Modeling method and system for correcting and predicting arc extinguishing angle

Abstract

The invention discloses a modeling method and a system for correcting and predicting an arc extinguishing angle. The modeling method includes the following steps: firstly constructing a main circuit of a direct current system in simulation software power system computer aided design / electromagnetic transients including DC (PSCAD / EMTDC), and establishing a control model in an inversion side control circuit by adopting the modeling method for correcting and predicting the arc extinguishing angle. The modeling method is verified by adopting a yingdong +-660kV direct current system model, and results show correctness of the modeling method. The modeling method and the system for correcting and predicting the arc extinguishing angle can solve the problem that the arc extinguishing angle cannot be measured actually, and guarantees that an inversion side control curve is a positive slope curve. The modeling method is simple and practical, can well simulate and study dynamic property service of the direct current system, and is an essential condition for detailed modeling of the direct current system which cannot measure the arc extinguishing angle actually.

Description

technical field [0001] The invention relates to a method and system for predicting arc extinction angle. In particular, it relates to a modeling method and system for correcting and predicting arc extinction angle. Background technique [0002] The dynamic characteristics of DC systems have long been the focus of DC engineering, and with the increasing scale of DC projects and the higher and higher DC transmission capacity, its importance has become increasingly prominent. The content of the analysis of DC dynamic characteristics is extremely extensive, and all studies on the DC side can be included, and each aspect of it deserves to be studied in detail individually. According to the structure of the DC system, from the perspective of the system, the research directions related to the electromagnetic transient process can be summarized as follows: [0003] 1. The subsynchronous resonance problem caused by DC transmission; [0004] 2. The self-excitation problem of the ge...

AI Technical Summary

Problems solved by technology

[0003] 1. The subsynchronous resonance problem caused by DC transmission;

[0004] 2. The self-excitation problem of the generator connected to the converter station;

[0006] 4. The response of the DC system under different AC system strengths and different AC side faults;

[0007] 5. Transformer saturation and magnetic bias problems;

[0008] 6. The ferromagnetic resonance problem of the converter transformer;

[0009] 7. Harmonics and low-order resonance problems caused by DC transmission;

However, there are also some DC systems (such as Yindong ±660kV DC system) because the converter valve and the control system are not produced by the same unit, and there is a certain degree of mismatch, which makes it impossible to measure the arc-extinguishing angle, which makes it difficult to use fixed arc-extinguishing angle control , while the AC system on the inverter side is relatively stable, and the effect of constant voltage control is not good, so a new control method is needed, which is the predictive arc-extinguishing angle control method, but the control curve of the arc-extinguishing angle on the inverter side is not It must be a positive slope, which is not conducive to the stability of the system

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