基于可变速率LPPT的下垂控制的微电网光伏系统的运行频率控制  

The Operating Frequency Control of Micro Network Photovoltaic System of Drooped Control Based on Variable Rate LPPT

作　　者：唐宇 TANG Yu(Electrical Engineering College of Guangxi University,Nanning 530004,China)

机构地区：[1]广西大学电气工程学院

出　　处：《电气开关》2019年第6期53-56,60,共5页Electric Switchgear

摘　　要：本文的目的是改善光伏(PV)系统组成的孤岛微电网系统的频率调节。光伏系统运行在有限功率点跟踪(LPPT)模式下使光伏系统的有功功率应用下垂控制,反过来改善了微电网频率的调节。LPPT是用于从光伏系统获得可能比最大功率小的期望功率值的控制技术。可变速率LPPT是可用的LPPT控制中的最好控制技术,在工程中使用的技术。本文中使用的下垂控制器为基于母线频率与标称值(50Hz)的偏差的光伏系统运行在有限功率处提供指定的参考功率设定值。提出了一个案例研究来验证该方法的有效性。The objective of this paper is to improve the frequency regulation of an islanded microgrid system consisting of non-battery-backed photovoltaic(PV)systems.Operating the PV system in limited power point tracking(LPPT)mode gives provision for the application of droop control on the PV system active power,which in turn enhances the frequency regulation of the microgrid.The LPPT is a control technique used for extracting the desired amount of power that may be less than the maximum available power from the PV system.Variable rate LPPT is the superior control technique among the available LPPT control techniques,which is employed in the work.The droop controller implemented in this paper provides the required power reference command for the limited power operation of a PV system based on the deviation of bus frequency from its nominal value(50 Hz).A case study is presented to validate the effectiveness of theabove-mentioned concept.

关 键 词：下垂控制 孤岛模式 有限功率追踪 最大功率追踪 微电网 光伏系统 可变速率LPPT 

分 类 号：TM71[电气工程—电力系统及自动化]