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A photovoltaic grid-connected inverter control method based on predictive control

A technology of predictive control and inverter control, applied in photovoltaic power generation, single-network parallel feeding arrangement, output power conversion device, etc., can solve problems such as system oscillation and control quality degradation, and achieve simplified application and easy handling of constraints Effect

Inactive Publication Date: 2021-06-08
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

The control algorithm and structure of direct power control are relatively simple, robust, and have the characteristics of high PFC and low THD. However, when the grid voltage has harmonics, distortion or three-phase imbalance, its control quality will be reduced. Causes system oscillation in severe cases

Method used

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  • A photovoltaic grid-connected inverter control method based on predictive control
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  • A photovoltaic grid-connected inverter control method based on predictive control

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Embodiment Construction

[0051] The implementation will be described in detail below in conjunction with the accompanying drawings.

[0052] The present invention proposes a method for controlling the output current of a photovoltaic grid-connected inverter based on predictive control, and the specific implementation steps are as follows:

[0053] Step 1: Establish the mathematical model of the photovoltaic grid-connected inverter in the three-phase abc static coordinate system;

[0054] The photovoltaic grid-connected inverter is composed of power switch tubes, filter inductors and other components, and its topology is shown in Figure 1.

[0055] Step 1 includes the following sub-steps:

[0056] Sub-step A1: Establish the mathematical model expression of the DC side of the photovoltaic grid-connected inverter as:

[0057] v a = S a V dc -V ON

[0058] v b = S b V dc -V ON

[0059] v c = S c V dc -V ON

[0060] Among them, v a , v b , v c are the output voltages of each phase of th...

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Abstract

The invention belongs to the technical field of new energy control and application, and in particular relates to a photovoltaic grid-connected inverter control method based on predictive control. Establish the mathematical model of photovoltaic grid-connected inverter. Based on the predictive control method, the photovoltaic grid-connected inverter controller is designed step by step, and the objective function is constructed to make the predicted value of the inverter output current track the current reference as much as possible. The common-mode voltage suppression item is added to suppress the common-mode voltage generated by the grid-connected inverter to ensure the reliable operation of the photovoltaic grid-connected inverter system. By optimizing the objective function, the switching signal of the grid-connected inverter is obtained, and the switching state of the grid-connected inverter is directly controlled, so that the output direct current of the photovoltaic system is converted into alternating current with the same frequency and phase as the grid voltage.

Description

technical field [0001] The invention belongs to the technical field of new energy control and application, and in particular relates to a photovoltaic grid-connected inverter control method based on predictive control. Background technique [0002] With the rapid development of science and technology, new energy is developing more and more rapidly. For a long period of time in the future, all kinds of new energy power generation will usher in a period of large-scale development. In recent years, due to the shortage of resources and the deterioration of the environment, light energy, as one of the main clean and renewable energy sources, has attracted more and more attention and favor. The development of foreign photovoltaic industry and the promulgation of domestic advantageous policies have enabled the rapid development of photovoltaic power generation in my country. So far, there have been a large number of companies producing photovoltaic grid-connected power generation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/40H02M7/5387H02M7/493
CPCY02B10/10Y02E10/56
Inventor 马苗苗任石佳
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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