直流微网中混合储能系统的无互联通信网络功率分配策略

发布时间：2018-07-06 09:28

本文选题：混合储能系统 + 直流微网　；参考：《电工技术学报》2017年10期

【摘要】：直流微网中通常采用混合储能系统作为缓冲环节,对分布式能源和负载引起的不同时间尺度功率波动进行补偿。为实现功率在能量密度型储能元件和功率密度型储能元件之间合理分配,提出无互联通信网络的分层控制策略。其中,底层控制以电压变化率作为虚构的信息载体,通过设置不同储能接口变换器输出电压关于功率的"灵敏度",确保超级电容在负载突变瞬间能够提供大部分功率;二次控制对底层控制产生的稳态误差进行补偿,以实现输出电压稳定,并保证超级电容稳态电流为零。在此控制框架下,各储能单元仅需本地信号即可实现自主协调运行,避免了互联通信网络所带来的经济性和可靠性问题。最后,实验结果验证所提方法的可行性和有效性。
[Abstract]:In DC microgrids, hybrid energy storage systems are usually used as buffers to compensate for the different time-scale power fluctuations caused by distributed energy sources and loads. In order to realize the reasonable distribution of power between the energy density type energy storage element and the power density type energy storage element, a hierarchical control strategy for the communication network without interconnection is proposed. Among them, the bottom control takes the voltage change rate as the fictitious information carrier, by setting the "sensitivity" of the output voltage about the power of the converter with different energy storage interface, to ensure that the super capacitor can provide most of the power at the moment of the sudden change of load. The secondary control compensates the steady-state error caused by the underlying control to realize the output voltage stability and to ensure that the steady-state current of the supercapacitor is zero. Under this control framework, the energy storage units can operate independently and harmoniously only with local signals, thus avoiding the problems of economy and reliability brought by the interconnected communication network. Finally, the experimental results verify the feasibility and effectiveness of the proposed method.
【作者单位】：北京交通大学国家能源主动配电网技术研发中心;北京电动车辆协同创新中心;丹麦技术大学电气工程学院;
【基金】：国家电网公司科技项目资助(DG71-16-008)
【分类号】：TM53;TM727;TM912

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