考虑通信延时的分布式发电系统协同控制策略

Cooperative Control Strategy of Distributed Generation System Considering Communication Delays

分布式控制是提高分布式发电系统运行灵活性和可靠性的重要技术手段,但其控制效果较依赖于各分布式电源之间快速、可靠的信息交互。实际系统中,通信延时往往难以避免,其存在可能使控制性能恶化,甚至导致系统失稳。为此,提出一种考虑通信延时的分布式发电系统高可靠协同控制策略。首先,分析通信延时对常规分布式控制系统的影响;其次,通过引入Artstein变换,将含延时系统的稳定性问题转换为无延时系统的控制器优化设计问题;在此基础上,针对延时导致系统响应性能恶化的问题,设计有限时间控制策略,在优化收敛速度的同时提升系统对设备频繁投切的适应性。多种工况的结果验证了控制策略在通信延时下具有更可靠的控制性能。

Distributed consensus-based control is an important technical method to improve the flexibility and reliability of distributed generation system's operation;however,the control highly depends on the fast and reliable communication between distributed generators.In the practical system,the communication time delay is inevitable and will significantly affect the control performance and the stability of the system.Therefore,a highly reliable cooperative control strategy of distributed generation system considering communication time delays is proposed in this paper.Firstly,the influence of communication time delays on the conventional distributed control system is analyzed.Secondly,by introducing the Artstein transform,the stability problem of system with delay is transformed into the controller optimization design problem of system without delay.Moreover,in accordance with the problem that time delay will seriously affect the response performance of the system,a finite-time control strategy is designed,improving the convergence speed and the adaptability of the system under the frequent switching of equipment.The more reliable control performance of the control strategy under communication delay is verified by the results of various conditions.