High-voltage switchgear passive power supply automatic impedance matching device, method and power supply circuit

Abstract

The invention belongs to the field of high-voltage switchgear power supply, and provides a high-voltage switchgear passive power supply automatic impedance matching device, method and power supply circuit. Among them, the high-voltage switchgear passive power supply automatic impedance matching device includes an impedance matching network, which is connected to the radio frequency energy receiving antenna; a control module, which is used to solve the objective function by using the optimal value calculation method based on step size control, and obtain the impedance matching network The optimal parameters are sent to the latch module; the objective function is the objective function based on the parasitic model, which is constructed according to the load impedance value, the input voltage and the output voltage of the impedance matching network; the load impedance value is based on the output voltage of the impedance matching network and The current is calculated; the latch module is used to latch the optimal parameters of the impedance matching network output by the control module and send them to the impedance matching network so that the impedance matching network can be adjusted to the optimal parameters.

Description

technical field [0001] The invention belongs to the field of high-voltage switchgear power supply, in particular to a high-voltage switchgear passive power supply automatic impedance matching device, method and power supply circuit. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] As an important electrical equipment for receiving and distributing electric energy in the power system, the high-voltage switchgear will have a serious impact on the stable operation of the power grid, economic production and life once an operation failure occurs. The operation experience shows that the high temperature of the internal equipment of the switchgear and partial discharge are the main reasons for the failure of the high-voltage switchgear, so it is very necessary to carry out the temperature and partial discharge detection of the high-voltage switchg...

AI Technical Summary

Problems solved by technology

[0004] At present, the temperature and partial discharge detection of high-voltage switchgear mostly adopts the method of manual inspection. This method is not only time-consuming, laborious and inefficient, but also cannot detect potential faults of high-voltage switchgear in time. In addition, the power system has been continuously developed and transformed in recent years. , the number of high-voltage switchgears connected to the network has expanded rapidly, which has further increased the difficulty of detecting the temperature and partial discharge of high-voltage switchgears

At present, the most effective and reliable method is to establish an on-line monitoring system for the temperature and partial discharge of high-voltage switchgear. Battery-powered sensors cannot be used, so if you want to establish an online monitoring system for temperature and partial discharge in high-voltage switchgear, you must first solve the power supply problem for temperature and partial discharge sensors

Although there have been cases where radio frequency energy harvesting technology has been successfully applied to the temperature monitoring system of high-voltage switchgear, the inventors found that there are still problems of low radio frequency energy utilization and high energy consumption of the system

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