摘要
提出一种基于双主动全桥(DAB)变换器多光伏阵列并列输入、级联逆变输出的高频隔离型光伏并网系统。分析了DAB变换器的功率传输能力,设计了其移相控制策略;针对各输入端光伏阵列光照强度不同带来的功率不平衡问题,基于dq解耦控制数学模型,设计了级联多电平DC/AC变换器的调制量补偿控制策略,实现了各直流端电压的平衡控制。在PSCAD/EMTDC中搭建了4.5 MW/10 kV光伏并网模型进行仿真,仿真结果验证了系统结构的可行性以及所提控制策略的有效性。
A high frequency isolated grid-connected PV system based on DAB（Dual Active Bridge） converter is proposed,with paralleled inputs and cascaded inverter outputs of multi PV arrays. The power transmission ability of DAB converter is analyzed and its phase-shifting control strategy is designed. Aiming at the power imbalance caused by different illumination intensities on the input-side of PV arrays,the modulation compensation control strategy for cascaded multi-level DC/AC converter is established based on the mathematical model of dq decoupling control,realizing the voltage balance control of DC sides. The model of a 4.5 MW/10 kV grid-connected PV system is built with PSCAD/EMTDC,whose simulative results verify the feasibility of the system structure and the effectiveness of the proposed control strategy.
出处
《电力自动化设备》
EI
CSCD
北大核心
2017年第10期43-48,共6页
Electric Power Automation Equipment
基金
国家自然科学基金资助项目(51277024)~~
