光伏组网单元直流侧蓄电池储能系统研究

采用了双向半桥Dc/Dc对光伏组网单元直流侧蓄电池进行充放电控制;简单说明了VSI逆变器的结构和原理:分析了双向DC/DC变换器电感电容的选取方法。通过搭建以蓄电池储能为核心的仿真模块,采用功率外环电流内环、电压外环电流内环这两种控制方式,分别在光照强度变化不大以及光照有大幅度跌落这两种情况下进行了仿真分析。仿真结果验证了这两种控制方法在稳定逆变器输出以及直流母线电压的有效性,也体现了功率外环电流内环控制的优越。

The Research for DC Battery Energy Storage of Photovoltaic Networking System

This paper studies the control strategies of charging and discharging of photovoltaic network unit battery by using Bidirectional half-bridge DC/DC converter. It explains the structure and working principle of VSl（Virtual Switch Interface） and analyzes the selection methods of appropriate inductance capacitance value for Bidirectional halfbridge DC/DC converter. By setting up the battery energy storage as the core simulation module, in this paper ,it uses two kinds of control methods： power outer loop and current inner loop, and voltage outer loop and current inner loop. The two control methods are respectively simulated and analyzed in different conditions： stable Illumination Intensity and obvious change on illumination intensity. Results verify that the two control methods can enable the inverter to produce high quality output voltage and DC-link voltage and can be applied in practice, and power outer loop and current inner loop is better than the other.