Generator excitation difference adjustment coefficient optimization setting method considering voltage stabilization

Abstract

The invention relates to the technical field of optimization and setting of generator excitation difference adjustment coefficients, and in particular relates to a generator excitation difference adjustment coefficient optimization setting method considering voltage stabilization. According to the method, the voltage stability margin is used as a constraint, and the minimum value of one norm of the reference voltage correction amount of the generator is used as a target, the characteristic that the power generator cannot maintain the reference voltage due to the limitation of the reactive capacity is simulated, the relation between the reactive power, the voltage and the difference adjustment coefficient of the generator is analyzed and expressed, and an optimized setting model of the difference adjustment coefficient is established. A user can give the setting value of the difference adjustment coefficient according to the set stability margin. Compared with an existing method, the method disclosed by the invention has the advantages that the calculation efficiency is high, the actual requirements such as voltage stabilization are comprehensively considered, and the method has relatively strong practical value.

Description

technical field [0001] The invention relates to the technical field of optimal setting of generator excitation adjustment coefficient, in particular to an optimal setting method of generator excitation adjustment coefficient considering voltage stability. Background technique [0002] In order to solve the problem of "source-load isolation" in China and realize cross-regional, long-distance and large-scale power transmission, my country has successively built a number of (Ultra) high-voltage AC and DC lines, and respectively built "eight alternating and eight direct" and "eight alternating and nine "straight" (ultra) high-voltage AC-DC transmission backbone network. In the AC-DC system, once the DC system has a DC emergency blocking, the compensation capacitor of the converter station may be removed jointly, which will reduce the dynamic reactive power reserve of the entire system and cause a drop in the voltage of the power grid at the sending and receiving end. Multiple 50...

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Problems solved by technology

The optimization model established in the article "Optimization and adjustment of the difference adjustment coefficient of generator excitation system based on the power grid operation data set [J]. Power Grid Technology, 2017, 41(02): 508-513" has not considered restrictions such as voltage stability margins, and the solution Although the intelligent algorithm based on it does not need to analyze and express the optimization model, and it is not limited by non-convex and non-smooth problems in global optimization, it is very sensitive to the setting of algorithm parameters, and its robustness is generally worse than that of mathematical programming methods. Obtain the global optimal solution with a low probability, and the uncertainty of each calculation result is also easy to cause trouble for users

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