微网电压跌落补偿平滑过渡复合控制的相图分析

Voltage Sag Compensation Based on Phase Diagram Analysis of Compound Control with Smooth Transition for Micro-grid

为提高微网电压补偿效果,增强电压控制的稳定性,并且降低补偿功耗,提出微网电压跌落补偿平滑过渡复合控制的相图分析策略。首先,给出低压小型微网模型,以及3种基本的补偿策略相量图,并分析其特点及存在不足;其次,根据微网电压控制特点,选取预跌落补偿和最小能量补偿方式,同时为实现两种策略的平稳过渡,基于二次函数曲线模型,针对敏感负载的相位跳变设计了平滑过渡过程;最后,通过在Matlab和JAVA代理开发框架系统构建微网仿真模型,实验结果表明,所提方法可有效地减小并网冲击电流对直流母线电压的影响。

In order to improve the voltage compensation effect, enhance the stability of voltage control, and reduce the compensation power consumption, the voltage sag compensation based on the phase diagram anal- ysis of compound control with smooth transition is proposed. Firstly, the small low voltage micro-grid model and three basic compensation strategy were presented, then its characteristics and existing problems were an- alyzed; Secondly, according to the characteristics of micro grid voltage control, here selected the pre sag compensation and minimum energy compensation, at the same time to achieve the two strategies of smooth transition, the quadratic function curve model was used to design the smooth transition process for sensitive load jump; Finally, the simulation model was constructed by using Matlab and JADE system, the experimen- tal results show that the proposed method can effectively reduce the impact of grid impulse current on the DC bus voltage.