一种独立光伏发电系统双向变换器的控制策略

Control Strategy for Bi-Directional DC/DC Converter of a Novel Stand-Alone Photovoltaic Power System

提出一种太阳能独立光伏发电系统。与传统的独立光伏发电系统相比,新系统具有对蓄电池的充放电进行有效控制、保护蓄电池不受损坏、延长蓄电池的使用寿命、充分利用太阳能、实现系统的能量管理等特点。由于双向变换器在该系统中承担了双向输送能量的任务,因此实现系统能量管理的核心是对双向变换器的合理有效控制。通过系统的能流模型分析了其运行原理,详细给出系统双向变换器的双向选通控制策略和延时同步整流控制策略。最后通过一个500W的原理样机验证了理论分析的正确性和控制策略的有效性。

A novel stand-alone photovoltaic power system is proposed in this paper. Compared with the traditional one, this system can control the battery charge or discharge effectively, protect battery and prolong its natural life. It can make use of solar energy significantly and achieve energy management for the proposed system etc. Bi-directional converter implements bi-directional energy transfer in the system, so the core of energy management is effective control bi-directional converter. The operation principle is also illustrated by the energy flow model of stand-alone photovoltaic power system, which implements bi-directional on/off selection control strategy and delay synchronizing rectifier control strategy of the bi-directional converter in detail. A 500W prototype converter is built to verify the theoretical analysis and the effectiveness of the control strategy.