【摘要】 研究风机与同步机动态间的交互作用机理对于揭示风电并网对电力系统小扰动功角稳定特性的影响,指导含大规模风电的电力系统稳定控制具有重要的理论价值和现实意义。该文针对单双馈风机单同步机无穷大系统,从动态响应互作用的角度分析双馈风机与同步机的交互作用机理。首先建立了同步机功角与双馈风机锁相环输出动态的小扰动分析模型。其次,基于小扰动分析模型解的特性,分析了不同锁相环输出动态对同步机功角动态响应的影响,以及同步机功角振荡对双馈风机锁相环输出动态的影响,揭示了双馈风机锁相环动态与同步机功角动态间的交互作用机理。研究结果表明,双馈风机锁相环和同步机动态间的交互影响与锁相环模态和同步机功角模态有关,当两模态振荡频率接近时,两模态阻尼特性将发生变化。最后,通过仿真与模态分析验证了该机理研究的正确性。更多还原

【Abstract】 Mechanism study on the dynamic interaction between wind generators and synchronous generators has great theory significance and engineering value not only to reveal the effect of wind power integration on power system small signal stability, but also to guide the stability control of power system integrated with large-scale wind generation. In this paper, the interaction mechanism between doubly-fed induction generator(DFIG) and synchronous generator was studied from the perspective of dynamic response, based on a single synchronous machine infinite bus system with a single DFIG integrated. First of all, the small signal dynamic models of synchronous generator power angle and phase-locked loop(PLL) output were derived. Then, the influence of PLL output dynamics on synchronous generator power angle and the effect of synchronous generator power angle dynamics on PLL output were analyzed. Furthermore, the interaction mechanism between PLL and synchronous generator was revealed. The results show that the interaction between PLL and synchronous generator is related to the synchronous machine and PLL oscillation modes. When the frequencies of the two modes are close, the damping characteristics of the two modes will change. In the end, the rationality of the conclusions is verified by the time domain simulation and modal analysis results.更多还原