手把手教你学Simulink实例：基于Simulink的光伏系统MPPT控制仿真实例

 function dutyCycle = fcn(voltage, current, prevDutyCycle)

    
     % Parameters
    
     delta = 0.01;  % Perturbation step size
    
     V_ref = voltage;
    
     I_ref = current;
    
     
    
     % Calculate power
    
     P_ref = V_ref * I_ref;
    
     
    
     % Perturb the duty cycle
    
     dutyCycle = prevDutyCycle + delta;
    
     
    
     % Measure new power
    
     V_new = getVoltage(dutyCycle);  % Placeholder for actual voltage measurement
    
     I_new = getCurrent(dutyCycle);  % Placeholder for actual current measurement
    
     P_new = V_new * I_new;
    
     
    
     if P_new > P_ref
    
     % Move in the same direction
    
     dutyCycle = dutyCycle + delta;
    
     else
    
     % Move in the opposite direction
    
     dutyCycle = prevDutyCycle - delta;
    
     end
    
     
    
     % Ensure duty cycle is within bounds [0, 1]
    
     dutyCycle = max(0, min(1, dutyCycle));
    
 end

 % 清除当前工作区的所有变量

    
 clear all; close all;
    
  
    
 % 创建新的Simulink模型
    
 modelName = 'PV_System_MPPT_Simulation';
    
 new_system(modelName);
    
 open_system(modelName);
    
  
    
 % 添加光伏电池
    
 add_block('simscape/Electrical/Specialized Power Systems/Fundamental Blocks/Sources/PV Array', [modelName '/PV_Array']);
    
 set_param([modelName '/PV_Array'], 'NumberOfSeriesCells', '72'); % 光伏电池串联数量
    
 set_param([modelName '/PV_Array'], 'NumberOfParallelStrings', '1'); % 光伏电池并联数量
    
 set_param([modelName '/PV_Array'], 'Temperature', '25'); % 初始温度为25°C
    
 set_param([modelName '/PV_Array'], 'Irradiance', '1000'); % 初始光照强度为1000W/m²
    
  
    
 % 添加MPPT控制器
    
 add_block('simulink/User-Defined Functions/MATLAB Function', [modelName '/MPPT_Controller']);
    
 set_param([modelName '/MPPT_Controller'], 'FunctionName', 'mppt_controller'); % 自定义函数名称
    
  
    
 % 添加Buck转换器
    
 add_block('simscape/Electrical/Specialized Power Systems/Power Electronics/Buck Converter', [modelName '/Buck_Converter']);
    
 set_param([modelName '/Buck_Converter'], 'SwitchingFrequency', '50e3'); % 开关频率为50kHz
    
  
    
 % 添加负载电阻
    
 add_block('simscape/Electrical/Specialized Power Systems/Elements/Series RLC Branch', [modelName '/Load_Resistor']);
    
 set_param([modelName '/Load_Resistor'], 'BranchType', 'Res');
    
 set_param([modelName '/Load_Resistor'], 'R', '10'); % 设置电阻值为10Ω
    
  
    
 % 添加电压测量模块
    
 add_block('simscape/Electrical/Specialized Power Systems/Fundamental Blocks/Measurements/Voltage Measurement', [modelName '/PV_Voltage_Measurement']);
    
 add_block('simscape/Electrical/Specialized Power Systems/Fundamental Blocks/Measurements/Voltage Measurement', [modelName '/Load_Voltage_Measurement']);
    
  
    
 % 添加电流测量模块
    
 add_block('simscape/Electrical/Specialized Power Systems/Fundamental Blocks/Measurements/Current Measurement', [modelName '/PV_Current_Measurement']);
    
  
    
 % 添加示波器
    
 add_block('simulink/Sinks/Scope', [modelName '/Scope']);
    
  
    
 % 连接各模块
    
 add_line(modelName, [modelName '/PV_Array'], [modelName '/PV_Voltage_Measurement'], 'autorouting', 'on');
    
 add_line(modelName, [modelName '/PV_Array'], [modelName '/PV_Current_Measurement'], 'autorouting', 'on');
    
 add_line(modelName, [modelName '/PV_Array'], [modelName '/MPPT_Controller'], 'autorouting', 'on');
    
 add_line(modelName, [modelName '/MPPT_Controller'], [modelName '/Buck_Converter/g'], 'autorouting', 'on');
    
 add_line(modelName, [modelName '/Buck_Converter'], [modelName '/Load_Resistor'], 'autorouting', 'on');
    
 add_line(modelName, [modelName '/Load_Resistor'], [modelName '/Load_Voltage_Measurement'], 'autorouting', 'on');
    
 add_line(modelName, [modelName '/PV_Voltage_Measurement'], [modelName '/Scope'], 'autorouting', 'on');
    
 add_line(modelName, [modelName '/PV_Current_Measurement'], [modelName '/Scope'], 'autorouting', 'on');
    
 add_line(modelName, [modelName '/Load_Voltage_Measurement'], [modelName '/Scope'], 'autorouting', 'on');
    
  
    
 % 设置仿真参数
    
 set_param(modelName, 'StopTime', '0.1'); % 模拟运行时间为0.1秒
    
 set_param(modelName, 'Solver', 'ode45');
    
  
    
 % 保存模型
    
 save_system(modelName);