Matlab Simscape Electrical基础 2020-03-27

Simscape Electrical基础

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• Ctrl+L 快速定位模块在库中位置；
• Ctrl+R 模块右转
• Ctrl+Shift+R 模块左转
• 空白处双击，搜索模块名/添加Annotation

Specialized Power Systems

Build and Simulate a Simple Circuit
Build a simple circuit using Simscape Electrical Specialized Power Systems blocks and connect it to other Simulink blocks.

• 一般需要powergui block或solver configuration；
• 使用sum block叠加多个信号，如给输入加特定频率谐波；
• use the Controlled Voltage Source block to inject a voltage in an electrical circuit;
• 电压源和电容不能直接串联，应串入小电阻；电流源和电感不能直接并联，并入大电阻。

Analyze a Simple Circuit
Use the Powergui block to analyze static and frequency-domain response.

• measure the impedance versus frequency
• 命令画伯德图如何控制对数坐标还是普通坐标？？AC Current Source注入小信号幅值为什么是0？这个文档写的很差。

freq=0:5000;
w=2*pi*freq;
bode(sys1(1,2),w);

Specify Initial Conditions
Specify initial conditions for state variables using the Simscape Electrical Specialized Power Systems powergui block.

• powergui中可以设置仿真变量初值，为0、稳态或任意给定值。

About Electrical Modeling and Simulation

• Simscape Electrical Block Libraries
  Use the Simscape Electrical block libraries to model and analyze electronics, mechatronics, and electrical power systems.

  You can connect Specialized Power Systems blocks to Simulink blocks either:
  1. Directly, through Simulink signal input and output ports;
  2. Through measurement blocks from the Measurements sublibrary of the Fundamental Blocks library. 如ssc_new_elec中包含的controlled voltage source和voltage sensor;
  3. use blocks from the Simscape > Electrical > Specialized Power Systems > Fundamental Blocks > Interface Elements library to interface between them;
  4. 如ssc_new中展示的，使用PS-Simulink Converter和Simulink-PS Converter进行信号转换。
  ————————————————————
  命令访问simscape模块库
  - simscapepowersystems_ST
  - ee_lib
  ————————————————————

• Modeling Analog Circuit Architectures, Mechatronic Systems, and Electrical Power Systems Using Simscape Electrical
  Model mechatronic systems, analog circuit architectures, and single and multi-phase electrical power systems that you can connect to networks in other Simscape domains.
• Per-Unit System of Units
  Use the per-unit (pu) system to simplify electrical power system simulation calculations and analysis.

• Simulating an Electronic, Mechatronic, or Electrical Power System

  • solver
    de23t and ode15s, are recommended for most applications because they run faster and work better for systems with a range of both fast and slow dynamics. The ode23t solver is closest to the solver that SPICE traditionally uses；
    To use Simulink^® Coder™ software to generate standalone C or C++ code from your model, you must use the ode14x or ode1be solvers. For more information about code generation, see Code Generation (Simscape).
  • errors
    为开关增加电阻和结电容来避免不稳定震荡。example：>> Astable Oscillator ；
    Read Troubleshooting Simulation Errors (Simscape) to learn about general troubleshooting techniques.
    注意不要丢失参考信号，如Ground，see Grounding Rules.

电力电子例子

>> Specialized Power Systems — Examples