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Parallel-form power quality conditioner for direct current power system

A power system and power quality technology, applied in the parallel operation of DC power supplies, DC circuits can reduce harmonics/ripples, electrical components, etc., can solve few DC power systems, research and invention of power quality regulators, power quality Adjustment technology and devices cannot adapt to the requirements of the DC power system, etc., to reduce the loss of open circuit faults, prevent further expansion, and stabilize fluctuations

Inactive Publication Date: 2015-01-28
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 will basically not be able to meet the requirements of the DC power system

Method used

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  • Parallel-form power quality conditioner for direct current power system
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  • Parallel-form power quality conditioner for direct current power system

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Embodiment Construction

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The structures in the figures are all open and not limited to the structures drawn in the figures.

[0032] A parallel DC power system power quality regulator provided by the present invention has a schematic diagram of its circuit structure as shown in figure 1 As shown, it includes: DC / DC bidirectional converter, DC energy storage unit, filter unit, voltage and current signal acquisition unit and controller; the voltage and current signal acquisition unit is connected to the controller, and the controller is respectively connected to the DC / DC bidirectional converter and storage The energy unit, and the DC / DC bidirectional converter are respectively connected to the filter unit and the energy storage unit. More specifically, the DC / DC bidirectional converter is connected to the filter unit through two DC ports c and d, and the DC / DC bidirectional...

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Abstract

The invention provides a parallel-form power quality conditioner for a direct current power system. The parallel-form power quality conditioner comprises a direct current / direct current (DC / DC) bidirectional 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; the controller is connected with the DC / DC bidirectional converter and the energy storage unit respectively; the DC / DC bidirectional converter is connected with the filtering unit and the energy storage unit respectively; and the filtering unit is connected in parallel with a direct current bus. The turning-on and turning-off of the DC / DC bidirectional converter are controlled by the controller to regulate direct current electric power output by the direct current energy storage unit into proper compensation current and output the compensation current to the direct current power system or transmit the residual direct current electric power of the direct current power system to the energy storage unit, so that fluctuations caused by the use and removal of an impact load are suppressed; the current harmonics of the direct current power system are filtered; current is quickly injected when an open circuit failure occurs to temporarily support the load; and the load is stably transferred in mutual loop switching processes, and the fluctuations of the mutual loop switching processes are stabilized to condition 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 parallel type direct current power 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 capa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J1/10H02J1/02H02J9/06
Inventor 陆继明韦甜柳王丹毛承雄
Owner HUAZHONG UNIV OF SCI & TECH
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