Wind-power electric system transient state coordination control method based on phase trajectory analysis

Abstract

The invention discloses a wind-power electric system transient state coordination control method based on phase trajectory analysis. The wind-power electric system transient state coordination controlmethod includes subjecting a system to transient state time domain simulation by taking maximum fan capacity as a basic operation point; performing homologous clustering according to acquired power angle conditions to acquire an equivalent two-machine system phase trajectory; calculating instable sensitivity matrixes when the transient state of the system is instable, sorting the matrixes in an ascending order to acquire a priority matrix, and regulating output of power generators according to the priority matrix to acquire a stable operation mode; calculating sensitivity matrixes for coordination control of the power generators when the transient state of the system is stable, and sorting the matrixes in an ascending order to acquire a priority matrix; calculating a reduced fan output value in each time period according to wind power output in a day, solving a transient state coordination control mathematic model during fan output fluctuation, and formulating transient state coordination control measures for each time period sequentially to guarantee transient state stability of the system. By the wind-power electric system transient state coordination control method, electric system dispatching staff can be guided to formulate day-ahead dispatching strategies of wind power access systems.

Description

technical field [0001] The invention belongs to the field of power system stability, and in particular relates to a transient state coordination control method for a power system including wind power. Background technique [0002] As the global energy crisis and environmental problems become more and more serious, wind power, as a clean energy source, has received more and more attention and development. Compared with traditional power generation methods, wind power output is intermittent and uncertain, which makes the operating conditions of the power system more complex and changeable; at the same time, the existing double-fed wind turbine (Double Fed Induction Generator, DFIG) and other variable-speed constant-frequency units have The dynamic characteristics are completely different from those of synchronous machines, and the connection of large-scale wind power to the grid has brought severe challenges to the transient stable operation of the power system. [0003] At p...

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Problems solved by technology

However, the algorithm based on power angle sensitivity needs to face the problem of selecting the critical power angle threshold, especially the access of new energy sources such as wind power makes the transient problem of the power grid more complicated, and the practical application of trajectory sensitivity is also facing challenges

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