CN111797524B - Full-automatic optimization design method for electromagnetic operating mechanism of circuit breaker - Google Patents

Abstract

The invention relates to the technical field of breaker electromagnetic operating mechanisms, in particular to a full-automatic optimization design method of a breaker electromagnetic operating mechanism based on Matlab and Maxwell. In the traditional design process of the operating mechanism, a designer sets the change rule of simulation parameters to be rigid, needs to continuously and manually adjust structural parameters, and can design the operating mechanism meeting the requirements of the circuit breaker by combining years of design experience. The invention can realize the full-automatic rapid design and parameter optimization of the electromagnetic operating mechanism of the circuit breaker, and simultaneously can provide a plurality of groups of optimized design schemes for designers to select, thereby ensuring the full automation, rapidity and high reliability of the design of the electromagnetic operating mechanism of the circuit breaker.

Description

A fully automatic optimization design method of electromagnetic operating mechanism of circuit breaker

technical field

The invention relates to the technical field of an electromagnetic operating mechanism of a circuit breaker, in particular to a fully automatic optimization design method of an electromagnetic operating mechanism of a circuit breaker based on Matlab and Maxwell.

Background technique

In recent years, with the large-scale access of distributed power sources and energy storage devices, the rapid development of power electronics technology, and the growth of electricity load, the rapid breaking capability of circuit breakers has attracted more and more attention. Especially in some specific occasions, such as large ship power supply system, photovoltaic DC micro-grid system, urban rail transit power supply system and other DC systems have been developed by leaps and bounds. With the continuous growth of the power system capacity and the continuous improvement of the voltage level, the indicators of the short-circuit current peak value and the breaking time of the circuit breaker are also constantly improving. Although the traditional spring-type mechanical circuit breaker has the advantages of strong load capacity and stable conduction, the response speed is slow, generally in the order of tens of milliseconds, which cannot meet the requirements of fast breaking action in the power system; the response speed of power electronic switches fast, but its on-state loss is too large and its withstand voltage capability is low. Therefore, designing a quick-acting, economical and environmentally friendly circuit breaker that meets the requirements of the current power system is the key to building a future power system and protecting its safe and stable operation.

At present, most of the quick-break circuit breakers use electromagnetic mechanisms, and the design steps of mechanisms and driving circuits are complicated. First, the designer needs to manually calculate the parameters of the operating mechanism, and then establish a Maxwell simulation model, and obtain the output and motion characteristics of the electromagnetic mechanism through the simulation model. If the simulation results do not meet the design requirements, the model parameters are continuously revised until the simulation results satisfy Design requirements. Disadvantages of the prior art: 1) The method of continuously manually changing the model parameters is used to obtain a design that meets the requirements, which is less flexible and time-consuming and labor-intensive. 2) The electromagnetic operating mechanism has many variable parameters, which leads to the fact that the circuit breaker operating mechanism actually designed by the designer is not an optimal design. 3) To establish a complete electromagnetic simulation analysis of electromagnetic operating mechanism in Maxwell and other electromagnetic analysis and simulation software based on finite element, the calculation burden is heavy, and the variation law of setting simulation parameters is relatively rigid, and designers need to combine years of design experience to be able to Design an operating mechanism that meets the requirements of the circuit breaker. Such a design process of the electromagnetic operating mechanism of a circuit breaker is not conducive to the rapid prototyping and optimization of circuit breaker products, and seriously affects the development and use of circuit breakers.

SUMMARY OF THE INVENTION

The embodiment of the present invention provides a fully automatic optimization design method for the electromagnetic operating mechanism of the circuit breaker, which can realize the automatic and rapid design and parameter optimization of the operating mechanism of the circuit breaker, and can provide multiple groups of optimal design solutions for the designer to choose. The high reliability of the circuit breaker operating mechanism is guaranteed.

Technical solutions

In a first aspect, an embodiment of the present invention provides a fully automatic optimization design method for an electromagnetic operating mechanism of a circuit breaker, including the following steps:

Step 1: According to the engineering requirements of the designed circuit breaker, select the electromagnetic operating mechanism scheme;

Step 2: According to the electromagnetic operating mechanism scheme, create a new project in Maxwell, enable the recording script function, define the shape, material and structure of the electromagnetic operating mechanism that meets the circuit breaker stroke, and establish a complete electromagnetic operating mechanism model , the electromagnetic operating mechanism model includes an electromagnetic holding part, an electromagnetic output part and an output shaft;

Step 3: Add an excitation external circuit to the coil of the electromagnetic output part of the electromagnetic operating mechanism model, and set the capacitance value of the discharge capacitor and the charging voltage amplitude in the external excitation circuit, close the Maxwell software, and generate the electromagnetic operation. The script file of the dynamic mechanism model;

Step 4: Open the Matlab software, call the script language conversion program, and convert the script file of the electromagnetic operating mechanism model into the subprogram 1 of the m language;

Step 5: run the main program written by Matlab, realize the automatic sequence call of the subroutine 1 and the intelligent optimization algorithm subroutine 2, the main program written by the Matlab automatically opens the Maxwell software, automatically calls the shape of the electromagnetic operating mechanism, Material and structure, automatically add the capacitance value and charging voltage amplitude of the discharge capacitor in the excitation external circuit, and run the simulation calculation function to obtain the output and motion data of the electromagnetic operating mechanism model, and save the data of each change. The simulation calculation results after describing the shape, material and structural parameters of the electromagnetic operating mechanism;

Step 6: The Matlab main program automatically screens the simulation calculation results according to the breaking time and travel parameter requirements of the electromagnetic operating mechanism required by the circuit breaker, and outputs the optimized results that meet the requirements.

Further, the fully automatic optimization design method of the electromagnetic operating mechanism of the circuit breaker is characterized in that the main program written by the Matlab comprises an initialization module, a simulation model component structure parameter numerical value generation module, a subroutine calling module, Simulation results report generation and output module.

Further, the fully automatic optimization design method of the electromagnetic operating mechanism of the circuit breaker is characterized in that the optimization of the step 5 is realized in two steps, firstly optimizing the electromagnetic holding part of the electromagnetic operating mechanism, Then, the electromagnetic output part is optimized without changing the optimization result of the electromagnetic holding part.

Further, the described method for fully automatic optimization and design of an electromagnetic operating mechanism of a circuit breaker is characterized in that the intelligent optimization algorithm subroutine 2 is an artificial intelligence optimization algorithm.

Further, the fully automatic optimization design method for an electromagnetic operating mechanism of a circuit breaker is characterized in that the optimization results that meet the requirements are output through an Excel table.

The embodiment of the present invention provides an optimal design method for the electromagnetic operating mechanism of a circuit breaker, which is fully automatic, simple in method, and high in reliability, which can realize the fully automatic and rapid design and parameter optimization of the operating mechanism of the circuit breaker, and at the same time, can Provide multiple groups of optimized design solutions for designers to choose, which ensures the high reliability of the circuit breaker operating mechanism. In addition, the method improves the flexibility of simulation calculation and saves a lot of labor cost and time cost. The implementation method is simple, and the modules in the main program based on Matlab are well organized, which is easy for researchers to debug, maintain and re-develop.

Description of drawings

Fig. 1 is a specific flow chart of a fully automatic optimization design method for an electromagnetic operating mechanism of a circuit breaker.

Fig. 2 is a schematic diagram of a two-dimensional rotational axis-symmetric cross-sectional view of an electromagnetic operating mechanism;

Fig. 3 is a schematic diagram of the external circuit of the coil excitation of the electromagnetic operating mechanism;

Description of reference numbers:

1. Output shaft 2. Output part 3. Holding part

Detailed ways:

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, the drawings only show some but not all structures related to the present invention.

The present invention provides a fully automatic optimization design method for an electromagnetic operating mechanism of a circuit breaker. As an example, a two-dimensional axisymmetric structure diagram of an electromagnetic operating mechanism rotating in Maxwell is shown in Figure 2. It consists of three parts, including output Shaft, output part and holding part, other electromagnetic operating mechanism modeling methods are the same as this example. The external circuit excitation of the output coil of the operating mechanism is shown in Figure 3. The coil L represents the output coil, and the resistance R1 is the output coil resistance. By controlling the conduction of VT1, the capacitor discharges the output coil, thereby generating electromagnetic force. The patent of the present invention can realize the fully automatic optimization design of the electromagnetic operating mechanism of the circuit breaker, and the specific steps are as follows:

Step 1: According to the engineering requirements of the designed circuit breaker, select the electromagnetic operating mechanism scheme;

Step 2: According to the electromagnetic operating mechanism scheme, create a new project in Maxwell, enable the recording script function, define the shape, material and structure of the electromagnetic operating mechanism that meets the circuit breaker stroke, and establish a complete electromagnetic operating mechanism model , the electromagnetic operating mechanism model includes an electromagnetic holding part, an electromagnetic output part and an output shaft;

Step 3: Add an excitation external circuit to the coil of the electromagnetic output part of the electromagnetic operating mechanism model, and set the capacitance value of the discharge capacitor and the charging voltage amplitude in the external excitation circuit, close the Maxwell software, and generate the electromagnetic operation. The script file of the dynamic mechanism model;

Step 4: Open the Matlab software, call the script language conversion program, and convert the script file of the electromagnetic operating mechanism model into the subprogram 1 of the m language;

Step 5: run the main program written by Matlab, realize the automatic sequence call of the subroutine 1 and the intelligent optimization algorithm subroutine 2, the main program written by the Matlab automatically opens the Maxwell software, and automatically calls the shape of the electromagnetic operating mechanism, Material and structure, automatically add the capacitance value and charging voltage amplitude of the discharge capacitor in the excitation external circuit, and run the simulation calculation function to obtain the output and motion data of the electromagnetic operating mechanism model, and save the data of each change. The simulation calculation results after describing the shape, material and structural parameters of the electromagnetic operating mechanism;

Step 6: The Matlab main program automatically screens the simulation calculation results according to the breaking time and travel parameter requirements of the electromagnetic operating mechanism required by the circuit breaker, and outputs the optimized results that meet the requirements.

Further, the Matlab main program in step 5 includes an initialization module, a simulation model component structure parameter numerical value generation module, a subroutine calling module, and a simulation result report generation and export module.

Further, the optimization of step 5 is implemented in two steps, firstly optimizing the electromagnetic holding part of the electromagnetic operating mechanism, and then optimizing the electromagnetic output part without changing the optimization result of the electromagnetic holding part.

Further, in step 5, the intelligent optimization algorithm subroutine 2 is an artificial intelligence optimization algorithm, and the artificial intelligence optimization algorithm is preferably a gradient optimization algorithm or a gradient-free optimization algorithm. This application does not limit the artificial intelligence optimization algorithm.

Further, the designer can select the final operating mechanism design scheme according to the Excel optimization result table, and then process and produce the operating mechanism after the scheme is determined. So far, the automatic design of the electromagnetic mechanism of the circuit breaker has been completed.

Note that the above are only preferred embodiments of the present invention and applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present invention. The scope is determined by the scope of the appended claims.

Claims (5)

1. A full-automatic optimization design method for an electromagnetic operating mechanism of a circuit breaker is characterized by comprising the following steps:

step 1: selecting an electromagnetic operating mechanism scheme according to the engineering requirements of the designed circuit breaker;

step 2: according to the scheme of the electromagnetic operating mechanism, a project is newly built in Maxwell, a script recording function is started, the shape, the material and the structure of the electromagnetic operating mechanism which meet the stroke of a circuit breaker are defined, and a complete electromagnetic operating mechanism model is built, wherein the electromagnetic operating mechanism model comprises an electromagnetic holding part, an electromagnetic force output part and an output shaft;

and step 3: adding an excitation external circuit for a coil of an electromagnetic force output part of the electromagnetic operating mechanism model, setting a capacitance value and a charging voltage amplitude of a discharging capacitor in the excitation external circuit, closing Maxwell software, and generating a script file of the electromagnetic operating mechanism model;

and 4, step 4: opening Matlab software, calling a script language conversion program, and converting a script file of the electromagnetic operating mechanism model into a subprogram 1 of m language;

and 5: running a main program compiled by Matlab, realizing automatic sequential calling of the subprogram 1 and an intelligent optimization algorithm subprogram 2, automatically opening Maxwell software by the main program compiled by Matlab, automatically calling the shape, the material and the structure of the electromagnetic operating mechanism, automatically adding the capacitance value and the charging voltage amplitude of a discharge capacitor in an excitation external circuit, running a simulation calculation function, obtaining the output and motion data of the electromagnetic operating mechanism model, and storing the simulation calculation result after the shape, the material and the structure parameters of the electromagnetic operating mechanism are changed each time;

step 6: and the Matlab main program automatically screens the simulation calculation result according to the on-off time and the stroke parameter requirements of the electromagnetic operating mechanism required by the circuit breaker, and outputs the optimization result meeting the requirements.

2. The method for fully automatically optimizing and designing the electromagnetic operating mechanism of the circuit breaker according to claim 1, wherein the main program written by Matlab comprises an initialization module, a simulation model component structure parameter value generation module, a subprogram calling module and a simulation result report generation and output module.

3. The method for fully automatically optimizing and designing the electromagnetic operating mechanism of the circuit breaker according to claim 1, wherein the optimization of the step 5 is implemented in two steps, namely, firstly, the electromagnetic maintaining part of the electromagnetic operating mechanism is optimized, and then the electromagnetic force output part is optimized under the condition that the optimization result of the electromagnetic maintaining part is not changed.

4. The method for fully automatically optimizing and designing the electromagnetic operating mechanism of the circuit breaker according to claim 1, wherein the intelligent optimization algorithm subprogram 2 is an artificial intelligent optimization algorithm.

5. The method for fully automatically optimizing and designing the electromagnetic operating mechanism of the circuit breaker according to claim 1, wherein the optimization result meeting the requirement is output through an Excel table.

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