用于提高可再生能源发电系统电压稳定性的双向DC/AC/DC变换器研究

由于可再生能源具有随机性特点,使得可再生能源发电系统电压稳定性较差。设计了一种基于超级电容器储能系统的大功率、宽工作范围双向DC/AC/DC变换电路,对变换电路进行了原理分析,建立了数学模型,根据可再生能源发电系统直流母线电压的不同运行状态,设计了控制策略,通过控制能量在超级电容器与可再生能源发电系统之间相互传递,提高可再生能源发电系统的电压稳定性。通过仿真分析,验证了设计电路的正确性、控制策略的有效性和运行的灵活性。

Research on the control of voltage stability in renewable energy system based on bi- directional high power DC/AC/DC converter

The utilization of renewable sources of energy,which makes the voltage of renewable energy generation system unstable,is random.The approach presented in this paper makes full use of a novel dual-directional high-power DC/AC/DC converter based on super capacitor storage system to improve the voltage stability of renewable energy generation system.Firstly,the principle of main circuit of the converter is analyzed.Meanwhile the mathematical model is established. According to the different operating mode,the control strategy is put forward. The transfer of energy between super capacitor array and the renewable energy generation system can be accomplished in order to enhance the voltage stability.At last,the process is simulated by MATLAB/Simulink.It is verified that the dual-directional DC/AC/DC converter circuit designed is of correctness and the control strategy is of high validity and operation flexibility.