Direct current microgrid coordination control method including bus voltage compensation and dynamic allocation of load power

A DC micro-grid and bus voltage technology, applied in the direction of reducing/preventing power oscillation, single-grid parallel feeding arrangement, etc., can solve problems affecting the accuracy of load power distribution, etc.

Inactive Publication Date: 2019-06-07
ZHEJIANG UNIV OF TECH
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Problems solved by technology

However, traditional droop control has inherent contradictions in DC bus voltage regulation and load power dis

Method used

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  • Direct current microgrid coordination control method including bus voltage compensation and dynamic allocation of load power
  • Direct current microgrid coordination control method including bus voltage compensation and dynamic allocation of load power
  • Direct current microgrid coordination control method including bus voltage compensation and dynamic allocation of load power

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Embodiment Construction

[0110] The present invention will be further described below in conjunction with the accompanying drawings.

[0111] refer to Figure 1 to Figure 14 , a DC microgrid coordinated control method including bus voltage compensation and load power dynamic distribution, comprising the following steps:

[0112] S1: Build an independently operating DC microgrid, including distributed power generation for low-carbon power generation, energy storage systems that compensate for the intermittent and random nature of distributed power generation, and DC loads;

[0113] S2: Analyze the defects of traditional droop control in the DC microgrid and the reference value of the bus voltage in the preset DC microgrid system;

[0114] S3: Sampling the output voltage values ​​of all distributed power sources, and calculating the average voltage in the microgrid;

[0115] S4: Using a PI controller, the difference between the average voltage in the microgrid and the reference value of the bus voltag...

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Abstract

The invention discloses a direct current microgrid coordination control method including bus voltage compensation and dynamic allocation of load power. An independently operated direct current microgrid can be constructed, and includes a distributed power supply for realizing low-carbon power generation, an energy storage system for compensating the intermittence and randomness of the distributedpower supply and a frequently-used direct current load; defects of traditional droop control in the direct current microgrid and the reference value of bus voltage in a direct current microgrid systemcan be analyzed; distributed secondary control considering voltage adjusting control and current correction control can be provided, and a strategy performs compensation on the direct current bus voltage brought by the traditional droop control so that the bus voltage can be recovered to a rated value; and the high precision load power distribution can be achieved by continuously adjusting droopcoefficients. Thus, communication requirements can be reduced; and through the utilization of bottom broadband communication, the high performance of load power distribution of island direct current microgrids can be realized, the reliability of the system can be enhanced, balance of supply and demand can be ensured, and stable bus voltage and small fluctuation can be achieved.

Description

technical field [0001] The invention belongs to the technical field of compensating busbar voltage and power output balance design of micro-source converters in DC microgrid, and specifically relates to a DC microgrid coordinated control method including busbar voltage compensation and load power dynamic distribution Background technique [0002] In recent years, due to the increasingly prominent environmental problems and the increasing proportion of renewable energy in the power system, distributed energy has developed rapidly. As a way to solve the problem of distributed energy accessing the grid, scholars have proposed the concept of microgrid. [0003] Energy Internet is an important means to solve future large-scale renewable energy power generation access, improve power quality and user demand side management level, and enhance the security, reliability and economy of power grid system. The development of smart grid and the concept of energy interconnection are propos...

Claims

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Application Information

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IPC IPC(8): H02J3/46H02J3/24
Inventor 张有兵李祥山王国烽杨晓东徐鉴其魏春
Owner ZHEJIANG UNIV OF TECH
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