Patent ID: 9178386
Filing Date: 2015-11-03
Classification: G01R,H02J,Y02E,Y04S

Abstract:
1. A method for estimating a dynamic process of nodes without Phasor Measurement Unit (PMU) in real time in a power grid using only dynamic measurements of nodes with PMU and Supervisory Control And Data Acquisition (SCADA) measurement data or state estimation data, which is independent of grid parameters and renewal of state matrix, without relying on the estimated nodes to be observable when the estimated nodes and the nodes with PMU are in a same electric island, wherein the method uses recursive least square for locating a linear combination relationship between variances of measurement nodes without PMU and variances of measurement nodes with PMU from quasi-stable state data sequence during a period of time, including SCADA measurement data or state estimation data at a number of consecutive time points, and subsequently estimating the dynamic process of the node without PMU in real time based on the linear combination relationship, the method comprising steps: Step 1: selecting, by at least one processor of a wide area measurement system (WAMS) server in a control center for the power grid, nodes i without PMU and their physical quantities X Step 2: for each node i without PMU, selecting, by the at least one processor, a set of nodes with PMUs S Step 3: initializing, by the at least one processor, linear combination coefficients b Step 4: for each measurement X Step 5: according to the linear combination coefficient b where X j (t) is the measurement value from the node j with PMU at PMU sampling time t, and subsequently obtaining the estimated value of quantity X i of the node i without PMU at time t by the following formula: Step 6: when a new SCADA measurement data or state estimation data for time T