﻿ 改进两相交错Boost电路在船用光伏系统中的应用
 舰船科学技术  2018, Vol. 40 Issue (8): 99-103 PDF

The application of improved two-phase interleaved Boost circuit in Photovoltaic system
PANG Ke-wang, GUO Chang-xing, ZHANG Ming
School of Electronic Information, Jiangsu University of Science and Technology, Zhenjiang 212003, China
Abstract: Photovoltaic power generation technology has been widely used in ships. But the traditional single Boost circuit has large current ripple and poor output power stability. In this paper, to solve this problem, the operating mode of passive and non-destructive soft-switching and two-phase interleaving technology is analyzed. Then the new circuit is applied to PV maximum power point tracking system. The simulation of PV is completed by MATLAB/SIMULINK. The conventional Boost circuit and improved Boost circuit simulation is completed. The simulation results show that the improved Boost circuit can reduce the current ripple in the circuit and improve the stability of the output power of the photovoltaic system compared with the traditional single Boost circuit.
Key words: soft switch     lossless and passive     interleaving Boost     photovoltaic power generation
0 引　言

1 两相交错Boost电路工作原理

 图 1 两相交错Boost变换器 Fig. 1 Two-phase interleaved Boost converter

 图 2 交错运行电感电流波形 Fig. 2 Waveform of interleaved inductor current

t=t0+DTs时，其中Ts是一个开关周期，

 ${I_m}_{in}' = \frac{{0.5}}{{1 - D}}{I_m} + {I_{\rm min}}\text{，}$ (1)

t=t0+0.5Ts时，

 ${I_{\max }}' = \frac{{0.5 - D}}{{1 - D}}{I_m} + {I_{\max }}\text{，}$ (2)

 ${I_m}' = \frac{{1 - 2D}}{{1 - D}}{I_m}\text{。}$ (3)

2 无源无损软开关

2.1 无源无损软开关电路

 图 3 无源无损Boost电路 Fig. 3 Passive lossless boost circuits
2.2 无源无损软开关模态分析

 图 4 无源无损Boost电路工作模态 Fig. 4 Operating mode of passive lossless Boost circuit

 ${U_{{C_r}}}(t) = \frac{{{C_s}}}{{{C_r} + {C_s}}}{U_O}\left[ {1 - \cos {W_e}(t - t_1)} \right]\text{，}$ (4)
 ${U_{Cs}}(t) = \frac{{{C_r}}}{{{C_r} + {C_s}}}{U_O}\left[ {1 - \cos {W_e}(t - t_1)} \right]\text{，}$ (5)
 ${I_{{L_r}}}(t) = \frac{{{U_O}}}{{{Z_e}}}\sin We(t - t_1)\text{。}$ (6)

 ${Z_e} = \sqrt {\frac{{{L_r}({C_r} + {C_s})}}{{{C_r}{C_s}}}} ,$ (7)
 ${W_e} = \sqrt {\frac{{{C_r} + {C_s}}}{{{L_r}({C_r}{C_s})}}}\text{。}$ (8)

 ${I_{{L_r}}}(t) \!\!=\!\! {I_{{L_r}}}(t_2)\cos {W_{e2}}(t \!-\! t_2) \!\!+\!\! \frac{{{U_{{C_s}}}(t_2)}}{{{Z_{e2}}}}\sin {W_{e2}}(t \!-\! t_2)\text{，}$ (9)
 ${U_{{C_s}}}\!(t) \!\!=\!\! {U_{{C_s}}}(t_2)\cos\! {W_{e2}}\!(t \!\!-\!\! t_2) \!\!+\!\! {Z_{e2}}{I_{{L_r}}}\!(t_2)\sin\! {W_{e2}}(t \!\!-\!\! t_2)\text{。}$ (10)

 ${I_{{L_r}}}(t) = \frac{{{U_{{C_s}}}(t_5)}}{{{Z_{e2}}}}\sin {W_{e2}}(t - t_5)\text{，}$ (11)
 ${U_{{C_s}}}(t) = {U_{{C_s}}}(t_5)\cos {W_{e2}}(t - t_5)\text{。}$ (12)

 $\frac{1}{2}{C_r}{U^2} > \frac{1}{2}{L_r}{I^2} \quad{\text{即}}\,\, \sqrt {\frac{{{L_r}}}{{{C_r}}}} <\frac{U}{I}\text{。}$ (13)

 ${U_{{C_s}}}(t) = {U_{{C_s}}}(t_6) - \frac{1}{{{C_s}}}(t - t_6)\text{。}$ (14)

3 基于改进的Boost电路仿真模型分析

 图 5 封装子模块的软开关单元 Fig. 5 The submodule of the soft switching unit

 图 6 改进Boost电路整体仿真模型 Fig. 6 The simulation model of improved Boost circuit

 图 7 改进Boost和未改进Boost输出功率 Fig. 7 Output power of improved Boost and unmodified Boost circuit

 图 8 输出功率的局部放大图 Fig. 8 Partial amplification of output power

 图 9 两支路电感电流的局部放大图 Fig. 9 Partial amplification of two-channel inductor current

4 结　语

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