Grid observability analysis method for simultaneous phasor measurement

Abstract

The invention discloses a grid observability analysis method for synchronous phasor measurement. The method includes the following steps that: step 1, the measurement islands of the initial synchronous phasor measurement of an entire power network are formed by means of PMU current phasor measurement; step 2, a PMU zero-injection measurement boundary node adjacency list is formed, the measurementislands are initially merged through the boundary node adjacency list according to synchronous phasor measurement topology merging rules; step 3, to-be-merged grids are formed, PMU measurement islandsassociated with qualified to-be-merged grids are merged according to to-be-merged grid merging rules, and observable PMU measurement islands are determined after the completion of the merging; step 4, as for to-be-merged grids which do not satisfy the to-be-merged grid merging rules, a numerical value method is adopted to search missed observable islands; and step 5, the observability of the network is judged, all observable islands constitute an observable area, if the area covers the entire network, the whole network is observable, otherwise, the whole network is unobservable, and the observable area is outputted.

Description

technical field [0001] The invention relates to the technical field of power system operation and control, in particular to a grid observability analysis method for synchronized phasor measurement in power system state estimation. Background technique [0002] Monitoring the operating status of the system is very important to the safe operation of the power system. The power grid wide-area monitoring system is based on synchrophasor measurement technology, and has technical characteristics such as high-precision synchrophasor measurement in different places, high-speed communication and fast response. It is very suitable for real-time monitoring of the dynamic process of my country's large-span interconnected power grid. The application of power grid wide-area monitoring system will further improve the energy management performance of power system, especially the performance of state estimation. However, due to economic and technical factors, it is not possible to configure...

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Problems solved by technology

[0005] 2. The phasor measurement provided by the PMU is based on the synchronous clock provided by the GPS. In the analysis process, the reference point cannot be arbitrarily designated like the data acquisition and monitoring control system

However, this method is proposed for SCADA systems and cannot be directly used to analyze systems equipped with PMUs

In addition, the improvement measures for the missed judgment of the topology method in Document 5 are too complicated, which is not conducive to the practical application of the algorithm

[0011] Therefore, it is hoped to have a grid observability analysis method for synchronized phasor measurement to solve the problems of traditional wind power point prediction and non-parametric estimation methods in the prior art

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