Control Strategy of Grid-connected Photovoltaic Power System Based on Modular Multilevel Converter

JI Yu; WANG Shengqiang; CHENG Liang; XU Xiaoyi; ZHENG Jianyong

doi:10.13296/j.1001-1609.hva.2018.03.021

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Control Strategy of Grid-connected Photovoltaic Power System Based on Modular Multilevel Converter

更新时间：2025-04-26

- Control Strategy of Grid-connected Photovoltaic Power System Based on Modular Multilevel Converter
- High VoltageApparatus Vol. 54, Issue 3, Pages: 146-153(2018)
- 作者机构：
  
  1. 国网南通供电公司
  2. 国网苏州市吴江区供电公司
  3. 江苏省电力公司
  4. 东南大学电气工程学院
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2018.03.021
  CLC： TM615
- Published：2018
- 稿件说明：
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[1]吉宇,王生强,程亮,徐晓轶,郑建勇.基于MMC的光伏并网发电系统控制策略研究[J].高压电器,2018,54(03):146-153.

JI Yu, WANG Shengqiang, CHENG Liang, et al. Control Strategy of Grid-connected Photovoltaic Power System Based on Modular Multilevel Converter[J]. High voltageapparatus, 2018, 54(3): 146-153.
[1]吉宇,王生强,程亮,徐晓轶,郑建勇.基于MMC的光伏并网发电系统控制策略研究[J].高压电器,2018,54(03):146-153. DOI： 10.13296/j.1001-1609.hva.2018.03.021.

JI Yu, WANG Shengqiang, CHENG Liang, et al. Control Strategy of Grid-connected Photovoltaic Power System Based on Modular Multilevel Converter[J]. High voltageapparatus, 2018, 54(3): 146-153. DOI： 10.13296/j.1001-1609.hva.2018.03.021.

摘要

传统的二、三电平变换器无法满足高电压、大容量光伏发电系统的要求

因此提出一种基于模块化多电平拓扑（MMC）的光伏发电系统。在此系统中

光伏阵列通过Boost电路后集成于MMC的各个子模块中

这样将有效地降低了开关管的电流应力和电压应力

并且增加了系统的电压和容量。针对系统的控制策略进行研究

通过改变子模块Boost电路中开关管的占空比来稳定子模块电容电压

并网系统的MPPT控制和并网控制则通过逆变电路来实现。此外

提出了该系统的保护控制策略。最后

搭建基于MMC光伏并网发电系统的仿真模型和实验样机

仿真和实验结果有效地证明了控制策略的正确性。

Abstract

The traditional two or three level converter can not meet requirements of high voltage and high power capacity for PV system. Therefore

the system which is based on modular multilevel converter（MMC）has been proposed. In this system

the PV array is connected to sub-module through Boost circuit. Compare with the traditional converter

the new structure can reduce current stress and voltage stress

meanwhile it increase the system voltage and capacity due to the expansibility of sub-module. The system control strategy is proposed

the sub-module capacitor voltage regulation is achieved through the double closed-loop control strategy of Boost circuit and the MPPT control is achieved through the inverter. In addition

the protective strategy is proposed. Lastly

the simulation model and the experimental prototype of the system are built and the results verify the correctness of the proposed control strategy.

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