A refined primary harmonic elimination device and control method based on temperature control

Abstract

The invention discloses a refined primary harmonic elimination device based on temperature control, which includes an infrared thermometer, a controller, and a harmonic eliminator, and the infrared thermometer, the controller, and the harmonic eliminator are connected in sequence, wherein the harmonic eliminator includes Sub-resonance eliminator I, sub-resonance eliminator II, sub-resonance eliminator III, control switch I, control switch II, sub-resonance eliminator I, sub-resonance eliminator II, and sub-resonance eliminator III are connected in series to N line and ground in sequence Between the lines, the control switch I is connected in parallel with the sub-resonance eliminator II, the control switch II is connected in parallel with the sub-resonance eliminator III, and the controller is respectively connected with the control switch I and the control switch II; this device is suitable for primary resonance elimination of voltage transformers, Taking into account the capacity expansion of the resonance eliminator brought about by the substation and line capacity, the use of linear high-resistance resistors instead of nonlinear resistors for resonance elimination, and the use of temperature to achieve fine control can improve the scalability and reliability of the primary resonance eliminator. And avoid the non-linear influence on the system when the non-linear resistor eliminates the harmonic.

Description

Technical field [0001] The present invention belongs to the field of electricity technology, and more particularly to a refined primary console device and a control method based on temperature control. Background technique [0002] In the neutral point inactivation system, the voltage transformer mounted on the substation bus side is the only neutral point connection point, and due to the nonlinearity of the voltage transformer Pt primary side, the nonlinearity is shorted, resulting in a single phase shortage, The circuit breaker is closed, and when ferromagnetic resonance occurs, the voltage transformer will produce overvoltage, overcurrent, and can be kept self-maintained. If over current, the voltage transformer is burned. [0003] Nonlinear resistance can be applied directly to the N wire and ground wires on the primary side of the voltage transformer Pt to increase the function of increasing the damping energy. The variable power plant and the line transformation, the system...

AI Technical Summary

Problems solved by technology

With the transformation of substations and lines, the capacity of the system changes, and the system continues to run for 1-2 hours when a single-phase fault occurs in the neutral point ungrounded system, which is likely to cause damage to the primary resonance eliminator, and the nonlinearity of the nonlinear resistance has a negative impact on the power grid. The impact on operation is difficult to predict, and the limitations of the existing extensive use of non-linear resistance resonance eliminators are becoming more and more prominent

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