Optimization control method based on selective harmonic elimination pulse width modulation (SHEPWM)
An optimized control, fundamental wave technology, applied in output power conversion devices, irreversible DC power input conversion to AC power output, electrical components, etc., can solve the problem of high amplitude of residual harmonic components and lack of residual harmonic components. control, high harmonic content, etc.
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[0047] The present invention will be further described in detail below in conjunction with the drawings.
[0048] Such as figure 1 , Provide an optimized control method based on SHEPWM, the method includes the following steps:
[0049] Step 1: List the amplitude expressions of the fundamental wave and each controlled harmonic;
[0050] Step 2: Determine the amplitude of the fundamental wave and each controlled harmonic;
[0051] Step 3: Obtain the switch angle.
[0052] In the step 1, the Fourier expression of the expected output square wave is:
[0053] F ( ωt ) = X i = 1 ∞ ( a i sin iωt + b i cos iωt ) - - - ( 1 )
[0054] The amplitude of each harmonic α i And b i , Because of symmetry
[0055] b i = 0 i = 1,2,3 , . . . a i = 0 i = 2,4,6 , . . . a i = 4 E iπ X k = 1 N ( - 1 ) k + 1 cos ( iα k ...
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