UPQC (unified power quality conditioner) based on SCR (silicon controlled rectifier) and energy storage

Abstract

The invention relates to a UPQC (unified power quality conditioner) based on an SCR (silicon controlled rectifier) and energy storage, and belongs to the power equipment technology field. The UPQC based on the SCR and the energy storage comprises super capacitive energy storage modules, bidirectional direct current-direct current converter modules, inverter modules and bidirectional SCR modules, wherein the super capacitive energy storage modules are connected with low voltage sides of the bidirectional direct current-direct current converter modules in parallel, high voltage sides of the bidirectional direct current-direct current converter modules are connected with direct current sides of the inverter modules in parallel, alternating current output ends of the inverter modules are connected in parallel between output ends of the bidirectional SCR modules and a load, and input ends of the bidirectional SCR modules are connected with a system power source. The UPQC based on the SCR and the energy storage enlarges a range for solving power energy quality problems, and simultaneously is further integrated, and effectively reduces cost. Furthermore, the UPQC based on the SCR and the energy storage not only has the advantages of being high in response speed, high in standby efficiency and stable in work, but also is simple in structure, convenient to maintain, easy to operate and high in cost performance, and effectively saves production cost.

Description

technical field [0001] The invention belongs to the technical field of electric power equipment, and in particular relates to a novel UPQC (unified power quality controller) based on thyristors and energy storage, which has the load-side voltage compensation function when the system power supply transient voltage fails, and the active filtering function. Power compensation function, three-phase unbalance compensation function, soft start function. Background technique [0002] With the improvement of my country's modern industrial technology and people's living standards, power quality problems have become increasingly prominent, and power quality control technology has become the key to solving power quality problems. At present, power quality problems mainly include system power supply voltage transient faults, harmonic pollution, low power factor, three-phase imbalance, etc. The corresponding solutions mainly include dynamic voltage restorer (DVR), active filter (APF), S...

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Problems solved by technology

[0003] However, with the continuous improvement of the power quality requirements of modern industrial production, new requirements are put forward especially on the transient power quality of the system power supply voltage, which includes short-term deep drops and short-term interruptions of the system power supply voltage. Based on the principle of series voltage compensation, it cannot meet the voltage compensation requirements of short-term deep voltage drops and interruptions. At the same time, UPQC does not have a bidirectional DC-DC conversion function, which makes it difficult to apply to related energy storage devices such as supercapacitors. And for power type Load traditional UPQC does not have soft start function

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