An MPC Method for Grid-connected Inverters Based on Prediction Deviation Feedback Correction
An inverter and deviation technology, which is applied in the field of grid-connected inverter MPC based on prediction deviation feedback correction, can solve the problems of grid-connected current distortion and aggravation, and achieve the goal of improving robustness, good current tracking effect, and reducing THD Effect
Active Publication Date: 2019-09-27
CHINA UNIV OF MINING & TECH
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[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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[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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The invention discloses a grid-connected inverter MPC method based on prediction deviation feedback correction, which adopts voltage outer loop control and current inner loop MPC control, and the phase-locked loop unit obtains the grid voltage vector angle θ to realize coordinate transformation; the voltage outer loop According to the DC side capacitor voltage of the PWM converter, output the given value of the grid-connected current. The current inner loop MPC control unit is based on the given value of the grid-connected current at time k+1, the actual value of the grid-connected current at time k and the feedback value of the forecast deviation feedback unit. , to get the voltage vector u of the inverter at the moment k to k+1 c(α,β) (k); will get the voltage vector u c(α,β) (k) Transformed into a signal s that drives the power device of the grid-connected inverter abc . The prediction deviation feedback unit of the present invention can realize self-adaptive correction when the system parameters do not match, and maintain a good current tracking effect when the grid-connected inductance and resistance change due to other reasons such as load mutation and temperature rise of the grid-connected inverter , which improves the robustness of grid-connected inverter parameters when changing.
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...
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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