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Energy type router and soft charging control method and system thereof

A control method and router technology, applied in the electric power field, can solve the problems of overvoltage and voltage distortion, unable to generate stable DC bus voltage, and unable to quickly charge the capacitor to the rated voltage, so as to avoid overvoltage and voltage distortion and improve soft charging. Efficiency, to achieve the effect of smooth start

Active Publication Date: 2020-03-31
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]In order to solve the problem that a large number of scattered sub-module capacitors in the system cannot be quickly charged to the rated voltage, and cannot generate a stable DC bus voltage to charge subsequent modules, resulting in overvoltage and To solve the problem of voltage distortion, the present invention provides an energy router and its soft charging control method and system

Method used

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  • Energy type router and soft charging control method and system thereof
  • Energy type router and soft charging control method and system thereof
  • Energy type router and soft charging control method and system thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] An energy router, such as figure 1 As shown, including: a plurality of three-phase modular multilevel converters and the same number of DAB sub-modules as the three-phase modular multilevel converters;

[0057]The three-phase modular multilevel converter and the DAB sub-module are connected in parallel to form a module group; the module group is connected to the high-voltage AC side of the power grid;

[0058] The three-phase modular multilevel converter and the DAB sub-module respectively include: a capacitor;

[0059] Based on the comparison result between the capacitor voltage of the three-phase modular multilevel converter and the preset voltage threshold and target value, the capacitor of the three-phase modular multilevel converter and the DAB sub-module capacitor charging.

[0060] The three-phase modular multilevel converter also includes: an upper bridge arm IGBT tube and a lower bridge arm IGBT tube; the lower bridge arm is connected to the high-voltage AC s...

Embodiment 2

[0077] A method for controlling soft charging of an energy router, a method for controlling soft charging of an MMC type energy router, the steps comprising:

[0078] Step 1: Obtain the capacitor voltage of the three-phase modular multilevel converter;

[0079] Step 2: When the capacitor voltage of the three-phase modular multi-level converter is lower than the target voltage value, charge the capacitor of the three-phase modular multi-level converter based on the AC voltage and the system enable signal until the target voltage value is reached;

[0080] Step 3: the capacitor of the three-phase modular multilevel converter charges the capacitor of the DAB sub-module;

[0081] Step 1: Obtain the capacitor voltage of the three-phase modular multilevel converter;

[0082] The pre-charging process of the system is mainly divided into the MMC uncontrollable charging process, the MMC controllable charging process and the DC level controllable charging process. The system first perf...

Embodiment 3

[0096] Based on the same concept and invention, the present invention also provides a soft charging control system for an energy router, the system comprising:

[0097] Obtaining module: used to obtain the capacitor voltage of the three-phase modular multilevel converter;

[0098] The first charging module: used for charging the capacitor of the three-phase modular multi-level converter based on the AC voltage until the preset voltage threshold is reached voltage threshold;

[0099] The second charging module: used for the capacitor of the three-phase modular multilevel converter to charge the capacitor of the DAB sub-module.

[0100] The first charging module includes: a first charging unit and a second charging unit;

[0101] The first charging unit is configured to charge the three-phase modular multi-level converter through the anti-parallel diodes of the IGBT tubes based on the AC voltage when the acquired capacitor voltage of the three-phase modular multi-level convert...

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Abstract

The invention discloses an energy type router and a soft charging control method and system thereof. The energy type router comprises a plurality of three-phase modular multilevel converters and DAB sub-modules, wherein the number of the DAB sub-modules is the same as that of the three-phase modular multilevel converters; the three-phase modular multilevel converters and the DAB sub-modules are connected in parallel to form a module group. The module group is connected to a high-voltage alternating-current side of a power grid; each of the three-phase modular multilevel converter and the DAB sub-module comprises a capacitor, a first capacitor and a second capacitor. Capacitors of the three-phase modular multilevel converters and the capacitors of the DAB sub-modules are charged based on acomparison result of the capacitor voltage of the three-phase modular multilevel converters and a preset voltage threshold and a target value. According to the invention, rapid and stable charging ofab AC-stage sub-module capacitor can be realized, the DC-stage DAB module charging does not need an additional circuit, the cost is saved, smooth starting of the output-side voltage is realized, andthe overall efficiency and stability of soft charging of the energy router system are further improved.

Description

technical field [0001] The invention relates to the field of electric power, in particular to an energy-based router and its soft charging control method and system. Background technique [0002] With the rapid development of economy and society, people's demand for electric energy is increasing, the traditional fossil fuel power generation has been in crisis, and renewable energy power generation represented by solar energy and wind energy has been widely used in countries all over the world, and Renewable energy power generation is often a distributed energy source with a long distance. How to use these energy sources conveniently and achieve efficient power transmission has become a major problem in the power industry today. Smart microgrid and flexible DC transmission technology emerged to solve these problems. Smart microgrid is a small power generation and distribution system with power electronics technology as the core. It is a combination of renewable energy power g...

Claims

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Application Information

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IPC IPC(8): H02M7/483H02M1/36
CPCH02M7/483H02M1/36H02M7/4835Y02B70/10
Inventor 沙广林盛万兴段青马春艳赵彩虹李振李鹏华
Owner CHINA ELECTRIC POWER RES INST
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