Patent application number | Description | Published |
20120046889 | METHOD OF SUBSTATION-CONTROL CENTER TWO-LEVEL DISTRIBUTED NONLINEAR STATE ESTIMATION FOR POWER SYSTEM - A substation-control center tow-level distributed grid nonlinear state estimation method is provided. The method comprises steps of: collecting RTU measurement data and PMU measurement data at each voltage level in each substation; performing a first three-phase state estimation to obtain a first estimation result, and removing bad data from the RTU measurement data and the PMU measurement data to estimate a state of a CB; forming a new CB island at each voltage level, and performing a second three-phase state estimation for the new CB island to obtain a final estimation result, in which the new CB island is a bus; processing the final estimation result to obtain ripe data; and collecting the ripe data and/or a part of the RTU measurement data and a part of the PMU measurement data and performing a whole grid state estimation. | 02-23-2012 |
20130166270 | METHOD OF SUBSTATION-CONTROL CENTER TWO-LEVEL DISTRIBUTED MODELING FOR POWER GRID - A method of substation-control center two-level distributed modeling for power grid is provided. The method comprises: (1) building a substation model for each of substations, each substation model comprising a network model having a topological structure of the substation devices, parameters of the substation devices and measurement information of each substation devices, and a wiring diagram of each substation based on a whole line identification consistency; (2) uploading each substation model for each of the substations to the control center through a state power dispatching data network; and (3) splicing network models for the substations according to the wiring diagrams of the substations to build a whole power grid model of a whole power grid so as to monitor and control the whole power grid. | 06-27-2013 |
20140046493 | STATIC SECURITY CONSTRAINED AUTOMATIC VOLTAGE CONTROL METHOD - A static security constrained automatic voltage control method is provided, which includes: performing a single automatic voltage control calculation for a control snapshot of a power system in each control cycle. The single automatic voltage control calculation comprises: obtaining a single-time severe contingency sequencing table and a periodical severe contingency sequencing table from a historical severe contingency information database, and selecting severe contingencies; performing a contingency assessment for the active contingency set, and iterating between a result of the contingency assessment for the active contingency set and a solution of the optimal power flow model to obtain a single automatic voltage control instruction; and performing a contingency assessment for a contingency set, and updating the single-time severe contingency sequencing table and the periodical severe contingency sequencing table according to a comprehensive result of the contingency assessment. | 02-13-2014 |
20140046501 | AUTOMATIC VOLTAGE CONTROL METHOD BASED ON COOPERATIVE GAME THEORY - A security and economy coordinated automatic voltage control method based on a cooperative game theory is provided. The method includes: establishing a multi-objective reactive voltage optimizing model of a power system; resolving the multi-objective reactive voltage optimizing model into an economy model and a security model; solving the economy model and the security model based on the cooperative game theory to obtain the automatic voltage control instruction; and performing an automatic voltage control for the power system according to the automatic voltage control instruction. | 02-13-2014 |
20140125280 | METHOD AND SYSTEM FOR CHARGING ELECTRIC VEHICLES IN AGGREGATION - Method and system for charging electric vehicles in an aggregation is provided. The method includes: obtaining a plurality of first charge power curves of a plurality of electric vehicles in the aggregation; obtaining a coordinating information of each of the plurality of electric vehicles from the plurality of first charge power curves; obtaining a first feedback charge power curve of each of the plurality of electric vehicles from the coordinating information and a charging cost curve of each of the plurality of electric vehicles; judging whether the first feedback charge power curve is same with the first charge power curve of each of the plurality of electric vehicles; if yes, charging each of the plurality of electric vehicles in accordance with the first charge power curve. | 05-08-2014 |
20140172298 | METHOD AND DEVICE FOR NAVIGATING ELECTRIC VEHICLE IN CHARGING - A method and a device for navigating an electric vehicle in charging are provided. The method comprises: S | 06-19-2014 |
20140222227 | METHOD FOR CALCULATING CONTINUATION POWER FLOW OF ELECTRIC POWER SYSTEM - A method for obtaining a continuous power flow of an electric power system is provided. The method comprises: establishing first power flow equations for PQ buses, and establishing second power flow equations for PV buses; establishing power flow equations according to the first flow equations, the second power flow equations, and a voltage magnitude and a voltage phase of a balance bus; choosing a bus having a fastest voltage drop as a parameterization bus, and defining a parameterization variable according to a voltage magnitude of the parameterization bus and the load growth factor; defining an equality constraint equation according to the parameterization variable, and generating an extended power flow equation according to the equality constraint equation and the power flow equations; solving the extended power flow equation by a plurality of iterations to obtain a plurality of load summations; generating a P-V curve according to the plurality of load summations. | 08-07-2014 |
20150088470 | METHOD AND DEVICE FOR IDENTIFYING FEASIBILITY OF TRANSMISSION INTERFACE CONSTRAINT IN ONLINE ROLLING DISPATCHING - A method and a device for identifying a feasibility of a transmission interface constraint in an online rolling dispatching are provided. The method comprises: S | 03-26-2015 |