Method for controlling parallel power quality regulator through non-harmonic detection

Abstract

The invention relates to a method for controlling a parallel power quality regulator through non-harmonic detection. A main circuit is only composed of a three-phase LCL filter and a three-phase IGBT inverter bridge and is connected to the output end of a three-phase power grid. The three-phase IGBT inverter bridge is composed of a three-phase IGBT bridge and a direct current side capacitor. Harmonics, negative sequences and unbalance of load currents do not need to be detected through a complex detection algorithm, only the load currents need to be sampled, active current components in the load currents are offset through direct current side voltage stabilizing commands, and then harmonic, negative sequence and unbalance current commands are acquired. The complex detection algorithm is omitted, errors and time delay caused by the detection algorithm are avoided, and the dynamic response speed is increased; meanwhile, resources of a control chip are saved, and economical efficiency is improved. Compared with an existing active power filter, an existing static var generator and an existing static synchronous compensator, the parallel power quality regulator has certain advantages, certain practical value and certain application prospect.

Description

technical field [0001] The invention relates to a power quality technology, in particular to a control method for a parallel power quality regulator without harmonic detection. Background technique [0002] The static weight torque standard device uses the gravity of the weight as the standard force value, and directly or after being amplified by a certain lever mechanism, the standard torque is generated through the action of the lever arm. For high-precision small-torque standard devices, small sound waves, air flow, and ground vibrations will affect their measurement accuracy. Therefore, how to prevent the external environment from affecting it is a necessary condition for realizing high precision. This patent provides a realizable anti-vibration technology for solving the above problems. Different from the commonly used anti-vibration ditch design in the past, this patented design can more effectively and comprehensively prevent vibration problems caused by tiny sound ...

AI Technical Summary

Problems solved by technology

[0003] The present invention is aimed at the problem that harmonic and reactive power detection algorithms are complex and cause errors, and proposes a control method for a parallel power quality regulator without harmonic detection. The present invention does not need to detect harmonics, eliminating the need for The complex detection algorithm avoids the error and delay caused by the detection algorithm, improves the dynamic response speed, saves the resources of the control chip at the same time, and improves the economy

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