基于磁集成变压器的光伏电站直流并网

针对光伏电站直流并网系统中存在的升压比较低,各光伏单元输出变化时复杂的功率控制和电压平衡问题,提出了一种基于磁集成变压器(Magnetic Integrated Transformer,MIT)的光伏电站直流并网拓扑方案。首先给出系统拓扑结构、设计了MIT参数和功率控制策略,通过Boost电路和磁集成变压器的双重升压,使光伏电站能够输出高压直流,并实现电压和功率的灵活控制。然后建立了系统数学模型,在稳态和暂态下进行了仿真分析。仿真结果验证了所提出并网方案和控制策略的可行性和有效性。

Research on DC grid Connection of Photovoltaic Power Plant based on Magnetic Integrated Transformer

To solve the problems of the lower voltage boosting ratio in the DC grid-connected system of photovoltaic power plants and the complex power control and voltage balance when outputs of photovoltaic unit are changed, a novel DC grid-connected topology for photovoltaic based on magnetic integrated transformer (MIT) was proposed in this paper. Firstly, the topology of the system, parameters of the designed MIT and strategy of power control are presented in order to generate high DC voltage by using both boost circuits and MIT, and to achieve flexible power control. Then mathematical model of the system was established and simulated under steady and transient state. Finally the feasibility and effectiveness of grid-connected methodology and control strategies are verified by simulation results.