手把手教你学Simulink实例：基于Simulink的电力电子系统动态性能评估仿真实例

 % 添加直流电源模块

    
 add_block('simscape/Electrical/Specialized Power Systems/Fundamental Blocks/Sources/DC Voltage Source', [modelName '/DC_Voltage_Source']);
    
 set_param([modelName '/DC_Voltage_Source'], 'Voltage', '48'); % 设置电压为48V

 % 添加Buck转换器模块

    
 add_block('simscape/Electrical/Specialized Power Systems/Power Electronics/Buck Converter', [modelName '/Buck_Converter']);
    
 set_param([modelName '/Buck_Converter'], 'SwitchingFrequency', '50e3'); % 设置开关频率为50kHz
    
 set_param([modelName '/Buck_Converter'], 'DutyCycle', '0.5'); % 设置占空比为0.5

 % 添加电感模块

    
 add_block('simscape/Electrical/Specialized Power Systems/Elements/Inductor', [modelName '/Inductor']);
    
 set_param([modelName '/Inductor'], 'L', '100e-6'); % 设置电感值为100μH

 % 添加电容模块

    
 add_block('simscape/Electrical/Specialized Power Systems/Elements/Capacitor', [modelName '/Capacitor']);
    
 set_param([modelName '/Capacitor'], 'C', '100e-6'); % 设置电容值为100μF

 % 连接各模块

    
 add_line(modelName, [modelName '/DC_Voltage_Source'], [modelName '/Buck_Converter'], 'autorouting', 'on');
    
 add_line(modelName, [modelName '/Buck_Converter'], [modelName '/Inductor'], 'autorouting', 'on');
    
 add_line(modelName, [modelName '/Inductor'], [modelName '/Capacitor'], 'autorouting', 'on');

 % 添加负载电阻模块

    
 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PID控制器模块

    
 add_block('simulink/Continuous/PID Controller', [modelName '/PID_Controller']);
    
 set_param([modelName '/PID_Controller'], 'P', '1'); % 设置比例系数Kp为1
    
 set_param([modelName '/PID_Controller'], 'I', '0.1'); % 设置积分系数Ki为0.1
    
 set_param([modelName '/PID_Controller'], 'D', '0.01'); % 设置微分系数Kd为0.01

 % 连接各模块

    
 add_line(modelName, [modelName '/Output_Voltage_Measurement'], [modelName '/PID_Controller'], 'autorouting', 'on');
    
 add_line(modelName, [modelName '/PID_Controller'], [modelName '/Buck_Converter/Control_Input'], 'autorouting', 'on');

 % 添加电压测量模块

    
 add_block('simscape/Electrical/Specialized Power Systems/Fundamental Blocks/Measurements/Voltage Measurement', [modelName '/Output_Voltage_Measurement']);

 % 添加电流测量模块

    
 add_block('simscape/Electrical/Specialized Power Systems/Fundamental Blocks/Measurements/Current Measurement', [modelName '/Inductor_Current_Measurement']);

 % 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');

 % 获取输出电压数据

    
 outputVoltage = getOutputVoltage();
    
  
    
 % 计算上升时间和调节时间
    
 riseTime = calculateRiseTime(outputVoltage); % 自定义函数计算上升时间
    
 settlingTime = calculateSettlingTime(outputVoltage); % 自定义函数计算调节时间
    
  
    
 % 显示结果
    
 disp(['Rise Time: ', num2str(riseTime), ' seconds']);
    
 disp(['Settling Time: ', num2str(settlingTime), ' seconds']);

 % 计算超调量

    
 overshoot = calculateOvershoot(outputVoltage); // 自定义函数计算超调量
    
  
    
 // 显示结果
    
 disp(['Overshoot: ', num2str(overshoot), '%']);

 % 计算输入功率和输出功率

    
 inputVoltage = getInputVoltage();
    
 inputCurrent = getInputCurrent();
    
 outputVoltage = getOutputVoltage();
    
 outputCurrent = getOutputCurrent();
    
  
    
 inputPower = mean(inputVoltage .* inputCurrent); % 输入功率
    
 outputPower = mean(outputVoltage .* outputCurrent); % 输出功率
    
  
    
 efficiency = (outputPower / inputPower) * 100; % 计算效率百分比
    
 disp(['System Efficiency: ', num2str(efficiency), '%']);

 % 获取输出电压数据

    
 outputVoltage = getOutputVoltage();
    
  
    
 % 进行FFT分析
    
 fftOutputVoltage = fft(outputVoltage);
    
 frequencies = linspace(0, 1/(2*Ts), length(outputVoltage)/2+1); % Ts为采样时间间隔
    
 powerSpectrum = abs(fftOutputVoltage(1:length(outputVoltage)/2+1)).^2;
    
  
    
 % 绘制频谱图
    
 figure;
    
 plot(frequencies, powerSpectrum);
    
 xlabel('Frequency (Hz)');
    
 ylabel('Power Spectrum');
    
 title('Output Voltage Ripple and Noise Analysis');

 % 启动PID Tuner工具

    
 pidTuner([modelName '/PID_Controller']);

 % 调整PID控制器参数

    
 set_param([modelName '/PID_Controller'], 'P', '1.2'); % 增加比例系数Kp
    
 set_param([modelName '/PID_Controller'], 'I', '0.15'); % 增加积分系数Ki
    
 set_param([modelName '/PID_Controller'], 'D', '0.02'); % 增加微分系数Kd
    
  
    
 % 重新运行仿真
    
 sim(modelName);

 % 调整电感和电容参数

    
 set_param([modelName '/Inductor'], 'L', '150e-6'); % 增加电感值L
    
 set_param([modelName '/Capacitor'], 'C', '150e-6'); % 增加电容值C
    
  
    
 % 重新运行仿真
    
 sim(modelName);