A Power Mismatch Elimination Strategy for an MMC-Based Photovoltaic System

被引：70

作者：

Bayat, Hasan ^{[1
]}

Yazdani, Amirnaser ^{[2
]}

机构：

[1] Western Univ, Dept Elect & Comp Engn, London, ON N6A 3K7, Canada

[2] Ryerson Univ, Dept Elect & Comp Engn, Toronto, ON M5B 2K3, Canada

来源：

IEEE TRANSACTIONS ON ENERGY CONVERSION | 2018年 / 33卷 / 03期

关键词：

Differential current; control; energy conversion; integration; modular multilevel converter; power electronics; power mismatch; photovoltaic; MODULAR MULTILEVEL CONVERTER; DC-DC CONVERTER;

D O I：

10.1109/TEC.2018.2819982

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：

This paper proposes a power mismatch elimination strategy for a medium-voltage modular multilevel converter (MMC) -based photovoltaic (PV) system. In the MMC-based PV system, each submodule of the MMC is energized by multiple PV generators, each interfaced with the de port of the submodule by a corresponding isolated dual active bridge dc-dc converter. This configuration allows for a transformerless connection to the host grid and independent maximum power point tracking for the PV generators. The paper then proposes a power mismatch elimination strategy that ensures that the current delivered to the host grid is balanced in spite of unbalanced PV generator outputs. The proposed power mismatch elimination strategy employs a dc differential current to equalize the leg powers, and an ac differential current to stabilize the dc voltages of the submodules. The effectiveness of the proposed power mismatch elimination strategy is demonstrated by time-domain simulations conducted on a model of the PV system in PSCAD/EMTDC software environment.

引用

页码：1519 / 1528

页数：10

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