An electrical secondary integrated design calculation and verification platform

Abstract

An electrical secondary integrated design calculation and verification platform includes a data layer, a business logic layer and an interface layer; the data layer is divided into basic database management, equipment library management and engineering library management; among them, basic database management includes DC load data, UPS load data and transformer load data management; equipment library management includes cable model specification library, 4 DC circuit breaker model libraries, 12 battery parameter libraries and 6 transformer parameter libraries; engineering library management includes design calculation and verification called by typical projects; in the business layer, the platform includes four major calculation and verification module groups, including DC power supply system selection calculation, UPS and matching battery selection calculation, transformer selection verification and DC power supply level difference coordination verification. The present invention develops an electrical secondary integrated design calculation and verification platform, develops the software platform from the aspects of system architecture, system management, system function and system process, and solves the interconnection and interoperability of electrical secondary calculation and verification software.

Description

Technical Field

[0001] The invention relates to an electrical secondary integrated design calculation and verification platform. Background Art

[0002] The secondary system in the substation is large in scale, and the protection configuration and CT circuit are relatively complex. During the test, problems such as reverse CT polarity and wrong transformation ratio often occur, which has an adverse impact on the debugging progress and quality.

[0003] During the on-site commissioning of the substation secondary system, the correctness of the circuit is usually ensured by checking the wiring, testing the loop resistance and the point CT polarity. However, the above methods are indirect testing methods, and multiple test results need to be verified to draw the final test conclusion. Moreover, it is impossible to reliably detect whether the CT ratio is correct, whether the cable is grounded, or whether there is a parasitic circuit that generates shunts.

[0004] Therefore, during the design process, it is usually necessary to select and calculate the secondary equipment, including the DC power supply system, UPS power supply capacity and supporting batteries, transformers, DC power supply level difference coordination verification modules, etc. However, in the existing designs, there is no platform that can perform comprehensive design and verification. Summary of the invention

[0005] The technical problem to be solved by the present invention is: how to perform design calculation and verification on all secondary equipment. Therefore, the present invention provides an electrical secondary integrated design calculation and verification platform.

[0006] To achieve the above object, the present invention is achieved through the following technical solutions:

[0007] An electrical secondary integrated design calculation and verification platform includes a data layer, a business logic layer and an interface layer; the data layer is divided into basic database management, equipment library management and engineering library management; among them, basic database management includes DC load data, UPS load data and transformer load data management; equipment library management includes cable model specification library, 4 DC circuit breaker model libraries, 12 battery parameter libraries and 6 transformer parameter libraries; engineering library management includes design calculation and verification called by typical projects;

[0008] At the business layer, the platform includes four major calculation and verification module groups: DC power system selection calculation, UPS and supporting battery selection calculation, transformer selection verification, and DC power supply level difference coordination verification.

[0009] The DC power supply system selects the calculation module calculation process, including the following steps:

[0010] Step 1.1: Add load current statistics record;

[0011] Step 1.2: Input relevant parameters on the interface to determine whether the input parameters meet the calculation conditions; if not, continue to input parameters to determine whether the calculation conditions are met; if the calculation conditions are met, directly proceed to step 1.3:

[0012] Step 1.3: Use the step load method or IEEE step table method to calculate the DC battery;

[0013] Step 1.4: Calculate the charging device based on the capacity of the battery calculated in step 1.3;

[0014] Step 1.5: Draw a step load diagram based on the calculation results of step 1.4;

[0015] Step 1.6: Export calculation books of both domestic and foreign standards.

[0016] The calculation process of the UPS power capacity and matching battery selection calculation module includes the following steps:

[0017] Step 2.1, determine the wiring method of the UPS, commercial or industrial grade;

[0018] Step 2.2: Input the parameters for UPS calculation: including load, load rate, altitude, comprehensive power factor, etc. You can also call the typical project module;

[0019] Step 2.3: Use the embedded template to count the load;

[0020] Step 2.4: Calculate the load and comprehensive power factor;

[0021] Step 2.5: Calculate the calculated capacity. If the capacity does not meet the requirements, return to the input parameters for correction and finally determine the rated capacity;

[0022] Step 2.6: Use an independent battery and select a calculation method for an independent battery from the constant power method, step load method, power supply method, and constant current method for calculation; in the constant power method, input the termination voltage and discharge time, calculate the number of batteries and the single power Pnc, check the constant power parameter table and determine the capacity and grouping; in the step load method, select the battery parameters and calculate the capacity based on the load statistics; in the power supply method, calculate the discharge current and calculate the capacity based on the capacity conversion factor, etc.; in the constant current method, calculate the discharge current and check the constant current parameter table to determine the capacity and grouping.

[0023] The transformer selection and verification module process includes the following steps:

[0024] Step 3.1: Read database data;

[0025] Step 3.2: Determine the engineering information data and judge whether the engineering information data is reused;

[0026] Step 3.3: Select the secondary rated current. If it meets the requirements, proceed to the next stage of PT selection verification or CT selection verification calculation. If it does not meet the requirements, re-enter the data;

[0027] Step 3.4: Enter CT calibration and select one or more of measurement / metering, P-level protection, TPY-level selection calibration, and PX selection calibration for calculation;

[0028] Step 3.5: In the TPY level selection verification, select one of the two modes, C-0-C-0 cycle and C-0 cycle, for calculation. If the capacity does not meet the requirements, return to the input parameters for correction;

[0029] Step 3.6: During PT calibration, enter the PT calculation parameters and perform the calculation.

[0030] Step 3.7: End the calculation, export the calculation report, and complete all tasks.

[0031] The DC power supply differential coordination verification module verification process includes the following steps:

[0032] Step 4.1: Determine the project information data, input the load feeder circuit breaker selection parameters, battery related parameters, cable selection parameters and verify;

[0033] Step 4.2: Select the calculation type in Load Feeder Circuit Selection and Verification, Cable Selection and Verification;

[0034] Step 4.3: In the load feeder circuit selection, enter the battery related parameters and select the centralized radial feeder circuit or the split-screen radial feeder circuit;

[0035] Step 4.4: Carry out full circuit calculation, short-circuit current calculation, and then perform range matching check and sensitivity check;

[0036] Step 4.5: After the calculation is qualified, the calculation report is exported. If it is not qualified, adjust the cable selection and recalculate until the requirements are met.

[0037] Compared with the prior art, the present invention has the following beneficial effects: the present invention develops an electrical secondary integrated design calculation and verification platform, develops the software platform from the aspects of system architecture, system management, system function and system process, and solves the interconnection and interoperability of electrical secondary calculation and verification software. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a system structure diagram of the present invention;

[0039] Figure 2 The system management architecture of the present invention;

[0040] Figure 3 Select the calculation module calculation flow chart for the DC power system;

[0041] Figure 4 Calculation flow chart for selecting calculation module for UPS power capacity and supporting battery;

[0042] Figure 5 Flowchart for selecting calibration module for transformer;

[0043] Figure 6 This is the calibration flow chart of the DC power supply differential coordination calibration module. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0046] like Figure 1 As shown in the figure, an electrical secondary integrated design calculation and verification platform is adopted. Considering the convenience, response speed and reaction sensitivity, the platform adopts the MVC mode three-tier architecture, the front end adopts the WinForm interface of C#.NET, and the database adopts the Access database. The application architecture of the software platform is mainly composed of three systems: data management, system design and system verification. Among them, the data management application realizes the data management application by interacting with the data server, and the system design and system verification application completes the data entry, calculation and verification applications by interacting with the user. The application mode consists of three layers, namely DAL, BIL and UIL, which represent the data layer, business logic layer and interface layer (UI layer) respectively. The main program is divided into the basic layer, data layer, logic layer and display layer. The design architecture realizes the low coupling degree of the module, the program has a good human-computer interaction interface, parameterized and visualized input, and all functions are operated by command buttons and menus. It is easy to use, saves calculation and statistics time, and effectively improves design efficiency.

[0047] like Figure 2 As shown in the figure, according to the application mode of the platform, the data layer in the platform system is divided into basic database management, equipment library management, and engineering library management. Among them, the basic database management includes DC load data, UPS load data, and transformer load data management. The equipment library management includes cable model specification library, 4 DC circuit breaker model libraries, 12 battery parameter libraries, and 6 transformer parameter libraries; the engineering library management includes the design calculation and verification of typical engineering calls.

[0048] At the business layer, the platform includes four major calculation and verification module groups: DC power system selection calculation, UPS and supporting battery selection calculation, transformer selection verification, and DC power supply differential coordination verification. The calculation process of each module group is as follows.

[0049] like Figure 3 As shown in FIG. 1 , the DC power system selects the calculation module calculation process, including the following steps:

[0050] Step 1.1: Add load current statistics record;

[0051] Step 1.2: Input relevant parameters on the interface to determine whether the input parameters meet the calculation conditions; if not, continue to input parameters to determine whether the calculation conditions are met; if the calculation conditions are met, directly proceed to step 1.3:

[0052] Step 1.3: Use the step load method or IEEE step table method to calculate the DC battery;

[0053] Step 1.4: Calculate the charging device based on the capacity of the battery calculated in step 1.3;

[0054] Step 1.5: Draw a step load diagram based on the calculation results of step 1.4;

[0055] Step 1.6: Export calculation books of both domestic and foreign standards.

[0056] like Figure 4 As shown in the figure, the calculation process of the UPS power capacity and matching battery selection calculation module includes the following steps:

[0057] Step 2.1, determine the wiring method of the UPS, commercial or industrial grade;

[0058] Step 2.2: Input the parameters for UPS calculation: including load, load rate, altitude, comprehensive power factor, etc. You can also call the typical project module;

[0059] Step 2.3: Use the embedded template to count the load;

[0060] Step 2.4: Calculate the load and comprehensive power factor;

[0061] Step 2.5: Calculate the calculated capacity. If the capacity does not meet the requirements, return to the input parameters for correction and finally determine the rated capacity;

[0062] Step 2.6: Use an independent battery and select a calculation method for an independent battery from the constant power method, step load method, power supply method, and constant current method for calculation; in the constant power method, input the termination voltage and discharge time, calculate the number of batteries and the single power Pnc, check the constant power parameter table and determine the capacity and grouping; in the step load method, select the battery parameters and calculate the capacity based on the load statistics; in the power supply method, calculate the discharge current and calculate the capacity based on the capacity conversion factor, etc.; in the constant current method, calculate the discharge current and check the constant current parameter table to determine the capacity and grouping.

[0063] like Figure 5 As shown, the transformer selection and verification module process includes the following steps:

[0064] Step 3.1: Read database data;

[0065] Step 3.2: Determine the engineering information data and judge whether the engineering information data is reused;

[0066] Step 3.3: Select the secondary rated current. If it meets the requirements, proceed to the next stage of PT selection verification or CT selection verification calculation. If it does not meet the requirements, re-enter the data;

[0067] Step 3.4: Enter CT calibration and select one or more of measurement / metering, P-level protection, TPY-level selection calibration, and PX selection calibration for calculation;

[0068] Step 3.5: In the TPY level selection verification, select one of the two modes, C-0-C-0 cycle and C-0 cycle, for calculation. If the capacity does not meet the requirements, return to the input parameters for correction;

[0069] Step 3.6: During PT calibration, enter the PT calculation parameters and perform the calculation.

[0070] Step 3.7: End the calculation, export the calculation report, and complete all tasks.

[0071] like Figure 6 As shown, the DC power supply differential coordination verification module verification process includes the following steps:

[0072] Step 4.1: Determine the project information data, input the load feeder circuit breaker selection parameters, battery related parameters, cable selection parameters and verify;

[0073] Step 4.2: Select the calculation type in Load Feeder Circuit Selection and Verification, Cable Selection and Verification;

[0074] Step 4.3: In the load feeder circuit selection, enter the battery related parameters and select the centralized radial feeder circuit or the split-screen radial feeder circuit;

[0075] Step 4.4: Carry out full circuit calculation, short-circuit current calculation, and then perform range matching check and sensitivity check;

[0076] Step 4.5: After the calculation is qualified, the calculation report is exported. If it is not qualified, adjust the cable selection and recalculate until the requirements are met.

[0077] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several changes and improvements can be made without departing from the overall concept of the present invention, which should also be regarded as the scope of protection of the present invention.

Claims

1. An electrical secondary integrated design calculation and verification platform, characterized by: It includes data layer, business logic layer and interface layer; the data layer is divided into basic database management, equipment library management and engineering library management; among them, basic database management includes DC load data, UPS load data and transformer load data management; equipment library management includes cable model specification library, 4 DC circuit breaker model libraries, 12 battery parameter libraries and 6 transformer parameter libraries; engineering library management includes design calculation and verification of typical engineering calls; At the business level, the platform includes four major calculation and verification module groups: DC power system selection calculation, UPS and supporting battery selection calculation, transformer selection verification, and DC power differential coordination verification; The DC power supply system selects the calculation module calculation process, including the following steps: Step 1.1: Add load current statistics record; Step 1.2: Input relevant parameters on the interface to determine whether the input parameters meet the calculation conditions; if not, continue to input parameters to determine whether the calculation conditions are met; if the calculation conditions are met, directly proceed to step 1.3: Step 1.3: Use the step load method or IEEE step table method to calculate the DC battery; Step 1.4: Calculate the charging device based on the capacity of the battery calculated in step 1.3; Step 1.5: Draw a step load diagram based on the calculation results of step 1.4; Step 1.6: Export calculation books of both domestic and foreign standards.

2. The electrical secondary integrated design calculation and verification platform according to claim 1, characterized in that: The calculation process of the UPS power capacity and matching battery selection calculation module includes the following steps: Step 2.1, determine the wiring method of the UPS, commercial or industrial grade; Step 2.2: Input the parameters for UPS calculation: including load, load rate, altitude, comprehensive power factor, or call the typical project module; Step 2.3: Use the embedded template to count the load; Step 2.4: Calculate the load and comprehensive power factor; Step 2.5: Calculate the calculated capacity. If the capacity does not meet the requirements, return to the input parameters for correction and finally determine the rated capacity; Step 2.6: Use an independent battery and select a calculation method for an independent battery from the constant power method, step load method, power supply method, and constant current method for calculation; in the constant power method, input the termination voltage and discharge time, calculate the number of batteries and the single power Pnc, check the constant power parameter table and determine the capacity and grouping; in the step load method, select the battery parameters and calculate the capacity based on the load statistics; in the power supply method, calculate the discharge current and calculate the capacity based on the capacity conversion factor; in the constant current method, calculate the discharge current and check the constant current parameter table to determine the capacity and grouping.

3. The electrical secondary integrated design calculation and verification platform according to claim 1 is characterized by: The transformer selection and verification module process includes the following steps: Step 3.1: Read database data; Step 3.2: Determine the engineering information data and judge whether the engineering information data is reused; Step 3.3: Select the secondary rated current. If it meets the requirements, proceed to the next stage of PT selection verification or CT selection verification calculation. If it does not meet the requirements, re-enter the data; Step 3.4: Enter CT calibration and select one or more of measurement / metering, P-level protection, TPY-level selection calibration, and PX selection calibration for calculation; Step 3.5: In the TPY level selection verification, select one of the two modes, C-0-C-0 cycle and C-0 cycle, for calculation. If the capacity does not meet the requirements, return to the input parameters for correction; Step 3.6: During PT calibration, enter the PT calculation parameters and perform the calculation. Step 3.7: End the calculation, export the calculation report, and complete all tasks.

4. The electrical secondary integrated design calculation and verification platform according to claim 1, characterized in that: The DC power supply differential coordination verification module verification process includes the following steps: Step 4.1: Determine the project information data, input the load feeder circuit breaker selection parameters, battery related parameters, cable selection parameters and verify; Step 4.2: Select the calculation type in Load Feeder Circuit Selection and Verification, Cable Selection and Verification; Step 4.3: In the load feeder circuit selection, enter the battery related parameters and select the centralized radial feeder circuit or the split-screen radial feeder circuit; Step 4.4: Carry out full circuit calculation, short-circuit current calculation, and then perform range matching check and sensitivity check; Step 4.5: After the calculation is qualified, the calculation report is exported. If it is not qualified, adjust the cable selection and recalculate until the requirements are met.

Images