A Hybrid DC Power System Power Quality Conditioner

Abstract

The invention provides a hybrid power quality conditioner for a direct current power system. The hybrid power quality conditioner comprises a voltage and current signal acquisition unit, a controller, a parallel compensator, a series compensator and an energy storage unit, wherein the voltage and current signal acquisition unit is connected with the controller; the controller is connected with the parallel compensator, the series compensator and the energy storage unit respectively; and the parallel compensator and the series compensator are connected with the energy storage unit. The turning-on and turning-off of the parallel compensator and the series compensator are controlled by the controller respectively to regulate the electric power of the energy storage unit into compensation current or compensation voltage and injecting the compensation current or the compensation voltage into the direct current power system or transmit the electric power of the direct current power system to the energy storage unit, so that fluctuations during load switching are suppressed; the voltage of a direct current bus is stabilized; voltage and current harmonics are filtered; current is quickly injected when an open circuit failure occurs to support the load; fluctuations during loop switching processes are stabilized; maximum current is controlled; and loops are quickly cut off when a short-circuit failure occurs to fulfill the aim of conditioning the power quality of the direct current power system.

Description

technical field [0001] The invention belongs to the field of DC power systems, and in particular relates to a hybrid DC power system power quality regulator, which is used to realize the power quality regulation of the DC 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 limited by the stability of the pow...

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

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