2results about How to "Sparse" patented technology

The application provides a reduced-order unified modeling method, system, computer program product and device for electromagnetic small disturbances of a new energy system and a computer readable storage medium, and belongs to the technical field of new energy system modeling. D Q The application establishes a power network differential equation set in the electromagnetic scale under the common D Q coordinate system; a full system state space model is constructed; independent state variables and redundant state variables are identified through a method of traversing system nodes, differential and algebraic equation sets in the full system state space model are separated, a differential equation corresponding to the independent state variables of the system is constructed; based on the differential equation of the independent state variables, a full system differential-algebraic equation is obtained, and the full system differential-algebraic equation is further eliminated to obtain an ODE form of the full system state space model containing only the independent state variables, thereby laying a foundation for stability analysis of a large-scale new energy power system.​​

The invention discloses an incoherent authorization-free communication method, device and system for dual-mode information grouping, and belongs to the field of wireless communication, and the method comprises the following steps: incoherent information modulation: a signal transmitting end determines the information transmission mode of each group in a data frame, the position of an active information transmission block and the pilot frequency selected by the active block according to system configuration information and a bit to be transmitted, the information transmission mode comprises a high-low density transmission mode and a low-density transmission mode, and the number of active data blocks in groups in the high-density transmission mode is large; energy estimation: the receiving end estimates the energy of the transmitted signal by adopting a block coordinate descent algorithm based on pruning operation; active sending end detection: setting an adaptive quantity threshold value based on an energy estimation vector estimation result, and determining an active sending end according to an energy threshold value and the number of active data blocks; and information bit recovery: carrying out information bit recovery on the active sending end according to the estimation result of the energy estimation vector and the configuration information. According to the invention, the transmission rate can be improved without increasing pilot frequency resources.