With the development of power electronics-based units such as battery storage systems(BSS)and voltage source converters(VSC)that can quickly respond,the power system will receive a lot of security benefits from these ...With the development of power electronics-based units such as battery storage systems(BSS)and voltage source converters(VSC)that can quickly respond,the power system will receive a lot of security benefits from these fast control units.To fully utilize fast correction controls from the BSS and grid coupling VSC(GCVSC),this paper presents a new N-1 security-constrained stochastic unit commitment(SUC)model for hybrid AC and DC grids.In the proposed model,those fast-control units are used to avoid overloading and voltage violations in the post-contingency short-term period.In order to maintain good voltage profiles during pre-and post-contingency periods,the reactive power support ability of the BSS and the GCVSC is also considered.To improve calculation speed,the Bilinear Benders decomposition-based method is used to solve the proposed SUC model.Results on two examples,hybrid AC and DC grids,show that the proposed method can provide highly effective unit commitment solutions with post-contingency corrective actions,especially suitable for avoiding post-contingency short-term security problems in day-ahead dispatch.展开更多
The Five-hundred-meter Aperture Spherical radio Telescope （FAST） adopts an active deformable main reflector which is composed of 4450 triangular panels. During an observation, the illuminated area of the reflector i...The Five-hundred-meter Aperture Spherical radio Telescope （FAST） adopts an active deformable main reflector which is composed of 4450 triangular panels. During an observation, the illuminated area of the reflector is deformed into a 300-m diameter paraboloid and directed toward a source. To achieve accurate control of the reflector shape, positions of 2226 nodes distributed around the entire reflector must be measured with sufficient precision within a limited time, which is a challenging task because of the large scale. Measurement of the FAST reflector makes use of stations and node targets. However, in this case the effect of the atmosphere on measurement accuracy is a significant issue. This paper investigates a differen- tial correction method for total stations measurement of the FAST reflector. A multi-benchmark differential correction method, including a scheme for benchmark selection and weight assignment, is proposed. On- site evaluation experiments show there is an improvement of 70%-80% in measurement accuracy compared with the uncorrected measurement, verifying the effectiveness of the proposed method.展开更多
基金supported by National Natural Science Foundation of China under Grant 51707059.
文摘With the development of power electronics-based units such as battery storage systems(BSS)and voltage source converters(VSC)that can quickly respond,the power system will receive a lot of security benefits from these fast control units.To fully utilize fast correction controls from the BSS and grid coupling VSC(GCVSC),this paper presents a new N-1 security-constrained stochastic unit commitment(SUC)model for hybrid AC and DC grids.In the proposed model,those fast-control units are used to avoid overloading and voltage violations in the post-contingency short-term period.In order to maintain good voltage profiles during pre-and post-contingency periods,the reactive power support ability of the BSS and the GCVSC is also considered.To improve calculation speed,the Bilinear Benders decomposition-based method is used to solve the proposed SUC model.Results on two examples,hybrid AC and DC grids,show that the proposed method can provide highly effective unit commitment solutions with post-contingency corrective actions,especially suitable for avoiding post-contingency short-term security problems in day-ahead dispatch.
基金supported by the Project Research of Adaptive Modeling and Control Strategy in the FAST Active Reflector of the National Natural Science Foundation of China(Grant No.11273001)the Key Laboratory of Radio Astronomy,Chinese Academy of Sciences
文摘The Five-hundred-meter Aperture Spherical radio Telescope （FAST） adopts an active deformable main reflector which is composed of 4450 triangular panels. During an observation, the illuminated area of the reflector is deformed into a 300-m diameter paraboloid and directed toward a source. To achieve accurate control of the reflector shape, positions of 2226 nodes distributed around the entire reflector must be measured with sufficient precision within a limited time, which is a challenging task because of the large scale. Measurement of the FAST reflector makes use of stations and node targets. However, in this case the effect of the atmosphere on measurement accuracy is a significant issue. This paper investigates a differen- tial correction method for total stations measurement of the FAST reflector. A multi-benchmark differential correction method, including a scheme for benchmark selection and weight assignment, is proposed. On- site evaluation experiments show there is an improvement of 70%-80% in measurement accuracy compared with the uncorrected measurement, verifying the effectiveness of the proposed method.
