考虑光伏电站高渗透接入的火电机组一次调频参数优化

Primary Frequency Parameter Optimization of Thermal Power Units Considering High-Penetration Access of Photovoltaic Power Plant

随着局部地区光伏并网容量的增加、光伏电站渗透率不断增大,光伏波动对系统电压波动和稳定特性的影响逐渐凸显,可考虑应用火电机组良好的调峰调频特性来满足更高渗透率的光伏接入。首先,通过建立非标准工况下光伏发电系统模型,分析了光伏发电的功率输出特性,阐述了不同渗透率下,光伏出力波动对系统特性的影响机理;其次,通过仿真遍历测试的方法,依据响应性能差异对比,确定优化火电机组一次调频放大倍数和时间常数的整定原则,以提高光伏电站高渗透率的接纳能力;最后,对新疆喀什地区电网进行了实际仿真验证,结果表明优化火电机组的一次调频参数有助于系统接纳光伏电站后维持其稳定运行,为光伏并网规划提供了有力支撑。

With the increasing photovoltaic（ PV） grid capacity as well as permeability of PV power,the fluctuation of PV output has obviously affected the system voltage fluctuation and the stability of the system. In addition,the good features of conventional units in peak and frequency regulation should also be considered to meet the higher permeability of PV system. Firstly,this paper analyzes the power output characteristics of PV power through the establishment of PV system model under non-standard conditions,and investigates the effects of the PV output fluctuation with different penetration rates on the bus voltage as well as its mechanism. Secondly,using the simulation traversal test method,according to the difference contrast of response performance,this paper proposes the adjust principle of optimizing the magnifications and time constant of thermal power unit to followthe PV fluctuation and improve the stability of the system with a highpenetration PV power plant access. Finally,simulation verification is also conducted on the grid of Kashgar,Xinjiang and the results showthat the optimization of the primary frequency parameters can contribute to the system stability when it accepts PV power plant,which can provide a strong support for the planning of PV grid network.