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A full power conversion wind turbine control system with energy storage and its control method

A wind turbine and control system technology, applied in the electrical field, can solve problems such as small signal instability, different power flow directions, output current limitation, etc., and achieve the effect of improving small signal stability

Active Publication Date: 2022-07-22
NANTONG UNIVERSITY
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of output current limitation and small signal instability when the full-power wind turbine with energy storage adopts the inertial synchronous voltage source control strategy, and avoid the current inner loop of the wind turbine under the condition of output current limitation. Saturation of the wind turbine to maintain the voltage source characteristics of the wind turbine under the condition of output current limitation; in addition, according to the different power flow directions when the energy storage unit releases and absorbs energy, different stability control strategies are formulated to improve the wind turbine from the side of the energy storage unit. small signal stability

Method used

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  • A full power conversion wind turbine control system with energy storage and its control method
  • A full power conversion wind turbine control system with energy storage and its control method
  • A full power conversion wind turbine control system with energy storage and its control method

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Embodiment Construction

[0045] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments.

[0046] Many specific details are set forth in the following description to facilitate a full understanding of the present invention, however, the present invention may also be implemented in other ways than those described herein, and therefore, the present invention is not limited to the specific embodiments of the following disclosure. limit.

[0047] see Figure 2-Figure 3 , an embodiment of the present invention - a block diagram of a grid-side converter control of a full-power wind turbine with energy storage, a full-power conversion wind turbine control system with energy storage, including a grid-side converter, a machine-side converter and an energy storage unit ; The grid-side converter is integrated into the power grid through an LCL filter, and the grid-...

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Abstract

The invention provides a full power conversion wind turbine control system and method including energy storage. The grid side converter adopts reactive power control and DC voltage control outer loop, AC side voltage control middle loop, and output current control inner loop. The virtual resistance control and limiter links are added to the voltage control loop, so that the grid-side converter has the function of current limiter without causing saturation of the current inner loop, avoiding the influence of the saturation phenomenon in the current control inner loop under the traditional limiter control. Voltage source characteristics of the converter. Aiming at the different power flow directions when the energy storage unit releases and absorbs energy, a stable control strategy is proposed to switch autonomously with the energy storage power flow to improve the small-signal stability of wind turbines with energy storage.

Description

technical field [0001] The invention belongs to the field of electrical technology, in particular to the technical field of electrical control of wind turbines, and in particular to a control system and a control method for a full-power conversion wind turbine with energy storage. Background technique [0002] Add an energy storage device to the DC side of the full-power wind turbine, as shown in the appendix figure 1 As shown, the wind turbine includes a grid-side converter, a machine-side converter and an energy storage converter. In order to cope with a high proportion of wind power grid-connected, wind turbines are required to have the ability to actively support the grid, participate in grid regulation, and operate stably. At present, based on the inertial synchronous voltage source control strategy, the wind turbine can present the characteristics of a voltage source to the power grid and realize the active support function for the power grid; additional inertia trans...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/32H02J3/24H02M7/48H02M1/32
CPCH02J3/381H02J3/32H02J3/24H02M7/48H02M1/32H02J2300/28Y02E10/76
Inventor 桑顺薛晓岑张雷黄杰杰
Owner NANTONG UNIVERSITY
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