并网双馈电场的不同运行方式对接入系统的电压稳定性影响分析

摘要

随着大规模风电并网，电力系统在保证其自身可靠运行方面面临着巨大的挑战，同时也给维持并网地区电压稳定带来了前所未有的难度。本文对由双馈式风电机组构成的并网风场进行分析，首先构建了双馈风电机组的简化数学模型，然后分别研究了恒功率因数和恒电压两种运行方式下的无功电压控制策略，并且通过绘制各控制方式下的PV曲线，进一步分析了风场在两种运行方式下对系统电压稳定性的影响，从双馈风场的运行角度，为系统安全稳定运行提供了分析依据。通过对风速扰动和无穷大电网电压跌落两种情况下的仿真分析，验证了双馈机的恒压运行方式在参与系统无功调节方面的积极作用。%With a large integration of wind power, there is huge challenge to guarantee the reliability of the power system itself and the stability of voltage is unprecedentedly difficult. Wind farms composed of doubly-fed wind turbine were analyzed in this paper.Firstly, the simplified mathematical model of doubly-fed wind generator is build , and then,the reactive voltage control strategy was studied un-der the two kinds of operation modes of constant power factor mode and constant voltage mode, andanalyzing the influence on system voltage stability under two kinds of operation modes by mappingthe PV curve under two control mode , It provide the analysis basis for the system safe and stable operation by the view of the running of doubly-fed wind farm. Wind speed variations and voltage drop has been simulated and result show that the constant voltage mode play a positive role in reactive power regulation of system.