A Mixed Integer Convex Programming Method for Optimal Power Allocation of AC-DC Parallel Transmission Channels

Abstract

The invention discloses a mixed integer convex programming method for optimal power distribution of AC / DC parallel transmission channels, based on the active power generation dispatching plan of the whole grid generator set and the active power transmission plan of the DC transmission line, by means of processing methods of cone relaxation transformation and large M method equivalence, the objective function and constraint conditions with high nonlinearity are subjected to convexification processing, the established optimization model is transformed into a mixed integer convex programming model which is easy to solve, the obtained optimal power allocation scheme of AC / DC transmission channel can effectively reduce the loss of AC and DC transmission channels, obvious economic benefits are achieved, and the mathematical optimization of the solution is ensured, and the solving efficiency of optimization calculation is improved, so as to achieve the operation economy of AC / DC interconnected power network.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a mixed integer convex programming method for optimal distribution of AC-DC parallel transmission channel power. Background technique [0002] Due to the uneven distribution of energy and load, long-distance, large-capacity, EHV / UHV power transmission has become the development trend of my country's power grid. Regional power grids such as Southern Power Grid and East China Power Grid have formed a large-scale AC-DC interconnected grid pattern. At present, the "West-to-East Power Transmission" channel of China Southern Power Grid covers five southern provinces (regions), starting from Yunnan and Guizhou provinces, passing through the whole territory of Guangxi, and arriving in Guangdong. Sending to Guangdong plays an important role in the optimization and rational allocation of power resources in the five southern provinces and regions, as well as the economic and social ...

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Problems solved by technology

Therefore, the optimal distribution of AC-DC parallel transmission channel power belongs to the mixed integer nonlinear programming model, which is difficult to solve. It is often difficult to obtain the optimal solution by using a commonly used mixed integer nonlinear programming solver such as SBB and it is difficult to guarantee that the obtained solution is in Mathematical optimality and slow solution speed

[0006] The disadvantages of the above-mentioned technologies are: the conventional calculation method for optimal allocation of power in parallel AC-DC transmission channels does not take into account the stepwise processing of the transmission plan of the DC transmission channel directly in the optimization calculation, and the calculation of the DC transmission channel after the optimization calculation The power transmission plan is processed in steps, so the optimization degree of the power optimal allocation scheme obtained in this way is often poor; directly introduce the optimal allocation model of AC-DC parallel transmission channel power required by the step-wise transmission plan of the DC transmission channel, involving trigonometric functions and quadratic functions It is a mixed integer nonlinear programming model, and it is difficult to solve it. It is often difficult to solve it with commonly used mixed integer nonlinear programming solvers such as SBB. The optimal solution and it is difficult to guarantee the mathematical optimality of the obtained solution, and the solution speed is slow

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