针对基于电压源换流器的高压直流输电(voltage source converter based high voltage direct current,VSC-HVDC),提出了基于永磁同步风力发电机、不控整流和Boost电路的变速直流风力发电系统结构。首先给出先并后串的新型风电场结构;然...针对基于电压源换流器的高压直流输电(voltage source converter based high voltage direct current,VSC-HVDC),提出了基于永磁同步风力发电机、不控整流和Boost电路的变速直流风力发电系统结构。首先给出先并后串的新型风电场结构;然后建立最小串联系统的简化模型,用一种基于直流电压电流乘积控制的最大风能跟踪控制算法解析出输出电压和输出功率的关系。仿真结果表明:最小串联系统中的2个机组可以互不影响地独立运行,输出电压按照输出功率的变化而变化,同时2个机组均具有较好的最大风能跟踪精度和速度。展开更多
变速风力发电系统的最大功率点跟踪(Maximum Power Point Tracking,MPPT)方法在其系统运行中具有重要意义,可明显增强电能输出,但一般常忽视发电机本身的损耗问题。针对增强变速风力发电机系统的电能输出能力,提出从两个方面采取措施:...变速风力发电系统的最大功率点跟踪(Maximum Power Point Tracking,MPPT)方法在其系统运行中具有重要意义,可明显增强电能输出,但一般常忽视发电机本身的损耗问题。针对增强变速风力发电机系统的电能输出能力,提出从两个方面采取措施:一是在传统功率信号反馈法MPPT基础上,提出引入模糊PI算法处理功率反馈值与给定值的误差;二是建立异步风力发电机最小损耗点跟踪(Minimum Loss Point Tracking,MLPT)方法的数学模型,提出采用最小损耗点磁链与实时计算磁链比较,误差信号经PI调节控制发电机系统。仿真与实验证实了该复合方法对提高变速异步风力发电机系统效率,即提高电能输出能力有一定效果。展开更多
The impact of large-scale grid-connected renewable power sources, such as wind generators and solar photovoitaic systems, on transient stability of synchronous generators is discussed in this paper. The permanent magn...The impact of large-scale grid-connected renewable power sources, such as wind generators and solar photovoitaic systems, on transient stability of synchronous generators is discussed in this paper. The permanent magnet synchronous generator with variable speed wind turbine is used in the simulation analysis as a wind generator model. The transient stability analysis is performed for IEEE 9-bus system model with high-penetration renewable power sources. The effect of FRT （fault ride-through） capability implemented for each power source on the transient stability is investigated.展开更多
For the discrete-time system which is subjected to uncoupled actuator faults and sensor faults simultaneously,a robust fault diagnosis method based on a proportional integral observer (PIO) is presented.The proposed P...For the discrete-time system which is subjected to uncoupled actuator faults and sensor faults simultaneously,a robust fault diagnosis method based on a proportional integral observer (PIO) is presented.The proposed PIO uses an additionally introduced integral term of the output errors to obtain the estimationof actuator faults. Besides, the sensor faults are regarded as the augment states so that the PIO cantrace them. Moreover, the convergence of the PIO is proved. A variable speed wind turbine(VWT) exampleis given to demonstrate the fast convergence and diagnosis precision of the proposed PIO.展开更多
文摘针对基于电压源换流器的高压直流输电(voltage source converter based high voltage direct current,VSC-HVDC),提出了基于永磁同步风力发电机、不控整流和Boost电路的变速直流风力发电系统结构。首先给出先并后串的新型风电场结构;然后建立最小串联系统的简化模型,用一种基于直流电压电流乘积控制的最大风能跟踪控制算法解析出输出电压和输出功率的关系。仿真结果表明:最小串联系统中的2个机组可以互不影响地独立运行,输出电压按照输出功率的变化而变化,同时2个机组均具有较好的最大风能跟踪精度和速度。
文摘变速风力发电系统的最大功率点跟踪(Maximum Power Point Tracking,MPPT)方法在其系统运行中具有重要意义,可明显增强电能输出,但一般常忽视发电机本身的损耗问题。针对增强变速风力发电机系统的电能输出能力,提出从两个方面采取措施:一是在传统功率信号反馈法MPPT基础上,提出引入模糊PI算法处理功率反馈值与给定值的误差;二是建立异步风力发电机最小损耗点跟踪(Minimum Loss Point Tracking,MLPT)方法的数学模型,提出采用最小损耗点磁链与实时计算磁链比较,误差信号经PI调节控制发电机系统。仿真与实验证实了该复合方法对提高变速异步风力发电机系统效率,即提高电能输出能力有一定效果。
文摘The impact of large-scale grid-connected renewable power sources, such as wind generators and solar photovoitaic systems, on transient stability of synchronous generators is discussed in this paper. The permanent magnet synchronous generator with variable speed wind turbine is used in the simulation analysis as a wind generator model. The transient stability analysis is performed for IEEE 9-bus system model with high-penetration renewable power sources. The effect of FRT （fault ride-through） capability implemented for each power source on the transient stability is investigated.
基金Supported by the National Science & Technology Pillar Program in the Eleventh Five-year Plan Period (No. 2007BAF10B00).
文摘For the discrete-time system which is subjected to uncoupled actuator faults and sensor faults simultaneously,a robust fault diagnosis method based on a proportional integral observer (PIO) is presented.The proposed PIO uses an additionally introduced integral term of the output errors to obtain the estimationof actuator faults. Besides, the sensor faults are regarded as the augment states so that the PIO cantrace them. Moreover, the convergence of the PIO is proved. A variable speed wind turbine(VWT) exampleis given to demonstrate the fast convergence and diagnosis precision of the proposed PIO.
