LCL filter design method with comprehensive optimization of harmonic wave stability and damping loss
A filter design and stability technology, applied to AC networks to reduce harmonics/ripples, harmonic reduction devices, etc., can solve the problems of cumbersome design process, inconvenient application, and failure to consider the harmonic stability of grid-connected systems etc. to achieve low damping loss, ensure harmonic stability, and improve overall output power efficiency
Active Publication Date: 2019-06-07
FUZHOU UNIV
View PDF5 Cites 4 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
This method needs to repeatedly verify whether the selected parameters meet the restrictive conditions. If not, the value needs to be redesigned.
Therefore, the design process of this method is cumbersome, and the selected value is not necessarily the optimal solution, so it is very inconvenient to apply in actual engineering; another type of method is to optimize the target design with the minimum energy storage of the components or the total value of the inductance Filter parameters. Although this type of optimization design method achieves the optimal design of parameters in a certain performance, it does not consider the interaction of parameters in the entire inverter grid-connected system, does not introduce the concept of grid-connected common point resonance, and does not consider Harmonic Stability Problems of Grid-connected System
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
[0034] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0035] It should be pointed out that the following detailed description is exemplary and is intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
[0036] It should be noted that the terminology used here is only used to describe specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combi...
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 present invention relates to a LCL filter design method with comprehensive optimization of harmonic wave stability and damping loss. The method comprises the following steps of: the step S1: establishing a frequency domain model of an inverter being grid-connected through a LCL filter; the step S2: establishing a target function by taking reduction of damping loss as a target; and the step S3:performing optimizing for parameters of the filter by employing an improved cat swarm optimization to obtain a set of optimal parameters by taking the consideration of the harmonic stability of grid-connected points and by taking the damping loss as an optimization target. The LCL filter design method with comprehensive optimization of harmonic wave stability and damping loss ensures the harmonicstability of the new energy generation inverter grid-connected system.
Description
technical field [0001] The invention relates to the field of new energy grid-connected design, in particular to an LCL filter design method for comprehensively optimizing harmonic stability and damping loss. Background technique [0002] In the new energy grid-connected system, the output of the inverter will contain a large number of harmonics. Therefore, a filter is generally added between the inverter and the grid. The L-type filter can effectively suppress the harmonic current, but as the output power of the inverter increases, the value of the L-type inverter will be If the need is large, the overall cost of the filter will increase significantly. Compared with the L-type filter, the LCL filter has one more filter capacitor to shunt high-frequency harmonic components. Under the same filtering effect, the total inductance of the LCL filter is smaller than that of the L-type filter. However, the LCL filter has an inherent resonance point in the third-order resonance sys...
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 Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 邵振国王浩张嫣张逸黄新东
Owner FUZHOU UNIV