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Direct current micro-grid oscillation suppression method based on band-pass filter in master-slave mode

A DC micro-grid, band-pass filter technology, applied in the direction of DC network circuit devices, load balancing in DC network, electrical components, etc., can solve problems affecting the normal operation of the system, difficult practical application, etc. achieve simple effects

Active Publication Date: 2015-05-20
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +1
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the structure of the system changes, such as putting in a new power supply or cutting off the DC load, these distributed damping controller parameters need to be adjusted accordingly, otherwise it may affect the normal operation of the system
This also makes it difficult for practical applications

Method used

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  • Direct current micro-grid oscillation suppression method based on band-pass filter in master-slave mode
  • Direct current micro-grid oscillation suppression method based on band-pass filter in master-slave mode
  • Direct current micro-grid oscillation suppression method based on band-pass filter in master-slave mode

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Embodiment Construction

[0024] The technical solution of the present invention will be introduced in detail below according to the accompanying drawings.

[0025] The structure of a DC microgrid system in a typical master-slave mode is as follows: figure 1 shown. The DC microgrid is mainly composed of a main power supply, several slave power supplies and DC loads, among which each distributed power supply, energy storage, etc. are equivalent to an ideal DC voltage source, and the DC loads are represented by resistance. Considering that there is a certain distance between the distributed power supply and the load in the actual circuit, the slave power supply in the DC microgrid is connected to the DC bus through a line. The DC-DC converter in the microgrid adopts a Boost topology. The main power supply is controlled by voltage and current double loops to maintain a constant DC bus voltage. The slave power supply adopts current control to provide the required power for the load.

[0026] The inventio...

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Abstract

The invention relates to a direct current micro-grid oscillation suppression method based on a band-pass filter in a master-slave mode. The direct current bus voltage is controlled by a main power supply, a voltage and current dual-loop control mode is adopted, the method aims at two kinds of oscillation modes possibly occurring in a direct current micro-grid, a control system of the main power supply is improved, a feedback channel using output voltage and output current as the feedback quantity is newly added, two groups of corresponding oscillation suppression links are formed, and in a high-frequency component oscillation suppression link, the output voltage of a feedback quantity direct current bus is used as the compensation quantity to be added to the reference voltage of the main power supply control system after passing through a high-frequency band-pass filter; in a low-frequency component oscillation suppression link, the output current of the feedback quantity main power supply is used as the compensation quantity to be added onto the reference voltage of the main power supply control system after passing through a low-frequency band-pass filter. The direct current micro-grid oscillation suppression method has the advantages that the stable operation of the system can be ensured, the realization is simple, and the reliability is higher.

Description

technical field [0001] The invention relates to a control method capable of suppressing system oscillation and instability in a DC microgrid, and belongs to the technical field of distributed power generation microgrids. Background technique [0002] With the continuous improvement of users' attention to power supply reliability and power quality and the extensive use of various forms of renewable energy such as solar energy and wind energy, microgrids, as an effective way for distributed power to connect to the grid, have attracted widespread attention from scholars at home and abroad. . Microgrid generally refers to a small grid form that connects various distributed power sources, energy storage devices and loads through power electronic devices. isolated system running. [0003] Compared with AC microgrids, DC microgrids have many distinctive features. First of all, most distributed power sources, such as photovoltaic cells and wind generators, basically output DC pow...

Claims

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Application Information

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IPC IPC(8): H02J1/14
CPCH02J1/102H02J1/106
Inventor 郭力杜海江
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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