大规模交直流混合电网的建设和发展,对电力系统稳定和控制在空间广度和时间维度上提出了更高的要求。广域测量系统(Wide Area Measurement System,WAMS)的同步量测数据在空间和时间上满足上述要求,因而研究WAMS技术在电力系统中的应用...大规模交直流混合电网的建设和发展,对电力系统稳定和控制在空间广度和时间维度上提出了更高的要求。广域测量系统(Wide Area Measurement System,WAMS)的同步量测数据在空间和时间上满足上述要求,因而研究WAMS技术在电力系统中的应用十分必要。从WAMS的结构和原理出发,总结了近五年来广域测量系统在电力系统动态监测与故障分析、辨识与估计、系统稳定控制和广域保护等方面的研究进展,并详细分析了其中存在的问题。最后展望了广域测量技术需要进一步研究的问题,指出基于WAMS技术构建大规模互联电力系统的广域安全监测及控制系统是一个很有意义的研究方向。展开更多
基于电力系统数据传输网络和广域同步测量技术,提出1种用于抑制电力系统低频振荡的可介入式广域电力系统稳定器(power system stabilizer,PSS);利用可介入式广域PSS,调度通信中心可通过电力数据网络对其进行整定、控制策略修改以及投入...基于电力系统数据传输网络和广域同步测量技术,提出1种用于抑制电力系统低频振荡的可介入式广域电力系统稳定器(power system stabilizer,PSS);利用可介入式广域PSS,调度通信中心可通过电力数据网络对其进行整定、控制策略修改以及投入和退出控制。通过与常规PSS比较,可介入式广域PSS能够根据运行方式的变化,实时修改PSS的控制策略和参数,更好地抑制电力系统低频振荡。利用4机2区域系统的时域仿真验证了该方法的有效性。展开更多
A method is proposed to monitor and control Hopf bifurcations in multi-machine power systems using the information from wide area measurement systems (WAMSs). The power method (PM) is adopted to compute the pair of co...A method is proposed to monitor and control Hopf bifurcations in multi-machine power systems using the information from wide area measurement systems (WAMSs). The power method (PM) is adopted to compute the pair of conjugate eigenvalues with the algebraically largest real part and the corresponding eigenvectors of the Jacobian matrix of a power system. The distance between the current equilibrium point and the Hopf bifurcation set can be monitored dynamically by computing the pair of con- jugate eigenvalues. When the current equilibrium point is close to the Hopf bifurcation set, the approximate normal vector to the Hopf bifurcation set is computed and used as a direction to regulate control parameters to avoid a Hopf bifurcation in the power system described by differential algebraic equations (DAEs). The validity of the proposed method is demonstrated by regulating the reactive power loads in a 14-bus power system.展开更多
By system analysis and imitating modeling authors show the most effective modern techniques for railway electric systems control. Modem measure technologies PMU-WAMS and smart grid allow to solve real time tasks of ce...By system analysis and imitating modeling authors show the most effective modern techniques for railway electric systems control. Modem measure technologies PMU-WAMS and smart grid allow to solve real time tasks of centralizing control of railway electric systems. Quantity characteristics of control effectiveness are determined. According to computer modeling the situation approach is available for practical tasks of railway electric system control.展开更多
文摘大规模交直流混合电网的建设和发展,对电力系统稳定和控制在空间广度和时间维度上提出了更高的要求。广域测量系统(Wide Area Measurement System,WAMS)的同步量测数据在空间和时间上满足上述要求,因而研究WAMS技术在电力系统中的应用十分必要。从WAMS的结构和原理出发,总结了近五年来广域测量系统在电力系统动态监测与故障分析、辨识与估计、系统稳定控制和广域保护等方面的研究进展,并详细分析了其中存在的问题。最后展望了广域测量技术需要进一步研究的问题,指出基于WAMS技术构建大规模互联电力系统的广域安全监测及控制系统是一个很有意义的研究方向。
文摘基于电力系统数据传输网络和广域同步测量技术,提出1种用于抑制电力系统低频振荡的可介入式广域电力系统稳定器(power system stabilizer,PSS);利用可介入式广域PSS,调度通信中心可通过电力数据网络对其进行整定、控制策略修改以及投入和退出控制。通过与常规PSS比较,可介入式广域PSS能够根据运行方式的变化,实时修改PSS的控制策略和参数,更好地抑制电力系统低频振荡。利用4机2区域系统的时域仿真验证了该方法的有效性。
基金the National Natural Science Foundation of China (Nos. 50595414 and 50507018)the National Key Technolo-gies Supporting Program of China during the 11th Five-Year Plan Period (No. 2006BAA02A01)the Key Grant Project of MOE, China (No. 305008)
文摘A method is proposed to monitor and control Hopf bifurcations in multi-machine power systems using the information from wide area measurement systems (WAMSs). The power method (PM) is adopted to compute the pair of conjugate eigenvalues with the algebraically largest real part and the corresponding eigenvectors of the Jacobian matrix of a power system. The distance between the current equilibrium point and the Hopf bifurcation set can be monitored dynamically by computing the pair of con- jugate eigenvalues. When the current equilibrium point is close to the Hopf bifurcation set, the approximate normal vector to the Hopf bifurcation set is computed and used as a direction to regulate control parameters to avoid a Hopf bifurcation in the power system described by differential algebraic equations (DAEs). The validity of the proposed method is demonstrated by regulating the reactive power loads in a 14-bus power system.
文摘By system analysis and imitating modeling authors show the most effective modern techniques for railway electric systems control. Modem measure technologies PMU-WAMS and smart grid allow to solve real time tasks of centralizing control of railway electric systems. Quantity characteristics of control effectiveness are determined. According to computer modeling the situation approach is available for practical tasks of railway electric system control.
