光伏并网三相电流型多电平变流器拓扑与控制

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摘要由于光伏电池具有电流源输出特性,因此电流型变流器非常适合于光伏并网系统。采用多电平结构,具有输出电流波形正弦度好、输出电流控制直接、开关器件电流应力低以及等效开关频率高等优点。提出一种三相电流型多电平变流器光伏并网系统,采用两组光伏电池阵列供电。通过插入一级直流-直流变换电路,实现最大功率点跟踪独立控制。网侧采用一种新型三相电流型多电平变流器,通过移植电压型多电平变流器的PD-PWM技术,有效减小入网电流谐波畸变。结合锁相环与功率解耦控制,提出基于电流型多电平变流器的并网控制策略,实现网侧的任意功率因数运行。基于PSIM仿真环境搭建系统模型,仿真结果说明了光伏并网三相电流型多电平变流器拓扑与控制的有效性。

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	鲍建宇
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关键词 ：光伏并网, 电流型多电平变流器, 最大功率点跟踪, PD-PWM 功率因数

Abstract：Since photovoltaic cell behaves the characteristics of current source, current-source converter (CSC) is suitable for grid-connected photovoltaic (PV) system. Using multilevel structure has the advantages of good sinusoidal current wave, direct control to output current, low current stress for switching device and high equivalent switching frequency. A grid-connected PV system based on a new three-phase multilevel CSC is proposed, herein two PV modules are used as the DC supplies. Two DC-DC converters are inserted behind PV modules to implement maximum power point tracking (MPPT). On the grid side, a new three-phase multilevel CSC is used as grid-connected converter, by implanting PD-PWM technique of multilevel voltage-source converter (MVSC) into such multilevel CSC, which can effectively reduce the harmonic distortion. Combined with phase lock loop (PLL) and power decoupling control, the grid-connected strategy for such multilevel CSC is obtained to achieve random power factor (PF) operation. All the proposed concepts are verified by simulation models built in PSIM.

Key words： Photovoltaic grid-connection current-source multilevel converter maximum power point tracking PD-PWM power factor

收稿日期: 2014-04-22 出版日期: 2016-04-28

PACS:

TM464

基金资助:国家自然科学基金（51277164）和浙江省自然科学基金（Y1111002）资助项目

通讯作者: 鲍建宇男,1976年生,博士,副教授,研究方向为电流型多电平变流技术。E-mail: jianyu_bao@126.com E-mail: baoweibing@zjut.edu.cn

作者简介: 鲍卫兵女,1966年生,硕士,副教授,研究方向为工业自动化应用技术。E-mail: baoweibing@zjut.edu.cn

引用本文:

鲍建宇, 鲍卫兵, 李玉玲. 光伏并网三相电流型多电平变流器拓扑与控制[J]. 电工技术学报, 2016, 31(8): 70-75. Bao Jianyu, Bao Weibing, Li Yuling. Topology and Control of Three-Phase Multilevel Current-Source Converter for Photovoltaic Grid-Connection. Transactions of China Electrotechnical Society, 2016, 31(8): 70-75.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2016/V31/I8/70

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