手把手教你学Simulink实例——基于Simulink的电力电子系统故障诊断与保护仿真实例

 +-------------------+      +------------------+      +-----------------+      +--------------+

    
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|DC Power Supply|----->|Inverter|----->|Load Module|||

    
|(Vdc=24V)|(PWM Signal)|(R, L, C, Motor)|||||

    
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 +-------------------+      +------------------+      +-----------------+      +--------------+
    
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                                                                                   v
    
                                                                         +------------------+
    
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|Fault Detection|

    
|(Overcurrent,|

    
|Overvoltage,|

    
|Short Circuit,|

    
|Open Circuit)|

    
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                                                                         +------------------+
    
||

    
                                                                                   v
    
                                                                         +------------------+
    
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|Protection|

    
|(Circuit Breaker|

    
|or Limiter)|

    
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                                                                         +------------------+

 % 清除当前工作区的所有变量

    
 clear all; close all;
    
  
    
 % 定义PWM频率和周期
    
 PWM_Frequency = 20e3; % PWM频率为20kHz
    
 Initial_Duty_Cycle = 0.5; % 初始占空比为50%
    
  
    
 % 创建一个新的Simulink模型
    
 modelName = 'FaultDiagnosisAndProtection';
    
 new_system(modelName);
    
 open_system(modelName);
    
  
    
 % 添加直流电源模块
    
 add_block('simulink/Sources/DC Voltage Source', [modelName '/DC_Voltage']);
    
 set_param([modelName '/DC_Voltage'], 'Amplitude', '24'); % 设定直流电压为24V
    
  
    
 % 添加逆变器模块
    
 for i = 1:6 % 假设是三相逆变器，每相两个开关
    
     add_block('simulink/Extras/Ideal Switch', [modelName sprintf('/Switch_%d', i)]);
    
     set_param([modelName sprintf('/Switch_%d', i)], 'Ron', '0.1'); % 开关导通电阻
    
 end
    
  
    
 % 添加PWM Generator模块
    
 for i = 1:6
    
     add_block('simulink/Discontinuities/PWM Generator', [modelName sprintf('/PWM_Generator_%d', i)]);
    
     set_param([modelName sprintf('/PWM_Generator_%d', i)], 'Frequency', num2str(PWM_Frequency));
    
     set_param([modelName sprintf('/PWM_Generator_%d', i)], 'Amplitude', '1');
    
     set_param([modelName sprintf('/PWM_Generator_%d', i)], 'PhaseDelay', '0');
    
     set_param([modelName sprintf('/PWM_Generator_%d', i)], 'SampleTime', '1e-6');
    
 end
    
  
    
 % 添加负载模块
    
 % 电阻性负载
    
 add_block('simulink/Sinks/Load', [modelName '/Resistive_Load']);
    
 set_param([modelName '/Resistive_Load'], 'R', '10'); % 设置电阻值为10Ω
    
  
    
 % 电感性负载
    
 add_block('simulink/Continuous/LC Filter', [modelName '/Inductive_Load']);
    
 set_param([modelName '/Inductive_Load'], 'L', '1e-3'); % 设置电感值为1mH
    
  
    
 % 容性负载
    
 add_block('simulink/Continuous/LC Filter', [modelName '/Capacitive_Load']);
    
 set_param([modelName '/Capacitive_Load'], 'C', '100e-6'); % 设置电容值为100μF
    
  
    
 % 电机负载
    
 add_block('simulink/Machines/DC Machine', [modelName '/Motor_Load']);
    
 set_param([modelName '/Motor_Load'], 'RatedVoltage', '24'); % 设置电机额定电压为24V
    
 set_param([modelName '/Motor_Load'], 'RatedSpeed', '1500'); % 设置电机额定转速为1500rpm
    
  
    
 % 添加故障检测模块
    
 % 过电流检测
    
 add_block('simulink/Logic and Bit Operations/Relay', [modelName '/Overcurrent_Detection']);
    
 set_param([modelName '/Overcurrent_Detection'], 'SwitchOnPoint', '5'); % 设置电流阈值为5A
    
  
    
 % 过电压检测
    
 add_block('simulink/Logic and Bit Operations/Relay', [modelName '/Overvoltage_Detection']);
    
 set_param([modelName '/Overvoltage_Detection'], 'SwitchOnPoint', '30'); % 设置电压阈值为30V
    
  
    
 % 添加保护模块
    
 % 断路器
    
 add_block('simulink/Extras/Ideal Switch', [modelName '/Circuit_Breaker']);
    
 set_param([modelName '/Circuit_Breaker'], 'Ron', '0.1'); % 设置断路器导通电阻
    
  
    
 % 限流器
    
 add_block('simulink/Continuous/Saturation', [modelName '/Current_Limiter']);
    
 set_param([modelName '/Current_Limiter'], 'UpperLimit', '5'); % 设置最大电流为5A
    
  
    
 % 添加示波器
    
 add_block('simulink/Sinks/Scope', [modelName '/Scope']);
    
  
    
 % 设置仿真参数
    
 set_param(modelName, 'StopTime', '0.1');
    
 set_param(modelName, 'Solver', 'ode45');
    
  
    
 % 保存模型
    
 save_system(modelName);
    
  
    
 % 运行仿真
    
 sim(modelName);