光伏用FIBC变换器稳定分析与谐振抑制方法

Stability Analysis and Resonance Suppression Method with FIBC Converter System for PV Application

针对光伏发电系统输出电压低、功率不稳定、电压波动等电能质量问题,提出了一种二阶低通滤波器和高增益FIBC变换器的组合结构。为了解决滤波器和变换器级联可能造成的谐振现象,设计了一种可有效抑制谐振发生的稳定器,能够在不增加系统体积重量和功率损耗的前提下,抑制系统的振荡和波形畸变。首先建立了系统的数学模型,并利用Lyapunov第一法对系统的稳定性能进行分析,证明了该方法的可行性。仿真结果验证了所提控制策略和拓扑结构的正确性和有效性。

In order to solve the power quality problems, such as low voltage output, power instability and voltage fluctuation. A combined structure of two order low-pass filter and high gain FIBC converter is presented. By way of disposing the resonance phenomenon caused by the cascade of filter and converter, this paper designs a kind of sta- bilizer which can restrain the resonance effectively. It can suppress the oscillation and distortion of the system with- out increasing the volume weight and power loss of the system. Firstly, the mathematical model of the system is es- tablished. Then, the stability of the system is analyzed is proved. The simulation results verify the correctness gY- by using Lyapunov method, and the feasibility of the method and effectiveness of the proposed control strategy and topology.