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Control method of mmc-pet for passive network power supply based on grid voltage fault

A grid voltage and passive network technology, applied in the direction of control/regulation systems, electrical components, and adjustment of electrical variables, can solve current and power fluctuations, voltage fluctuations, and passive network power supply quality that affect system stability. Achieve the effect of reducing influence, fast dynamic response and remarkable control effect

Active Publication Date: 2021-10-08
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Control method of mmc-pet for passive network power supply based on grid voltage fault
  • Control method of mmc-pet for passive network power supply based on grid voltage fault
  • Control method of mmc-pet for passive network power supply based on grid voltage fault

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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 present invention relates to a control method for MMC-PET powered by a passive network based on grid voltage faults, including: 1) for the MMC-PET input stage, the positive and negative zero-sequence separation of the input voltage and current is carried out, and for the current Positive and negative sequence control, 2) According to the EL mathematical model of the MMC-PET input stage converter, its strict passivity is verified, 3) A passive controller and zero sequence Current PI controller, 4) the outer loop control of the MMC-PET input stage adopts constant DC voltage and reactive power control, 5) adopts the circulating current suppression of the MMC-PET input stage suitable for grid voltage unbalanced conditions, 6) for The middle isolation stage of MMC-PET adopts the control of phase-shifting and voltage equalization. 7) For the three-phase voltage type full-bridge inverter on the output side of MMC-PET, the inner loop adopts current decoupling control, and the outer loop adopts constant AC voltage control For constant reactive power control, 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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Patent Type & Authority Patents(China)
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