基于氮化镓的光伏储能逆变系统的设计

Design of Photovoltaic Three-Port Energy Storage Inverter System Based on GaN

为解决光伏发电储能困难,受环境影响且不稳定的问题,提出一种基于氮化镓的光伏三端口储能逆变系统。该系统采用交错并联的BUCK-BOOST三端口变换电路实现最大功率点跟踪(Maximum Power Point Tracking,MPPT)扰动观察法,同步整流技术、串联谐振软开关技术以及选用第三代半导体氮化镓作为功率MOS管,降低了电能损耗,解决了电磁干扰大、出现电磁兼容性等问题,提高了太阳能的利用率并且延长了蓄电池的使用寿命,具备灵活升降压和功率双向流动的特点,结构简单,相对于传统多级变换器提高了功率密度,更适用于光伏储能微网系统。最后,用MATLAB/Simulink仿真模拟并分析不同光照强度下系统的工作状态,仿真结果验证了所提独立光伏三端口逆变系统的正确性及其有效性。

In order to solve the problems of energy storage difficulties,environmental impact and instability of photovoltaic power generation,a gan-based photovoltaic three-port energy storage inverter system is proposed.The system adopts interleave and parallel BUCK-BOOST three-port conversion circuit to realize Maximum Power Point Tracking(MPPT)disturbance observation method,synchronous rectification technology,series resonance soft switch technology and the selection of the third generation semiconductor gallium nitride as the power MOS tube,which reduces the power loss and solves the problems of electromagnetic interference and electromagnetic compatibility.It improves the utilization rate of solar energy and prolongates the service life of batteries,and has the characteristics of flexible voltage rise and fall and power bidirectional flow.Compared with traditional multistage converter,it improves the power density and is more suitable for photovoltaic energy storage micro-grid system.Finally,Matlab/Simulink is used to simulate and analyze the working state of the system under different light intensities.The simulation results verify the correctness and effectiveness of the proposed new independent photovoltaic three-port inverter system.