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Multi-mode switching coordination control method for direct current micro-grid system

A DC micro-grid, coordinated control technology, applied in the field of multi-mode switching coordinated control, can solve the problem that the transient process is not analyzed in detail.

Active Publication Date: 2016-01-06
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

However, there is no specific analysis of transient processes such as grid-connected to off-grid operation

Method used

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  • Multi-mode switching coordination control method for direct current micro-grid system
  • Multi-mode switching coordination control method for direct current micro-grid system
  • Multi-mode switching coordination control method for direct current micro-grid system

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Embodiment

[0061] A multi-mode switching coordinated control method for a DC microgrid system, the DC microgrid system includes a DC microgrid and multiple energy storage units, the DC microgrid includes multiple microgrid units, and the multiple The micro-grid unit and a plurality of energy storage units are respectively connected to the DC bus, each of the micro-grid units generates electricity through a distributed power supply DG, and the multi-mode switching coordination control method of the DC micro-grid system includes the following steps:

[0062] S1, obtain the operating status of the DC microgrid, if it is grid-connected operation, then enter step S2, if it is island operation, then enter step S3;

[0063] S2, taking the difference between the load power of the DC bus and the output power of the DC microgrid as the shortfall power, if the shortfall power is non-negative, proceed to step S21, and if the shortfall power is negative, proceed to step S22;

[0064] S21. Determine t...

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Abstract

The invention relates to a multi-mode switching coordination control method for a direct current micro-grid system. Specific models are built for each micro-grid unit in the micro-grid system, working modes of the operation of the system are divided, various disturbance influences in various modes are full considered, and stable operation of the system in grid-connected and off-grid operation stable state and various disturbances thereof such as mutual switching and load and generating fluctuation is realized. According to the method, according to the load bus voltage and specific condition, the control strategy is reasonably adjusted, and the system can operate in a stable manner in different working modes and conditions; the micro-grid units and the coordination control method between the micro-grid units are controlled regarding the voltage as the control main body, stable operation of the system is guaranteed, frequent power exchange between the micro-grid units is avoided, and the power consumption is reduced; and compared with the prior art, the power grade of a converter is reduced, the system security and the reliability of energy storage are improved, and the failure rate due to an energy storage system is reduced.

Description

technical field [0001] The invention relates to a coordinated control method for a micro-grid, in particular to a coordinated control method for multi-mode switching of a DC micro-grid system. Background technique [0002] As a form of microgrid that connects distributed power and the main grid, DC microgrid can efficiently play the value and benefits of distributed power, and has more flexible reconfiguration capabilities than AC microgrid. In addition, many new energy units have a DC output form, and the DC system does not have problems such as phase synchronization, harmonics, and reactive power loss. Therefore, in recent years, DC microgrids have gradually received people's attention. Breakthroughs have been made in the researches on , operation modes and control methods. [0003] However, due to the large number of controllable micro-power sources in the micro-grid, in-depth research is still needed to coordinate the work of each converter to realize the energy managem...

Claims

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Application Information

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IPC IPC(8): H02J1/14
Inventor 米阳吴彦伟韩云昊张寒符杨
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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