直流微网自适应动态下垂控制策略研究

直流微网由于接入分布式能源而具有随机性和不稳定性,为平衡负荷波动,传统直流微网常采用下垂控制策略,但会引起一定范围内的电压偏移,不仅影响系统调节范围,而且会对接入负载产生不良影响。此外,传统下垂控制系数为常数,下垂系数大则电压会远远偏离参考值,下垂系数小则动态性能差。针对以上问题,提出直流微网自适应动态下垂控制策略,不仅具有良好的动态性能而且实现系统电压无静差。将上述控制策略分别进行仿真和实验,结果表明该控制策略可有效实现直流微网的运行稳定。

Research on Adaptive Dynamic Droop Control Strategy for DC Microgrid

Due to the access to distributed energy, DC microgrids are random and unstable. To balance load fluctuations, the traditional DC microgrids often adopt the droop control strategy. This will cause a certain range of voltage offset, which not only affects the system adjustment range but also has an adverse impact on the access of load. In addition, the traditional droop control coefficient is constant:if this coefficient is large, then the voltage will be far from the reference value; otherwise, the dynamic performance will be poor. In view of the above problems, an adaptive dynamic droop control strategy for DC microgrid is proposed in this paper, which not only has good dynamic performance but also achieves system voltage without static error. Simulations and experiments were conducted under the proposed control strategy, and results show that this strategy can effectively achieve the stable operation of DC microgrid.