Maximum power tracking system and method of power transmission line induction power supply source

Abstract

The invention provides a maximum power tracking system and a maximum power tracking method of a power transmission line induction power supply source. The method comprises the following steps of: detecting output voltage of a power supply coil and rectifying and amplifying the output voltage to obtain first output voltage; detecting output voltage of a measuring coil and performing rectification, amplification and phase-shift processing on the output voltage to obtain a reference voltage; outputting a drive control signal according to a comparison result of the two voltages; and switching on or off a switch tube by using the drive control signal to correspondingly select a battery or the power supply coil for supplying power for a load. By using the system and the method, the output voltage of the power supply coil can be adjusted by changing the duty ratio size of a gate drive signal of the switch tube to track the reference voltage all the time, thereby dynamically adjusting the output power of the power supply coil. In addition, when the power supply source and a backup battery are used for simultaneously supplying power, the time for supplying power for the load by the battery can be shortened to the greatest extent since the power supply coil works at the maximum power point for the most of time, so that the design life of the entire power supply source is prolonged.

Description

technical field [0001] The invention relates to an induction power acquisition technology of a high-voltage transmission line, in particular to a maximum power tracking system and method for an induction power acquisition power supply of a transmission line. Background technique [0002] The power supply problem of monitoring equipment on the high-voltage side of the power system is the prerequisite for the reliable operation of all monitoring equipment, and it is also one of the key technologies to be broken through in the construction of smart grids. For example, photoelectric current transformers, transmission line temperature measuring equipment, high-voltage circuit breaker busbar temperature measuring equipment, etc. directly measure the high-voltage side information, and then transmit the collected information to the low-voltage side through optical fiber or wireless network, which greatly simplifies the insulation requirements, and Improve the accuracy of the acquisi...

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Problems solved by technology

[0003] The application number is 200410061314.9, and the title of the invention is the patent document of induction power collection device for overhead high-voltage transmission lines. It uses the principle of current transformer to obtain electric energy from high-voltage transmission lines, but the technical solution in this document does not give the transmission line load. The effective output power of the current in its entire working range, especially the output power when the transmission line is no-load. In addition, when the load current of the transmission line is large, the induction power-taking device will heat up seriously

The application number is 200820066665.2, and the invention name is the patent document of high-voltage line induction power-taking device, which also uses the transformer principle to take power from the transmission line. The index given is that the output power when the load current of the transmission line is 80A-300A is 20-110W, but when the transmission line is no-load, the wire current is only about 40A, and the output power of the power-taking device at this time is not given, and as the current on the transmission line increases, the power-taking device will also become more and more hot serious

In addition, the backup power in the above two patents is a lithium battery, and the lithium battery is not suitable for long-term work on the field transmission line due to its lifespan and operating temperature.

The application number is 200910309627.4, and the name of the invention is a high-voltage transmission line CT power pick-up device based on power control method, which can output stable power in a large current range. However, the lower limit current of all the above-mentioned studies and patent documents is tens of amperes, and the no-load current of the distribution line may only be a few amperes. At this time, the general solution is to start the power supply Under the current, the battery is directly used for power supply, but the battery life is limited, and frequent use will shorten the design life of the entire power supply

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