Voltage-type PWM (pulse width modulation) rectifier power compensation control method under asymmetrical power grid faults
A technology for power compensation and grid voltage, which is applied in the control of voltage-type PWM rectifiers and the power compensation control field of voltage-type PWM rectifiers under grid asymmetry faults, which can solve the problem of reducing the dynamic response of the system, increasing the complexity of the controller, and increasing the calculation of the control scheme. It can improve the operation ability, simplify the algorithm, and achieve the effect of stable control.
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[0012] Embodiments are described in detail with reference to the accompanying drawings. The main circuit structure of the three-phase voltage PWM rectifier is as follows: figure 1 shown. figure 1 middle, u ga , u gb , u gc It is a three-phase voltage source on the AC side; i ga , i gb , i gc is the three-phase AC side current; u ca , u cb , u cc is the three-phase voltage at the input side of the power bridge; u dc is the DC side voltage; L g with R g Respectively, the incoming inductance and its equivalent resistance; C Is the DC filter capacitor; O is the grid midpoint; i L is the load current, the DC side load is determined by the resistor R L equivalent representation.
[0013] Under the condition that the three-phase voltage of the power grid is balanced and stable, the mathematical model of the PWM rectifier in the synchronous rotating coordinate system can be obtained:
[0014] (1)
[0015] u gd , u gq Respectively, ...
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