高比例可再生能源由于其不确定性等特点给电力系统的稳定运行带来了巨大挑战,因此更加快速稳定的电力系统调节能力需要多种灵活性资源的共同参与。为此,基于调度层面提出一种系统整体灵活性指标(Overall System Flexibility, OSF)。首...高比例可再生能源由于其不确定性等特点给电力系统的稳定运行带来了巨大挑战,因此更加快速稳定的电力系统调节能力需要多种灵活性资源的共同参与。为此,基于调度层面提出一种系统整体灵活性指标(Overall System Flexibility, OSF)。首先分析系统净负荷、机组、储能和联络线的灵活性特点并建立灵活性模型。提出一种基于能力要素的确定型指标,该指标能够将各部分资源作为一个整体来描述系统的灵活性。然后建立了考虑区域互联的电力系统调度模型并对指标进行计算。算例基于三区域IEEE RTS96系统,选取其中10个机组数据,从储能、联络线、备用容量等方面进行验证。计算出系统灵活性指标并对比分析,结果表明所提指标可以直观地反映系统的整体灵活性。展开更多
The robust guaranteed cost sampled-data control was studied for a class of uncertain nonlinear systems with time-varying delay. The parameter uncertainties are time-varying norm-bounded and appear in both the state an...The robust guaranteed cost sampled-data control was studied for a class of uncertain nonlinear systems with time-varying delay. The parameter uncertainties are time-varying norm-bounded and appear in both the state and the input control matrices. By applying an input delay approach, the system was transformed into a continuous time-delay system. Attention was focused on the design of a robust guaranteed cost sampled-data control law which guarantees that the closed-loop system is asymptotically stable and the quadratic performance index is less than a certain bound for all admissible uncertainties. By applying Lyapunov stability theory, the theorems were derived to provide sufficient conditions for the existence of robust guaranteed cost sampled-data control law in the form of linear matrix inequalities (LMIs), especially an optimal state-feedback guaranteed cost sampled-data control law which ensures the minimization of the guaranteed cost was given. The effectiveness of the proposed method was illustrated by a simulation example with the asymptotically stable curves of system state under the initial condition of x(0)=[0.679 6 0].展开更多
文摘高比例可再生能源由于其不确定性等特点给电力系统的稳定运行带来了巨大挑战,因此更加快速稳定的电力系统调节能力需要多种灵活性资源的共同参与。为此,基于调度层面提出一种系统整体灵活性指标(Overall System Flexibility, OSF)。首先分析系统净负荷、机组、储能和联络线的灵活性特点并建立灵活性模型。提出一种基于能力要素的确定型指标,该指标能够将各部分资源作为一个整体来描述系统的灵活性。然后建立了考虑区域互联的电力系统调度模型并对指标进行计算。算例基于三区域IEEE RTS96系统,选取其中10个机组数据,从储能、联络线、备用容量等方面进行验证。计算出系统灵活性指标并对比分析,结果表明所提指标可以直观地反映系统的整体灵活性。
基金Project(12511109) supported by the Science and Technology Studies Foundation of Heilongjiang Educational Committee of 2011, China
文摘The robust guaranteed cost sampled-data control was studied for a class of uncertain nonlinear systems with time-varying delay. The parameter uncertainties are time-varying norm-bounded and appear in both the state and the input control matrices. By applying an input delay approach, the system was transformed into a continuous time-delay system. Attention was focused on the design of a robust guaranteed cost sampled-data control law which guarantees that the closed-loop system is asymptotically stable and the quadratic performance index is less than a certain bound for all admissible uncertainties. By applying Lyapunov stability theory, the theorems were derived to provide sufficient conditions for the existence of robust guaranteed cost sampled-data control law in the form of linear matrix inequalities (LMIs), especially an optimal state-feedback guaranteed cost sampled-data control law which ensures the minimization of the guaranteed cost was given. The effectiveness of the proposed method was illustrated by a simulation example with the asymptotically stable curves of system state under the initial condition of x(0)=[0.679 6 0].
