含多端柔性互联装置的交直流混合配电网协调控制方法

含柔性互联装置的交直流混合配电网协调控制方法是保证其高效可靠运行需要解决的关键技术之一。文中提出了一种新型的交直流混合配电网的协调控制方法。首先,根据互联装置交流侧运行状态将系统分为了9种不同的运行模式,并依照不同运行模式的控制需求提出了互联装置、储能单元以及光伏发电单元的控制策略。针对下垂控制的直流电压偏差问题,采用直流电压二层控制进行补偿。同时为了避免深度放电,提出了基于荷电状态带有缓冲区的减载算法,能够有效减小直流电压波动,而对于深度充电问题,提出了采用光伏发电单元同时切换至分层直流下垂控制实现直流电压恒定,实现按照容量比例进行均分。最后,通过仿真软件搭建了仿真模型,仿真结果验证了所提出方法的有效性和可行性。

Coordinated Control Method of AC/DC Hybrid Distribution Network with Multi-terminal Flexible Interconnection Devices

The coordinated control method of AC/DC hybrid distribution network with flexible interconnection devices is one of the key technologies to ensure the high efficiency and reliable operation. A novel coordinated control method is proposed for AC/DC hybrid power network. First, nine different operation modes are divided according to the operation states at AC side of flexible interconnection devices, and the control strategy for interconnection devices, storage units, and photovoltaic power generation units is proposed depending on control requirements of different operation modes. In order to solve the deviation problem of DC voltage, the two-layer control of DC voltage is applied to compensate. At the same time, in order to avoid deep discharge, the load shedding algorithm based on the state of charge with buffer is proposed, which can effectively reduce the fluctuation of DC voltage, and for avoid deep charging, the photovoltaic power generation units are simultaneously converted into hierarchical DC droop control to keep DC voltage constant and achieve power sharing depending on capacity proportion. Finally, the simulation model is built by simulation software, and the simulation results show the effectiveness and feasibility of the proposed method.