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Decoupling Control Method of DC Microgrid Converter Based on Droop Control

A DC microgrid and decoupling control technology, applied in the direction of DC network circuit devices, electrical components, circuit devices, etc., can solve the problems of low DC bus voltage and uneven output current, and achieve the realization of bus voltage, compensation for voltage drop, and realization of The effect of using

Active Publication Date: 2018-11-30
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the above problems, the present invention proposes a decoupling control method for DC microgrid converters based on droop control. The bus voltage is lower than the rated value, the bus voltage can be kept constant while the current is shared, and the coupling relationship between the two converters in the adjustment process is eliminated, and the dynamic performance is better

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  • Decoupling Control Method of DC Microgrid Converter Based on Droop Control

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Embodiment Construction

[0038] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0039] 1. Research on peer-to-peer control of DC microgrid

[0040] 1.1 Droop control structure

[0041] Complex DC microgrids mostly adopt peer-to-peer control strategies, and multiple units support the DC bus voltage through droop control. figure 1 Shown is a block diagram of the droop control.

[0042] figure 1 The box inside is the equivalent circuit of DC-DC converter with droop control, and the droop control can be expressed as

[0043] V dci =V i * -I i r i (1)

[0044] where V i * , V dci , I i 、r i are respectively the given value of droop control voltage, output voltage, output current, and droop coefficient equivalent virtual impedance of the i-th converter, i=1, 2. Bus voltage V d can be expressed as

[0045] V d =V 1 * -I 1 r 1 -I 1 · R 1 (2a)

[0046] V d =V 2 * -I 2 r 2 -I 2 · R 2 (2b)

[0047] where R ...

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Abstract

The invention discloses a droop control based decoupling control method for a direct current microgrid converter. The decoupling control method comprises the steps of collecting droop control output voltages and output currents of two converters separately, and collecting the circuit impedance values from the converters to busses; determining the bus voltage according to the collection parameters; calculating the difference value between the bus voltage and a bus voltage rated value, and the difference value between the output current and the output current average value respectively; judging whether the product of the two difference values is greater than or equal to zero or not; and if so, controlling the voltage set value by adopting a PI controller. The droop control based decoupling control method has the beneficial effects as follows: the current sharing of the DC-DC converter can be realized by adjusting the voltage set value in the droop control, so that the converter can output power which is proportional to the rated capacity so as to realize the optimization utilization of the converter.

Description

technical field [0001] The invention belongs to the technical field of converter current sharing and bus voltage restoration, and in particular relates to a droop control-based DC microgrid converter decoupling control method. Background technique [0002] Microgrid is an integrated system of power generation, transmission, distribution, and power consumption that includes small distributed power sources, energy storage devices, control devices, and controllable loads. It can operate independently (island mode); it can also run in parallel with the grid. (grid-connected mode), improve the reliability and safety of power supply, and at the same time greatly help to improve the utilization rate of distributed power supply and reduce the impact of intermittent power supply on the user's power quality. [0003] At present, there have been many studies on AC microgrids. However, the DC power generated by distributed power generation systems such as photovoltaic cells and fuel cel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J1/00
CPCH02J1/00
Inventor 杜春水贾立朋张承慧陈阿莲王伟秦昌伟
Owner SHANDONG UNIV
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