Wide area damping controller(WADC) is usually utilized to damp interarea low frequency oscillation in power system. However, conventional WADC design method neglects the influence of signal transmission delay and damp...Wide area damping controller(WADC) is usually utilized to damp interarea low frequency oscillation in power system. However, conventional WADC design method neglects the influence of signal transmission delay and damping performance of WADC designed by the conventional method may deteriorate or even has no effect when signal transmission delay is beyond delay margin, an index that denotes delay endurance degree of power system. Therefore, a new design method for WADC under the condition of expected damping factor and required signal transmission delay is presented in this work. An improved delay margin with less conservatism is derived by adopting a new Lyapunov-Krasovskii function and more compact bounding technique on the derivative of Lyapunov-Krasovskii functional. The improved delay margin, which constructs the correlation of damping factor and signal transmission delay, can be used to design WADC. WADC designed by the proposed method can ensure that power system satisfies expected damping factor when WADC input signal is delayed within delay margin. Satisfactory test results demonstrate the effectiveness of the proposed method.展开更多
Because of the large-scale integration of wind power,the dynamic characteristics of power system have many uncertain effects.Based on deterministic analysis methods,traditional on-line security assessment system canno...Because of the large-scale integration of wind power,the dynamic characteristics of power system have many uncertain effects.Based on deterministic analysis methods,traditional on-line security assessment system cannot quantitatively estimate the actual operating conditions of the power system for only considering the most serious and credible accidents.Therefore,the risk theory is introduced into an on-line security assessment system and then an on-line risk assessment system for wind power is designed and implemented by combining with the dynamic security assessment system.Based on multiple data integration,the wind power disturbance probability is available and the security assessment of the power grid can obtain security indices in different aspects.The operating risk index is an expectation of severity,computed by summing up all the products of the result probability and its severity.Analysis results are reported to the dispatchers in on-line environment,while the comprehensive weak links are automatically provided to the power dispatching center.The risk assessment system in operation can verify the reasonableness of the system.展开更多
In large inter connected power systems, inter-area oscillations are turned to be a severe problem. Hence inter-area oscillations cause severe problems like damage to generators, reduce the power transfer capability of...In large inter connected power systems, inter-area oscillations are turned to be a severe problem. Hence inter-area oscillations cause severe problems like damage to generators, reduce the power transfer capability of transmission lines, increase wear and tear on network components, increase line losses etc. This paper is to maintain the stability of system by damping inter-area oscillations. Implementation of new equipment consists of high power electronics based technologies such as FACTs and proper controller design has become an essential to provide better damping performance than Power System Stabilizer (PSS). With development of Wide Area Measurement System (WAMS), remote signals have become as feedback signals to design Wide Area Damping Controller (WADC) for FACTs devices. In this work, POD is applied to both SVC and SSSC. Simulation studies are carried out in Power System Analysis Toolbox (PSAT) environment to evaluate the effectiveness of the FACTs controller in a large area power system. Results show that extensive analysis of FACTs controller for improving stability of system.展开更多
为了解决传统的电力系统稳定器PSS(Power System Stabilizer)因局限于反馈本地信号而不能很好地抑制区域模式的问题,针对区域模式装设引入广域测量信号的PSS,针对地区模式装设引入本地信号的PSS。根据参与因子确定PSS装设地点,然后应用...为了解决传统的电力系统稳定器PSS(Power System Stabilizer)因局限于反馈本地信号而不能很好地抑制区域模式的问题,针对区域模式装设引入广域测量信号的PSS,针对地区模式装设引入本地信号的PSS。根据参与因子确定PSS装设地点,然后应用遗传算法对其参数进行协调。由于PSS反馈远方信号,设计时考虑了通信延迟的影响。算例表明,提出的方案能够较好地抑制低频振荡。展开更多
该文从如何减小通信网络的影响角度,提出了实现电力系统广域PSS闭环控制架构,具有与数据上行通道结合的控制下行通道,控制终端可同步授时以实现同步控制及闭环时延补偿,实现远方信号反馈及广域协调控制。在此基础上结合应用环境实现了...该文从如何减小通信网络的影响角度,提出了实现电力系统广域PSS闭环控制架构,具有与数据上行通道结合的控制下行通道,控制终端可同步授时以实现同步控制及闭环时延补偿,实现远方信号反馈及广域协调控制。在此基础上结合应用环境实现了贵州电网的广域电力系统稳定器PSS(power system stabilizer)闭环控制系统。并阐述了广域阻尼闭环控制系统的关键技术,设计了控制下行通道的通信规约。该文最后对该架构进行了RTDS硬件闭环测试,测试结果表明,该架构可有效实现广域PSS闭环控制。展开更多
基金Project(51007042) supported by the National Natural Science Foundation of China
文摘Wide area damping controller(WADC) is usually utilized to damp interarea low frequency oscillation in power system. However, conventional WADC design method neglects the influence of signal transmission delay and damping performance of WADC designed by the conventional method may deteriorate or even has no effect when signal transmission delay is beyond delay margin, an index that denotes delay endurance degree of power system. Therefore, a new design method for WADC under the condition of expected damping factor and required signal transmission delay is presented in this work. An improved delay margin with less conservatism is derived by adopting a new Lyapunov-Krasovskii function and more compact bounding technique on the derivative of Lyapunov-Krasovskii functional. The improved delay margin, which constructs the correlation of damping factor and signal transmission delay, can be used to design WADC. WADC designed by the proposed method can ensure that power system satisfies expected damping factor when WADC input signal is delayed within delay margin. Satisfactory test results demonstrate the effectiveness of the proposed method.
基金supported by National High Technology Research and Development Program of China (863 Program) (No.2011AA05A118)
文摘Because of the large-scale integration of wind power,the dynamic characteristics of power system have many uncertain effects.Based on deterministic analysis methods,traditional on-line security assessment system cannot quantitatively estimate the actual operating conditions of the power system for only considering the most serious and credible accidents.Therefore,the risk theory is introduced into an on-line security assessment system and then an on-line risk assessment system for wind power is designed and implemented by combining with the dynamic security assessment system.Based on multiple data integration,the wind power disturbance probability is available and the security assessment of the power grid can obtain security indices in different aspects.The operating risk index is an expectation of severity,computed by summing up all the products of the result probability and its severity.Analysis results are reported to the dispatchers in on-line environment,while the comprehensive weak links are automatically provided to the power dispatching center.The risk assessment system in operation can verify the reasonableness of the system.
文摘In large inter connected power systems, inter-area oscillations are turned to be a severe problem. Hence inter-area oscillations cause severe problems like damage to generators, reduce the power transfer capability of transmission lines, increase wear and tear on network components, increase line losses etc. This paper is to maintain the stability of system by damping inter-area oscillations. Implementation of new equipment consists of high power electronics based technologies such as FACTs and proper controller design has become an essential to provide better damping performance than Power System Stabilizer (PSS). With development of Wide Area Measurement System (WAMS), remote signals have become as feedback signals to design Wide Area Damping Controller (WADC) for FACTs devices. In this work, POD is applied to both SVC and SSSC. Simulation studies are carried out in Power System Analysis Toolbox (PSAT) environment to evaluate the effectiveness of the FACTs controller in a large area power system. Results show that extensive analysis of FACTs controller for improving stability of system.
文摘为了解决传统的电力系统稳定器PSS(Power System Stabilizer)因局限于反馈本地信号而不能很好地抑制区域模式的问题,针对区域模式装设引入广域测量信号的PSS,针对地区模式装设引入本地信号的PSS。根据参与因子确定PSS装设地点,然后应用遗传算法对其参数进行协调。由于PSS反馈远方信号,设计时考虑了通信延迟的影响。算例表明,提出的方案能够较好地抑制低频振荡。
文摘该文从如何减小通信网络的影响角度,提出了实现电力系统广域PSS闭环控制架构,具有与数据上行通道结合的控制下行通道,控制终端可同步授时以实现同步控制及闭环时延补偿,实现远方信号反馈及广域协调控制。在此基础上结合应用环境实现了贵州电网的广域电力系统稳定器PSS(power system stabilizer)闭环控制系统。并阐述了广域阻尼闭环控制系统的关键技术,设计了控制下行通道的通信规约。该文最后对该架构进行了RTDS硬件闭环测试,测试结果表明,该架构可有效实现广域PSS闭环控制。
