A control method for active grid-connected to off-grid switching based on single-phase and three-phase multi-microgrid
A control method and multi-microgrid technology, applied in the direction of single-network parallel feeding arrangement, multi-phase network asymmetry reduction, multi-phase network elimination/reduction of asymmetry, etc., can solve problems such as three-phase current imbalance
Active Publication Date: 2018-09-14
SOUTH CHINA UNIV OF TECH
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[0005] In view of the above deficiencies, the present invention aims at the problem of unbalanced three-phase current when multi-microgrids actively leave the distribution network caused by the access of single-phase microgrids. module
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[0031] The present invention will be described in further detail below with reference to the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.
[0032] Step 1: The active grid-connected to off-grid control flow chart of this example is as follows figure 1 shown. Assuming that the three-phase load in the three-phase microgrid is balanced, the power of the tie line is positive when the microgrid supplies power to the outside, and the power of the tie line of each A-phase microgrid is respectively The total power of the phase A microgrid tie line is in, 1≤i A ≤n A , and the tie line power of each B-phase microgrid is The total power of the B-phase microgrid tie line is in, 1≤i B ≤n B , and the tie line power of each C-phase microgrid is The total power of the C-phase microgrid tie line is in, 1≤i C ≤n C , set the number of photovoltaics in the A, B, and C phase microgrids of the multi-microgrid ...
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The present invention discloses an active grid-connected-to-off-network switching control method based on single-phase multiple microgrids. Aiming at the problem of unbalance three-phase current when the multiple mircrogrids actively separate from a distribution network caused by accessing the single-phase microgrids, and a single-phase microgrid connection line power regulation module and a three-phase microgrid connection line regulation module are established. The single-phase microgrid connection line power regulation module is configured to limit the output of the single-phase photovoltaic according to the three-phase unbalance degree to allow the multiple microgrids to keep three-phase current balance after off network. The three-phase microgrid connection line regulation module is configured to regulate the target regulation energy storage power according to the connection line power to allow the connection line power between multiple microgrids and the connection line to approach to zero. The active grid-connected-to-off-network switching control method based on single-phase multiple microgrids is simple and practical and can realize the control the connection line power through limiting the photovoltaic output and coordinating the three-phase energy storage system output. An active grid-connected-to-off-network switching strategy is provided to solve the problem the connection line power is unbalance when the operation of the single three-phase multiple mircogrid active grid-connected-to-off-network is performed.
Description
technical field [0001] The invention belongs to the field of grid-connected and off-grid switching, and in particular relates to a control method for active grid-connected and off-grid switching based on single-phase and three-phase multi-micro-grids. Background technique [0002] A microgrid is a small power generation and distribution system that integrates micro power sources, loads, and power electronic devices. As the link between the distribution network and distributed power, the microgrid makes it unnecessary for the distribution network to directly face different types, large quantities, scattered access or even intermittent distributed power, and is an effective way to access distributed energy. The microgrid can work in two modes: grid-connected and off-grid: the grid-connected mode that runs in parallel with the conventional distribution network; it is not connected to the external large grid or is disconnected from the large grid for some reason and becomes inde...
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IPC IPC(8): H02J3/38H02J3/26H02J3/00
CPCH02J3/0073H02J3/26H02J3/38H02J3/383H02J3/388Y02E10/56Y02E40/50
Inventor 杨苹许志荣彭嘉俊何婷张育嘉曾智基陈燿圣
Owner SOUTH CHINA UNIV OF TECH