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A DC microgrid power distribution control method

A technology of a DC microgrid and a control method, which is applied in the direction of DC network circuit devices, electrical components, circuit devices, etc., can solve problems such as needs

Active Publication Date: 2020-11-13
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are also various problems in these methods, such as each DC-DC converter needs the voltage and current information of the other converters, sacrificing the advantages of plug and play

Method used

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  • A DC microgrid power distribution control method
  • A DC microgrid power distribution control method
  • A DC microgrid power distribution control method

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Embodiment

[0017] figure 1 A schematic diagram of a DC microgrid is shown. n DC-DC converters are connected to the DC bus in parallel to supply power to the load, and the average output voltage of the converters is V dci , the average output power is P dci , the line resistance is R dclinei , i=1,2,…,n, the average value of the DC bus voltage is V dcbus .

[0018] The output power of the DC-DC converter is:

[0019]

[0020] The conventional DC droop control equation is:

[0021]

[0022] where k dci is the droop coefficient of the i-th DC-DC converter.

[0023] The droop equation based on cycle-by-cycle power allocation deviation elimination is:

[0024]

[0025] In the formula and are the output voltage and power of the i-th DC-DC converter in the n-th period, respectively. Compared with the conventional DC droop control equation, the first item on the right side of the equal sign in formula (3) uses the output voltage sampling value of the nth cycle Instead of ...

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Abstract

The invention relates to a direct current microgrid technology, in particular to a power distribution control method of a direct current microgrid. The direct-current microgrid comprises n direct current power supplies, wherein each direct current power supply is connected with a direct current bus through a DC-DC converter by a connecting wire, and a load is connected to the direct-current bus. The power distribution control method comprises the following steps of: setting a direct current bus voltage controller and a DC-DC converter controller, taking the error of a reference value and the measured value of the direct current bus voltage as the input of the direct current bus voltage controller, taking the output of the direct current bus voltage controller as a compensation voltage, transmitting a compensation voltage to each DC-DC converter through a communication channel, adding the compensation voltage to a droop control equation of the DC-DC converter controller, and compensating the cycle-by-cycle deviation of power distribution to eliminate the output voltage drop caused by droop control. The method simultaneously achieves power distribution and direct current bus voltageregulation, and has the advantages of the simple achievement, reservation of the plug and play characteristic of the microgrid and the like.

Description

technical field [0001] The invention relates to DC micro-grid technology, in particular to a DC micro-grid power distribution control method. Background technique [0002] The DC microgrid includes DC power sources such as photovoltaic arrays, fuel cells, and energy storage units and various DC loads. It has the advantages of omitting some AC-DC conversion devices, no frequency stability problems, no need to adjust reactive power, and high reliability. Extensive research and application. [0003] In a DC microgrid, the DC power supply is usually connected to the DC bus through a DC-DC converter. The DC-DC converter is used to provide voltage support for the DC bus and adjust the power exchanged between the DC power supply and the DC microgrid. Since the rated power of the DC power supply is different, it is necessary to distribute the power demand of the DC microgrid proportionally among the DC power supplies according to the rated power of the DC power supply. [0004] Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J1/00
CPCH02J1/00
Inventor 王晓刚杨汝胡维张杰刘贵云
Owner GUANGZHOU UNIVERSITY
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