A method for setting apf switching frequency
A switching frequency and switching tube technology, applied in the field of APF switching frequency setting, can solve the problems of switching frequency device loss, excessive switching frequency threshold, etc., to reduce the total loss of the device, meet the filtering requirements, and take into account the filtering effect and work efficiency. Effect
Active Publication Date: 2021-11-16
江苏平易电气有限公司
View PDF1 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] The technical problem to be solved by the present invention is to provide a method for setting the switching frequency of APF, which can solve the problem of excessive switching frequency threshold in the loss of general devices and the influence of grid side inductance on filtering, and unnecessary device loss caused by excessive switching frequency
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
[0018] The following examples can enable those skilled in the art to understand the present invention more comprehensively, but the present invention is not limited to the scope of the described examples.
[0019] Such as Figure 1 to Figure 4 A method for setting the switching frequency of the APF is shown, and the specific method is as follows:
[0020] S1: Using an inverter-based grid impedance online detection method to calculate the grid equivalent reactance Lg at the APF access node;
[0021] S2: According to the calculated grid equivalent impedance Lg and the LCL filter circuit on the APF side, calculate the minimum switching frequency f1 under the premise of meeting the filtering requirements;
[0022] S3: Measure the switching frequency corresponding to the minimum total loss of the device under different powers, and obtain the optimal switching frequency approach line of device efficiency;
[0023] S4: According to the optimal switching frequency approach line of d...
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 relates to a method for setting the switching frequency of an APF, which is characterized in that: by measuring the equivalent reactance Lg of the power grid at the APF access node, the minimum switching frequency f1 corresponding to the filtering requirements of the filter circuit is accurately calculated, and the working frequency of the device is measured. The corresponding switching frequency f2 when the total loss of the device is the lowest under different power conditions, and the larger value of f1 and f2 is taken as the switching frequency f of the switching tube, and finally f is the switching frequency that makes the total loss of the device the lowest under the premise of meeting the filtering requirements The present invention considers the influence of the grid reactance on the filter effect of the filter circuit and the relationship between the total loss of the device and the switching frequency under different powers, takes into account the filter effect and work efficiency, and reduces the total loss of the device on the premise of meeting the filtering requirements.
Description
technical field [0001] The invention relates to the field of active power filters, in particular to a method for setting an APF switching frequency. Background technique [0002] The switching tube such as IGBT is one of the core energy conversion devices in the APF, and its working loss often plays a decisive role in the efficiency, performance, reliability and cost of the whole machine. In practical applications, the loss of the switching tube is mainly determined by factors such as the temperature of the PN junction, the bus voltage, the current flowing through the switching tube, and the switching frequency. At present, the APF field mostly adopts the control method of adjusting the pulse width at a fixed frequency. The method usually selects a fixed switching frequency under the premise of meeting the junction temperature requirements, and then designs an LCL filter circuit according to the selected switching frequency and filtering requirements. This approach takes in...
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): H02J3/01
CPCH02J3/01Y02E40/20
Inventor 蔡鹏蔡翔徐先明
Owner 江苏平易电气有限公司