Circuit voltage-based comprehensive power quality management device and method

Abstract

The present invention relates to a circuit voltage-based comprehensive power quality management device and a method. Based on the calculation of the fundamental waves of a positive-sequence active current, a compensation target value formed through the superimposition of a harmonic current, a reactive current and a negative-sequence active current is directly obtained. Meanwhile, based on the control algorithm of a circuit voltage, a duty ratio outputted by PWM waves is directly calculated. The complex calculation process of the space vector algorithm and other algorithms is simplified. Meanwhile, the calculated duty ratio is adopted as a basis for the generation of a trigger pulse sequence. An insulated gate bipolar transistor (IGBT) drive circuit is arranged to control the on/off state of an IGBT transistor, so that the output of an inverter unit is controlled. The compensation of a target value is realized. The device and the method have the functions of eliminating the harmonic waves of a power grid, compensating the reactive power of the system, and balancing three-phase loads. Meanwhile, the common power quality problem of the power grid can be simultaneously and comprehensively solved. The power quality of the power grid is improved and the power grid is purified. The electricity environment of the power grid is optimized. The equipment operation reliability and the operation reliability of the power grid are improved.

Description

technical field [0001] The invention relates to a comprehensive power quality control device and method based on loop voltage, in particular to a control method based on a loop voltage control strategy that can perform comprehensive power quality control for power grid harmonics, reactive power, and active power imbalance. Background technique [0002] With the rapid development of society today, the use of electric energy is closely related to people's life. No matter in the civil or industrial fields, the consumption of electric energy is increasing year by year, so the quality of power supply and power consumption follows. Generally speaking, the quality of power supply and power consumption includes voltage, current steady-state and transient value deviation, degree of waveform distortion, flicker and other power supply and power consumption problems that affect electrical equipment. At present, with the large-scale, precision and energy-saving of electric loads, power ...

AI Technical Summary

Problems solved by technology

However, the three can only be managed in one aspect, and cannot comprehensively control and manage the three aspects, so they cannot play an all-round role in improving the quality of the power grid, and cannot optimize the power consumption environment of the equipment.

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