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MMC-PET control method for supplying power to a passive network on the basis of power grid voltage faults

A grid voltage, passive network technology, applied in control/regulation systems, electrical components, regulating electrical variables, etc., can solve problems such as voltage fluctuations, affecting system stability, passive network power supply power quality, current and power fluctuations, etc.

Active Publication Date: 2020-03-06
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the grid voltage fails, for the outside, the current and power of the AC side will fluctuate, and the voltage of the DC side will also fluctuate, seriously affecting the stability of the system and the power quality of the passive network power supply

Method used

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  • MMC-PET control method for supplying power to a passive network on the basis of power grid voltage faults
  • MMC-PET control method for supplying power to a passive network on the basis of power grid voltage faults
  • MMC-PET control method for supplying power to a passive network on the basis of power grid voltage faults

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Embodiment

[0080] The present invention relates to a control method for an MMC power electronic transformer that supplies power to a passive network based on grid voltage faults, the method comprising the following steps:

[0081] Step 1: If figure 1 As shown, each phase of the input stage of MMC-PET is composed of upper and lower bridge arms, and each bridge arm is composed of n sub-modules (Sub Module, SM) connected in series with bridge arm inductance L and bridge arm equivalent resistance R , each sub-module SM consists of two half-bridges composed of IGBTs with anti-parallel diodes and a capacitor connected in parallel, such as figure 2 Shown is the control block diagram of each part of the MMC power electronic transformer of the present invention, which corresponds to the controller design in the subsequent steps.

[0082] The mathematical model expressions of the AC side and DC side of the input stage of the MMC power electronic transformer are:

[0083]

[0084] where u va...

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Abstract

The invention relates to an MMC-PET control method for supplying power to a passive network on the basis of power grid voltage faults. The method comprises the steps of 1) carrying out positive and negative zero sequence separation on input voltage and current for an MMC-PET input stage, and controlling the positive and negative sequences of the current, 2) verifying the strict passivity of an MMC-PET input stage converter according to an EL mathematical model of the MMC-PET input stage converter, 3) designing a passive controller and a zero sequence current PI controller for positive and negative current generated when a power grid fails, 4) adopting constant direct current voltage and reactive power control for outer loop control of the MMC-PET input stage, 5) adopting circulation suppression of the MMC-PET input stage under the condition of unbalanced power grid voltage, 6) adopting phase-shifting voltage-sharing control for the middle isolation stage of an MMC-PET, and 7) for a three-phase voltage type full-bridge inverter at the output side of the MMC-PET, adopting current decoupling control for an inner loop, adopting fixed alternating voltage control and fixed reactive powercontrol for an outer loop. The method provided by the invention has the advantages of fast dynamic response, wide application range, remarkable control effect and the like.

Description

technical field [0001] The invention relates to the technical field of MMC power electronic transformer control, in particular to a control method for MMC-PET based on a power grid voltage fault that supplies power to a passive network. Background technique [0002] In the power system, the transformer is the most reliable and widely used electrical equipment, but in recent years, with the rapid development of distributed energy, the non-linear loads of these power users in industry, commerce and residences have increased, due to the traditional Distribution transformers lack flexibility and bi-directional energy control capabilities, which can no longer meet the requirements of power systems. Compared with traditional transformers, power electronic transformers (Power Electronic Transformers, PET) using high-frequency transformers have incomparable advantages in voltage sag compensation, instantaneous voltage regulation, power factor correction and harmonic suppression. ...

Claims

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Application Information

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IPC IPC(8): H02M5/458H02M3/335
CPCH02M3/33584H02M5/4585
Inventor 程启明赵淼圳江畅马信乔程尹曼
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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