Control method of three-phase PWM rectifier based on system online identification
一种控制方法、整流器的技术,应用在输出功率的转换装置、交流功率输入变换为直流功率输出、电气元件等方向,能够解决降低三相PWM整流器稳态性能、降低三相PWM整流器动态性能等问题,达到解决参数失配问题、结构简单、好辨识效果的效果
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[0041] This embodiment will be further described in conjunction with the accompanying drawings.
[0042] Step 1, as attached figure 1 As shown in the topology of the three-phase PWM rectifier, the three-phase input AC side voltage u is collected a , u b , u c , AC side current i a i b i c ;
[0043] Step 2. Establish the mathematical model of the PWM rectifier in the three-phase stationary coordinate system according to KCL and KVL, the expression is as follows:
[0044]
[0045] where u sa , u sb , u sc is the voltage at the input terminal of the rectifier, L is the inductance of the bridge arm side, and R is the equivalent resistance;
[0046] Utilize the phase-locked loop PLL to obtain the current phase θ=ωt of the grid voltage, where ω represents the power frequency rotation angular velocity of the grid;
[0047] The above formula can be written as
[0048] and
[0049] also because
[0050] so
[0051] so In the above formula where θ=ωt, so der...
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