基于自适应经济下垂控制的微电网分布式经济控制

Distributed economic control of microgrid based on adaptive economic droop control

在孤岛微电网中,传统下垂控制按分布式能源的容量比分配有功功率,容易使微电网的整体运行成本偏高。为有效降低系统运行成本,依据等微增率准则提出一种基于边际成本的经济下垂控制框架,在该框架下分布式能源能够按照等边际成本出力。考虑到分布式能源的最大出力限制,提出基于一致性的分布式自适应控制器,将功率稳定在最大值,从而退出边际成本一致性。提出一种分布式二次频率控制器有效恢复孤岛微电网的频率。仿真结果证明了所提控制器的有效性以及抗通信失败的性能。

In island microgrid,the traditional droop control allocates active power according to the capacity ratio of distributed energy,which may easily cause high overall operation cost of microgrid.In order to effectively reduce the system operation cost,an economic droop control framework based on the marginal cost is proposed according to the equal incremental criterion,in which the outputs of distributed energies are corresponding to the equal marginal costs.Considering the maximum output limitation of distributed energy,the distributed adaptive controller based on the consistency is proposed to stabilize the power at the maximum value to exit the marginal cost consistency.A distributed secondary frequency controller is proposed to effectively recover the frequency of island microgrid.Simulative results verify the effectiveness of the proposed controller and the performance against communication failures.