Cooperative control method of AC-DC microgrid converter cascade system

A cascade system and collaborative control technology, applied in the direction of converting DC power input to DC power output, converting AC power input to DC power output, and adjusting electrical variables, can solve the problem of exacerbating low-frequency fluctuations of DC bus voltage and endangering system safety. , Reduce system damping and other issues, achieve the effect of improving power transmission capability and stability, improving power transmission capability and stability, and eliminating negative effects

Pending Publication Date: 2020-06-09
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
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Problems solved by technology

For example, in a DC microgrid, a DC LC filter is often used in the converter to eliminate high-frequency harmonics, but the inductance will aggravate the low-frequency fluctuations of the DC bus voltage, reduce the damping of the system, and endanger the safety of the system.

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  • Cooperative control method of AC-DC microgrid converter cascade system
  • Cooperative control method of AC-DC microgrid converter cascade system
  • Cooperative control method of AC-DC microgrid converter cascade system

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Embodiment Construction

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. the embodiment. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0024] In modern power systems, with the use of DC loads and distributed power generation devices, the AC-DC microgrid, which is an important component of future power distribution, has been more and more widely used. The AC-DC microgrid takes into account the characteristics of both the AC microgrid and the DC microgrid, and can more efficiently integrate distributed power sources, ...

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Abstract

The invention provides a cooperative control method for an AC-DC microgrid converter cascade system. The method comprises the steps of replacing a voltage outer loop with proportional control, enabling the bus voltage of the system to have a droop characteristic while maintaining the dynamic response of a source converter, and reducing the order of the cascade system; introducing voltage and powercooperative control, and adjusting the output impedance of the source converter and the input impedance of a load converter to improve the power transmission capability and stability of the cascade system. According to the invention, the amplitude of the output impedance of the cascade system can be reduced, the phase of the input impedance is increased, the negative effect of an LC filter on increasing the output impedance of the cascade system is eliminated, and the power transmission capability and stability of the cascade system are improved.

Description

technical field [0001] The invention relates to the technical field, in particular to a coordinated control method for a cascaded system of AC-DC micro-grid converters. Background technique [0002] In modern power systems, with the use of DC loads and distributed power generation devices, the AC-DC microgrid, which is an important component of future power distribution, has been more and more widely used. The AC-DC microgrid takes into account the characteristics of both the AC microgrid and the DC microgrid, and can more efficiently integrate distributed power sources, energy storage devices, and various loads into the grid. For this reason, it needs to use a bidirectional DC / AC converter as an interconnection transformation The cascaded system composed of interconnected converters and other DC / DC converters can realize the flexible interconnection between the AC busbar and the DC grid, and effectively improve the integration capability of the power supply system. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J5/00H02M3/158H02M7/797
CPCH02J5/00H02M3/158H02M7/797
Inventor 管西燕刘春明
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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