A Method for Optimizing the Partition Scale and Connection Scheme of Multi-DC Feeding and Receiving-End Power Grids
A technology of multiple DC feed-in and receiving-end power grids, which is applied in the direction of AC network circuits, electrical components, circuit devices, etc., and can solve problems such as difficulty in simultaneous coordination
Active Publication Date: 2018-12-07
GRID POWER PLANNING & RES CENT OF GUANGDONG GRID POWER CO LTD +1
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Problems solved by technology
This type of method has great limitations. For example, the grid partition scale and the connection scheme are two factors that interact with each other: under the condition of strong internal connection within the partition, it may be possible to realize more grid partitions, thereby increasing the system accident rate to a greater extent. Range control ability. Similarly, changing the internal connection scheme under the same partition size may also be able to further improve the safety performance of the power grid. It is difficult to coordinate various factors at the same time to obtain a better scheme.
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[0058] The accompanying drawings are for illustrative purposes only, and should not be construed as limitations on this patent; in order to better illustrate this embodiment, certain components in the accompanying drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art It is understandable that some well-known structures and descriptions thereof may be omitted in the drawings. The positional relationship described in the drawings is for illustrative purposes only, and should not be construed as a limitation on this patent.
[0059] figure 1 Execution process of the invented method for optimizing the grid partition scale and connection scheme.
[0060] figure 2 Calculation and execution process of power outage risk indicators based on non-sequential MCS.
[0061] by image 3 Take the 4 (n=4) node system shown as an example, assuming that the connection relationship between nodes 3 and 4 has been deter...
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The invention discloses a method for optimizing district scale and connecting plan of a multi-infeed DC receiving-end power grid, wherein minimizing a large-scale power supply stoppage accident probability is used as a target. A series of constraints of power supply balance, single power supply ratio, multi-infeed DC shortcircuit ratio and normal mode state are considered, and a mathematical model which corresponds with a power grid district scale and connecting plan optimization problem is constructed. Through considering a network grid actual construction condition and planning working focusing key points, a variable expression method which represents the power grid district scale and the connecting plan is presented based on a least unit, and a connecting plan between two least units is used as a to-be-calculated variable. A heuristic algorithm and sound searching are used for solving the developed mathematical model. The invention provides the method for quantitatively and finely performing grid shape and structure planning research of the multi-infeed DC receiving power grid, and the plan for optimizing district scale and connecting of the power grid is obtained in a power failure risk control aspect.
Description
technical field [0001] The invention belongs to the technical field of power system planning, and in particular relates to a multi-direct current feed-in receiving-end power grid partition scale and a method for optimizing connection schemes. Background technique [0002] Multiple DC feed-in and receiving-end power grids often have the characteristics of large-scale, high-strength connections, and tight grid coupling. On the one hand, this is an objective requirement for the system to have a certain degree of adequacy, to meet stability constraints, and to operate safely in DC. On the other hand, it also leads to problems such as prominent system interaction and difficult control of power outage risks. Among them, rationally controlling the scale of the synchronous power grid and optimizing the grid connection scheme are one of the measures to improve the multi-DC feed-in receiving-end power grid to deal with complex faults and prevent large-scale power outages caused by AC-...
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IPC IPC(8): H02J3/00H02J3/38
CPCH02J3/00H02J3/381H02J2203/20
Inventor 杨燕徐蔚程鑫林勇左郑敏吴强余梦泽李作红
Owner GRID POWER PLANNING & RES CENT OF GUANGDONG GRID POWER CO LTD