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Master-slave control strategy microgrid-based main power supply double-mode running control method

A control strategy and operation control technology, applied in the direction of parallel operation of DC power supply, single-network parallel feeding arrangement, etc., can solve problems such as overvoltage or overcurrent, seamless switching failure, etc., and achieve smooth transition process and constant output. It will change suddenly and ensure the effect of uninterrupted power supply

Active Publication Date: 2011-09-14
TIANJIN UNIV
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Problems solved by technology

[0008] The sudden change in the output voltage amplitude and phase of the inverter before and after switching the main power bidirectional inverter operating mode and control mode in the microgrid can easily cause problems such as overvoltage or overcurrent during the switching process, resulting in seamless switching failure

Method used

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  • Master-slave control strategy microgrid-based main power supply double-mode running control method
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  • Master-slave control strategy microgrid-based main power supply double-mode running control method

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Embodiment Construction

[0020] The technical solution of the present invention will be further described in detail according to the accompanying drawings in the description.

[0021] A microgrid system based on a master-slave control strategy such as figure 1 As shown in the figure, the distributed power supply (including the main power supply and the slave power supply) in the microgrid is connected to the AC bus in the microgrid through the three-phase inverter. The microgrid is connected to the power grid through a static switch (STS). When the switch is closed, the microgrid runs in parallel with the grid. The load in the microgrid can be powered by the distributed power supply and the grid at the same time. If the output of the distributed power supply is greater than the load, it can also be sent to the grid. When the switch is turned off, the microgrid enters the independent operation mode, and the load in the microgrid is independently powered by the distributed power supply in the microgrid....

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Abstract

The invention relates to a master-slave control strategy microgrid-based main power supply double-mode running control method which belongs to the technical field of distributed power generation. The method comprises the following steps of: when switching from an independent running mode to a grid-connected running mode, switching a control manner from voltage and current double-ring control intocurrent closed ring control and memorizing a voltage ring output result before switching as switched current ring reference input; memorizing a current ring output result before switch as an initial value of a switched current ring output result; when switching from the grid-connected running mode into the independent running mode, switching the control manner from current closed ring control into voltage and current double-ring control and memorizing a current ring reference input command before switch as an initial value of a switched voltage ring output result; and memorizing the current ring output result before switch as the initial value of the switched current ring output result. The control method provided by the invention can ensure that all output quantities of a two-way inverter can not be mutated, and the microgrid system transient process is smoother.

Description

technical field [0001] The invention belongs to the technical field of micro-grid systems for distributed power generation and energy supply, and relates to a main power supply dual-mode operation controller of the micro-grid. Background technique [0002] In recent years, under the dual pressure of energy demand and environmental protection, distributed generators (DG) such as photovoltaics, wind power, micro gas turbines, fuel cells, batteries and flywheel energy storage have gained more and more attention and applications. . Connecting the distributed power generation to the large power grid in the form of a micro-grid for grid-connected operation and supporting each other with the large power grid is the most effective way to maximize the benefits of the distributed power generation system. Microgrid refers to a small power generation and distribution system composed of distributed power sources, energy storage devices, energy conversion devices, related loads, and moni...

Claims

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Application Information

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IPC IPC(8): H02J3/44H02J1/10
Inventor 郭力王成山李霞林张野刘梦璇焦冰琦
Owner TIANJIN UNIV
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