Nonlinear optimization problem solving method containing differential constraint

Abstract

The invention discloses a nonlinear optimization problem solving method containing differential constraint, and belongs to the field of power system optimization operation. The method comprises the following steps: firstly, establishing a new energy unit-containing combinatorial optimization model which does not contain dynamic frequency constraint; secondly, calculating the lowest point of the dynamic frequency in each time period; and finally, comparing whether the minimum value of the primary frequency modulation frequency after disturbance in each time period meets the dynamic frequency safety limit or not, and then returning to the step 1 or terminating optimization according to the result. Two-stage optimization is adopted, a nonlinear problem containing differential constraint is decomposed into a unit combination main problem without differential constraint and a sub-problem for solving the lowest point of dynamic frequency, whether connection of the main problem and the sub-problem changes or not is judged according to whether the solution of the sub-problem meets conditions or not, and the solution of the optimization problem is obtained through repeated iteration. The method is simple and flexible in thought, the complex dynamic frequency calculation problem and the conventional unit commitment problem are decoupled, the calculation speed and performance of the model can be greatly improved, and the unit commitment problem containing the dynamic frequency constraint can be solved more quickly and effectively.

Description

technical field [0001] The invention belongs to the field of power system optimization operation, relates to a nonlinear optimization problem solution method with differential constraints, and applies it to the unit combination problem of high-proportion renewable energy power system, specifically applies it to high-proportion renewable energy Unit Combination Problems in Power Systems. Background technique [0002] Nowadays, with the development of new energy, the grid-connected scale of new energy is getting bigger and bigger. Although new energy has effectively reduced carbon emissions and environmental pollution, its unstable output has also increased the probability of power grid encountering a large power loss, and the pressure on the system's active power balance regulation has increased sharply; Inertial response of the conventional unit's online space makes the system inertia decrease. The inertia of the traditional power system dominated by thermal power is relat...

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Problems solved by technology

[0006] Aiming at the problems that the nonlinearity of the system frequency calculation formula makes the optimization constraints complicated, the conventional optimization toolbox analysis is inconvenient, and the power generation system equivalent is difficult. An Optimization Method for Dynamic Frequency Constraints in Medium

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