Output voltage optimization method, frequency conversion and voltage transformation system and related device

Abstract

The embodiment of the invention discloses an output voltage optimization method, a frequency conversion and voltage transformation system and a related device, and the method comprises the steps: adjusting the current output voltage parameter of the frequency conversion and voltage transformation system based on an initial solution set of the output voltage parameter of the frequency conversion and voltage transformation system, so as to change the output voltage outputted to a DBD reaction device, changing the current working parameters of the DBD reaction device; determining the nitrogen fixation efficiency of the DBD reaction device under each solution in the initial solution set to determine the current optimal solution and the current worst solution of the output voltage parameter; if the current optimal solution does not reach the convergence condition, generating a new solution set according to the current optimal solution, the current worst solution, a preset NRSR operator and a TAO operator, taking the new solution set as an initial solution set, and returning to execute the step of adjusting the current output voltage parameter of the frequency conversion and voltage transformation system based on the initial solution set; and taking the current optimal solution as a final optimal solution until convergence, and adjusting the current output voltage parameter of the variable-frequency and variable-voltage system so as to enable the DBD reaction device to be in the optimal working parameter.

Description

Technical Field

[0001] The present invention relates to the technical field of energy conversion and chemical synthesis, and in particular to an output voltage optimization method, a frequency conversion and voltage conversion system, and related devices. Background Art

[0002] Ammonia is an important chemical raw material, widely used in fertilizers, chemical synthesis, and other fields. In recent years, with the development of low-carbon technologies, plasma-based ammonia synthesis technology has attracted much attention. Among them, dielectric barrier discharge (DBD) has the advantages of simple device structure, mild operating conditions, and simple raw materials. Its easy start and stop feature allows it to be driven by clean energy, effectively reducing the problem of wind and solar power curtailment caused by the increasing proportion of green electricity, and meeting my country's needs to build a green and low-carbon energy system.

[0003] The key link in the synthesis of ammonia by plasma is to implement AC-DC inversion conversion of the industrial frequency power supply through a specific high-frequency power supply constructed by an analog-to-digital conversion circuit, thereby generating an output voltage signal with the optimal operating frequency required by the DBD discharge reactor, thereby ensuring that the discharge system can synthesize ammonia efficiently and stably.

[0004] The plasma reaction process has highly nonlinear, transient dynamic characteristics and complex multi-physical field coupling effects. As the reaction proceeds, electrical parameters such as the equivalent capacitance in the DBD reactor will continue to change. How to make the DBD reactor in the best working parameters in actual work and achieve the optimal reaction conditions has become a difficult problem. Summary of the Invention

[0005] The main purpose of the present invention is to provide an output voltage optimization method, a frequency conversion and voltage conversion system and related devices, which can solve the problem in the prior art of lacking means to enable the DBD reactor to maintain optimal operating parameters and achieve optimal reaction conditions in actual operation.

[0006] To achieve the above objectives, the present invention provides, in a first aspect, a method for optimizing output voltage. The method is applied to a variable frequency and voltage conversion system, wherein the variable frequency and voltage conversion system is electrically connected to a dielectric barrier discharge (DBD) reaction device, and the DBD reaction device is configured to receive the output voltage of the variable frequency and voltage conversion system and perform a DBD reaction. The method comprises:

[0007] Obtaining a predetermined initial solution set of output voltage parameters of the variable frequency and voltage conversion system;

[0008] adjusting a current output voltage parameter of the variable frequency and voltage conversion system based on the initial solution set to change an output voltage output to the DBD reaction device, thereby changing a current operating parameter of the DBD reaction device;

[0009] determining the nitrogen fixation efficiency of the DBD reaction device at each solution in the initial solution set;

[0010] Determining a current optimal solution and a current worst solution of the output voltage parameter using the nitrogen fixation efficiency;

[0011] If the current optimal solution does not meet the preset convergence condition, a new solution set is generated according to the current optimal solution, the current worst solution, the preset NRSR operator and the preset TAO operator, and the new solution set is used as the initial solution set, and the step of adjusting the current output voltage parameter of the variable frequency and voltage conversion system based on the initial solution set is returned to be executed;

[0012] If the current optimal solution meets the preset convergence condition, the current optimal solution is used as the final optimal solution, and the final optimal solution is used to adjust the current output voltage parameters of the variable frequency and voltage conversion system based on the final optimal solution to make the DBD reaction device at the optimal operating parameters.

[0013] In a feasible implementation, determining the nitrogen fixation efficiency of the DBD reaction device at each solution in the initial solution set includes:

[0014] detecting the discharge power and synthetic ammonia concentration of the DBD reaction device at each solution in the initial solution set;

[0015] The nitrogen fixation efficiency under each solution is determined according to the discharge power, the synthetic ammonia concentration and the preset nitrogen fixation efficiency algorithm.

[0016] In one feasible implementation, the current optimal solution is the solution corresponding to the maximum nitrogen fixation efficiency, and the current worst solution is the solution corresponding to the minimum nitrogen fixation efficiency. Then, generating a new solution set based on the current optimal solution, the current worst solution, the preset NRSR operator, and the preset TAO operator includes:

[0017] Determine a preliminary new solution set using the current optimal solution, the current worst solution, and a preset NRSR operator;

[0018] The preliminary new solution set and the preset TAO operator are used to introduce random variables to obtain the new solution set.

[0019] In a feasible implementation, the initial solution set is determined by the following mathematical expression:

[0020]

[0021] Where lb is the lower bound of the corresponding independent variable, ub is the upper bound of the corresponding independent variable, i is the dimension of the independent variable, j is the number of the solution, i = 1, 2, ..., dim and j = 1, 2, ..., N p, the independent variables include the frequency f of the output voltage o and amplitude U o .

[0022] In one possible implementation, the NRSR operator includes the following mathematical expression:

[0023]

[0024] Where b is a random number with a normal distribution and a mean of 0 and a variance of 1; X b represents the current optimal solution, X b is the solution corresponding to the maximum nitrogen fixation efficiency; X w Indicates the current worst solution, X w is the solution corresponding to the minimum nitrogen fixation efficiency;

[0025] Among them, Δ m According to the formula: Δ m =rand(1,dim)×|X b -x m |Calculate;

[0026] In the formula, rand(1, dim) is a set of vectors with dimension dim composed of random numbers in the interval (0, 1), x m is any current set of solutions.

[0027] To achieve the above objectives, the present invention provides, in a second aspect, an output voltage optimization device, which is applied to a variable frequency and voltage conversion system. The variable frequency and voltage conversion system is electrically connected to a dielectric barrier discharge (DBD) reaction device, and the DBD reaction device is configured to receive the output voltage of the variable frequency and voltage conversion system and perform a DBD reaction. The device comprises:

[0028] Data acquisition module: used to obtain a predetermined initial solution set of output voltage parameters of the variable frequency and voltage conversion system;

[0029] An output adjustment module is configured to adjust a current output voltage parameter of the variable frequency and voltage conversion system based on the initial solution set, so as to change an output voltage output to the DBD reaction device, thereby changing a current operating parameter of the DBD reaction device;

[0030] Efficiency determination module: used to determine the nitrogen fixation efficiency of the DBD reaction device under each solution in the initial solution set;

[0031] The solution set evaluation module is used to determine the current optimal solution and the current worst solution of the output voltage parameter using the nitrogen fixation efficiency;

[0032] A solution set generation module is configured to generate a new solution set based on the current optimal solution, the current worst solution, a preset NRSR operator, and a preset TAO operator if the current optimal solution does not meet the preset convergence condition, and use the new solution set as the initial solution set, and return to execute the step of adjusting the current output voltage parameter of the variable frequency and voltage conversion system based on the initial solution set;

[0033] Optimal solution determination module: used to use the current optimal solution as the final optimal solution if the current optimal solution meets the preset convergence condition. The final optimal solution is used to adjust the current output voltage parameters of the variable frequency and voltage conversion system based on the final optimal solution so that the DBD reaction device is at the optimal operating parameters.

[0034] To achieve the above-mentioned object, the third aspect of the present invention provides a variable frequency voltage conversion system, which includes an output voltage optimization circuit, a rectifier circuit, a buck-boost chopper circuit, an inverter circuit, a filter circuit, and a boost circuit;

[0035] The rectifier circuit is connected to the power grid, rectifies the input AC power into DC power, and outputs the DC power to the buck-boost chopper circuit;

[0036] The buck-boost chopper circuit is connected to the rectifier circuit, performs a step-up or step-down process on the input DC power, and outputs the processed DC power to the inverter circuit;

[0037] The output voltage optimization circuit is connected to the inverter circuit, and the output voltage optimization circuit is used to perform the steps of the method described in the first aspect and any feasible implementation manner, and output the final optimal solution to the inverter circuit;

[0038] The inverter circuit is connected to the buck-boost chopper circuit, inverts the processed direct current into alternating current corresponding to the final optimal solution, and outputs the alternating current corresponding to the final optimal solution to the filter circuit; the current output voltage of the variable frequency and voltage conversion system includes the alternating current corresponding to the final optimal solution;

[0039] The filter circuit is connected to the inverter circuit, filters out harmonics in the alternating current corresponding to the final optimal solution, and outputs the filtered alternating current to the boost circuit;

[0040] The boost circuit is connected to the filter circuit, boosts the filtered AC power, and outputs the boosted AC power to the DBD reaction device;

[0041] The output of the boost circuit is connected to the high-voltage end of the DBD reaction device, and the high-voltage end of the DBD reaction device is used to receive the boosted alternating current to operate.

[0042] In one feasible implementation, the buck-boost chopper circuit is controlled to be turned on and off to change the circuit topology of the buck-boost chopper circuit, thereby performing a step-up or step-down process on the DC voltage, and outputting the processed DC power to the inverter circuit.

[0043] Among them, there is the following relationship between the input voltage and the output voltage:

[0044] Where d is the duty cycle in the buck-boost chopper circuit.

[0045] To achieve the above-mentioned objectives, the fourth aspect of the present invention provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the processor executes the following steps as shown in the first aspect and any feasible implementation method.

[0046] To achieve the above-mentioned objectives, the fifth aspect of the present invention provides a computer device, comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps shown in the first aspect and any feasible implementation method.

[0047] The embodiments of the present invention have the following beneficial effects:

[0048] The present invention provides an output voltage optimization method, which is applied to a variable frequency and voltage conversion system. The variable frequency and voltage conversion system is electrically connected to a dielectric barrier discharge (DBD) reaction device, and the DBD reaction device is used to receive the output voltage of the variable frequency and voltage conversion system to perform a DBD reaction. The method includes: obtaining a predetermined initial solution set of output voltage parameters of the variable frequency and voltage conversion system; adjusting the current output voltage parameters of the variable frequency and voltage conversion system based on the initial solution set to change the output voltage output to the DBD reaction device, thereby changing the current operating parameters of the DBD reaction device; and determining the nitrogen fixation efficiency of the DBD reaction device under each solution in the initial solution set; The nitrogen fixation efficiency is used to determine the current optimal solution and the current worst solution of the output voltage parameter; if the current optimal solution does not meet the preset convergence condition, a new solution set is generated based on the current optimal solution, the current worst solution, the preset NRSR operator and the preset TAO operator, and the new solution set is used as the initial solution set, and the process returns to execute the step of adjusting the current output voltage parameter of the variable frequency and voltage conversion system based on the initial solution set; if the current optimal solution meets the preset convergence condition, the current optimal solution is used as the final optimal solution, and the final optimal solution is used to adjust the current output voltage parameter of the variable frequency and voltage conversion system based on the final optimal solution, so that the DBD reaction device is at the optimal operating parameter.

[0049] The above method can be used to iteratively solve the final optimal solution of the output voltage parameters using the NRSR operator and the TAO operator, so that the DBD reactor is in the optimal operating parameters. Among them, the NRSR operator is gradient-guided and can reduce the number of iterations. The TAO operator introduces random variables to avoid falling into the local optimal solution, which can improve the efficiency of solving the output voltage parameters corresponding to the optimal working state of the DBD reactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0051] in:

[0052] Figure 1 is a flow chart of a method for optimizing output voltage according to an embodiment of the present invention;

[0053] Figure 2 This is a structural block diagram of a frequency conversion and voltage conversion system according to an embodiment of the present invention;

[0054] Figure 3 This is a circuit diagram of a frequency conversion and voltage conversion system according to an embodiment of the present invention;

[0055] Figure 4 This is a structural block diagram of an output voltage optimization device according to an embodiment of the present invention;

[0056] Figure 5 4 is a structural block diagram of a computer device in an embodiment of the present invention. DETAILED DESCRIPTION

[0057] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0058] See also Figure 1 , Figure 1 FIG. 1 is a flow chart of a method for optimizing output voltage according to an embodiment of the present invention. Figure 1The method is applied to a variable frequency and voltage conversion system, wherein the variable frequency and voltage conversion system is electrically connected to a dielectric barrier discharge (DBD) reaction device, and the DBD reaction device is used to receive the output voltage of the variable frequency and voltage conversion system to perform a DBD reaction. The method includes:

[0059] 101. Obtain a predetermined initial solution set of output voltage parameters of the variable frequency and voltage conversion system;

[0060] It should be noted that in order to ensure that the DBD reaction device is in the best working parameters and achieves the optimal reaction conditions in actual work, this application is achieved by regulating the output voltage of the frequency conversion and voltage conversion system. Since the DBD reaction device works by receiving the output voltage of the frequency conversion and voltage conversion system, the output voltage affects the working state of the DBD. In order to determine the output voltage parameters of the output voltage that allows the DBD to be in the optimal reaction conditions, this application pre-designs a Newton-Raphson optimization algorithm, and uses this optimization algorithm to determine the output voltage parameters of the output voltage that allows the DBD to be in the optimal reaction conditions.

[0061] First, an initial solution set of predetermined output voltage parameters of the variable frequency and voltage conversion system is obtained, wherein the output voltage parameters may be parameters affecting the output voltage, such as the frequency and amplitude of the output voltage, etc. The initial solution set includes several solutions, each solution corresponding to a set of output voltage frequencies and amplitudes.

[0062] Prior to step 101, the independent variables affecting the objective function and the upper and lower limits of the independent variables can be determined experimentally, and the upper and lower limits can be used to obtain an initial solution set. If the objective function is used to calculate the optimal nitrogen fixation efficiency, the independent variables can be the frequency and auxiliary of the output voltage. That is, the objective function can be a function for calculating the optimal operating parameters of the DBD, and the independent variables can be the independent variables of the output voltage that affect the optimal operating parameters. Exemplarily, the method further includes:

[0063] Step S1001: Determine the dimension of the solution. According to the actual situation and preliminary experiments, determine the parameters that affect the objective function and define them as independent variables. The number of independent variables is the dimension of the solution. For example, in this application, the objective function is the nitrogen fixation efficiency algorithm. The independent variables can include the two dimensions of the frequency and amplitude of the output voltage.

[0064] Step S1002: Determine the objective function according to the actual situation. If the maximum value of the objective function is to be solved, it is necessary to convert it into the inverse of the objective function to solve its minimum value;

[0065] Step S1003: Determine the upper and lower limits of each variable according to actual conditions.

[0066] Exemplarily, the solution set is initialized according to formula (1), and the initial solution set is determined by the following mathematical expression (1):

[0067]

[0068] Where lb is the lower bound of the corresponding independent variable, ub is the upper bound of the corresponding independent variable, i is the dimension of the independent variable, j is the number of the solution, i = 1, 2, ..., dim and j = 1, 2, ..., N p , the independent variables include the frequency f of the output voltage o and amplitude U o In this embodiment, the independent variable that needs to be regulated for the DBD reactor is the frequency and amplitude of the power supply output voltage, so the independent variable is selected as x1, which is the output voltage amplitude U. o , x2 is the output voltage frequency f o ;

[0069] 102. Adjust the current output voltage parameters of the variable frequency and voltage conversion system based on the initial solution set to change the output voltage output to the DBD reaction device, thereby changing the current operating parameters of the DBD reaction device;

[0070] 103. Determine the nitrogen fixation efficiency of the DBD reaction device at each solution in the initial solution set;

[0071] After obtaining the initial solution set, the current output voltage parameter of the variable frequency and voltage conversion system can be adjusted based on the initial solution set to change the output voltage to the DBD reactor, thereby changing the current operating parameters of the DBD reactor. Furthermore, the output voltage parameter that optimizes the DBD reactor's reaction conditions is determined based on the nitrogen fixation efficiency of the DBD reactor.

[0072] Among them, the discharge power and synthetic ammonia concentration at each solution can be used to determine the nitrogen fixation efficiency at each solution. Step 103 includes: detecting the discharge power and synthetic ammonia concentration of the DBD reaction device at each solution in the initial solution set; and determining the nitrogen fixation efficiency at each solution based on the discharge power, synthetic ammonia concentration and a preset nitrogen fixation efficiency algorithm.

[0073] Exemplarily, the independent variables are adjusted according to the solution; the discharge power and the concentration of synthetic ammonia in the DBD device are detected, and the nitrogen fixation efficiency is calculated according to formula (2);

[0074]

[0075] Where, P out is the discharge frequency, is the concentration of synthetic ammonia, and η is the nitrogen fixation efficiency.

[0076] 104. Determine a current optimal solution and a current worst solution of the output voltage parameter using the nitrogen fixation efficiency;

[0077] Furthermore, the optimal solution and the worst solution are evaluated by nitrogen fixation efficiency, where the optimal solution X n is the solution corresponding to the maximum nitrogen fixation efficiency (frequency and amplitude of the output voltage), the worst solution X w is the solution corresponding to the minimum nitrogen fixation efficiency.

[0078] And use the current optimal solution X b and the current worst solution X w Determine whether the solution process converges and whether the final optimal solution is obtained. For example, the current optimal solution can be compared with the previous optimal solution. If the deviation is small, it is considered to be converged. If the deviation is large, it is considered not to have converged.

[0079] If the current optimal solution does not meet the preset convergence conditions, step 105 is executed to continue to find the optimal solution. Conversely, if the current optimal solution meets the preset convergence conditions, step 106 is executed to use the current optimal solution as the final optimal solution. The final optimal solution is used to adjust the current output voltage parameters of the variable frequency and voltage conversion system based on the final optimal solution to optimize the operating parameters of the DBD reaction device.

[0080] 105. If the current optimal solution does not meet the preset convergence condition, a new solution set is generated based on the current optimal solution, the current worst solution, the preset NRSR operator, and the preset TAO operator, and the new solution set is used as the initial solution set. The process returns to the step of adjusting the current output voltage parameter of the variable frequency and voltage conversion system based on the initial solution set.

[0081] It can be understood that in order to obtain the optimal solution, it is necessary to continuously iterate the solution of the independent variable and evaluate whether it is the optimal solution. If it is not the optimal solution, it needs to be re-solved. Therefore, if the current optimal solution does not meet the preset convergence conditions, a new solution set is generated based on the current optimal solution, the current worst solution, the preset NRSR operator and the preset TAO operator, and the new solution set is used as the initial solution set. Return to execute the step of adjusting the current output voltage parameters of the variable frequency and voltage transformation system based on the initial solution set, and re-solve the optimal solution.

[0082] Furthermore, in this application, the current optimal solution is the solution corresponding to the maximum value of nitrogen fixation efficiency, and the current worst solution is the solution corresponding to the minimum value of nitrogen fixation efficiency. The optimal solution is iterated by the Newton-Raphson algorithm. The core of the algorithm lies in the NRSR operator and the TAO operator. The introduction of the NRSR operator and the TAO operator on the basis of the traditional Newton-Raphson algorithm can effectively reduce the number of iterations, speed up the convergence speed, and avoid falling into the local optimal solution. The NRSR, whose function is to generate a new solution set based on the gradient, speed up the convergence speed of the solution set, and reduce the number of iterations; the TAO, whose function is to introduce random variables in the process of solution set generation to avoid the algorithm from falling into the local optimal solution; the full names of the NRSR operator and the TAO operator are Newton-Raphson Search Rule (NRSR) and Trap Avoidance Operator (TAO), respectively.

[0083] Newton-Raphson search rule (NRSR): The Newton-Raphson search rule (NRSR) is based on the numerical iteration idea of ​​the Newton-Raphson method. It updates the position of the solution through the first-order derivative (gradient) and second-order derivative (Hessian matrix) information to accelerate convergence.

[0084] Trap Avoidance Operator (TAO): The Trap Avoidance Operator (TAO) prevents the algorithm from falling into local optima by using random perturbations and population diversity enhancement strategies. For example, it introduces random difference vectors or adjusts the solution update step size during the iteration process to improve global search capabilities.

[0085] Specifically, generating a new solution set based on the current optimal solution, the current worst solution, the preset NRSR operator and the preset TAO operator includes: using the current optimal solution, the current worst solution and the preset NRSR operator to determine a preliminary new solution set; using the preliminary new solution set and the preset TAO operator to introduce random variables to obtain the new solution set.

[0086] For example, the NRSR operator is introduced. The NRSR operator is gradient-oriented and can reduce the number of iterations.

[0087] Among them, NRSR is based on Solution;

[0088] Where b is a random number with a normal distribution and a mean of 0 and a variance of 1, X b Indicates the position of the optimal solution before iteration, X w Indicates the position of the worst solution before iteration, X b and X w The position of is defined according to the nitrogen fixation efficiency calculated in step S103: X b is the position of the solution corresponding to the maximum nitrogen fixation efficiency, Xw is the position of the solution corresponding to the minimum nitrogen fixation efficiency.

[0089] Among them, Δ m According to the formula: Δ m =rand(1,dim)×|X b -x m |Calculate;

[0090] Among them, rand(1,dim) is a set of vectors with dimension dim composed of random numbers in the interval (0,1), x m is any set of solutions before iteration.

[0091] The TAO operator is introduced. The TAO operator is a random variable generated according to a preset formula. Its purpose is to introduce random variables to avoid falling into the local optimal solution.

[0092] 106. If the current optimal solution meets a preset convergence condition, the current optimal solution is used as a final optimal solution. The final optimal solution is used to adjust the current output voltage parameters of the variable frequency and voltage conversion system based on the final optimal solution, so that the DBD reaction device is at the optimal operating parameters.

[0093] It can be understood that if the current optimal solution reaches the preset convergence condition, it means that the current optimal solution is already the optimal solution, then the current optimal solution is used as the final optimal solution, and the final optimal solution is used to adjust the current output voltage parameters of the variable frequency and voltage transformation system based on the final optimal solution, so that the DBD reaction device is at the optimal operating parameters.

[0094] The present invention provides an output voltage optimization method, which is applied to a variable frequency and voltage conversion system. The variable frequency and voltage conversion system is electrically connected to a dielectric barrier discharge (DBD) reaction device, and the DBD reaction device is used to receive the output voltage of the variable frequency and voltage conversion system to perform a DBD reaction. The method includes: obtaining a predetermined initial solution set of output voltage parameters of the variable frequency and voltage conversion system; adjusting the current output voltage parameters of the variable frequency and voltage conversion system based on the initial solution set to change the output voltage output to the DBD reaction device, thereby changing the current operating parameters of the DBD reaction device; and determining the nitrogen fixation efficiency of the DBD reaction device under each solution in the initial solution set; The nitrogen fixation efficiency is used to determine the current optimal solution and the current worst solution of the output voltage parameter; if the current optimal solution does not meet the preset convergence condition, a new solution set is generated based on the current optimal solution, the current worst solution, the preset NRSR operator and the preset TAO operator, and the new solution set is used as the initial solution set, and the process returns to execute the step of adjusting the current output voltage parameter of the variable frequency and voltage conversion system based on the initial solution set; if the current optimal solution meets the preset convergence condition, the current optimal solution is used as the final optimal solution, and the final optimal solution is used to adjust the current output voltage parameter of the variable frequency and voltage conversion system based on the final optimal solution, so that the DBD reaction device is at the optimal operating parameter.

[0095] The above method can be used to iteratively solve the final optimal solution of the output voltage parameters using the NRSR operator and the TAO operator, so that the DBD reactor is in the optimal operating parameters. Among them, the NRSR operator is gradient-guided and can reduce the number of iterations. The TAO operator introduces random variables to avoid falling into the local optimal solution, which can improve the efficiency of solving the output voltage parameters corresponding to the optimal working state of the DBD reactor.

[0096] See also Figure 2 , Figure 2 FIG. 1 is a structural block diagram of a variable frequency and voltage conversion system according to an embodiment of the present invention, wherein Figure 1 The method shown can be applied to the system, specifically to an optimization circuit for the output voltage of the system, wherein, Figure 2 The variable frequency and voltage conversion system 200 shown includes an output voltage optimization circuit 201, a rectifier circuit 202, a buck-boost chopper circuit 203, an inverter circuit 204, a filter circuit 205, and a boost circuit 206;

[0097] The rectifier circuit is connected to the power grid, rectifies the input AC power into DC power, and outputs the DC power to the buck-boost chopper circuit;

[0098] The buck-boost chopper circuit is connected to the rectifier circuit, performs a step-up or step-down process on the input DC power, and outputs the processed DC power to the inverter circuit;

[0099] The output voltage optimization circuit is connected to the inverter circuit, and the output voltage optimization circuit is used to perform the following Figure 1 The steps of the method shown in FIG. 1 are performed, and the final optimal solution is output to the inverter circuit;

[0100] The inverter circuit is connected to the buck-boost chopper circuit, inverts the processed DC power into AC power corresponding to the final optimal solution, and outputs the AC power corresponding to the final optimal solution to the filter circuit; the current output voltage of the variable frequency and voltage transformation system includes the AC power corresponding to the final optimal solution; for example, if the final optimal solution is the frequency and amplitude of the output voltage, the processed DC power is inverted into AC power with the frequency and amplitude corresponding to the final optimal solution, and the AC power is output to the filter circuit.

[0101] The filter circuit is connected to the inverter circuit, filters out harmonics in the alternating current corresponding to the final optimal solution, and outputs the filtered alternating current to the boost circuit;

[0102] The boost circuit is connected to the filter circuit, boosts the filtered AC power, and outputs the boosted AC power to the DBD reaction device 207;

[0103] The output of the boost circuit is connected to the high-voltage end of the DBD reaction device, and the high-voltage end of the DBD reaction device is used to receive the boosted alternating current to operate, wherein the boosted alternating current can be high-frequency and high-voltage alternating current.

[0104] In one feasible implementation, the buck-boost chopper circuit is controlled to be turned on and off to change the circuit topology of the buck-boost chopper circuit, thereby performing a step-up or step-down process on the DC voltage, and outputting the processed DC power to the inverter circuit.

[0105] Among them, the input voltage U DCi With output voltage U DCo The following relationship exists:

[0106] Where d is the duty cycle in the buck-boost chopper circuit.

[0107] The present invention provides a variable frequency and voltage conversion system, which includes an output voltage optimization circuit, a rectifier circuit, a buck-boost chopper circuit, an inverter circuit, a filter circuit, and a boost circuit; the rectifier circuit is connected to the power grid, rectifies the input AC power into DC power, and outputs the DC power to the buck-boost chopper circuit; the buck-boost chopper circuit is connected to the rectifier circuit, performs a boost or buck process on the input DC power, and outputs the processed DC power to the inverter circuit; the output voltage optimization circuit is connected to the inverter circuit, and the output voltage optimization circuit is used to execute the steps of the method of the present application and output the final optimal solution to the inverter circuit; the inverter circuit is connected to the buck-boost chopper circuit. The chopper circuit is connected to the inverter circuit, inverting the processed direct current into alternating current corresponding to the final optimal solution and outputting the AC corresponding to the final optimal solution to the filter circuit; the current output voltage of the variable frequency and voltage conversion system includes the AC corresponding to the final optimal solution; the filter circuit is connected to the inverter circuit, filtering harmonics from the AC corresponding to the final optimal solution and outputting the filtered AC to the boost circuit; the boost circuit is connected to the filter circuit, boosting the filtered AC and outputting the boosted AC to the DBD reactor; the output of the boost circuit is connected to the high-voltage terminal of the DBD reactor, which is used to receive the boosted AC for operation. The variable frequency and voltage conversion system can iteratively solve the final optimal solution for the output voltage parameters using the NRSR operator and the TAO operator, thereby ensuring that the DBD reactor is at the optimal operating parameters. The NRSR operator is gradient-guided, reducing the number of iterations, and the TAO operator introduces random variables to avoid falling into local optimal solutions, thereby improving the efficiency of solving the output voltage parameters corresponding to the optimal operating state of the DBD reactor.

[0108] See also Figure 3 , Figure 3 FIG. 1 is a circuit diagram of a frequency conversion and voltage conversion system according to an embodiment of the present invention. Figure 3 The frequency conversion and voltage conversion circuit shown includes a rectifier circuit, a step-up and step-down chopper circuit, an LLC resonant inverter circuit (referred to as the inverter circuit), a filter circuit, and a boost circuit. It should be noted that Figure 3 The rectifier circuit, buck-boost chopper circuit, LLC resonant inverter circuit (abbreviated as inverter circuit), filter circuit, boost circuit and Figure 2 The rectifier circuit 202, the buck-boost chopper circuit 203, the inverter circuit 204, the filter circuit 205 and the boost circuit 206 are similar in content and are not described here to avoid repetition. For details, please refer to Figure 2 The rectifier circuit 202, the buck-boost chopper circuit 203, the inverter circuit 204, the filter circuit 205 and the boost circuit 206 are shown.

[0109] The rectifier circuit is connected to the power grid through an EMI filter. After the input power grid AC is processed by the EMI filter, it is input into the rectifier circuit and rectified into DC power and output, and the power factor is corrected through the PFC control module; specifically, the power factor correction of the rectifier circuit is achieved through the PFC control module.

[0110] The buck-boost chopper circuit is connected to a rectifier circuit, boosting or stepping down the input DC power and outputting DC power. Furthermore, the buck-boost chopper circuit has its input connected to the rectifier circuit and its output connected to the inverter circuit. By controlling the switching of field-effect transistors, the circuit topology is changed to boost or step down the DC voltage and output the desired DC power. The following relationship exists between the input and output voltages: d is the duty cycle in the buck-boost chopper circuit.

[0111] The inverter circuit is connected to a buck-boost chopper circuit after passing through a thin film capacitor. After the thin film capacitor absorbs the high-frequency ripple in the output signal of the chopper circuit, the inverter circuit inverts the input DC power into AC power of the required frequency and outputs it. The required frequency is determined by the final optimal solution.

[0112] The filter circuit is connected to the inverter circuit to filter out harmonics in the AC power output by the inverter circuit and output AC power of the required frequency;

[0113] The boost circuit is connected to the inverter circuit to boost the input high-frequency AC power to the required high-voltage high-frequency AC power and output it, and its output is connected to the high-voltage terminal of the DBD reaction device. Specifically, the DBD reaction device can be a DBD ammonia synthesis device.

[0114] In one embodiment, a control circuit for various switching devices in a variable frequency and voltage conversion circuit is provided, including a CPLD chip, a thyristor in a rectifier circuit, a field effect transistor in a buck-boost chopper circuit, an IGBT in an inverter circuit, and a PWM signal generating circuit. Different pulse signal generators are used to output pulse signals that meet control requirements and act on the switching devices.

[0115] The thyristor in the rectifier circuit is connected to the bridge arm of the full-bridge rectifier, and the topology of the circuit is changed by changing the on-off state of the thyristor;

[0116] The CPLD chip is connected to the thyristor in the rectifier circuit, and the trigger pulse generated by the CPLD chip can control the opening and closing of the thyristor;

[0117] The field effect tube is connected between the inductor and the capacitor in the buck-boost chopper circuit, and the working state of the field effect tube corresponds to different circuit topologies;

[0118] The PWM signal generating circuit is connected to the field effect tube, outputs a trigger signal with a duty cycle that meets the control requirements, and controls the working state of the field effect tube;

[0119] The IGBT device in the inverter circuit is connected to the bridge arm in the multi-level full-bridge inverter circuit. Different IGBT switching states correspond to different circuit topologies and provide a commutation channel for switching the inverter circuit structure.

[0120] The PWM signal generating circuit is connected to the IGBT device in the inverter circuit, and outputs a corresponding PWM waveform according to control requirements to control the working state of the IGBT in the inverter circuit.

[0121] In one embodiment, a fully controlled switching device suitable for circuit operation needs to be selected based on circuit parameters such as voltage and current. The control circuit of the switching device sends a trigger signal to the switching device, and a suitable integrated trigger needs to be selected based on actual conditions.

[0122] In one embodiment, the control circuit of the buck-boost chopper circuit needs to generate a corresponding PWM signal according to an algorithm to realize the on-off control of the switching device in the buck-boost chopper circuit, including a digital-to-analog converter and a field programmable gate array (FPGA);

[0123] The digital-to-analog converter is connected to the power supply output, converting the collected output voltage and current values ​​into the required digital signals and outputting them to the FPGA;

[0124] The FPGA is connected to a digital-to-analog converter, receives a signal output by the digital-to-analog converter, and is deeply coupled with a Newton-Raphson optimization algorithm to control the output PWM waveform through an internal phase accumulator.

[0125] In one embodiment, the control circuit of the inverter circuit needs to generate a corresponding PWM signal based on the solution of the Newton-Raphson optimization algorithm (i.e., the control circuit of the inverter circuit can be used as the above-mentioned output voltage optimization circuit to execute the method described in this application to obtain the final optimal solution to control the inverter circuit) to achieve on-off control of the switching devices in the inverter circuit, including a digital-to-analog converter, a digitally controlled oscillator, a field programmable gate array (FPGA), and a PID controller;

[0126] The digital-to-analog converter is connected to the power supply output, converting the collected output voltage and current values ​​into the required digital signals and outputting them to the FPGA;

[0127] The digitally controlled oscillator converts the frequency value obtained from the solution of the Newton-Raphson optimization algorithm into a specific carrier signal frequency and outputs it to the FPGA, thereby achieving glitch-free frequency switching;

[0128] The FPGA receives the output signal of the digital-to-analog converter and the output signal of the digitally controlled oscillator, and realizes oscillation internally through a phase accumulator, thereby achieving high-speed and precise control of the frequency;

[0129] The PID controller is connected to the buck-boost chopper circuit to achieve voltage stabilization control of the output voltage of the buck-boost chopper circuit.

[0130] The embodiment of the present invention discloses an AC voltage-frequency conversion circuit and a Newton-Raphson optimization algorithm. In the voltage-frequency conversion circuit, a rectifier circuit is connected to the power grid to rectify the input AC power into DC power; a buck-boost chopper circuit is connected to the rectifier circuit to boost or buck the input DC power; an inverter circuit is connected to the buck-boost chopper circuit to invert the input DC power into high-frequency AC power; the filter circuit is connected to the inverter circuit to filter out harmonics in the AC power; and a boost circuit is connected to the inverter circuit to boost the input high-frequency AC power to the required high-voltage and high-frequency AC power and output it. In this solution, AC voltage-frequency conversion is achieved by connecting three circuits. The Newton-Raphson algorithm reduces the number of iterations while avoiding falling into local optimal solutions by introducing the NRSR operator and the TAO operator.

[0131] See also Figure 4 , Figure 4 FIG. 1 is a structural block diagram of an output voltage optimization device according to an embodiment of the present invention. Figure 4 The device is applied to a variable frequency and voltage conversion system. The variable frequency and voltage conversion system is electrically connected to a dielectric barrier discharge (DBD) reaction device. The DBD reaction device is used to receive the output voltage of the variable frequency and voltage conversion system to perform a DBD reaction. The device includes:

[0132] Data acquisition module 401: used to obtain a predetermined initial solution set of output voltage parameters of the variable frequency and voltage conversion system;

[0133] Output adjustment module 402: used for adjusting the current output voltage parameter of the variable frequency and voltage conversion system based on the initial solution set to change the output voltage output to the DBD reaction device, so that the current operating parameter of the DBD reaction device changes;

[0134] Efficiency determination module 403: used to determine the nitrogen fixation efficiency of the DBD reaction device under each solution in the initial solution set;

[0135] A solution set evaluation module 404 is configured to determine a current optimal solution and a current worst solution of the output voltage parameter using the nitrogen fixation efficiency;

[0136] Solution set generation module 405: configured to generate a new solution set based on the current optimal solution, the current worst solution, a preset NRSR operator, and a preset TAO operator if the current optimal solution does not meet the preset convergence condition, and use the new solution set as the initial solution set, and return to the step of adjusting the current output voltage parameter of the variable frequency and voltage conversion system based on the initial solution set;

[0137] The optimal solution determination module 406 is used to use the current optimal solution as the final optimal solution if the current optimal solution meets the preset convergence condition. The final optimal solution is used to adjust the current output voltage parameters of the variable frequency and voltage conversion system based on the final optimal solution to ensure that the DBD reaction device is at the optimal operating parameters.

[0138] It should be noted that Figure 4 The functions of each module in the device shown are Figure 1 The contents of each step in the method shown are similar, so we will not elaborate on them here to avoid repetition. For details, please refer to Figure 1 The content of each step in the method shown.

[0139] The present invention provides an output voltage optimization device, which is applied to a variable frequency and voltage conversion system. The variable frequency and voltage conversion system is electrically connected to a dielectric barrier discharge (DBD) reaction device, and the DBD reaction device is used to receive the output voltage of the variable frequency and voltage conversion system to perform DBD reaction work. The device includes: a data acquisition module: used to obtain a predetermined initial solution set of the output voltage parameters of the variable frequency and voltage conversion system; an output adjustment module: used to adjust the current output voltage parameters of the variable frequency and voltage conversion system based on the initial solution set to change the output voltage output to the DBD reaction device, so that the current working parameters of the DBD reaction device are changed; an efficiency determination module: used to determine the nitrogen fixation efficiency of the DBD reaction device under each solution in the initial solution set; a solution set evaluation ... An estimation module is used to determine the current optimal solution and the current worst solution of the output voltage parameter by using the nitrogen fixation efficiency; a solution set generation module is used to generate a new solution set according to the current optimal solution, the current worst solution, the preset NRSR operator and the preset TAO operator if the current optimal solution does not meet the preset convergence condition, and use the new solution set as the initial solution set, and return to execute the step of adjusting the current output voltage parameter of the variable frequency and voltage conversion system based on the initial solution set; an optimal solution determination module is used to use the current optimal solution as the final optimal solution if the current optimal solution meets the preset convergence condition, and the final optimal solution is used to adjust the current output voltage parameter of the variable frequency and voltage conversion system based on the final optimal solution, so that the DBD reaction device is at the optimal working parameter. The above-mentioned device can realize the iterative solution of the final optimal solution of the output voltage parameters using the NRSR operator and the TAO operator, so that the DBD reaction device is in the optimal working parameters. Among them, the NRSR operator is gradient-guided and can reduce the number of iterations. The TAO operator introduces random variables to avoid falling into the local optimal solution, so that the efficiency of solving the output voltage parameters corresponding to the optimal working state of the DBD reactor can be improved.

[0140] Figure 5 FIG1 shows an internal structure diagram of a computer device in an embodiment. The computer device can be a terminal or a server. Figure 5 As shown, the computer device includes a processor, a memory, and a network interface connected via a system bus. The memory includes a non-volatile storage medium and an internal memory. The non-volatile storage medium of the computer device stores an operating system and may also store a computer program. When the computer program is executed by the processor, the processor can implement the above method. The internal memory may also store a computer program. When the computer program is executed by the processor, the processor can implement the above method. It will be understood by those skilled in the art that Figure 5The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0141] In one embodiment, a computer device is provided, comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor performs the following Figure 1 Steps of the method shown.

[0142] In one embodiment, a computer-readable storage medium is provided, which stores a computer program. When the computer program is executed by a processor, the processor is caused to execute the following Figure 1 Steps of the method shown.

[0143] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The program can be stored in a non-volatile computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0144] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0145] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A method for optimizing output voltage, characterized in that: The method is applied to a variable frequency and voltage conversion system, wherein the variable frequency and voltage conversion system is electrically connected to a dielectric barrier discharge (DBD) reaction device, and the DBD reaction device is used to receive the output voltage of the variable frequency and voltage conversion system to perform a DBD reaction. The method includes: Obtaining a predetermined initial solution set of output voltage parameters of the variable frequency and voltage conversion system; adjusting a current output voltage parameter of the variable frequency and voltage conversion system based on the initial solution set to change an output voltage output to the DBD reaction device, thereby changing a current operating parameter of the DBD reaction device; determining the nitrogen fixation efficiency of the DBD reaction device at each solution in the initial solution set; Determining a current optimal solution and a current worst solution of the output voltage parameter using the nitrogen fixation efficiency; If the current optimal solution does not meet the preset convergence condition, a new solution set is generated according to the current optimal solution, the current worst solution, the preset NRSR operator and the preset TAO operator, and the new solution set is used as the initial solution set, and the step of adjusting the current output voltage parameter of the variable frequency and voltage conversion system based on the initial solution set is returned to be executed; If the current optimal solution meets the preset convergence condition, the current optimal solution is used as the final optimal solution, and the final optimal solution is used to adjust the current output voltage parameters of the variable frequency and voltage conversion system based on the final optimal solution to make the DBD reaction device at the optimal operating parameters.

2. The method according to claim 1, characterized in that Determining the nitrogen fixation efficiency of the DBD reaction device at each solution in the initial solution set includes: detecting the discharge power and synthetic ammonia concentration of the DBD reaction device at each solution in the initial solution set; The nitrogen fixation efficiency under each solution is determined according to the discharge power, the synthetic ammonia concentration and the preset nitrogen fixation efficiency algorithm.

3. The method according to claim 1, characterized in that The current optimal solution is the solution corresponding to the maximum nitrogen fixation efficiency, and the current worst solution is the solution corresponding to the minimum nitrogen fixation efficiency. Then, according to the current optimal solution, the current worst solution, the preset NRSR operator and the preset TAO operator, a new solution set is generated, including: Determine a preliminary new solution set using the current optimal solution, the current worst solution, and a preset NRSR operator; The preliminary new solution set and the preset TAO operator are used to introduce random variables to obtain the new solution set.

4. The method according to claim 3, characterized in that The initial solution set is determined by the following mathematical expression: Where lb is the lower bound of the corresponding independent variable, ub is the upper bound of the corresponding independent variable, i is the dimension of the independent variable, j is the number of the solution, i = 1, 2, ..., dim and j = 1, 2, ..., N p , the independent variables include the frequency f of the output voltage o and amplitude U o .

5. The method according to claim 4, characterized in that: The NRSR operator includes the following mathematical expression: Where b is a random number with a normal distribution and a mean of 0 and a variance of 1; X b represents the current optimal solution, X b is the solution corresponding to the maximum nitrogen fixation efficiency; X w Indicates the current worst solution, X w is the solution corresponding to the minimum nitrogen fixation efficiency; Among them, Δ m According to the formula: Δ m =rand(1,dim)×|X b -x m |Calculate; In the formula, rand(1, dim) is a set of vectors with dimension dim composed of random numbers in the interval (0, 1), x m is any current set of solutions.

6. An output voltage optimization device, characterized in that: The device is applied to a variable frequency and voltage conversion system, the variable frequency and voltage conversion system is electrically connected to a dielectric barrier discharge (DBD) reaction device, and the DBD reaction device is used to receive the output voltage of the variable frequency and voltage conversion system to perform DBD reaction. The device includes: Data acquisition module: used to obtain a predetermined initial solution set of output voltage parameters of the variable frequency and voltage conversion system; An output adjustment module is configured to adjust a current output voltage parameter of the variable frequency and voltage conversion system based on the initial solution set, so as to change an output voltage output to the DBD reaction device, thereby changing a current operating parameter of the DBD reaction device; Efficiency determination module: used to determine the nitrogen fixation efficiency of the DBD reaction device under each solution in the initial solution set; A solution set evaluation module is configured to determine a current optimal solution and a current worst solution of the output voltage parameter using the nitrogen fixation efficiency; A solution set generation module is configured to generate a new solution set based on the current optimal solution, the current worst solution, a preset NRSR operator, and a preset TAO operator if the current optimal solution does not meet the preset convergence condition, and use the new solution set as the initial solution set, and return to execute the step of adjusting the current output voltage parameter of the variable frequency and voltage conversion system based on the initial solution set; Optimal solution determination module: used to use the current optimal solution as the final optimal solution if the current optimal solution meets the preset convergence condition. The final optimal solution is used to adjust the current output voltage parameters of the variable frequency and voltage conversion system based on the final optimal solution so that the DBD reaction device is at the optimal operating parameters.

7. A variable frequency and voltage conversion system, characterized in that: The variable frequency and voltage conversion system includes an output voltage optimization circuit, a rectifier circuit, a step-up and step-down chopper circuit, an inverter circuit, a filter circuit, and a boost circuit; The rectifier circuit is connected to the power grid, rectifies the input AC power into DC power, and outputs the DC power to the buck-boost chopper circuit; The buck-boost chopper circuit is connected to the rectifier circuit, performs a step-up or step-down process on the input DC power, and outputs the processed DC power to the inverter circuit; The output voltage optimization circuit is connected to the inverter circuit, and the output voltage optimization circuit is used to perform the steps of the method according to any one of claims 1 to 5 and output the final optimal solution to the inverter circuit; The inverter circuit is connected to the buck-boost chopper circuit, inverts the processed direct current into alternating current corresponding to the final optimal solution, and outputs the alternating current corresponding to the final optimal solution to the filter circuit; the current output voltage of the variable frequency and voltage conversion system includes the alternating current corresponding to the final optimal solution; The filter circuit is connected to the inverter circuit, filters out harmonics in the alternating current corresponding to the final optimal solution, and outputs the filtered alternating current to the boost circuit; The boost circuit is connected to the filter circuit, boosts the filtered AC power, and outputs the boosted AC power to the DBD reaction device; The output of the boost circuit is connected to the high-voltage end of the DBD reaction device, and the high-voltage end of the DBD reaction device is used to receive the boosted alternating current to operate.

8. The frequency conversion and voltage conversion system according to claim 7, characterized in that: By controlling the on / off of the buck-boost chopper circuit to change the circuit topology of the buck-boost chopper circuit, the DC voltage is boosted or bucked, and the processed DC voltage is output to the inverter circuit; Among them, there is the following relationship between the input voltage and the output voltage: Where d is the duty cycle in the buck-boost chopper circuit.

9. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the processor is caused to perform the steps of the method according to any one of claims 1 to 5.

10. A computer device comprising a memory and a processor, characterized in that: The memory stores a computer program, and when the computer program is executed by the processor, the processor is caused to perform the steps of the method according to any one of claims 1 to 5.

Images