大型火电机组增容对电网暂态稳定特性影响研究

Impact of Large Thermal Power Units' Capacity Increase on Transient Stability Characteristics of Power Grid

为节能减排、降低发电成本,对大型火电机组进行增容,需研究增容对电网暂态稳定特性的影响。通过理论推导和仿真分析研究了大型火电机组增容后对电网暂态稳定特性的影响,理论推导结果表明,当发电机有功出力增加时,发电机的暂态稳定特性变差。仿真结果表明,在大负荷区内机组全开方式下,增容后钢一光-鄂电网暂态稳定特性变差,抑制发电机出力时,暂态稳定特性能得到一定程度改善。理论推导和仿真分析结果可相互验证,大型火电机组增容后钢-光-鄂电网暂态稳定特性恶化。

In order to achieve energy saving, emission reduction and power generation cost reduction, the capacity of large thermal power unit has been increased, it is necessary to study the impact of capacity increase on the transient stability characteristics through the theoretical derivation and the simulation of transient stability characteristics. The results of theoretical derivation show that when the active power of generator increases, the transient stability characteristics of generator deteriorate. The results of simulations indicate that when all the generators of Gang-Guang-E power grid are in operation, the transient stability characteristics deteriorate. The transient stability characteristics can be improved at some extend when the generators output are suppressed. The results of theoretical derivation and simulation can verify each other. With the increase of generator capacity, the transient stability characteristics of Gang- Guang-E power grid deteriorate.