一种光伏发电并网对电力系统电压稳定的影响分析

以可再生能源发电为背景,以光伏发电并入电网后系统电压稳定研究为目的,提出将光伏发电代替发电机并入系统的方法。该方法在建立光伏和二阶等值发电机模型条件下,分析了单机无穷大系统电压随负荷变化情况,据此对发电机、光伏模型的系统电压随负荷的变化情况进行了研究,并由此对比分析发电机、光伏的出力对系统电压的影响,以充分了解光伏发电对系统电压稳定的作用。最后分析了当电压稳定时,光伏单独出力对系统的电压影响。结果表明:光伏发电代替等值发电机并网后,除有其自身的特性外,一样可以增强系统的电压稳定性。

Voltage Stability Analysis for Power System IncludingA Photovoltaic Generation Part

In order to analyse the effect of photovoltaic grid system on the voltage stability in the background of renewable energy power generation , this paper comes up with a method which using photovoltaic grid system replaced with a generator to join in the system.In this method ,the photovoltaic (pv) and second order equivalent generator model is established ,and the voltage of single machine infinite system is analyzed with the change of the load.In order to fully understand the role of photovoltaic power generation on the system voltage stability,the voltage change of the generator and the pv model with the change of load is studied, and the influence of output voltage of the generator and the photovoltaic (pv) on the system is also discussed.In the final ,this paper analysis the effect of output capacity of photovoltaic separate on the voltage of the system when the voltage is stable.Results show that the photovoltaic replacing the equivalent generator, except for its own characteristics, can enhance the system voltage stability.