A Method for Calculating the Steady-state Performance of a Wireless Power Transfer System Using Single-Port Impedance Measurements
A wireless energy transmission and impedance measurement technology, applied in the field of electric power engineering, can solve the problems of strong human factors, impossible, high cost, etc., and achieve the effect of avoiding the influence of human factors
Inactive Publication Date: 2018-07-06
DALIAN UNIV OF TECH +1
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Problems solved by technology
On the one hand, these performance indicators can be obtained by establishing a WPT system model with the help of theoretical calculations, but the complexity of the model and the choice of secondary factors will directly affect the calculation results, and it is related to the analyst's experience, and the human factor is strong; on the other hand On the one hand, it can also be obtained by real measurement of the actual system, but this is dangerous, expensive, and even impossible, such as measuring short-circuit current and maximum power
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[0017] The specific implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and the technical solution.
[0018] 1. Establish a two-port network
[0019] The basic units that make up the WPT system are abstracted into different two-port networks, such as figure 1 shown. Figure 2(a) and (b) are examples of energy coupling units used in WPT systems, image 3 It is an example of impedance compensation unit for WPT system.
[0020] Cascade the two-port networks corresponding to each basic unit to obtain a composite two-port network N for measurement, such as Figure 4 shown.
[0021] During actual work, a high-frequency transmitting power supply is connected between transmitting ports 1 and 1'. When measuring the steady-state performance of the WPT system, an impedance analyzer is connected between 1 and 1', or it is open or short-circuited.
[0022] During actual work, a rectification circuit is connected betwe...
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The invention provides a method of using a single port impedance measurement value to measure and calculate wireless power transmission system steady state performance and belongs to the electric power engineering field. The method comprises two steps of measurement and calculation. During a measurement process, a WPT system is simplified into a two-port network, one of the ports is in an open circuit or short circuit state, a common impedance analyzer is used to measure an equivalent impedance of another port, and the impedance is called as a single port impedance. According to measurement values of the single port impedances, a calculating formula provided in the invention is used to measure and calculate main steady state performance of the WPT system. The measuring and calculating method in the invention is different from theory calculating and actual measurement and only the common impedance analyzer is needed. When the impedance analyzer is used to measure, the WPT system does not need to be in a working state and live line measurement can be avoided. The method is simultaneously suitable for magnetic field coupling type, electric field coupling type and ultrasonic coupling type WPT systems and is unrelated to an impedance compensation network form.
Description
technical field [0001] The invention relates to the wireless transmission of electric energy between electric equipment and a grid, and belongs to the technical field of electric power engineering. Background technique [0002] Wireless power transmission (WPT for short) technology, due to the important research progress made by MIT scholars in 2007 and people's expectations for its bright application prospects, has set off a new research boom in power transmission technology. With the help of WPT technology, electric energy can be transmitted without wire connection, which is expected to solve the connection problem between electrical equipment and power supply in special occasions. WPT technology shows a bright application prospect in electromechanical products such as electric vehicles, portable electronic devices, household appliances, transportation equipment, robots, wireless sensors, etc., which can make power supply more convenient; In explosion and other environmen...
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IPC IPC(8): G06F17/00
CPCG01R31/00
Inventor 陈希有周宇翔李冠林牟宪民孙学斌
Owner DALIAN UNIV OF TECH