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A DC residential microgrid system and voltage compensation control method

A voltage compensation and micro-grid technology, applied in the field of household DC distributed power generation systems, can solve the problems of DC bus voltage drop, unfavorable load stable operation, affecting voltage control accuracy, etc., to reduce requirements, improve control accuracy and reliability. The effect of sex and control method is simple

Active Publication Date: 2019-04-23
HEFEI UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the droop control will affect the voltage control accuracy, causing the DC bus voltage to drop, which is a differential regulation, which is not conducive to the stable operation of the load in the DC residential microgrid system

Method used

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  • A DC residential microgrid system and voltage compensation control method
  • A DC residential microgrid system and voltage compensation control method
  • A DC residential microgrid system and voltage compensation control method

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Experimental program
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Embodiment Construction

[0045] see figure 1 , the DC residential microgrid system in this embodiment includes a high-voltage DC bus B H , medium voltage DC bus B M , Low-voltage DC bus B L , energy storage unit, grid-connected unit, renewable energy generation unit and household appliance load.

[0046] In this embodiment, the high voltage DC bus voltage V H is 380V, the medium voltage DC bus voltage V M 48V, low voltage DC bus voltage V L 24V; high voltage DC bus B H Through the Buck converter Con1 and the medium voltage DC bus B M Connection; MV DC bus B M Through the Buck converter Con2 and the low-voltage DC bus B L Connection; the energy storage unit includes a battery pack, and the battery pack is connected to the high-voltage DC bus B through the bidirectional Buck / Boost converter Con3 H Connection; grid-connected unit includes bidirectional DC / AC converter Con4 and transformer, grid-connected unit and high-voltage DC bus B H connection; the renewable energy power generation unit inc...

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Abstract

The invention discloses a direct current residence micro-network system and a voltage compensation control method. The direct current residence micro-network system is characterized by comprising an energy storage unit, a grid connecting unit, a renewable energy power generation unit and a household appliance load. A three-level busbar structure is adopted; different voltage level requirements of different loads in the system can be met; a voltage compensation link is utilized to add a total load current of the system into a reference voltage under droop control of each convertor, so that the direct current busbar voltage offset brought by the droop control of the convertor can be compensated. The direct current residence micro-network system has the advantages that the running mode is flexible, the reliability is high, the control method is simple, the control precision for the direct current busbar voltage of the system is increased and the stable operation of a micro-source and household load of the direct current residence micro-network system can be realized.

Description

technical field [0001] The invention relates to a household type DC distributed power generation system, in particular to a DC residential micro-grid system and a voltage compensation control method. Background technique [0002] As conventional energy shortages and environmental pollution problems become increasingly prominent, the proportion of renewable clean energy power generation in total power generation is gradually increasing. Since renewable energy sources such as photovoltaic cells produce direct current, when applying such energy in an AC grid, it is necessary to convert direct current into alternating current. In the process of DC / AC conversion, there will be problems such as the need for a DC / AC converter, energy loss and Reactive power and other issues. At the same time, because many household appliances tend to use DC or converters with DC links, such as LED lighting equipment, mobile phones and computers, etc., use DC to work, and washing machines, air cond...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J1/12H02J1/14
CPCH02J1/12H02J1/14
Inventor 茆美琴李晶菁张榴晨张涛
Owner HEFEI UNIV OF TECH
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