Distributed droop control method based on active-disturbance-rejection control technology for DC microgrid

A technology of DC microgrid and active disturbance rejection control, which is applied in the coordinated control of DC microgrid including bus voltage compensation and load power dynamic distribution, and droop control field including ADRC, which can solve the problem of voltage and current deviation, microgrid Stable operation impact and other issues to achieve the effect of improving limitations

Active Publication Date: 2019-07-12
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the DC microgrid based on traditional droop control is in operation, it is susceptible to the influence of load fluctuations, which will cause voltage and current offsets, which will affect the stable operation of the microgrid.

Method used

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  • Distributed droop control method based on active-disturbance-rejection control technology for DC microgrid
  • Distributed droop control method based on active-disturbance-rejection control technology for DC microgrid
  • Distributed droop control method based on active-disturbance-rejection control technology for DC microgrid

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Embodiment Construction

[0068] The present invention will be further described below in conjunction with the accompanying drawings.

[0069] refer to Figure 1 to Figure 11 , a DC microgrid distributed droop control method based on active disturbance rejection control technology, comprising the following steps:

[0070] S1: Build a DC microgrid model for island operation, including distributed power sources, DC loads and various power electronic interface devices;

[0071] S2: Sampling the output voltage value of the distributed power supply and the bus voltage value as the input signal of the voltage outer loop; sampling the output current value of all distributed power supplies, and calculating the average current information in the microgrid as the input signal of the current inner loop;

[0072] S3: Both the voltage outer loop and the voltage inner loop adopt a linear voltage-current double-loop active disturbance rejection controller to obtain the compensation correction amount for adjusting th...

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Abstract

The invention provides a distributed droop control method based on the active-disturbance-rejection control technology for a DC microgrid. A distributed power system, a load and various power electronic interface devices are included. The active-disturbance-rejection control technology is applied to a droop control strategy, active-disturbance-rejection control structures are employed by voltage and current loops, the voltage stability and current distribution of the system are achieved, and the structure is robust to the system uncertainty and external disturbance. By designing a novel secondary control strategy, the DC bus voltage deviation is reduced while the current distribution precision is guaranteed. The method is different from other proposed control methods, according to the proposed method, only the sampling of global current information at a discrete moment is needed, the communication burden is reduced, and the anti-interference performance is strong.

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 micro-grids, and relates to a distributed droop control method for DC micro-grids based on ADRC control technology, and in particular to DC micro-grids with ADRC controlled droop control method. 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] With the increasing penetration of renewable energy into modern power grids, the concept of microgrids has been proposed as a collective entity integrating distributed generators and controllable / uncontrollable loads. Due to the characteristic coupling of various types of sources and loads in microgri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/10H02J1/14H02J3/38H02J7/34
CPCH02J1/10H02J1/14H02J3/381H02J7/34H02J7/345H02J3/388
Inventor 魏春徐鉴其李祥山余金城徐向志张有兵
Owner ZHEJIANG UNIV OF TECH
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