Decoupling Control for the HVAC Port of Power Electronic Transformer

Wusong Wen, Tianwen Zhan (), Yingchao Zhang and Jintong Nie
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Wusong Wen: Key Laboratory of Military Special Power Supply, Communication NCO Academy of PLA, Chongqing 400035, China
Tianwen Zhan: Key Laboratory of Military Special Power Supply, Communication NCO Academy of PLA, Chongqing 400035, China
Yingchao Zhang: Key Laboratory of Military Special Power Supply, Communication NCO Academy of PLA, Chongqing 400035, China
Jintong Nie: Key Laboratory of Military Special Power Supply, Communication NCO Academy of PLA, Chongqing 400035, China

Energies, 2025, vol. 18, issue 15, 1-19

Abstract: For the high-voltage AC port of power electronic transformer (HVAC-PET) with three-phase independent DC buses on the low-voltage side, a decoupling control strategy, concerning the influence of grid voltage imbalance, three-phase active-load imbalance, and high-order harmonic distortion, is proposed in this paper to simultaneously realize the functions of active power control, reactive power compensation, and active power filtering. In the outer power control loop, according to the distribution rule of decoupled average active power components in three phases, stability control for the sum of cluster average active power flows is realized by injecting positive-sequence active current, so as to control the average cluster voltage (i.e., the average of all the DC-link capacitor voltages), and by injecting negative-sequence current, the cluster average active power flows can be controlled individually to balance the three cluster voltages (i.e., the average of the DC-link capacitor voltages in each cluster). The negative-sequence reactive power component is considered to realize the reactive power compensation. In the inner current control loop, the fundamental and high-order harmonic components are uniformly controlled in the positive-sequence dq frame using the PI + VPIs (vector proportional integral) controller, and the harmonic filtering function is realized while the fundamental positive-sequence current is adjusted. Experiments performed on the 380 V/50 kVA laboratory HVAC-PET verify the effectiveness of the proposed control strategy.

Keywords: power electronic transformer; decoupling control; active power control; reactive power compensation; active power filtering (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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