Magnetic balanced harmonic elimination reactive compensation device and method

Abstract

The invention belongs to the field of an intelligent power device and a control device, in particular relates to a magnetic balanced harmonic elimination reactive compensation device and a method. According to the device and the method, three-phase unbalanced data of a circuit is acquired by a detector and is also stored and processed, the state of a load diverter switch on a load circuit is controlled so as to control access states of two branches connected with the detector, wherein one branch is provided with a magnetic balanced harmonic elimination device, the detector controls the load diverter switch to have access to the magnetic balanced harmonic elimination device according to power quality on a detection circuit of the detector when an exception occurs, and the original branch is cut off so as to perform magnetic balanced harmonic elimination. The method and the device have the following advantages that: 1, power supply quality is timely and accurately detected to reach economic operation, and operation loss of the original electromagnetic balanced power saver is effectively reduced; 2, switching in and switching out are convenient so as to guarantee power supply; 3, no-load loss can be effectively reduced; and 4, the device and the method are applicable for a place where a load condition is complicated and harmonic wave of a power grid is high, and power supply reliability is increased.

Description

technical field [0001] The invention provides a magnetic balance harmonic elimination reactive power compensation device and method, belonging to the field of intelligent power equipment and control equipment. Background technique [0002] Power system loads, especially living quarters, hospitals, schools, office buildings, and discontinuously operating factories and mines, undergo repeated peak-valley-peak changes every day, and a large amount of electricity is wasted during holidays. [0003] Severe power grid pollution and unbalanced three-phase voltage power supply aggravate the loss of electric energy and make users suffer. The main reasons for the above problems are: grid pollution mainly based on harmonics, part of the high-order harmonics in the power supply is generated by the mains, and the other part is caused by low-voltage electrical and electronic equipment, such as the use of inverter power-saving technology, Effective power saving is only performed on a sing...

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Problems solved by technology

[0003] Severe power grid pollution and unbalanced three-phase voltage power supply aggravate the loss of electric energy and make users suffer

The main reasons for the above problems are: grid pollution mainly based on harmonics, part of the high-order harmonics in the power supply is generated by the mains, and the other part is caused by low-voltage electrical and electronic equipment, such as the use of inverter power-saving technology, Effective power saving is only performed on a single device, but a large number of harmonics will be generated during its work, polluting the power grid

Harmonics not only cause waste of electric energy, but also cause overheating of the transformer due to the increase of eddy current and loss, overheating of the motor and decrease of torque, and also cause overheating of the capacitor in the low-voltage capacitor cabinet and increase of the neutral line current.

[0004] In low-voltage lines, due to the influence of single-phase and high-order harmonics, the three-phase load is unbalanced, causing a series of hazards: affecting the safe and economical operation of transformers and motors, causing power supply and distribution network phase and zero line power Increased loss; affects the normal operation of the computer, shortens the life of the lighting lamp (too high voltage) or low illumination (too low voltage) and damage to the TV, etc.; interferes with the communication system and affects the normal communication quality

[0005] In the existing three-phase electromagnetic balance and harmonic elimination technology, most of them are directly connected to the harmonic elimination transformer, which has the disadvantage of high initial investment cost

Due to the continuous online operation, the initial investment is huge, and the harmonic elimination transformer itself has the problem of power consumption

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