Zero-sequence voltage pulse width modulation method, device and system for three-phase four-arm apf
A three-phase four-leg, zero-sequence voltage technology, applied in active power filtering, AC network to reduce harmonics/ripples, etc., can solve the problem of large calculation delay, complex implementation process of 3D-SVPWM strategy, and compensation effect Poor and other problems, to achieve the effect of solving the complex implementation process
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[0035] The present invention will be further described below in conjunction with embodiment and accompanying drawing.
[0036] attached figure 1 It is a system structure diagram of the three-phase four-arm active power filter of the embodiment of the present invention. e a 、e b and e c are the three-phase voltages of the system, u dc is the DC side voltage of the three-phase four-leg APF; L s is the phase inductance of the system, L 1 It is the output filter inductor of the A, B and C bridge arms of the three-phase four-leg APF, L n is the filter inductance of the neutral bridge arm (namely N bridge arm) of the three-phase four-leg APF, C dc It is the DC bus capacitor of the three-phase four-arm APF; S1~S8 is the IGBT switch tube with anti-parallel diodes of the three-phase four-arm APF (S1~S8 also represent the control pulse signal of the corresponding switch tube), and the IGBT is insulated Gate bipolar transistors, IGBT switch tubes S1 and S2 are connected to form t...
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