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Control method of three-phase photovoltaic grid-tied inverter based on inverse system

A control method and inverter technology, applied in the direction of photovoltaic power generation, single-net parallel feeding arrangement, output power conversion device, etc., can solve the uncertainty of the global stability of the photovoltaic grid-connected system, affect the processing effect of the controller, Problems such as inaccurate system modeling can achieve the effects of reducing the influence of instability, facilitating control, and fast response

Inactive Publication Date: 2012-12-19
中船重工鹏力(南京)新能源科技有限公司
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Problems solved by technology

Although the fuzzy sliding film control it uses can be used in nonlinear systems, it can solve the problem of inaccurate system modeling caused by external disturbances and system internal parameter perturbations, and is more suitable for strongly nonlinear systems such as photovoltaic grid-connected , better robustness, stability, and dynamic response performance than the simple sliding film control; but there are also shortcomings, the system model is always in a nonlinear state, and the global stability of the photovoltaic grid-connected system is still uncertain. Frequent switching will bring more nonlinear factors to the system, which greatly affects the processing effect of the controller

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  • Control method of three-phase photovoltaic grid-tied inverter based on inverse system
  • Control method of three-phase photovoltaic grid-tied inverter based on inverse system
  • Control method of three-phase photovoltaic grid-tied inverter based on inverse system

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Embodiment Construction

[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0024] Such as figure 1 , figure 2 As shown, the present invention is a control method of a three-phase photovoltaic grid-connected inverter based on an inverse system, comprising the following steps:

[0025] Step 1. Detect the three-phase voltage u on the grid side a , u b , u c and three-phase current i a i b i c , respectively perform abc / dq transformation on the three-phase voltage and three-phase current to obtain the instantaneous active component i on the dq axis d , u d and instantaneous reactive component i q , u q , at the same time use the voltage sensor and current sensor to measure the DC side voltage u of the three-phase photovoltaic grid-connected inverter respectively dc and DC side current i g sampling;

[0026] Step 2. Apply the maximum power point tracking method to the DC side voltage and DC side current sampled in Step 1 to...

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Abstract

The invention discloses a control method of a three-phase photovoltaic grid-tied inverter based on an inverse system. A non-linear inverse system method is used for deducing an inverse system model of the three-phase photovoltaic grid-tied inverter to construct a pseudo-linear system; and the control method is used for carrying out decoupling control on active current, idle current and direct-current voltage, and realizes the control on active output and unit power factors of a power grid through the independent control on the active current and the idle current. The control method is high in control efficiency as well as simple and reliable and has a wide application range.

Description

technical field [0001] The invention belongs to the field of photovoltaic power generation system control, in particular to a control method for a three-phase photovoltaic grid-connected inverter based on an inverse system. Background technique [0002] In the power electronic conversion device, the three-phase photovoltaic grid-connected inverter can feed back electric energy to the grid. It has the advantages of stable DC voltage, sinusoidal output current, and bidirectional flow of energy. It is used in the utilization of renewable energy such as solar energy and wind energy. be widely used. [0003] In order to achieve excellent control performance, many control methods have been proposed, including indirect current control, direct current control, and direct power control. Due to the strongly coupled nonlinear characteristics of the three-phase photovoltaic grid-connected inverter itself, most control methods rely on approximately linear models or linear controllers wi...

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Application Information

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IPC IPC(8): H02J3/38H02M7/5387
CPCY02E10/563Y02E10/56
Inventor 徐进孙善勤刘婉丽刘伟
Owner 中船重工鹏力(南京)新能源科技有限公司
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