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Parallel Active Filter Based on Modular Multilevel Converter and Its Control Method
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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
Active Publication Date: 2015-09-09
HARBIN INST OF TECH
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[0007] The purpose of the present invention is to solve the problem that the existing parallel active filter cannot effectively perform harmonic combination compensation, which makes the power quality of the distribution network poor, and provides a parallel active filter based on a modular multilevel converter device and its control method
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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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Abstract
The invention discloses a parallel active filter based on a modularization multi-level converter and a control method of the parallel active filter and belongs to the technical field of power harmonic suppression in a medium-high voltage high-power occasion. The problem that an existing parallel active filter cannot carry out harmonic combination compensation effectively, so that power distribution network electric energy quality is poor is solved. The filter comprises the modularization multi-level converter, a current transformation unit, a harmonic current detecting unit, a current controller, a capacitor C and a power grid electric reactor LS. The modularization multi-level converter is of a half-bridge-type topological structure, and an upper bridge arm and a lower bridge arm of the modularization multi-level converter respectively comprise n submodules SMn. According to the control method, a carrier phase-shifting modulation method is used, so that under the same switch frequency, equivalent switch frequency is high, switching loss is reduced, meanwhile, a capacitive coupling voltage sharing and ring current suppression strategy is used, and capacitor voltages and direct current bus voltages of the submodules are kept stable. The parallel active filter is used for harmonic suppression of a power grid.
Description
technical field [0001] The invention relates to a parallel active filter based on a modular multilevel converter and a control method thereof, and belongs to the technical field of power harmonic suppression for medium-high voltage and high-power occasions. Background technique [0002] With the rapid development of modern industry, the non-linear loads in the medium-voltage power distribution network are increasing day by day, and the increase of non-linear load devices will cause the power quality of the distribution network to become very bad, causing waveform distortion, reactive power fluctuation and imbalance . Therefore, in order to obtain reliable power supply quality, these power quality problems must be effectively managed. [0003] Passive filters are still the main means of harmonic suppression in medium-voltage power distribution networks, and their own shortcomings determine that they will be gradually replaced by filter devices based on power electronics tech...
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