Passive integral sliding mode control method for double-fed wind power system

A control method and passive integration technology, applied in wind power generation, electrical digital data processing, special data processing applications, etc., can solve problems such as system parameter changes, system dynamic output not in the best state, and system state uncertainty

Active Publication Date: 2015-03-11
江苏永旺新能源科技有限公司
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Problems solved by technology

The existing sliding mode control includes two parts: the arrival stage and the sliding stage. Since the sliding model of the system does not reach the sliding surface, the state of the system at the arrival stage is uncertain and easily affected by system parameter changes and external disturbances, and the dynamic output of the system is not at its optimum. good condition

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  • Passive integral sliding mode control method for double-fed wind power system
  • Passive integral sliding mode control method for double-fed wind power system
  • Passive integral sliding mode control method for double-fed wind power system

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Embodiment Construction

[0075] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0076] The passive integral sliding mode control strategy structure of doubly-fed wind power system is as follows: figure 1 As shown, the whole system adopts a double closed-loop control structure, the outer loop is the integral sliding mode speed feedback control, and the inner loop is the current feedback passive control. Generate the desired torque through the speed outer ring to get the state expectation x * , the rotor d and the q-axis voltage control value u are obtained through the current feedback passive controller rd , u rq , and then through 2 / 3 transformation and space voltage vector pulse width modulation to generate inverter IGBT drive signal, so as to realize the control of DFIG.

[0077] A kind of passive integral sliding mode control method of doubly-fed wind power system, it is characterized in that, described compensatio...

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Abstract

The invention relates to a passive integral sliding mode control method for a double-fed wind power system. The method comprises the following steps: (a) creating a Euler-Lagrange mathematical model of a double-fed wind power generator and strictly and passively analyzing the model; (b) designing a current feedback passive controller by a damp injecting method on the basis of the step (a), starting with an energy balance relationship; (c) giving an improved integral sliding mode control method, designing an integral sliding mode surface to completely eliminate the arrival phase of a general sliding mode, and taking the process as an outer ring rotating speed control strategy. The method has the advantages that the system is guaranteed to be globally stable, the control structure is simplified, and the asymptotic tracking of electromagnetic torque and magnetic flux linkage is realized; the arrival phase of the general sliding mode is eliminated, the tracking speed of the rotating speed of a double-fed motor is increased, and the robustness of the rotating speed of the double-fed motor is improved; the wind power system can be ensured to safely and stably run and a valuable reference scheme is provided for improving the working efficiency of the wind power system.

Description

technical field [0001] The invention relates to a control method for a doubly-fed wind power system, in particular to a passive integral sliding mode control method for a doubly-fed wind power system, belonging to the technical field of wind power control. Background technique [0002] With the increasingly serious energy crisis and environmental pollution, wind energy, as a green renewable energy, has been highly valued by all walks of life. Wind power generation technology has gradually matured and improved, among which the technology of variable-speed constant-frequency wind power generation with doubly-fed motors has been widely used because of its practicability and high efficiency. DFIG is a typical nonlinear, multivariable, and strongly coupled high-order system. Due to the time-varying nature of wind speed, the uncertainty of load, and the influence of mechanical damping on the speed change, the requirements for its control are constantly increasing in practical appl...

Claims

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Application Information

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IPC IPC(8): H02J3/38G06F19/00
CPCY02A30/60Y02E10/76
Inventor 李泰侯小燕盖志强赵黎曾庆军李传宏张永林杨德亮
Owner 江苏永旺新能源科技有限公司
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