Research On Optimization Of On-line Energy Acquisition Of Transmission Lines

As an important part of the power system,high-voltage transmission lines play the role of transmitting and distributing electric energy,which is linked to the safe and stable operation of the power system.With the rapid development of smart grids,online monitoring equipment for transmission lines has become an indispensable part of the power system.However,due to the particularity of the location of the online monitoring device,the biggest difficulty existing in the online monitoring device is the power supply problem.This article first discusses the most commonly used energy extraction methods,and analyzes their respective advantages and disadvantages.Mainly aiming at the problems existing in the application of current transformers,the output characteristics of TA energy extraction are derived through theoretical derivation and simulation calculation.Through the analysis,the problem of excessively large range of the primary current measured in the energy acquisition process is explained,and the relationship between the maximum output power and the primary side current,the secondary side winding and the load resistance is obtained.In this paper,in the design of online energy acquisition device based on the current transformer,each structure and function of the online energy acquisition device are introduced.Use simulation software to model the online energy acquisition device to form a structure that can stably output electrical energy.This paper uses unique methods at both ends of the rectifier bridge(AC side and DC side)to solve the problem that the energy acquisition device cannot output electric energy stably.On the AC side,it is suggested to use a combination of a bidirectional thyristor and a bidirectional trigger to achieve adaptive stability.The effect on the output voltage.When the voltage across the load reaches the turn-on voltage of the bidirectional trigger tube,the bidirectional trigger tube and the bidirectional thyristor are turned on at the same time,and the secondary side of the current transformer will be short-circuited,thereby limiting the voltage across the load.The results of the joint simulation of Maxwell and Simpolor are utilized to verify the accuracy of the proposed method.In the part of the rectifier bridge and the DC side,it is therefore proposed to use pulse width modulation technology to achieve the effect of voltage stabilization.The pulse width modulation technology mainly utilizes signals and insulated gate bipolar transistors to change the operating state of the circuit.This article changes the size of the carrier according to the bus current.Achieving adaptive voltage stabilization effect.Considering the use of pulse width modulation technology to achieve the voltage stabilization effect requires a high-frequency modulation wave,and the higher the demand for high-frequency modulation waves on transistors,the introduction of a voltage quality function is used to determine the influence of the modulation wave frequency on the voltage quality.In order to solve the need for excessively high transistor frequency of the energy extraction device,the AC side voltage stabilization method is combined with the DC side voltage stabilization method,and fixed frequency and low frequency pulse signals are utilized to control control the transistor.When the energy extraction load voltage is too large,the transistor turn on,otherwise the transistor is turned off.Utilize Matlab/Simulink simulation software to verify the correctness of the above conjecture,and the load voltage will have no large-scale change under the bus current40-2000 A.Finally,through the analogy experiment,the coupling function is embedded in the single-chip microcomputer device,and the output signal of the single-chip microcomputer is utilized to control the operating state of the transistor.The experimental results are analyzed to obtain the accuracy of the proposed theory,which verifies the correctness of the simulation results;the energy circuit can discharge the excess electric energy on the basis of satisfying the voltage across the energy load to meet the energy demand.