Static voltage stability index calculation method for integrated energy system

Abstract

The invention discloses a static voltage stability index calculation method for an integrated energy system. The method comprises the following steps: reading system parameters, and building a unified power flow model of the integrated energy system; calculating the power flow by adopting a Newton-Raphson method, and obtaining a system power flow state and a unified Jacobian matrix; calculating an L index according to the power grid model parameters and the current power flow state; partitioning the unified Jacobian matrix according to the subsystem type and the variable type, constructing a reduced order Jacobian matrix related to the reactive power and voltage relationship, and further calculating the minimum eigenvalue index of the reduced order Jacobian matrix; performing standardization processing on the L index and the minimum characteristic value index; and weighting the two indexes after standardization processing to obtain a comprehensive voltage stability index. The node voltage stability and the overall stability margin of the system are comprehensively considered, the calculation method is simple, the voltage stability of the integrated energy system can be effectively and comprehensively evaluated, and guidance is provided for monitoring and controlling the static voltage stability of the system.

Description

technical field [0001] The invention relates to the technical field of stability analysis of an integrated energy system, in particular to a method for calculating a static voltage stability index for an integrated energy system. Background technique [0002] With the increasing energy depletion and environmental pollution, a variety of new energy production and consumption methods are emerging. In recent years, research on key technologies of comprehensive energy systems integrating electricity, gas, heat and other energy carriers has become a new focus of the energy revolution. At present, domestic and foreign scholars' research on integrated energy systems mainly focuses on modeling, planning, and operation optimization, and less research on stability. [0003] With the rapid development of the economy and the improvement of people's living standards, the demand for various loads such as electricity, gas, heat, and cooling has increased sharply, which has brought enormou...

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Problems solved by technology

Among them, the calculation of the load margin index is cumbersome, and the growth mode of the load needs to be specified; the sensitivity index reflects the voltage stability through a differential relationship, and can only evaluate the influence relationship between two variables; the eigenvalue or singular value based on the Jacobian matrix The value index can only quantitatively evaluate the weakest mode of the system, and cannot reflect the voltage stability of the nodes; the L index reflects the voltage situation of each node in the system, and the evaluation result is relatively conservative

Therefore, it is impossible to accurately evaluate the voltage stability of the integrated energy system by using the static voltage stability index of the traditional power system.

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