A power-saving device for real-time improvement of power factor at the end of the power grid

Abstract

The invention discloses a power-saving device capable of improving a tail end power factor of a capacitance compensation cabinet. The power-saving device comprises a case and a power-saving device body, wherein the power-saving device body is arranged in the case and comprises an integrated control unit, a safety protection device, a bypass control unit, a sampling unit, a surge management device and a bypass switching control key, wherein the bypass switching control key is arranged outside the case and is used for manually switching a bypass / power-saving state. By the power-saving device, the reactive power required by a tail end of a power utilization device can be timely and accurately compensated, the response time is short, compensation can be provided according to demand on reactive power change required by the tail end, and an excessive compensation or under compensation phenomenon can be prevented.

Description

technical field [0001] The invention relates to the technical field of power-saving equipment, in particular to a power-saving device for improving the power factor at the end of a power grid in real time. Background technique [0002] At present, the capacitance compensation cabinet at this stage is usually installed in the voltage drop test operation of the transformer in the power distribution room, and generally it operates automatically under the control of power factor. The capacity of the capacitor and the number of capacitor banks are determined according to the different types of loads. However, at present, the capacitor cabinet can only be operated under the low voltage test of the transformer, and only the reactive power of the first stage is compensated, and the reactive power required at the end cannot be effectively compensated, and there is a hysteresis in the compensation, and the response time is too slow. The reactive power required at the end cannot be co...

AI Technical Summary

Problems solved by technology

However, at present, the capacitor cabinet can only be operated under the low voltage test of the transformer, and only the reactive power of the first stage is compensated, and the reactive power required at the end cannot be effectively compensated, and there is a hysteresis in the compensation, and the response time is too slow. The reactive power required at the end cannot be compensated in time. At the same time, the compensation of the capacitor cabinet has a stepwise nature. Since the compensation of the capacitor cabinet is in a stepped state, accurate compensation cannot be realized. It often happens that the power is over-compensated, and the power is not enough. Complementary phenomenon

Especially in the occasions where the harmonics are relatively serious, the use of capacitor cabinets for compensation will produce series or parallel resonance, amplify the harm of harmonics, and cause the capacitors in the capacitor cabinet to explode

Using capacitor cabinets for compensation, the head-end capacitor compensation has a certain hysteresis phenomenon, because the load of the terminal equipment is constantly changing, and the required reactive power is also different. Due to the hysteresis of the capacitor, the required reactive power cannot be accurately compensated. Therefore, the terminal power factor is low, which will increase the line loss in the line, reduce the output of the equipment, and increase the capacity of the electrical equipment; so a new type of power-saving device is needed in the market

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