不同风电机组接入电网的暂态电压稳定性研究

Research on Transient Voltage Stability when Different Wind Power Generators Integrated with Power Grid

在中国,因为特殊的地理环境,风电装机容量在整个电网中的占有率得到激增,风电场一般建设在电力系统输电网的末端,且地区经济不发达,网架结构较弱。但风电的快速发展,使得在短时间内大规模风电场集中接入电网,给电网的有功和无功平衡带来大幅度波动,这种大的扰动严重威胁到电网的暂态电压稳定。因此建立了基于普通异步风力发电机组(AWT)、双馈异步风力发电机组(DFIG)的暂态数学模型,并以新疆北部某一地区作为算例仿真分析了这两种风力发电机组以不同比例接入系统后的暂态电压稳定性。根据仿真得出的临界故障清除时间(CCT)表明,双馈风力发电机组接入系统时的暂态电压比普通异步风力发电机组接入系统更稳定。

In China, the installed capacity of wind power in the whole power grid is increasing due to the special geographical environment .The construction of wind farms is generally located in the transmission end of power system , the regional econo-my is not developed and the grid structure is weak .But with the rapid development of wind power , the large-scale wind farms in a short period of time are concentrated in power grid , which makes a drastic fluctuation for the balance of active power and reactive power in power grid and makes a serious threat to the transient voltage stability of power grid .The transient mathemat-ical models based on common asynchronous wind turbine （AWT） and doubly-fed induction generator （DFIG） are estab-lished, and taking the simulation of a certain area in the north of Xinjiang for example , the transient voltage stability of these two kinds of wind power generator units are analyzed .The critical clearing time （ CCT ） obtained from the simulation shows that the transient voltage of DFIG is more stable than that of AWT when they are integrated with power grid .