摘要
现有的集中式光储一体化系统为提高输出电流,一般将多个光伏组件并联,但这种结构在局部阴影下能量利用效率较低;而将每个光伏组件经过DC/DC变换器接入直流母线的方案虽能提高光伏利用率,但变换器的容量和成本较高。为此提出一种新型光储一体化系统的电路结构及其控制方法:首先将光伏组件和DC/DC变换器的输出端串联后接入直流母线,实现所有光伏组件的最大功率跟踪控制,与现有方案相比大幅降低了DC/DC变换器的电压等级和成本;继而设计适用于该光储一体化系统的能量管理策略,在保证蓄电池荷电状态不超过允许范围的前提下,可实现整个光储一体化系统并网功率的分时恒定。最后,在RT-LAB半实物仿真平台上验证所提系统结构和控制策略的有效性。
The existing centralized PV-energy storage system,which combines multiple PV-modules in parallel to improve the output current,has low energy utilization efficiency in partially shaded conditions,while the scheme of connecting each PV module to the DC bus through DC/DC converter can improve utilization efficiency of PV modules,but it requires high-power DC/DC converters,which significantly increases the construction cost of the system.In view of the above problems,a novel PV-energy storage system circuit structure and control methods are proposed in this paper.The output of the PV module and the DC/DC converter is connected to the DC bus after series,enabling maximum power point tracking(MPPT)control of all PV modules,which significantly reduces the voltage level and cost of DC/DC converters compared to the existing schemes.At the same time,the energy management strategy applicable to the proposed system is designed,and the time-sharing constant of the grid-connected power is realized under the premise of ensuring that the battery state of charge does not exceed the permissible range,and improves the grid friendliness of the system.Finally,the experimental platform of the proposed PV-energy storage system is established through RT-LAB,and the circuit structure and control method of the system are verified.
作者
王镇浩
张宏
何炳杰
袁伟轩
陈思哲
WANG Zhenhao;ZHANG Hong;HE Bingjie;YUAN Weixuan;CHEN Sizhe(School of Automation,Guangdong University of Technology,Guangzhou,Guangdong 510006,China)
出处
《广东电力》
2020年第4期1-8,共8页
Guangdong Electric Power
基金
国家自然科学基金项目(61802070)。
关键词
光储一体化系统
最大功率跟踪
局部阴影
能量管理
分时恒功率
PV-energy storage system
maximum power point tracking(MPPT)
partial shadow
energy management
time-sharing constant power
作者简介
王镇浩(1994),男,广东普宁人,在读硕士研究生,主要研究方向为新能源发电及并网控制,E-mail:wzhreaesrch@126.com;张宏(1995),男,江西吉安人,在读硕士研究生,主要研究方向为新能源发电及并网控制;何炳杰(1995),男,广东江门人,在读硕士研究生,主要研究方向为新能源发电及并网控制;袁伟轩(1994),男,广东中山人,在读硕士研究生,主要研究方向为新能源发电及并网控制;陈思哲(1981),男,广东汕头人,副教授,硕士生导师,工学博士,主要从事电力电子与电力传动、新能源发电、锂电池能量管理等领域的研究。
