阅读说明：本技术 电网潮流计算扩展拼接模型及其方法 (Power grid load flow calculation extension splicing model and method thereof ) 是由 侯保刚 刘晓亮 方磊 吴金玉 晋飞 李国强 孙炜春 王建勋 吕传志 赵志军 丁立 于 2021-08-26 设计创作，主要内容包括：本发明涉及一种电网潮流计算扩展拼接模型及其方法,属于电网潮流计算技术领域。本发明所述包括如下步骤：S1：省调调控系统状态估计结果导出；S2：地调侧外网等值文件管理：包括如下小步：S21：状态估计、S22：获取实时的状态估计断面和模型、S23：获取历史的状态估计断面和模型；S3：地调侧省调外网详细模型拼接；S4：地调侧应用分析：包括如下小步：S41：调度员潮流、S42：静态安全分析。本发明通过全网模型拼接的方式,将省调导出的包含全网设备模型和量测的QS文件与各地调电网本地模型进行拼接,形成地区电网包含外网详细模型的等值系统,从而减小边界附近元件的计算误差,改善边界线路模型的计算精度。(The invention relates to a power grid load flow calculation extension splicing model and a method thereof, belonging to the technical field of power grid load flow calculation. The invention comprises the following steps: s1: exporting a state estimation result of the provincial dispatching regulation system; s2: and (3) local tone side external network equivalent file management: the method comprises the following steps: s21: state estimation, S22: acquiring a real-time state estimation section and model, S23: acquiring a historical state estimation section and a historical state estimation model; s3: splicing detailed models of the provincial provinc; s4: application analysis on the tone side: the method comprises the following steps: s41: dispatcher flow, S42: static security analysis. According to the method, the QS files which are derived by provincial regulations and contain the whole-network equipment model and the measured QS files are spliced with local models of local regulating power networks of various regions in a whole-network model splicing mode to form an equivalence system of the regional power network containing the external network detailed model, so that the calculation errors of elements near the boundary are reduced, and the calculation accuracy of the boundary line model is improved.)

1. A power grid load flow calculation extension splicing method is characterized by comprising the following steps:

s1: and (3) exporting a state estimation result of the provincial dispatching regulation system: the state estimation of the provincial dispatching regulation and control system leads out the calculation result in a period, and a detailed QS file containing model parameters and measurement in the whole network is led out through the provincial dispatching regulation and control system and is issued to a local dispatching;

s2: and (3) local tone side external network equivalent file management: the method comprises the following steps:

s21: and (3) state estimation: when the local dispatching state estimation main program integral point saves the section, saving the real-time section from the directory, simultaneously saving the latest external network QS file matched in the directory in a file service mode, and recording the name of the QS file and the provincial dispatching network model time;

s22: acquiring a real-time state estimation section and a real-time state estimation model: when the state estimation real-time section is obtained, automatically obtaining matched QS of the external network, then modeling according to QS files of the internal network and the external network, wherein the measured data of the external network is also in the QS files, and analyzing based on the comprehensive model and the section of the internal network and the external network;

s23: acquiring a historical state estimation section and a model: when a state estimation history section is obtained, obtaining the history section by adopting CaseView and updating a history model matched with the history section, simultaneously obtaining a matched external network equivalent file to a service host of network analysis application by adopting file service, and modeling according to QS files of the internal network and the external network;

s3: splicing a detailed model of the provincial outer net: splicing is carried out according to QS files of the provincial dispatching whole network detailed model and combined with a provincial dispatching local model based on equipment point numbers, and the local dispatching local model is read on the basis of the QS files of the local dispatching whole network detailed model and spliced to form a provincial model and a provincial dispatching model splicing model;

s4: application analysis on the tone side: the method comprises the following steps:

s41: dispatcher trend: the dispatcher trend obtains the internal and external network splicing model by taking the state estimation section operation, so that the simulation operation of the equipment in the territory dispatching modeling range can be supported, the calculation result display is also to filter the external network model, and only the information in the territory dispatching modeling range is displayed; the method supports simulation operation and whole-network load flow calculation of the intra-provincial model based on the local dispatching picture;

s42: static security analysis: and the static security analysis acquires an internal and external network splicing model by taking a state estimation section operation, and devices in a local tone range are set by default to participate in N-1 disconnection and out-of-limit detection.

2. The grid power flow calculation expansion splicing method according to claim 1, wherein the provincial regulation and control system of step S1 is provided with a QS file export service program, wherein: the QS file comprises parameters and measurement of all 220kV equipment of the provincial dispatching power grid, the QS file is issued to a provincial dispatching area according to the period, the provincial dispatching is stored in a default directory and comprises model modeling time.

3. The grid power flow calculation extension splicing method according to claim 1, wherein in the step S2, the premise of the local side external network equivalence is that: the provincial dispatching and all local dispatching systems adopt equipment integrated modeling, and the uniformity and uniqueness of equipment identification in the power grid are guaranteed, so that the provincial dispatching established detailed model is spliced with all local dispatching models by directly utilizing convenient conditions to form a detailed external network equivalent model from a superior power grid to a subordinate power grid.

4. The power grid power flow calculation extension splicing method according to claim 1, wherein in step S3, the splicing of the detailed models of the provincial power networks at the local dispatching side, that is, the splicing method of the model of the whole network refers to that the models and measurement files containing the whole network equipment and issued by the local dispatching side receive provincial power networks, and are spliced with the local power grid models of the local dispatching side to form an equivalent system of each regional power grid containing the detailed models of the outside network.

5. The grid flow calculation expanded splicing method according to claim 1, wherein the step S3 includes the following steps:

s31: generating a boundary device table, determining a model splicing range, and searching devices outside the boundary in the local tone model and devices on the boundary in the provincial tone model by a program through device information in the boundary device table in the model splicing process; after the searched equipment is deleted, splicing the rest equipment together to generate a new whole network model;

s32: receiving QS (quality of service) files issued by provincial dispatches, merging an intranet part and an extranet model of a local model by utilizing a model splitting/merging technology, importing the merged intranet part and the extranet model into a system, and finishing the establishment of a full-network model, wherein the method comprises the following specific steps:

s321: exporting a calculation result of a state estimation period of the provincial dispatching regulation system, exporting detailed QS files containing model parameters and measurement in the whole network through sftp service, and issuing the QS files to local dispatches;

s322: after receiving QS files of provincial dispatching, local dispatching performs model splicing according to boundary lines, and mapping conversion between IDs is required due to the fact that the IDs of local dispatching equipment are inconsistent with the IDs of provincial dispatching equipment;

s323: after conversion, QS files based on province and district two levels are carried out to complete the splicing of the whole network model;

s33: the calculation node scale, the calculation time length, the calculation precision and the convergence condition are comprehensively considered, the combined operation practice of the regional power grids is determined, the data calculation accuracy can meet the grid operation requirement after the regional power grids are expanded by 3-5 layers, and the convergence is greatly improved.

6. The grid flow calculation expanded splicing method according to claim 5, wherein in the step S31, the boundary device definition table includes the following contents according to attribute names: ID. The system comprises a local dispatching identification, a provincial dispatching identification, an identifier of a boundary device in a local dispatching model, a boundary device type, an identifier of a device with a local dispatching side connected with the boundary device, a type of a device with a local dispatching side connected with the boundary device, an identifier of a boundary device in a provincial dispatching model, a boundary device type, an identifier of a device with a provincial dispatching side connected with the boundary device, a type of a device with a provincial dispatching side connected with the boundary device, and a station identifier of a station where the boundary device is located.

7. The power grid load flow calculation expansion splicing method according to claim 1, wherein in step S33, in order to reduce the number of times that modeling is required for regional power grid expansion, the modeling time in QS file issued by provincial dispatching and the modeling time of the regional power grid are judged in advance, and when both of them are updated, the hierarchical library model is updated again.

8. The grid power flow calculation expansion splicing method according to claim 1, wherein in step S33, in order to reduce the calculation and analysis time and reduce the number of modeling, only the extranet measurement in the QS file is imported when there is no model change.

9. The utility model provides a power grid load flow calculation extension concatenation model which characterized in that, includes the concatenation model, and the concatenation model divide into internal system I, boundary system B and external system E, wherein:

an internal system I refers to an area which is required to be kept unchanged in the process of detailed calculation simulation and equivalence or an area concerned;

the boundary system B is used for associating the internal system I with the external system E and updating the hierarchical library in a targeted manner so as to extend the area of the internal system I for calculation and isolation error auxiliary calculation;

the external system E, refers to the area adjacent to and interacting with the internal system I, but which can be replaced by some equivalent network without detailed computation.

10. A power grid load flow calculation extension splicing model is characterized by comprising a splicing model, and when the splicing model is used, the power grid load flow calculation extension splicing method according to any one of claims 1-8 is executed.

Technical Field

The invention relates to a power grid load flow calculation extension splicing model and a method thereof, belonging to the technical field of power grid load flow calculation.

Background

At present, each level of regulation and control center only establishes a power grid model within a self regulation and control range, and real-time information of an external network is not generally transmitted to a local regulation and control technology support system, but an equivalent model with fixed parameters is adopted to simulate the response of an external network. In fact, the state of the external system has an important influence on the analysis of the internal system, and under different operation modes, the response of the external network to the disturbance of the internal network is constantly changing, so that the corresponding external network equivalent model parameters should change, and the accuracy of the calculation result of the internal network, particularly the boundary element, cannot be ensured by adopting the fixed external network equivalent model. For provincial dispatching, regional power grids in the provincial region all belong to intra-network equipment, boundary equivalence problems do not exist, and external grid boundary equivalence results of all regions can influence accuracy of power grid analysis and calculation results.

Confirmation criteria: the national grid safety and stability calculation technical specification stipulates that external equivalence is carried out on a system to be researched, and the load flow and voltage distribution of a connecting line before and after equivalence are kept unchanged.

And (3) confirmation process: at present, each region of the whole province mainly adopts an equivalent generator mode to perform external network equivalence. In the equivalent mode, all the tie line power flow calculation nodes are set as balance nodes, when power flow changes occur in the system during power flow calculation, the increase and decrease of the power flow are reflected on the power flow of the balance nodes in an equal proportion according to the size of the resistance and reactance of the balance nodes, so that the power flow distribution of the outer network tie lines is obtained through calculation, the equivalent condition of the outer network cannot be truly reflected, the power flow calculation deviation is large, and the accuracy of the calculated section is influenced. According to the viewpoint of the article description of 'test research on the influence of different external network equivalent models on EMS application effects', under the condition that an equivalent machine is directly hung on the boundary of a power grid model or a bufferless network equivalent mode is adopted, the network equivalence has deviation in different degrees. A power flow calculation method for splicing detailed external network equivalent models from a superior power grid to a subordinate power grid is lacked.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a power grid load flow calculation extension splicing model and a method thereof, which reduce the calculation error of elements near the boundary caused by simple equivalence of the power grid in the current region and improve the calculation accuracy of a boundary line model.

The invention relates to a power grid load flow calculation extension splicing method, which comprises the following steps:

s1: and (3) exporting a state estimation result of the provincial dispatching regulation system: the state estimation of the provincial dispatching regulation and control system leads out the calculation result in a period, and a detailed QS file containing model parameters and measurement in the whole network is led out through the provincial dispatching regulation and control system and is issued to a local dispatching;

s2: and (3) local tone side external network equivalent file management: the method comprises the following steps:

s21: and (3) state estimation: when the local dispatching state estimation main program integral point saves the section, saving the real-time section from the directory, simultaneously saving the latest external network QS file matched in the directory in a file service mode, and recording the name of the QS file and the provincial dispatching network model time;

s22: acquiring a real-time state estimation section and a real-time state estimation model: when the state estimation real-time section is obtained, automatically obtaining matched QS of the external network, then modeling according to QS files of the internal network and the external network, wherein the measured data of the external network is also in the QS files, and analyzing based on the comprehensive model and the section of the internal network and the external network;

s23: acquiring a historical state estimation section and a model: when a state estimation history section is obtained, obtaining the history section by adopting CaseView and updating a history model matched with the history section, simultaneously obtaining a matched external network equivalent file to a service host of network analysis application by adopting file service, and modeling according to QS files of the internal network and the external network;

s3: splicing a detailed model of the provincial outer net: splicing is carried out according to QS files of the provincial dispatching whole network detailed model and combined with a provincial dispatching local model based on equipment point numbers, and the local dispatching local model is read on the basis of the QS files of the local dispatching whole network detailed model and spliced to form a provincial model and a provincial dispatching model splicing model;

s4: application analysis on the tone side: the method comprises the following steps:

s41: dispatcher trend: the dispatcher trend obtains the internal and external network splicing model by taking the state estimation section operation, so that the simulation operation of the equipment in the territory dispatching modeling range can be supported, the calculation result display is also to filter the external network model, and only the information in the territory dispatching modeling range is displayed; the method supports simulation operation and whole-network load flow calculation of the intra-provincial model based on the local dispatching picture;

s42: static security analysis: and the static security analysis acquires an internal and external network splicing model by taking a state estimation section operation, and devices in a local tone range are set by default to participate in N-1 disconnection and out-of-limit detection.

According to the principle of N-1, the safe operation condition of a system after a single element or a specific element set exits from operation is studied one by one on a certain network section of an operating power system or a research state, whether equipment overload and bus voltage out-of-limit occur or not is verified, and the method is also called N-1 scanning. Setting operation is carried out under a given (or assumed) operation mode, the operation mode is changed, and the power flow analysis and power flow calculation characteristics of the system are analyzed.

Preferably, the provincial regulation and control system of step S1 is built-in with a QS file export service program, wherein: the QS file comprises parameters and measurement of all 220kV equipment of the provincial dispatching power grid, the QS file is issued to a provincial dispatching area according to the period, the provincial dispatching is stored in a default directory and comprises model modeling time.

Preferably, in step S2, the premise of the equal value of the local tone side outer network is that: the provincial dispatching and all local dispatching systems adopt equipment integrated modeling, and the uniformity and uniqueness of equipment identification in the power grid are guaranteed, so that the provincial dispatching established detailed model is spliced with all local dispatching models by directly utilizing the convenient condition to form a detailed external network equivalent model from a superior power grid to a subordinate power grid.

Preferably, in step S3, the local dispatching side province dispatching external network detailed model splicing, that is, the whole network model splicing method, means that models and measurement files containing whole network equipment released by local dispatching receiving provinces and dispatches are spliced with local dispatching local power grid models to form an equivalent system of each regional power grid containing the external network detailed model.

Preferably, the step S3 includes the following steps:

s31: and generating a boundary device table and determining the splicing range of the model. In the process of model splicing, a program searches equipment outside the boundary in the local tone model and equipment on the side in the provincial tone model through equipment information in a boundary equipment table; after the searched equipment is deleted, splicing the rest equipment together to generate a new whole network model;

s32: receiving QS (quality of service) files issued by provincial dispatches, merging an intranet part and an extranet model of a local model by utilizing a model splitting/merging technology, importing the merged intranet part and the extranet model into a system, and finishing the establishment of a full-network model, wherein the method comprises the following specific steps:

s321: exporting a calculation result of a state estimation period of the provincial dispatching regulation system, exporting detailed QS files containing model parameters and measurement in the whole network through sftp service, and issuing the QS files to local dispatches;

s322: after receiving QS files of provincial dispatching, local dispatching performs model splicing according to boundary lines, and mapping conversion between IDs is required due to the fact that the IDs of local dispatching equipment are inconsistent with the IDs of provincial dispatching equipment;

s323: after conversion, QS files based on province and district two levels are carried out to complete the splicing of the whole network model;

s33: the calculation node scale, the calculation time length, the calculation precision and the convergence condition are comprehensively considered, the combined operation practice of the regional power grids is determined, the data calculation accuracy can meet the grid operation requirement after the regional power grids are expanded by 3-5 layers, and the convergence is greatly improved.

Preferably, in step S31, the boundary device definition table includes the following contents according to the attribute name: ID. The system comprises a local dispatching identification, a provincial dispatching identification, an identifier of a boundary device in a local dispatching model, a boundary device type, an identifier of a device with a local dispatching side connected with the boundary device, a type of a device with a local dispatching side connected with the boundary device, an identifier of a boundary device in a provincial dispatching model, a boundary device type, an identifier of a device with a provincial dispatching side connected with the boundary device, a type of a device with a provincial dispatching side connected with the boundary device, and a station identifier of a station where the boundary device is located.

Preferably, in step S33, in order to reduce the number of times that modeling is required for the external expansion of the regional power grid, the modeling time in the QS file issued by the provincial government and the modeling time of the regional power grid are determined in advance, and when both of them are updated, the hierarchical library model is updated again.

Preferably, in step S33, in order to reduce the calculation and analysis time and reduce the number of modeling operations, only extranet measurements in QS files are imported when there is no model change.

The power grid load flow calculation extension splicing model comprises a splicing model, wherein the splicing model is divided into an internal system I, a boundary system B and an external system E, and the power grid load flow calculation extension splicing model comprises the following steps:

an internal system I refers to an area which is required to be kept unchanged in the process of detailed calculation simulation and equivalence or an area concerned;

the boundary system B is used for associating the internal system I with the external system E and updating the hierarchical library in a targeted manner so as to extend the area of the internal system I for calculation and isolation error auxiliary calculation;

the external system E, refers to the area adjacent to and interacting with the internal system I, but which can be replaced by some equivalent network without detailed computation.

The power grid load flow calculation extension splicing model comprises a splicing model, and the power grid load flow calculation extension splicing method is executed when the splicing model is used.

The invention has the beneficial effects that: according to the power grid load flow calculation expansion splicing model and the power grid load flow calculation expansion splicing method, the QS files which are derived from provincial dispatches and contain the whole-network equipment model and the measured QS files are spliced with local models of local dispatching power grids of all regions in a whole-network model splicing mode to form an equivalence system of a regional power grid containing an external network detailed model, so that the calculation error of elements near a boundary caused by simple equivalence of the current regional power grid is reduced, and the calculation accuracy of a boundary line model is improved.

Drawings

FIG. 1 is a flow diagram of the present invention.

FIG. 2 is a flow diagram of a landscape side stitching model file management.

FIG. 3 is a flow diagram of a terrain-side stitching model device management.

Fig. 4 is a schematic diagram of the power grid load flow calculation extension splicing method.

FIG. 5 is a functional logic block diagram of the stitching model of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments 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.

Example 1:

as shown in fig. 1 and 5, the power grid load flow calculation extension splicing method of the invention includes the following steps:

s1: and (3) exporting a state estimation result of the provincial dispatching regulation system: the state estimation of the provincial dispatching regulation and control system leads out the calculation result in a period, and a detailed QS file containing model parameters and measurement in the whole network is led out through the provincial dispatching regulation and control system and is issued to a local dispatching;

s2: and (3) local tone side external network equivalent file management: as shown in fig. 2, the method comprises the following small steps:

s21: and (3) state estimation: when the local dispatching state estimation main program integral point saves the section, saving the real-time section from the directory, simultaneously saving the latest external network QS file matched in the directory in a file service mode, and recording the name of the QS file and the provincial dispatching network model time;

s22: acquiring a real-time state estimation section and a real-time state estimation model: when the state estimation real-time section is obtained, automatically obtaining matched QS of the external network, then modeling according to QS files of the internal network and the external network, wherein the measured data of the external network is also in the QS files, and analyzing based on the comprehensive model and the section of the internal network and the external network;

s23: acquiring a historical state estimation section and a model: when a state estimation history section is obtained, obtaining the history section by adopting CaseView and updating a history model matched with the history section, simultaneously obtaining a matched external network equivalent file to a service host of network analysis application by adopting file service, and modeling according to QS files of the internal network and the external network;

s3: splicing a detailed model of the provincial outer net: splicing is carried out according to QS files of the provincial dispatching whole network detailed model and combined with a provincial dispatching local model based on equipment point numbers, and the local dispatching local model is read on the basis of the QS files of the local dispatching whole network detailed model and spliced to form a provincial model and a provincial dispatching model splicing model;

s4: application analysis on the tone side: the method comprises the following steps:

s41: dispatcher trend: the dispatcher trend obtains the internal and external network splicing model by taking the state estimation section operation, so that the simulation operation of the equipment in the territory dispatching modeling range can be supported, the calculation result display is also to filter the external network model, and only the information in the territory dispatching modeling range is displayed; the method supports simulation operation and whole-network load flow calculation of the intra-provincial model based on the local dispatching picture;

s42: static security analysis: and the static security analysis acquires an internal and external network splicing model by taking a state estimation section operation, and devices in a local tone range are set by default to participate in N-1 disconnection and out-of-limit detection.

According to the principle of N-1, the safe operation condition of a system after a single element or a specific element set exits from operation is studied one by one on a certain network section of an operating power system or a research state, whether equipment overload and bus voltage out-of-limit occur or not is verified, and the method is also called N-1 scanning. Setting operation is carried out under a given (or assumed) operation mode, the operation mode is changed, and the power flow analysis and power flow calculation characteristics of the system are analyzed.

Preferably, the provincial regulation and control system of step S1 is built-in with a QS file export service program, wherein: the QS file comprises parameters and measurement of all 220kV equipment of the provincial dispatching power grid, the QS file is issued to a provincial dispatching area according to the period, the provincial dispatching is stored in a default directory and comprises model modeling time.

Preferably, in step S2, the premise of the equal value of the local tone side outer network is that: the provincial dispatching and all local dispatching systems adopt equipment integrated modeling, and the uniformity and uniqueness of equipment identification in the power grid are guaranteed, so that the provincial dispatching established detailed model is spliced with all local dispatching models by directly utilizing the convenient condition to form a detailed external network equivalent model from a superior power grid to a subordinate power grid.

Preferably, in step S3, the splicing of the detailed models of the provincial external networks in the local power grid includes, as shown in fig. 4 and 5, splicing the models and measurement files of the local power grids of the local provincial power grids to form an equivalent system including the detailed models of the external networks, as shown in fig. 3, including the following steps:

s31: and generating a boundary device table and determining the splicing range of the model. In the process of model splicing, a program searches equipment outside the boundary in the local tone model and equipment on the side in the provincial tone model through equipment information in a boundary equipment table; after the searched equipment is deleted, splicing the rest equipment together to generate a new whole network model;

the boundary device definition table comprises the following contents according to the attribute name: ID. A local dispatching identifier, a provincial dispatching identifier, an identifier of a boundary device in a local dispatching model, a boundary device type, an identifier of a device whose local dispatching side is connected with the boundary device, a type of a device whose local dispatching side is connected with the boundary device, an identifier of a boundary device in a provincial dispatching model, a boundary device type, an identifier of a device whose provincial dispatching side is connected with the boundary device, a type of a device whose provincial dispatching side is connected with the boundary device, and a station identifier of a station where the boundary device is located, as shown in table 1:

table 1: boundary device definition table

S32: receiving QS (quality of service) files issued by provincial dispatches, merging an intranet part and an extranet model of a local model by utilizing a model splitting/merging technology, importing the merged intranet part and the extranet model into a system, and finishing the establishment of a full-network model, wherein the method comprises the following specific steps:

s321: exporting a calculation result of a state estimation period of the provincial dispatching regulation system, exporting detailed QS files containing model parameters and measurement in the whole network through sftp service, and issuing the QS files to local dispatches;

s322: after receiving QS files of provincial dispatching, local dispatching performs model splicing according to boundary lines, and mapping conversion between IDs is required due to the fact that the IDs of local dispatching equipment are inconsistent with the IDs of provincial dispatching equipment;

s323: after conversion, QS files based on province and district two levels are carried out to complete the splicing of the whole network model;

s33: the calculation node scale, the calculation time length, the calculation precision and the convergence condition are comprehensively considered, the combined operation practice of the regional power grids is determined, the data calculation accuracy can meet the grid operation requirement after the regional power grids are expanded by 3-5 layers, and the convergence is greatly improved.

Preferably, in step S33, in order to reduce the number of times that modeling is required for the external expansion of the regional power grid, the modeling time in the QS file issued by the provincial government and the modeling time of the regional power grid are determined in advance, and when both of them are updated, the hierarchical library model is updated again.

Preferably, in step S33, in order to reduce the calculation and analysis time and reduce the number of modeling operations, only extranet measurements in QS files are imported when there is no model change.

The power grid load flow calculation extension splicing model comprises a splicing model, wherein the splicing model is divided into an internal system I, a boundary system B and an external system E, and the power grid load flow calculation extension splicing model comprises the following steps:

an internal system I refers to an area which is required to be kept unchanged in the process of detailed calculation simulation and equivalence or an area concerned;

the boundary system B is used for associating the internal system I with the external system E and updating the hierarchical library in a targeted manner so as to extend the area of the internal system I for calculation and isolation error auxiliary calculation;

the external system E, refers to the area adjacent to and interacting with the internal system I, but which can be replaced by some equivalent network without detailed computation.

The power grid load flow calculation extension splicing model comprises a splicing model, and the power grid load flow calculation extension splicing method is executed when the splicing model is used.

The invention has the beneficial effects that: according to the power grid load flow calculation expansion splicing model and the power grid load flow calculation expansion splicing method, the QS files which are derived from provincial dispatches and contain the whole-network equipment model and the measured QS files are spliced with local models of local dispatching power grids of all regions in a whole-network model splicing mode to form an equivalence system of a regional power grid containing an external network detailed model, so that the calculation error of elements near a boundary caused by simple equivalence of the current regional power grid is reduced, and the calculation accuracy of a boundary line model is improved.

The method can be widely applied to the occasions of power grid load flow calculation.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.