Magnetic integrated type hybrid power filter and reactive compensation system

Abstract

The invention discloses a magnetic integrated type hybrid power filter and reactive compensation system which comprises a five-winding transformer. A primary-side high-voltage winding of the five-winding transformer is connected with an alternating-current power network, a secondary-side low-voltage winding is connected with a current transformer, the current transformer is connected with a load, and two inductive filter windings of the five-winding transformer are connected with one filter capacitor bank. An active filter winding is connected with an active filter, a first current measurement device is arranged between the inductive filter windings and the filter capacitor bank, a second current measurement device is arranged between the secondary-side low-voltage winding and the transformer, the first current measurement device and the second current measurement device are respectively connected with an instruction current arithmetic unit, the instruction current arithmetic unit is connected with a PWM controller, and the PWM controller is connected with the active filter. The inductive filter and the active filter are combined, the magnetic integrated type hybrid power filter and reactive compensation system has the advantages of being high in integration degree, small in size, full in tuning and free of harmonic enlargement and achieves harmonic and reactive nearest dynamic continuous governance.

Description

technical field [0001] The invention relates to the field of harmonic control and reactive power compensation of distribution networks, in particular to a magnetically integrated hybrid power filter and reactive power compensation system. Background technique [0002] At present, the extensive use of power electronic devices in the distribution network inevitably produces power quality problems such as serious harmonic pollution of the system, low power factor, voltage flicker and imbalance. With the development of smart grid, electrical equipment is more sensitive to power quality, and higher requirements are put forward for the power supply quality of the grid. Harmonic control and reactive power compensation of the grid have become important research contents. [0003] At present, the main filtering technologies in improving power quality include passive filtering, active filtering and hybrid active filtering. Among them, passive filtering has been widely used in power s...

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Problems solved by technology

[0005] It is particularly worth pointing out that the above-mentioned filtering methods, whether they are passive filtering, active filtering or hybrid filtering, are mainly used to solve the adverse effects of harmonics and reactive components on the power grid, but for the power supply system connected to the power grid itself , no beneficial improvement

The harmonics and reactive components generated by nonlinear loads circulate freely in the power supply system without any suppression, which not only deteriorates the electromagnetic environment of the main equipment in the power supply system, but also increases the additional loss, vibration and noise of the main equipment, Moreover, the system stability and operating efficiency are reduced. In addition, the filter reactor in the passive filter and the isolation transformer in the active filter are independent, which makes the filter device bulky and consumes a lot of effective materials.

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