Distributed Reactive Power Sharing Control for Microgrids With Event-Triggered Communication
Distributed Reactive Power Sharing Control for Microgrids With Event-Triggered Communication
复制标题
DOI：
10.1109/tcst.2016.2552982
复制
发表时间：
2017-01-01
影响因子：
4.8
通讯作者：
Egerstedt, Magnus
中科院分区：
文献类型：
--
作者：
Fan, Yuan;Hu, Guoqiang;Egerstedt, Magnus
由于微电网固有的分布式和异构性，与集中控制策略相比，分布式控制是提高微电网稳定性、可靠性和可扩展性的有前途的方法。本文研究了连接交流逆变器的微电网的分布式无功功率共享问题。在母线角度差的标准解耦近似下，每个逆变器的无功功率流取决于通过电力线连接的其相邻逆变器的电压幅度。利用李亚普诺夫方法，提出了一种具有非线性状态反馈的新型分布式电压控制器，用于微电网的无功功率共享。事实证明，如果连接逆变器的通信网络，则在所提出的控制器下，逆变器可以实现精确的无功功率共享。然后，通过引入采样和保持方案，我们将所提出的控制器扩展到逆变器之间具有事件触发通信的非线性状态反馈控制。新的事件触发控制方法可以大幅减少微电网的通信量，并显着放宽逆变器之间精确实时信息传输的要求。所提出的两种控制器均通过对一组具有时变负载的逆变器进行仿真来验证。
Due to the inherently distributed and heterogeneous nature of the microgrids, distributed control can be a promising approach to improve the stability, reliability, and scalability of the microgrids compared with centralized control strategies. This paper studies the distributed reactive power sharing problem for a microgrid with connected ac inverters. Under the standard decoupling approximation for bus angle differences, the reactive power flow of each inverter is dependent on the voltage amplitudes of its neighboring inverters connected by electrical power lines. Using the Lyapunov approach, a novel distributed voltage controller with nonlinear state feedback is proposed for reactive power sharing of the microgrid. It is proved that the inverters can achieve accurate reactive power sharing under the proposed controller if the communication network of inverters is connected. Then, by introducing the sampling and holding scheme, we extend the proposed controller to the nonlinear state feedback control with event-triggered communication among inverters. The new event-triggered control approach can dramatically reduce the amount of communication of the microgrid, and significantly relax the requirement for precise real-time information transmission among the inverters. Both the proposed controllers are validated by simulations on a group of inverters with time-varying loads.