CAJ | 학술논문

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。
재연구쌍궤풍력발전궤조여전망동태작용시，통상홀략축계적유성작용，채용집총질량괴모형묘술풍궤급기전동련。저주요시기우통과변류기공제가이유효억제축계진탕적인식。사실상，병불시소유상용적궤조공제책략도능통과변류기제공량호적전기조니，재소우동혹잠태고장하격발적축계진탕여과득불도유효억제，장직접도치궤조전속실은，진이영향도전력계통적은정。해문침대쌍궤궤조재불동공제책략하대축계진탕적조니작용진행료연구，통과소신호공제모형분석득출결론：채용발전궤전속반궤신호적전속공제모식화채용풍륜전속반궤신호적항공솔공제모식능구제공량호전기조니，억제축계진탕。최후경PSCAD/EMTDC건모방진대결론진행료험증。
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.