Photovoltaic grid-connected inverter resonance suppression method based on model predictive control

A technology of model predictive control and resonance suppression, applied in photovoltaic power generation, AC network to reduce harmonics/ripple, AC network circuit, etc. It can solve the problem of low-quality power entering the grid and affecting the stability of grid-connected inverters, etc. problems, to achieve good control, improve the quality of the grid-connected power, and achieve the effect of resonance suppression

Pending Publication Date: 2021-05-28
SANJIANG UNIVERSITY
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Problems solved by technology

[0003] In order to suppress the harmonics in the grid-connected current of photovoltaic grid-connected inverters, LCL filters are often used, but they also have resonance problems, which will inevitably lead to low-quality electric energy entering the grid, affecting the stability of grid-connected inverters. Therefore, certain resonance suppression methods must be adopted

Method used

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  • Photovoltaic grid-connected inverter resonance suppression method based on model predictive control
  • Photovoltaic grid-connected inverter resonance suppression method based on model predictive control
  • Photovoltaic grid-connected inverter resonance suppression method based on model predictive control

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Embodiment 1

[0132] Based on MATLAB / Simulink, this example builds figure 1 The system simulation model of the photovoltaic grid-connected inverter is shown, and the control method adopts finite set model predictive control. The grid-connected control target of Example 1 is that the three-phase grid-connected current is sinusoidal and balanced, and the specific parameters are shown in Table 1 below. In this example, the inverter side current i is given 1 * =10A. The simulation results of Example 1 are as follows Figure 11 shown, Figure 11 (a)~(b) are the simulation results of grid current and grid current FFT analysis, respectively. Figure 11 It can be seen that the MPC-i of the PV grid-connected inverter based on model predictive control 1 u cf_f The resonance suppression strategy can suppress the resonance in the LCL system, and the three-phase grid current is sinusoidal and balanced, which achieves the control objective.

[0133] Table 1 Simulation parameters

[0134] ...

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Abstract

The invention relates to a photovoltaic grid-connected inverter resonance suppression method based on model predictive control. The method comprises the following steps: carrying out Clark conversion on sampling values of three-phase inverter side current and three-phase capacitor voltage; enabling the three-phase capacitor voltage after Clark conversion to pass through a second-order generalized integrator SOGI module to obtain a capacitor voltage fundamental frequency component; and establishing a prediction model , sending the inverter side current, the inverter side current reference value and the capacitor voltage fundamental frequency component to the prediction model, and obtaining the optimal switching state through prediction and calculation according to the prediction model so as to achieve resonance suppression. According to the invention, resonance suppression can be carried out on the LCL-type photovoltaic grid-connected inverter so as to improve the quality of network-accessed electric energy.

Description

technical field [0001] The invention relates to the technical field of DC-AC converters of electric energy conversion devices, in particular to a method for suppressing resonance of photovoltaic grid-connected inverters based on model predictive control. Background technique [0002] The working state of the photovoltaic grid-connected inverter has a great impact on the power quality entering the grid, and it plays the role of an energy conversion interface in a distributed grid-connected power generation system. At present, the control methods for photovoltaic grid-connected inverters such as PI control, PR control, and hysteresis control are relatively mature. [0003] In order to suppress the harmonics in the grid-connected PV inverter grid current, LCL filters are often used, but they also have resonance problems, which will inevitably lead to low-quality power entering the grid and affect the stability of grid-connected inverters. Therefore, certain resonance suppressi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/01H02M1/12
CPCH02J3/01H02J3/381H02M1/126H02J2300/24Y02E10/56Y02E40/40
Inventor 吴馥云丁金勇吕建国陈海霞陆朱卫
Owner SANJIANG UNIVERSITY
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