Droop control method of DC converter with function of secondary adjustment of adaptive impedance

A DC converter and secondary regulation technology, which is applied in parallel operation of DC power supplies, can solve the problems of low steady-state and dynamic current sharing accuracy and poor drooping current sharing effect of parallel DC converters

Active Publication Date: 2015-07-01
HARBIN INST OF TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

[0006] The present invention aims to solve the problem of poor drooping current sharing effect caused by the difference in cable impedance of distributed power generation units in a DC distributed power supply system based on droop control and a DC microgrid, and low steady-state and dynamic current sharing accuracy of parallel DC converters problem, now provides a DC converter droop control method with adaptive impedance secondary adjustment

Method used

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  • Droop control method of DC converter with function of secondary adjustment of adaptive impedance
  • Droop control method of DC converter with function of secondary adjustment of adaptive impedance
  • Droop control method of DC converter with function of secondary adjustment of adaptive impedance

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specific Embodiment approach 1

[0038] Specific implementation mode one: refer to Figure 4 Specifically illustrate the present embodiment, the DC converter droop control method with adaptive impedance secondary adjustment described in the present embodiment, it comprises the following steps: secondary control adjustment step and droop control step;

[0039] The secondary control adjustment steps are:

[0040] The output voltage, current and droop coefficient of each converter in the DC distributed power supply system are collected through the slow communication line, and then the average output voltage v of the converter in the system is calculated respectively avg , the average amount of output current i avg and the average amount of droop coefficient r avg ;

[0041] The average output voltage v avg and bus voltage given value v ref After making a difference, the average voltage adjustment is performed on the obtained difference Δv to obtain the drooping curve translation amount δv;

[0042] The avera...

specific Embodiment approach 2

[0071] Specific embodiment 2: This embodiment is a further description of the DC converter droop control method with adaptive impedance secondary adjustment described in specific embodiment 1. In this embodiment, before all steps, the following steps are carried out :

[0072] Step 1: Keep the output voltage of the converter at a given reference value;

[0073] Step 2: Design the given value of the droop coefficient according to the converter capacity, quantity and allowable range of the bus voltage;

[0074] Step 3: Build a system slow communication network, so that each converter can send its own voltage, current and droop coefficient to other converters, and at the same time receive information such as voltage, current and droop coefficient of other online converters.

specific Embodiment approach 3

[0075] Embodiment 3: This embodiment is to further explain the droop control method of DC converter with adaptive impedance secondary adjustment described in Embodiment 1. In this embodiment, the DC converter droop control method is also Including inner loop control steps, the steps are as follows:

[0076] The given reference of the voltage outer ring and the output voltage v of the nth converter DGn The difference is sent to the voltage control loop, and the voltage control loop outputs the fourth intermediate variable V 4 ;

[0077] The fourth intermediate variable V 4 and the current i flowing through the boost converter diode D o The difference is sent to the current control loop, and the signal output by the current control loop passes through the PWM generator to drive the switching tube of the boost converter.

[0078] The function of the inner loop control is to adjust the output voltage of the boost converter to be stable near a given reference value.

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Abstract

The invention belongs to the technical field of droop control of DC converters, relates to a droop control method of a DC converter with a function of secondary adjustment of adaptive impedance, and aims to solve the problems that distributed generating unit cable impedance difference causes poor droop current homogenization effect to the DC distributed power supply system and the DC micro grid based on droop control and the parallel DC converters is low in steady state and dynamic current homogenization precision. The method has the advantages that the steady state and dynamic current homogenization precision of the parallel DC converters in the distributed DC power supply system and the DC micro grid based on droop control is improved; parameters, such as voltage, current and droop coefficient, of the parallel converters are transmitted in real time through low-speed communication, the droop coefficient is adjusted in self-controllers of the parallel converters, and finally external characteristic impedances of the parallel converters are equalized; droop curves are subjected to shifting adjustment, and bus voltage drop caused by droop control is improved.

Description

technical field [0001] The invention belongs to the technical field of dc converter droop control. Background technique [0002] In DC distributed power supply systems and DC microgrids, there are usually cases where multiple power generation units operate in parallel. Common coordinated control methods for parallel operation of DC converters include master-slave control method and droop control method. [0003] The master-slave control method sets a master and makes it stabilize the output voltage of the system, and other parallel units operate as slaves through high-speed communication lines. When the host computer or the communication line fails, the system will not be able to continue to operate, and when the distance between the converters is far away, it is difficult to implement this method. [0004] The droop control method is simple, no communication line is required, and it is easy to expand, so that all units in the DC power supply system can operate in an equal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/10
CPCH02J1/12
Inventor 王卫王盼宝杨旭孟尼娜吴炎徐殿国
Owner HARBIN INST OF TECH
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