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PI passive control method and system of modular multilevel converter

A modular multi-level, passive control technology, applied in the direction of power transmission AC network, AC power input conversion to DC power output, electrical components, etc., can solve the problem of slow dynamic response, loss of stability, and weak robustness And other issues

Pending Publication Date: 2021-09-03
XI AN JIAOTONG UNIV
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Problems solved by technology

This control method is a kind of linear control. When the grid connection and weak grid or AC system fail, the system is likely to oscillate or even lose stability, and MMC itself is a complex nonlinear system with multiple variables and strong coupling. Therefore, the use of vector control has obvious limitations such as slow dynamic response, poor decoupling effect of active power and reactive power, and weak robustness.

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  • PI passive control method and system of modular multilevel converter
  • PI passive control method and system of modular multilevel converter
  • PI passive control method and system of modular multilevel converter

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Embodiment Construction

[0073] A PI passive control method of a modular multilevel converter of the present invention comprises the following steps:

[0074] S1, establish the bridge arm average model based on the controlled source and list the differential equation represented by Σ-Δ under its abc coordinate system;

[0075] S101. Establishing an average model of the MMC bridge arm based on a controlled source;

[0076] see figure 1 , MMC is composed of three phase units, each phase unit has two upper and lower bridge arms, and each bridge arm is composed of N sub-modules and a bridge arm reactor in series. Assuming that the capacitor voltages of all sub-modules on the same bridge arm of the MMC are equal and the three-phases operate in balance, an equivalent average model of the MMC bridge arm based on the controlled source is established according to the average model of the MMC based on the switching function model.

[0077] see figure 2 with image 3 , the cascaded sub-modules of each bridg...

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Abstract

The invention discloses a PI passive control method and system of a modular multilevel converter. The PI passive control method comprises the steps of: establishing a bridge arm average model based on a controlled source, and listing a differential equation represented by sigma-delta in a corresponding abc coordinate system; deducing a state space model of the MMC bridge arm average model according to the established differential equation; establishing a port controlled dissipation Hamilton model of an MMC system by using the state space model of the MMC bridge arm average model; utilizing the port controlled dissipation Hamilton model of the MMC system and utilizing a passive control theory to design a PI passive feedback controller of a closed-loop system, and realizing control over the modular multilevel converter through using the PI passive feedback controller. According to the PI passive control method, effective tracking of the expected trajectory of the MMC system can be realized, and the global asymptotic stability of the system can be ensured according to the Lyapunov stability theory, so that the robustness of the system is improved.

Description

technical field [0001] The invention belongs to the technical field of flexible direct current transmission, and in particular relates to a PI passive control method and system for a modular multilevel converter. Background technique [0002] Fossil energy represented by oil and coal is increasingly depleted, its use efficiency is low and it has caused huge pollution to the environment. Therefore, the development, utilization and connection of new energy sources to the grid are becoming more and more urgent. Flexible DC transmission technology can be used for small-capacity or large-capacity transmission of electric energy, and is more suitable for asynchronous interconnection between power grids in different regions. MMC can not only realize modular design, but also has the advantages of low loss, high waveform quality, and strong fault handling capability. Therefore, this topology is the mainstream topology of flexible DC transmission projects at present. [0003] Since t...

Claims

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Application Information

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IPC IPC(8): H02M7/483H02J3/36
CPCH02M7/483H02J3/36Y02E60/60
Inventor 赵月邹建龙
Owner XI AN JIAOTONG UNIV
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