The region-wise approach is a new method that is quite different from the point-wise approach widely used at present in power system analysis. The investigation of security regions will lead to a new methodology on po...The region-wise approach is a new method that is quite different from the point-wise approach widely used at present in power system analysis. The investigation of security regions will lead to a new methodology on power system planning and dispatch. Using the liaearized load flow model, which regards bus voltage magnitudes and branch angles as state variables, and some properties of affine mapping, some geometric descriptions of active power steady-state security regions are presented. Approximate hypercuboid(HC) security regions, i.e. "global regions" and "response regions" with losses taken into consideration, are briefly described. An expanding algorithm to construct such HCs is recommended and justified with an illustrative example network. The region-wise approach has made advances towards the practical application by using the global region in cooperation with the reponse region.展开更多
This paper develops a novel model and an algorithm of security region based real and reactive power pricing of power systems.In the proposed model,the reactive power production cost is represented as the opportunity c...This paper develops a novel model and an algorithm of security region based real and reactive power pricing of power systems.In the proposed model,the reactive power production cost is represented as the opportunity cost.The static voltage stability region in the cut set power space(CVSR) and the practical dynamic security region(PDSR) in the injection power space are used to represent the constraints of voltage stability and transient stability,so that the consideration of this kind of constraints in the optimization becomes very easy.In the proposed algorithm,a decoupled optimization and iteration method of active power production cost and reactive power production cost is suggested.According to the K-T optimality conditions,the prices of active power and reactive power,and the different components corresponding to the concerned security constraints are derived.The components of spot prices can reflect the influence of different node power injections on each kind of security constraints,so that through the node price all of the participants in power market can be stimulated to take an active part in maintaining the system security.An illustrative example on the New England 10-genetator 39-bus System is used to demonstrate the proposed method.展开更多
动态安全域(DSR)的暂态稳定边界可以近似表示为超平面,由此提出了一种DSR的快速求解方法。该方法分别对事故前系统的稳定运行点、事故中系统的故障轨迹和事故后系统的暂态稳定性进行有功功率的小扰动分析,然后依据整个暂态响应过程中状...动态安全域(DSR)的暂态稳定边界可以近似表示为超平面,由此提出了一种DSR的快速求解方法。该方法分别对事故前系统的稳定运行点、事故中系统的故障轨迹和事故后系统的暂态稳定性进行有功功率的小扰动分析,然后依据整个暂态响应过程中状态变量的连续性,将不同阶段的分析结果联系起来,最终推导出了超平面形式的DSR解析表达式。应用暂态能量函数分析给出了注入空间上的实用动态安全判据,以此来量化暂态稳定性指标,从而实现对事故后系统的有功功率小扰动分析。该方法的有效性在New England 10机39节点系统上得到了验证。展开更多
文摘The region-wise approach is a new method that is quite different from the point-wise approach widely used at present in power system analysis. The investigation of security regions will lead to a new methodology on power system planning and dispatch. Using the liaearized load flow model, which regards bus voltage magnitudes and branch angles as state variables, and some properties of affine mapping, some geometric descriptions of active power steady-state security regions are presented. Approximate hypercuboid(HC) security regions, i.e. "global regions" and "response regions" with losses taken into consideration, are briefly described. An expanding algorithm to construct such HCs is recommended and justified with an illustrative example network. The region-wise approach has made advances towards the practical application by using the global region in cooperation with the reponse region.
基金the key research project of the National Natural Science Foundation of China(Grant No.50595413)
文摘This paper develops a novel model and an algorithm of security region based real and reactive power pricing of power systems.In the proposed model,the reactive power production cost is represented as the opportunity cost.The static voltage stability region in the cut set power space(CVSR) and the practical dynamic security region(PDSR) in the injection power space are used to represent the constraints of voltage stability and transient stability,so that the consideration of this kind of constraints in the optimization becomes very easy.In the proposed algorithm,a decoupled optimization and iteration method of active power production cost and reactive power production cost is suggested.According to the K-T optimality conditions,the prices of active power and reactive power,and the different components corresponding to the concerned security constraints are derived.The components of spot prices can reflect the influence of different node power injections on each kind of security constraints,so that through the node price all of the participants in power market can be stimulated to take an active part in maintaining the system security.An illustrative example on the New England 10-genetator 39-bus System is used to demonstrate the proposed method.
文摘动态安全域(DSR)的暂态稳定边界可以近似表示为超平面,由此提出了一种DSR的快速求解方法。该方法分别对事故前系统的稳定运行点、事故中系统的故障轨迹和事故后系统的暂态稳定性进行有功功率的小扰动分析,然后依据整个暂态响应过程中状态变量的连续性,将不同阶段的分析结果联系起来,最终推导出了超平面形式的DSR解析表达式。应用暂态能量函数分析给出了注入空间上的实用动态安全判据,以此来量化暂态稳定性指标,从而实现对事故后系统的有功功率小扰动分析。该方法的有效性在New England 10机39节点系统上得到了验证。
