Modeling method for performing dynamic characteristic research on hybrid alternating current/direct current (AC/DC) transmission system

Abstract

The invention discloses a modeling method for performing dynamic characteristic research on a hybrid alternating current / direct current (AC / DC) transmission system. The modeling method comprises the following steps of: constructing a main circuit and a control circuit of a DC transmission system in simulation software power system computer aided design (PSCAD); and connecting an equivalent AC system to the commutation bus position on the main circuit of the DC transmission system to form an integrated hybrid AC / DC system model. By the method, the dynamic characteristics of the hybrid AC / DC transmission system can be subjected to simulation research well; the DC system is modeled in detail; the AC system is subjected to equivalent treatment; and AC and DC are connected at the commutation bus position of the DC system, so that difficulty and workload of detailed modeling of the AC system are greatly reduced and accuracy of research is guaranteed.

Description

technical field [0001] The invention relates to a modeling method for researching the dynamic characteristics of a hybrid AC and DC system. Background technique [0002] The dynamic characteristics of DC transmission system have been the focus of DC engineering for a long time, 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 transmission 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 generator connected to the converter stati...

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;

Undoubtedly, RTDS simulation is closer to engineering reality, but its hardware investment is very large, and it is difficult for general operating units and schools to have experimental conditions

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