Power system multi-zone distributed state estimation method based on synchronous phase angle measurement device

Abstract

The invention discloses a power system multi-zone distributed state estimation method based on a synchronous phase angle measurement device, which quickly estimates voltage amplitude values and phase angle values of all nodes of a power grid in real time by utilizing measurement data from a SCADA (supervisory control and data acquisition) system and a PMU (phasor measurement unit), and performs real-time interaction on state information of all zones. According to the method, a geographical characteristic-based non-overlapping decoupling strategy is adopted to decouple a large power system into subsystems, and states of all the subsystems are integrated by a coordination system; and with adoption of the multi-zone distributed state estimation method, estimation of states of the large system turns into estimation of states of a series of partial small zones, so that the computation speed is greatly improved. Real-time accurate measurement information of voltage, phase angle and the like can be offered to the system, and the system is enabled to obtain higher measurement redundancy, so that the accuracy of state estimation can be improved. According to the method, zone interaction management facilitates secure and effective access of new energy, so the development requirement of a future intelligent power grid can be met.

Description

technical field [0001] The invention belongs to the technical field of power system operation and control, and in particular relates to a multi-region distributed state estimation method of a power system based on a synchronous phase angle measurement device (PMU). Background technique [0002] The power system state estimation is the foundation and core of the power grid energy management system (EMS). Its function is to filter the real-time information provided by the data acquisition and monitoring system (SCADA) to improve the data accuracy and eliminate the interference of wrong information, so as to obtain a High-quality real-time database. With the continuous expansion of the scale of the interconnected grid, the complexity of the grid operation in space, time, and control objectives is increasing, and the traditional EMS dispatch control of the grid lacks good coordination in these three aspects. The power outage in the United States and Canada that shocked the worl...

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Problems solved by technology

[0003] At present, the measurement data of power system state estimation mainly comes from the SCADA system, generally including node injection power, branch power and node voltage amplitude, etc. These data are transmitted every 2 seconds, but because the measurement information of these systems is often It is transmitted to the dispatching center through the telecontrol device, and the error of the telecontrol device and the errors of each link in the transmission process make it difficult to guarantee the accuracy of the state variables such as voltage and phase angle obtained by iterative solution

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