Multi-machine system difference adjustment coefficient optimization method based on sensitivity analysis

Abstract

The invention discloses a multi-machine system difference adjustment coefficient optimization method based on sensitivity analysis, and the method comprises the steps: firstly obtaining the track sensitivity of a difference adjustment coefficient R, an inertia time constant M and a load damping coefficient D to the frequency deviation of a power system, analyzing the impact on the maximum frequency deviation from the track sensitivity of all parameters, and determining a dominant parameter of the maximum frequency deviation as a difference adjustment coefficient R; establishing a mathematicalmodel of difference adjustment coefficient R optimization, and converting a nonlinear optimization problem of the established mathematical model into a linear programming problem by adopting a sensitivity analysis method; and optimizing and sequencing the units according to the sensitivity of the difference adjustment coefficients of the units of the power system, and optimizing the difference adjustment coefficients of the units in sequence. The method can guarantee the output stability of the synchronous unit while meeting the system frequency stability, and fully excavates the frequency modulation capability of the synchronous unit.

Description

technical field [0001] The invention relates to the technical field of synchronous unit parameter optimization, in particular to a sensitivity analysis-based multi-machine system error coefficient optimization method. Background technique [0002] With the expansion of new energy access to the power grid, new energy units replace synchronous units, resulting in a decrease in the equivalent inertia of the power system. At the same time, the formation of UHV AC and DC power grids increases the risk of large power disturbance shortages, and the transient frequency of the power grid is stable. Sex is under threat. At present, most of the frequency regulation requirements in the power system are borne by synchronous units. How to suppress the transient frequency deviation by tapping the frequency regulation capabilities of synchronous units is an important issue to ensure the safe and stable operation of the power system. [0003] The frequency response of the synchronous unit i...

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Problems solved by technology

With the continuous grid connection of intermittent power sources such as wind power and photovoltaics and the extensive application of power electronic equipment, the diversity and complexity of actual power system operation modes have increased dramatically, and analytical analysis methods have been difficult to meet the needs of parameter optimization. There are many generator nodes in China, which are affected by factors such as grid structure and disturbance position. Adjusting the parameters of generator governors at different positions will have different effects on improving the system frequency response. Therefore, it is suitable for speed regulation of multi-machine systems. The parameter optimization method needs to be further studied

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