Energy storage current transformer based on multilevel DC/DC converter

A converter and multiplexing technology, applied in AC network load balancing, AC network to reduce harmonics/ripples, harmonic reduction devices, etc., can solve the problems that energy storage converters cannot meet the requirements of optical storage microgrids, etc. , to achieve the effect of good operating characteristics, convenient operation management, and flexible switching

Inactive Publication Date: 2018-06-05
赵志刚
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problem that common energy storage converters cannot meet the requirements of optical storage microgrids, this invention proposes a converter based on multiple DC / DC converters

Method used

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  • Energy storage current transformer based on multilevel DC/DC converter
  • Energy storage current transformer based on multilevel DC/DC converter
  • Energy storage current transformer based on multilevel DC/DC converter

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Embodiment Construction

[0015] specific implementation plan

[0016] like figure 1 As shown, for the current analysis of the m heavy-duty DC / DC module, it is agreed that the switching period of the unit converter is TS, and the switching frequency is . The circuit adopts the PWM modulation mode, and the switching tubes start to turn on with staggered TS / m. If in one switching period TS, the duty cycle D of the switching devices of m conversion units is the same, then the inductor current iL1(t), iL2(t), iL3(t),..., iLm(t) of each circuit is the phase A pulsating current with a difference of TS / m and an identical waveform.

[0017] like figure 2 , image 3 As shown, in the grid-connected mode, energy storage assumes the functions of power smoothing and peak shaving and valley filling in the microgrid, and needs to respond to the power command of the microgrid system in time to make the system reach a stable state. In the grid-connected mode, the DC / AC converter is in the state of rectification o...

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Abstract

The invention discloses an energy storage current transformer based on a multilevel DC / DC converter. The energy storage current transformer comprises three parts including application of the multilevel DC / DC converter, grid-connected mode control and off-grid mode control. The energy storage current transformer adopts a two-stage multi-DC / DC parallel topology. Each DC / DC module adopts a multileveldesign, and optimizes current ripples and harmonics. The inversion part adopts a three-phase voltage type PWM rectifier which has simple principle and is easy to implement. Through the study of functions of the energy storage current transformer under grid-connected / off-grid operating conditions, corresponding control strategies are formulated, and droop control and SOC feedback control are introduced into the control. The designed energy storage current transformer has excellent operating features while performing normal functions.

Description

technical field [0001] The invention relates to an energy storage converter, in particular to a converter based on multiple DC / DC converters. Background technique [0002] The excessive use of non-renewable energy and the environmental problems it brings make people focus more on distributed energy represented by solar energy. However, there are problems and challenges in the development of distributed power generation. For example, wind energy and solar energy have the characteristics of randomness and intermittency, which are difficult to predict accurately manually, and the energy output is unstable, which greatly weakens the role of distributed power generation. [0003] Microgrid is an autonomous system capable of self-control, protection and management. It is generally composed of distributed power sources, energy storage devices, power conversion devices, loads, monitoring systems and protection devices. It is an important part of smart grids. The microgrid can be re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/32H02J3/01
CPCH02J3/01H02J3/32Y02E40/40
Inventor 赵志刚
Owner 赵志刚
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