Parallel active filter based on modularization multi-level converter and control method of parallel active filter
A modular multi-level, source filter technology, applied in active power filtering, conversion of AC power input to DC power output, electrical components, etc., can solve problems such as poor power quality in distribution networks
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specific Embodiment approach 1
[0063] Specific implementation mode one: the following combination figure 1 and figure 2 Describe this embodiment mode, the parallel active filter based on modular multilevel converter described in this embodiment mode, it comprises modular multilevel converter 1, and described modular multilevel converter 1 is half-bridge type Topological structure, the upper and lower bridge arms of each phase include n sub-modules SM n , n is a positive integer; it also includes a current conversion unit 2, a harmonic current detection unit 3, a current controller 4, a capacitor C and a grid reactance L S ,
[0064] The capacitor C is connected between the common point +p of the three-phase upper bridge arm and the common point -n of the three-phase lower bridge arm on the DC side of the modular multilevel converter 1;
[0065] Grid reactance L S Connected between the three-phase AC power grid and the three-phase nonlinear load, the output common point PCC of the modular multilevel con...
specific Embodiment approach 2
[0069] Specific implementation mode two: the following combination figure 2 Describe this embodiment, this embodiment will further explain Embodiment 1, the n sub-modules SM described in this embodimentn Each sub-module includes two IBGT tubes, each IGBT tube is connected with a diode in antiparallel, and an energy storage capacitor is connected in series between the collector of the upper side IBGT tube and the emitter of the lower side IBGT tube, modular multilevel converter AC reactor L connected in series between the n submodules of the upper and lower bridge arms of each phase of 1 and the grid current injection terminal of the corresponding phase 0 .
[0070] In this embodiment, the AC bus side of the modular multilevel converter 1 does not need a filter inductor, which saves space and cost. AC reactor L 0 The three-phase circulating current caused by the difference of DC voltage between the bridge arms of each phase of the modular multilevel converter 1 can be suppre...
specific Embodiment approach 3
[0071] Embodiment 3: This embodiment further explains Embodiment 1 or 2. The three-phase nonlinear load described in this embodiment is an RL type three-phase uncontrolled six-pulse rectifier bridge.
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