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Dual-stage backstepping control method for multi-level converter

A reverse thrust control and converter technology, applied in the direction of converting AC power input to DC power output, electrical components, flexible AC transmission systems, etc., can solve complex reverse thrust control methods, limited applications, technical difficulties in reverse thrust control, etc. problem, to achieve good control effect, ensure stability, and excellent dynamic response performance

Active Publication Date: 2022-04-15
TIANJIN UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, this backstepping control method is complex, and its application is limited to scenarios with AC filter inductance
The above limitations have brought technical difficulties to the application of reverse thrust control

Method used

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  • Dual-stage backstepping control method for multi-level converter
  • Dual-stage backstepping control method for multi-level converter
  • Dual-stage backstepping control method for multi-level converter

Examples

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Embodiment 2

[0054] Step 201: Obtain the control target of the MMC-STATCOM system;

[0055] in, figure 1It is a STATCOM topology based on a three-phase MMC, and the present invention is mainly aimed at a double star half bridge (Double Star Chopper Cell, DSCC) MMC structure. For the DSCC structure, there are three phase bridge arms in the MMC converter, and each phase bridge arm includes an upper arm and a lower arm. Each arm includes N half-bridge sub-modules and a bridge arm inductance (equivalent inductance L arm and equivalent resistance R arm ). The coupling point between the upper arm and the lower arm is connected to the AC grid through the filter inductor (equivalent inductance L and equivalent resistance R). Each switch module has four semiconductor switches (S 1 ,S 2 ,D 1 , and D 2 ) and a capacitor (C). The switching of sub-modules can be realized by controlling the on and off of the switching period. If the sub-module is connected, the voltage at its output terminal i...

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Abstract

The invention discloses a dual-stage backstepping control method for a multi-level converter, and the method comprises the steps: firstly, determining a control target through a static synchronous reactive power compensation (STATCOM) system model of a modular multi-level converter (MMC) based on a double-star half-bridge (DSCC), and carrying out the reverse stepping control of the dual-stage backstepping control of the MMC based on the STATCOM system model of the MMC based on the double-star half-bridge DSCC, the reverse stepping control of the dual-stage backstepping control of the MMC based on the dual-star half-bridge DSCC, the reverse stepping control of the dual-stage backstepping control of the MMC, and the reverse stepping control of the dual-stage backstepping control of the MMC based on the dual-star half-bridge DSCC. Secondly, based on backstepping control, a double-layer control method of the MMC-STATCOM system is formulated (first layer: capacitor total energy and output reactive power control; a second layer: circulation control); then, through Lyapunov stability analysis, backstepping controller parameters are designed, and the stability of the proposed method is verified theoretically; and finally, through a three-phase MMC-STATCOM experimental prototype, the control effect of the proposed method is explored from four aspects of dynamic response under reactive power step, control results under different control parameters, dynamic response under power grid voltage imbalance and method robustness under circuit parameter change, and the effectiveness of the proposed method is verified. It is proved that stable operation of the MMC-STATCOM system can be guaranteed.

Description

technical field [0001] The invention relates to a multilevel converter and its application in the field of microgrid, in particular to a two-stage backstepping control method for a multilevel converter. Background technique [0002] Modular Multilevel Converter (MMC) is not only used in inverters and grid-connected converters, but also in the field of Static Synchronous Compensator (STATCOM) in recent years. focus on. When MMC is applied to reactive power compensation application scenarios, its DC side usually lacks the support of DC voltage, which is quite different from traditional MMC grid-connected converters in terms of circulating current control. In the MMC static synchronous reactive power compensation equipment, the energy of the sub-module capacitor voltage cannot be charged and discharged through the common DC side, and is usually directly adjusted through the active power measured by the AC. [0003] In addition, for the current control method of the modular mu...

Claims

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Application Information

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IPC IPC(8): H02J3/18H02M7/483
CPCY02E40/10
Inventor 肖迁贾宏杰穆云飞徐洋余晓丹
Owner TIANJIN UNIV
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