CN114336634A - Load flow calculation method, device and equipment of power grid system - Google Patents
Load flow calculation method, device and equipment of power grid system Download PDFInfo
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Abstract
The invention discloses a load flow calculation method, a load flow calculation device and load flow calculation equipment of a power grid system, wherein the method comprises the following steps: selecting a target load flow calculation type from a plurality of preset load flow calculation types in response to a selection instruction input by any client; acquiring corresponding input data according to the target load flow calculation type; carrying out load flow calculation by adopting input data to generate a load flow calculation result; and returning the load flow calculation result to the client, and adjusting and optimizing the power grid system through the client according to the load flow calculation result. Therefore, through diversified power flow calculation, the adjustment and optimization of the power grid system can be more efficiently and flexibly realized.
Description
Technical Field
The invention relates to the technical field of power grid system optimization, in particular to a load flow calculation method, device and equipment of a power grid system.
Background
The electric network system is an electric energy production and consumption system composed of power plant, transmission and transformation circuit, power supply and distribution station and electricity consumption, and its function is to convert the natural primary energy into electric energy by the power generation device, and then supply the electric energy to each user through transmission, transformation and distribution.
The existing load flow calculation method is mainly used for setting switching states and operation data of power grid equipment on a power grid model according to requirements of users to carry out load flow calculation, so that the users can study the distribution change of the power grid load flow. However, in the above scheme, because the power grid model needs to be repeatedly constructed, the power grid system cannot be flexibly adjusted, and the flexibility of the load flow calculation is reduced.
Disclosure of Invention
The invention provides a method, a device and equipment for calculating power flow of a power grid system, and solves the technical problem that the flexibility of power flow calculation is reduced because a power grid model needs to be repeatedly constructed and the power grid system cannot be flexibly adjusted in the conventional scheme.
The invention provides a power flow calculation method of a power grid system, which comprises the following steps:
selecting a target load flow calculation type from a plurality of preset load flow calculation types in response to a selection instruction input by any client;
acquiring corresponding input data according to the target load flow calculation type;
performing load flow calculation by adopting the input data to generate a load flow calculation result;
returning the load flow calculation result to the client; and the client is used for adjusting the power grid system according to the load flow calculation result.
Optionally, the multiple load flow calculation types include a basic load flow calculation type, an online load flow calculation type, an offline load flow calculation type and an optimal load flow calculation type; the step of obtaining corresponding input data according to the target load flow calculation type comprises the following steps:
when the target load flow calculation type is the basic load flow calculation type, acquiring system parameters, a topological connection relation, load node input power and bus voltage of the power grid system as input data;
when the target load flow calculation type is the online load flow calculation type, acquiring a real-time power grid section of the power grid system as input data;
when the target load flow calculation type is the offline load flow calculation type, acquiring switching state and operation data input by the client and aiming at power grid equipment in the power grid system as input data;
and when the target load flow calculation type is the optimal load flow calculation type, acquiring a static operation condition and a control variable corresponding to the power grid system as input data.
Optionally, when the target load flow calculation type is the basic load flow calculation type, the step of performing load flow calculation by using the input data to generate a load flow calculation result includes:
calculating a voltage amplitude and a phase angle corresponding to each bus of the power grid system by adopting system parameters of the power grid system, the topological connection relation, the load node input power and the bus voltage;
calculating active power and reactive power of each branch of the power grid system in the calculation range according to preset power flow convergence precision, maximum convergence times and the calculation range;
and generating a load flow calculation result by adopting the voltage amplitude, the phase angle, the active power and the reactive power.
Optionally, when the target load flow calculation type is the online load flow calculation type, the step of performing load flow calculation by using the input data to generate a load flow calculation result includes:
calculating the power grid running state corresponding to the power grid system by adopting online state estimation and combining with the real-time power grid section; the power grid running state comprises the voltage of each bus, the power distribution in the network, the generated output, the total load sum and the power loss;
and generating a load flow calculation result by adopting the power grid operation state.
Optionally, when the target load flow calculation type is the offline load flow calculation type, the offline load flow calculation type includes a real-time mode and a research mode; the step of adopting the input data to carry out load flow calculation and generating a load flow calculation result comprises the following steps:
if the power grid system is in the real-time mode, adjusting a real-time operation section corresponding to the power grid system based on each switching state and each operation data, performing load flow calculation, and generating a first load flow calculation result;
and if the power grid is in the research mode, performing load flow calculation according to a preset historical power grid model and the operation data to generate a second load flow calculation result.
Optionally, the control variable comprises a plurality of control sub-variables; when the target load flow calculation type is the optimal load flow calculation type, the step of adopting the input data to perform load flow calculation and generating a load flow calculation result comprises the following steps:
responding to a target function selection instruction input by the client, and selecting a target optimization function under the static operation condition;
selecting a target control variable from the multiple control sub-variables according to the target optimization function;
and adjusting the target control variable according to a preset adjusting gradient so as to minimize the target optimization function.
Optionally, the method further comprises:
when a model selecting instruction is received at a preset main control interface, selecting a target power grid model and an initial operation mode and jumping to a parameter setting page;
responding to a parameter setting instruction received on the parameter setting page, and determining target operation parameters;
establishing a power grid system according to the target operation parameters;
and after the load flow calculation result is generated, displaying the load flow calculation result on a current interface.
The second aspect of the present invention provides a power flow calculation apparatus for a power grid system, including:
the load flow calculation type selection module is used for responding to a selection instruction input by any client and selecting a target load flow calculation type from a plurality of preset load flow calculation types;
the input data acquisition module is used for acquiring corresponding input data according to the target load flow calculation type;
the load flow calculation module is used for carrying out load flow calculation by adopting the input data to generate a load flow calculation result;
the load flow calculation result returning module is used for returning the load flow calculation result to the client; and the client is used for adjusting the power grid system according to the load flow calculation result.
Optionally, the apparatus further comprises:
the operation selection module is used for selecting a target power grid model and an initial operation mode and jumping to a parameter setting page when a model selection instruction is received at a preset main control interface;
the operation parameter selection module is used for responding to a parameter setting instruction received on the parameter setting page and determining a target operation parameter;
the power grid system creating module is used for creating a power grid system according to the target operation parameters;
and the load flow calculation result display module is used for displaying the load flow calculation result on the current interface after the load flow calculation result is generated.
A third aspect of the present invention provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and the computer program, when executed by the processor, causes the processor to execute the steps of the power flow calculation method of the power grid system according to any one of the first aspect of the present invention.
According to the technical scheme, the invention has the following advantages:
according to the method, a target load flow calculation type is selected from a plurality of preset load flow calculation types by responding to a selection instruction input by any client; acquiring corresponding input data according to the target load flow calculation type; carrying out load flow calculation by adopting input data to generate a load flow calculation result; and returning the load flow calculation result to the client, and adjusting and optimizing the power grid system through the client according to the load flow calculation result. Therefore, through diversified power flow calculation, the adjustment and optimization of the power grid system can be more efficiently and flexibly realized.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a flowchart illustrating steps of a method for calculating a power flow of a network system according to an embodiment of the present invention;
fig. 2 is a schematic view of a power flow calculation according to an embodiment of the present invention;
fig. 3 is a block diagram of a power flow calculation device of a network system according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a method, a device and equipment for calculating a power flow of a power grid system, which are used for solving the technical problem that the flexibility of power flow calculation is reduced because a power grid model needs to be repeatedly constructed and the power grid system cannot be flexibly adjusted in the conventional scheme.
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a flowchart illustrating steps of a method for calculating a power flow of a network system according to an embodiment of the present invention.
The invention provides a load flow calculation method of a power grid system, which comprises the following steps:
the term of load flow calculation and electromechanics refers to the calculation of the distribution of active power, reactive power and voltage in the power network under the conditions of given power system network topology, element parameters, power generation parameters and load parameters. The tidal current calculation is a calculation for determining steady-state operation state parameters of each part of the power system according to the given power grid structure, parameters and operation conditions of elements such as a generator and a load.
In the embodiment of the invention, the target load flow calculation type is selected from a plurality of load flow calculation types by responding to a selection instruction input by any client. The multiple power flow calculation types may include, but are not limited to, a basic power flow calculation type, an online power flow calculation type, an offline power flow calculation type, and an optimal power flow calculation type. In the concrete implementation, the load flow calculation module can be represented in the form of a basic load flow calculation module, an online load flow calculation module, an offline load flow calculation module and an optimal load flow calculation module.
102, acquiring corresponding input data according to the target load flow calculation type;
optionally, the multiple load flow calculation types include a basic load flow calculation type, an online load flow calculation type, an offline load flow calculation type and an optimal load flow calculation type; step 102 may include the following sub-steps:
when the target load flow calculation type is the basic load flow calculation type, acquiring system parameters, a topological connection relation, load node input power and bus voltage of the power grid system as input data;
when the target load flow calculation type is the online load flow calculation type, acquiring a real-time power grid section of the power grid system as input data;
when the target load flow calculation type is the offline load flow calculation type, acquiring switching state and operation data input by the client and aiming at power grid equipment in the power grid system as input data;
and when the target load flow calculation type is the optimal load flow calculation type, acquiring a static operation condition and a control variable corresponding to the power grid system as input data.
In the embodiment of the invention, the basic load flow calculation module can obtain the load node PQ and the generator node PV, set the load flow convergence precision and the maximum convergence times, and set parameters such as the calculation range of load flow calculation in a line-by-line manner, a regional manner or a whole network manner as input data. The online power flow calculation module can obtain reference nodes of each electric island, obtain distribution modes and distribution coefficients of unbalanced power, set load nodes PQ, generator nodes PV and balance nodes, obtain power flow convergence accuracy and maximum convergence times, and set parameters such as a heavy load rate limit value as input data. When the target load flow calculation type is the offline load flow calculation type, acquiring switching state and operation data input by the client and aiming at power grid equipment in the power grid system as input data; and when the target load flow calculation type is the optimal load flow calculation type, acquiring a static operation condition and a control variable corresponding to the power grid system as input data.
In particular implementations, the input data may include, but is not limited to, the following types: the method comprises the steps of obtaining parameter data such as the static topological connection relation of equipment, impedance, capacity and limit value of various kinds of equipment of a distribution network, and obtaining an initial operation mode, bus voltage, various kinds of power of the distribution network, the operation state of the equipment and the on/off state of a breaker/disconnecting link from state estimation or CASE management.
103, carrying out load flow calculation by adopting the input data to generate a load flow calculation result;
the load flow calculation can be mathematically reduced to solve a nonlinear equation set, and a mathematical model of the load flow calculation is abbreviated as follows:
f (x) ═ 0 is a nonlinear system of equations in which:
f ═ T (F1, F2........, fn) is the node balance equation;
x ═ T (X1, X2........ times.xn) is the voltage of each node to be solved.
Optionally, when the target power flow calculation type is the base power flow calculation type, step 103 may include the following sub-steps:
calculating a voltage amplitude and a phase angle corresponding to each bus of the power grid system by adopting system parameters of the power grid system, the topological connection relation, the load node input power and the bus voltage;
calculating active power and reactive power of each branch of the power grid system in the calculation range according to preset power flow convergence precision, maximum convergence times and the calculation range;
and generating a load flow calculation result by adopting the voltage amplitude, the phase angle, the active power and the reactive power.
In the embodiment of the invention, the system parameters of the power grid system, the topological connection relation, the load node input power and the bus voltage are adopted to calculate the voltage amplitude and the phase angle corresponding to each bus of the power grid system; calculating active power and reactive power of each branch of the power grid system in the calculation range according to preset power flow convergence precision, maximum convergence times and the calculation range; generating a load flow calculation result by using the voltage amplitude, the phase angle, the active power and the reactive power
In a specific implementation, the functions of the basic power flow calculation module corresponding to the basic power flow calculation type include: a) and a mature, efficient and practical power flow algorithm is adopted, so that the convergence and the real-time performance of calculation are ensured. And load flow calculation of various load calculation models is supported, wherein the load flow calculation models comprise constant current, constant capacity, constant active power and the like. b) The method can support calculation of a sub-line, a sub-area and a full distribution network. c) And when the load flow calculation is not converged, providing calculation iteration information for a user to diagnose the reason of the non-convergence. d) The method has the advantages that accurate load flow calculation can be carried out on the distribution automation coverage area due to complete real-time data acquisition, and load flow estimation can be carried out on the area which is not covered or is not covered completely by automation by utilizing the quasi-real-time data of the metering automation system and utilizing state estimation to complement the data as much as possible. e) And providing a load flow calculation result comparison function of multiple data sections. f) And (4) prompting an alarm according to a load flow calculation result, and prompting out-of-limit alarm information according to a line thermal stability limit value (the maximum load can be carried) and a bus voltage limit value. g) And a single-phase/three-phase power flow calculation function is supported.
Furthermore, network loss calculation is carried out during statistical assessment, such as loss calculation and statistics of systems, regions and equipment, practical operation indexes of online load flow analysis are calculated, and annual, monthly and daily operation indexes are analyzed and counted.
And on the other hand, the provided human-computer interface is used for controlling the starting of the on-line power flow analysis, setting calculation parameters and checking calculation results and statistical index information.
Optionally, when the target power flow calculation type is the online power flow calculation type, step 103 may include the following sub-steps:
calculating the power grid running state corresponding to the power grid system by adopting online state estimation and combining with the real-time power grid section; the power grid running state comprises the voltage of each bus, the power distribution in the network, the generated output, the total load sum and the power loss;
and generating a load flow calculation result by adopting the power grid operation state.
In a specific implementation, the power grid operation state corresponding to the power grid system can be calculated by inputting and adopting online state estimation and combining the real-time power grid section; the power grid running state comprises the voltage of each bus, the power distribution in the network, the generated output, the total load sum and the power loss; and generating a load flow calculation result by adopting the power grid operation state.
In another example of the present invention, according to the power grid model parameters, the topological connection relationship, the given PQ injection power and the PV bus voltage, the voltage amplitude and the phase angle of each bus are solved, and the active power and the reactive power of each branch of the whole grid are calculated, and the functions include: a) a mature, efficient and practical power flow algorithm is adopted, and the convergence and the real-time performance of calculation are guaranteed; at least two algorithms of quick decoupling and Newton-Raphson are required, and the algorithm can be manually selected or automatically switched according to the iteration condition. b) And the load flow calculation of a plurality of electric islands is supported, and the load flow calculation of an alternating current-direct current hybrid system is supported (optional). c) Supporting the establishment of a buffer network to improve the convergence rate and accuracy of load flow calculation, wherein a buffer network model and operation data can be automatically acquired from a superior system or an adjacent power grid system; d) and a voltage control calculation function of controlling the junction bus voltage by using the generator is supported. e) The model and data after model splicing are supported to realize load flow calculation of the whole network, and the model and data of the local power grid can be directly adopted to carry out corresponding calculation analysis. f) The unbalanced power is adjusted to the relevant units according to the distribution coefficient, so that the power flow of the power grid is more in line with the actual situation. g) And when the load flow calculation is not converged, providing calculation iteration information for a user to diagnose the reason of the non-convergence. h) And prompting out-of-limit alarm information according to the transmission section limit, the equipment thermal stability limit and the bus voltage limit. i) And providing a load flow calculation result comparison function of multiple data sections. j) The method supports the basic state load flow calculation of the automatic cycle, can automatically alarm according to the out-of-limit condition, and can set the number of out-of-limit devices and the maximum out-of-limit proportion on the alarm threshold. k) The method supports the promotion of events such as line tripping, switch deflection and the like in a selected range, automatically starts a load flow calculation function, can automatically alarm according to the out-of-limit condition, and can set the number of out-of-limit equipment and the maximum out-of-limit proportion on an alarm threshold. l) carrying out unbalanced power by the units and loads of the whole network according to the frequency characteristics, and calculating the frequency. m) has the calculation function of single-end charging of the line, and gives the voltage and the charging power at two ends of the line. n) providing a dynamic topological tree picture, designating a station (or a bus) by a user to form a topological connection relation tree consisting of the station (or the bus), the connected stations (or the bus) and the connected equipment, and displaying tidal current calculation values of voltage, power and the like on the bus and the equipment, thereby facilitating a user to analyze the power grid tidal current distribution of a local area.
Optionally, when the target load flow calculation type is the offline load flow calculation type, the offline load flow calculation type includes a real-time mode and a research mode; step 103 may comprise the following sub-steps:
if the power grid system is in the real-time mode, adjusting a real-time operation section corresponding to the power grid system based on each switching state and each operation data, performing load flow calculation, and generating a first load flow calculation result;
and if the power grid is in the research mode, performing load flow calculation according to a preset historical power grid model and the operation data to generate a second load flow calculation result.
In the embodiment of the invention, if the power grid system is in the real-time mode, the real-time operation section corresponding to the power grid system is adjusted based on each switching state and each operation data, load flow calculation is carried out, and a first load flow calculation result is generated. For example
And if the power grid is in the research mode, performing load flow calculation according to a preset historical power grid model and the operation data to generate a second load flow calculation result. The historical power grid model comprises power grid models respectively constructed at historical time and future time, so that generation and modification of various running modes such as real-time running mode, future running mode and historical running mode are configured for load flow calculation. For example, the grid operation mode data such as bus voltage, unit/load power, line/transformer power, transformer tap position, current, frequency, etc. are input; and the on/off electric network running state data of the circuit breaker (switch)/disconnecting switch (disconnecting link). The dispatcher load flow sends operation indexes of the dispatcher load flow to operation analysis and evaluation, wherein the operation indexes comprise the monthly qualification rate of the dispatcher load flow and dispatcher load flow calculation result errors; and (5) calculating time and other index data of the single load flow. Or 1) an active power predicted value of system/bus load prediction; 2) the active power plan value of the power plant/unit power generation plan; 3) a tie line exchange plan; 4) equipment commissioning/decommissioning status of the equipment service plan.
Optionally, the control variable comprises a plurality of control sub-variables; when the target power flow calculation type is the optimal power flow calculation type, step 103 may include the following sub-steps:
responding to a target function selection instruction input by the client, and selecting a target optimization function under the static operation condition;
selecting a target control variable from the multiple control sub-variables according to the target optimization function;
and adjusting the target control variable according to a preset adjusting gradient so as to minimize the target optimization function.
In a specific implementation, a target function optimization function under the static operation condition is selected in response to a target function selection instruction input by the client; selecting a target control variable from the multiple control sub-variables according to the target optimization function; and adjusting the target control variable according to a preset adjusting gradient so as to minimize the target optimization function.
In the embodiment of the invention, the limit values of all the control variables can be adjusted. The role and control order of certain control variables can also be freely specified. These control variables can be freely combined to accommodate different optimization problems, and the types of control sub-variables can include, but are not limited to: 1) adjustable bus voltage amplitude; 2) the active power of the unit; 3) the reactive power of the unit; 4) a transformer tap; 5) the reactive power of a phase modulator; 6) a capacitor/reactor bank; 7) exchange power with other grid companies; 8) controlling the load; 9) a camera-shifting machine is tapped; 10) and (4) direct current control. And (3) constraint: a) the limits of all constraints can be freely adjusted. For different optimization objectives, the constraint conditions are represented by different combinations of these constraint variables as follows. The constraint condition can be assigned to a certain device or a certain type of device; b) whether the constraint participates in the calculation can be manually specified; c) at least these constraints are provided: 1) the active power limit value and the reactive power limit value of the unit; 2) active power limit for area switching; 3) standby of regional active power; 4) tap constraint of the on-load tap changer; 5) a branch tidal current limit; 6) the amplitude limit of the bus voltage; 7) phase shifter angle limit; 8) a stable cross-sectional limit.
Optionally, for the optimal power flow calculation module corresponding to the optimal power flow calculation type, the following performance requirements are also included: a) the scale of the optimal power flow is not less than: 50000 buses, 80000 branches and 100 electric active islands; b) the single optimal power flow calculation time is not more than 3 minutes; at least 5 users are supported to use simultaneously, and each user can use the functions of any mode.
In an example of the present invention, after obtaining the diversified power flow calculation results, the client may return the power flow calculation results to the client, and the client adjusts parameters such as the structure, the switching condition, the bus and the device voltage, the power, and the like of the power grid system according to the power flow calculation results, thereby further optimizing the power grid system.
Optionally, the method further comprises the steps of:
when a model selecting instruction is received at a preset main control interface, selecting a target power grid model and an initial operation mode and jumping to a parameter setting page;
responding to a parameter setting instruction received on the parameter setting page, and determining target operation parameters;
establishing a power grid system according to the target operation parameters;
and after the load flow calculation result is generated, displaying the load flow calculation result on a current interface.
In one example of the invention, when a model selecting instruction is received at a preset master control interface, a target power grid model and an initial operation mode are selected and a parameter setting page is skipped; responding to a parameter setting instruction received on the parameter setting page, and determining target operation parameters; establishing a power grid system according to the target operation parameters; and after the load flow calculation result is generated, displaying the load flow calculation result on a current interface.
Referring to fig. 2, in a specific implementation, a master control frame is provided for selecting a power grid model and an initial operation mode, and for manually starting a load flow calculation. And providing a parameter setting picture for modifying relevant parameters for controlling the load flow calculation, such as a load flow algorithm, a convergence criterion, the maximum iteration times, load model setting and the like. And a CASE management picture can be called to realize the operations of saving, recovering, deleting and the like of the current power flow section. The switch state, the power value of the load, the voltage value of the bus, and the feeder outlet voltage may be set on a single line diagram. And providing a load flow calculation result list on the current display interface, and supporting the comparison of results of two load flow sections. The load flow calculation result can be directly displayed on the single line diagram, a network loss information and out-of-limit information list is provided, the out-of-limit information can mark alarm information on the out-of-limit element of the single line diagram, and the positioning of users is facilitated. And providing a statistical assessment information picture, and displaying information such as monthly load flow service condition of a dispatcher, load flow calculation result error and the like. Whether the convergence is obvious or not and the calculation end time are displayed, and all the pictures can be printed and output according to requirements.
In the embodiment of the invention, a target load flow calculation type is selected from a plurality of preset load flow calculation types by responding to a selection instruction input by any client; acquiring corresponding input data according to the target load flow calculation type; carrying out load flow calculation by adopting input data to generate a load flow calculation result; and returning the load flow calculation result to the client, and adjusting and optimizing the power grid system through the client according to the load flow calculation result. Therefore, through diversified power flow calculation, the adjustment and optimization of the power grid system can be more efficiently and flexibly realized.
Referring to fig. 3, fig. 3 is a block diagram illustrating a structure of a power flow calculation device of a power grid system according to an embodiment of the present invention.
The embodiment of the invention provides a load flow calculation device of a power grid system, which comprises:
the load flow calculation type selection module 301 is used for responding to a selection instruction input by any client and selecting a target load flow calculation type from a plurality of preset load flow calculation types;
an input data obtaining module 302, configured to obtain corresponding input data according to the target load flow calculation type;
the load flow calculation module 303 is configured to perform load flow calculation by using the input data to generate a load flow calculation result;
a load flow calculation result returning module 304, configured to return the load flow calculation result to the client; and the client is used for adjusting the power grid system according to the load flow calculation result.
Optionally, the multiple load flow calculation types include a basic load flow calculation type, an online load flow calculation type, an offline load flow calculation type and an optimal load flow calculation type; the input data obtaining module 302 is specifically configured to:
when the target load flow calculation type is the basic load flow calculation type, acquiring system parameters, a topological connection relation, load node input power and bus voltage of the power grid system as input data;
when the target load flow calculation type is the online load flow calculation type, acquiring a real-time power grid section of the power grid system as input data;
when the target load flow calculation type is the offline load flow calculation type, acquiring switching state and operation data input by the client and aiming at power grid equipment in the power grid system as input data;
and when the target load flow calculation type is the optimal load flow calculation type, acquiring a static operation condition and a control variable corresponding to the power grid system as input data.
Optionally, when the target power flow calculation type is the basic power flow calculation type, the power flow calculation module 303 is specifically configured to:
calculating a voltage amplitude and a phase angle corresponding to each bus of the power grid system by adopting system parameters of the power grid system, the topological connection relation, the load node input power and the bus voltage;
calculating active power and reactive power of each branch of the power grid system in the calculation range according to preset power flow convergence precision, maximum convergence times and the calculation range;
and generating a load flow calculation result by adopting the voltage amplitude, the phase angle, the active power and the reactive power.
Optionally, when the target power flow calculation type is the online power flow calculation type, the power flow calculation module 303 is specifically configured to:
calculating the power grid running state corresponding to the power grid system by adopting online state estimation and combining with the real-time power grid section; the power grid running state comprises the voltage of each bus, the power distribution in the network, the generated output, the total load sum and the power loss;
and generating a load flow calculation result by adopting the power grid operation state.
Optionally, when the target load flow calculation type is the offline load flow calculation type, the offline load flow calculation type includes a real-time mode and a research mode; the power flow calculation module 303 is specifically configured to:
if the power grid system is in the real-time mode, adjusting a real-time operation section corresponding to the power grid system based on each switching state and each operation data, performing load flow calculation, and generating a first load flow calculation result;
and if the power grid is in the research mode, performing load flow calculation according to a preset historical power grid model and the operation data to generate a second load flow calculation result.
Optionally, the control variable comprises a plurality of control sub-variables; when the target load flow calculation type is the optimal load flow calculation type, the load flow calculation module 303 is specifically configured to:
responding to a target function selection instruction input by the client, and selecting a target optimization function under the static operation condition;
selecting a target control variable from the multiple control sub-variables according to the target optimization function;
and adjusting the target control variable according to a preset adjusting gradient so as to minimize the target optimization function.
Optionally, the apparatus further comprises:
the operation selection module is used for selecting a target power grid model and an initial operation mode and jumping to a parameter setting page when a model selection instruction is received at a preset main control interface;
the operation parameter selection module is used for responding to a parameter setting instruction received on the parameter setting page and determining a target operation parameter;
the power grid system creating module is used for creating a power grid system according to the target operation parameters;
and the load flow calculation result display module is used for displaying the load flow calculation result on the current interface after the load flow calculation result is generated.
An embodiment of the present invention further provides an electronic device, which includes a memory and a processor, where the memory stores a computer program, and when the computer program is executed by the processor, the processor is enabled to execute the steps of the power flow calculation method for a power grid system according to any embodiment of the present invention.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described apparatuses and modules may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A power flow calculation method of a power grid system is characterized by comprising the following steps:
selecting a target load flow calculation type from a plurality of preset load flow calculation types in response to a selection instruction input by any client;
acquiring corresponding input data according to the target load flow calculation type;
performing load flow calculation by adopting the input data to generate a load flow calculation result;
returning the load flow calculation result to the client; and the client is used for adjusting the power grid system according to the load flow calculation result.
2. The method of claim 1, wherein the plurality of load flow calculation types include a base load flow calculation type, an online load flow calculation type, an offline load flow calculation type, and an optimal load flow calculation type; the step of obtaining corresponding input data according to the target load flow calculation type comprises the following steps:
when the target load flow calculation type is the basic load flow calculation type, acquiring system parameters, a topological connection relation, load node input power and bus voltage of the power grid system as input data;
when the target load flow calculation type is the online load flow calculation type, acquiring a real-time power grid section of the power grid system as input data;
when the target load flow calculation type is the offline load flow calculation type, acquiring switching state and operation data input by the client and aiming at power grid equipment in the power grid system as input data;
and when the target load flow calculation type is the optimal load flow calculation type, acquiring a static operation condition and a control variable corresponding to the power grid system as input data.
3. The method according to claim 2, wherein when the target power flow calculation type is the basic power flow calculation type, the step of performing power flow calculation using the input data to generate a power flow calculation result comprises:
calculating a voltage amplitude and a phase angle corresponding to each bus of the power grid system by adopting system parameters of the power grid system, the topological connection relation, the load node input power and the bus voltage;
calculating active power and reactive power of each branch of the power grid system in the calculation range according to preset power flow convergence precision, maximum convergence times and the calculation range;
and generating a load flow calculation result by adopting the voltage amplitude, the phase angle, the active power and the reactive power.
4. The method according to claim 2, wherein when the target power flow calculation type is the online power flow calculation type, the step of performing power flow calculation using the input data to generate a power flow calculation result comprises:
calculating the power grid running state corresponding to the power grid system by adopting online state estimation and combining with the real-time power grid section; the power grid running state comprises the voltage of each bus, the power distribution in the network, the generated output, the total load sum and the power loss;
and generating a load flow calculation result by adopting the power grid operation state.
5. The method according to claim 2, wherein when the target power flow calculation type is the offline power flow calculation type, the offline power flow calculation type includes a real-time mode and a research mode; the step of adopting the input data to carry out load flow calculation and generating a load flow calculation result comprises the following steps:
if the power grid system is in the real-time mode, adjusting a real-time operation section corresponding to the power grid system based on each switching state and each operation data, performing load flow calculation, and generating a first load flow calculation result;
and if the power grid is in the research mode, performing load flow calculation according to a preset historical power grid model and the operation data to generate a second load flow calculation result.
6. The method of claim 2, wherein the control variable comprises a plurality of control sub-variables; when the target load flow calculation type is the optimal load flow calculation type, the step of adopting the input data to perform load flow calculation and generating a load flow calculation result comprises the following steps:
responding to a target function selection instruction input by the client, and selecting a target optimization function under the static operation condition;
selecting a target control variable from the multiple control sub-variables according to the target optimization function;
and adjusting the target control variable according to a preset adjusting gradient so as to minimize the target optimization function.
7. The method of claim 1, further comprising:
when a model selecting instruction is received at a preset main control interface, selecting a target power grid model and an initial operation mode and jumping to a parameter setting page;
responding to a parameter setting instruction received on the parameter setting page, and determining target operation parameters;
establishing a power grid system according to the target operation parameters;
and after the load flow calculation result is generated, displaying the load flow calculation result on a current interface.
8. A power flow calculation apparatus for a power grid system, comprising:
the load flow calculation type selection module is used for responding to a selection instruction input by any client and selecting a target load flow calculation type from a plurality of preset load flow calculation types;
the input data acquisition module is used for acquiring corresponding input data according to the target load flow calculation type;
the load flow calculation module is used for carrying out load flow calculation by adopting the input data to generate a load flow calculation result;
the load flow calculation result returning module is used for returning the load flow calculation result to the client; and the client is used for adjusting the power grid system according to the load flow calculation result.
9. The apparatus of claim 8, further comprising:
the operation selection module is used for selecting a target power grid model and an initial operation mode and jumping to a parameter setting page when a model selection instruction is received at a preset main control interface;
the operation parameter selection module is used for responding to a parameter setting instruction received on the parameter setting page and determining a target operation parameter;
the power grid system creating module is used for creating a power grid system according to the target operation parameters;
and the load flow calculation result display module is used for displaying the load flow calculation result on the current interface after the load flow calculation result is generated.
10. An electronic device, characterized by comprising a memory and a processor, wherein the memory stores a computer program, and the computer program, when executed by the processor, causes the processor to perform the steps of the method for calculating a power flow of a power grid system according to any one of claims 1 to 7.
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