CN115940173B - Method and device for determining static voltage stability of new energy multi-station delivery system - Google Patents
Method and device for determining static voltage stability of new energy multi-station delivery system Download PDFInfo
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Abstract
The invention discloses a method and a device for determining static voltage stability of an energy multi-station sending-out system. The method comprises the following steps: in a new energy multi-station sending system, under the condition that the disturbance power of a certain station is greatly increased, determining that the station is a disturbance station, and determining the power growth coefficients of other stations in the new energy multi-station sending system according to wind power prediction; determining the power steady-state limit of the disturbance station according to the short-circuit capacity and impedance of each unit of the disturbance station and the power growth coefficient of the rest station; determining the static voltage stability limit power of a new energy multi-station delivery system according to the power stability limit of the disturbance station and the delivery power of the rest stations; and determining the margin ratio index of the new energy multi-station delivery system according to the static voltage stability limit power and the initial running power of the new energy multi-station delivery system, and determining the static voltage stability of the new energy multi-station delivery system according to the margin ratio index.
Description
Technical Field
The invention relates to the technical field of stability analysis of power systems, in particular to a method and a device for determining static voltage stability of a new energy multi-station sending-out system.
Background
The new energy has the characteristics of low carbon, environmental protection, sustainable development and the like, so that the power generation capacity of renewable energy sources in China steadily increases in recent years, and the new energy source duty ratio in an electric power system is gradually increased, which marks that the new energy source power generation will become the main force of future electric power supply in China. Therefore, the static voltage stability of the new energy multi-station delivery system is researched, and the static voltage stability margin of the delivery system is evaluated to be of great significance.
The short circuit ratio is widely applied to the evaluation of the voltage supporting capability of the system to the access equipment, is firstly applied to the static voltage stability evaluation of the direct current access alternating current system, is derived based on a single-point static voltage stability analysis formula and can effectively evaluate the static voltage stability. However, the multi-feed short-circuit ratio applied to the new energy multi-station sending system at present is based on the expansion of a single-feed short-circuit ratio form, has no strict equivalent relation with static voltage stability, and cannot give consideration to both visual manifestation of influence factors on the stability of the new energy sending static voltage and strict geographic derivation of the critical short-circuit ratio. Meanwhile, for the problem of static voltage stabilization of multi-point power transmission, the current short-circuit ratio index does not consider the influence of different growth modes of system power on the static voltage stabilization.
The prior art scheme is to equivalently aggregate other new energy stations to the station to be researched, so that the new energy multi-station sending system can be equivalently used as a single-point sending system, and at the moment, according to the definition of the single-feed short-circuit ratio, the short-circuit ratio index in the new energy multi-station system can be obtained. There are two disadvantages: first, the critical value threshold lacks a strict theoretical derivation. Second, when the power of the station under study is greatly increased, the different ways of increasing the power of the rest stations correspond to different settling limits, and the influence of the different ways of increasing the power of the system on the settling voltage is not considered in the prior art.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method and a device for determining the static voltage stability of a new energy multi-station sending system.
According to one aspect of the present invention, there is provided a method for determining static voltage stability of a new energy multi-station delivery system, comprising:
in the new energy multi-station sending system, under the condition that the disturbance power of a certain station is greatly increased, determining that the station is a disturbance station, and determining the power growth coefficients of other stations in the new energy multi-station sending system according to wind power prediction, wherein the other stations are far away from the disturbance station, the output correlation is lower, and the power change is smaller than that of the disturbance station;
determining the power steady-state limit of the disturbance station according to the short-circuit capacity and impedance of each unit of the disturbance station and the power growth coefficient of the rest station;
determining the static voltage stability limit power of a new energy multi-station delivery system according to the power stability limit of the disturbance station and the delivery power of the rest stations;
and determining the margin ratio index of the new energy multi-station delivery system according to the static voltage stability limit power and the initial running power of the new energy multi-station delivery system, and determining the static voltage stability of the new energy multi-station delivery system according to the margin ratio index.
Optionally, determining the operation of the power steady state limit of the perturbed station based on the short circuit capacity, impedance, and power growth coefficients of the remaining stations for each unit in the perturbed station comprises:
respectively determining a unit power steady-state extremum of each unit of the disturbance station according to the short-circuit capacity, the impedance and the power growth coefficient of the rest station of each unit in the disturbance station;
and superposing the unit power steady-state extremum of each unit of the disturbance station to determine the power steady-state extremum of the disturbance station.
Optionally, according to the short-circuit capacity, impedance and power growth coefficient of each unit in the disturbance station and the rest station, the calculation formula of the unit power steady-state extremum of the unit i in the disturbance station is respectively determined as follows:
wherein S is ac,li Is the short-circuit capacity of the new energy unit i studied in the perturbation station l, xeql, ii is the self-impedance of the unit i in the perturbation station l, X eql,ij Is the mutual impedance of the unit i in the disturbance station l and other units in the station, X eqlk Is the transimpedance of the perturbing station l with the other stations k, j=1, 2 "..., n, n is the number of new energy units in the disturbance station, k=1, 2, …, m, m is the number of all stations in the new energy multi-station delivery system, P k ＝K k P k0 ，P k0 Is the initial power of station K k Is the power growth factor of station k.
Optionally, the operation of determining the static voltage stability of the new energy multi-station delivery system according to the margin ratio index includes:
under the condition that the margin ratio index is larger than or equal to a preset threshold value, judging that the static voltage of the new energy multi-station sending-out system is stable;
and under the condition that the margin ratio index is smaller than a preset threshold value, judging that the static voltage of the new energy multi-station sending-out system is unstable.
According to another aspect of the present invention, there is provided a static voltage stabilization determining apparatus of a new energy multi-station delivery system, comprising:
the first determining module is used for determining that a station is a disturbance station under the condition that disturbance power of a certain station is greatly increased in the new energy multi-station sending system, and determining power growth coefficients of other stations in the new energy multi-station sending system according to wind power prediction, wherein the other stations are far away from the disturbance station, have lower output correlation and have less power change than the disturbance station;
the second determining module is used for determining the power steady-state limit of the disturbance station according to the short-circuit capacity and impedance of each unit of the disturbance station and the power growth coefficient of the rest station;
the third determining module is used for determining the static voltage stability limit power of the new energy multi-station sending system according to the power stability limit of the disturbance station and the sending power of the rest station;
and the fourth determining module is used for determining the margin ratio index of the new energy multi-station sending system according to the static voltage stability limit power and the initial running power of the new energy multi-station sending system and determining the static voltage stability of the new energy multi-station sending system according to the margin ratio index.
According to a further aspect of the present invention there is provided a computer readable storage medium storing a computer program for performing the method according to any one of the above aspects of the present invention.
According to still another aspect of the present invention, there is provided an electronic device including: a processor; a memory for storing the processor-executable instructions; the processor is configured to read the executable instructions from the memory and execute the instructions to implement the method according to any of the above aspects of the present invention.
The invention provides a method for determining the static voltage stability of a new energy multi-station sending system, which comprises the steps of calculating the static voltage stability limit power of the new energy multi-station sending system, obtaining the margin ratio index of the new energy multi-station according to the stability limit, and further evaluating the static voltage stability of the system.
Drawings
Exemplary embodiments of the present invention may be more completely understood in consideration of the following drawings:
FIG. 1 is a flow chart of a method for determining static voltage stability of a new energy multi-station delivery system according to an exemplary embodiment of the present invention;
FIG. 2 is a schematic diagram of a new energy two-station delivery system according to an exemplary embodiment of the present invention;
FIG. 3 is a schematic diagram of the equivalent circuit of FIG. 2 after disassembly;
FIG. 4 is a schematic diagram of an exemplary structure of a new energy multi-station delivery according to an exemplary embodiment of the present invention;
fig. 5 is a schematic structural diagram of a static voltage stability determining device of a new energy multi-station delivery system according to an exemplary embodiment of the present invention;
fig. 6 is a structure of an electronic device provided in an exemplary embodiment of the present invention.
Detailed Description
Hereinafter, exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. It should be apparent that the described embodiments are only some embodiments of the present invention and not all embodiments of the present invention, and it should be understood that the present invention is not limited by the example embodiments described herein.
It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.
It will be appreciated by those of skill in the art that the terms "first," "second," etc. in embodiments of the present invention are used merely to distinguish between different steps, devices or modules, etc., and do not represent any particular technical meaning nor necessarily logical order between them.
It should also be understood that in embodiments of the present invention, "plurality" may refer to two or more, and "at least one" may refer to one, two or more.
It should also be appreciated that any component, data, or structure referred to in an embodiment of the invention may be generally understood as one or more without explicit limitation or the contrary in the context.
In addition, the term "and/or" in the present invention is merely an association relationship describing the association object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In the present invention, the character "/" generally indicates that the front and rear related objects are an or relationship.
It should also be understood that the description of the embodiments of the present invention emphasizes the differences between the embodiments, and that the same or similar features may be referred to each other, and for brevity, will not be described in detail.
Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description.
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods, and apparatus should be considered part of the specification.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
Embodiments of the invention are operational with numerous other general purpose or special purpose computing system environments or configurations with electronic devices, such as terminal devices, computer systems, servers, etc. Examples of well known terminal devices, computing systems, environments, and/or configurations that may be suitable for use with the terminal device, computer system, server, or other electronic device include, but are not limited to: personal computer systems, server computer systems, thin clients, thick clients, hand-held or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network personal computers, small computer systems, mainframe computer systems, and distributed cloud computing technology environments that include any of the foregoing, and the like.
Electronic devices such as terminal devices, computer systems, servers, etc. may be described in the general context of computer system-executable instructions, such as program modules, being executed by a computer system. Generally, program modules may include routines, programs, objects, components, logic, data structures, etc., that perform particular tasks or implement particular abstract data types. The computer system/server may be implemented in a distributed cloud computing environment in which tasks are performed by remote processing devices that are linked through a communications network. In a distributed cloud computing environment, program modules may be located in both local and remote computing system storage media including memory storage devices.
Exemplary method
Fig. 1 is a flow chart of a method for determining static voltage stability of a new energy multi-station delivery system according to an exemplary embodiment of the present invention. The method 100 for determining the static voltage stability of the new energy multi-station delivery system according to the present embodiment may be applied to an electronic device, as shown in fig. 1, and includes the following steps:
step 101, in a new energy multi-station sending system, under the condition that the disturbance power of a certain station is greatly increased, determining that the station is a disturbance station, and determining the power growth coefficients of other stations in the new energy multi-station sending system according to wind power prediction, wherein the other stations are far away from the disturbance station, the output correlation is lower, and the power change is smaller than that of the disturbance station;
102, determining a power steady-state limit of a disturbance station according to the short-circuit capacity and impedance of each unit of the disturbance station and the power growth coefficient of the rest station;
step 103, determining the static voltage stability limit power of the new energy multi-station delivery system according to the power stability limit of the disturbance stations and the delivery power of the rest stations;
step 104, determining a margin ratio index of the new energy multi-station delivery system according to the static voltage stability limit power and the initial running power of the new energy multi-station delivery system, and determining the static voltage stability of the new energy multi-station delivery system according to the margin ratio index.
Optionally, determining the operation of the power steady state limit of the perturbed station based on the short circuit capacity, impedance, and power growth coefficients of the remaining stations for each unit in the perturbed station comprises:
respectively determining a unit power steady-state extremum of each unit of the disturbance station according to the short-circuit capacity, the impedance and the power growth coefficient of the rest station of each unit in the disturbance station;
and superposing the unit power steady-state extremum of each unit of the disturbance station to determine the power steady-state extremum of the disturbance station.
Optionally, according to the short-circuit capacity, impedance and power growth coefficient of each unit in the disturbance station and the rest station, the calculation formula of the unit power steady-state extremum of the unit i in the disturbance station is respectively determined as follows:
wherein S is ac,li Is the short-circuit capacity of the new energy unit i studied in the perturbation station l, xeql, ii is the self-impedance of the unit i in the perturbation station l, X eql,ij Is the mutual impedance of the unit i in the disturbance station l and other units in the station, X eqlk Is the transimpedance of the perturbed station l with respect to the other stations k, j=1, 2..n, n is the number of new energy units in the perturbed station, k=1, 2, …, m, m is the number of all stations in the new energy multi-station delivery system, P k ＝K k P k0 ，P k0 Is the initial power of station K k Is the power growth factor of station k.
Optionally, the operation of determining the static voltage stability of the new energy multi-station delivery system according to the margin ratio index includes:
under the condition that the margin ratio index is larger than or equal to a preset threshold value, judging that the static voltage of the new energy multi-station sending-out system is stable;
and under the condition that the margin ratio index is smaller than a preset threshold value, judging that the static voltage of the new energy multi-station sending-out system is unstable.
Specifically, the static voltage stability analysis margin ratio index of the new energy multi-point sending system provided by the invention has a definite critical value, namely, the preset threshold value is 1, so that the static voltage stability condition of the power grid in practical engineering application can be well judged. Meanwhile, the index can intuitively show the influence of short-circuit capacity, electric distance and power emitted by other new energy sources on the new energy sources to be researched, accords with a power increasing mode in practical engineering application, solves the problem that the existing short-circuit ratio calculation method cannot take both aspects into consideration, and has wider application scenes.
Specifically, when the power of the station under study is greatly increased, different increasing modes of the power of other stations correspond to different stability limits, and margin ratio indexes are deduced from the static stability limits of single points and finally expanded to a multi-point sending-out system, so that the influence of the electric distance and the power emitted by other new energy sources on the new energy unit under study can be intuitively reflected, and the stability limits of the system under different power increasing modes can be better reflected.
The invention discloses a determination method for evaluating the margin ratio index of the static voltage stability of a new energy multi-station system.
Step 1, calculating the static voltage stability limit power of a new energy multi-station sending system
For the new energy two-station delivery system as in FIG. 2, X in FIG. 2 3 Detachable as X in FIG. 3 31 And X is 32 . To ensure equivalence of the system before and after splitting, namely X 3 The voltage at two ends is unchanged, and the reactance splitting should meet the following two conditions:
(1) Decoupled X 31 And X is 32 The power flowing upward should conform to the power transmission expression (1).
Wherein: p is the power of line transmission; u (U) 0 、U 3 The voltages at two ends of the line are respectively; x is equivalent reactance between two ends of the line; delta is the difference of the work angles of the two ends.
(2)X 31 And X is 32 After parallel connection, X is equal to X before splitting 3 . Such a power coupled line may be decoupled into lines from which each station power is delivered separately.
In practical engineering application, most of the new energy units are subjected to disturbance power change, and the power change of the new energy units with longer distance and lower output correlation is smaller than that of the disturbed units. Based on this, let P 1 Growth, P 2 Is KP 20 Where K is the station 2 power growth factor. In this growing mode, the steady-state limit P of the station 1 is according to equation (1) and fig. 3 1max The expression is shown as formula (2), X 31 Formula (3) can be written.
Wherein X is 31 To split the reactance of the single-pass flow of the station 1, P 1max For the stationarity limit of station 1, P 20 Is the initial power of station 2.
Reactance X of single-path flow of split station 1 obtained by solving formula (3) 31 Substituting into (2) to obtain P 1max The expression of (2) is as follows:
self-impedance X of circuit eq11 ＝X 3 Transimpedance X eq12 ＝X 1 +X 3 Short-circuit capacity S of station 1 ac1 ＝1/X eq11 Substituted into the above P 1max Will P 1max Rewritten as the following expression:
the two-station sending-out system is further expanded to obtain a new energy multi-station sending-out typical system shown in fig. 4, and the static stability limit expression of each unit in a station l in the multi-station system can be obtained by adopting the reactance splitting method in the two-station system as shown in a formula (6). Because the model numbers of the units in each station are the same, the power steady-state limit of the station l is the sum of the static steady-state limits of the units, namely P lmax ＝jP imax 。
Wherein S is ac,li Is in the disturbance station lThe short-circuit capacity of the new energy plant i studied, xeql, ii is the self-impedance of the plant i in the perturbation station l, X eql,ij Is the mutual impedance of the unit i in the disturbance station l and other units in the station, X eqlk Is the transimpedance of the perturbed station l with respect to the other stations k, j=1, 2..n, n is the number of new energy units in the perturbed station, k=1, 2, …, m, m is the number of all stations in the new energy multi-station delivery system, P k ＝K k P k0 ，P k0 Is the initial power of station K k Is the power growth factor of station k.
As can be seen from the above, the static voltage stability limit power of the station under study in the system can be obtained by measuring the short-circuit capacity, impedance and power of the rest stations in the system, and then by P max ＝jP imax +P 2 +P 3 ···+P k The static voltage of the whole system can be stabilized to the limit power.
Step 2, evaluating the static voltage stability of the system according to the margin ratio index of the new energy multi-station
In an electrical power system, when the system is critically stable, the power of the load is the maximum power that the system can transmit, and for a multi-node outgoing (or incoming) system, during the power increase of multiple nodes, it is generally considered that: when a certain node reaches the stability limit of the point first, the stability limit of the whole sending (or receiving) system is determined, and the stability limit of the system can be measured by the node which reaches the stability limit of the point first. Therefore, the static voltage stability margin ratio index of the new energy unit to be researched is defined as the limit power P max With initial operating power P 0 Ratio of (i.e. P) max /P 0 The combined type (6) is used for obtaining the expression of the margin ratio index for evaluating the stability of the static voltage of the new energy multi-station delivery system, wherein the expression is as follows:
wherein: p (P) 0 The initial power of a unit to be researched in the new energy multi-station system is obtained. P (P) j The influence of different growth modes of the power of other new energy stations on the unit to be researched is reflected. The current margin ratio index can be obtained by measuring the new energy power, the self impedance, the transimpedance and the short-circuit capacity in real time, and the static voltage stability of the system can be judged.
Therefore, the margin ratio index based on the static voltage stability limit provided by the invention can intuitively embody the influence of short-circuit capacity, new energy power and electrical distances among different new energy sources on the static voltage stability, and simultaneously gives consideration to different growth modes of the new energy power in an actual power grid, so that the static voltage stability of the new energy output system can be accurately evaluated.
Exemplary apparatus
Fig. 5 is a schematic structural diagram of a static voltage stability determining device of a new energy multi-station delivery system according to an exemplary embodiment of the present invention. As shown in fig. 5, the apparatus 500 includes:
the first determining module 510 is configured to determine, in the new energy multi-station sending system, that a station is a disturbance station when disturbance power of the station is greatly increased, and determine power growth coefficients of other stations in the new energy multi-station sending system according to wind power prediction, where the other stations are far from the disturbance station, have low output correlation, and have less power variation than the disturbance station;
a second determining module 520, configured to determine a power steady-state limit of the disturbance station according to the short-circuit capacity and impedance of each unit of the disturbance station and the power growth coefficient of the rest station;
a third determining module 530, configured to determine a static voltage stability limit power of the new energy multi-station delivery system according to a power stability limit of the disturbance station and delivery powers of the rest stations;
the fourth determining module 540 is configured to determine a margin ratio indicator of the new energy multi-station delivery system according to the static voltage stability limit power and the initial operating power of the new energy multi-station delivery system, and determine the static voltage stability of the new energy multi-station delivery system according to the margin ratio indicator.
Optionally, the second determining module 520 includes:
the first determining submodule is used for respectively determining a unit power steady-state extremum of each unit of the disturbance station according to the short-circuit capacity, the impedance and the power growth coefficient of the rest station of each unit in the disturbance station;
and the second determining module is used for superposing the unit power steady-state extremum of each unit of the disturbance station and determining the power steady-state extremum of the disturbance station.
Optionally, according to the short-circuit capacity, impedance and power growth coefficient of each unit in the disturbance station and the rest station, the calculation formula of the unit power steady-state extremum of the unit i in the disturbance station is respectively determined as follows:
wherein S is ac,li Is the short-circuit capacity of the new energy unit i studied in the perturbation station l, xeql, ii is the self-impedance of the unit i in the perturbation station l, X eql,ij Is the mutual impedance of the unit i in the disturbance station l and other units in the station, X eqlk Is the transimpedance of the perturbed station l with respect to the other stations k, j=1, 2..n, n is the number of new energy units in the perturbed station, k=1, 2, …, m, m is the number of all stations in the new energy multi-station delivery system, P k ＝K k P k0 ，P k0 Is the initial power of station K k Is the power growth factor of station k.
Optionally, the fourth determining module 540 includes:
the first judging submodule is used for judging that the static voltage of the new energy multi-station sending system is stable under the condition that the margin ratio index is larger than or equal to a preset threshold value;
and the second judging submodule is used for judging that the static voltage of the new energy multi-station sending system is unstable under the condition that the margin ratio index is smaller than the preset threshold value.
Exemplary electronic device
Fig. 6 is a structure of an electronic device provided in an exemplary embodiment of the present invention. As shown in fig. 6, the electronic device 60 includes one or more processors 61 and memory 62.
The processor 61 may be a Central Processing Unit (CPU) or other form of processing unit having data processing and/or instruction execution capabilities and may control other components in the electronic device to perform the desired functions.
Memory 62 may include one or more computer program products that may include various forms of computer-readable storage media, such as volatile memory and/or non-volatile memory. The volatile memory may include, for example, random Access Memory (RAM) and/or cache memory (cache), and the like. The non-volatile memory may include, for example, read Only Memory (ROM), hard disk, flash memory, and the like. One or more computer program instructions may be stored on the computer readable storage medium that may be executed by the processor 61 to implement the methods of the software programs of the various embodiments of the present invention described above and/or other desired functions. In one example, the electronic device may further include: an input device 63 and an output device 64, which are interconnected by a bus system and/or other forms of connection mechanisms (not shown).
In addition, the input device 63 may also include, for example, a keyboard, a mouse, and the like.
The output device 64 can output various information to the outside. The output means 64 may include, for example, a display, speakers, a printer, and a communication network and remote output devices connected thereto, etc.
Of course, only some of the components of the electronic device that are relevant to the present invention are shown in fig. 6 for simplicity, components such as buses, input/output interfaces, etc. being omitted. In addition, the electronic device may include any other suitable components depending on the particular application.
Exemplary computer program product and computer readable storage Medium
In addition to the methods and apparatus described above, embodiments of the invention may also be a computer program product comprising computer program instructions which, when executed by a processor, cause the processor to perform steps in a method according to various embodiments of the invention described in the "exemplary methods" section of this specification.
The computer program product may write program code for performing operations of embodiments of the present invention in any combination of one or more programming languages, including an object oriented programming language such as Java, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device, partly on a remote computing device, or entirely on the remote computing device or server.
Furthermore, embodiments of the present invention may also be a computer-readable storage medium, having stored thereon computer program instructions which, when executed by a processor, cause the processor to perform the steps in a method of mining history change records according to various embodiments of the present invention described in the "exemplary methods" section above in this specification.
The computer readable storage medium may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. The readable storage medium can include, for example, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium would include the following: an electrical connection having one or more wires, a portable disk, a hard disk, random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
The basic principles of the present invention have been described above in connection with specific embodiments, however, it should be noted that the advantages, benefits, effects, etc. mentioned in the present invention are merely examples and not intended to be limiting, and these advantages, benefits, effects, etc. are not to be considered as essential to the various embodiments of the present invention. Furthermore, the specific details disclosed herein are for purposes of illustration and understanding only, and are not intended to be limiting, as the invention is not necessarily limited to practice with the above described specific details.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different manner from other embodiments, so that the same or similar parts between the embodiments are mutually referred to. For system embodiments, the description is relatively simple as it essentially corresponds to method embodiments, and reference should be made to the description of method embodiments for relevant points.
The block diagrams of the devices, systems, apparatuses, systems according to the present invention are merely illustrative examples and are not intended to require or imply that the connections, arrangements, configurations must be made in the manner shown in the block diagrams. As will be appreciated by one of skill in the art, the devices, systems, apparatuses, systems may be connected, arranged, configured in any manner. Words such as "including," "comprising," "having," and the like are words of openness and mean "including but not limited to," and are used interchangeably therewith. The terms "or" and "as used herein refer to and are used interchangeably with the term" and/or "unless the context clearly indicates otherwise. The term "such as" as used herein refers to, and is used interchangeably with, the phrase "such as, but not limited to.
The method and system of the present invention may be implemented in a number of ways. For example, the methods and systems of the present invention may be implemented by software, hardware, firmware, or any combination of software, hardware, firmware. The above-described sequence of steps for the method is for illustration only, and the steps of the method of the present invention are not limited to the sequence specifically described above unless specifically stated otherwise. Furthermore, in some embodiments, the present invention may also be embodied as programs recorded in a recording medium, the programs including machine-readable instructions for implementing the methods according to the present invention. Thus, the present invention also covers a recording medium storing a program for executing the method according to the present invention.
It is also noted that in the systems, devices and methods of the present invention, components or steps may be disassembled and/or assembled. Such decomposition and/or recombination should be considered as equivalent aspects of the present invention. The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the invention. Thus, the present invention is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit embodiments of the invention to the form disclosed herein. Although a number of example aspects and embodiments have been discussed above, a person of ordinary skill in the art will recognize certain variations, modifications, alterations, additions, and subcombinations thereof.
Claims (5)
1. A method for determining static voltage stability of a new energy multi-station delivery system, comprising:
in a new energy multi-station sending system, under the condition that the disturbance power of a certain station is greatly increased, determining that the station is a disturbance station, and determining the power growth coefficients of other stations in the new energy multi-station sending system according to wind power prediction;
determining a power steady-state limit of the disturbance station according to the short-circuit capacity and impedance of each unit of the disturbance station and the power growth coefficients of the rest stations;
determining the static voltage stability limit power of the new energy multi-station sending system according to the power stability limit of the disturbance station and the sending power of the rest stations;
determining a margin ratio index of the new energy multi-station delivery system according to the static voltage stability limit power and the initial operation power of the new energy multi-station delivery system, and determining the static voltage stability of the new energy multi-station delivery system according to the margin ratio index, wherein
Determining the power steady-state limit of the disturbance station according to the short-circuit capacity, the impedance of each unit in the disturbance station and the power growth coefficients of the rest stations, wherein the operation comprises the following steps:
and respectively determining a unit power steady-state extremum of each unit of the disturbance station according to the short-circuit capacity and the impedance of each unit in the disturbance station and the power growth coefficients of the rest stations, wherein the calculation formula is as follows:
wherein S is ac,li Is the short-circuit capacity, X of the new energy unit i studied in the disturbance station l eql,ii Is the self-impedance of the unit i in the disturbance station l, X eql,ij Is the mutual impedance of the unit i in the disturbance station l and other units in the station, X eqlk Is the transimpedance of the perturbed station l with respect to the other stations k, j=1, 2..n, n is the number of new energy units in the perturbed station, k=1, 2, …, m, m is the number of all stations in the new energy multi-station delivery system, P k ＝K k P k0 ，P k0 Is the initial power of station K k Is the power growth factor of station k;
and superposing the unit power steady-state extremum of each unit of the disturbance station, and determining the power steady-state extremum of the disturbance station.
2. The method of claim 1, wherein determining the static voltage stability of the new energy multi-station delivery system based on the margin ratio indicator comprises:
judging that the static voltage of the new energy multi-station sending system is stable under the condition that the margin ratio index is larger than or equal to a preset threshold value;
and under the condition that the margin ratio index is smaller than the preset threshold value, judging that the static voltage of the new energy multi-station sending-out system is unstable.
3. A device for determining the static voltage stability of a new energy multi-station delivery system, comprising:
the first determining module is used for determining that a station is a disturbance station in a new energy multi-station sending system under the condition that disturbance power of a certain station is greatly increased, and determining power growth coefficients of other stations in the new energy multi-station sending system according to wind power prediction;
the second determining module is used for determining the power steady-state limit of the disturbance station according to the short-circuit capacity and impedance of each unit of the disturbance station and the power growth coefficients of the rest stations;
the third determining module is used for determining the static voltage stability limit power of the new energy multi-station sending system according to the power stability limit of the disturbance station and the sending power of the rest stations;
a fourth determining module, configured to determine a margin ratio index of the new energy multi-station delivery system according to the static voltage stability limit power and the initial operating power of the new energy multi-station delivery system, and determine the static voltage stability of the new energy multi-station delivery system according to the margin ratio index, where
A second determination module comprising:
the first determining submodule is used for respectively determining the unit power steady-state extremum of each unit of the disturbance station according to the short-circuit capacity and the impedance of each unit in the disturbance station and the power growth coefficients of the rest stations, and the calculation formula is as follows:
wherein S is ac,li Is the short-circuit capacity, X of the new energy unit i studied in the disturbance station l eql,ii Is the self-impedance of the unit i in the disturbance station l, X eql,ij Is the mutual impedance of the unit i in the disturbance station l and other units in the station, X eqlk Is the transimpedance of the perturbed station l with respect to the other stations k, j=1, 2..n, n is the number of new energy units in the perturbed station, k=1, 2, …, m, m is the number of all stations in the new energy multi-station delivery system, P k ＝K k P k0 ，P k0 Is the initial power of station K k Is the power growth factor of station k;
and the second determining submodule is used for superposing unit power steady-state extremum of each unit of the disturbance field station and determining the power steady-state extremum of the disturbance field station.
4. A computer readable storage medium, characterized in that the storage medium stores a computer program for executing the method of any of the preceding claims 1-2.
5. An electronic device, the electronic device comprising:
a processor;
a memory for storing the processor-executable instructions;
the processor is configured to read the executable instructions from the memory and execute the instructions to implement the method of any of the preceding claims 1-2.
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