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Distributed optimization control method and device for off-grid direct-current micro-grid

A DC microgrid, optimized control technology, applied in the field of microgrid, can solve the problems of large difference in control strategies and difficult application.

Pending Publication Date: 2022-01-28
SHANGHAI MUNICIPAL ELECTRIC POWER CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods combine real-time control with optimal operation, but they still have some limitations
For example, the underlying control strategy of the microgrid must be modified to the proposed method, which is difficult to apply in practice because the microgrid may belong to different owners and the control strategies differ greatly

Method used

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  • Distributed optimization control method and device for off-grid direct-current micro-grid
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  • Distributed optimization control method and device for off-grid direct-current micro-grid

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Embodiment 1

[0039] The present invention provides a distributed optimization control method for an off-grid DC microgrid, comprising the following steps:

[0040] Obtain the local information and neighbor node information of the microgrid, use the constant power control strategy, constant voltage control strategy and droop control strategy to carry out optimal control calculations, and obtain the power and voltage in the transient process through the constant power control strategy and constant voltage control strategy The reference value is used to control the microgrid, and the reference value of the power in the droop control is obtained through the droop control strategy to control the microgrid.

[0041] The constant power control strategy has a power loop and a current loop, the constant voltage control strategy has a voltage loop and a current loop, and the droop control strategy has a droop loop, a power loop and a current loop.

[0042] Before the constant power control strategy ...

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Abstract

The invention relates to a distributed optimization control method and device for an off-grid direct-current microgrid, and the method comprises the following steps: obtaining local information and neighbor node information of the microgrid, and carrying out the optimization control calculation through employing a constant-power control strategy, a constant-voltage control strategy and a droop control strategy; acquiring the reference values of power and voltage in the transient process through a constant power control strategy and a constant voltage control strategy, carrying out the micro-grid control, acquiring a reference value of power in droop control through a droop control strategy, and carrying out the micro-grid control. Compared with the prior art, the method avoids the limitation of various bottom layer control is broken through so that optimal operation can be achieved, control precision is improved, and safety and reliability of control instructions are guaranteed.

Description

technical field [0001] The invention relates to the field of microgrids, in particular to a distributed optimization control method and device for off-grid DC microgrids. Background technique [0002] Microgrid is a form of power supply developed in recent years, usually divided into two types: AC and DC microgrid. In the past decade, more research has focused on improving the performance of AC microgrids. However, some generation and loads are inherently DC, such as photovoltaics, batteries, electric vehicles, etc. A DC microgrid would be a more natural way to connect, eliminating unnecessary conversion processes and thus improving system efficiency and reliability. In addition, there are no problems such as reactive power compensation, frequency stability and synchronization in the DC system, making it a promising application prospect. Similar to the AC grid, in the DC microgrid, hierarchical control is also used, namely primary control, secondary control and tertiary c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/06H02J3/38H02J3/46
CPCH02J3/36H02J3/06H02J3/381H02J3/466H02J2203/10H02J2203/20H02J2300/40Y02E60/60
Inventor 时珊珊周健杨心刚杜洋魏新迟张开宇任辰郭灵瑜
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO