Layered model predictive control (MPC)-based wind power reactive voltage synergic control system

Abstract

The invention discloses a layered model predictive control (MPC)-based wind power reactive voltage synergic control system. The layered MPC-based wind power reactive voltage synergic control system comprises an adaptive adjustment layer, a reactive power allocation layer and a real-time control layer, wherein the an adaptive adjustment strategy of a grid-connected voltage is proposed by the adaptive adjustment layer according to adjustment capability of a wind power plant and fluctuation track predication of the grid-connected point voltage, an improved proportion allocation strategy capable of considering reactive power adjustment margin of each machine set is given out by the reactive power allocation layer on the basis of solving reactive power demand capacity, and a control error is corrected in real time by the real-time control layer according to state prediction and reference and feedback information. By layered MPC, predication information of different time levels in each layercan be effectively utilized, control on different time scales of each layer can be effectively coordinated, and the effectiveness of the proposed method is verified by a PSCAD-based simulation analysis result.

Description

technical field [0001] The invention relates to the technical field of layered coordinated control of reactive power and voltage of wind farms, in particular to a layered MPC-based wind power reactive voltage coordinated control system. Background technique [0002] Affected by the distribution of wind resources, a large number of large-scale wind farms are far away from the load center and connected to the end of the power grid, showing a weak connection with the system, lacking strong and effective support from the system side. As a result, its voltage regulation is easily affected by fluctuations on the wind farm side and the system side, which is a key issue in the grid-connected operation of friendly wind farms. [0003] As the current mainstream wind farm model, the double-fed induction generator (DFIG) itself has a certain dynamic reactive power compensation capability, and its reactive power adjustment capability should be fully utilized in the voltage control of the...

AI Technical Summary

Problems solved by technology

[0005] First of all, the existing MPC voltage control lacks the consideration of reactive power coordination and distribution among wind turbines and the possible insufficient reactive power adjustment ability, and the insufficient reactive power adjustment ability can easily cause control failure

[0006] Secondly, in the existing wind power voltage control, the active power prediction information is not considered enough or the processing is relatively rough, especially for the influence of prediction error, or it is not taken into account, or it is too conservative, which needs further detailed research

[0007] Finally, in terms of reactive power distribution of units, the equal proportion method is often used. This method is likely to cause saturation of units with large active power output, while units with low active power output cannot fully exert their reactive power adjustment capabilities.

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