TMS320F2800137: 锁相环软件设计仿真--频移

参考下文档中的这段话，上图只是相关的测试结果：

Before coding the SPLL structure it is essential to simulate the behavior of the PLL for different conditions on the grid. Fixed-point processors are used, for their for lower cost in many grid tied converters. IQ Math is a convenient way to look at fixed point numbers with a decimal point. C2000 IQ math library provides built-in functions that can simplify handling of the decimal point by the programmer. However, coding in fixed point can have additional issues of dynamic range and precision; therefore, it is better to simulate the behavior of fixed-point processors in a simulation environment. Hence, MATLAB® is used to simulate and identify the Q point at which the algorithm needs to run. Below, is the MATLAB script using the fixed-point toolbox that tests the PLL algorithm with varying grid condition.