Weight-free multivariable sequence model prediction control method and device for LCL type inverter

A model predictive control, multi-variable technology, applied in the output power conversion device, circuit device, AC power input into DC power output and other directions, can solve the problem of difficulty in selecting weights and other issues

Inactive Publication Date: 2020-09-01
CHINA UNIV OF MINING & TECH
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  • Abstract
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Problems solved by technology

However, the existing multivariable control system needs to set multiple weight coefficients, and it is difficult to choose the appropriate weight

Method used

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  • Weight-free multivariable sequence model prediction control method and device for LCL type inverter
  • Weight-free multivariable sequence model prediction control method and device for LCL type inverter
  • Weight-free multivariable sequence model prediction control method and device for LCL type inverter

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Embodiment Construction

[0062] Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0063] In the embodiment of the present invention, the LCL type inverter has no weight value multivariable sequential model predictive control method as follows: figure 1 As shown, including stratification of multi-variables, followed by prediction and optimization;

[0064] Calculate the predicted value of the upper variable in the initial optimization space, and substitute the predicted value into the variable cost function to sort from small to large;

[0065] Select part of the predicted value of the upper variable as the optimization space of the lower variable;

[0066] The lower-level variables are then subjected to prediction value calculation and cost functio...

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Abstract

The invention discloses a weight-free multivariable sequence model prediction control method and device for an LCL type inverter. According to the method, control over multiple variables such as the midpoint potential of the direct current side, the output current of the inverter, the voltage of a filter capacitor and the grid-connected current can be achieved by establishing a detailed predictionmodel. Aiming at the problem that reasonable weight coefficients are difficult to select in traditional multivariable model prediction control, the method performs step-by-step prediction evaluationon each variable, only calculates one variable in each step, screens out a part of optimal solution as a feasible region, substitutes the feasible region into prediction evaluation of a next variable,and finally screens out an optimal control target. According to the control method, weight coefficients do not need to be allocated to the variables, the optimization space is reduced, the calculatedamount is reduced and the control response speed is improved in the step-by-step evaluation process, and the LCL three-level inverter controlled by the method has a good output effect.

Description

technical field [0001] The invention relates to the technical field of multi-level inverter control, in particular to a weightless multi-variable sequential model predictive control method and device for an LCL inverter. Background technique [0002] With the development of photovoltaic, wind energy and other new energy power generation systems, grid-connected inverters have been widely used as key connection equipment. Compared with traditional inverters, three-level inverters have the advantages of high voltage resistance and low harmonic content of output voltage and current, and are widely used in high-voltage and high-power occasions. At the same time, compared with the L-type inverter, the LCL-type inverter not only requires a smaller inductance, but also can well suppress the high-frequency harmonics caused by the switching action, and the distortion rate of the output current is lower. Therefore, the LCL three-level neutral-point clamped inverter, as an ideal struct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483H02M7/5387H02J3/38
CPCH02J3/381H02M7/483H02M7/53871H02J2203/20H02J2300/20H02J2300/22H02J2300/28
Inventor 张辉李枝亮刘业钊谌金利史军伟张晓
Owner CHINA UNIV OF MINING & TECH
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