LCL (Less Container Load) filter with serially-connected splitting capacitor and damping resistor and design method of LCL filter

A technology of damping resistors and split capacitors, used in electrical components, wind power generation, output power conversion devices, etc. The effect of machine efficiency

Active Publication Date: 2013-03-13
SHANGHAI JIAODA INTELLECTUAL PORPERTY MANAGEMENT CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The traditional passive damping control is to connect resistors in series with the filter capacitor branch of the LCL filter, so as to realize the resonance damping of the LCL filter, but the biggest defect of passive damping control is that the series damping resistor needs to consume a large amount of active power. It brings certain challenges to the heat dissipation design of the system, so for passive damping control, how to reduce the power loss of the damping resistor is a difficult problem

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  • LCL (Less Container Load) filter with serially-connected splitting capacitor and damping resistor and design method of LCL filter
  • LCL (Less Container Load) filter with serially-connected splitting capacitor and damping resistor and design method of LCL filter
  • LCL (Less Container Load) filter with serially-connected splitting capacitor and damping resistor and design method of LCL filter

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[0040] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0041] This design is to provide a damping solution for wind power grid-connected inverters. The selection method of damping resistance is as follows: figure 1 shown. This embodiment is aimed at the LCL filter of the split capacitor series damping resistor, such as image 3 As shown, the filter is a passive damping scheme capable of suppressing the resonance of the grid-connected LCL filter, which is mainly composed of the grid side reactor Lg, the first three-phase filter capacitor Cd1, the seco...

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Abstract

The invention provides an LCL (Less Container Load) filter with serially-connected splitting capacitor and damping resistor and a design method of the LCL filter which are applied to the technical field of wind power, wherein a grid side electric reactor and a grid-connected inverter side electric reactor are sequentially connected in series, and a first three-phase filter capacitor and a damping resistor are connected in series to a serial-connection node of the two electric reactors; a second three-phase filter capacitor is directly connected to the serial-connection node of the two electric reactors; a three-phase network source is connected to a Lg terminal of the grid side electric reactor; and a three-phase alternating current side of a wholly-controlled rectifier bridge of a grid-connected inverter is connected to terminals of the electric reactors. By using the LCL filter, the stability problem of a voltage type controllable inverter of the LCL filter is solved, the power consumption on the damping resistor can be effectively reduced, the overall efficiency of a grid-connected inverter system can be increased, and thus, the system heat radiation design pressure is relieved.

Description

technical field [0001] The invention relates to the technical field of wind power grid-connected converters, in particular to an LCL filter using a split capacitor connected in series with a damping resistor and a design method thereof. Background technique [0002] The three-phase voltage source type grid-connected inverter has the advantages of low harmonic content of output current, power factor adjustment and bidirectional energy flow, small size and light weight, so it is widely used in active filtering, traditional electric power and renewable energy such as solar energy and wind energy. It has been widely used in grid-connected power generation systems and other fields. [0003] The converter side of the three-phase voltage source grid-connected inverter controlled by PWM modulation technology will generate switching frequency and harmonic frequency current that is an integer multiple of the switching frequency. The harmonic current will pollute the grid voltage and s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/12
CPCY02E10/76
Inventor 王晗张建文
Owner SHANGHAI JIAODA INTELLECTUAL PORPERTY MANAGEMENT CO LTD
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