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Grid-connected inverter MPC method based on prediction deviation feedback correction

An inverter and deviation technology, applied in the field of grid-connected inverter MPC based on predictive deviation feedback correction, can solve problems such as aggravation of grid-connected current distortion, and achieve improved robustness, reduced THD, and good current tracking effect. Effect

Active Publication Date: 2017-12-01
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0004] Purpose of the invention: Aiming at the shortcomings of the existing technology, a grid-connected inverter MPC method based on prediction deviation feedback correction is proposed to solve the problem of aggravated grid-connected current distortion when the system parameters do not match, and improve the robustness of the system

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  • Grid-connected inverter MPC method based on prediction deviation feedback correction
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  • Grid-connected inverter MPC method based on prediction deviation feedback correction

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[0039] The present invention will be further explained below in conjunction with the accompanying drawings.

[0040] A grid-connected inverter MPC method based on prediction deviation feedback correction, comprising the following steps:

[0041] Step 1. Sampling the three-phase grid voltage u sa , u sb , u sc and grid current i a i b i c , through the Clark transformation, the grid voltage u in the two-phase static coordinate system is respectively obtained sα , u sβ and grid current i α i β ;

[0042] Step 2. Obtain the grid voltage vector angle θ through the phase-locked loop 7, and use the voltage vector angle θ to measure the grid voltage u in the two-phase static coordinate system sα , u sβ Perform Park transformation to obtain the d and q components u of the grid voltage in the synchronous rotating coordinate system d , u q ;

[0043] Step 3: Sampling the capacitor voltage u on the DC side dc , the given value of the d-axis component of the grid-connected ...

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Abstract

The invention discloses a grid-connected inverter MPC method based on prediction deviation feedback correction. The method adopts a voltage outer loop control unit, a current inner loop MPC control unit, and a phase-locked loop unit to obtain the grid voltage vector angle Theta to realize the coordinate transformation; according to the DC side capacitor voltage of the PWM converter, the voltage outer loop unit outputs a given grid-connected current represented in the figure of the abstract; and the current inner loop MPC control unit obtains the voltage vector uc (alpha, beta) (k) of the inverter from the time k to the k+1 time according to the given value of the grid-connected current at k+1 time and the actual value of grid-connected current at k time and the feedback amount of a prediction deviation feedback unit; and the obtained voltage vector uc (alpha, beta) (k) is converted into a signal sabc to drive the power components of the grid-connected inverter. The prediction deviation feedback unit of the invention can realize self-adaptive correction when the system parameters do not match, and maintain good current tracking effect when the grid inductances and the resistances of the grid-connected inverter change due to sudden changes in load, temperature rise and the like, which improves the robustness when the grid-connected inverter parameters change.

Description

technical field [0001] The invention relates to a control method for a grid-connected inverter, in particular to an MPC method for a grid-connected inverter based on prediction deviation feedback correction. Background technique [0002] With the development of new energy such as photovoltaics and wind energy, distributed power generation systems have been widely used, and grid-connected inverters, as conversion devices for new energy to be integrated into the grid, have also received extensive attention and research. As a nonlinear control technology, model predictive control (MPC) plays an important role in the control method of grid-connected inverters due to its fast response speed, simple implementation method and direct processing method for defining the value function of the constraint conditions. . However, when the conventional MPC control method is actually used in the system, it is often affected by the mismatch of parameters, and the control performance deterior...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48H02J3/38
CPCH02J3/382H02M7/48H02M1/0012
Inventor 王颖杰王超刘海媛白飞莹许贺
Owner CHINA UNIV OF MINING & TECH
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