城市综合交通供电系统的协调控制策略

Coordinated Control Strategy for Power Supply System of Urban Comprehensive Transportation

电气化轨道交通车辆和电动汽车将是未来城市电网负荷的重要组成部分,其供电系统安全运行的意义重大。根据牵引供电系统和电动汽车充电的特点,同时考虑可再生能源的有效利用,提出了基于直流微电网的城市综合交通供电系统,描述了系统的基本组成和拓扑结构。为了保证系统各单元的稳定运行,提出了基于DBS和低带宽通信的协调控制策略,将系统运行划分为4种工作模式,并通过电压信号同步预处理环节对各模式间的切换信号进行了优化;同时利用各单元的信息交换能力,提出了基于自适应虚拟阻抗的改进下垂控制,实现了分布式电源间的功率均分。仿真结果表明,该控制策略可以维持直流母线电压的稳定,实现系统的功率平衡,为城市综合交通供电系统的运行提供支撑。

Electrification railway vehicles and electric vehicles will be an important part of the future urban power grid load, which has a great significance for safe operation of the power supply system. According to the characteristics of the traction power supply system and electric vehicle charging, an urban comprehensive traffic power supply system is proposed based on the DC microgrid, and the basic composition and topology structure of the system are described, in which the effective use of renewable energy is taken into account. In order to ensure the stable operation of the system, a coordinated control strategy based on DC bus signaling（DBS） and low-bandwidth communication is proposed. The system is divided into four working modes and the switching signal of each mode is optimized through the synchronous pretreatmeat link of the voltage signal. Based on the information exchange capability of each unit, an improved droop control method based on adaptive virtual impedance is proposed, which realizes the power sharing between distributed generations. The simulation results show that the control strategy can maintain the stability of the DC bus voltage and achieve the power balance of the system, which provides support for the operation of the urban comprehensive traffic power supply system.