具备电压质量调节能力的串并联一体化多功能变流器

doi:10.19595/j.cnki.1000-6753.tces.191696

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摘要

针对微电网中突出的电压质量问题和新能源的消纳需求,提出一种可同时实现电压质量调节和并网功率调控的串并联一体化变流器,简称多功能变流器（MFC）。在单相全桥逆变器的基础上,通过构造和复用直流侧电容支路,所提拓扑便可解耦和独立控制逆变器两桥臂,从而实现对其输出电压和输出电流的独立控制,同时实现多种功能。根据电网状况将其分为两种工作模式：电网电压正常时,工作于并网功率调控模式,实现对新能源发电的充分利用;电网电压波动时,工作于功率调控兼电压调节模式,可同时实现对功率的调控和对电压波动的补偿。该文首先详细分析了不同模式下电路的导通状态,建立电路模型说明原理;然后设计了控制策略并分析稳态误差;最后利用Simulink仿真及RT-LAB硬件在环实验,验证了所提拓扑与控制方法的正确性和有效性。

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关键词 ：电压质量调节, 功率调控, 多功能变流器, 解耦控制

Abstract：

Aiming at the prominent voltage quality problems and the demand for new energy consumption in microgrid, a series-parallel integrated converter, which can realize both voltage quality adjustment and grid-connected power regulation, is proposed, and referred to as multifunctional converter (MFC). Based on the single-phase full-bridge inverter, by constructing and reusing the DC-side capacitor branch, the proposed topology can decouple and independently control the two bridge arms of the inverter, so as to realize the independent control of the output voltage and output current, and realize multiple functions at the same time. According to the grid conditions, it can be divided into two working modes: when the grid voltage is normal, it works in the grid-connected power regulation mode to realize the full utilization of new energy generation; when the grid voltage fluctuates, it works in the power regulation and voltage adjustment mode to realize the regulation of power and the compensation of voltage fluctuation at the same time. In this paper, firstly, conduction state of the circuit in different modes is analyzed in detail, and the circuit model is established to explain its principle; then the control strategy is designed and the steady-state error is analyzed; finally, the correctness and effectiveness of the proposed topology and control method are verified by Simulink simulation and RT-LAB hardware in the loop experiment.

Key words： Voltage quality adjustment power regulation multifunctional converter decoupling control

收稿日期: 2019-12-05

PACS:

TM464

基金资助:

国家自然科学基金青年基金（52007059）和湖南省科技领军人才计划（2019RS3014）资助项目

通讯作者: 郭祺男,1993年生,博士研究生,研究方向为电力电子变换器、分布式发电与电能质量先进控制。E-mail：qguo_215@163.com

作者简介: 涂春鸣男,1976年生,教授,博士生导师,研究方向为电力电子在电力系统中的应用、智能配电网、分布式能源与微电网等。E-mail：chunming_tu@263.net

引用本文:

涂春鸣, 李庆, 郭祺, 高家元, 姜飞. 具备电压质量调节能力的串并联一体化多功能变流器[J]. 电工技术学报, 2020, 35(23): 4852-4863. Tu Chunming, Li Qing, Guo Qi, Gao Jiayuan, Jiang Fei. Research on Series-Parallel Integrated Multifunctional Converter with Voltage Quality Adjustment. Transactions of China Electrotechnical Society, 2020, 35(23): 4852-4863.

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