CN103107593A - Circulation analysis system and circulation analysis method of complicated power distribution network loop closing operation - Google Patents

Abstract

The invention relates to a circulation analysis system and a circulation analysis method of complicated power distribution network loop closing operation. The circulation analysis system of the complicated power distribution network loop closing operation comprises a database server and a work station. The database server is connected with an external supervisory control and data acquisition (SCADA) system through a physical isolation device or a firewall and receives scalable vector diagrams of the SCADA system. The work station is connected with an external distribution SCADA (DSCADA) system through the physical isolation device or the firewall. The database server receives system public information models of an external production information management system to export files. The database server is connected with the work station through the network.

Description

Circulation analysis system and analysis method for complex distribution network loop closing operation

technical field

The invention relates to a circulation analysis system and a circulation analysis method for complex distribution network loop closing operation. the

Background technique

With the development of power distribution network, the power supply modes of two-way power supply and multi-power supply power supply in distribution network are increasing day by day, and the increase of contact points has brought great benefits to load transfer. When a certain busbar, switch or feeder needs to be overhauled or fails, the loads powered by multiple power sources on the busbar, switch or feeder can perform load transfer. At present, some power supply companies are also trying to transfer the hot load to other busbars or feeders connected to it through the loop closing operation of 10kV or 380V equipment, so as to realize the load switching without power failure (live loop closing). However, the domestic research on the loop closure of the distribution network for multi-terminal power supply has only started in recent years, and a complete set of theoretical calculation methods and systems for loop closure operations have not been formed. experience to guide. This makes it possible for the switch at one end to trip during the hot load switching process, especially in the case of different partitions. This unpredictability brings great difficulties to the dispatching work. , It will cause power outages for users, affecting the normal production and living electricity consumption of residents. With the increase of power load density, the grid structure is becoming more and more complex, and there are more and more power supplies with dual power sources or even multiple power sources. It has become an inevitable trend to realize load switching without power failure through the operation of closing and disassembling loops. the

Contents of the invention

The purpose of the present invention is to provide a complex distribution network loop closing operation circulation analysis system and analysis method, so as to improve the reliability and power quality of the distribution network operation. the

In order to achieve the above-mentioned purpose, the present invention provides a complex distribution network loop closing operation circulation analysis system, including a database server and a workstation; the database server is connected to an external SCADA system through a physical isolation device or a firewall, and receives scalable data from the SCADA system. Vector diagram; the workstation is connected with the external DSCADA system through a physical isolation device or a firewall; the database server receives the system public information model export file of the external production information management system; the database server is connected with the workstation through a network. the

The above complex distribution network loop closing operation circulation analysis system, wherein, the database server includes a first communication interface, a first database processing module, a PMS system CIM file identification interface processing module, a second communication interface, and a first real-time data processing module , the first network communication processing module and the SVG interface processing module; the first communication interface is connected with the external SCADA system through a physical isolation device or a firewall; the second communication interface is connected with an external DSCADA system through a physical isolation device or a firewall; Described first database processing module is connected with described first communication interface module, obtains the real-time information of external SCADA system; Described first database processing module is connected with described second communication interface module, obtains the real-time information of external DSCADA system; The PMS system CIM file identification interface processing module parses the PMS system CIM export file, the first database processing module is connected with the PMS system CIM file identification interface processing module, and obtains the PMS system covering the main power grid and the distribution network public information model; the SVG interface processing module is connected to the first database processing module, and the SVG interface processing module parses the SCADA export file of SCADA and saves it to the first database processing module; the first database processing module The database processing module is connected to the first real-time data processing module, and is used to provide the first real-time data processing module with the relationship model of the main power grid and the distribution network, and the first real-time data processing module will and the distribution network relationship model, creating a memory space for the real-time data processing of the main power grid and the real-time data processing of the distribution network on the database server; the first database processing module is connected to the workstation; the first real-time data processing module is connected to the The first communication interface is connected, and the actual operation data of the primary equipment of the main power grid is obtained through the first communication interface; the first real-time data processing module is connected with the second communication interface, and the second communication interface is used to Obtain real-time operating data of the primary equipment of the distribution network; the first real-time data processing module is connected to the first network communication module, and the first network communication module obtains real-time data in the internal memory of the first real-time data processing module , and send it to the workstation. the

The above complex distribution network loop closing operation circulation analysis system, wherein, the workstation includes a second network communication processing module, a second real-time data processing module, a second database processing module, a graphics processing module and a calculation and analysis module; the second The network communication processing module is connected to the database server; the second network communication processing module is connected to the second real-time data processing module, and sends the real-time data collected from the database server into the second real-time data The corresponding real-time memory data refresh is performed in the processing module; the second database processing module is connected with the database server to realize the database processing function of the client and the server; the second real-time data processing module communicates with the second database Connect with the database processing module, obtain the relationship model of the main grid and the distribution network, and use the relationship model to create a memory space for the real-time data processing of the main grid and the real-time data processing of the distribution network on the workstation; the graphics processing module Connect with the second real-time data processing module to obtain real-time memory data for graphic display and perform data refresh; the calculation and analysis module is connected to the second real-time data processing module to obtain the required data for analysis and calculation The real-time memory data; the calculation and analysis module is connected with the graphics processing module, and the calculation and analysis results are displayed on the graphical interface through the graphics processing module; the calculation and analysis module is connected with the second database processing module, through The second database processing module acquires calculation equipment parameters and electrical network equipment connection relationship; the graphics processing module acquires the SVG graphic data stored in the database server by connecting with the second database processing module, and The obtained SVG graphic data is displayed. the

Another technical solution provided by the present invention is a method for analyzing the circulation of complex distribution network loop closing operation, including the following steps: the database server analyzes the CIM export file of the PMS system, and obtains the topological connection relationship model of the primary electrical equipment in the PMS system and equipment parameter information, and save this information; the database server performs topology conversion on the obtained topology connection relationship model and equipment parameter information of the primary electrical equipment in the PMS system; the workstation establishes the equipment connection relationship table according to the information after topology conversion, and The above-mentioned equipment connection relationship table is used to generate a calculation model for describing the network structure of the power grid, and the connection branches in the calculation model are simplified; the workstation obtains the SCADA system data through the database server; the workstation performs the main network power flow calculation; the workstation performs the main network Equivalent calculation; the workstation performs load equivalent calculation and network simplification of the local distribution network for the load on the two feeders related to the loop closure operation and the local distribution network composed of the two feeders; Operate the steady-state current and inrush current of the two feeder switch branches involved, and judge whether the loop closing operation can be successful according to the calculation results; the workstation outputs the results. the

The above method for analyzing the circulation of the complex distribution network loop closing operation, wherein the database server automatically creates the equipment object class corresponding to the primary equipment in the CIM file of the PMS system, and analyzes the obtained topological connection relationship of the primary electrical equipment in the PMS system The model and equipment parameter information are stored in the corresponding memory space of the equipment object class and in the commercial database. the

The above method for analyzing the circulation of the complex distribution network loop closing operation, wherein the topology conversion is to perform data structure conversion on the topological connection relationship model and equipment parameter information of the primary electrical equipment in the PMS system obtained through analysis, and to characterize the equipment connection The node numbers of the messages are renumbered. the

The above-mentioned method for analyzing the circulation of the complex distribution network loop closing operation, wherein, when generating the calculation model of the grid structure, the calculation model is first converted for the electrical equipment one by one, and the converted result will include the connection relationship of various electrical primary equipment The actual power network is converted into the resistance, reactance, conductance and susceptance calculation parameters of each power supply branch, and then the connection relationship of each power supply branch is created. the

The above-mentioned method for analyzing the circulation of the loop closing operation of the complex distribution network, wherein the load equivalent calculation method is to first obtain the load quantity of each feeder according to the equipment connection relationship table, and then use the calculation data collected at the switch at the beginning of the feeder The total active power and total reactive power at each moment are divided by the number of loads on this feeder to obtain the equivalent active power and equivalent reactive power values of each load at the calculation moment. the

The above-mentioned loop-closing operation circulation analysis method of the complex distribution network, wherein the calculation method for the simplification of the local distribution network network is to divide each feeder line into two parts. Part, this part of the power distribution network is equivalent to a network model containing resistance, reactance and capacitance, the second part is the part from the pole knife to the end of the feeder, and this part of the power distribution network is also equivalent to a network containing resistance, reactance and capacitance Model. the

In the above-mentioned loop-closing operation circulation analysis method for a complex distribution network, the result information output by the workstation includes: the time of the loop-closing operation, the name of the ring-closing rod knife, the names of the two feeders involved in the loop-closing operation, the name of the loop-closing operation The protection settings of the two feeder switches involved, the steady-state current and impact current value flowing through the two feeder switches involved in the loop closing operation after the loop is closed, and the conclusion on whether the loop can be closed successfully. the

The circulation analysis system and analysis method of the complex distribution network loop closing operation of the present invention improve the reliability and power quality of the distribution network operation. the

Description of drawings

The complex distribution network loop closing operation circulation analysis system and analysis method of the present invention are given by the following embodiments and accompanying drawings. the

Fig. 1 is a structural block diagram of the complex distribution network loop closing operation circulation analysis system of the present invention. the

Fig. 2 is a schematic diagram of the structure of the database server and the workstation in the present invention. the

Fig. 3 is a schematic diagram of two feeders involved in the loop closing operation in the present invention. the

Detailed ways

The complex distribution network loop closure operation circulation analysis system and analysis method of the present invention will be further described in detail below in conjunction with Figures 1 to 3. the

Referring to Fig. 1, the complex distribution network loop closing operation circulation analysis system of the embodiment of the present invention includes a database server 100, a first physical isolation device 200, a second physical isolation device 300 and a workstation 400;

The database server 100 is connected to an external data acquisition and monitoring control (Supervisory Control And Data Acquisition, SCADA) system 500 through the first physical isolation device 200;

The database server 100 is connected with an external power distribution network security monitoring and data acquisition (Security Supervisory Control And Data Acquisition In Distribution System, DSCADA) system 600 through the second physical isolation device 300;

The database server 100 provides an interface for analyzing the export file of the system common information model (Common Information Modal, CIM) of the external production information management system (Power Production Management System, PMS), and receives the export file of the system common information model of the external production information management system 700;

Described database server 100 provides the interface that the scalable vector graphics (Scalable Vector Graphics, SVG) of analytical SCADA system derives a file, receives the scalable vector graphics 800 of the SCADA system that described SCADA system 500 transmits;

The database server 100 is interconnected with the workstation 400 through a network. the

The database server 100 can obtain the real-time collected value of the bus line voltage of the main network, the real-time collected value of the active power at the low-voltage side of the transformer, the real-time collected value of the reactive power at the low-voltage side of the transformer, the real-time collected value of the current of the substation feeder line through the external SCADA system 500, Real-time acquisition value information such as real-time switch status;

The database server 100 can obtain information such as the real-time collected value of the pole-knife state of the 10kV and above voltage level line of the distribution network, the real-time collected value of the active power of the substation feeder line, the real-time collected value of the reactive power of the substation feeder line through the external DSCADA system 600;

The database server 100 can obtain the primary equipment parameters of the main grid and the distribution network with a voltage level of 10kV and above through the PMS system CIM export file 700 and the CIM model representing the connection relationship between the main grid and the distribution network primary equipment;

The database server 100 can obtain the primary main wiring diagram information of the main power grid through the SCADA system SVG export file 800 . the

In this embodiment, the number of database servers 100, workstations 400 and physical isolation devices can be configured according to actual needs. the

Firewalls can be used to replace the physical isolation devices described above. the

2, the database server 100 includes a first communication interface 110, a first database processing module 120, a PMS system CIM file identification interface processing module 130, a second communication interface 140, a first real-time data processing module 150, a first network Communication processing module 160 and SVG interface processing module 170;

The first communication interface 110 is used to connect with the external SCADA system 500, and the first communication interface 110 exists in the form of a protocol library, and the existing interface protocols include the IEC 60870-5-104 agreement, the Nanrui e file agreement and others The expansion interface of the protocol facilitates the expansion of the communication protocol. These interfaces can realize the real-time information interconnection with the SCADA systems of different manufacturers;

Described PMS system CIM file identification interface processing module 130 exists with the form of analysis storehouse, can provide and be used to analyze the PMS system CIM export file of different manufacturers, realize the interconnection with PMS system common information model;

Described SVG interface processing module 170 exists with the form of analysis storehouse, can provide and be used to analyze the SCADA system SVG export file of different manufacturers, realizes interconnection with SCADA system graphics;

Described second communication interface 140 is used for being connected with external DSCADA system 600, and described second communication interface 140 exists with the form of protocol storehouse, and the interface agreement that exists is the expansion interface of IEC 60870-5-104 agreement and other agreements, convenient Expansion of communication protocol, these interfaces can realize real-time information interconnection with DSCADA systems of different manufacturers;

The first database processing module 120 is connected with the first communication interface module 110, and the real-time information obtained from the external SCADA system 500 is transmitted to the first database processing module 120 through the communication interface module 110, and the first The database processing module 120 saves the real-time data of the corresponding moment with a time interval of 5 minutes, so as to form the historical operation data of the main power grid;

The first database processing module 120 is connected with the second communication interface module 140, and the real-time information obtained from the external DSCADA system 600 is transmitted to the first database processing module 120 through the communication interface module 140, and the first The database processing module saves the real-time data of the corresponding time at 5-minute intervals to form the historical operation data of the distribution network;

Described PMS system CIM file identification interface processing module 130 can pass through the mode of file reading, analysis PMS system CIM export file 700, described first database processing module 120 is connected with described PMS system CIM file identification interface processing module 130, with Obtaining the public information model of the PMS system that covers the main grid and the distribution network, and saving the public information model, the public information model includes the relationship model of the main network and distribution network primary equipment connection relationship and equipment parameters;

The SVG interface processing module 170 analyzes the SVG export file 800 of the SCADA, and the result after the analysis is that the system has obtained the graphic information of the SCADA system, such as information such as a primary wiring diagram of a substation, graphic element graphics, etc., through the SVG The interface processing module 170 can reduce the maintenance workload of the user's multiple automation systems, that is, once the graphics are drawn, multiple automation systems share graphics information. The SVG interface processing module 170 is connected to the first database processing module 120, and the parsed Information is saved to the first database processing module 120;

The first database processing module 120 is connected to the first real-time data processing module 150, and is used to provide the first real-time data processing module 150 with the relationship model of the main power grid and the distribution network, and the first real-time data processing module Module 150 will create a memory space for real-time data processing of the main grid and real-time data processing of the distribution network on the database server according to the relationship model of the main grid and the distribution network;

The first real-time data processing module 150 is connected to the second communication interface 140, obtains the real-time operation data of the primary equipment of the distribution network through the second communication interface 140, and performs real-time memory data related to the distribution network data refresh;

The first real-time data processing module 150 is connected with the first network communication module 160, and the first network communication module 160 obtains the real-time data in the internal memory of the first real-time data processing module 150, and sends the real-time data Encapsulate according to the self-defined communication message protocol, and send to the workstation 400 through the local area network. the

Continue to refer to Fig. 2, described workstation 400 comprises the second network communication processing module 410, the second real-time data processing module 420, the second database processing module 430, graphics processing module 440 and computing analysis module 450;

The second network communication processing module 410 is connected to the first network communication processing module 160, and receives the real-time data sent by the first network communication processing module 160;

The second network communication processing module 410 is connected with the second real-time data processing module 420, and sends the real-time data collected from the first network communication processing module 160 into the second real-time data processing module 420 for corresponding processing. Real-time memory data refresh;

The second database processing module 430 is connected to the first database processing module 120 through the network to realize the database processing function of the client/server mode, the first database processing module 120 completes the server-side function of the database processing module, and the second The second database processing module 430 completes the database processing module client function;

The second real-time data processing module 420 is connected with the second database processing module 430 to obtain the relationship model of the main grid and the distribution network, and use the relationship model to create a workstation for real-time data processing and processing of the main grid. The memory space for real-time data processing of distribution network, the memory space for real-time data processing of main power grid and real-time data processing of distribution network on the workstation and the real-time data processing of main power grid and real-time data processing of distribution network on the server The memory space structure and size are the same;

The graphics processing module 440 is connected with the second real-time data processing module 420 to obtain real-time memory data for graphic display and refresh the data at a refresh frequency of 1 second;

The calculation and analysis module 450 is connected with the second real-time data processing module 420 to obtain real-time memory data required for analysis and calculation;

The calculation and analysis module 450 is connected with the graphics processing module 440, and the calculation and analysis results are displayed on the graphical interface by the graphics processing module 440;

The calculation and analysis module 450 is connected to the second database processing module 430, and the calculation equipment parameters and electrical network equipment connection relationship are obtained through the second database processing module 430;

The graphic processing module 440 obtains the SVG graphic data stored in the database server 100 by connecting with the second database processing module 430, and displays the acquired SVG graphic data. The graphic processing module 440 can also edit the graphics, and store the edited graphics data in the database server 100 through the second database processing module 430;

The graphic processing module 440 mainly completes graphic editing, displaying, saving, man-machine interface interaction, picture roaming, and picture zooming functions. the

The complex distribution network loop closure operation circulation analysis method of the embodiment of the present invention comprises the following steps:

Step 1, the database server 100 analyzes the CIM export file of the PMS system, obtains the topological connection relationship model and equipment parameter information of the primary electrical equipment in the PMS system, and saves this information;

The PMS system CIM file identification interface processing module 130 analyzes the PMS system CIM export file to obtain the PMS system main grid and distribution network such as transformers, busbars, loads, tie lines, circuit breakers, isolating switches, line poles, etc. The first database processing module 120 will automatically create an equipment object class corresponding to the primary equipment in the CIM file of the PMS system for the node number of the electrical equipment and electrical equipment parameter information such as voltage level and capacity, and simultaneously store the connection information of the above equipment and electrical equipment Device parameter information is stored in the corresponding memory space of the device object class and in the commercial database;

Step 2, the database server performs topology conversion on the topological connection relationship model and equipment parameter information of the primary electrical equipment in the PMS system obtained in step 1;

Because the PMS system CIM file identification interface processing module 130 analyzes the device object class data structure obtained by analyzing the external PMS system CIM export file, there is a difference with the device object class data structure in the complex distribution network loop closure operation circulation analysis system, It is necessary to convert the data structure, and at the same time, renumber the node numbers representing the connection information of the equipment, that is, perform topology conversion. The topology conversion is completed by the CIM file identification interface processing module 130 of the PMS system. The result after the topology conversion is complex The equipment object class in the distribution network loop closing operation circulation analysis system obtains the electrical equipment connection relationship information and equipment parameter information from the equipment object class in the external PMS system CIM file, and the interface processing module 130 is identified by the PMS system CIM file Pass the device object class information after topology conversion to the first database processing module 120, and store the information in the commercial database by the first database processing module 120;

Step 3, the workstation establishes a device connection relationship table according to the information after topology conversion, and generates a calculation model for describing the grid network structure according to the device connection relationship table, and simplifies the connection branches in the calculation model;

The calculation and analysis module 450 obtains the device object class parameter information and the device object class electrical device node number information through the second database processing module 430, and establishes a device connection relationship table according to the device object class electrical device node number, and according to the device connection The relationship table is used to generate a calculation model for describing the network structure of the power grid. When generating the calculation model of the grid structure, the calculation model is first converted for the electrical equipment one by one. The actual power network is converted into the resistance, reactance, conductance and susceptance calculation parameters of each power supply branch (that is, the calculation model of each electrical equipment, and each electrical equipment needs to be converted into a calculation model when performing system analysis and calculation), and then create the calculation parameters of each power supply branch Connection relationship, in order to reduce the calculation scale of the computing network, improve the computing speed, and reduce the memory consumed by the system program operation, it is necessary to simplify the connection branch in the calculation model, and the connection branch refers to the connection between substations The connection line between the tie line and the substation feeder line to the user, the simplification of the connection branch refers to the calculation of the series and parallel branches, for example, two series branches can be simplified into one branch;

Step 4, the workstation obtains the SCADA system data through the database server;

Before the calculation and analysis module 450 performs the calculation of the main network power flow, it needs to obtain the operating status information of the electrical equipment from the SCADA system at the time of calculation and analysis, such as the active power and reactive power collection information of the low-voltage side of each transformer at a certain moment, each Operating status information of circuit breakers and isolating switches in substations, etc.;

The method for obtaining the operating status information of the electrical equipment of the SCADA system is: the calculation and analysis module 450 proposes an application for obtaining corresponding time data to the second database processing module 430, and the second database processing module 430 submits an application to the first database processing module 120 makes an application, the first database processing module 120 responds to the application, extracts the data stored in the commercial database at the corresponding time, and sends these data to the second database processing module 430 through the network package, and then the second database processing module 430 The second database processing module 430 transfers the data obtained at the corresponding moment to the calculation and analysis module 450;

Step 5, the workstation performs main network power flow calculation;

After the calculation and analysis module 450 performs network simplification and obtains the operation status information of the power grid equipment at the corresponding time of the SCADA system, it starts to calculate the power flow of the main network. The power distribution of the circuit and the distribution of voltage amplitude and phase angle;

The main network power flow calculation adopts the improved Newton-Raphson method, and the main network power flow calculation process is as follows: the simplified main network calculation model is obtained by simplifying step 3, and the main network calculation model is composed of n nodes (branch end points is called a node), a power calculation network composed of m branches, a node admittance matrix is formed according to the main network calculation model, and then the initial value of the voltage of each node is given, and the active power of each node is calculated according to the given initial value of the node voltage The square of the power change value, reactive power change value and node voltage change value, judge whether the maximum value of the square of the active power change value, reactive power change value and voltage change value of each node is less than the calculation error (the error requirement is less than 0.001), if is less than the error, the power flow calculation is completed, and the calculated values of the voltage of each node and the active power and reactive power of each branch are obtained; otherwise, the Jacobian matrix is formed to obtain the iterative correction equation, and the correction equation is solved to obtain the correction value of the voltage. Adding the voltage initial value to the voltage correction value to obtain the initial voltage value of the next iteration, repeating the calculation of the square of the active power change value of each node, the reactive power change value and the node voltage change value and subsequent steps;

Step 6, the workstation performs the equivalent calculation of the main network;

After the calculation and analysis module 450 completes the power flow calculation of the main network, it obtains the voltage value of each node of the main network and the power distribution of each branch. To meet the needs of calculation, the system first performs the equivalent calculation of the main network to form a simplified network model. The result of the equivalent calculation of the main network is to use the network model equivalent for the main network calculation with n nodes and m branches as shown in Figure 3. The two-machine system model shown in Fig. 3 (E _eq1 , X ₁ , R ₁ and E _eq2 , X ₂ , R ₂ parts);

The physical meanings of the symbols in Figure 3 are: E _eq1 : the equivalent power supply potential seen from bus 1 to the main network; E _eq2 : the equivalent power supply potential seen from bus 2 to the main network; R ₁ : from the bus 1 The equivalent resistance of the system seen from the main network; R ₂ : The equivalent resistance of the system seen from the bus 2 to the main network; R ₃ : The distribution line from the beginning of the distribution line 1 to the closing pole k and the user equivalent resistance; R ₄ : the distribution line and the user equivalent resistance from the beginning of the distribution line 2 to the ring-closing pole k; R ₅ : the distance between the ring-closing pole knives and the terminal of the distribution line 1 Distribution line and user equivalent resistance; R ₆ : distribution line and user equivalent resistance from the ring-closing pole to the distribution line 2 terminal; X ₁ : system equivalent seen from bus 1 to main network Reactance; X ₂ : system equivalent reactance seen from bus 2 to the main network; X ₃ : distribution line and user equivalent reactance from the beginning of distribution line 1 to ring closing pole k; X ₄ : from distribution line The distribution line and user equivalent reactance between the beginning of the electric line 2 and the ring-closing pole k; X ₅ : the distribution line and the user equivalent reactance from the ring-closing pole k to the end of the distribution line 1; X ₆ : The equivalent reactance of the distribution line and users between the ring-closing pole k and the end of the distribution line 2; C ₃₁ , C ₃₂ : the distribution line and users from the beginning of the distribution line 1 to the ring-closing pole k, etc. value capacitance; C ₄₁ , C ₄₂ : distribution line and user equivalent capacitance from the beginning of distribution line 2 to ring-closing pole k; C ₅₁ , C ₅₂ : from ring-closing pole k to distribution line 1 The distribution line between the ends and the equivalent capacitance of the user; C ₆₁ , C ₆₂ : the distribution line and the equivalent capacitance of the user between the end of the distribution line 2 from the ring-closing pole k to the end of the distribution line 2;

Step 7, the workstation performs load equivalent and local distribution network network simplification calculations on the loads on the two feeders related to the loop closure operation and the local distribution network composed of the two feeders;

After the calculation and analysis module 450 completes the equivalent calculation of the main network, due to the incompleteness of the load data collection information of the DSCADA system and the need to further simplify the calculation model, the system needs to calculate the loads on the two feeders involved in the circulation calculation and the two loads. The local distribution network composed of three feeders is used for load equivalent and local distribution network network simplification calculation;

When carrying out load equivalence, firstly, the load quantity of each feeder can be obtained according to the equipment connection relationship table created in the process of network simplification in step 3, and then the total active power and total reactive power collected at the switch at the beginning of the feeder at the calculation time By dividing the active power by the number of loads on this feeder, the equivalent active power and equivalent reactive power values at the calculation time of each load can be obtained, so as to realize the equivalent calculation of loads;

When simplifying the local distribution network, each feeder line is divided into two parts. The first part is from the beginning of the feeder to the part between the ring-closing pole and the knife. This part of the distribution network is equivalent to include resistance, reactance and The network model of capacitors (R ₃ , X ₃ , C ₃₁ , and C ₃₂ shown in Figure 3 are equivalent to the first part of a feeder), and the second part is the part from the rod knife to the end of the feeder, which is also distributed The network is equivalent to a network model containing resistance, reactance and capacitance (R ₅ , X ₅ , C ₅₁ , and C ₅₂ shown in Figure 3 are equivalent to the second part of a feeder), thus completing the local distribution network network Simplification;

Step 8: The workstation calculates the steady-state current and inrush current flowing through the two feeder switch branches involved in the loop-closing operation after the loop-closing operation, and judges whether the loop-closing operation can be successful according to the calculation results;

After the calculation and analysis module 450 completes step 7, the local distribution network power flow calculation is performed according to the improved Newton-Raphson method, and the local distribution network power flow calculation will obtain the steady state of the two feeder switch branches involved in the loop closing operation. current and inrush current, according to the steady-state current and inrush current value of the switch branch and the protection setting value of the corresponding switch, it can be judged whether the loop closing operation will cause the two feeder switches involved in the loop closing operation to trip, thereby judging the closing Whether the ring operation can be successful;

Step 9, the workstation outputs the result;

After the calculation and analysis module 450 completes step 8, it will output the calculation result, and the output result information includes: the time of the ring closing operation, the name of the ring closing rod knife, the names of the two feeders involved in the ring closing operation, The protection settings of the two feeder switches involved in the loop closing operation, the steady-state current and impact current value flowing through the two feeder switches involved in the loop closing operation after the loop closing, the conclusion of whether the loop closing can be successful, etc. . the

The circulation analysis system and analysis method of complex distribution network loop closing operation have the following advantages

(1) Small maintenance workload

The system interface processing module provides the IEC 61970 standard CIM interface and SVG interface, which realizes the sharing of model data and graphic data with SCADA, reduces the user's system maintenance workload, and meets the requirements of data integration at the same time:

(2) Fast calculation speed

In the calculation and analysis module, in view of the characteristics of many components and complex structure of the distribution network, the amount of data that needs to be processed in the distribution network power source tracking is huge, so the Multimap container is used for data processing, which improves the calculation speed and search efficiency At the same time, the main network power flow calculation adopts the traditional Newton-Raphson method, LDU decomposition processing method, and uses sparse storage technology to improve the calculation efficiency;

(3) Improvement of equivalent model

The network equivalent of the system includes two parts: the main network equivalent and the distribution network load equivalent. For the main network equivalent, it is considered that for any moment, viewed from a certain load point, the entire system can be equivalent to a two-node system , that is, the load node to be studied is equivalent to the power supply node system obtained by other external systems, and for the load equivalent, it is considered that for any moment, the load is a constant impedance load. Since the R/X ratio of the distribution network is large, Therefore, distributed capacitance should be considered. Practice has proved that the equivalent model of the system is effective, the calculation accuracy is high, and the calculation error is less than 10%;

(4) Topology automatic generation technology

The graphics processing module in the distributed workstation adopts the graphics-model integration technology. After the graphics drawing process is completed and the calculation topology generation function is executed, the system automatically generates a network topology structure for analysis and calculation without cumbersome configuration operations;

(5) Fine calculation analysis and query function

The calculation function of the loop closing and breaking current of the system includes the calculation of the closing and breaking loop current of a specific line at the historical maximum network load moment, the minimum network load moment, any manually selected time in history, and the calculation of the closing and breaking loop simulation operation under real-time operation conditions. The results include: the statistics of the number and probability of the successful combination and unblocking of a specific line within a period of time (only for the daily maximum network load time and the minimum network load time), the list of times when the combination and solution calculation failed, the cause analysis and improvement of the failure Measures, the calculation of the voltage amplitude range, phase angle range, and load rate range of the loop-closing line under real-time operation conditions, the conclusion of whether the loop-closing and loop-closing can be successful, and the method of improvement after failure. The refined calculation and analysis are as follows: The dispatcher provides strong data support for the operation of combining and dissolving the loop. the

Claims (10)

1. a Complicated Distribution Network Loop Closing Operation CIRCULATION ANALYSIS system, is characterized in that, comprises database server and work station;

Described database server is connected with outside SCADA system by physical isolation apparatus or fire compartment wall, the scalable polar plot of reception SCADA system;

Described work station is connected with outside DSCADA system by physical isolation apparatus or fire compartment wall;

Described database server receives the system share information model export of outside Style Product Information Management System;

Described database server is connected with described work station by network.

2. Complicated Distribution Network Loop Closing Operation CIRCULATION ANALYSIS as claimed in claim 1 system, it is characterized in that, described database server comprises the first communication interface, the first database processing module, the PMS CIM of system file identification interface processing module, second communication interface, the first real time data processing module, first network Communications Processor Module and SVG interface processing module;

Described the first communication interface is connected with outside SCADA system by physical isolation apparatus or fire compartment wall;

Described second communication interface is connected with outside DSCADA system by physical isolation apparatus or fire compartment wall;

Described the first database processing module is connected with described the first communication interface modules, obtains the real time information of outside SCADA system;

Described the first database processing module is connected with described second communication interface module, obtains the real time information of outside DSCADA system;

The described PMS CIM of system file identification interface is processed the described PMS of the module parses CIM of system export, described the first database processing module is connected with the described PMS CIM of system file identification interface processing module, obtains the Common Information Model of containing main electrical network and power distribution network of PMS system;

Described SVG interface processing module is connected with described the first database processing module, and described SVG interface is processed the SVG export of the described SCADA of module parses, and is saved to described the first database processing module;

Described the first database processing module is connected with described the first real time data processing module, be used for providing to described the first real time data processing module the relational model of main electrical network and power distribution network, described the first real time data processing module will be according to described main electrical network and power distribution network relational model, the memory headroom that the main electrical network real time data processing on the creation database server and Real-time Electrical Distribution Network Data are processed;

Described the first database processing module is connected with described work station;

Described the first real time data processing module is connected with described the first communication interface, obtains the real-time running data of main electrical network primary equipment by described the first communication interface;

Described the first real time data processing module is connected with described second communication interface, obtains the real-time running data of power distribution network primary equipment by described second communication interface;

Described the first real time data processing module is connected with described first network communication module, and described first network communication module is obtained the real time data in described the first real time data processing module memory, and sends to described work station.

3. Complicated Distribution Network Loop Closing Operation CIRCULATION ANALYSIS as claimed in claim 1 system, it is characterized in that, described work station comprises second network Communications Processor Module, the second real time data processing module, the second database processing module, pattern process module and computation analysis module;

Described second network Communications Processor Module is connected with described database server;

Described second network Communications Processor Module is connected with described the second real time data processing module, and the real time data that will collect from described database server is sent in described the second real time data processing module and carried out corresponding real-time Refresh Data;

Described the second database processing module is connected with described database server, realizes the database processing function of client and server mode;

Described the second real time data processing module is by being connected with described the second database processing module, obtain the relational model of main electrical network and power distribution network, and with the memory headroom that main electrical network real time data processing and Real-time Electrical Distribution Network Data are processed that is used on described relational model building work station;

Described pattern process module is connected with described the second real time data processing module, to obtain the real-time data that show for figure and to carry out data and refresh;

Described computation analysis module is connected with described the second real time data processing module, to obtain for the needed real-time data of analytical calculation;

Described computation analysis module is connected with described pattern process module, by described pattern process module, Calculation results is presented on graphical interfaces;

Described computation analysis module is connected with described the second database processing module, obtains by described the second database processing module and calculates with device parameter and electrical network equipment connecting relation;

Described pattern process module obtains by being connected with described the second database processing module the SVG graph data that is stored in described database server, and the described SVG graph data that will get shows.

4. a Complicated Distribution Network Loop Closing Operation CIRCULATION ANALYSIS method, is characterized in that, comprises the following steps:

Database server is resolved the PMS CIM of system export, obtains topological connection relation model and the device parameter information of an electric equipment in the PMS system, and preserves this information;

Database server carries out topology conversion to topological connection relation model and the device parameter information of an electric equipment in the PMS system that obtains;

The information apparatus for establishing connection relational table of work station after according to topology conversion, and generate the computation model that is used for describing the electrical network network configuration according to described equipment connecting relation table, and carry out abbreviation to connecting branch road in described computation model;

Work station obtains the SCADA system data by database server;

Work station carries out the major network trend and calculates;

Work station carries out the major network equivalent calculation;

Load equivalence and local power distribution network network abbreviation of the local distribution network that load on relevant two feeder lines of work station involutive ring operation and two feeder lines form calculates;

Work station calculates steady-state current and the impulse current that flows through two feeder switch branch roads that Loop Closing Operation relates to after cyclization, and judges according to result of calculation whether Loop Closing Operation can be successful;

Work station is exported result.

5. Complicated Distribution Network Loop Closing Operation CIRCULATION ANALYSIS method as claimed in claim 4, it is characterized in that, database server automatically creates the device object class corresponding with primary equipment in the PMS CIM of system file, and will resolve the topological connection relation model of an electric equipment in the described PMS system of acquisition and device parameter information and be stored in the corresponding memory headroom of corresponding device object class and reach in commercial data base.

6. Complicated Distribution Network Loop Closing Operation CIRCULATION ANALYSIS method as claimed in claim 5, it is characterized in that, described topology conversion is that topological connection relation model and the device parameter information of an electric equipment in the described PMS system that resolve to obtain are carried out the data structure conversion, and the node serial number that characterizes equipment connection information is renumberd.

7. Complicated Distribution Network Loop Closing Operation CIRCULATION ANALYSIS method as claimed in claim 4, it is characterized in that, when generating the computation model of described electric network composition, first electric equipment is carried out the conversion of computation model one by one, result after conversion be will include the actual electric power network switch of various electric primary equipment annexations become respectively to power resistance, reactance, the electricity of branch road lead and the susceptance calculating parameter, then create the annexation of the branch road of respectively powering.

8. Complicated Distribution Network Loop Closing Operation CIRCULATION ANALYSIS method as claimed in claim 6, it is characterized in that, the computational methods of load equivalence are, first obtain the load quantity of every feeder line according to described equipment connecting relation table, then be used in calculating that the switch place at feeder line top collects constantly total active power and total reactive power divided by the load quantity on this feeder line, obtain calculating equivalent active power and the equivalent reactive power value constantly of each load.

9. Complicated Distribution Network Loop Closing Operation CIRCULATION ANALYSIS method as claimed in claim 6, it is characterized in that, the computational methods of local power distribution network network abbreviation are, every feeder line is divided into two parts, first is from feeder line top to part cyclization bar cutter, this part distribution network equivalence is become to contain the network model of resistance, reactance and electric capacity, second portion is that the bar cutter is to the feeder terminal part, equally with the equivalent network model that becomes to contain resistance, reactance and electric capacity of this part distribution network.

10. Complicated Distribution Network Loop Closing Operation CIRCULATION ANALYSIS method as claimed in claim 6; can it is characterized in that, the object information of work station output comprises: the steady-state current of two the involved feeder switches of Loop Closing Operation of flowing through after the protection definite value of two feeder switches that title, the Loop Closing Operation of two feeder lines that title, the Loop Closing Operation of the time of Loop Closing Operation, cyclization bar cutter is involved is involved, cyclization and impulse current value, conclusion that the cyclization success.

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