A Control Method for Compensating Communication Delays in Load Frequency Control with Electric Vehicle Aggregators

摘要

Due to the intermittent generation of renewable energy sources, large integration of renewable energy sources tends to cause frequency stability problems in power systems. The utilization of electric vehicles (EVs) is considered to be one of the most prospective solution in frequency regulation especially in load frequency control (LFC) domain because of the fast-response characteristics of the EV batteries. However, the EV aggregators (EVA) participating in LFC regulation market may suffer from communication delays caused by the open communication infrastructure. In this paper, a control method is designed to compensate the communication delays for EVAs in order to improve the performance of frequency regulation capability of EVs. In a power system which applies Flat Frequency Control (FFC), the proposed method estimates the relationship between the LFC control signal and the frequency deviation in the system from historical data and control the EVs directly through the real-time frequency deviation. The implementation cost is small, and EVAs are expected to be more competitive in the frequency regulation market. The performance improvement is tested by dynamics simulation on ACG30 model in Simulink and evaluated based on a performance score. The performance score of EVA increased significantly in the simulation, and the system frequency fluctuation can also be reduced by applying the proposed control method.