A Fan Frequency Modulation Control Method Based on Power Disturbance Value Response

Abstract

The invention belongs to the technical field of new energy power generation of a power system, and particularly relates to a power disturbance value response-based frequency modulation control method of a draught fan. The frequency modulation control method comprises the following steps of 1, performing load-reduction running of a wind power plant, and providing frequency modulation rotation reserve for a power grid; 2, monitoring a power balance and standby state of the power grid and the power wind plant in real time when the wind power plant normally runs; 3, judging whether a frequency modulation measure of the wind power plant is triggered or not when a power of the power grid abruptly changes; 4, selecting the wind power plant participating in frequency modulation according to electrical distance between the wind power plant and a disturbance node; 5, calculating emergency power support capacity of the wind power plant; and 6, performing emergency power control. By the frequency modulation control method of the draught fan, the transient frequency deviation amplitude and the frequency recovery time after disturbance of the system can be reduced; and meanwhile, compared with traditional droop control of the draught fan, the frequency modulation control method has the advantages of higher controllability and rapidness, and a technical support is provided for improving wind power absorption capability.

Description

technical field [0001] The invention belongs to the technical field of power system new energy power generation, and in particular relates to a fan frequency modulation control method based on power disturbance value response. Background technique [0002] A high proportion of wind power access brings severe challenges to the power balance and frequency stability of the grid. Because mainstream variable-speed variable-pitch wind turbines achieve decoupling control of system frequency and fan speed, they cannot respond to changes in system frequency. Therefore, large-scale wind power access will reduce the system inertia level, resulting in reduced frequency regulation capabilities. Especially when the wind farm supplies power to the low-voltage distribution network, the frequency problem caused by the random fluctuation of the output power of the wind farm is more prominent. Therefore, more and more power grid operation regulations require the wind farm to provide auxiliary ...

AI Technical Summary

Problems solved by technology

The high-frequency cut-off scheme based on the dominant wind farm cannot avoid the impact on the grid caused by the cut-off unit and the wind turbine re-connected to the grid; combined with the droop control of the proportional-differential controller, although the simulated inertial response of the wind turbine can be achieved, it is too dependent on the real-time system frequency Therefore, the fan output power fluctuates greatly during the frequency modulation process, which lacks controllability, and the droop control parameter design is not easy

Images