空间电磁对接具有不消耗推进剂、连续可逆控制能力和无羽流污染等优点,应用前景广阔。空间电磁对接控制难点在于强非线性、不确定性以及耦合性等问题。为此,论文综合采用线性扩张状态观测器(LESO,Line Extended State Observer)、反馈...空间电磁对接具有不消耗推进剂、连续可逆控制能力和无羽流污染等优点,应用前景广阔。空间电磁对接控制难点在于强非线性、不确定性以及耦合性等问题。为此,论文综合采用线性扩张状态观测器(LESO,Line Extended State Observer)、反馈线性化以及鲁棒H∞控制技术,设计空间电磁对接的鲁棒协调控制,并通过仿真检验所设计控制方案的性能及其鲁棒性。仿真结果表明,所设计的控制器不但可以观测到系统所有状态变量,而且能提高系统对模型不确定性以及外界干扰的鲁棒性,跟踪控制性能良好。展开更多
An advanced nonlinear robust control scheme is proposed for multi-machine power systems equipped with thyristor-controlled series compensation (TCSC). First, a decentralized nonlinear robust control approach based on ...An advanced nonlinear robust control scheme is proposed for multi-machine power systems equipped with thyristor-controlled series compensation (TCSC). First, a decentralized nonlinear robust control approach based on the feedback linearization and H∞ theory is introduced to eliminate the nonlinearities and interconnections of the studied system, and to attenuate the exogenous disturbances that enter die system. Then, a system model is built up, which has considered all the generators’ and TCSC’s dynamics, and the effects of uncertainties such as disturbances. Next, a decentralized nonlinear robust coordinated control law is developed based on this model. Simulation results on a six-machine power system show that the transient stability of the power system is obviously improved and die power transfer capacity of long distance transmission lines is enhanced regardless of fault locations and system operation points. In addition, the control law has engineering practicality since all the variables in the expression of he control strategy can be measured locally.展开更多
Process of optimizing coordinated control is divided into two stages. At the first stage, the study improves a robust optimal control model of single-point intersection to optimize cycle and split. At the second stage...Process of optimizing coordinated control is divided into two stages. At the first stage, the study improves a robust optimal control model of single-point intersection to optimize cycle and split. At the second stage, the study combines all links with intersections of arterial road as a complete system, and applies cell transmission model to simulate traffic flow on urban signalized arterial road. We propose a coordinated control model based on the platform to optimize offset between adjacent intersections. Genetic algorithm is executed by MATLAB to solve the model. The performance evaluations show that the model not only effectively reduces average delay and stopping rate of vehicles on arterial road and largely enhances traffic capacity of arterial road, but also lowers the sensitivity of signal control for flow fluctuations.展开更多
针对多机电力系统中,发电机励磁和静止同步串联补偿器(static synchronous series compensator,SSSC)的协调控制问题,引入广义Hamilton系统理论,进行非线性协调控制器设计。SSSC采用考虑内部动态的三阶模型,并将SSSC与各台发电机的相互...针对多机电力系统中,发电机励磁和静止同步串联补偿器(static synchronous series compensator,SSSC)的协调控制问题,引入广义Hamilton系统理论,进行非线性协调控制器设计。SSSC采用考虑内部动态的三阶模型,并将SSSC与各台发电机的相互作用用附加电磁功率表示。将包含发电机励磁和SSSC的多机电力系统描述成广义耗散Hamilton系统形式,利用边界函数法和L2干扰抑制控制方法设计了发电机励磁和SSSC的协调控制器。四机两区域系统的仿真结果表明:与传统的分散控制器相比,所提的非线性协调控制器能够有效地提高系统的暂态稳定性和电压调节性能。展开更多
文摘空间电磁对接具有不消耗推进剂、连续可逆控制能力和无羽流污染等优点,应用前景广阔。空间电磁对接控制难点在于强非线性、不确定性以及耦合性等问题。为此,论文综合采用线性扩张状态观测器(LESO,Line Extended State Observer)、反馈线性化以及鲁棒H∞控制技术,设计空间电磁对接的鲁棒协调控制,并通过仿真检验所设计控制方案的性能及其鲁棒性。仿真结果表明,所设计的控制器不但可以观测到系统所有状态变量,而且能提高系统对模型不确定性以及外界干扰的鲁棒性,跟踪控制性能良好。
基金This work was supported by Chinese National Natural Science Foundation(No.50377018)Chinese National Key Basic Research Fund(No.G1998020309)by New Energy and Industrial Technology Development Organization of Japan.
文摘An advanced nonlinear robust control scheme is proposed for multi-machine power systems equipped with thyristor-controlled series compensation (TCSC). First, a decentralized nonlinear robust control approach based on the feedback linearization and H∞ theory is introduced to eliminate the nonlinearities and interconnections of the studied system, and to attenuate the exogenous disturbances that enter die system. Then, a system model is built up, which has considered all the generators’ and TCSC’s dynamics, and the effects of uncertainties such as disturbances. Next, a decentralized nonlinear robust coordinated control law is developed based on this model. Simulation results on a six-machine power system show that the transient stability of the power system is obviously improved and die power transfer capacity of long distance transmission lines is enhanced regardless of fault locations and system operation points. In addition, the control law has engineering practicality since all the variables in the expression of he control strategy can be measured locally.
基金supported by the National Natural Science Foundation of China(No.61174175)the Science & Technology Development Plan of Shandong Province(No.2011GGX10504)+4 种基金the Science Foundation of Shandong Jiaotong University(No.Z201111)the Natural Science Foundation of Shandong Province(No.ZR2009GM032)the Independent Innovation Foundation of Shandong University(No.2009TS046)the Natural Science Foundation of Shandong Province(No.ZR2010FM036)the Science & Technology Projects of Higher Education of Shangdong Province(No. J09LG55)
文摘Process of optimizing coordinated control is divided into two stages. At the first stage, the study improves a robust optimal control model of single-point intersection to optimize cycle and split. At the second stage, the study combines all links with intersections of arterial road as a complete system, and applies cell transmission model to simulate traffic flow on urban signalized arterial road. We propose a coordinated control model based on the platform to optimize offset between adjacent intersections. Genetic algorithm is executed by MATLAB to solve the model. The performance evaluations show that the model not only effectively reduces average delay and stopping rate of vehicles on arterial road and largely enhances traffic capacity of arterial road, but also lowers the sensitivity of signal control for flow fluctuations.
文摘针对多机电力系统中,发电机励磁和静止同步串联补偿器(static synchronous series compensator,SSSC)的协调控制问题,引入广义Hamilton系统理论,进行非线性协调控制器设计。SSSC采用考虑内部动态的三阶模型,并将SSSC与各台发电机的相互作用用附加电磁功率表示。将包含发电机励磁和SSSC的多机电力系统描述成广义耗散Hamilton系统形式,利用边界函数法和L2干扰抑制控制方法设计了发电机励磁和SSSC的协调控制器。四机两区域系统的仿真结果表明:与传统的分散控制器相比,所提的非线性协调控制器能够有效地提高系统的暂态稳定性和电压调节性能。
