Discrete-state-space-based small-signal stability analysis method for medium-voltage direct-current system

Abstract

The invention discloses a small signal stability analysis method for a medium-voltage direct-current system based on a discrete state space, and belongs to the field of electrical engineering. The method comprises the following steps: deducing and establishing discrete state space models and discrete equivalent circuit models of direct current network elements and alternating current equipment elements in a system; constructing a discrete state space model and a discrete circuit network of the whole system according to the discrete equivalent circuit of each element and the topological structure of the system, and eliminating an intermediate variable of a state space equation based on the discrete circuit network to obtain a discrete state matrix; and according to the discrete state matrix of the system, solving a full-dimensional discrete characteristic value of the medium-voltage direct-current power system so as to analyze the small signal stability of the system. The method is clear in physical significance, programming is easy to achieve, compared with a traditional continuous state space analysis method, the topological structure of the system can be reserved, a calculation program is easy to modify when the topological structure of the system is changed, and the method is quite suitable for the medium-voltage direct-current power system with high reconfigurability.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering, and more particularly relates to a small-signal stability analysis method of a medium-voltage direct current system based on a discrete state space. Background technique [0002] With the development of ship modernization, ship integrated electric propulsion has gradually become the mainstream propulsion method of ships. In addition to the advantages of the ship's integrated electric propulsion system itself, the ship's integrated electric propulsion system using medium-voltage DC power distribution also has potential advantages such as improving the power density of the system, saving space, and improving the efficiency of the system. Promote the future development trend of the system. [0003] There are a large number of constant power loads powered by power electronic converters in the ship's medium-voltage DC integrated power system, and the most typical one is the propulsion ...

AI Technical Summary

Problems solved by technology

However, the ship's medium-voltage DC integrated power system is composed of DC components and belongs to the DC system, which is quite different from the AC system in the literature. Therefore, the discrete eigenvalue analysis model for the AC system is not suitable for the analysis of the ship's medium-voltage DC integrated power system. System Stability Issues

[0006] In order to solve the limitations of the above-mentioned traditional continuous state space method in the medium voltage DC integrated power system

Images