New energy bearing capacity early-warning method based on online inertia estimation of power system

Abstract

The invention belongs to the technical field of new energy bearing capacity analysis, and particularly relates to a new energy bearing capacity early-warning method based on the online inertia estimation of a power system. The method comprises the following steps: 1, analyzing a system frequency response characteristic curve, and determining key parameters for determining the system frequency change; 2, obtaining the ultimate moment of inertia of the system under the maximum disturbance through simulation according to the constraint condition of system frequency change; 3, evaluating the new energy bearing capacity by comparing the rotational inertia obtained by the online estimation of the system with the ultimate rotational inertia. According to the invention, the method can give the newenergy bearing capacity of the system in real time according to the operation condition of the system, which is of important significance to ensure effective utilization of new energy and safe and stable operation of the system. Under the condition that the new energy permeability in the power system is large, when the power of the system is unbalanced, the frequency instability of the system canbe judged in time by analyzing the frequency change rate and the frequency offset, and early warning is given out.

Description

technical field [0001] The invention belongs to the technical field of new energy carrying capacity analysis, and in particular relates to an early warning method for new energy carrying capacity based on online inertia estimation of a power system. Background technique [0002] At present, the research on the new energy carrying capacity of the power system is usually based on the data of the whole network, using BPA, PSASP and other software to calculate, and evaluate the new energy carrying capacity of the system from the aspects of frequency stability, voltage stability, and transient stability. These methods The carrying capacity of new energy is obtained through offline calculation. However, there is still a gap in the research on the method of real-time evaluation of new energy carrying capacity based on the actual operating status of the system. If the current new energy carrying capacity of the system can be evaluated according to the operation of the system, it is...

AI Technical Summary

Problems solved by technology

With the increase of the new energy penetration rate, the generating power of the synchronous generator is squeezed, and the moment of inertia of the system is reduced. When there is an unbalanced power in the system, the frequency characteristics of the system will deteriorate, and the frequency fluctuation will also increase.

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