含分布式电源的配网自适应距离保护方案

An Adaptive Distance Protection Scheme for Distribution System with Distributed Generation

由于分布式电源输出功率的随机性,设定整定值的传统距离保护对于含有分布式电源的配电网的保护变得非常困难。提出了一种新的自适应距离保护方案来解决这个问题。首先,基于分布式电源的连接点,保护装置被划分到不同的保护区,在分布式电源上游侧配置有自适应距离保护。然后,根据含有分布式电源的配电网在故障发生时的特征进行分析,利用自适应距离保护方案来解决这个问题。结果表明,该方案能够依据运行方式和分布式电源的输出容量自动计算出整定值,且无需相互通信。与传统的自适应保护方案相比,该方法的性能大大提高。基于10 kV配电网的仿真计算,验证了该方案的有效性。

The value setting of the traditional distance protection has become very difficult for the distribution system with distributed generators （DGs） owing to the randomness of the DG output power. This paper proposes a new adap tive distance protection scheme to solve this problem. Firstly, on the basis of the connected point of DGs, the protected feeders are divided into different zones, with adaptive distance protection configured at the upstream side of DG. Then, based on a fault characteristic analysis of the distribution system with DG, the adaptive distance protection scheme for the distr/bution system with DG is studied to solve this problem. The results show that this scheme can automatically calculate the settings according to the operation mode and the output power of DG with no need for communication. Compared with the traditional adaptive protection scheme, the performance of this method is great ly improved. Simulation results on a 10 kV distribution system have verified the validity of the scheme proposed.