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Double-fed fan voltage regulation method based on double-layer model predictive control

A technology of model predictive control and doubly-fed wind turbines, applied in the direction of controlling generators, control systems, generator control circuits, etc., can solve the problem of not considering the influence of wind turbine control dynamics

Active Publication Date: 2020-06-05
INNER MONGOLIA POWER GRP +1
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Problems solved by technology

At present, there are related researches based on model predictive control method to solve the problem of voltage control of wind farm grid-connected points, but most of them do not consider the influence of wind turbines' own control dynamics

Method used

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  • Double-fed fan voltage regulation method based on double-layer model predictive control
  • Double-fed fan voltage regulation method based on double-layer model predictive control
  • Double-fed fan voltage regulation method based on double-layer model predictive control

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specific Embodiment

[0111] For the proposed control strategy, we use image 3 The wind farm send-out system shown was verified. Among them, system parameters and controller parameters are shown in Table 1 and Table 2.

[0112]

[0113] Table 1 Simulation coefficient parameters

[0114]

[0115] Table 2 Model Predictive Control Parameters The following two scenarios are simulated and verified: 1) at t=1s, the DC transmission power is reduced by 200MW; 2) at t=1s, the DC is blocked and the DC transmission power is 0. The simulation compares the voltage response of the grid-connected point of the wind farm and the change of active power output between the proposed control strategy and the unit power factor control method without reactive power control in the two scenarios. The simulation results are as follows: Figure 4 , Figure 5 shown. From Figure 4 It can be seen that: 1) In the scenario where the wind farm is weakly connected to the grid, the change of the active output of the wind...

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Abstract

The invention discloses a double-fed fan voltage regulation method based on double-layer model predictive control. The method comprises the following steps of firstly, establishing a double-layer model predictive control framework, and establishing a system frequency voltage response and fan rotor inner ring prediction model based on a system frequency, a fan grid-connected point voltage and the dynamic state of a double-fed fan rotor inner ring; for an upper-layer wind field model prediction controller, designing and solving the corresponding optimization problems the under normal and emergency working conditions to obtain the reference values of the active power and reactive power of a wind field; and designing and solving a corresponding optimization problem for a lower-layer doubly-fedfan rotor side model prediction controller so as to effectively track an upper-layer power reference instruction. According to the method, the wind field participates in grid-connected point voltageregulation through a double-layer model prediction control strategy, the grid-connected point voltage changes are responded in time under the normal and emergency working conditions, and then the windfield voltage controllability and the system voltage stability are improved, and the technical support can be provided for the participation of the double-fed fan in the voltage regulation and the design of a voltage ride-through controller of the double-fed fan.

Description

technical field [0001] The invention relates to a double-fed fan pressure regulation method based on double-layer model predictive control, in particular to a double-fed fan pressure regulation method based on double-layer model predictive control considering active-reactive power coordinated control. Background technique [0002] With the deepening of wind power technology and the continuous expansion of wind farm scale, the fluctuation and uncertainty of wind power generation have a great impact on the operation of the system, and also bring technical challenges to the system voltage stability. Since many large wind farms are far away from the receiving end grid, the status quo of wind farms being weakly connected to the grid is formed. In the weakly connected scenario, the intermittent power of the wind farm is likely to cause considerable voltage fluctuations. In addition, grid disturbances may also cause cascading trips of wind turbines. Therefore, grid connection of m...

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Application Information

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IPC IPC(8): H02J3/16H02J3/38H02P9/10H02P101/15
CPCH02J3/16H02P9/007H02P9/105H02P2101/15Y02E40/30
Inventor 李丹丹张爱军汪震周昌平邢华栋刘石川
Owner INNER MONGOLIA POWER GRP
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