Abstract: A polymer having a dispersing function, a preparation method therefor and use thereof as a cement dispersant are provided. The polymer has a structural unit (a), a structural unit (b) and a structural unit (c). The structural unit (a) is provided by an unsaturated polyether, the structural unit (b) is provided by an unsaturated acid and/or a salt thereof and/or an anhydride thereof, and the structural unit (c) is provided by a silane and/or siloxane having a polymerizable group and no less than five carbon atoms. The molar ratio of the structural unit (a), the structural unit (b) and the structural unit (c) is 1:(1-20):(0.01-0.5); and the polymer has a weight average molecular weight of 20,000-90,000 g/mol.

Abstract: A polymer having a dispersing function, a preparation method therefor, and a use thereof as a cement dispersant are provided. The polymer has a structural unit a, a structural unit b, a structural unit c and a structural unit d. The structural unit a is provided by an unsaturated polyether and/or polyester, the structural unit b is provided by an unsaturated carboxylic acid or an anhydride or salt thereof, the structural unit c is provided by a silane and/or siloxane containing a polymerizable group, and the structural unit d is provided by an unsaturated sulfonic acid or a salt thereof. The molar ratio of the structural unit a to the structural unit d is 1:(5-15) and the polymer has a weight average molecular weight of 20,000 to 120,000. The polymer can be used as an oil well cement dispersant.

Abstract: A method for estimating an admittance matrix for a transmission network comprises estimating in an upper layer time-series data for hidden nodes in the transmission network, computing in a lower layer an estimated admittance matrix for the transmission network and iteratively exchanging information between the upper layer and the second lower layer to produce a final admittance matrix for the transmission matrix. In some embodiments, the method may further comprise spatially dividing the transmission network into a plurality of subnets in the upper layer and estimating the time-series data for the hidden nodes for each subnet. Estimating the times series data for the hidden nodes for each subnet in parallel.

Abstract: A method of estimating grid admittance is provided and includes receiving an input of a network topology of a distribution grid, categorizing nodes of the network topology of the distribution grid into node-cases, for each node-case, executing a network admittance estimation algorithm from available measurement information and determining a network admittance estimate for the distribution grid with the network topology from results of the network admittance estimation algorithm executed for each node-case.

Abstract: Described are concepts, systems and methods for operating microgrid systems both during normal operation conditions and during sudden, unexpected occurrences of a fault which results in a source becoming disconnected from a primary supply. This is achieved through control systems and method based upon multi-layered modeling of system controllable components and their interactions. This approach results in controllable components capable of operation in a “plug-and-play” manner.

Abstract: A method for estimating an admittance matrix for a transmission network comprises estimating in an upper layer time-series data for hidden nodes in the transmission network, computing in a lower layer an estimated admittance matrix for the transmission network and iteratively exchanging information between the upper layer and the second lower layer to produce a final admittance matrix for the transmission matrix. In some embodiments, the method may further comprise spatially dividing the transmission network into a plurality of subnets in the upper layer and estimating the time-series data for the hidden nodes for each subnet. Estimating the times series data for the hidden nodes for each subnet in parallel.

Abstract: Described are concepts, systems and methods for operating microgrid systems both during normal operation conditions and during sudden, unexpected occurrences of a fault which results in a source becoming disconnected from a primary supply. This is achieved through control systems and method based upon multi-layered modeling of system controllable components and their interactions. This approach results in controllable components capable of operation in a “plug-and-play” manner.