CN115940173A - Method and device for determining static voltage stability of new energy multi-field station sending-out system - Google Patents
Method and device for determining static voltage stability of new energy multi-field station sending-out system Download PDFInfo
- Publication number
- CN115940173A CN115940173A CN202211599985.5A CN202211599985A CN115940173A CN 115940173 A CN115940173 A CN 115940173A CN 202211599985 A CN202211599985 A CN 202211599985A CN 115940173 A CN115940173 A CN 115940173A
- Authority
- CN
- China
- Prior art keywords
- station
- power
- new energy
- disturbance
- determining
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000003068 static effect Effects 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000004590 computer program Methods 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 8
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 7
- 230000014509 gene expression Effects 0.000 description 7
- 238000012545 processing Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000009795 derivation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000001914 calming effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000005055 memory storage Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a method and a device for determining the static voltage stability of an energy multi-field station sending-out system. The method comprises the following steps: in the new energy multi-station sending-out system, under the condition that the power of a certain station subjected to disturbance is greatly increased, the station is determined to be a disturbance station, and the power increase coefficients of the rest stations in the new energy multi-station sending-out system are determined 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 increase coefficients of other stations; determining the static voltage stability limit power of the new energy multi-station sending system according to the power steady state limit of the disturbance station and the sending power of the other stations; and determining a margin ratio index of the new energy multi-yard delivery system according to the static voltage stability limit power and the initial operating power of the new energy multi-yard delivery system, and determining the static voltage stability of the new energy multi-yard delivery system according to the margin ratio index.
Description
Technical Field
The invention relates to the technical field of power system stability analysis, in particular to a method and a device for determining static voltage stability of a new energy multi-field station sending-out system.
Background
As the new energy has the characteristics of low carbon, environmental protection, sustainable development and the like, the generated energy of renewable energy in China is steadily increased in recent years, the new energy proportion in an electric power system is gradually increased, and the new energy generation is marked to become the main force of future electric power supply in China. Therefore, the static voltage stability of the new energy multi-field station delivery system is researched, and the evaluation of the static voltage stability margin of the delivery system is 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 applied to the static voltage stability evaluation of the direct current access alternating current system at first, and the short circuit ratio in the single direct current feed-in system is derived based on a single-point static voltage stability analysis formula, so that the static voltage stability can be effectively evaluated. However, the multi-feed short-circuit ratio applied to the new energy multi-field station sending-out 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 two aspects of visual embodiment of influencing factors of new energy sending static voltage stability and strict geographical theory derivation of critical short-circuit ratio. Meanwhile, for the problem of static voltage stability of multi-point power transmission, the current short circuit ratio index does not consider the influence of different increasing modes of system power on the static voltage stability.
In the prior art, the other new energy stations are equivalently aggregated to the station to be researched, so that a new energy multi-station sending-out system can be equivalently a single-point sending-out system, and at the moment, according to the definition of a single-feed short-circuit ratio, a short-circuit ratio index in the new energy multi-station system can be obtained. There are two disadvantages: first, the threshold of the threshold lacks a rigorous theoretical derivation. Secondly, when the power of the station under study is greatly increased, the different increasing modes of the power of the rest stations correspond to different static stability limits, and the influence of the different increasing modes of the system power on the static voltage stability is not considered in the prior art.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a method and a device for determining the static voltage stability of a new energy multi-field station sending-out system.
According to an aspect of the present invention, there is provided a method for determining static voltage stability of a new energy multi-farm station outgoing system, including:
in the new energy multi-station sending-out system, under the condition that the power of a certain station subjected to disturbance is greatly increased, the station is determined to be a disturbance station, and power growth coefficients of other stations in the new energy multi-station sending-out system are determined according to wind power prediction, wherein the other stations are far away from the disturbance station, the output correlation is low, and the change of the power 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 increase coefficients of other stations;
determining the static voltage stability limit power of the new energy multi-station sending-out system according to the power steady-state limit of the disturbance station and the sending-out power of the other stations;
and determining a margin ratio index of the new energy multi-field station sending-out system according to the static voltage stability limit power and the initial operation power of the new energy multi-field station sending-out system, and determining the static voltage stability of the new energy multi-field station sending-out system according to the margin ratio index.
Optionally, the operation of determining the power steady-state limit of the disturbance station according to the short-circuit capacity and the impedance of each unit in the disturbance station and the power increase coefficients of the remaining stations includes:
respectively determining the unit power steady-state extreme values of each unit of the disturbance station according to the short-circuit capacity and impedance of each unit in the disturbance station and the power increase coefficients of other stations;
and superposing the unit power steady-state extreme values of all the units of the disturbance station to determine the power steady-state extreme values of the disturbance station.
Optionally, according to the short-circuit capacity and the impedance of each unit in the disturbance station and the power increase coefficients of the other stations, a calculation formula for respectively determining a unit power steady-state extreme value of a unit i in the disturbance station is as follows:
wherein S is ac,li Is the short circuit capacity of the new energy unit i studied in the disturbance station l, xeql, ii is the self-impedance of the unit i in the disturbance station l, X eql,ij Is the mutual impedance, X, of the unit i in the disturbance station and other units in the station eqlk Is the mutual impedance of a disturbance station l and other stations k, j =1,2,.., n, n is the number of new energy source units in the disturbance station, k =1,2, …, m, m is the number of all stations in the new energy source multi-station sending system, and P is the number of all stations in the new energy source multi-station sending system k ＝K k P k0 ，P k0 Is the initial power of station K, K k Is the power increase factor for station k.
Optionally, the operation of determining the static voltage stability of the new energy multi-farm dispatch system according to the margin ratio index includes:
under the condition that the margin ratio index is greater than or equal to a preset threshold value, determining that the static voltage of the new energy multi-field 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-field station sending-out system is unstable.
According to another aspect of the present invention, there is provided an apparatus for determining static voltage stabilization of a new energy multi-farm dispatch system, including:
the system comprises a first determining module, a second determining module and a control module, wherein the first determining module is used for determining that a station is a disturbance station under the condition that the disturbance power of the station is greatly increased in the new energy multi-station sending-out system, and determining the power increase coefficients of other stations in the new energy multi-station sending-out system according to wind power prediction, wherein the other stations are far away from the disturbance station, the output correlation is low, and the change of power is smaller than that of 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 increase coefficients of other 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 steady-state limit of the disturbance station and the sending power of the other stations;
and the fourth determining module is used for determining a margin ratio index of the new energy multi-field station sending-out system according to the static voltage stability limit power and the initial operating power of the new energy multi-field station sending-out system and determining the static voltage stability of the new energy multi-field station sending-out system according to the margin ratio index.
According to a further aspect of the present invention there is provided a computer readable storage medium having stored thereon a computer program for performing the method of any of the above aspects of the present invention.
According to still another aspect of the present invention, there is provided an electronic apparatus 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 one of the above aspects of the present invention.
Therefore, the invention provides a method for determining the static voltage stability of a new energy multi-field station sending system, which is characterized in that a new energy multi-field station margin ratio index is obtained according to a static voltage stability limit through calculation of static voltage stability limit power of the new energy multi-field station sending system, and the static voltage stability of the system is further evaluated.
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 schematic flowchart of a method for determining static voltage stability of a new energy multi-farm dispatch system according to an exemplary embodiment of the present invention;
fig. 2 is a schematic diagram of a new energy two-station dispatch system according to an exemplary embodiment of the present invention;
FIG. 3 is a schematic diagram of the equivalent circuit of FIG. 2 after splitting;
fig. 4 is a schematic diagram of an exemplary structure of a new energy source multi-station dispatch according to an exemplary embodiment of the present invention;
fig. 5 is a schematic structural diagram of a static voltage stability determination apparatus of a new energy multi-farm station outgoing system according to an exemplary embodiment of the present invention;
fig. 6 is a structure of an electronic device according to an exemplary embodiment of the present invention.
Detailed Description
Hereinafter, example embodiments according to the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the described embodiments are only some of the embodiments of the present invention, and not all of the embodiments of the present invention, and it should be understood that the present invention is not limited by the exemplary embodiments described herein.
It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
It will be understood by those skilled in the art that the terms "first", "second", etc. in the embodiments of the present invention are used only for distinguishing different steps, devices or modules, etc., and do not denote any particular technical meaning or necessarily order therebetween.
It should also be understood that in embodiments of the present invention, "a plurality" may refer to two or more and "at least one" may refer to one, two or more.
It should also be understood that any reference to any component, data, or structure in an embodiment of the invention may be generally understood as one or more, unless explicitly stated otherwise or indicated otherwise herein.
In addition, the term "and/or" in the present invention is only one kind of association relationship describing the associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In the present invention, the character "/" generally indicates that the preceding and following related objects are in 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 the same or similar parts may be referred to each other, so that the descriptions thereof are omitted for brevity.
Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Embodiments of the invention are operational with numerous other general purpose or special purpose computing system environments or configurations, and with numerous other electronic devices such as terminal devices, computer systems, servers, and the like. Examples of well known terminal devices, computing systems, environments, and/or configurations that may be suitable for use with electronic devices, such as terminal devices, computer systems, servers, and the like, 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 environments that include any of the above, 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 practiced in distributed cloud computing environments where 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 computer system storage media including memory storage devices.
Exemplary method
Fig. 1 is a schematic flowchart of a method for determining static voltage stability of a new energy multi-farm dispatch system according to an exemplary embodiment of the present invention. The present embodiment can be applied to an electronic device, and as shown in fig. 1, the method 100 for determining the static voltage stability of a new energy multi-farm dispatch system includes the following steps:
103, 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 other stations;
and 104, determining a margin ratio index of the new energy multi-field station sending-out system according to the static voltage stability limit power and the initial operation power of the new energy multi-field station sending-out system, and determining the static voltage stability of the new energy multi-field station sending-out system according to the margin ratio index.
Optionally, the operation of determining the power steady-state limit of the disturbance station according to the short-circuit capacity and impedance of each unit in the disturbance station and the power increase coefficients of the remaining stations includes:
respectively determining the unit power steady-state extreme values of each unit of the disturbance station according to the short-circuit capacity and impedance of each unit in the disturbance station and the power increase coefficients of other stations;
and superposing the unit power steady-state extreme values of all the units of the disturbance station to determine the power steady-state extreme value of the disturbance station.
Optionally, according to the short-circuit capacity and the impedance of each unit in the disturbance station and the power increase coefficients of the other stations, a calculation formula for respectively determining a unit power steady-state extreme value of a unit i in the disturbance station is as follows:
wherein S is ac,li Is the short circuit capacity of the new energy unit i studied in the disturbance station l, xeql, ii is the self-impedance of the unit i in the disturbance station l, X eql,ij Is the mutual impedance, X, of the unit i in the disturbance station and other units in the station eqlk Is the mutual impedance of a disturbance field station l and other field stations k, j =1,2, is., n, n is the number of new energy source units in the disturbance field station, k =1,2, …, m, m is the number of all field stations in the new energy multi-field station sending system, and P is the number of all field stations in the new energy multi-field station sending system k ＝K k P k0 ，P k0 Is the initial power of station K, K k Is the power increase factor for station k.
Optionally, the operation of determining the static voltage stability of the new energy multi-farm station sending-out system according to the margin ratio index includes:
under the condition that the margin ratio index is greater than or equal to a preset threshold value, determining that the static voltage of the new energy multi-field station sending-out system is stable;
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-field station sending-out system is unstable.
Specifically, the static voltage stability analysis margin ratio index of the new energy multipoint sending-out 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 the practical engineering application can be better judged. Meanwhile, the index can intuitively reflect the influence of short circuit capacity, electrical distance and power generated by other new energy sources on the new energy sources to be researched, also accords with a power increasing mode in practical engineering application, solves the problem that the existing short circuit ratio calculation method cannot take both the short circuit capacity and the electrical distance into account, and has wider application scenes.
Specifically, when the power of the researched station is greatly increased, different increasing modes of the power of other stations correspond to different static stability limits, the margin ratio index is deduced from the static stability limit of a single point and is finally expanded to a multi-point sending-out system, and the margin ratio index has a strict equivalent relation with static voltage stability, so that the influence of the electric distance and the power generated by other new energy sources on the researched new energy source unit can be visually reflected, and the static stability limits of the system under different power increasing modes can be better reflected.
The invention discloses a method for determining an index of a margin ratio for evaluating static voltage stability of a new energy multi-field station system.
Step 1, calculating the stable limit power of the static voltage of the new energy multi-field station sending-out system
For the new energy two-station delivery system as shown in fig. 2, X in fig. 2 3 Can be split into X in figure 3 31 And X 32 . To ensure system equivalence before and after splitting, i.e. X 3 The voltage at two ends is not changed, and the reactance splitting can meet the following two conditions:
(1) Decoupled X 31 And X 32 The power flowing through it should conform to power transfer expression (1).
In the formula: p is the power of the line transmission; u shape 0 、U 3 Respectively connecting the two ends of the line with voltage; x is the equivalent reactance between two ends of the line; deltaIs the difference between the power angles at the two ends.
(2)X 31 And X 32 After parallel connection, X is equal to X before splitting 3 . Such a power coupled line can be decoupled into lines where each station power is sent out separately.
In practical engineering application, the disturbed power of one new energy unit is changed, and the power change of other new energy units which are far away and have low output correlation is smaller than that of the disturbed unit. Based on this situation, let P 1 Increase, P 2 Is KP 20 Where K is the station 2 power increase coefficient. In this growth mode, the steady-state limit P of the station 1 is defined according to equation (1) and fig. 3 1max The expression is shown as formula (2), X 31 The formula (3) can be written.
Wherein X 31 For splitting the reactance, P, of one-way flow of the rear station 1 1max Is the calming limit of station 1, P 20 Is the initial power of station 2.
The reactance X flowing in one way through the split post-station 1 obtained by solving the formula (3) 31 Substituting formula (2) to obtain P 1max The expression of (a) is as follows:
self-impedance X of circuit eq11 ＝X 3 Mutual impedance X eq12 ＝X 1 +X 3 Short circuit capacity S of station 1 ac1 ＝1/X eq11 Substituting the above-mentioned P 1max Is expressed by 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 a static stability limit expression of each unit in a station l in the multi-station system can be obtained by using the reactance splitting method in the two-station system, and is shown in formula (6). As 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 stability limits of all the units, namely P lmax ＝jP imax 。
Wherein S is ac,li Is the short circuit capacity of the new energy unit i studied in the disturbance station l, xeql, ii is the self-impedance of the unit i in the disturbance station l, X eql,ij Is the mutual impedance, X, of the unit i in the disturbance station and other units in the station eqlk Is the mutual impedance of a disturbance field station l and other field stations k, j =1,2, is., n, n is the number of new energy source units in the disturbance field station, k =1,2, …, m, m is the number of all field stations in the new energy multi-field station sending system, and P is the number of all field stations in the new energy multi-field station sending system k ＝K k P k0 ，P k0 Is the initial power of station K, K k Is the power increase factor for station k.
From the above formula, it can be seen that 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 P is passed max ＝jP imax +P 2 +P 3 ···+P k The limit power can be stabilized by the static voltage of the whole system.
Step 2, evaluating the static voltage stability of the system according to the margin ratio index of the new energy multi-station
In an electric power system, when the system is critically stable, the power of a load is the maximum power which can be transmitted by the system, and for a multi-node transmitting (or receiving) system, in the process of power increase of a plurality of nodes, the following general ideas are considered: a node reaches its quiescence firstAt the limit, the stationarity limit of the entire outgoing (or incoming) system is then determined, and the stationarity limit of the system can be measured by the node that first reaches the stationarity limit at that point. Therefore, the static voltage stability margin ratio index of the new energy source unit to be researched is defined as the limit power P of the new energy source unit to be researched max And initial operating power P 0 Ratio of (i.e. P) max /P 0 And (6) obtaining an expression for evaluating the margin ratio index of the stability of the static voltage of the new energy multi-field station sending system as follows:
in the formula: p 0 The initial power of the unit to be researched in the new energy multi-station system. P j The influence of different increasing 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 mutual impedance and the short circuit capacity in real time, and the static voltage stability of the system is judged.
Therefore, the margin ratio index based on the stability limit of the static voltage provided by the invention can intuitively reflect the influence of short circuit capacity, new energy power and electric distances among different new energy sources on the stability of the static voltage, simultaneously considers different increasing modes of the new energy power in an actual power grid, and can accurately evaluate the stability of the static voltage of a new energy delivery system.
Exemplary devices
Fig. 5 is a schematic structural diagram of a static voltage stability determination apparatus of a new energy multi-farm station-sending 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-farm dispatch system, that a certain farm is a disturbance farm when the disturbance power of the farm is greatly increased, and determine power growth coefficients of the remaining farms in the new energy multi-farm dispatch system according to wind power prediction, where the remaining farms are farther from the disturbance farm, the output correlation is lower, and the change in power is smaller than that of the disturbance farm;
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 increase coefficients of the other stations;
a third determining module 530, configured to determine a static voltage stability limit power of the new energy multi-station sending-out system according to the power steady-state limit of the disturbance station and the sending powers of the other stations;
a fourth determining module 540, configured to determine a margin ratio index of the new energy multi-farm dispatch system according to the static voltage stability limit power and the initial operating power of the new energy multi-farm dispatch system, and determine static voltage stability of the new energy multi-farm dispatch system according to the margin ratio index.
Optionally, the second determining module 520 includes:
the first determining submodule is used for respectively determining the unit power steady-state extreme value of each unit of the disturbance station according to the short-circuit capacity and impedance of each unit in the disturbance station and the power increase coefficients of other stations;
and the second determining module is used for superposing the unit power steady-state extreme values of all the units of the disturbance station to determine the power steady-state extreme values of the disturbance station.
Optionally, according to the short-circuit capacity and the impedance of each unit in the disturbance station and the power increase coefficients of the other stations, a calculation formula for determining a unit power steady-state extreme value of the unit i in the disturbance station is respectively as follows:
wherein S is ac,li Is the short-circuit capacity of the new energy unit i studied in the disturbance station l, xeql, ii is the self-impedance of the unit i in the disturbance station l, X eql,ij Is the mutual impedance, X, of the unit i in the disturbance station and other units in the station eqlk Is the mutual impedance of the disturbance field station l and other field stations k, j =1,2,.., n, n is the number of new energy source units in the disturbance field station, k =1,2, …, m, m is new energyNumber of all stations, P, in the source multi-station dispatch system k ＝K k P k0 ，P k0 Is the initial power of station K, K k Is the power increase factor for station k.
Optionally, the fourth determining module 540 includes:
the first judgment submodule is used for judging the stability of the static voltage of the new energy multi-field station sending system under the condition that the margin ratio index is greater than or equal to a preset threshold value;
and the second stator judging module is used for judging that the static voltage of the new energy multi-field station sending-out system is unstable under the condition that the margin ratio index is smaller than a preset threshold value.
Exemplary electronic device
Fig. 6 is a structure of an electronic device according to an exemplary embodiment of the present invention. As shown in fig. 6, the electronic device 60 includes one or more processors 61 and a memory 62.
The processor 61 may be a Central Processing Unit (CPU) or other form of processing unit having data processing capabilities and/or instruction execution capabilities, and may control other components in the electronic device to perform desired functions.
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 devices 64 may include, for example, a display, speakers, a printer, and a communication network and its connected remote output devices, among others.
Of course, for simplicity, only some of the components of the electronic device that are relevant to the present invention are shown in fig. 6, omitting components such as buses, input/output interfaces, and the like. 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 above-described methods and apparatus, embodiments of the invention may also be computer program products comprising computer program instructions which, when executed by a processor, cause the processor to perform the steps in the methods according to various embodiments of the invention described in the "exemplary methods" section of this specification above.
The computer program product may write program code for carrying out operations for 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 and 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 the method of information mining of historical change records according to various embodiments of the present invention described in the "exemplary methods" section above of this specification.
The computer-readable storage medium may take any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may include, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc 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 with reference to specific embodiments, but it should be noted that the advantages, effects, etc. mentioned in the present invention are only examples and are not limiting, and the advantages, effects, etc. must not be considered to be possessed by various embodiments of the present invention. Furthermore, the foregoing disclosure of specific details is for the purpose of illustration and description and is not intended to be limiting, since the invention is not limited to the specific details described above.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts in the embodiments are referred to each other. For the system embodiment, since it basically corresponds to the method embodiment, the description is relatively simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The block diagrams of devices, systems, apparatuses, and systems involved in the present invention are merely illustrative examples and are not intended to require or imply that the devices, systems, apparatuses, and systems must be connected, arranged, or configured in the manner shown in the block diagrams. These devices, systems, apparatuses, systems may be connected, arranged, configured in any manner, as will be appreciated by those skilled in the art. Words such as "including," "comprising," "having," and the like are open-ended words that mean "including, but not limited to," and are used interchangeably herein. The words "or" and "as used herein mean, and are used interchangeably with, the word" and/or, "unless the context clearly dictates otherwise. The word "such as" is used herein to mean, 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 in software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order for the steps of the method is for illustrative purposes only, and the steps of the method of the present invention are not limited to the order specifically described above unless specifically indicated otherwise. Furthermore, in some embodiments, the present invention may also be embodied as a program recorded in a recording medium, the program including machine-readable instructions for implementing a method 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 should also be noted that in the systems, apparatus and methods of the present invention, the various components or steps may be broken down and/or re-combined. These decompositions and/or recombinations are to be regarded as equivalents 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, the description is not intended to limit embodiments of the invention to the form disclosed herein. While a number of example aspects and embodiments have been discussed above, those of skill in the art will recognize certain variations, modifications, alterations, additions and sub-combinations thereof.
Claims (7)
1. A method for determining static voltage stability of a new energy multi-field station sending system is characterized by comprising the following steps:
in the new energy multi-station sending-out system, under the condition that the power of a certain station subjected to disturbance is greatly increased, the station is determined to be a disturbance station, and the power increase coefficients of other stations in the new energy multi-station sending-out system are determined according to wind power prediction, wherein the other stations are far away from the disturbance station, the output correlation is low, and the change of the power is smaller than that of the disturbance station;
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 increase coefficients of the rest stations;
determining the static voltage stability limit power of the new energy multi-station sending system according to the power steady state limit of the disturbance station and the sending power of the rest stations;
and determining a margin ratio index of the new energy multi-field station sending-out system according to the static voltage stability limit power and the initial operating power of the new energy multi-field station sending-out system, and determining the static voltage stability of the new energy multi-field station sending-out system according to the margin ratio index.
2. The method of claim 1, wherein the act of determining a steady state limit for power for the perturbation station based on the short circuit capacity, impedance of each unit in the perturbation station and the power growth coefficients of the remaining stations comprises:
respectively determining a unit power steady-state extreme value of each unit of the disturbance station according to the short-circuit capacity and impedance of each unit of the disturbance station and the power increase coefficients of the rest stations;
and superposing the unit power steady-state extreme values of all the units of the disturbance station, and determining the power steady-state extreme values of the disturbance station.
3. The method according to claim 1, wherein the calculation formula for determining the steady-state limit value of the unit power of the unit i in the disturbance station according to the short-circuit capacity and impedance of each unit in the disturbance station and the power increase coefficients of the rest stations 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, X, of the unit i in the disturbance station l eql,ij Is the mutual impedance, X, of the unit i in the disturbance station and other units in the station eqlk Is the mutual impedance of a disturbance station l and other stations k, j =1,2,.., n, n is the number of new energy source units in the disturbance station, k =1,2, …, m, m is the number of all stations in the new energy source multi-station sending system, and P is the number of all stations in the new energy source multi-station sending system k ＝K k P k0 ，P k0 Is the initial power of station K, K k Is the power increase factor for station k.
4. The method of claim 1, wherein determining the static voltage stability of the new energy multi-farm dispatch system based on the margin ratio indicator comprises:
determining that the static voltage of the new energy multi-field station sending-out system is stable under the condition that the margin ratio index is greater 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-field station sending-out system is unstable.
5. A device for determining static voltage stability of a new energy multi-field station sending system is characterized by comprising:
the system comprises a first determining module, a second determining module and a control module, wherein the first determining module is used for determining that a station is a disturbance station under the condition that the disturbance power of the station is greatly increased in a new energy multi-station sending-out system, and determining the power increase coefficients of other stations in the new energy multi-station sending-out system according to wind power prediction, wherein the other stations are far away from the disturbance station, the output correlation is low, and the change of power is smaller than that of the disturbance station;
a second determining module, 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 increase coefficients of the other stations;
a third determining module, configured to determine, according to the power steady-state limit of the disturbance station and the output powers of the remaining stations, a static voltage stability limit power of the new-energy multi-station output system;
and the fourth determining module is used for determining a margin ratio index of the new energy multi-field station sending-out system according to the static voltage stability limit power and the initial operating power of the new energy multi-field station sending-out system, and determining the static voltage stability of the new energy multi-field station sending-out system according to the margin ratio index.
6. A computer-readable storage medium, characterized in that the storage medium stores a computer program for performing the method of any of the preceding claims 1-4.
7. An electronic device, characterized in that the electronic device comprises:
a processor;
a memory for storing the processor-executable instructions;
the processor is used for reading the executable instructions from the memory and executing the instructions to realize the method of any one of the claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211599985.5A CN115940173B (en) | 2022-12-12 | 2022-12-12 | Method and device for determining static voltage stability of new energy multi-station delivery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211599985.5A CN115940173B (en) | 2022-12-12 | 2022-12-12 | Method and device for determining static voltage stability of new energy multi-station delivery system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115940173A true CN115940173A (en) | 2023-04-07 |
| CN115940173B CN115940173B (en) | 2023-08-15 |
Family
ID=86650543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211599985.5A Active CN115940173B (en) | 2022-12-12 | 2022-12-12 | Method and device for determining static voltage stability of new energy multi-station delivery system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115940173B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140244065A1 (en) * | 2013-02-26 | 2014-08-28 | Washington State University | Voltage stability monitoring in power systems |
| CN111092433A (en) * | 2019-12-12 | 2020-05-01 | 国家电网公司华北分部 | System static voltage stability margin estimation method based on Thevenin equivalence |
| CN112564175A (en) * | 2021-02-19 | 2021-03-26 | 中国电力科学研究院有限公司 | New energy multi-station short circuit ratio calculation method and device and storage medium |
| CN113852120A (en) * | 2021-08-25 | 2021-12-28 | 中国电力科学研究院有限公司 | Method and system for determining maximum grid-connected capacity of new energy power generation |
| CN114977191A (en) * | 2022-06-30 | 2022-08-30 | 中国电力科学研究院有限公司 | Static voltage stability analysis method and device and computer storage medium |
-
2022
- 2022-12-12 CN CN202211599985.5A patent/CN115940173B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140244065A1 (en) * | 2013-02-26 | 2014-08-28 | Washington State University | Voltage stability monitoring in power systems |
| CN111092433A (en) * | 2019-12-12 | 2020-05-01 | 国家电网公司华北分部 | System static voltage stability margin estimation method based on Thevenin equivalence |
| CN112564175A (en) * | 2021-02-19 | 2021-03-26 | 中国电力科学研究院有限公司 | New energy multi-station short circuit ratio calculation method and device and storage medium |
| CN113852120A (en) * | 2021-08-25 | 2021-12-28 | 中国电力科学研究院有限公司 | Method and system for determining maximum grid-connected capacity of new energy power generation |
| CN114977191A (en) * | 2022-06-30 | 2022-08-30 | 中国电力科学研究院有限公司 | Static voltage stability analysis method and device and computer storage medium |
Non-Patent Citations (2)
| Title |
|---|
| LIN YU 等: "A Critical System Strength Evaluation of a Power System with High Penetration of Renewable Energy Generations", CSEE JOURNAL OF POWER AND ENERGY SYSTEMS, vol. 8, no. 3, pages 710 - 720 * |
| 于琳 等: "新能源并网系统短路比指标分析及临界短路比计算方法", 中国电机工程学报, vol. 42, no. 3, pages 919 - 927 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115940173B (en) | 2023-08-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113904375B (en) | New energy grid-connected system voltage support strength evaluation method and system | |
| US20160048150A1 (en) | Method and apparatus for optimal power flow with voltage stability for large-scale electric power systems | |
| CN113922376B (en) | Power system minimum inertia evaluation method and system considering frequency stability constraint | |
| WO2018186001A1 (en) | Power system stabilization device and power system stabilization method | |
| CN115659838A (en) | Method and device for constructing digital twin hybrid model of main equipment of power system | |
| CN115842333A (en) | Short-term joint optimization scheduling method and system for distributed power supply cluster | |
| Saleem et al. | Assessment and management of frequency stability in low inertia renewable energy rich power grids | |
| CN115940173A (en) | Method and device for determining static voltage stability of new energy multi-field station sending-out system | |
| CN112785023B (en) | Method and device for measuring weight of article, electronic equipment and storage medium | |
| CN116645238A (en) | Method for calculating line loss rate of photovoltaic power supply-containing low-voltage distribution network based on voltage loss | |
| Zhao et al. | Electrical principles of verification of the topological structure of a low‐voltage distribution network based on voltage from an Advanced Metering Infrastructure | |
| CN115912355A (en) | Method, device, equipment and medium for dividing power supply area of transformer substation | |
| CN117220296B (en) | Power grid voltage stability analysis method and system considering new energy control switching | |
| CN115308666B (en) | Device and method for measuring error of wide-range current transformer | |
| CN112560210A (en) | Method for adjusting a power grid structure, associated device and computer program product | |
| CN118214458B (en) | Method, device and medium for identifying areas of high-speed power carrier communication system | |
| Cao et al. | Novel techniques for continuation method to calculate the limit-induced bifurcation of the power flow equation | |
| CN117692463B (en) | Block generation method, device, equipment and medium based on block chain network | |
| Heidari et al. | A comparative study of different dynamic line rating standards considering transient heat balance | |
| CN115313413A (en) | New energy step type virtual inertia control method and device and storage medium | |
| CN115276040B (en) | Synchronous power grid power system primary frequency modulation safety margin evaluation method and device | |
| CN116780617A (en) | New energy source voltage support strength evaluation method through flexible straight island sending system | |
| CN118444065A (en) | Fault line steady-state quantitative phase selection method, device and medium for power transmission line | |
| CN117096852A (en) | New energy carrying capacity assessment method of power grid considering new energy frequency modulation capacity | |
| US20230213569A1 (en) | Systems and methods for estimating power loss using point-to-point differential load calculations |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |