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Multi-step model prediction control method for VSC rectifier station connected with wind power plant

A technology of model predictive control and model prediction, applied in wind power generation, power transmission AC network, electrical components, etc., can solve the problems of many setting parameters, difficult practical application, complex decoupling structure, etc., and achieve delay compensation and enhanced The effect of anti-disturbance ability

Active Publication Date: 2021-09-28
HUBEI UNIV OF TECH
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Problems solved by technology

The traditional PI control strategy has a complex decoupling structure, many parameters to be tuned, slow response speed, and is easy to interact with PI controllers of double-fed fans
Model predictive control eliminates the PI controller, does not require pulse width modulation, is simple in design, and has a fast response speed. However, the traditional one-step model predictive control derives the model predictive formula at (k+1) time at time k, constructs the objective function, and uses The objective function is minimized to obtain the optimal switch state at time k for the optimization goal, ignoring the delay error caused by the measurement and calculation time, which is difficult for practical application

Method used

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  • Multi-step model prediction control method for VSC rectifier station connected with wind power plant
  • Multi-step model prediction control method for VSC rectifier station connected with wind power plant
  • Multi-step model prediction control method for VSC rectifier station connected with wind power plant

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Embodiment Construction

[0033] Firstly, the principle of the method of the present invention is introduced.

[0034] Firstly, the two-step model prediction function of WF-VSC AC bus voltage is derived.

[0035] according to figure 1 The shown WF-VSC topology and reference direction, combined with Kirchhoff’s voltage and current law, the continuous mathematical model of WF-VSC in three-phase static coordinates can be obtained as

[0036]

[0037] where u k is the AC bus voltage at the wind farm side, i k is the three-phase AC current flowing into the VSC rectifier, i w is the AC current at the outlet of the wind farm, u dc It is the DC voltage of the rectifier side, k=phase a, phase b, phase c, g k is the switching function of the bridge arm of the kth phase of the rectifier.

[0038] switch function g k It reflects the switching state of each phase bridge arm of the rectifier, which is defined as formula (2).

[0039]

[0040]

[0041] According to the Clark formula (3), the three-ph...

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Abstract

The invention relates to a multi-step model prediction control method for a VSC rectifier station connected with a wind power plant. The method comprises the following steps of: constructing a two-step model predictive control discrete mathematical model according to a topological structure of the VSC rectifier station (WF-VSC) connected with the wind power plant; introducing future reference value prediction to construct a corresponding objective function by taking stabilization of alternating current bus voltage at the wind power plant side as a control objective; and designing to obtain a WF-VSC two-step model prediction controller. According to the method, the defects that a traditional PI control strategy is complex in decoupling structure, needs a large number of setting parameters, is low in response speed and is prone to mutual influence of double-fed fan PI controllers are overcome, and time delay errors generated by measurement and calculation in one-step model prediction control can be compensated. The method is high in response speed and high in control precision, improves the electric energy quality of the AC bus voltage and the robustness of a control system, and can improve the anti-interference capability of the system when a DC side voltage fluctuates due to the introduction of DC capacitor current feedforward.

Description

technical field [0001] The invention belongs to the technical field of electric power engineering. Specifically, it relates to a multi-step model predictive control method for a VSC rectifier station connected to a wind farm. Background technique [0002] Due to the randomness and intermittent nature of wind energy, the output power of wind power generation has large fluctuations. The VSC rectifier station (WF-VSC) connected to the wind farm must realize the stable control of the AC bus voltage of the wind farm for the transmission of wind energy and grid connection. Provide the basis. The traditional PI control strategy has a complex decoupling structure, many parameters to be tuned, slow response speed, and is easy to interact with PI controllers of double-fed fans. Model predictive control eliminates the PI controller, does not require pulse width modulation, is simple in design, and has a fast response speed. However, the traditional one-step model predictive control d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/36
CPCH02J3/381H02J3/36H02J2203/20H02J2300/28Y02E60/60
Inventor 余瑜田野汪健杨文康
Owner HUBEI UNIV OF TECH
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