500kW光伏并网逆变器整机结构设计

Structural Design of 500kW Photovoltaic Grid-connected Inverter

500kW光伏并网逆变器是大功率光伏逆变器中的主流机型,具有容量大和体积大等特点。本设计中采用独立柜体结构解决较大功率逆变器的整体布局,将独立柜体采用隔板进行有效分隔形成各具功能的箱体。首先将独立柜体进行左右隔离,左边用作直流侧箱体,右边用作交流侧箱体,然后再对左右箱体采用隔板进行前后分隔,分隔之后形成具有各自功能的箱体,箱体与箱体之间既相互隔离,又相互关联,箱体与箱体之间的距离很近,器件与器件之间连接短、转接少、节省材料,有效减小整机设备的体积。利用分隔箱体的自身结构和隔板自然形成散热风道,散热风道有效散热并且相互之间互不干扰,具有较高的散热效率。整机设备总体积缩小、结构紧凑,器件的中间连接变短,材料成本得到有效降低,运输、存储和装配成本均得到有效降低,转接部件减少,整机设备的可靠性得到相应提高。

500 kW photovoltaic grid-connected inverter is a mainstream model in high-power photovoltaic inverters, with the characteristics of large capacity and large volume. In this design, separate cabinet structures are used to solve the overall layout of large power inverter, and separate cabinets are separated with partitions to effectively form boxes with various functions. First, the separate cabinets are separated from the left to the right, with DC side box on the left side and AC side box on the right side. Then, the separate cabinets are separated from the front to the rear. The cabinets are separated into boxes with various functions, which are isolated but connected to each other. The distance between the cabinets is very short, and the connection between the devices is short, which has small transfer and saves materials, thus effectively reducing the volume of the entire device. Heat-dissipating air ducts are naturally formed with the structure of the boxes and the partitions, which effectively dissipate heat and do not interfere with each other, possessing high heat dissipation efficiency. The entire device has a reduced volume and compact structure, and the connection between the devices is shortened. Therefore, the material cost is effectively reduced, and correspondingly, the costs of transportation, storage and assembly are reduced. The number of connective parts is reduced, and the reliability of the entire device is correspondingly improved.