Modeling method for auxiliarypower load correction model based on measured data

Abstract

The invention discloses a modeling method of an auxiliary power load correction model based on measured data. The method is characterized by comprising the following steps of 1) determining a main auxiliary power medium-voltage load of a thermal power plant; 2) determining a relation between an important load and a working condition of a unit in a boiler system; 3) determining load characteristics of a medium-voltage auxiliary machine of a steam turbine system under different outputs of the unit; 4) proposing an auxiliary power static correction load model based on the auxiliary power load characteristics and simultaneously considering voltage and frequency static characteristics of an auxiliary power load; and 5) completing unknown parameters in the auxiliary power load correction model by applying a least square method on the basis of actual data of the power plant. The method has the beneficial effects that the relation between the auxiliary power load and the operation condition of the generator unit is researched on the basis of actual operation data of the power plant, the static correction model of the auxiliary power load is built according to the relation, and the deviation between a traditional auxiliary power load model result and actual data can be effectively solved; and the auxiliary power load correction model has certain reasonableness and very high precision and is of great significance to calculation of an actual power grid.

Description

technical field [0001] The invention belongs to the technical field of load modeling, and in particular relates to a modeling method of a power plant load correction model based on measured data. Background technique [0002] With the continuous expansion of the system scale and the emergence of new electrical equipment, the dynamic characteristics of the load become more and more complex. Adopting an optimistic or conservative load model will have adverse effects on grid security or economic operation. The 1996 blackout in North America was due to the fact that researchers adopted a relatively conservative load model, which led to overly optimistic simulation results, which led to a catastrophic accident that lost 30GW of load. The accuracy of the load model has an important impact on the calculation of short-circuit current, small disturbance, transient stability and voltage stability, as well as the DC dynamic characteristics of the power system. [0003] There are two ...

AI Technical Summary

Problems solved by technology

In the current research results, most commonly used load modeling methods only consider the relationship between the active power and reactive power of the load and the voltage and frequency of the system, ignoring other influencing factors of the load power

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