In the power equipment of modern enterprises, most of the inductive loads are used, which makes the production process generate a large amount of reactive power. Because reactive power not only increases the line loss and equipment capacity of the power system, but also causes fluctuations in line voltage, so it has a serious impact on the power quality and power supply efficiency of the power supply network, and it also affects the user's electrical equipment and production quality. cause irreparable losses. In order to solve the negative impact caused by reactive power, reactive power compensation technology was born. This is a traditional power technology, which to some extent can represent a country's power level.
At present, most of the reactive power compensation devices in the power distribution system use capacitor bank and reactor bank group switching reactive power compensation, but this method has the disadvantages of slow compensation speed, large impact, poor compensation accuracy, serious under and over compensation, Ladder compensation, poor intelligence and other shortcomings, the average power factor after compensation is low, and in the face of rapidly changing reactive power loads, the response speed is not enough to meet the needs of normal work on site.
In recent years, although the new Static Var Generator (hereinafter referred to as SVG) has gradually entered the field of reactive power compensation, SVG is based on the principle of voltage-type inverter, SVG can quickly compensate for reactive power loads, and at the same time, it can reach a very high level. However, due to the limitations of technology, process and components, the cost of large-capacity SVG is very expensive, which limits the large-scale promotion of SVG.
Therefore, based on the current status of reactive power compensation, an intelligent Hybrid Reactive Power Compensation device scheme combining traditional switching capacitive reactance compensation and new SVG technology is proposed. This scheme learns from each other's strengths and weaknesses, not only adopts the latest power electronic technology, but also implements different reactive power compensation schemes according to the actual needs of on-site users, so as to achieve the best combination of price and effect. In terms of effect, the intelligent hybrid reactive power compensation device can meet the rapid reactive power change requirements of the system, and at the same time, the power factor of the system after compensation can reach more than 0.98, surpassing the group switching reactive power compensation of capacitor banks and reactor groups. There is no substantial increase in the cost of the device, making it possible for a wide range of applications.
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