基于等微增率准则的微电网分布式经济调度方法

Distributed economic dispatch method for microgrids based on the equal incremental cost criterion

针对微电网运行成本最小化问题,提出一种微电网的双层经济调度模型,其中上层是进行信息传输的通信网络层,下层为进行电力传输的微电网层。通信网络包含两个子网络,其中第一个网络包含所有agent,第二个网络只包含可控agent。随后建立通信网络的构建规则,系统性地给出从任意通信网络导出分布式控制律的一般方法。从第一个子网络中推导出的分布式控制律能够保证系统的功率平衡,而从第二个子网络中推导出的控制律能够实现系统内可控分布式电源(distributed generation,DG)的发电成本最小化。通过第二个子网络的可控agent的反复迭代,达到增量成本一致,根据等微增率准则,实现所有可控DG的运行成本最小化。最后,设计两个仿真算例,对所提控制律进行测试。仿真结果表明,在可再生能源和负载需求剧烈波动的情况下,提出的方法均能实现微电网的运行成本最小化。

To achieve the minimal operation cost of microgrids (MGs),a distributed economic dispatch method was proposed,in which a two-layer model was used.The upper layer is a communication network for information transmission,while the lower layer is a MG for power transmission.The communication network consists of two sub-networks,one of which is composed of all agents while the other is only composed of controllable agents.Then construction rules of communication network was established,and a general method was systematically given to derive distributed control laws from any communicationnetworks.The distributed control laws derived from the first sub-network ensure the supply-demand balance,while the distributed control laws derived from the second sub-network minimize the cost of power generation,thus realizing the consensus of incremental cost of all the controllable DGs via the iteration of controllable agents.Based on equal incremental principle,the minimal operation cost of all controllable DGs was obtained.Finally,two simulation cases were designed to evaluate the performance of the method.The simulation results show that the proposed method can realize the minimal operation cost of MGs when the loads and renewable resources fluctuate widely.