Fully-controlled intelligent type electric energy quality correction apparatus and correction method applied to distribution network

Abstract

The invention discloses a fully-controlled intelligent type electric energy quality correction apparatus applied to a distribution network. The fully-controlled intelligent type electric energy quality correction apparatus comprises an active part, a passive part, a controller and a transformer, wherein the active part comprises a static var generator; the passive part comprises a thyristor switching capacitor and a capacitor adjusting and reinforcing apparatus; the transformer is mounted between a three-phase power grid and a load; the output end of the transformer is connected with the controller; the static var generator, thyristor switching capacitor and the capacitor adjusting and reinforcing apparatus are all connected to the three-phase power grid in parallel; and the controller is connected with the static var generator, thyristor switching capacitor and the capacitor adjusting and reinforcing apparatus separately. According to the correction apparatus, the electric energy quality problem is roughly compensated by the passive part, and then is accurately compensated by the active part, so that joint advantages of the active and passive technologies are played, thereby lowering the cost of the apparatus and improving the cost performance of the apparatus. The invention also discloses a fully-controlled intelligent type electric energy quality correction method applied to the distribution network.

Description

technical field [0001] The invention relates to the field of power quality control, in particular to a full-control intelligent power quality correction device and correction method applied to a distribution network. Background technique [0002] In the modern low-voltage distribution network, due to the diversity of loads, there are a series of power quality problems in the system, such as insufficient reactive power, three-phase imbalance and harmonic pollution. The modern SVG, which combines power electronic technology and control technology, can achieve high-precision compensation and treatment of reactive power, three-phase unbalance and harmonics in the distribution network system to a certain extent, and has a fast response speed, small size, and can Avoid resonance with the power system, but its cost is high; TSC is a reactive power compensation device that connects two anti-parallel thyristors in series with compensation capacitors, and compensates reactive power by...

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Problems solved by technology

The modern SVG, which combines power electronic technology and control technology, can achieve high-precision compensation and treatment of reactive power, three-phase unbalance and harmonics in the distribution network system to a certain extent, and has a fast response speed, small size, and can Avoid resonance with the power system, but its cost is high; TSC is a reactive power compensation device that connects two anti-parallel thyristors and compensation capacitors in series, and compensates reactive power by switching capacitors. The cost is low, but it can only Realize the graded regulation of reactive power, which cannot suppress flicker and unbalance; the capacitor adjustment and compensation part is to connect capacitors with different capacities between the phase lines, which are mainly used for balanced compensation of three-phase unbalanced loads, that is, active power balance and reactive power Compensation, but it can only achieve graded adjustment for three-phase unbalance, and it cannot meet the corresponding requirements in terms of accuracy

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