双馈风电机组的不同控制策略对轴系振荡的阻尼作用  

Damping Effects on Torsional Oscillation of DFIG Drive-chain Using Different Control Strategies

作　　者：张琛[1] 李征[1] 高强[1] 蔡旭[1] 汪宁勃[2] 

机构地区：[1]上海交通大学风力发电研究中心,上海市闵行区200240 [2]甘肃省电力公司风电技术中心,甘肃省兰州市730050

出　　处：《中国电机工程学报》2013年第27期135-144,19,共10页Proceedings of the CSEE

基　　金：国家863高技术基金项目(003 2011AA05A104);国家电网科技项目(电网友好型大型风电场关键技术研究与示范)~~

摘　　要：在研究双馈风力发电机组与电网动态作用时,通常忽略轴系的柔性作用,采用集总质量块模型描述风机及其传动链。这主要是基于通过变流器控制可以有效抑制轴系振荡的认识。事实上,并不是所有常用的机组控制策略都能通过变流器提供良好的电气阻尼,在小扰动或暂态故障下激发的轴系振荡如果得不到有效抑制,将直接导致机组转速失稳,进而影响到电力系统的稳定。该文针对双馈机组在不同控制策略下对轴系振荡的阻尼作用进行了研究,通过小信号控制模型分析得出结论:采用发电机转速反馈信号的转速控制模式和采用风轮转速反馈信号的恒功率控制模式能够提供良好电气阻尼,抑制轴系振荡。最后经PSCAD/EMTDC建模仿真对结论进行了验证。The soft connection of drive-chain system is usually ignored so that one mass model is used to express the wind turbine and drive chain when dynamic interaction between doubly-fed induction generator （DFIG） and the grid is discussed. This was due to the knowledge of converter could provide enough damping for torsional oscillation caused by soft drive-chain system. In fact, damping effect provided by the converter is dominated by the control strategy of DFIG. If the torsional oscillation could not be damped effectively, DFIG will lose rotor speed stability and this would further affect power system stability. Therefore, in this paper, the damping effects on torsional oscillation with different control strategies were exposed through small signal analysis and then verified by numerical simulation on PSCAD/EMTDC. It is shown that speed control mode with generator speed feedback and constant power control mode with wind turbine rotor speed feedback can provide positive damping factor, so the torsional oscillation of drive-chain is effectively damped out.

关 键 词：双馈风电机组 轴系 扭振 阻尼 控制策略 小信号分析法 

分 类 号：TM614[电气工程—电力系统及自动化]