Open AccessResearch on Control Method of Neutral Point Potential Balance of T-Type Three-level Inverter Based on PLECS
Author(s) -
ZhuoQun Liu,
Jian Ma,
KaiXu Liu
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2087/1/012051
Subject(s) - inverter , midpoint , capacitor , control theory (sociology) , voltage , topology (electrical circuits) , electrical engineering , capacitance , power (physics) , grid tie inverter , engineering , physics , computer science , maximum power point tracking , mathematics , control (management) , electrode , geometry , quantum mechanics , artificial intelligence
The T-type three-level inverter topology has the advantages of low electromagnetic interference, high efficiency, and low output harmonic content. This article combines constant power inverter, independent control of active and reactive power output, Analyzed and studied the neutral point potential balance control of the T-type three-level inverter topology. Through PI adjustment control on the amount of charge of the capacitor, the midpoint voltage of the capacitor is always maintained in a balanced state, and the fluctuation of the midpoint voltage is controlled within ±0.23%. This method can effectively avoid the influence of the difference of capacitance parameters on the DC side on the midpoint voltage. The PLECS software simulation verifies the reliability of the capacitor voltage equalization circuit under the condition of the voltage imbalance at the midpoint of the DC side voltage source supply capacitor voltage equalization.