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T-type three-level inverter and midpoint balance control method thereof

A three-level inverter and balance control technology, applied in photovoltaic power generation, electrical components, circuit devices, etc., can solve problems such as inverter circuit leakage current, achieve stable DC bus voltage, suppress common-mode voltage, reduce The effect of small THD

Inactive Publication Date: 2016-05-04
XUJI GRP +3
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Problems solved by technology

[0004] The purpose of the present invention is to provide a T-type three-level inverter and its mid-point balance control method to solve the problem of inverter circuit leakage current

Method used

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  • T-type three-level inverter and midpoint balance control method thereof
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  • T-type three-level inverter and midpoint balance control method thereof

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Embodiment Construction

[0016] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0017] This embodiment is a three-level photovoltaic power generation system, and the inverter converts direct current into alternating current by controlling a closed-loop control strategy to realize the function of grid-connected power generation. The system adopts a three-level T-type topology structure, which can reduce the number of inverter components used, and at the same time, the efficiency of the T-type inverter is higher than that of the I-type three-level inverter.

[0018] As shown in 1, the connection points of the upper and lower bus capacitors on the DC side of the three-level inverter are shorted to the neutral line on the AC side. Because it is a non-isolated system, it is generally directly connected to the distribution network, using the connection method of three-phase four-wire + PE, and the N line is connected to the LCL filter capacito...

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Abstract

The invention relates to a T-type three-level inverter and a midpoint balance control method thereof. In the T-type three-level inverter, a connection point of an upper bus capacitor and a lower bus capacitor on a DC side of the three-level inverter is short-connected with a neutral line of an AC side. The midpoint balance control method of the T-type three-level inverter is based on DQ-axis decoupling control and is characterized by comprising the following steps of respectively comparing a d-axis control instruction, a q-axis control instruction and an o-axis control instruction with a corresponding feed link to generate an actual d-axis signal, a q-axis signal and an o-axis signal; carrying out dpo / abc conversion to carry out sinusoidal pulse width modulation (SPWM) regulation; and outputting an average value of the upper bus capacitor and the lower bus capacitor through proportion integral (PI) regulation as an o-axis current instruction. By the T-type three-level inverter and the midpoint balance control method thereof, the voltage of a DC bus can be stabilized, the total harmonic distortion (THD) of the grid-connected current is reduced, and the inverter is prevented from outputting a common-mode voltage.

Description

technical field [0001] The invention relates to a T-type three-level inverter and a midpoint balance control method thereof. Background technique [0002] With the increasing pressure on the global resource environment, energy conservation and emission reduction and resource conservation have become the trend of world economic development. Focusing on the development of green economy and strengthening energy conservation and emission reduction, we will accelerate the goal of building a resource-saving and environment-friendly society" As a widely used energy source, electric energy has penetrated into all aspects of industrial production, society and people's life. my country's power grid has low load rate, frequent power factor changes, and insufficient reactive power compensation capacity. With the development of photovoltaic industry With continuous development, three-level inverters have been widely used in high-voltage and high-power occasions due to their mature topology...

Claims

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Application Information

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IPC IPC(8): H02M7/483H02M1/12H02J3/38
CPCH02J3/383H02M1/12H02M7/483Y02E10/56
Inventor 芦开平梁燕李建伟郭寅远王青龙汪海涛
Owner XUJI GRP
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