability criterion USI for determining power electronic power supply area1；
Judging dynamic unified stability criterion USI of the power electronic power supply area1Whether the power electronic power supply area is safe and stable or not, and when the power electronic power supply area is in a dynamic unified stability criterion USI1And when the safety is stable, determining the maximum access electric distance as the access electric safety distance.
Based on another aspect of the present invention, the present invention provides an apparatus for grid-connected electrical distance planning of a power electronic power supply, the apparatus comprising:
a first calculating unit for calculating the static uniformity stability criterion USI of the power electronic power station2；
A determination unit for determining a static unity stability criterion USI based on the power electronic power supply station2Determining a planned power electronics gridThe maximum access electrical distance of the source station;
a second calculation unit for calculating a dynamic uniformity stability criterion USI of the power electronic power supply station based on the maximum access electrical distance of the power electronic power supply station1；
A judgment unit for judging the USI based on the dynamic uniformity stability criterion of the power electronic power station1Judging whether the power electronic power station is safe and stable;
and the result unit is used for determining the maximum access electrical distance as the access electrical safety distance when the judged power electronic power supply station is safe and stable.
Preferably, the result unit is further configured to: and when the judged power electronic power supply station is unsafe and stable, reducing the maximum access electric distance of the power electronic power supply station.
Preferably, the result unit is further configured to: and planning the distance of all power electronic power supply stations in the power electronic power supply area.
Preferably, the determination unit is configured to determine a static uniformity stability criterion USI based on the power electronic power supply station2Determining a maximum access electrical distance of a planned power electronic power supply station, comprising:
maximum access electrical distance (omega) of kth power electronic power station0Ls)max station kThe calculation formula is as follows:
wherein S isgFor the construction capacity, U, between the kth power electronic power station and the power systemg，kIs the bus voltage of the kth power electronic power station.
Preferably, the determining unit is specifically configured to: judging the USI of the dynamic uniformity stability criterion of the power electronic power station1Whether greater than 1;
dynamic unification of the power electronic power supply stationsCriterion of sexual stability USI1And when the power supply voltage is greater than 1, the power electronic power supply station is safe and stable.
Preferably, the first and second electrodes are formed of a metal,
the determining unit is also used for determining a dynamic unified stability criterion USI of the power electronic power supply area1；
The judgment unit is also used for judging the dynamic unified stability criterion USI of the power electronic power supply area1Whether the power electronic power supply area is safe and stable or not, and when the power electronic power supply area is in a dynamic unified stability criterion USI1And when the safety is stable, determining the maximum access electric distance as the access electric safety distance.
The invention provides a method and a device for planning grid-connected electric distance of a power electronic power supply, wherein the method comprises the following steps: static uniformity stability criterion USI for calculating power electronic power supply station2(ii) a Static unification stability criterion USI based on power electronic power supply station2Determining the maximum access electrical distance of a planning power electronic power supply station; calculating dynamic uniformity stability criterion USI of power electronic power supply station based on maximum access electrical distance of power electronic power supply station1(ii) a Dynamic uniformity stability criterion USI based on power electronic power station1Judging whether the power electronic power station is safe and stable; and when the judged power electronic power station is safe and stable, determining the maximum access electrical distance as the access electrical safety distance. The method for planning the access electric distance of the power electronic power supply station (area) provided by the technical scheme of the invention considers the dynamic process of the power electronic power supply station, combines the access electric distance planning with the stability judgment of the power system, and eliminates the instability risk of the power system caused by neglecting the strong interaction between the power supplies. The planning method for the electric power electronic power supply station (area) access electric distance provided by the technical scheme of the invention has the advantages of simple calculation process and high accuracy, and meets the application requirements of an engineering field.
Drawings
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 grid-connected electrical distance planning of a power electronic power supply according to a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of a real power system model according to a preferred embodiment of the present invention;
FIG. 3 is a flow chart of a method for grid-connected electrical distance 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) -infinity system model in accordance with a preferred embodiment of the present invention; and
fig. 5 is a device structure for grid-connected electrical distance planning of a power electronic power supply according to a preferred embodiment of the 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 flowchart of a method for grid-connected electrical distance planning of a power electronic power supply according to a preferred embodiment of the present invention. In order to improve the safety and stability of the power electronic power supply station and the area, the invention provides a power electronic power supply station (area) access electrical distance planning method based on a uniformity stability criterion.
As shown in fig. 1, the present invention provides a method for planning grid-connected electrical distance of a power electronic power supply, the method comprising:
step 101: static uniformity stability criterion USI for calculating power electronic power supply station2；
Step 102: static unification stability criterion USI based on power electronic power supply station2Determining the maximum access electrical distance of a planning power electronic power supply station;
the invention first establishes or identifies a linearized state equation of a high-proportion power electronic power system. Establishing a linearized state equation of the power system by identifying parameters of a power electronic power supply station in the power system, and further obtaining a transfer function matrix G of other power systems in an open-loop operation state of the power electronic power supplys(s) and a transfer function matrix G for a power electronic power supplyg(s)。
Step 102: static uniformity stability criterion USI for determining power electronic power supply station2And based on the static uniformity stability criterion USI2Planning the maximum access electrical distance (omega) of a power electronic power station0Ls)max station k；
Preferably, the static uniformity stability criterion USI is set in a power electronic power station2Determining a maximum access electrical distance of a planned power electronic power supply station, comprising:
maximum access electrical distance (omega) of kth power electronic power station0Ls)max station kThe calculation formula is as follows:
wherein S isgFor the construction capacity, U, between the kth power electronic power station and the power systemg,kIs the bus voltage of the kth power electronic power station.
In step 102, the power electronic power station with the determined capacity to be established is subjected to static uniformity stability criterion USI2And calculating the maximum access electrical distance of the power transmission and transformation equipment, and realizing parameter matching by adjusting parameters of the power transmission and transformation equipment. The kth power supplyMaximum access electrical distance (omega) of sub-power supply station0Ls)max station kCan be calculated according to the following formula:
wherein S isgFor the construction capacity, 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: calculating dynamic uniformity stability criterion USI of power electronic power supply station based on maximum access electrical distance of power electronic power supply station1；
Step 103: dynamic uniformity stability criterion USI for calculating power electronic power station1And based on the USI1And evaluating the safety and stability of the power electronic power station.
Step 104: dynamic uniformity stability criterion USI based on power electronic power station1Judging whether the power electronic power station is safe and stable;
in step 104, calculating a dynamic uniformity stability criterion USI of the power electronic power station1And judging the safety and stability of the power electronic power station based on the small gain theorem. If not, the electric access distance of the power electronic power supply station is reduced, and the electric connection between the power electronic power supply station and other power systems is enhanced.
Preferably, dynamic uniformity stability criterion USI based on power electronic power station1Judge whether safety and stability in power electronics power supply station includes:
dynamic uniformity stability criterion USI for judging power electronic power supply station1Whether greater than 1;
dynamic uniformity stability criterion USI of power electronic power station1When the power supply voltage is larger than 1, the power electronic power supply station is safe and stable.
Step 105: and when the judged power electronic power station is safe and stable, determining the maximum access electrical distance as the access electrical safety distance.
Preferably, the method further comprises the following steps: and when the judged power electronic power supply station is unsafe and stable, reducing the maximum access electric distance of the power electronic power supply station.
Preferably, the method further comprises the following steps: and planning the distance of all power electronic power supply stations in the power electronic power supply area.
The invention repeatedly carries out the distance planning method of the power electronic power supply station until the maximum access electric distance (omega) of all the power electronic power supply stations in the power electronic power supply area is finished0Ls)max station kAnd (6) planning.
Preferably, the method further comprises the following steps:
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 power supply is safe and stable or not, and when the power supply is in a power electronic power supply area, a dynamic unified stability criterion USI1And when the safety is stable, determining the maximum access electric distance as the access electric safety distance.
The invention calculates the dynamic unification stability criterion USI of the power electronic power supply area1And based on the USI1And evaluating the safety stability of the power electronic power supply area. The invention integrates all power electronic power supply stations in a power electronic power supply area into a system section, and calculates the dynamic uniformity stability criterion USI of the area1。
And if the result does not meet the safety stability standard, replanning the maximum access electric distance of the power electronic power supply station until all the power electronic power supply stations and the power electronic power supply area meet the safety stability standard.
Criterion USI for stability of dynamic uniformity of power electronic power supply area1If the evaluation standard is not met, returning to the step 2, and replanning the maximum access electrical distance of each power electronic power supply station until the dynamic uniformity stability criterion USI is met1And (6) evaluating the standard.
The invention provides a method for planning the access electrical distance of a power electronic power supply station (area) based on a unified stability criterion, which has strict theoretical support and definite physical significance; the method for planning the access electric distance of the power electronic power supply station (area) considers the dynamic process of the power electronic power supply station, combines the access electric distance planning with the stability judgment of the power system, and eliminates the instability risk of the power system caused by neglecting the strong interaction between power supplies; the planning method for the access distance of the power electronic power 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.
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
The present invention will be described in further detail by taking the actual power system as 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: calculating the maximum planning distance of the power electronic power supply station based on a static uniformity stability criterion;
and B: dynamic uniformity stability criterion USI for calculating power electronic power station1And based on the USI1Evaluating the safety and stability of the power electronic power station;
and C: calculating the maximum electric distance of all power electronic power supply stations in the target power electronic power supply area, and based on the USI1Sequentially checking the safety and stability of each power electronic power supply station;
step D: integrating the power electronic power supply area into a power electronic power supply section, and calculating the dynamic uniformity stability criterion USI of the power electronic power supply section1And based on the USI1And (5) verifying the safety and stability of the section of the power electronic power supply.
In step a, the actual power system shown in fig. 2 includes 3 power electronic power supply regions and 18 power electronic power supply stations. The power electronic power supply area a includes 7 power electronic power supply stations, the power electronic power supply area B includes 8 power electronic power supply stations, and the power electronic power supply area C includes 3 power electronic power supply stations.
The invention uses the power electronic power station W in the power electronic power area A1For research objects, in order to ensure the safety and stability of a target power electronic power station, the static uniformity stability criterion of the power electronic power station is generally set as USI2＝3。
For the power electronic power station with determined capacity to be built, the static uniformity stability criterion USI is used2And calculating the maximum access electrical distance of the power transmission and transformation equipment, and realizing parameter matching by adjusting parameters of the power transmission and transformation equipment. Maximum access electrical distance (omega) of kth power electronic power station0Ls)max station kCan be calculated according to the following formula:
wherein S isgFor the construction capacity, U, between the kth power electronic power station and the power systemg，kIs the bus voltage of the kth power electronic power station.
If the proposed capacity of the power electronic power station is determined to be 49.50MW, the maximum electrical distance of the power electronic power station is 0.0022 according to the formula (1).
If the actual electrical distance is greater than the maximum electrical distance, the electrical connection between the power electronic power supply station and the rest of the power systems is too weak, so that the problem of safety and stability of the power systems caused by power electronic equipment is easily caused, and the protection action is cut off.
If the proposed capacity of the power electronic power station is changed, the maximum electrical distance of the power electronic power station is changed accordingly. Generally, the proposed installation capacity of the power electronic power station is increased, and the electrical connection strength between the power electronic power station and other power systems should be further enhanced, so as to reduce the maximum electrical distance of the power electronic power station. The relationship between the proposed capacity of the power electronic power station (area) and the maximum access electrical distance between the target power electronic power station (area) and the rest of the power system is shown in table 1.
TABLE 1
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:
wherein λ isiIs the eigenvalue of the matrix.
Dynamic uniformity stability criterion USI of power electronic power station1>And 1, the grid-connected power grid can stably run.
And step C, sequentially calculating the maximum access electrical distance of the rest 6 power electronic power supply stations in the power electronic power supply area A, and checking the grid-connected stability of the power electronic power supply stations based on the dynamic short-circuit ratio. If the verification of a certain power electronic power supply station is not passed, the equipment and line parameters of the power electronic power supply station are re-set, and the electrical distance is reduced until the verification standard of the dynamic short-circuit ratio is met.
In the step D, calculating the dynamic uniformity stability criterion USI of the power electronic power supply area A when all power electronic power supply stations are connected to the grid by taking the bus of the power electronic power supply area A as a research object1。
Stability according to dynamic uniformityCriterion USI1And verifying the grid-connected stability of the power electronic power supply area A. The calculation result shows that the dynamic uniformity stability criterion USI of the power electronic power supply area A1>1, planning the maximum access electric distance of each power electronic power supply station according to the method of the invention, and stably operating after grid connection.
Fig. 5 is a device structure for grid-connected electrical distance planning of a power electronic power supply according to a preferred embodiment of the invention. As shown in fig. 5, the present invention provides a device for grid-connected electrical distance planning of a power electronic power supply, comprising:
a first calculating unit 501, configured to calculate a static uniformity stability criterion USI of the power electronic power station2；
A determination unit 502 for determining a USI based on the static uniformity stability criterion of the power electronic power station2Determining the maximum access electrical distance of a planning power electronic power supply station;
a second calculating unit 503, configured to calculate a dynamic uniformity stability criterion USI of the power electronic power supply station based on a maximum access electrical distance of the power electronic power supply station1；
A judgment unit 504 for determining the USI based on the dynamic uniformity stability criteria of the power electronic power station1Judging whether the power electronic power station is safe and stable;
and a result unit 505, configured to determine the maximum access electrical distance as the access electrical safety distance when the determined power electronic power supply station is safe and stable.
Preferably, the result unit 505 is further configured to: and when the judged power electronic power supply station is unsafe and stable, reducing the maximum access electric distance of the power electronic power supply station.
Preferably, the apparatus is further configured to: and planning the distance of all power electronic power supply stations in the power electronic power supply area.
Preferably, the determination unit 502 is configured to determine the static uniformity stability criterion USI based on the power electronic power station2Determining a maximum access electrical distance of a planned power electronic power supply station, comprising:
maximum access electrical distance (omega) of kth power electronic power station0Ls)max station kThe calculation formula is as follows:
wherein S isgFor the construction capacity, U, between the kth power electronic power station and the power systemg,kIs the bus voltage of the kth power electronic power station.
Preferably, the judging unit 504 is configured to determine the USI based on the dynamic uniformity stability criterion of the power electronic power station1Judge whether safety and stability in power electronics power supply station includes:
dynamic uniformity stability criterion USI for judging power electronic power supply station1Whether greater than 1;
dynamic uniformity stability criterion USI of power electronic power station1When the power supply voltage is larger than 1, the power electronic power supply station is safe and stable.
Preferably, the determination unit is further configured to determine a dynamic unified stability criterion USI of the power electronic supply area1；
The judgment unit is also used for judging the dynamic unified stability criterion USI of the power electronic power supply area1Whether the power supply is safe and stable or not, and when the power supply is in a power electronic power supply area, a dynamic unified stability criterion USI1And when the safety is stable, determining the maximum access electric distance as the access electric safety distance.
The system 500 for grid-connected electrical distance planning of a power electronic power supply according to the preferred embodiment of the present invention corresponds to the method 100 for grid-connected electrical distance planning of a power electronic power supply according to the preferred embodiment of the present invention, and is not 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 (12)
1. A method of grid-connected electrical distance planning for a power electronic power supply, the method comprising:
static uniformity stability criterion USI for calculating power electronic power supply station2；
Static uniformity stability criterion USI based on power electronic power supply station2Determining the maximum access electrical distance of a planning power electronic power supply station;
calculating dynamic uniformity stability criterion USI of power electronic power supply station based on maximum access electrical distance of power electronic power supply station1；
Dynamic uniformity stability criterion USI based on power electronic power supply station1And when the judged power electronic power supply station is safe and stable, determining the maximum access electrical distance as the access electrical safety distance.
2. The method of claim 1, further comprising: and when the judged power electronic power supply station is unsafe and stable, reducing the maximum access electric distance of the power electronic power supply station.
3. The method of claim 1, further comprising: and planning the distance of all power electronic power supply stations in the power electronic power supply area.
4. The method according to claim 1, wherein the static unity stability criterion USI based on the power electronic power supply station2Determining a maximum access electrical distance of a planned power electronic power supply station, comprising:
maximum access electrical distance (omega) of kth power electronic power station0Ls)max station kThe calculation formula is as follows:
wherein S isgFor the construction capacity, U, between the kth power electronic power station and the power systemg，kIs the bus voltage of the kth power electronic power station.
5. The method according to claim 1, wherein the dynamic uniformity stability criterion USI based on the power electronic power supply station1Judge whether the power electronics power supply station is safe and stable, include:
judging the USI of the dynamic uniformity stability criterion of the power electronic power station1Whether greater than 1;
when the dynamic uniformity stability criterion USI of the power electronic power station1And when the power supply voltage is greater than 1, the power electronic power supply station is safe and stable.
6. The method of claim 1, further comprising:
dynamic unified stability criterion USI for determining power electronic power supply area1；
Judging dynamic unified stability criterion USI of the power electronic power supply area1Whether or not toFor safety and stability, as the dynamic unified stability criterion USI of the power electronic power supply area1And when the safety is stable, determining the maximum access electric distance as the access electric safety distance.
7. An apparatus for grid-tied electrical distance planning of a power electronic power supply, the apparatus comprising:
a first calculating unit for calculating the static uniformity stability criterion USI of the power electronic power station2；
A determination unit for determining a static unity stability criterion USI based on the power electronic power supply station2Determining the maximum access electrical distance of a planning power electronic power supply station;
a second calculation unit for calculating a dynamic uniformity stability criterion USI of the power electronic power supply station based on the maximum access electrical distance of the power electronic power supply station1；
A judgment unit for judging the USI based on the dynamic uniformity stability criterion of the power electronic power station1Judging whether the power electronic power station is safe and stable;
and the result unit is used for determining the maximum access electrical distance as the access electrical safety distance when the judged power electronic power supply station is safe and stable.
8. The apparatus of claim 7, the result unit further to: and when the judged power electronic power supply station is unsafe and stable, reducing the maximum access electric distance of the power electronic power supply station.
9. The apparatus of claim 7, the result unit further to: and planning the distance of all power electronic power supply stations in the power electronic power supply area.
10. The apparatus according to claim 7, said determining unit being adapted to base a static unity stability criterion USI of said power electronic power supply station2Determining projected powerThe maximum access electrical distance of the electronic power station comprises:
maximum access electrical distance (omega) of kth power electronic power station0Ls)max station kThe calculation formula is as follows:
wherein S isgFor the construction capacity, U, between the kth power electronic power station and the power systemg，kIs the bus voltage of the kth power electronic power station.
11. The apparatus according to claim 7, wherein the determining unit is specifically configured to: judging the USI of the dynamic uniformity stability criterion of the power electronic power station1Whether greater than 1;
when the dynamic uniformity stability criterion USI of the power electronic power station1And when the power supply voltage is greater than 1, the power electronic power supply station is safe and stable.
12. The apparatus of claim 7, wherein the first and second electrodes are disposed on opposite sides of the substrate,
the determining unit is also used for determining a dynamic unified stability criterion USI of the power electronic power supply area1；
The judgment unit is also used for judging the dynamic unified stability criterion USI of the power electronic power supply area1Whether the power electronic power supply area is safe and stable or not, and when the power electronic power supply area is in a dynamic unified stability criterion USI1And when the safety is stable, determining the maximum access electric distance as the access electric safety distance.
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