Modular multilevel converter (MMC) contained direct current power transmission system's current oscillation suppression damping control method

A DC transmission system, damping control technology, applied to AC network circuits, reducing/preventing power oscillation, electrical components, etc., can solve the problem of affecting normal operation, increasing system transmission loss, shortening the service life of converter stations and DC equipment, etc. problems, to achieve the effect of easy engineering implementation, providing stability and strong stability

Pending Publication Date: 2017-05-31
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the control system cannot provide the required damping, the continuous resonant oscillation of the DC current will increase the transmission loss of the system and shorten the service life of the

Method used

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  • Modular multilevel converter (MMC) contained direct current power transmission system's current oscillation suppression damping control method
  • Modular multilevel converter (MMC) contained direct current power transmission system's current oscillation suppression damping control method
  • Modular multilevel converter (MMC) contained direct current power transmission system's current oscillation suppression damping control method

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Embodiment Construction

[0031] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings. The steps required for the control method of DC current oscillation suppression and damping proposed by the present invention are as follows:

[0032] 1) Establish a simplified equivalent model of MMC

[0033] figure 1 is a modular multilevel converter (MMC) topology, if its internal characteristics are ignored and only the external characteristics are considered, then the MMC can be simplified and equivalent to figure 2 The structure shown, where i d Indicates the current output by the controlled current source, i dc Indicates the MMC DC current, u dc is the MMC DC voltage, u ceq is the average voltage of the input sub-module, C eq is the equivalent capacitance of MMC, p c is the active power injected into MMC, L s and R s is the equivalent inductance and equivalent resistance of the bridge arm reactor, so that the electromagnetic transient equat...

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Abstract

The invention provides a modular multilevel converter (MMC) contained direct current power transmission system's current oscillation suppression damping control method, comprising the following steps: creating an MMC simplified and equivalent model; selecting a damping controller structure; determining the final expression form of the damping controller and configuring the parameters for the damping controller; based on the final expression form of the damping controller and the direct current of the outlet of the current converter, obtaining the damping compensation voltage; transmitting the damping compensation voltage to a current converter valve based controller and obtaining the corrected bridge arm reference voltage of the MMC so as to realize the suppression on the current oscillation components. According to the technical schemes of the invention, it is possible to effectively suppress the oscillation phenomenon of an MMC type direct current power transmission system and the insecurity of the system.

Description

technical field [0001] The invention relates to the field of direct current transmission, in particular to a damping control method for current oscillation suppression of a direct current transmission system including MMC. Background technique [0002] High voltage direct current (HVDC) transmission technology based on voltage source converter (voltage source converter, VSC) has developed rapidly due to its independent controllability of active power and reactive power. It is of great significance in the reception, transmission and consumption of renewable energy. VSC-HVDC has two-level or three-level and modular multi-level topologies, among which the topology with modular multi-level converters is the most widely used in the field of direct current transmission. [0003] The HVDC system containing MMC has capacitors, smoothing reactors, and DC lines in the DC field, so the DC system has low- and medium-frequency resonance frequency points related to the main circuit param...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02J3/24
CPCH02J3/24H02J3/36H02J2003/365Y02E60/60
Inventor 李云丰吴亚楠杨杰孔明贺之渊汤广福
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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