【摘要】 为研究并网风电对电网失步振荡及解列措施的影响,基于并网风机对振荡中心影响的理论研究,在PSD-BPA机电暂态仿真软件中等效构建了典型两机系统模型,在典型两机系统模型中仿真分析了包含恒速异步(CSWT)、双馈变速(DFIG)和直驱同步(DDSG)等在内的风机类型,满出力和零出力两种极端风电出力变化方式以及高低电压保护和高低电压穿越两种风电电压穿越特性对电网失步振荡的影响。基于实际电网的仿真系统,以甘肃河西地区千万千瓦级风电基地为研究对象,研究了风电上述特性在西北实际电网中对失步振荡及解列措施的影响。典型两机系统及实际电网的结果表明:恒速异步风机会恶化系统振荡程度,对振荡中心分布的影响有限;出力方式的变化增加了系统失步的风险,对振荡中心分布的影响较小;不具备高低电压穿越特性的风电易在故障后脱网并加剧系统振荡,风电脱网后会导致系统出现新的振荡中心。更多还原

【Abstract】 To study the influence of grid-connected wind power on the out of step oscillation and splitting measure of the power grid, based on theoretical research of the impact of wind turbine on the oscillation center. The typical two machine system is built in the PSD-BPA electromechanical transient simulation software. The effect of the fan type, active power output mode and the voltage ride mode on Out-of-step oscillation are studied in typical two machine system. The fan types include constant speed wind turbine(CSWT), doubly fed induction generator(DFIG) and direct drive synchronous generator(DDSG). The active power output modes include full and zero active power output of wind farm. The voltage ride modes include the high and low voltage ride through and high and low voltage protect.Regard million kilowatts of wind power base as the research object in the Hexi region of Gansu of actual power grid. Studied the effects of wind power on the out-of-step oscillation and splitting measures in actual power system. The result of typical two machine system and the actual power grid show that, the degree of the system oscillation worsen in CCST wind turbine, the influence of the oscillation center distribution is limited. The change of active power output mode increases the risk of system failure, and has little influence on the distribution of the oscillation center. Does not have the characteristics of high and low voltage ride through wind power easily off-grid after a fault. This exacerbate the degree of oscillation, and will lead to a new center of the oscillation appears.更多还原