CN113659574A - Closed-loop and open-loop simulation platform and simulation method for power distribution network with phase angle difference - Google Patents
Closed-loop and open-loop simulation platform and simulation method for power distribution network with phase angle difference Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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Abstract
The invention relates to a phase angle difference power distribution network closed-loop and open-loop simulation platform and a method, which comprises a drawing function module and a loop current calculation module, wherein the drawing function module comprises a drawing interface and an electrical equipment model adding module, starting power supply points on the middle and low voltage sides of each 220kV transformer model are used, according to the actual grid structure of a regional power grid, the corresponding electrical equipment model is added to the drawing interface through the electrical equipment model adding module, the setting and mutual connection of the parameters and the states of each electrical equipment model are completed according to the actual grid structure of the regional power grid, and finally, a power flow simulation diagram with the middle and low voltage sides of each 220kV transformer model as the starting power supply points is drawn. The method can effectively solve the problems that the existing phase angle difference power distribution network loop closing and opening loop is manually calculated and analyzed by technicians, the conclusion error is large, the analysis result is simple, the significance to actual operation is not large, and power grid accidents and risks are easy to occur when the operation is carried out according to the analysis result.
Description
Technical Field
The utility model relates to a distribution network field especially relates to a take phase angle difference distribution network to close and separate ring simulation platform and simulation method.
Background
The regional power grid is not provided with a simulation platform which is specially used for simulating the closed-loop and open-loop of the power distribution network with the phase angle difference originally, the closed-loop and open-loop of the power distribution network with the phase angle difference originally is calculated and analyzed manually by technicians, the conclusion error is large, the analysis result is simple, the significance to actual operation is not large, and power grid accidents and risks are easy to occur when the operation is carried out according to the analysis result.
Disclosure of Invention
The invention aims to provide a phase angle difference power distribution network loop closing and opening simulation platform which can effectively solve the problems that the existing phase angle difference power distribution network loop closing and opening simulation platform is large in conclusion error, simple in analysis result and small in practical operation significance due to the fact that technicians manually calculate and analyze the existing phase angle difference power distribution network loop closing and opening simulation platform, and power grid accidents and risks are easy to occur due to the fact that operation is carried out according to the analysis result.
The technical scheme adopted by the invention for solving the technical problems is as follows: the power distribution network closed-loop and open-loop simulation platform with the phase angle difference comprises a drawing function module and a loop current calculation module, wherein the drawing function module comprises a drawing interface and an electrical equipment model adding module, starting power supply points on the middle and low voltage sides of each 220kV transformer model are used for adding corresponding electrical equipment models to the drawing interface through the electrical equipment model adding module according to the actual grid structure of a regional power grid, setting and mutual connection of parameters and states of each electrical equipment model are completed according to the actual grid structure of the regional power grid, and finally, a power flow simulation diagram with the middle and low voltage sides of each 220kV transformer model as starting power supply points is drawn; the power flow simulation diagram comprises all 110kV line models connected with the medium voltage test of the 220kV transformer model and all 35kV line models connected with the low voltage side of the 220kV transformer model; the 110kV transformer models are connected with all 110kV line models, and the 10kV line models and the 35kV line models are connected with all the 110kV transformer models; the 35kV transformer model is connected with each 35kV line model, and the 10kV line model is connected with the 35kV transformer model; and switch models on all 110kV line models, 35kV line models and 10kV line models.
Further, a power supply system of 110kV or below adopts an open-loop operation mode of a power grid loop model structure, when maintenance is needed, the open-loop operation mode is used for realizing closed-loop operation through a switch model of a closed-loop point, and at the moment, a loop model is formed; different loop models can be formed by closing the switch model of each open-loop point in each 220kV subarea tidal current diagram; the loop current calculation module can calculate the corresponding loop model current of each loop model; the method comprises the following steps of (1) including a 35kV loop model with phase angle difference and the rest loop models without phase angle difference;
when the circulation computing module computes, the method mainly comprises the following steps: in each loop model, comparing the current value and the current phase of each electrical equipment model with the protection fixed value of the electrical equipment model, and generating an analysis report; whether the protection fixed values of the electrical equipment models need to be adjusted or not needs to be indicated in the analysis report; when the protection fixed value of the electrical equipment model is larger than the current value, adjustment is not needed; when the protection fixed value of the electrical equipment model is less than or equal to the current value, the protection fixed value needs to be increased;
when the circulation calculating module calculates, the method further comprises the following steps: and calculating the impact current value when the loop opening point is closed according to the resistance and the inductance of the electrical equipment model in the loop model, comparing the impact current value with the rated current value of each electrical equipment model, judging whether the safe operation of the equipment is influenced, and displaying the result in an analysis report.
Furthermore, the analysis report also comprises a corresponding power flow simulation diagram, and the analysis report shows that the corresponding power flow simulation diagram is consistent with the loop model calculated by the loop current calculation module.
The intelligent simulation method for the phase angle difference synthetic ring of the power distribution mesh belt is characterized by comprising the following steps of: the method comprises the following steps:
step (1), according to an actual grid structure of a regional power grid, taking 220kV transformers as units, adding corresponding electrical equipment models to a drawing interface of a simulation platform one by one through an electrical equipment model adding module, completing interconnection and parameter setting of the electrical equipment models according to the actual grid structure, and finally drawing a power flow simulation diagram taking the middle and low voltage sides of each 220kV transformer model as starting power supply points; the power flow simulation diagram comprises all 110kV line models connected with the medium voltage test of the 220kV transformer model and all 35kV line models connected with the low voltage side of the 220kV transformer model; the 110kV transformer models are connected with all 110kV line models, and the 10kV line models and the 35kV line models are connected with all the 110kV transformer models; the 35kV transformer model is connected with each 35kV line model, and the 10kV line model is connected with the 35kV transformer model; and switch models on all 110kV line models, 35kV line models and 10kV line models; each 220kV transformer in the actual grid structure of the regional power grid corresponds to a power flow simulation diagram, and each power flow simulation diagram is named and stored independently; the recording of parameters comprises resistance and inductance;
step (2), recording the voltage value and the load value of each electrical equipment model in the power flow simulation diagram in real time according to the real-time numerical value of the actual grid structure of the regional power grid;
step (3), defining the types of all switch models in each power flow simulation diagram according to the actual grid structure of the regional power grid, wherein the switch model types comprise an open-loop switch model, a closed-loop switch model, a standby open-loop switch model and a common switch model; then setting the states of each switch model, wherein the states of the switch models comprise an operating state, a hot standby state and a cold standby state;
setting current protection fixed values of all switch models in each power flow simulation diagram, setting three sections of current protection fixed values of each switch model, and setting the name, the fixed value, the protection action time and the power flow direction of each section of current protection fixed value;
step (5), according to the scheduled condition of the planned maintenance, the load is converted into the simulation operation without power cut; firstly, finding out a corresponding power flow simulation diagram, and carrying out simulation operation in the corresponding power flow simulation diagram;
if the to-be-overhauled line model is a 35kV line model, firstly, the types of two switch models on two sides of the to-be-overhauled line model are respectively adjusted to be an open-loop switch model and a standby open-loop switch model;
step (6), modifying the state of a closed loop switch model of an open loop point on a line model which is directly connected with the line model to be overhauled and has the same voltage level into closed state to form a loop model;
step (7), obtaining a loop model current value of the loop model in the step (6) through a loop calculation function of a system, comparing the loop model current value with current carrying capacities of a transformer model and a wire model in a power flow simulation diagram, and if the loop model current value exceeds the current carrying capacities of the transformer model and the wire model in the power flow simulation diagram, carrying out current reduction simulation;
step (8), during current reduction simulation, firstly performing current reduction simulation of the same voltage class, screening out all 35kV line models which have topological connection relation with the loop model, and defining the 35kV line models as simulated 35kV line models; according to the principle of distance, whether the corresponding 35kV line model is suitable for the current reduction simulation of the same voltage class is judged in sequence; when judging, firstly adjusting the state of a closed loop switch model connected with the loop model and led out by another 110kV transformer model and on an open loop point on a 35kV line model to be closed, then adjusting the state of a switch model led out by the 110kV transformer model on the original loop model and on the 35kV line model to be opened to form a new loop model, and then carrying out loop calculation;
when the current value of the obtained loop model does not exceed the temperature rise current value, finishing the current reduction simulation of the same voltage class, and positioning and closing a new loop model formed by a simulated 35kV line model and a corresponding 110kV transformer model;
if the current value of the obtained loop model exceeds the temperature rise current value, the 35kV power supply circuit is judged not to be suitable for the current reduction simulation of different voltage classes, and the 35kV power supply circuit at the next distance is judged until meeting the 35kV power supply circuit suitable for the current reduction simulation of the same voltage class; if all 35kV power supply circuits are not suitable for the current reduction simulation of different voltage levels, performing the current reduction simulation of a low voltage level;
step (9), screening out all 10kV line models which have a connection relation with the to-be-overhauled line model during the current reduction simulation of the low-voltage level, and defining the 10kV line models as to be converted to the 10kV line models; sequencing the simulation 10kV line models according to the importance degree of the load carried by the electrical equipment in the actual grid structure of the power grid of the corresponding region, and judging the simulation 10kV line models with high importance degree of the load; in the judging process, closing a loop closing switch model of a loop opening point in a 10kV line model to be converted, modifying the state of a switch model in an original loop model between two 35kV power supply bus models corresponding to two ends of the 10kV line model to be converted into an open state, then forming a new loop model, and performing loop calculation of the corresponding loop model; if the current value of the loop model does not exceed the allowed temperature rise current, defining the new loop model as a loop closing loop model, and if the current value of the loop model exceeds the allowed temperature rise current, judging the next 10kV line model to be transferred until the current value of the loop model does not exceed the allowed temperature rise current;
step (11), calculating the simulated closed-loop model through a loop current calculation module, generating an analysis report and sending the analysis report to an operator, wherein the analysis report comprises a structure diagram of the simulated closed-loop model finally, and the structure diagram of the closed-loop model comprises protection fixed value adjustment suggestions and states of all switch models; an operator can select a loop closing transfer line during maintenance according to the analysis report, and adjust the switch state and the protection fixed value in the line according to the analysis report so as to realize loop closing transfer.
The invention has the beneficial effects that: drawing a power flow simulation diagram according to an actual grid structure of a regional power grid, wherein the power flow simulation diagram can be separately filed by taking each 220kV transformer as a unit, and is convenient to fetch at any time; the flow simulation diagram on the simulation platform can realize more visual data graphical display, and is convenient for operators to observe and read data; different power flow simulation diagrams can be called as required to simulate the corresponding topological structure, and data and the like can be adjusted as required, so that the simulation is more flexible. Most importantly, through the simulation platform, the simulation of phase angle difference power distribution network loop closing and loop opening of a phase angle difference-free power distribution network can be achieved by taking each 220kV transformer as a unit, a simulation result is directly obtained, the precision degree is high and visual, an operator can complete preparation of error-free loop closing and opening operation only by operating according to the simulation result, technical support is provided for reliability of a power grid, the problems that the existing phase angle difference power distribution network loop closing and opening is manually calculated and analyzed by technicians, the conclusion error is large, the analysis result is simple and the significance to actual operation is small are effectively solved, and operation is performed according to the analysis result, and power grid accidents and risks are easy to occur.
The invention will be explained in more detail below with reference to the drawings and examples.
Drawings
Fig. 1 is a schematic diagram of a power flow simulation diagram.
FIG. 2 is a schematic diagram of a simulation platform interface according to the present invention.
Fig. 3 is a partially enlarged view of fig. 2.
Fig. 4 is a schematic diagram of the simulation platform interface according to the present invention when performing loop current calculation.
Fig. 5 is a schematic diagram of a simulation platform interface according to the present invention when displaying a circulation calculation result.
Fig. 6 is a schematic diagram of display of advice information when the simulation platform interface according to the present invention displays a circulation calculation result.
Fig. 7 is a schematic display diagram of a power flow simulation diagram when a problem exists in the drawing of the power flow simulation diagram after the circulation calculation is performed on the simulation platform interface according to the present invention.
Detailed Description
The embodiment of the invention relates to a closed-loop and open-loop simulation platform for a power distribution network with a phase angle difference, which comprises a drawing function module and a circulation calculation module, wherein the drawing function module comprises a drawing interface and an electrical equipment model adding module, starting power supply points on the medium-voltage side and the low-voltage side of each 220kV transformer model are added to the drawing interface through the electrical equipment model adding module according to the actual grid structure of a regional power grid, the setting and mutual connection of parameters and states of each electrical equipment model are completed according to the actual grid structure of the regional power grid, and finally, a power flow simulation graph with the medium-voltage side and the low-voltage side of each 220kV transformer model as the starting power supply points is drawn; the power flow simulation diagram comprises all 110kV line models connected with the medium voltage test of the 220kV transformer model and all 35kV line models connected with the low voltage side of the 220kV transformer model; the 110kV transformer models are connected with all 110kV line models, and the 10kV line models and the 35kV line models are connected with all the 110kV transformer models; the 35kV transformer model is connected with each 35kV line model, and the 10kV line model is connected with the 35kV transformer model; and switch models on all 110kV line models, 35kV line models, 10kV line models and other electrical equipment models.
The electrical equipment model adding module can add, delete and edit electrical equipment models, and the electrical equipment models comprise the addition of electrical equipment models such as buses, leads, double-coil transformers, three-coil transformers, generators, loads, substations, capacitors, series reactors, parallel reactors, switches, bus connecting lines, side bus PT, surface ground, grounding disconnecting links, PT, earth surface with capacitors, PT with fuses, double-coil PT, lightning arresters and 35kVPT, and also comprise the addition of texts; by selecting the required electrical equipment model and then adding it to the drawing interface, its parameters can be set.
After the power flow simulation picture is finished, calculation can be carried out through the circulation flow calculation module, if the power flow simulation picture has errors, the wrong places can be displayed after calculation, and if the electrical equipment models are not connected to the bus, the model setting is problematic, and the like. Reference may be made to fig. 7.
The power supply system of 110kV or below adopts an open-loop operation mode of a power grid loop model structure, when maintenance is needed, the open-loop operation mode is used for realizing closed-loop operation through a switch model of a closed-loop point, and at the moment, a loop model is formed; different loop models can be formed by closing the switch model of each open-loop point in each 220kV subarea tidal current diagram; the loop current calculation module can calculate the corresponding loop model current of each loop model; the method comprises the following steps of (1) including a 35kV loop model with phase angle difference and the rest loop models without phase angle difference;
when the circulation computing module computes, the method mainly comprises the following steps: in each loop model, comparing the current value and the current phase of each electrical equipment model with the protection fixed value of the electrical equipment model, and generating an analysis report; whether the protection fixed values of the electrical equipment models need to be adjusted or not needs to be indicated in the analysis report; when the protection fixed value of the electrical equipment model is larger than the current value, adjustment is not needed; when the protection fixed value of the electrical equipment model is less than or equal to the current value, the protection fixed value needs to be increased;
when the circulation calculating module calculates, the method further comprises the following steps: and calculating the impact current value when the loop opening point is closed according to the resistance and the inductance of the electrical equipment model in the loop model, comparing the impact current value with the rated current value of each electrical equipment model, judging whether the safe operation of the equipment is influenced, and displaying the result in an analysis report.
The analysis report also comprises a corresponding power flow simulation diagram, and the analysis report shows that the corresponding power flow simulation diagram is consistent with the loop model calculated by the loop current calculation module.
The intelligent simulation method for the phase angle difference synthetic ring of the power distribution mesh belt is characterized by comprising the following steps of: the method comprises the following steps:
step (1), according to an actual grid structure of a regional power grid, taking 220kV transformers as units, adding corresponding electrical equipment models to a drawing interface of a simulation platform one by one through an electrical equipment model adding module, completing interconnection and parameter setting of the electrical equipment models according to the actual grid structure, and finally drawing a power flow simulation diagram taking the middle and low voltage sides of each 220kV transformer model as starting power supply points; the power flow simulation diagram comprises all 110kV line models connected with the medium voltage test of the 220kV transformer model and all 35kV line models connected with the low voltage side of the 220kV transformer model; the 110kV transformer models are connected with all 110kV line models, and the 10kV line models and the 35kV line models are connected with all the 110kV transformer models; the 35kV transformer model is connected with each 35kV line model, and the 10kV line model is connected with the 35kV transformer model; and all 110kV line models, 35kV line models, 10kV line models and switch models on other electrical equipment models; each 220kV transformer in the actual grid structure of the regional power grid corresponds to a power flow simulation diagram, and each power flow simulation diagram is named and stored independently; the recording of parameters comprises resistance and inductance;
step (2), recording the voltage value and the load value of each electrical equipment model in the power flow simulation diagram in real time according to the real-time numerical value of the actual grid structure of the regional power grid;
step (3), defining the types of all switch models in each power flow simulation diagram according to the actual grid structure of the regional power grid, wherein the switch model types comprise an open-loop switch model, a closed-loop switch model, a standby open-loop switch model and a common switch model; then setting the states of each switch model, wherein the states of the switch models comprise an operating state, a hot standby state and a cold standby state;
setting current protection fixed values of all switch models in each power flow simulation diagram, setting three sections of current protection fixed values of each switch model, and setting the name, the fixed value, the protection action time and the power flow direction of each section of current protection fixed value;
step (5), according to the scheduled condition of the planned maintenance, the load is converted into the simulation operation without power cut; firstly, finding out a corresponding power flow simulation diagram, and carrying out simulation operation in the corresponding power flow simulation diagram;
if the to-be-overhauled line model is a 35kV line model, firstly, the types of two switch models on two sides of the to-be-overhauled line model are respectively adjusted to be an open-loop switch model and a standby open-loop switch model;
step (6), modifying the state of a closed loop switch model of an open loop point on a line model which is directly connected with the line model to be overhauled and has the same voltage level into closed state to form a loop model;
step (7), obtaining a loop model current value of the loop model in the step (6) through a loop calculation function of a system, comparing the loop model current value with current carrying capacities of a transformer model and a wire model in a power flow simulation diagram, and if the loop model current value exceeds the current carrying capacities of the transformer model and the wire model in the power flow simulation diagram, carrying out current reduction simulation;
step (8), during current reduction simulation, firstly performing current reduction simulation of the same voltage class, screening out all 35kV line models which have topological connection relation with the loop model, and defining the 35kV line models as simulated 35kV line models; according to the principle of distance, whether the corresponding 35kV line model is suitable for the current reduction simulation of the same voltage class is judged in sequence; when judging, firstly adjusting the state of a closed loop switch model connected with the loop model and led out by another 110kV transformer model and on an open loop point on a 35kV line model to be closed, then adjusting the state of a switch model led out by the 110kV transformer model on the original loop model and on the 35kV line model to be opened to form a new loop model, and then carrying out loop calculation;
when the current value of the obtained loop model does not exceed the temperature rise current value, finishing the current reduction simulation of the same voltage class, and positioning and closing a new loop model formed by a simulated 35kV line model and a corresponding 110kV transformer model;
if the current value of the obtained loop model exceeds the temperature rise current value, the 35kV power supply circuit is judged not to be suitable for the current reduction simulation of different voltage classes, and the 35kV power supply circuit at the next distance is judged until meeting the 35kV power supply circuit suitable for the current reduction simulation of the same voltage class; if all 35kV power supply circuits are not suitable for the current reduction simulation of different voltage levels, performing the current reduction simulation of a low voltage level;
step (9), screening out all 10kV line models which have a connection relation with the to-be-overhauled line model during the current reduction simulation of the low-voltage level, and defining the 10kV line models as to be converted to the 10kV line models; sequencing the simulation 10kV line models according to the importance degree of the load carried by the electrical equipment in the actual grid structure of the power grid of the corresponding region, and judging the simulation 10kV line models with high importance degree of the load; in the judging process, closing a loop closing switch model of a loop opening point in a 10kV line model to be converted, modifying the state of a switch model in an original loop model between two 35kV power supply bus models corresponding to two ends of the 10kV line model to be converted into an open state, then forming a new loop model, and performing loop calculation of the corresponding loop model; if the current value of the loop model does not exceed the allowed temperature rise current, defining the new loop model as a loop closing loop model, and if the current value of the loop model exceeds the allowed temperature rise current, judging the next 10kV line model to be transferred until the current value of the loop model does not exceed the allowed temperature rise current;
step (11), calculating the simulated closed-loop model through a loop current calculation module, generating an analysis report and sending the analysis report to an operator, wherein the analysis report comprises a structure diagram of the simulated closed-loop model finally, and the structure diagram of the closed-loop model comprises protection fixed value adjustment suggestions and states of all switch models; an operator can select a loop closing transfer line during maintenance according to the analysis report, and adjust the switch state and the protection fixed value in the line according to the analysis report so as to realize loop closing transfer.
In the description of the present invention, it is to be understood that the terms "center", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified. Furthermore, the term "comprises" and any variations thereof is intended to cover non-exclusive inclusions.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The invention is described above with reference to the accompanying drawings. It is to be understood that the specific implementations of the invention are not limited in this respect. Various insubstantial improvements are made by adopting the method conception and the technical scheme of the invention; the present invention is not limited to the above embodiments, and can be modified in various ways.
Claims (4)
1. Take phase angle difference distribution network to close and separate ring simulation platform, its characterized in that: the power flow simulation system comprises a drawing function module and a circulation calculation module, wherein the drawing function module comprises a drawing interface and an electrical equipment model adding module, a power supply point is started at the middle and low voltage sides of each 220kV transformer model, the corresponding electrical equipment model is added to the drawing interface through the electrical equipment model adding module according to the actual grid structure of a regional power grid, the setting and mutual connection of parameters and states of each electrical equipment model are completed according to the actual grid structure of the regional power grid, and a power flow simulation diagram is finally drawn by taking the middle and low voltage sides of each 220kV transformer model as the starting power supply point; the power flow simulation diagram comprises all 110kV line models connected with the medium voltage test of the 220kV transformer model and all 35kV line models connected with the low voltage side of the 220kV transformer model; the 110kV transformer models are connected with all 110kV line models, and the 10kV line models and the 35kV line models are connected with all the 110kV transformer models; the 35kV transformer model is connected with each 35kV line model, and the 10kV line model is connected with the 35kV transformer model; switch models on all 110kV line models, 35kV line models and 10kV line models; other appliance models are also included.
2. The phase angle difference power distribution network convergence and disconnection simulation platform of claim 1, wherein: the power supply system of 110kV or below adopts an open-loop operation mode of a power grid loop model structure, when maintenance is needed, in order to ensure the continuous power supply needs of users, the open-loop operation mode is used for realizing closed-loop operation through a switch model of a closed-loop point, and at the moment, a loop model is formed; different loop models can be formed by closing the switch model of each open-loop point in each 220kV subarea tidal current diagram; the loop current calculation module can calculate the corresponding loop model current of each loop model; the method comprises the following steps of (1) including a 35kV loop model with phase angle difference and the rest loop models without phase angle difference;
when the circulation computing module computes, the method mainly comprises the following steps: in each loop model, comparing the current value and the current phase of each electrical equipment model with the protection fixed value of the electrical equipment model, and generating an analysis report; whether the protection fixed values of the electrical equipment models need to be adjusted or not needs to be indicated in the analysis report; when the protection fixed value of the electrical equipment model is larger than the current value, adjustment is not needed; when the protection fixed value of the electrical equipment model is less than or equal to the current value, the protection fixed value needs to be increased;
when the circulation calculating module calculates, the method further comprises the following steps: and calculating the impact current value when the loop opening point is closed according to the resistance and the inductance of the electrical equipment model in the loop model, comparing the impact current value with the rated current value of each electrical equipment model, judging whether the safe operation of the equipment is influenced, and displaying the result in an analysis report.
3. The phase angle difference power distribution network convergence and disconnection simulation platform of claim 2, wherein: the analysis report also comprises a corresponding power flow simulation diagram, and the analysis report shows that the corresponding power flow simulation diagram is consistent with the loop model calculated by the loop current calculation module.
4. The method for simulating the closed loop and the open loop of the power distribution network with the phase angle difference is characterized by comprising the following steps of: the method comprises the following steps:
step (1), according to an actual grid structure of a regional power grid, taking 220kV transformers of a 220kV transformer substation as a unit, adding corresponding electrical equipment models to a drawing interface of a simulation platform one by one through an electrical equipment model adding module, completing interconnection and parameter setting of the electrical equipment models according to the actual grid structure, and finally drawing a power flow simulation diagram taking the middle and low voltage sides of each 220kV transformer model as starting power supply points; the power flow simulation diagram comprises all 110kV line models connected with the medium voltage test of the 220kV transformer model and all 35kV line models connected with the low voltage side of the 220kV transformer model; the 110kV transformer models are connected with all 110kV line models, and the 10kV line models and the 35kV line models are connected with all the 110kV transformer models; the 35kV transformer model is connected with each 35kV line model, and the 10kV line model is connected with the 35kV transformer model; the switch models on all the 110kV line models, the 35kV line models and the 10kV line models and other electrical equipment models are also included;
each 220kV transformer in the actual grid structure of the regional power grid corresponds to a power flow simulation diagram, and each power flow simulation diagram is named and stored independently; the recording of parameters comprises resistance and inductance;
step (2), recording the voltage value and the load value of each electrical equipment model in the power flow simulation diagram in real time according to the real-time numerical value of the actual grid structure of the regional power grid;
step (3), defining the types of all switch models in each power flow simulation diagram according to the actual grid structure of the regional power grid, wherein the switch model types comprise an open-loop switch model, a closed-loop switch model, a standby open-loop switch model and a common switch model; then setting the states of each switch model, wherein the states of the switch models comprise an operating state, a hot standby state and a cold standby state;
setting current protection fixed values of all switch models in each power flow simulation diagram, setting three sections of current protection fixed values of each switch model, and setting the name, the fixed value, the protection action time and the power flow direction of each section of current protection fixed value;
step (5), according to the scheduled condition of the planned maintenance, the load is converted into the simulation operation without power cut; firstly, finding out a corresponding power flow simulation diagram, and carrying out simulation operation in the corresponding power flow simulation diagram;
if the to-be-overhauled line model is a 35kV line model, firstly, the types of two switch models on two sides of the to-be-overhauled line model are respectively adjusted to be an open-loop switch model and a standby open-loop switch model;
step (6), modifying the state of a closed loop switch model of an open loop point on a line model which is directly connected with the line model to be overhauled and has the same voltage level into closed state to form a loop model;
step (7) obtaining a loop model current value of the loop model in the step (6) through a loop current calculation function of the system, comparing the loop model current value with current-carrying capacities of all transformer models and line models in the power flow simulation diagram, and if the loop model current value exceeds the current-carrying capacities, performing current reduction simulation;
step (8), during current reduction simulation, firstly performing current reduction simulation of the same voltage class, screening out all 35kV line models which have topological connection relation with the loop model, and defining the 35kV line models as simulated 35kV line models; according to the principle of distance, whether the corresponding 35kV line model is suitable for the current reduction simulation of the same voltage class is judged in sequence; when judging, firstly adjusting the state of a closed loop switch model connected with the loop model and led out by another 110kV transformer model and on an open loop point on a 35kV line model to be closed, then adjusting the state of a switch model led out by the 110kV transformer model on the original loop model and on the 35kV line model to be opened to form a new loop model, and then carrying out loop calculation;
when the current value of the obtained loop model does not exceed the temperature rise current value, finishing the current reduction simulation of the same voltage class, and positioning and closing a new loop model formed by a simulated 35kV line model and a corresponding 110kV transformer model;
if the current value of the obtained loop model exceeds the temperature rise current value, the 35kV power supply circuit is judged not to be suitable for the current reduction simulation of different voltage classes, and the 35kV power supply circuit at the next distance is judged until meeting the 35kV power supply circuit suitable for the current reduction simulation of the same voltage class; if all 35kV power supply circuits are not suitable for the current reduction simulation of different voltage levels, performing the current reduction simulation of a low voltage level;
step (9), screening out all 10kV line models which have a connection relation with the to-be-overhauled line model during the current reduction simulation of the low-voltage level, and defining the 10kV line models as to be converted to the 10kV line models; sequencing the simulation 10kV line models according to the importance degree of the load carried by the electrical equipment in the actual grid structure of the power grid of the corresponding region, and judging the simulation 10kV line models with high importance degree of the load; in the judging process, closing a loop closing switch model of a loop opening point in a 10kV line model to be converted, modifying the state of a switch model in an original loop model between two 35kV power supply bus models corresponding to two ends of the 10kV line model to be converted into an open state, then forming a new loop model, and performing loop calculation of the corresponding loop model; if the current value of the loop model does not exceed the allowed temperature rise current, defining the new loop model as a loop closing loop model, and if the current value of the loop model exceeds the allowed temperature rise current, judging the next 10kV line model to be transferred until the current value of the loop model does not exceed the allowed temperature rise current;
step (11), calculating the simulated closed-loop model through a loop current calculation module, generating an analysis report and sending the analysis report to an operator, wherein the analysis report comprises a structure diagram of the simulated closed-loop model finally, and the structure diagram of the closed-loop model comprises protection fixed value adjustment suggestions and states of all switch models; an operator can select a loop closing transfer line during maintenance according to the analysis report, and adjust the switch state and the protection fixed value in the line according to the analysis report so as to realize loop closing transfer.
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