Computation method capable of tracking Davinan equivalence parameter base on total differential equation

Abstract

The present invention provides a method which is used for calculating Thevenin equivalent parameters of power system. The active power and reactive power of a tidal current equation are respectively used for differentiating the Thevenin equivalent parameters so as to form a total differential equation system; the total differential equation system is solved with the Thevenin equivalent parameters as variables, so as to acquire the Thevenin equivalent parameters. The method overcomes the serious error in the existing calculating which assumes the invariable Thevenin equivalent parameters between two time steps, has the characteristics of strong adaptability, simple use and small amount of calculation, and can be used for analysis, calculation and on-site installation of the power system which requires a Thevenin equivalent system.

Description

technical field [0001] The invention relates to a Thevenin equivalent parameter tracking calculation method based on a total differential equation, which belongs to the field of power systems. Background technique [0002] In an actual power system, for any time section k at time k, the system can be viewed from a certain load bus to the system, and the system can be regarded as a two-node system in which a voltage source supplies power to the studied load bus through an impedance (that is, Thevenin equivalent ), as attached Figure 5 shown. Figure 5 middle, E k & and Z k are the potential and impedance of the external equivalent system at time k, respectively, and the load bus voltage at this time is V k & , the current is I k & , the load apparent power is As the operating state of the system changes, if it can be calculated in real time based on the real-time measured load bus voltage and injected current (or power) phasor value Figure 5 The potential E of the e...

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Problems solved by technology

This method can calculate the Thevenin equivalent two-node system parameters more accurately for the case where the interior of the Thevenin equivalent system at two operating points is unchanged and only the load on the load bus side changes; but for the internal change of the equivalent system , because the solution of the equation assumes that the parameters of the two operating points remain unchanged, which is inconsistent with the actual situation, the obtained parameters of the Thevenin equivalent two-node system have a very large error from the actual value, which cannot meet the requirements of further analysis

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