摘要
探索一种串联式中高压光伏方阵及系统实现方法,目的是解决组件串联数量受光伏组件的耐压≤1000V所限的问题。为提高发电功率,目前光伏电站采用若干台的汇流设备将大量的光伏组串进行并联的方法,具有电缆应用数量多、传输电流大、配套设备多及损耗严重等缺点。本方案提出一种光伏发电系统串联式中高压方阵解决方案,利用光伏组串高压隔离功率调节模块具有的最大功率点跟踪MPPT、DC/DC、安全监控、高压隔离(隔离电压>Uxmax)等特点,将若干光伏组串进行高压隔离,再通过组串之间再串联实现串联式高压光伏方阵,该方案摒弃汇流设备及升压变压器,可提高逆变、直流设备输入电压,减小传输电流,增大发电功率,降低传输损耗及设备故障率,同时满足不同功率光伏组串功率的再串联,实现光伏直流高压传输的目的。
This article explores a series-connected high-voltage photovoltaic block and system strategy, in order to deal with the problem, that the number of PV modules in series-connected is limited because of the withstand voltage of PV modules is no more than 1000 V. With the aim to increase the generating capacity, the traditional strategy is using convergence devices to parallel the PV strings, which results in high currents, cable waste, power loss and high investment. This article presents a relatively high-voltage tandem photovoltaic block system strategy, which using the technique of maximum power point tracking（MPPT）, DC/DC, security monitoring, power-adjusting high-voltage isolation component（isolation voltage Uxmax）, to isolate numbers of PV stringswith high-voltage. So that, the aims of increasing the input voltage of inverter and other DC devices, increasing the generating capacity, reducing the current and power loss, even reducing the rate of equipment failure, will be achieved. Furthermore, it also could cancel the convergence devices while power-adjusting the requirements of PV strings with different capacity, making PV transmitting current in high-voltage.
出处
《电气技术》
2015年第2期137-144,共8页
Electrical Engineering
基金
国家863课题"百兆瓦级光伏系统设计集成技术研究及关键设备研制"(2011AA05A303)
关键词
光伏组串高压隔离功率调节模块
组串之间再串联
串联式高压光伏方阵
power-adjusting high-voltage isolation component of PV string
series-connected PV strings
series-connected high-voltage photovoltaic block
withstand voltage of PV string
