Quick correction decoupling power system state estimating method considering zero injection constraint

Abstract

The invention relates to a quick correction decoupling power system state estimating method considering zero injection constraint, belonging to the technical fields of power system scheduling automation and power system simulation. The quick correction decoupling power system state estimating method disclosed by the invention comprises the following steps of: establishing a least square state estimation model, carrying out iteration solution on the state estimation model according to regular quick decoupling estimation, correcting a node voltage amplitude and a phase angle of a nonzero injection node according to a correction quantity of the voltage amplitude and the phase angle figured out by a quick decoupling method in each iteration, and obtaining the node voltage amplitude and the phase angle of the zero injection node according to the relation between a zero injection node state variable and a nonzero injection node state variable determined according to a zero injection equality constraint, but not according to the calculation result of the quick decoupling estimation. According to the quick correction decoupling power system state estimating method considering zero injection constraint, disclosed by the invention, the whole calculation process is very similar to a traditional state estimation calculation procedure, is very convenient to realize; simultaneously, injection power of the zero injection node can be ensured to strictly be zero, and a state estimation result strictly meets a power flow equation.

Description

technical field [0001] The invention relates to a modified fast decoupling power system state estimation method considering zero injection constraints, 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 applicati...

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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