A control method and system for a grid-connected inverter
A control method and control system technology, applied in the field of converters, can solve problems such as poor quality and vibration of grid-connected inverters, and achieve the effect of improving quality and avoiding vibration
Active Publication Date: 2020-06-23
ALTENERGY POWER SYST
View PDF6 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
It can be seen that in the presence of reactive power, the actual output current i of the grid-connected inverter out Oscillation phenomenon exists, poor quality
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
[0050] The core of the present invention is to provide a control method and system for a grid-connected inverter, which reduces or even avoids the oscillation of the output current, and improves the quality of the output current of the grid-connected inverter.
[0051] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0052] Please refer to Figure 4 , Figure 4 A flow chart of a control method f...
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 control method and a system, comprising the steps of determining a phase difference between an output current of a grid-connected inverter required by a user and a grid voltage; Each half cycle of the reference current, the reference current is read as follows to obtain the reference current: determining the reference current lagging behind the phase difference at the zero-crossing point of the reference current as the reading start point in the current half cycle; Reading the reference current from the reading start point until the reference current crosses the zeropoint, and then reading the reference current backwards from the reading start point until the reference current crosses the zero point; A control signal is generated according to the reference current while the reference current is obtained and sent to the grid-connected inverter to realize the control of the grid-connected inverter. The invention reduces or even avoids the oscillation of the output current, and improves the quality of the output current of the grid-connected inverter.
Description
technical field [0001] The invention relates to the technical field of converters, in particular to a control method and system for a grid-connected inverter. Background technique [0002] With the development of power electronics technology, inverters are being used more and more. In some fields such as the new energy field, an inverter is used to convert the DC power output by a DC power module (such as a solar panel) into an AC power and output it to the power grid. [0003] Specifically, please refer to figure 1 , figure 1 It is a structural schematic diagram of a common new energy system in the prior art. The new energy system includes a DC power supply module, a grid-connected inverter, a filter module and a control module; Fig. 2(a) is a pure active power Under the condition of grid-connected inverter output current and grid-connected voltage; Figure 2(b) is a schematic diagram of the reference current of grid-connected inverter under the condition of pure active p...
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): H02J3/38H02M7/5387H02J3/01
CPCH02J3/01H02J3/381H02M7/53871Y02E40/40
Inventor 罗宇浩祁飚杰
Owner ALTENERGY POWER SYST