Apparatus and method for comprehensively controlling electric energy quality

Abstract

The invention discloses an apparatus and method for comprehensively controlling electric energy quality. Current target compensation tasks are determined according to acquired power grid parameters of a low-voltage power grid, and four corresponding pulse control signals are generated according to the current target compensation tasks to respectively control a first IGBT inversion module, a second IGBT inversion module, a third IGBT inversion module and a high-frequency stepless voltage regulating module to conduct static reactive compensation, active filtering, three-phase unbalance current compensation and stepless voltage compensation. Static reactive compensation, active filtering, three-phase unbalance current compensation and stepless voltage compensation can be conducted simultaneously, the compensation contents are comprehensive, and control effects on a low-voltage power grid are good. IGBT inversion modules are employed to conduct reactive compensation, active filtering and three-phase unbalance current compensation, the size and loss are small, the cost is low, the response speed is fast, and the real-time and dynamic performance is good. Compared with other electric and electronic devices, the IGBT inversion modules are full-control type electric and electronic devices and have higher control precision.

Description

technical field [0001] The invention relates to the technical field of low-voltage power grid quality management, in particular to a power quality comprehensive control device and method thereof. Background technique [0002] With the further deepening of the construction of a new socialist countryside, power quality has increasingly received great attention and attention from power supply companies and power users. The power quality problems in the rural low-voltage power grid are mainly reflected in the following aspects: [0003] Insufficient reactive power compensation. With the economic development in rural areas, more and more farmers have agricultural machinery and equipment, such as electric welding machines, reactors, rectifiers, etc., which not only consume large active power, but also consume a large amount of reactive power. [0004] The three phases are unbalanced. In the three-phase four-wire rural low-voltage distribution network, most of the users are sing...

AI Technical Summary

Problems solved by technology

However, installing a power quality control device on the secondary side of the transformer or at the end of the line usually only solves a certain power quality problem, and the traditional reactive power compensation capacitor and filter reactor are used to make the entire power quality control device The volume is usually relatively large, the cost is high, the life is limited, and the adjustment accuracy is poor

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