Abstract
In Communication-Based Train Control (CBTC) systems, random transmission delays and packet drops are inevitable in the wireless networks, which could result in unnecessary traction, brakes or even emergency brakes of trains, losses of line capacity and passenger dissatisfaction. This paper applies predictive function control technology with a mixed H2 /∞ control approach to improve the control performances. The controller is in the state feedback form and satisfies the requirement of quadratic input and state constraints. A linear matrix inequality (LMI) approach is developed to solve the control problem. The proposed method attenuates disturbances by incorporating H2 /∞ into the control scheme. The control command from the automatic train operation (ATO) is included in the reward function to optimize the train's running profile. The influence of transmission delays and packet drops is alleviated through improving the performances of the controller. Simulation results show that the method is effective to improve the performances and robustness of CBTC systems.
Highlights
In 1964 the first high‐speed train started operating in Japan [1]
A communication‐based train control (CBTC) system consists of automatic train supervision (ATS), automatic train operation (ATO), automatic train protection (ATP), zone controller (ZC), data communication system (DCS), database storage unit (DSU) and computer interlocking (CI)
We propose a predictive function control (PFC) scheme based on a mixed H2 / H control algorithm to improve the performances and robustness of CBTC systems
Summary
In 1964 the first high‐speed train started operating in Japan [1]. Since this type of rail system has made great progress mainly in Japan, France, Germany, Italy, Britain, and lately in China. PFC avoids high dimensional matrix computations and inversions, which can reduce the computational time [38], and this is especially important for a fast dynamic system. The robustness in PFC controllers is important for time varying dynamical systems such as CBTC systems. A CBTC system is an automatic train control system using bidirectional train‐ground communications to transmit train status and control commands to ensure the safe operation of trains. We need to develop control algorithms to improve the system performances under transmission delays and packet drops. We propose a PFC scheme based on a mixed H2 / H control algorithm to improve the performances and robustness of CBTC systems.
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