基于PSASP的光伏并网系统建模与稳定性研究

摘要

System modeling and stability of grid⁃connected PV power station are studied in this paper. Under PSASP simulation envi⁃ronment, electromechanical transient models of photovoltaic battery, MPPT controller, battery pack , inverter and DC⁃DC booster are developed, model of under/over voltage protection, model of under/over frequency protection, model of overcurrent, short⁃circuit pro⁃tection and model of voltage unbalance protection are researched. By these models application , a simulation model for power system stability analysis is established. Based on a western isolated grid with PV power station connected , the grid trend effect of PV power connected to the grid by different supply capacity and different power factor, the transient stability effect under fault disturbance are re⁃searched, the accuracy of this model is proved.%在PSASP仿真环境下，开发了光伏并网发电系统中的光伏电池、 MPPT控制器、蓄电池组、逆变器及DC－DC升压器的机电暂态模型，研究了光伏并网保护系统中的过／欠电压保护、过／欠频保护、过电流及短路电流保护、电压不平衡保护模型，应用这些模型建立了可用于电力系统稳定性分析的光伏电站仿真模型。最后，以接入光伏电站的某西部孤立电网为例，研究了光伏电源不同容量、不同功率因数接入方式对电网潮流的影响，以及故障扰动下的暂态稳定影响，验证了模型的正确性。