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Feedback passive control method for direct current microgrid converters

A DC microgrid, passive control technology, applied in the parallel operation of DC power supply and other directions, can solve the problem of high requirements that are not suitable for DC microgrids

Inactive Publication Date: 2017-02-01
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In short, none of the existing stabilization methods based on a global perspective is suitable for the higher requirements of DC microgrids in the future.

Method used

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  • Feedback passive control method for direct current microgrid converters
  • Feedback passive control method for direct current microgrid converters
  • Feedback passive control method for direct current microgrid converters

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Embodiment Construction

[0164] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0165] In order to verify the present invention, a DC microgrid system is established, the layout of the microgrid is as follows figure 1 As shown, it contains 2 PV (photovoltaic array) distributed power sources, 1 battery energy storage system and local loads. The open-loop voltage of photovoltaic array PV1 and photovoltaic array PV2 is 290V, the maximum power point voltage is 240V, and the maximum power point power is 3.5kW. The voltage of the DC bus is 380V. The topology of type I converter is as follows: figure 2 As shown, the topology of type II converter is as follows image 3 shown. The details of each converter configuration are shown in the table below.

[0166] Pv1 Pv1 energy storage Types of Ⅰ Ⅱ Ⅰ Rated power (kW) 3.5 9 10 Switching frequency (kHz) 10 10 10 Input voltage (V) 200～290 1150～15...

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Abstract

The invention discloses a feedback passive control method for direct current microgrid converters. The feedback passive control method comprises the following steps of 1, establishing a direct current microgrid network model, wherein the direct current microgrid comprises a photovoltaic array distributed type power supply, a battery energy storage system and a local load; and classifying the converters according to relative degrees deduced by a state equation of each converter; 2, providing that if the converter with a typical node in the network model is passive, the feedback connection between the converters is also passive, and keeping the overall direct microgrid system at a stable state; 3, further proving that a feedforward passive control parameter is preset for the converters through feedback control according to the different types of the converters to enable the converters to be passive; 4, calculating a primary state feedback parameter K and a passive parameter K<passive>, and finally controlling the parameter K to be equal to K plus K<passive>; and 5, enabling a set and completed control algorithm to be downloaded to a digital signal processor to complete controlling. The feedback passive control method is applicable to plug and play way of the microgrid and a real-time changeable structure.

Description

technical field [0001] The invention relates to a control method of a DC microgrid, in particular to a feedback passive control method for various converters of the DC microgrid. Background technique [0002] Utilizing renewable resources is an effective way to address the high price and environmental pollution of fossil fuels. Distributed generation is an effective way to integrate renewable resources into the grid. Thanks to modern power electronics, direct current can be easily generated from many renewable sources. The current grid technology still cannot fully meet the access requirements of distributed power generation, so the concept of micro-grid came into being. [0003] For DC microgrids, stability issues are crucial and unavoidable. The connection of converters in a microgrid may cause oscillations or even instability to the system. [0004] In recent years, people have done a lot of research on this issue. For example, small-signal stability through impedanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/12
CPCH02J1/12
Inventor 项基及非凡邓鸿桥
Owner ZHEJIANG UNIV