Power quality regulator for series direct current power system

Abstract

The invention provides a power quality regulator for a series direct current power system. The power quality regulator comprises a bidirectional direct current / direct current (DC / DC) converter, a direct current energy storage unit, a filtering unit, a voltage and current signal acquisition unit and a controller, wherein the voltage and current signal acquisition unit is connected with the controller which is connected with the bidirectional DC / DC converter and the energy storage unit respectively; and the bidirectional DC / DC converter is connected with the filtering unit and the energy storage unit respectively. A switching device of the bidirectional DC / DC converter is controlled by the controller to be turned on and off to regulate direct current electric energy output by the direct current energy storage unit into proper compensation voltage for output to the direct current power system or to transmit the redundant direct current electric energy of the direct current power system to the energy storage unit, so that the bus voltage of the direct current power system is stabilized and smoothened, maximum passing current of a series loop is controlled, and the loop is quickly switched off under a short-current failure condition to fulfill the aim of regulating the power quality of the direct current power system.

Description

technical field [0001] The invention belongs to the field of direct current power systems, and in particular relates to a series type direct current system power quality regulator, which is used to realize the power quality adjustment of the direct current power system. Background technique [0002] With the development of the power system, the shortcomings and limitations of the AC power system have become increasingly prominent. In the AC transmission line, in addition to the resistance loss of the wire, there is also the loss of the AC inductance, the line loss is large, and the long-distance transmission efficiency is low. In the AC transmission line, if any phase has a permanent fault, the whole line must be cut off, and the loss of the fault will be large. AC power transmission must run synchronously, and phase consistency must also be considered for grid-connected AC systems, which complicates control. In the AC distribution network, the AC transmission capacity is ...

AI Technical Summary

Problems solved by technology

However, the current power quality control devices are all designed for AC power systems, and there are few researches and inventions on power quality conditioners for DC power systems.

Once the DC power system is put into use, similar power quality problems will inevitably be encountered, and the existing power quality regulation technologies and devices are basically unable to meet the requirements of the DC power system

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