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A virtual synchronous machine control system and method based on power electronic transformer

A technology of virtual synchronous machine and power electronics, applied in the field of virtual synchronous machine, can solve the problems of high cost, complex control system, low efficiency, etc., and achieve the effect of low cost, simple control system and high efficiency

Active Publication Date: 2020-09-08
XJ ELECTRIC +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a virtual synchronous generator control system and method based on power electronic transformers, which is used to solve the problems of complex, low efficiency, and high cost of the substation virtual synchronous generator control system in the prior art

Method used

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  • A virtual synchronous machine control system and method based on power electronic transformer
  • A virtual synchronous machine control system and method based on power electronic transformer
  • A virtual synchronous machine control system and method based on power electronic transformer

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Embodiment Construction

[0030] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0031] An embodiment of a virtual synchronous machine control system based on a power electronic transformer of the present invention:

[0032] A power station virtual synchronous generator control system based on power electronic transformer topology, such as image 3 As shown, the control system includes an MMC converter, an ISOP (input-series-output-parallel) high-frequency isolation converter and a battery pack. The AC side of the MMC is connected to the AC35KV or AC10KV power grid, and the MMC converter includes a three-phase bridge Each phase bridge arm includes n cascaded MMC sub-modules and bridge arm reactors. Each MMC sub-module includes 2 IGBTs, a DC capacitor and a discharge resistor. The DC side of the MMC converter is isolated from the high-frequency converter The high-frequency isolation converter includes several DC / DC sub-modules...

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Abstract

The invention provides a virtual synchronous machine control system and method based on a power electronic transformer. The system includes a high-voltage-side MMC, an isolated DC / DC converter and a battery pack. The MMC converts the three-phase AC voltage at a high-voltage side into high-voltage DC voltage. The main function of the isolated DC / DC converter is to convert the high-voltage DC voltage obtained by the MMC into low-voltage DC voltage. The virtual synchronous machine control system can meet the requirements of a large-capacity virtual synchronous machines (above 5MW) with low switching frequency and low loss, requires no isolation transformer, achieves high efficiency, realizes low harmonics by using a MMC multilevel structure at a DC / AC side, achieves DC output less than DC1000V to meet a lithium battery voltage range requirement, and is low in cost, easy to implement. Moreover, the virtual synchronous machine control system can realize the functions of primary frequency modulation, inertial damping and reactive voltage regulation, and the control method is flexible.

Description

technical field [0001] The invention belongs to the technical field of virtual synchronous machines, and in particular relates to a virtual synchronous machine control system and method based on power electronic transformers. Background technique [0002] my country's installed capacity of wind power and photovoltaics ranks first in the world and maintains rapid development. Compared with synchronous generators such as thermal power, wind power and photovoltaic power generation do not have the ability to damp power oscillation, inertial frequency regulation, and independent voltage regulation. After being connected to the grid on a large scale, it will affect the voltage / frequency stability of the grid. [0003] By tracking system frequency and voltage changes in real time, the virtual synchronous machine simulates the primary frequency modulation and excitation control mechanism of synchronous generators, automatically adjusts active and reactive power output, and participa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/46H02J3/16
CPCY02E40/30
Inventor 姚为正刘刚孙健徐明明翟超王青龙汪海涛李继凯
Owner XJ ELECTRIC
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