Alternating-current receiving end grid direct-current receiving scale calculation method

Abstract

The invention provides an alternating-current receiving end grid direct-current receiving scale calculation method. The method comprises the following steps: 1, a set L1 in which the short-circuit current level satisfies set conditions is obtained; 2, a bus set L2 in which the influences of the disconnection of an alternating-current circuit connected with some bus on direct-current system MISCR are less than set influences is screened out; 3, an intersection set L of the set L1 and the set L2 is obtained; 4, any i buses are selected from the set L so as to be fed into the direct-current system, and each direct-current MISCR value in the optimal scheme is judged whether to be less than the minimum limit value, if each direct-current MISCR value in the optimal scheme is less than the minimum limit value, then the process enters the step 5, or else the process enters the step 7; 5, the direct-current system maximum power value which can be accepted on the i direct-current fall point buses is calculated in the condition that the MISCR value of the direct-current system is not less than the minimum limit value and the direct-current power does not exceed the maximum power limit value; 6, i=i+1, and when i is judged to exceed the total number of elements, the step 7 is executed, or else, the step 4 is executed; 7, and the alternating-current receiving end grid direct-current receiving scale is obtained. The calculation method provided in the invention has advantages of simplicity and good operability, and a direct guidance scheme can be provided for planners.

Description

technical field [0001] The invention relates to the field of power system planning and design, in particular to a method for calculating the scale of DC power receiving in an AC receiving end power grid. Background technique [0002] The DC receiving-end scale of the AC grid has always been an important issue in the field of power system planning and operation. For the receiving-end grid with multiple DC-intensive feeds, there is a lack of effective and convenient calculation methods for the DC power receiving scale of the AC receiving-end grid. In actual work, the planning and design personnel usually determine the number of DC feeds and the transmission capacity of each DC by means of tests based on the needs of power transmission and reception combined with experience. On this basis, according to the multi-feed short-circuit ratio MISCR A limited number of multi-DC drop-point schemes are formulated, and then repeated security and stability calculations and analyzes are pe...

AI Technical Summary

Problems solved by technology

Since there are many multi-circuit DC drop-point combination schemes in a certain number of DC transmission systems, and the combination of the transmission scale of different DC systems needs to be considered, and the number of feed-in DC systems needs to be continuously increased during the trial calculation process, so the preparation The selected calculation schemes increase exponentially, and the workload is huge; it is difficult to calculate, evaluate and compare all possible schemes in actual operation, which greatly affects the credibility of the conclusions obtained and brings huge challenges to power grid planning. There is an urgent need to improve the technical capabilities of building AC-DC hybrids under multi-DC conditions, and solve the practical problems of calculating the DC power receiving scale of the AC receiving end grid

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