海岛光储直流微电网自治控制策略

Autonomous Control Strategy of Island DC Microgrid With Photovoltaic and Storage System

针对海岛光储直流微电网系统,设计了一种基于电压幅值的控制策略。以直流母线电压幅值为判定基准,将控制策略设置成不同模式。利用直流母线电压变化量作为系统模式的切换基准,无需控制器间进行通信连接,提高了系统的自治性、可靠性与经济性。在不同模式中合理调节变流器的工作方式,维持直流母线电压恒定,实现能量最优利用和系统稳定工作。针对海岛淡水短缺问题,设计了可控海水淡化负荷的投切控制,在改善海岛内的淡水供应的同时,辅助系统功率调节。实验结果实现了工作模式的平滑切换,验证了提出方法的有效性和正确性。

An autonomous control is proposed for DC island microgrid with photovoltaic generation and storage system based on the DC bus voltage control. The operation of system is categorized into several different modes by monitoring the amplitude of DC bus voltage. The DC bus voltage amplitude is employed as an information carrier to determine the operation mode switching. Hence, each controller operates independently without communicating each other. Each power electronic converter coordinates its control method to maintain the constant of DC bus voltage under different modes. A control strategy for desalination plant in the system is proposed, which will be switched on when the power is excess and switched off when the power is shortage. Experimental results show that this control strategy realizes the smooth transition between the different modes, which verifies the practical feasibility and effectiveness of the proposed control strategy.