以高压直流输电系统快速可控为出发点,采用极大极小值原理和改进粒子群优化算法相结合的新方法,针对向家坝—上海±800 k V特高压直流输电系统送端可能发生的次同步振荡(sub-synchronous oscillation,SSO)问题,建立一种基于比例积...以高压直流输电系统快速可控为出发点,采用极大极小值原理和改进粒子群优化算法相结合的新方法,针对向家坝—上海±800 k V特高压直流输电系统送端可能发生的次同步振荡(sub-synchronous oscillation,SSO)问题,建立一种基于比例积分微分控制的UHVDC附加次同步振荡阻尼控制器(subsynchronous oscillation damping controller,SSDC)模型。对不同方式的时域仿真结果表明,该SSDC控制器能够有效抑制交直流互联电网送端系统汽轮机组的轴系扭振,可在相当大范围内保证系统的SSO稳定性,具有较强的鲁棒性。展开更多
风力发电并网容量的提高对电力系统阻尼特性的影响越来越明显,需研究相关措施来改善风电并网后系统阻尼特性。构建了含统一潮流控制器UPFC(Unified Power Flow Controller)的风电并网系统数学模型,设计了UPFC附加功率振荡阻尼控制器,以I...风力发电并网容量的提高对电力系统阻尼特性的影响越来越明显,需研究相关措施来改善风电并网后系统阻尼特性。构建了含统一潮流控制器UPFC(Unified Power Flow Controller)的风电并网系统数学模型,设计了UPFC附加功率振荡阻尼控制器,以IEEE 2区域4机系统为例,从特征根分析和动态时域仿真两方面系统地分析了所提UPFC对含风电电力系统阻尼特性的改善效果。研究结果表明,所设计的UPFC增强了含风电电力系统的阻尼效果,使互联系统在高联络线传输功率下仍可稳定运行。展开更多
A single machine-infinite-bus(SMIB) system including the interline power flow controllers(IPFCs) and the power system stabilizer(PSS) controller is addressed. The linearized system model is considered for investigatin...A single machine-infinite-bus(SMIB) system including the interline power flow controllers(IPFCs) and the power system stabilizer(PSS) controller is addressed. The linearized system model is considered for investigating the interactions among IPFC and PSS controllers. To improve the stability of whole system again different disturbances, a lead-lag controller is considered to produce supplementary signal. The proposed supplementary controller is implemented to improve the damping of the power system low frequency oscillations(LFOs). Imperialist optimization algorithm(ICA) and shuffled frog leaping algorithm(SFLA) are implemented to search for optimal supplementary controllers and PSS parameters. Moreover, singular value decomposition(SVD) method is utilized to select the most effective damping control signal of IPFC lead-lag controllers. To evaluate the system performance, different operating conditions are considered. Reponses of system in five modes including uncoordinated and coordinated modes of IPFC and PSS using ICA and SFLA are studied and compared. Considering the results, response of system without controller shows the highest overshoot and the longest settling time for rotor angel at the different operating conditions. In this mode of system, rotor speed has the highest overshoot. Rotor angel in the system with only PSS includes lower overshoot and oscillation than system without controller. When PSS is only implemented, rotor speed deviation has the longest settling time. Rotor speed deviation in the uncoordinated mode of IPFC and PSS shows lower overshoot than system with only PSS and without controller. It is noticeable that in this mode, rotor angel has higher overshoot than system with only PSS. The superiority of the suggested ICA-based coordinated controllers is obvious compared with SFLA-based coordinated controllers and other system modes. Responses of coordinated PSS and IPFC SFLA-based supplementary controllers include higher peak amplitude and longer settling time compared with coordinated IPFC and PSS ICA-based controllers. This comparison shows that overshoots, undershoots and the settling times are reduced considerably in coordinated mode of IPFC based controller and PSS using ICA. Analysis of the system performance shows that the proposed method has excellent response to different faults in power system.展开更多
文摘风力发电并网容量的提高对电力系统阻尼特性的影响越来越明显,需研究相关措施来改善风电并网后系统阻尼特性。构建了含统一潮流控制器UPFC(Unified Power Flow Controller)的风电并网系统数学模型,设计了UPFC附加功率振荡阻尼控制器,以IEEE 2区域4机系统为例,从特征根分析和动态时域仿真两方面系统地分析了所提UPFC对含风电电力系统阻尼特性的改善效果。研究结果表明,所设计的UPFC增强了含风电电力系统的阻尼效果,使互联系统在高联络线传输功率下仍可稳定运行。
文摘A single machine-infinite-bus(SMIB) system including the interline power flow controllers(IPFCs) and the power system stabilizer(PSS) controller is addressed. The linearized system model is considered for investigating the interactions among IPFC and PSS controllers. To improve the stability of whole system again different disturbances, a lead-lag controller is considered to produce supplementary signal. The proposed supplementary controller is implemented to improve the damping of the power system low frequency oscillations(LFOs). Imperialist optimization algorithm(ICA) and shuffled frog leaping algorithm(SFLA) are implemented to search for optimal supplementary controllers and PSS parameters. Moreover, singular value decomposition(SVD) method is utilized to select the most effective damping control signal of IPFC lead-lag controllers. To evaluate the system performance, different operating conditions are considered. Reponses of system in five modes including uncoordinated and coordinated modes of IPFC and PSS using ICA and SFLA are studied and compared. Considering the results, response of system without controller shows the highest overshoot and the longest settling time for rotor angel at the different operating conditions. In this mode of system, rotor speed has the highest overshoot. Rotor angel in the system with only PSS includes lower overshoot and oscillation than system without controller. When PSS is only implemented, rotor speed deviation has the longest settling time. Rotor speed deviation in the uncoordinated mode of IPFC and PSS shows lower overshoot than system with only PSS and without controller. It is noticeable that in this mode, rotor angel has higher overshoot than system with only PSS. The superiority of the suggested ICA-based coordinated controllers is obvious compared with SFLA-based coordinated controllers and other system modes. Responses of coordinated PSS and IPFC SFLA-based supplementary controllers include higher peak amplitude and longer settling time compared with coordinated IPFC and PSS ICA-based controllers. This comparison shows that overshoots, undershoots and the settling times are reduced considerably in coordinated mode of IPFC based controller and PSS using ICA. Analysis of the system performance shows that the proposed method has excellent response to different faults in power system.
