Current Improvement for D-Σ Digital Controlled Three-Phase Bi-directional Inverter with Wide Inductance Variation

被引:0
|
作者
Wu, T. -F. [1 ]
Chang, Y. -Y. [1 ]
Chang, C. -H. [1 ]
Zou, T. -C. [1 ]
Chang, Y. -R. [2 ]
机构
[1] Natl Tsing Hua Univ, Dept Elect Engn, EPEARL, Hsinchu 30013, Taiwan
[2] Atom Energy Council, INER, Div Engn, Taoyuan 32546, Taiwan
关键词
D-Sigma digital control; region selection; D-Sigma transformation and inverter; PREDICTIVE CURRENT CONTROL; DIRECT POWER-CONTROL; CONVERTERS; MODULATION;
D O I
暂无
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
A division-summation (D-Sigma) digital control for three-phase inverters to achieve active and reactive power injection has been presented. It can overcome the limitation of abc to dq frame transformation. However, the D-Sigma control requires four sets of control laws to cover four quadrant operations: grid connection (PF 1 similar to +/- 0.866), rectification with power factor correction, PF leading (0 similar to 0.866), and PF lagging (0 similar to -0.866). Moreover, the switching sequences for the four modes are also different from each other, increasing complexity of firmware programming. In this paper, improvement of the control-law derivation and region selection for the D-Sigma digital control is presented. By selecting the zero crossing points of phase voltages as region transitions, the control laws and the related parameter tables for the four modes can be unified to a general form. The switching sequences of the four modes are also unified to the switching pattern of the grid-connection mode. Additionally, a D-Sigma transformation matrix is identified to simplify the derivation procedure of the division (D) and summation (Sigma), which can obtain the control law directly. Measured results from a 10 kVA 3 empty set bi-directional inverter have been presented to confirm the improvement.
引用
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页数:6
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