Novel UPS capacitive non-linear load compensation control strategy
A non-linear load and compensation control technology, applied in reactive power adjustment/elimination/compensation, active power filtering, AC network to reduce harmonics/ripples, etc., can solve complex algorithms and do not take into account the influence of control , It is impossible to directly apply harmonic oscillation suppression and other problems to achieve the effect of suppressing system resonance and good compensation effect
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[0015] As shown in the figure, the novel serial hybrid active power filter of the present invention includes a capacitive nonlinear load, a controller, a phase-locked loop (PLL), a power device, and an active power filter (APF).
[0016] The capacitive non-linear load has a parallel resonant circuit composed of a capacitor and an equivalent inductance of the power grid before the rectifier, and its function is to improve the power factor. UPS capacitive load is a voltage-type harmonic source. What the present invention selects is the UPS of 200kVA twelve-pulse wave phase-controlled rectification device.
[0017] The controller adopts TI's TMS320F2808 32-bit DSP chip with a main frequency of 100MHz. The chip has powerful digital signal processing capability, event management capability and embedded control function.
[0018] The phase-locked loop module is an essential component for any converter connected to the grid, and it is used to track the phase of the grid voltage.
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