多母线微电网电压不平衡分层分区优化控制

Hierarchical and zonal optimizing control of voltage unbalance of multi-bus microgrid of power

在含多母线的孤岛微电网中,不同的区域和母线对电能质量的要求各不相同.为满足各母线对电能质量多样化的需求,需对多母线孤岛微电网电压质量进行分区控制.针对此问题,在电压不平衡补偿机理分析的基础上,提出一种电压不平衡分层分区优化补偿策略.该分层分区控制结构包括三层,其中,二次控制层主要生成电压不平衡补偿参考量(UCR),作为分布式电源(DG)的补偿依据,实现公共耦合点(PCC)的电压不平衡补偿;三次控制层,采用人工蜂群算法(ABC)获得最优的三次补偿增益,以此调节DG输出功率参考值,使各DG补偿量按容量比例分配,实现电压质量分层分区优化控制.仿真结果验证了所提策略的有效性和可行性.

There are different voltage quality requirements at different zones and buses of multi-bus microgrids on isolated island.In order to meet the needs of variety of power quality presented by each bus,a zonal control of voltage quality of multi-bus islanded microgrid should be carried out.Aimed at this problem,a hierarchical and zonal optimizing control strategy is proposed based on the analysis of compensation mechanism of voltage unbalance in multi-bus islanded microgrid.This hierarchical and zonal control configuration includes three levels and among them in the secondary control level,an unbalance compensation reference(UCR)is generated as the compensation basis of distributed generator(DG)to achieve voltage unbalance compensation at the public coupling point.In the tertiary control level,the artificial bee colony(ABC)algorithm is used to obtain the optimal tertiary compensation gain(TCG i),so that the DG output power reference value is adjusted to make each DG compensation amount distributed according to the proportion of its capacity and realize hierarchical and zonal optimizing control of voltage quality.It is verified by simulation result that the compensation policy proposed will be effective and feasible.