Saturated switching control method for three-phase parallel active power filter
A technology of power filter and control method, which is applied in the direction of active power filter, harmonic reduction device, AC network to reduce harmonic/ripple, etc., and can solve problems such as low precision and system stability influence
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[0041] The present invention will be further described below in conjunction with accompanying drawings and examples.
[0042] The principle of three-phase APF is as follows: figure 1 shown. In the figure: L is the three-phase filter inductor; C is the DC side capacitor; R is the equivalent resistance of the inductor; ej (j=a,b,c) is the system power supply voltage; v dc is the DC capacitor voltage; i Lj is the nonlinear load current; i sj is the supply current; i cj is the compensation current of the three-phase APF; Indicates the harmonic component and reactive component in the load current. The working principle of the three-phase APF is to control the six switching devices S 1 ~S 6 On and off, so that the compensation current i cj Track command current It ensures that the grid side only contains sinusoidal active components; at the same time, the DC side voltage v dc stable at reference voltage According to Kirchhoff's law, the voltage and current equation of ...
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