电工技术学报  2017, Vol. 32 Issue (8): 220-228    DOI:
电力电子 |
一种适用于小功率可再生能源的单相高频双Buck全桥并网逆变器
孟准, 王议锋, 杨良
天津大学智能电网教育部重点实验室 天津 300072
A Single-Phase High Frequency Dual-Buck Full-Bridge Inverter for Small-Scale Renewable Source Application
Meng Zhun, Wang Yifeng, Yang Liang
Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin 300072 China
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摘要 提出一种适合小功率可再生能源并网发电应用的单相高频双Buck全桥并网逆变器。基于全碳化硅(SiC)功率器件,逆变器工作频率可达100kHz,有效减小了电感体积,同时使并网电流纹波降低。进一步分析逆变器的控制策略:采用电压电流双环控制,在电流环利用一种三极点三零点(3P3Z)控制器使得受控并网电流快速跟踪电压环产生的电流给定,并采用一种简单线性化算法快速产生控制占空比信号,实现高频变换;电压环采用双极点双零点(2P2Z)控制器,在产生电流内环给定幅值的同时,控制输入侧直流母线电压稳定在电压给定值,使得逆变器能够向电网传输能量的同时维持母线电压恒定;逆变器采用一种二阶广义积分软件锁相环(SOGI- SPLL)产生与电网电压相位相同的相位信号。最后,通过实验样机对逆变器理论分析的有效性进行了验证。
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孟准
王议锋
杨良
关键词 碳化硅功率器件并网发电双Buck逆变器高频变换软件锁相环    
Abstract:A single-phase high frequency dual-Buck full-bridge inverter for small-scale renewable source application is proposed in this paper. Based on the entire SiC power switches, the proposed inverter can operate in a high frequency at 100 kHz, and thus both the inductor volume and the ripple of the grid-connected current are reduced. This paper also analyzes the control strategy of the inverter, where a voltage-current dual loop controller is employed. In the current loop, a three-pole-three-zero (3P3Z) compensator is applied to make sure that the grid-connected current can fast track the current reference generated by the voltage loop. A simple linearization algorithm is also adopted to calculate the controlling duty cycle, to achieve high frequency operation. Besides producing the current reference, the voltage loop employs a two-pole-two-zero (2P2Z) compensator to stabilize the bus voltage at the voltage reference, so that the inverter can delivery power to the grid and regulate bus voltage simultaneously. Moreover, a second-order generalized integrator software phase lock loop (SOGI-SPLL) is used to generate the phase signal, which has the same phase with grid voltage. At last, prototype experiment has verified the theoretical analyses.
Key wordsSiC    power    switch,    grid-connected    generation,    dual-Buck    inverter,    high    frequency    conversion,    software    phase    lock    loop   
收稿日期: 2016-08-20      出版日期: 2017-05-02
PACS: TM464  
基金资助:国家高技术研究发展计划(863计划)(2015AA050603)和天津市科技支撑计划重点项目(14ZCZDGX00035)资助
作者简介: 孟 准 男,1984年生,博士研究生,研究方向为高频逆变器。E-mail: quakermaster@hotmail.com;王议锋 1981年生,博士,副教授,研究方向为先进电力电子技术在电网中的应用。E-mail: wayif@tju.edu.cn(通信作者)
引用本文:   
孟准, 王议锋, 杨良. 一种适用于小功率可再生能源的单相高频双Buck全桥并网逆变器[J]. 电工技术学报, 2017, 32(8): 220-228. Meng Zhun, Wang Yifeng, Yang Liang. A Single-Phase High Frequency Dual-Buck Full-Bridge Inverter for Small-Scale Renewable Source Application. Transactions of China Electrotechnical Society, 2017, 32(8): 220-228.
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