光伏发电并网对配电网保护的影响及对策

Effects of Grid-Connected Photovoltaic System on Distribution Network Protection and Its Countermeasures

随着能源和环境问题越来越突出,光伏发电作为一种战略性新兴产业,得到了快速发展。由于光伏发电的成本不断降低,并网型光伏系统逐步成为光伏产业的主流。为了保证电网安全稳定运行,本文分析了光伏电源并网对配电网原有的电流保护和自动重合闸装置所造成的影响。通过PSCAD仿真验证了不同容量的光伏系统并网对线路故障电流的影响。为了减少甚至消除这些不利影响,提出了以广域测量系统为基础的保护方案以及相关的改进措施。

With the energy sources and environmental problems becoming increasingly serious, photovoltaic power generation as a strategic new industry, has been rapid development. As the cost of photovoltaic power generation is reduced, grid-connected photovoltaic system has gradually become the mainstream of photo- voltaic industry. To ensure grid security and stability, the effects of grid-connected photovoltaic system on the traditional current protection and automatic reclosing device are analyed in this paper. The results of the PSCAD simulation prove that the different capacity of grid-connected photovoltaic systems affect the line fault current.The protection scheme with the wide-area measurement system for basic and the relevant im- provements are put forward to reduce or even eliminate these adverse effects.