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Communication Method for Energy Management of DC Micro-grid

IP.com Disclosure Number: IPCOM000247140D
Publication Date: 2016-Aug-10

Publishing Venue

The IP.com Prior Art Database

Related People

HaiLian Xie: AUTHOR [+3]

Abstract

This disclosure proposed one communication principle for the energy management of DC micro-grid. It can be used for the optimized energy management of a plurality of converters in the DC micro-grid. It can deal with some special scenarios which are ignored by the others, improve the reliability and realize the plug and play function together with the optimized energy management.

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Communication method for energy management of DC micro-grid

1 PRINCIPLE APPLICATIONS/USES OF THE DISCLOSURE

This disclosure proposed one communication principle for the energy management of DC micro-grid. It can be used for the optimized energy management of a plurality of converters in the DC micro-grid. It can deal with some special scenarios which are ignored by the others, improve the reliability and realize the plug and play function together with the optimized energy management.


2 BACKGROUND

In order to improve the performance or ensure the reliability of a plurality of converters which work in parallel through a DC common bus, e.g., DC micro-grid, some innovations for cooperation work of converters are proposed. Using communication signal bus is the most common way.

According to some of the background technology, the aggregated quantity of energy request is forecasted, and a communication port transmits commands to the pulse width modulation (PWM) controller to distribute energy to an electrical grid in response to the energy request. According to some of the background technology, the energy management system includes a communication interface for determining the present energy demand from the consumer and controlling the input module and/or energy converters to provide the power needed by the consumer. The communication signal bus can be used to optimize the energy management. As these methods depend on the communication, some studies proposed solutions for the scenarios that the whole communication is lost, e.g., the central controller is broken. However, the scenarios that only the communication of one or more converters are lost are ignored and cannot be dealt with by these methods. Moreover, a new converter must possess a communication port if it wants to connect to the existed system with communication signal bus. It has to set up the communication before start to work, so the plug and play function cannot be realized.

Some innovations proposed the system adjusting method without communication. According to some of the background technology, the DC bus operating voltage fluctuates between a minimum bus operating voltage to a maximum bus operating voltage, and each converter adjusts its own control mode according to the DC bus voltage. It can achieve the system stability in the most situations, but there will be large voltage deviations in the DC common bus. Moreover, this method cannot optimize the energy management.

Furthermore, there are some communication methods without communication signal bus. They can transmit data through the power line of the DC common bus. Some of the background technology proposes the DC carrier wave communication which is widely used in the AC system. A signal sending module sends the data signal into the DC common bus, and a signal receiving module receives the data signal from the DC common bus. The data signal is AC signal and depends on the frequency. However, this method needs sign...