A control method for a non-isolated three-phase photovoltaic grid-connected inverter
A control method and non-isolated technology, which is applied in the direction of photovoltaic power generation, single-net parallel feeding arrangement, output power conversion device, etc., can solve the problem of affecting the grid-connected efficiency and power quality of photovoltaic inverters, complex space vector modulation methods, Unable to achieve constant common-mode voltage and other issues, to achieve the effect of high reliability, constant common-mode voltage, and leakage current suppression
Inactive Publication Date: 2017-01-18
YANSHAN UNIV
View PDF6 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Vazquez and others published an article "A photovoltaic three-phase topology to reduce common mode Voltage" at the ISIE2010 International Conference. The article proposed to reduce the common mode voltage by installing an auxiliary switch, but this circuit can only reduce the common mode voltage. Unable to achieve constant common-mode voltage
The literature "Eliminating Leakage Currents in Neutral Point Clamped Inverters for Photovoltaic Systems" proposes a three-phase diode-clamped multi-level photovoltaic grid-connected inverter space vector modulation method, which can achieve a constant system common-mode voltage, but its space vector modulation method is relatively It is complex, and at the same time, the circuit has the problem of bridge arm straight-through, the switch must be added to the dead zone, and the existence of the dead zone will cause grid-connected current distortion, affecting the grid-connected efficiency and power quality of the photovoltaic inverter
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0023] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
[0024] figure 2 Shown is a three-phase non-isolated photovoltaic grid-connected inverter of the present invention, which is composed of ten switch tubes, six diodes and nine inductors. The P of the DC bus 1 Terminal and seventh switch S 7 Collector connection, N of the DC bus 1 Terminal and eighth switch S 8 Emitter connection, eighth switch S 8 The collector of the second switch S 2 , The fourth switch S 4 , The sixth switch S 6 The emitter and the first diode D 1 , The third diode D 3 , The fifth diode D 5 Anode connection of DC busbar P 2 Terminal and ninth switch S 9 The collector connection, the ninth switch S 9 The emitter and the seventh switch S 7 Emitter connection, DC bus N 2 End and tenth switch S 10 Emitter connection, tenth switch S 10 The collector of the eighth switch S 8 The collector connection, the seventh switch S 7 The...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a non-isolated three-phase photovoltaic grid-connected inverter and a control method thereof. The inverter comprises ten switching tubes, six diodes and nine inductors. The non-isolated three-phase photovoltaic grid-connected inverter and the control method thereof have the beneficial effects that the problems caused by a straight bridge arm and a switch dead zone of traditional conventional three-phase non-isolated photovoltaic grid-connected inverter are solved; the problem of common mode voltage fluctuation of the inverter is solved; and leakage current of the photovoltaic grid-connected inverter is restrained effectively.
Description
Technical field [0001] The invention relates to a control method of a three-phase non-isolated photovoltaic grid-connected inverter. Background technique [0002] In order to solve the energy crisis and prevent environmental pollution, solar energy, as one of the clean energy sources, has attracted the attention of all countries in the world. Photovoltaic power generation technology is an important way to realize the effective use of solar energy. Photovoltaic power generation systems generally use inverters as the output interface to connect to the power grid. Traditional photovoltaic inverter systems use isolated topological structures to achieve voltage adjustment and electrical isolation through power frequency transformers or high frequency transformers. However, the power frequency isolation transformer has defects such as large weight, large volume, and expensive price. Although the high-frequency transformer reduces the volume and weight, the entire circuit structure is r...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/537H02J3/38
CPCY02E10/56
Inventor 郭小强魏宝泽
Owner YANSHAN UNIV