基于一致性改进下垂控制的微电网频率研究

Research on Micro-grid Frequency underConsistency-based Improved Droop Control

针对传统下垂控制在调节交流微电网频率稳定性时出现频率波动过大、调频死区的问题,提出一种基于一致性改进下垂控制的分层控制策略应用于含有多储能装置的交流微电网系统中,并构建含柴油发电机混合发电系统与孤网微电网互动的新模型。在此基础上,对微电网调节频率进行建模,通过所提出的分层控制对混合发电系统进行有功功率响应微电网需求,实现了稳定频率的目的。最后进行MATLAB/Simulink算例仿真。结果表明,所提出的一致性改进下垂控制的分层控制策略解决了分布式电源功率分配失衡问题,改善了微电网的频率质量。

As excessive frequency fluctuation and frequency modulation dead-zone appear when AC micro-grid frequency stability is adjusted through traditional droop control,a hierarchical control strategy based on consistency-based improved droop control was proposed for AC micro-grid systems containing multiple energy storage devices,and a new model of interaction between the hybrid generation system using diesel generators and isolated micro-grid was built up.On this basis,modeling was completed for the micro-grid adjustment frequency,and the active power of the hybrid generation system was responded to the demand of the micro-grid through the proposed hierarchical control,thus achieving the purpose of frequency stabilization.Finally,MATLAB/Simulink simulation results indicated that the proposed hierarchical control strategy of consistency-based improved droop control solved the problem of unbalanced power distribution of distributed generation and improved micro-grid frequency quality.