交直流混合配电网控制保护技术研究与应用

Research and Application of Control and Protection Technology for AC-DC Hybrid Distribution Network

交直流混合配电网系统复杂、电力电子设备众多。一方面,其灵活快速的控制能力为用户带来了智能、高效、高质量的供电服务;另一方面,其多时间尺度、低过电流耐受力的特性对配电系统的故障应对能力提出了更严苛的要求。为此,首先从保护、故障穿越以及谐振抑制3个方面开展交直流混合配电网暂态控制技术研究;其次从2种不同应用场景的混合配电网拓扑入手,研究交直流混合配电网系统控制架构、协调控制与能量管理技术;最后以2个典型的交直流混合配电网示范工程为例,介绍交直流混合配电网控制保护技术的应用,并结合实践效果对直流配用电系统未来研究的重点方向进行展望。

The topology of AC-DC hybrid distribution network system is complex and there are large numbers of power electronic devices.On one hand,the flexible and fast control ability of the system brings intelligent,efficient and high-quality power supply service for users.While on the other hand,the characteristics such as multiple time-scale and low over-current tolerance put forward more stringent requirements for the fault response ability of the distribution system.Therefore,this paper firstly studies the transient control technology of AC-DC hybrid distribution network in three aspects of protection,fault ride-through and resonance suppression.Secondly,starting from the topology of the hybrid distribution network in two different application scenarios,it studies the control architecture,coordinated control and energy management technologies of the AC-DC hybrid distribution network.Finally,it takes two typical application demonstration projects as examples,introducing the control and protection technologies,and expects the key direction of future research on the DC distribution system.