CN116365523A - Tidal current calculation method, device, equipment and medium applied to power distribution network - Google Patents
Tidal current calculation method, device, equipment and medium applied to power distribution network Download PDFInfo
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Abstract
The embodiment of the invention discloses a power flow calculation method applied to a power distribution network, which comprises the following steps: determining admittance information of each branch in a circuit equivalent model of the power distribution network based on the parameter information of the power distribution network; the parameter information comprises transformation ratio information and impedance information of the transformer; determining a voltage correction value corresponding to the initial voltage value based on admittance information of each branch, the initial voltage value of the power distribution network and a correction equation; and correcting the initial voltage value based on the voltage correction value to obtain a target voltage value, and determining the power flow information of the power distribution network based on the target voltage value. The technical scheme disclosed by the embodiment of the invention solves the problems of large workload and low efficiency of the current power flow calculation of the power distribution network through manual analysis, realizes the automatic power flow calculation of the power distribution network, and improves the accuracy of calculation.
Description
Technical Field
The invention relates to the technical field of power distribution networks, in particular to a power flow calculation method, a device, equipment and a medium applied to a power distribution network.
Background
The power distribution network planning and related thematic research objects pay attention to future power distribution network development, often have large workload, wide involved area, outstanding complexity and large analysis difficulty, and simultaneously in recent years, the requirement on accurate investment of the power distribution network planning is improved.
At present, the power distribution network planning lacks informatization means support in the aspect of power flow calculation of the power distribution network, the manual analysis workload is large, and difficulties exist in carrying out accurate analysis of power distribution network problems, planning scheme optimization and other works. The information-based support system is urgently needed to be built so as to realize computer-aided power grid planning and thematic research, and the research level and the working efficiency are improved. Therefore, how to improve the efficiency and accuracy of the power flow calculation of the power distribution network and provide a data basis for planning the power distribution network is a technical problem to be solved urgently at present.
Disclosure of Invention
The invention provides a power flow calculation method, a device, equipment and a medium applied to a power distribution network, which are used for realizing automatic power flow calculation of the power distribution network and improving the calculation efficiency and accuracy.
According to an aspect of the present invention, there is provided a power flow calculation method applied to a power distribution network, including:
determining admittance information of each branch in a circuit equivalent model of the power distribution network based on parameter information of the power distribution network; the parameter information comprises transformation ratio information and impedance information of the transformer;
determining a voltage correction value corresponding to the initial voltage value based on admittance information of each branch, the initial voltage value of the power distribution network and a correction equation;
and correcting the initial voltage value based on the voltage correction value to obtain a target voltage value, and determining the power flow information of the power distribution network based on the target voltage value.
According to another aspect of the present invention, there is provided a power flow calculation device applied to a power distribution network, comprising:
the admittance information determining module is used for determining admittance information of each branch in a circuit equivalent model of the power distribution network based on parameter information of the power distribution network; the parameter information comprises transformation ratio information and impedance information of the transformer;
the voltage correction value determining module is used for determining a voltage correction value corresponding to the initial voltage value based on admittance information of each branch, the initial voltage value of the power distribution network and a correction equation;
and the power flow information calculation module is used for correcting the initial voltage value based on the voltage correction value to obtain a target voltage value, and determining the power flow information of the power distribution network based on the target voltage value.
According to another aspect of the present invention, there is provided an electronic apparatus including:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the method for calculating a power flow of a power distribution network according to any of the embodiments of the present invention.
According to another aspect of the present invention, there is provided a computer readable storage medium storing computer instructions for causing a processor to implement the method for calculating a power flow of a power distribution network according to any embodiment of the present invention when executed.
According to the technical scheme, admittance information of each branch in a circuit equivalent model of the power distribution network is determined based on the parameter information of the power distribution network; the parameter information comprises transformation ratio information and impedance information of the transformer; determining a voltage correction value corresponding to the initial voltage value based on admittance information of each branch, the initial voltage value of the power distribution network and a correction equation; the initial voltage value is corrected based on the voltage correction value to obtain a target voltage value, and the power flow information of the power distribution network is determined based on the target voltage value, so that the problems of large workload and low efficiency of the current power flow calculation of the power distribution network through manual analysis are solved, the automatic power flow calculation of the power distribution network is realized, and the calculation accuracy is improved.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a power flow calculation method applied to a power distribution network according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of equivalent circuit simplification according to a first embodiment of the present invention;
FIG. 3 is an equivalent circuit diagram of an ideal transformer connected in accordance with the first embodiment of the present invention;
FIG. 4 is a schematic diagram of an equivalent circuit according to a first embodiment of the present invention;
FIG. 5 is a diagram of a topology connection of a tidal current system to which the second embodiment of the present invention is applied;
FIG. 6 is a simplified equivalent circuit diagram of a second embodiment of the present invention;
fig. 7 is a schematic structural diagram of a power flow calculation device applied to a power distribution network according to a third embodiment of the present invention;
fig. 8 is a schematic structural diagram of an electronic device according to a fourth embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
Fig. 1 is a flowchart of a power flow calculation method applied to a power distribution network according to an embodiment of the present invention, where the method may be performed by a power flow calculation device applied to the power distribution network, the power flow calculation device applied to the power distribution network may be implemented in hardware and/or software, and the power flow calculation device applied to the power distribution network may be configured in an electronic device. As shown in fig. 1, the method includes:
s110, determining admittance information of each branch in a circuit equivalent model of the power distribution network based on parameter information of the power distribution network.
The parameter information includes transformation ratio information and impedance information of the transformer, for example, the transformation ratio information is a transformation ratio of the transformer, the impedance information is an impedance value of the transformer, the circuit equivalent model can be understood as an equivalent circuit diagram of the power distribution network, and the admittance information can be understood as admittance values of all branches in the equivalent circuit diagram.
In this embodiment, before the power flow calculation is performed, a known circuit diagram of the power distribution network is simplified into an equivalent circuit diagram, and according to parameter information of a transformer in the power distribution network, admittance values of all branches in the equivalent circuit diagram can be determined. Fig. 2 is a simplified schematic diagram of an equivalent circuit in an embodiment of the present invention, where the wire portion ignores the wire admittance and takes the wire impedance.
On the basis of the technical scheme, the determining admittance information of each branch in the circuit equivalent model of the power distribution network based on the parameter information of the power distribution network comprises the following steps: equivalent the distribution network to a pi-type circuit diagram, wherein the pi-type circuit diagram comprises at least one branch; and calculating admittance values in all branches in the pi-type circuit diagram based on the transformation ratio information and the impedance information of the transformer, and establishing an admittance matrix of the power distribution network based on the admittance values of all branches.
In this embodiment, for the transformer, since the transformer Γ -type equivalent circuit and the T-type equivalent circuit cannot embody the voltage conversion function actually possessed by the transformer, the pi-type equivalent circuit is used in the computer algorithm of the power flow.
A specific simplified process of the transformer pi-type equivalent circuit model can be seen in fig. 3 and 4. Wherein, fig. 3 is an equivalent circuit diagram after the ideal transformer is connected, and fig. 4 is a pi-type equivalent circuit.
In fig. 3, k is the transformer transformation ratio and ZT is the transformer impedance; in the pi-type equivalent circuit of fig. 4, y12, y21, y10, y20 are the admittance values of the branches in the pi-type equivalent circuit, respectively.
The parameters of each branch in the pi-type equivalent circuit are calculated as follows:
the transformer impedance ZT can be calculated from the transformer short-circuit loss and the short-circuit voltage. After the admittance values of the branches are calculated respectively, a node admittance matrix Y is formed B 。
Node admittance matrix Y B In which the main diagonal element is self admittance and the other elements are transadmittance, the self admittance Yii of node i is equal in value to the sum of the admittances of all the branches directly connected to the node, and transadmittance Yji is equal in value to the negative of the branch admittances of the connecting nodes j, i.
And S120, determining a voltage correction value corresponding to the initial voltage value based on admittance information of each branch, the initial voltage value of the power distribution network and a correction equation.
The initial voltage value of the power distribution network can be understood as a preset initial voltage value, the correction equation can be understood as an equation for correcting the initial voltage value, and the voltage correction value can be understood as a value of the initial voltage value to be corrected.
Specifically, according to admittance information of each branch, an initial voltage value of the power distribution network and a correction equation are calculated, and finally a voltage correction value corresponding to the initial voltage value can be obtained. That is, the initial voltage value needs to be corrected based on the voltage correction value.
On the basis of the above technical solution, the determining the voltage correction value corresponding to the initial voltage value based on admittance information of each branch, the initial voltage value of the power distribution network and the correction equation includes: determining an admittance real part value and an admittance imaginary part value corresponding to the admittance matrix based on the admittance matrix; substituting the initial voltage value, the real part value of the admittance, the imaginary part value of the admittance and the preset power value into the correction equation to determine the unbalance amount of the correction equation.
Wherein the initial voltage value may be an initial value
Is the real part of the voltage vector, ">
Is the imaginary part of the voltage vector; the preset power value refers to a preset power value, including a preset active power value and a preset reactive power value.
Specifically, the initial value of each node voltage is substituted into the correction equation:
solving for unbalance in correction equations
And +.>
Wherein G is ij As the real part of admittance in the node admittance matrix, B ij For the admittance imaginary part, P in the node admittance matrix i As the initial value of active power, Q i Is the initial value of the reactive power,
is the square of the initial value of the voltage amplitude, +.>
As the amount of active power imbalance,
for reactive power imbalance, +.>
Is the square of the magnitude of the voltage imbalance.
On the basis of the above technical solution, the determining the voltage correction value corresponding to the initial voltage value based on admittance information of each branch, the initial voltage value of the power distribution network and the correction equation includes: determining a coefficient matrix of the correction equation based on the unbalance amount of the correction equation and the initial voltage value; and solving the correction equation based on the coefficient matrix to obtain a voltage correction value corresponding to the initial voltage value.
It will be appreciated that the flow calculation can be mathematically reduced to solving a system of nonlinear equations, and accordingly, a matrix of coefficients for the correction equation needs to be determined prior to solving the correction equation. After the coefficient matrix is determined, the correction equation can be solved according to the coefficient matrix to obtain a voltage correction value corresponding to the initial voltage value.
On the basis of the above technical solution, the determining the coefficient matrix of the correction equation based on the unbalance amount of the correction equation and the initial voltage value includes: and establishing a jacobian matrix corresponding to the correction equation, and substituting each unbalance amount and the initial voltage value into the jacobian matrix to obtain a coefficient matrix of the correction equation.
Specifically, a jacobian matrix corresponding to a correction equation is established, and the unbalance amount and the initial voltage value are substituted into the jacobian matrix to obtain a coefficient matrix.
Illustratively, the initial value of each node voltage is brought into the following equation:
solving coefficient matrix of correction equation, i.e. each element of jacobian matrix
And +.>
Further, the correction equation is solved, and the variation of the voltage of each node, namely, the voltage correction value corresponding to the initial voltage value is solved>
Wherein (1)>
Is the real part of the voltage correction, +.>
Is the imaginary part of the voltage correction.
S130, correcting the initial voltage value based on the voltage correction value to obtain a target voltage value, and determining the power flow information of the power distribution network based on the target voltage value.
The target voltage value refers to a voltage value obtained by correcting the initial voltage value.
Specifically, after the voltage correction value is obtained, the initial voltage value can be corrected by the voltage correction value, and a specific correction mode may be that the initial voltage value and the voltage correction value are added to obtain a new target voltage value, and the power flow calculation of the power distribution network is performed according to the target voltage value.
Illustratively, a new value of each node voltage, i.e., a target voltage value, is calculated:
wherein,,
is the real part of the new value of the voltage, +.>
Is the imaginary part of the new value of the voltage.
On the basis of the above technical solution, the correcting the initial voltage value based on the voltage correction value to obtain a target voltage value, and determining the power flow information of the power distribution network based on the target voltage value includes: if the voltage correction value is smaller than a preset value, correcting the initial voltage value based on the voltage correction value so as to determine the corrected initial voltage value as the target voltage value; and calculating the active power, the reactive power and the network loss rate of the power distribution network based on the target voltage value.
The preset value may be a preset voltage value.
Specifically, after the voltage correction value is obtained, if the voltage correction value is smaller than a preset value and the representing error is smaller, the initial voltage value can be corrected based on the voltage correction value to obtain a target voltage value; further, the active power, the reactive power and the loss rate of the power distribution network are calculated through the target voltage value.
On the basis of the above technical solution, the correcting the initial voltage value based on the voltage correction value to obtain a target voltage value, and determining the power flow information of the power distribution network based on the target voltage value, further includes: and if the voltage correction value is larger than a preset value, updating the initial voltage value based on the voltage correction value, repeatedly determining the voltage correction value corresponding to the updated initial voltage value, and determining the updated initial voltage value as a target voltage value until the voltage correction value is smaller than a preset threshold value.
Specifically, if the voltage correction value is greater than the preset value, the error is larger, the initial voltage value may be corrected based on the voltage correction value, and the initial voltage value and the voltage correction value may be added to obtain a new voltage value as a new initial voltage value. Further, substituting the new initial voltage value into the correction equation, solving the unbalance amount and the coefficient matrix, solving the equation, finally obtaining a new voltage correction value, judging whether the new voltage correction value is larger than a preset value, and if so, continuing to repeat the process. And if the voltage value is smaller than the initial voltage value, correcting the initial voltage value through the new voltage correction value to obtain a target voltage value.
In practical application, a power distribution network model database can be established by reading public information model (Common Information Mode, CIM) model data of the power distribution network, analyzing information such as network frame topology, operation parameters, equipment parameters and the like; when the power flow calculation is needed to be carried out on the power distribution network, the data in the power distribution network model database can be directly obtained, the power flow calculation of the power distribution network is further automatically carried out, and a corresponding calculation result is output. In the process, the steps of manual participation can be reduced, the automatic power flow calculation of the power distribution network is realized, the calculation result has higher precision compared with manual work, and the auxiliary decision-making functions such as reliability calculation and the like are provided for the power distribution network.
It should be further noted that the system operation state variable represented in the power flow equation is the injected active power P i Reactive power Q i Sum node voltage phasors
The power grid of n nodes has 4n variables, but only 2n power equations, and therefore 2n operating state variables must be given. Depending on the variables of a given node, there may be three types of nodes.
PV node: active power P (of voltage control bus) i And voltage amplitude U i Given as such. This type of node corresponds to a generator bus node or to a substation bus equipped with a regulator or a static compensator.
Active power P injection at PQ node i And reactive power Q i Is given. Corresponding to a load node in an actual power system, or a generator bus for a given active and reactive power.
Balance node: to balance the power of the full grid. Voltage amplitude P of balance node i And phase angle delta i Given, its phase angle is usually taken as a reference point, i.e. its voltage phase angle is taken to be zero. Only one balance node is arranged in an independent power network.
Based on the above, a model dedicated to load flow calculation may be designed for the scheme of the embodiment of the present invention. Next, general input parameters of the present calculation model will be described with reference to tables 1, 2, 3, and 4
Table 1 is a parameter table required for a two-coil transformer, table 2 is a parameter table required for a three-coil transformer, table 3 is a wire input parameter table, and table 4 is a node parameter table.
TABLE 1
TABLE 2
TABLE 3 Table 3
TABLE 4 Table 4
| Node name | Node voltage initial value (per unit value) | Node type |
| 1.05 |
The node type is determined by an algorithm according to the result of line topology analysis through the following rules:
PQ node: the PQ node is a node with known nodes for injecting active power P and reactive power Q, and a power substation bus, a load node and a power plant bus with fixed output, which are not connected with power generation equipment generally according to the characteristics, can be used as the PQ node, and the nodes account for the majority in an algorithm.
PV node: the PV node is a node with known nodes injected with an active P and a voltage value U, is a power plant bus with sufficient reactive power reserve and a substation bus with a certain reactive power source, and is very few in a power system, so the PV node is basically not used in calculation.
Balance node: knowing the phase angle delta of the voltage value U, only one node of the injection power P and Q is required to be calculated, and the selection of the balance node in the algorithm is divided into two cases: for primary wiring in a high-voltage transformer substation, a line outlet switch of a feeder line is usually taken; when the high-voltage transformer substation is connected in a station for one time, the balance node takes the high-voltage bus in the station.
Next, the output parameters will be described:
table 5 shows the power flow distribution output parameter table, and Table 6 shows the node voltage parameter table
TABLE 5
TABLE 6
| Name of the name | Voltage (per unit value) | Node type | Phase angle | Voltage (kV) |
According to the technical scheme, admittance information of each branch in a circuit equivalent model of the power distribution network is determined based on the parameter information of the power distribution network; the parameter information comprises transformation ratio information and impedance information of the transformer; determining a voltage correction value corresponding to the initial voltage value based on admittance information of each branch, the initial voltage value of the power distribution network and a correction equation; the initial voltage value is corrected based on the voltage correction value to obtain a target voltage value, and the power flow information of the power distribution network is determined based on the target voltage value, so that the problems of large workload and low efficiency of the current power flow calculation of the power distribution network through manual analysis are solved, the automatic power flow calculation of the power distribution network is realized, and the calculation accuracy is improved.
Example two
Fig. 5 is a topology connection diagram of a power flow applicable to a second embodiment of the present invention, and the second embodiment of the present invention is a power flow calculation method applied to a power distribution network, where the present embodiment is a preferred embodiment of the foregoing embodiment, and a specific implementation manner of the present embodiment may refer to a technical solution of the present embodiment. Wherein, the technical terms identical to or corresponding to the above embodiments are not repeated herein.
In the embodiment of the present invention, parameters of the transformer may be referred to in table 7, parameters of the wire may be referred to in table 8, and parameters of the wire may be referred to in table 9.
TABLE 7
TABLE 8
| Length (kM) | Resistance per unit length (omega/kM) | Reactance unit (omega/kM) |
| 1 | 0.132 | 0.368 |
TABLE 9
In an embodiment of the present invention, a simplified equivalent circuit diagram may be seen in figure 6,
calculating the equivalent circuit impedance of the transformer according to the nameplate parameters (short-circuit loss and short-circuit voltage) of the transformer:
Z T ＝R T +jX T ＝0.002427+j0.009338
the corresponding ideal transformer transformation ratio is:
the corresponding pi-type equivalent circuit branch parameters are as follows:
calculating line impedance from the line parameters:
R L ＝0.132X L ＝0.368
the line branch admittance is:
Y L ＝0.8636+j2.4076
forming a node admittance matrix according to known parameters:
setting a node voltage initial value:
substituting the calculated unbalance amount into the correction equation with reference to the given active, reactive and voltage.
And carrying out iterative calculation according to an iterative formula, wherein the results are shown in a table 10 and a table 11, the table 10 is the power flow distribution, and the table 11 is the node voltage.
Table 10
TABLE 11
| Name of the name | Voltage (per unit value) | Node type | Phase angle | Voltage (kV) |
| 10kV bus | 1.05 | Load node | 0 | 10.5 |
| High-voltage side of transformer | 1.0486 | Load node | -0.1 | 10.486 |
| Low voltage side of transformer | 1.0479 | Load node | -0.2 | 0.398 |
Example III
Fig. 7 is a schematic structural diagram of a power flow calculation device applied to a power distribution network according to a third embodiment of the present invention. As shown in fig. 7, the apparatus includes:
an admittance information determining module 310, configured to determine admittance information of each branch in a circuit equivalent model of a power distribution network based on parameter information of the power distribution network; the parameter information comprises transformation ratio information and impedance information of the transformer;
the voltage correction value determining module 320 is configured to determine a voltage correction value corresponding to the initial voltage value based on admittance information of each branch, the initial voltage value of the power distribution network, and a correction equation;
the power flow information calculation module 330 is configured to correct the initial voltage value based on the voltage correction value to obtain a target voltage value, and determine power flow information of the power distribution network based on the target voltage value.
Optionally, the admittance information determining module 310 includes:
the circuit equivalent module is used for equivalent converting the power distribution network into a pi-type circuit diagram, wherein the pi-type circuit diagram comprises at least one branch;
and the matrix building module is used for calculating admittance values in all branches in the pi-type circuit diagram based on the transformation ratio information and the impedance information of the transformer, and building an admittance matrix of the power distribution network based on the admittance values of all the branches.
Optionally, the voltage correction value determining module 320 includes:
the admittance virtual real part determining module is used for determining an admittance real part value and an admittance imaginary part value corresponding to the admittance matrix based on the admittance matrix;
the unbalance amount calculation module is used for substituting the initial voltage value, the real part value of the admittance, the imaginary part value of the admittance and the preset power value into the correction equation to determine the unbalance amount of the correction equation;
wherein the unbalance amount includes an active power unbalance amount, a reactive power unbalance amount, and a voltage unbalance amount.
Optionally, the voltage correction value determining module 320 includes:
a coefficient matrix determining module for determining a coefficient matrix of the correction equation based on the unbalance amount of the correction equation and the initial voltage value;
and the equation solving module is used for solving the correction equation based on the coefficient matrix to obtain a voltage correction value corresponding to the initial voltage value.
Optionally, the coefficient matrix determining module includes:
and the coefficient matrix determining unit is used for establishing a jacobian matrix corresponding to the correction equation, and substituting each unbalance amount and the initial voltage value into the jacobian matrix to obtain the coefficient matrix of the correction equation.
Optionally, the power flow information calculating module 330 includes:
the target voltage value calculation module is used for correcting the initial voltage value based on the voltage correction value if the voltage correction value is smaller than a preset value, so as to determine the corrected initial voltage value as the target voltage value;
and the power calculation module is used for calculating the active power, the reactive power and the loss rate of the power distribution network based on the target voltage value.
Optionally, the power flow information calculation module 330 further includes:
and the updating module is used for updating the initial voltage value based on the voltage correction value if the voltage correction value is larger than a preset value, repeatedly determining the voltage correction value corresponding to the updated initial voltage value until the voltage correction value is smaller than a preset threshold value, and determining the updated initial voltage value as a target voltage value.
The power flow calculation device applied to the power distribution network provided by the embodiment of the invention can execute the power flow calculation method applied to the power distribution network provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
Example IV
Fig. 8 is a schematic structural diagram of an electronic device according to a fourth embodiment of the present invention. Electronic devices are intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. Electronic equipment may also represent various forms of mobile devices, such as personal digital processing, cellular telephones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the inventions described and/or claimed herein.
As shown in fig. 8, the electronic device 10 includes at least one processor 11, and a memory, such as a Read Only Memory (ROM) 12, a Random Access Memory (RAM) 13, etc., communicatively connected to the at least one processor 11, in which the memory stores a computer program executable by the at least one processor, and the processor 11 may perform various appropriate actions and processes according to the computer program stored in the Read Only Memory (ROM) 12 or the computer program loaded from the storage unit 18 into the Random Access Memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 may also be stored. The processor 11, the ROM 12 and the RAM 13 are connected to each other via a bus 14. An input/output (I/O) interface 15 is also connected to bus 14.
Various components in the electronic device 10 are connected to the I/O interface 15, including: an input unit 16 such as a keyboard, a mouse, etc.; an output unit 17 such as various types of displays, speakers, and the like; a storage unit 18 such as a magnetic disk, an optical disk, or the like; and a communication unit 19 such as a network card, modem, wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information/data with other devices via a computer network, such as the internet, and/or various telecommunication networks.
The processor 11 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various processors running machine learning model algorithms, digital Signal Processors (DSPs), and any suitable processor, controller, microcontroller, etc. The processor 11 performs the various methods and processes described above, for example a power flow calculation method applied to a power distribution network.
In some embodiments, the power flow calculation method applied to the power distribution network may be implemented as a computer program, which is tangibly embodied in a computer-readable storage medium, such as the storage unit 18. In some embodiments, part or all of the computer program may be loaded and/or installed onto the electronic device 10 via the ROM 12 and/or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more of the steps of the power flow calculation method described above applied to the power distribution network may be performed. Alternatively, in other embodiments, the processor 11 may be configured to perform the power flow calculation method applied to the power distribution network in any other suitable way (e.g. by means of firmware).
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuit systems, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), systems On Chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs, the one or more computer programs may be executed and/or interpreted on a programmable system including at least one programmable processor, which may be a special purpose or general-purpose programmable processor, that may receive data and instructions from, and transmit data and instructions to, a storage system, at least one input device, and at least one output device.
A computer program for carrying out methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be implemented. The computer program may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, 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.
To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) through which a user can provide input to the electronic device. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic input, speech input, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a background component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such background, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), blockchain networks, and the internet.
The computing system may include clients and servers. The client and server are typically remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical hosts and VPS service are overcome.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides a power flow calculation method applied to a power distribution network, which is characterized by comprising the following steps:
determining admittance information of each branch in a circuit equivalent model of the power distribution network based on parameter information of the power distribution network; the parameter information comprises transformation ratio information and impedance information of the transformer;
determining a voltage correction value corresponding to the initial voltage value based on admittance information of each branch, the initial voltage value of the power distribution network and a correction equation;
and correcting the initial voltage value based on the voltage correction value to obtain a target voltage value, and determining the power flow information of the power distribution network based on the target voltage value.
2. The method according to claim 1, wherein determining admittance information of each branch in the circuit equivalent model of the power distribution network based on parameter information of the power distribution network comprises:
equivalent the distribution network to a pi-type circuit diagram, wherein the pi-type circuit diagram comprises at least one branch;
and calculating admittance values in all branches in the pi-type circuit diagram based on the transformation ratio information and the impedance information of the transformer, and establishing an admittance matrix of the power distribution network based on the admittance values of all branches.
3. The method according to claim 2, wherein determining the voltage correction value corresponding to the initial voltage value based on admittance information of each of the branches, the initial voltage value of the power distribution network, and a correction equation includes:
determining an admittance real part value and an admittance imaginary part value corresponding to the admittance matrix based on the admittance matrix;
substituting the initial voltage value, the real part value of the admittance, the imaginary part value of the admittance and the preset power value into the correction equation to determine the unbalance amount of the correction equation;
wherein the unbalance amount includes an active power unbalance amount, a reactive power unbalance amount, and a voltage unbalance amount.
4. A method according to claim 3, wherein determining the voltage correction value corresponding to the initial voltage value based on admittance information of each of the branches, the initial voltage value of the power distribution network, and a correction equation comprises:
determining a coefficient matrix of the correction equation based on the unbalance amount of the correction equation and the initial voltage value;
and solving the correction equation based on the coefficient matrix to obtain a voltage correction value corresponding to the initial voltage value.
5. The method of claim 4, wherein the determining the coefficient matrix of the correction equation based on the unbalance amount of the correction equation and the initial voltage value comprises:
and establishing a jacobian matrix corresponding to the correction equation, and substituting each unbalance amount and the initial voltage value into the jacobian matrix to obtain a coefficient matrix of the correction equation.
6. The method according to claim 1, wherein said correcting the initial voltage value based on the voltage correction value to obtain a target voltage value, and determining the power flow information of the power distribution network based on the target voltage value, comprises:
if the voltage correction value is smaller than a preset value, correcting the initial voltage value based on the voltage correction value so as to determine the corrected initial voltage value as the target voltage value;
and calculating the active power, the reactive power and the network loss rate of the power distribution network based on the target voltage value.
7. The method of claim 1, wherein the correcting the initial voltage value based on the voltage correction value to obtain a target voltage value, and determining the power flow information of the power distribution network based on the target voltage value, further comprises:
and if the voltage correction value is larger than a preset value, updating the initial voltage value based on the voltage correction value, repeatedly determining the voltage correction value corresponding to the updated initial voltage value, and determining the updated initial voltage value as a target voltage value until the voltage correction value is smaller than a preset threshold value.
8. A power flow calculation device applied to a power distribution network, comprising:
the admittance information determining module is used for determining admittance information of each branch in a circuit equivalent model of the power distribution network based on parameter information of the power distribution network; the parameter information comprises transformation ratio information and impedance information of the transformer;
the voltage correction value determining module is used for determining a voltage correction value corresponding to the initial voltage value based on admittance information of each branch, the initial voltage value of the power distribution network and a correction equation;
and the power flow information calculation module is used for correcting the initial voltage value based on the voltage correction value to obtain a target voltage value, and determining the power flow information of the power distribution network based on the target voltage value.
9. An electronic device, the electronic device comprising:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the power flow calculation method of any one of claims 1-7 for application to a power distribution network.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores computer instructions for causing a processor to implement the load flow calculation method applied to a power distribution network according to any one of claims 1-7 when executed.
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