Zero-injection-constraint electric power system state estimation method based on modified Newton method

Abstract

The invention, which belongs to an electric power system scheduling automation and electric power system simulation technology field, relates to a zero-injection-constraint electric power system state estimation method based on a modified Newton method. The method is characterized by: establishing a state estimation model; carrying out an iterative solution to the state estimation model accordingto the common Newton method; in the each iteration, correcting a state variable of a nonzero injection node according to a calculation result of the common Newton method; however, acquiring the statevariable of the zero injection node by using a relationship between the zero injection node state variable established by the zero injection equality constraint and the nonzero injection node state variable and not by taking the calculation result of the common Newton method. A whole calculating process of the invention is similar to a traditional state estimation calculating flow. Realization is convenient. Simultaneously, an injection power of the zero injection node can be guaranteed to be zero. The state estimation result strictly satisfies a trend equation.

Description

technical field [0001] The invention relates to a power state estimation method with zero injection constraints based on a modified Newton method, and belongs to the technical fields of power system scheduling automation and power system simulation. Background technique [0002] Power system state estimation is the key basic module of power system energy management system. In an actual power system, there are many zero-injection nodes that are neither connected to generators nor connected to loads. In the calculation results of power system state estimation, the node injection power of these zero-injection nodes should be strictly 0, otherwise, the calculation results of power system state estimation will not strictly satisfy the power flow equation, which will cause the calculation results of power system state estimation to be different from The calculation results of the dispatcher's power flow are biased, which brings great inconvenience to other advanced applications o...

AI Technical Summary

Problems solved by technology

This is an approximate method, and the injection power of the zero-injection node cannot be strictly 0

In fact, the problem of large injection power of zero-injection nodes at home and abroad is quite serious at present. It is very important to study a simple and efficient power system state estimation solution method that can ensure that the injection power of zero-injection nodes is strictly 0.

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