Dynamic frequency division wind power generation system with autonomous inertia response

Abstract

The invention relates to a dynamic frequency division wind power generation system with autonomous inertia response. The system comprises a wind power plant, a wind power plant step-up transformer, alow-frequency alternating-current power transmission line, a power transmission step-down transformer, a winding rotor asynchronous motor, an electric excitation synchronous motor, an excitation system and a control unit thereof, a coupling unit, a double-alternating-current-port frequency converter, a frequency converter controller, a grid-connected device, switching equipment, a step-down transformer, a starting resistor, a detection unit and a central controller. Compared with the systems in the prior art, the synchronous motor in the isolated variable-frequency transformer is used as the power grid interface and the whole system shows the characteristics of the synchronous generator for the power grid and facilitates stable operation of the system. In addition, after the whole system is started, the winding rotor asynchronous motor provides centralized frequency conversion for the wind power plant under the control of the dual-port alternating-current frequency converter, the converged electric energy of the wind power plant drags the electrically excited synchronous motor to operate at the synchronous rotating speed and the characteristic of power grid friendliness is achievedunder the cooperation of the excitation system and the control unit of the excitation system.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a dynamic frequency division wind power generation system with autonomous inertia response. Background technique [0002] In the currently commonly used wind power grid-connected control technology, the wind turbines do not reflect the inertia of the grid, resulting in a decrease in the equivalent inertia of the power system, which is not conducive to system stability. The existing improvement measures participate in the system frequency response by adding droop control, or use the virtual synchronous machine control to simulate the external characteristics of the synchronous machine. [0003] The most similar realization scheme to the present invention is to use the synchronous motor in the rotary frequency division transformer to centrally convert the frequency of the entire wind farm, wherein the speed of the synchronous motor is controlled by the wound rotor mot...

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Problems solved by technology

Therefore, in this scheme, the entire wind farm is represented as a large-capacity double-fed unit to the power grid, which still cannot provide active support to the power grid

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