智能电网中分布式光伏逆变器的基本功能组件(英文)

Building Blocks of Distributed Photovoltaic Inverters in Smart Grid

智能电网环境中,光伏系统作为分布式发电机应用时,必须满足并网标准的各种要求。逆变器作为光伏阵列与电网的连接机构,应该具备分布式发电机入网的必要功能。文章重点介绍了光伏逆变器的必要功能组件,提出光伏逆变器的基本功能算法,包括基于空间矢量脉宽调制的电流控制算法、基于黄金分割搜索的最大功率跟踪算法、加速式自动移相孤岛检测算法等。这些新技术构成并网型光伏逆变器的一个完整技术方案。随着智能电网的发展,更多分布式发电装置将在虚拟电站的控制环境中运行。为此,探讨了光伏逆变器的通讯和电力系统控制功能。这些附加功能使光伏系统能够参与电力系统的调度和服务,从而创造更高的经济价值。

This paper focused on functions and associated building blocks of photovoltaic （PV） inverters as distributed generators （DGs） in a smart grid environment. As DGs, PV systems must meet grid-interconnection requirements. Thus, PV inverters, as the interface between PV modules and electrical grids, must have the required grid-integration functions of DGs. The authors had proposed and developed the technologies for these building blocks, including a space-vector pulse-width-modulation based current controller targeting low harmonic distortions;a maximum power point tracking strategy based on golden section search;and a new islanding detection method based on accelerated automatic phase shift. These developed building blocks had been integrated as a complete solution of PV power converters for power system operation.This paper also discussed communication and system control functions of PV DG inverters, which were managed in a virtual power plant environment. The advanced functions as integrated in inverters allow PV systems to participate in power system operation and services, and thus offer additional values of PV systems to power systems.